How to tell if a BJT is PNP or NPN by looking at the circuit?What's the difference between NPN and PNP...
In mixed effect models, how account for grouped random effects?
Line of Bones to Travel and Conform to Curve (Like Train on a Track, Snake...)
When do I have to declare that I want to twin my spell?
Does Skippy chunky peanut butter contain trans fat?
How much mayhem could I cause as a sentient fish?
If I delete my router's history can my ISP still provide it to my parents?
Picture with grey box as background
How do I draw the dashed lines as shown in this figure
Graph with overlapping labels
What is the data structure of $@ in shell?
Why do neural networks need so many training examples to perform?
How do you funnel food off a cutting board?
Why exactly do action photographers need high fps burst cameras?
False written accusations not made public - is there law to cover this?
"on its way" vs. "in its way"
Which communication protocol is used in AdLib sound card?
What sets the resolution of an analog resistive sensor?
Avoid page break between paragraphs
Why do cars have plastic shrouds over the engine?
Why was Lupin comfortable with saying Voldemort's name?
How would an AI self awareness kill switch work?
ST_Buffer in PostGIS produces different results for the same set of lines
Is it possible to grant users sftp access without shell access? If yes, how is it implemented?
What is the proper way to reproach a rav?
How to tell if a BJT is PNP or NPN by looking at the circuit?
What's the difference between NPN and PNP transistors?Using an NPN vs a PNP transistorWhy are the current directions in the hybrid-$pi$ model for BJT the same for both NPN and PNP?Help with NPN and PNP common emitterApplying hybrid-pi model of an npn-BJT to a pnp BJT in small signal analysisWhat's the differences of these usage of PNP, NPN transistors?PNP and NPN Collector Emitter namingBJT NPN current flowHow do I implement a DPDT-switch here using NPN/PNP instead?PNP BJT small signal model
$begingroup$
Is it possible to tell if a BJT circuit is PNP or NPN simply by looking at the circuit?
For example, for the circuits shown, how can we tell if they're PNP or NPN?
bjt
New contributor
$endgroup$
add a comment |
$begingroup$
Is it possible to tell if a BJT circuit is PNP or NPN simply by looking at the circuit?
For example, for the circuits shown, how can we tell if they're PNP or NPN?
bjt
New contributor
$endgroup$
$begingroup$
Yes. Look at the location/direction of the arrow. That is really a question for your textbook or a search engine.
$endgroup$
– Eugene Sh.
1 hour ago
3
$begingroup$
I'm voting to close this question as off-topic because there is no evidence of effort to research this answer at all.
$endgroup$
– Andy aka
1 hour ago
$begingroup$
A memory aid: emmiter arrow on an NPN is Not Pointing iN
$endgroup$
– Peter Bennett
1 hour ago
$begingroup$
Another memory aid that has stuck with me for a while: PNP is Pointing iNward Proudly
$endgroup$
– Andrey Akhmetov
30 mins ago
add a comment |
$begingroup$
Is it possible to tell if a BJT circuit is PNP or NPN simply by looking at the circuit?
For example, for the circuits shown, how can we tell if they're PNP or NPN?
bjt
New contributor
$endgroup$
Is it possible to tell if a BJT circuit is PNP or NPN simply by looking at the circuit?
For example, for the circuits shown, how can we tell if they're PNP or NPN?
bjt
bjt
New contributor
New contributor
New contributor
asked 1 hour ago
Jimmy VailerJimmy Vailer
355
355
New contributor
New contributor
$begingroup$
Yes. Look at the location/direction of the arrow. That is really a question for your textbook or a search engine.
$endgroup$
– Eugene Sh.
1 hour ago
3
$begingroup$
I'm voting to close this question as off-topic because there is no evidence of effort to research this answer at all.
$endgroup$
– Andy aka
1 hour ago
$begingroup$
A memory aid: emmiter arrow on an NPN is Not Pointing iN
$endgroup$
– Peter Bennett
1 hour ago
$begingroup$
Another memory aid that has stuck with me for a while: PNP is Pointing iNward Proudly
$endgroup$
– Andrey Akhmetov
30 mins ago
add a comment |
$begingroup$
Yes. Look at the location/direction of the arrow. That is really a question for your textbook or a search engine.
$endgroup$
– Eugene Sh.
1 hour ago
3
$begingroup$
I'm voting to close this question as off-topic because there is no evidence of effort to research this answer at all.
$endgroup$
– Andy aka
1 hour ago
$begingroup$
A memory aid: emmiter arrow on an NPN is Not Pointing iN
$endgroup$
– Peter Bennett
1 hour ago
$begingroup$
Another memory aid that has stuck with me for a while: PNP is Pointing iNward Proudly
$endgroup$
– Andrey Akhmetov
30 mins ago
$begingroup$
Yes. Look at the location/direction of the arrow. That is really a question for your textbook or a search engine.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
Yes. Look at the location/direction of the arrow. That is really a question for your textbook or a search engine.
$endgroup$
– Eugene Sh.
1 hour ago
3
3
$begingroup$
I'm voting to close this question as off-topic because there is no evidence of effort to research this answer at all.
$endgroup$
– Andy aka
1 hour ago
$begingroup$
I'm voting to close this question as off-topic because there is no evidence of effort to research this answer at all.
$endgroup$
– Andy aka
1 hour ago
$begingroup$
A memory aid: emmiter arrow on an NPN is Not Pointing iN
$endgroup$
– Peter Bennett
1 hour ago
$begingroup$
A memory aid: emmiter arrow on an NPN is Not Pointing iN
$endgroup$
– Peter Bennett
1 hour ago
$begingroup$
Another memory aid that has stuck with me for a while: PNP is Pointing iNward Proudly
$endgroup$
– Andrey Akhmetov
30 mins ago
$begingroup$
Another memory aid that has stuck with me for a while: PNP is Pointing iNward Proudly
$endgroup$
– Andrey Akhmetov
30 mins ago
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
Quite simply, look at the arrow on the leg.
The arrow will always be on the emitter. Look at where the current flows. The arrow will always follow the current flow.
When the arrow is pointing away from the base, it is an NPN. When pointing towards the base, it is a PNP.
$endgroup$
add a comment |
$begingroup$
If the arrow points towards the base it is a PNP, if it points away from the base it is an NPN.
Further, the arrow will typically be on the more positive leg for PNP and negative for NPN.
$endgroup$
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
|
show 2 more comments
$begingroup$
This diagram should explain everything
Any additional questions?
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
});
});
}, "mathjax-editing");
StackExchange.ifUsing("editor", function () {
return StackExchange.using("schematics", function () {
StackExchange.schematics.init();
});
}, "cicuitlab");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "135"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Jimmy Vailer is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f424702%2fhow-to-tell-if-a-bjt-is-pnp-or-npn-by-looking-at-the-circuit%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Quite simply, look at the arrow on the leg.
The arrow will always be on the emitter. Look at where the current flows. The arrow will always follow the current flow.
When the arrow is pointing away from the base, it is an NPN. When pointing towards the base, it is a PNP.
$endgroup$
add a comment |
$begingroup$
Quite simply, look at the arrow on the leg.
The arrow will always be on the emitter. Look at where the current flows. The arrow will always follow the current flow.
When the arrow is pointing away from the base, it is an NPN. When pointing towards the base, it is a PNP.
$endgroup$
add a comment |
$begingroup$
Quite simply, look at the arrow on the leg.
The arrow will always be on the emitter. Look at where the current flows. The arrow will always follow the current flow.
When the arrow is pointing away from the base, it is an NPN. When pointing towards the base, it is a PNP.
$endgroup$
Quite simply, look at the arrow on the leg.
The arrow will always be on the emitter. Look at where the current flows. The arrow will always follow the current flow.
When the arrow is pointing away from the base, it is an NPN. When pointing towards the base, it is a PNP.
answered 1 hour ago
MCGMCG
6,33631747
6,33631747
add a comment |
add a comment |
$begingroup$
If the arrow points towards the base it is a PNP, if it points away from the base it is an NPN.
Further, the arrow will typically be on the more positive leg for PNP and negative for NPN.
$endgroup$
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
|
show 2 more comments
$begingroup$
If the arrow points towards the base it is a PNP, if it points away from the base it is an NPN.
Further, the arrow will typically be on the more positive leg for PNP and negative for NPN.
$endgroup$
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
|
show 2 more comments
$begingroup$
If the arrow points towards the base it is a PNP, if it points away from the base it is an NPN.
Further, the arrow will typically be on the more positive leg for PNP and negative for NPN.
$endgroup$
If the arrow points towards the base it is a PNP, if it points away from the base it is an NPN.
Further, the arrow will typically be on the more positive leg for PNP and negative for NPN.
edited 1 hour ago
answered 1 hour ago
evildemonicevildemonic
2,233720
2,233720
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
|
show 2 more comments
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
Thank you. So would those all be PNP?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
No. Look carefully.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
All but one....
$endgroup$
– evildemonic
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
Oh so c) (the first one) would be NPN because the arrow above the current source is pointing away?
$endgroup$
– Jimmy Vailer
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
$begingroup$
No. Look at the direction of the arrow with respect to the BASE of the transistor.
$endgroup$
– evildemonic
1 hour ago
|
show 2 more comments
$begingroup$
This diagram should explain everything
Any additional questions?
$endgroup$
add a comment |
$begingroup$
This diagram should explain everything
Any additional questions?
$endgroup$
add a comment |
$begingroup$
This diagram should explain everything
Any additional questions?
$endgroup$
This diagram should explain everything
Any additional questions?
answered 1 hour ago
G36G36
5,3901511
5,3901511
add a comment |
add a comment |
Jimmy Vailer is a new contributor. Be nice, and check out our Code of Conduct.
Jimmy Vailer is a new contributor. Be nice, and check out our Code of Conduct.
Jimmy Vailer is a new contributor. Be nice, and check out our Code of Conduct.
Jimmy Vailer is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Electrical Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f424702%2fhow-to-tell-if-a-bjt-is-pnp-or-npn-by-looking-at-the-circuit%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
$begingroup$
Yes. Look at the location/direction of the arrow. That is really a question for your textbook or a search engine.
$endgroup$
– Eugene Sh.
1 hour ago
3
$begingroup$
I'm voting to close this question as off-topic because there is no evidence of effort to research this answer at all.
$endgroup$
– Andy aka
1 hour ago
$begingroup$
A memory aid: emmiter arrow on an NPN is Not Pointing iN
$endgroup$
– Peter Bennett
1 hour ago
$begingroup$
Another memory aid that has stuck with me for a while: PNP is Pointing iNward Proudly
$endgroup$
– Andrey Akhmetov
30 mins ago