Product Overview
PNP Silicon Small-Signal Transistor in a Three-Lead Metal Can, 20 V, 300 mA
Condition
Unused new old stock (NOS). Sold each. Markings legible: Motorola batwing logo, 2N1991.
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Product Overview
Motorola 2N1991 is a PNP silicon small-signal bipolar transistor in a metal can with three leads and a small tab on the rim. The number is obsolete.
Key Features
- Type: PNP bipolar junction transistor, silicon
- Collector-emitter voltage (VCEO): 20 V
- Collector current (IC): 300 mA
- Power dissipation (PD): 600 mW
- DC current gain (hFE): 15 minimum
- Transition frequency (fT): 40 MHz
- Package: metal can, three leads plus a tab on the rim
Applications
- Replacing a failed 2N1991 on a board whose parts list calls for that exact number.
- Keeping a restoration original where the owner wants the Motorola-marked metal can back on the board.
- The PNP side of low-power switching and driver stages within the published 20 V and 600 mW limits.
Frequently Asked Questions
Is the 2N1991 PNP or NPN?
PNP, silicon.
Can I use it on a 24 V supply?
Only where the transistor never sees more than 20 V from collector to emitter. That is its VCEO rating, and a 24 V rail can put the full supply across it when it switches off.
A PNP is the mirror image of the more common NPN, its emitter on the positive side and every current running the other way. An NPN dropped into a 2N1991 position will not do the job, so check the polarity on the parts list before the number.
