Product Overview
NPN Silicon Medium-Power Transistor, 40 V 1 A 30 W, TO-126 / TO-225 Case 77
Condition
Unused new old stock (NOS). Sold each. Markings legible: 2N 4921.
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Product Overview
Motorola 2N4921, a JEDEC-registered NPN silicon medium-power transistor in the plastic TO-126 / TO-225 package (Case 77), with the collector tied to the metal mounting tab. It is rated 40 V collector-emitter, 1 A continuous collector current and 30 W with the case held at 25 C. Production of the 2N4921 has been discontinued by its current maker.
Key Features
- Polarity: NPN silicon
- Package: TO-126 / TO-225, Case 77, through-hole, three leads, mounting hole through the tab
- Voltage: VCEO 40 V, VCB 40 V, VEB 5.0 V
- Collector current: 1.0 A continuous, 3.0 A peak
- Power dissipation: 30 W at a 25 C case temperature
- DC current gain (VCE 1.0 V): 40 to 150 at 50 mA, 30 minimum at 500 mA, 10 minimum at 1.0 A; fT 3.0 MHz minimum
- Pinout: 1 emitter, 2 collector (common with the tab), 3 base
Applications
- Replacing a 2N4921 in the driver or output stage of vintage audio, instrument or test gear
- Switching relay coils, solenoids and lamps within the 1 A continuous rating
- Pass element or current sink in a bench linear supply or electronic load, bolted to a heatsink
Frequently Asked Questions
What is the PNP complement to the 2N4921?
The 2N4920. One of each forms a complementary push-pull pair.
A plastic body this size reaches its power rating only through the tab, bolted to real metal. Left loose on the board, it is a much smaller transistor.
