Product Overview
Motorola 2N4921 Medium-Power Silicon BJT - Gold Leads and Tab - TO-126 NOS
Condition
Unused new old stock (NOS). Individual transistors feature gold-plated leads and a gold-plated rear mounting tab, sealed in clear plastic packaging. Body markings legible: Motorola logo, date code 339, and 2N4921.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
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Product Overview
Motorola 2N4921 is a medium-power NPN silicon bipolar junction transistor housed in the compact Case 77 (TO-126 / TO-225AA) plastic package. Built for driver, medium-power amplifier, and general-purpose switching applications, this transistor is rated for 40V collector-emitter breakdown voltage, 1.0A continuous collector current, and 30W total power dissipation at 25°C case temperature. The gold-plated through-hole leads and gold-plated collector heatsink tab provide reliable conductivity and corrosion resistance in sensitive or high-reliability electronic assemblies.
Key Features
- Transistor polarity: NPN silicon medium-power transistor
- Package style: TO-126 (Motorola Case 77 / TO-225AA) with center mounting screw hole
- Contact finish: Gold-plated leads and gold-plated copper mounting tab
- Collector-emitter voltage (VCEO): 40 V continuous
- Collector-base voltage (VCBO): 40 V
- Emitter-base voltage (VEBO): 5.0 V
- Continuous collector current (IC): 1.0 A (3.0 A peak)
- Total power dissipation (PD): 30 W at 25°C case temperature
- DC current gain (hFE): 20 to 100 at IC = 0.5 A
- Transition frequency (fT): 3.0 MHz minimum
Applications
- Audio output stages, driver circuits, and small linear regulator rebuilds
- Relay, solenoid, and indicator lamp driver switching on industrial control boards
- Vintage test equipment and analog synth bench repair requiring authentic Motorola silicon
- Maker electronics bench projects needing a durable 1A through-hole NPN driver
Frequently Asked Questions
What is the pinout configuration for the Motorola 2N4921 in TO-126?
Looking at the front marked face of the transistor with the leads pointing downward, the pinout follows the standard Motorola Case 77 configuration: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base. The rear metal mounting tab is electrically connected to Pin 2 (Collector).
Are these authentic Motorola parts or modern reproductions?
These are genuine unused vintage Motorola production units marked with the stylized Motorola logo, date code 339, and part number 2N4921, featuring factory gold plating on both the leads and the rear mounting tab.
Why buy individual Motorola 2N4921 transistors here rather than bulk surplus lots?
Sourcing vintage active components individually lets you replace a failed driver or complete a dedicated repair without purchasing dozens of untested parts or risking modern counterfeit silicon. Each component is genuine Motorola vintage stock with verified gold leads and clear markings. Orders ship at an $8 flat rate, ship free once your order totals $28 or more, and leave our Idaho warehouse the same or next business day.
Gold leads, an honest copper tab, and authentic Motorola silicon from the golden era of solid-state circuit design. Drop it into your repair bench and get that driver stage running exactly as intended.
