Product Overview
Motorola 1N2984B 20V 10W DO-4 Silicon Voltage Regulator Diode on Heatsink Bracket
Condition
Used. Pulled from equipment. Intact DO-4 hermetic metal case with green glass seal, hex nut, lock washer, solder lug, and attached lead wire segments. Markings read 1N2984B and 10M20Z5 with Motorola logo. Evaluation: Visual inspection only. Function testing not performed.
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Product Overview
Motorola 1N2984B (internal code 10M20Z5) is a heavy-duty 10-watt silicon Zener voltage regulator diode housed in a hermetic DO-4 stud-mount package. Rated for a nominal 20-volt breakdown with a ±5% tolerance, this unit is mounted to a sturdy aluminum L-bracket that acts as a dedicated heat sink. Standard polarity configuration places the cathode at the threaded stud and the anode at the top wire terminal. Designed for robust voltage clamping, transient suppression, and regulation in legacy industrial power circuits and custom bench builds.
Key Features
- Nominal Zener breakdown voltage of 20 V with ±5% tolerance rating
- 10 W continuous power dissipation capacity
- Hermetic DO-4 (DO-203AA) metal package with 7/16-inch hex base
- Standard polarity design with stud cathode and top terminal anode
- Mounted to pre-drilled aluminum L-bracket heatsink with securing nut and lock washer
- Includes attached terminal solder lug for chassis or wiring harness connection
Applications
- Stabilizes 20-volt rails in legacy linear power supplies and industrial control chassis
- Replaces failed DO-4 stud-mount Zeners in vintage broadcast gear and test equipment
- Serves as a rugged overvoltage clamp for DIY linear bench power supplies and ham radio rigs
- Provides a high-dissipation reference node in custom electronics and prototype builds
Frequently Asked Questions
What is the polarity of this stud-mount diode?
This is a standard polarity diode. The cathode connects to the threaded stud base, while the anode is the top feedthrough terminal with the green glass seal.
What mounting hardware is included with the diode?
The diode comes installed directly on the aluminum L-bracket heatsink, secured by its original 7/16-inch hex nut, lock washer, and terminal solder lug as shown.
Why choose this specific assembled pull over unverified surplus lots?
This unit provides a verified, clearly marked Motorola 1N2984B already fastened to a rigid aluminum mounting bracket, removing the guesswork of sourcing matched hardware or heatsinks for an urgent repair. For orders needing multiple units, more pieces cost less each, and the price-break table on this page shows what each quantity costs. Orders ship for an $8 flat rate, qualify for free shipping at $28 or more, and leave our Idaho warehouse the same or next business day.
Solid-state iron from the golden age of American semiconductors, when twenty volts meant twenty volts and a heat sink was built like an engine mount. Bolt it into the chassis, solder the lead, and put heavy vintage silicon back to work.
