Product Overview
Vintage Motorola 3-Amp Axial Silicon Power Rectifier for Classic Power Supplies
Condition
New old stock (NOS). Unused vintage component with full-length straight leads. Marked with the magenta Motorola emblem and partial MR10 designation.
Ships same or next business day from our Idaho warehouse. Honest pricing, no nonsense.
Online since 1999. Here for our customers, with a satisfaction guarantee that means what it says.
Product Overview
The Motorola MR1031A (JEDEC 1N4720) is a 3-amp, 100-volt silicon power rectifier housed in a hermetically sealed Case 60 top-hat metal package. Engineered for dependable DC power rectification, it handles standard power conversion and surge suppression tasks in legacy electronics.
Key Features
- 100V peak repetitive reverse voltage (VRRM) and DC blocking voltage
- 3.0A maximum average forward rectified current
- 300A peak forward surge current capability (1/2 cycle, 60 Hz)
- 1.0V maximum forward voltage drop at 3.0A
- Hermetically sealed Motorola Case 60 top-hat metal body with axial leads
- Wide operating junction temperature range from -65°C to +175°C
Applications
- Restoring vintage linear DC power supplies and classic audio amplifiers requiring original top-hat components.
- Servicing legacy industrial power supplies and test gear where hermetic metal rectifiers were factory specified.
- Custom maker builds and retro radio bench projects that need rugged 3-amp rectification with authentic period appearance.
Frequently Asked Questions
Is the MR1031A interchangeable with the 1N4720?
Yes. The Motorola MR1031A is the manufacturer type number for the JEDEC 1N4720 standard power rectifier diode, carrying identical electrical ratings.
Which lead is the cathode on this top-hat package?
The metal can top-hat body connects directly to the cathode lead, following standard JEDEC axial top-hat diode polarity.
Why buy an individual vintage rectifier instead of an untested surplus assortment?
Purchasing an individually inspected, authenticated component ensures you get the exact part needed with full-length leads and clear markings, avoiding the waste and uncertainty of bulk grab bags. Shipping is an $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Before molded epoxy took over every circuit board, metal-can rectifiers took the heat and carried the current without complaint. Slide this top-hat into your chassis and keep that vintage supply running the way it was built.
