Product Overview
Motorola 1N4737A 7.5V 1 Watt DO-41 Axial Glass Zener Diode
Condition
Unused new old stock (NOS). Clean axial leads with intact factory body finish. Cylindrical glass body bears the Motorola emblem and cathode polarity band. Sold individually.
Ships same or next business day from our Idaho warehouse. Honest pricing, no nonsense.
Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Built for steady shunt regulation, the Motorola 1N4737A delivers 1.0 watt of power dissipation in a hermetic DO-41 axial glass package. Operating at a nominal 7.5-volt breakdown with 5% tolerance at 34 mA, this through-hole diode clamps voltage spikes and stabilizes reference rails in analog circuitry, power supplies, and test gear.
Key Features
- Nominal Zener Voltage (Vz): 7.5 V at 34 mA test current
- Power Dissipation (Pd): 1.0 Watt
- Voltage Tolerance: ±5% (A suffix)
- Maximum Zener Impedance (Zzt): 4.0 Ω at 34 mA
- Maximum Reverse Leakage (Ir): 10 µA at 5.0 V
- Package: DO-41 (DO-204AL) axial leaded glass
- Polarity: Distinct cathode band on body
Applications
- Restoring regulated bias rails in vintage audio gear and communications equipment
- Breadboarding analog signal clamping and gate-protection stages
- Serving as a stable 7.5V reference in discrete bench supplies and battery testers
Frequently Asked Questions
Which lead connects to the positive side for zener regulation?
In normal zener shunt regulation, the cathode operates at the higher positive potential. The cathode is indicated by the printed dark band on the glass body.
What package outline does this diode use?
It uses the standard DO-41 hermetic axial glass package, measuring roughly 4 mm in body length with long through-hole leads suitable for point-to-point wiring or standard PCB pitch.
Can this diode substitute for an un-suffixed 1N4737?
Yes. The standard 1N4737 carries a 10% tolerance, whereas the 1N4737A carries a tighter 5% tolerance, making it a direct functional upgrade in existing 7.5V regulator sockets.
Solid Motorola silicon from an era when standard axial glass formed the backbone of every clean analog rail. Solder it across the rail and let it do what it was built to do.
