Product Overview
7.5 Volt 5 Watt Silicon Zener Diode - Motorola Surmetic 40 Axial Lead
Condition
Unused new old stock (NOS). Clean axial leads with intact cathode polarity band. Body markings are legible: 1N5343 with A suffix and Motorola logo. Sold each.
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Product Overview
The 1N5343A is a 5-watt silicon Zener voltage regulator diode designed for DC voltage regulation, transient protection, and reference clamping circuits. Built in Motorola's Surmetic 40 (Case 17-02) molded axial package, it provides a nominal 7.5V breakdown voltage with a ±10% tolerance rating.
Key Features
- Nominal Zener voltage: 7.5 V at 175 mA test current
- Power dissipation: 5.0 W
- Voltage tolerance: ±10% (A suffix)
- Maximum dynamic impedance: 1.5 Ω at 175 mA
- Maximum reverse leakage current: 10 µA at 5.4 V
- Package style: Surmetic 40 / Case 17-02 molded axial body
- Polarity: Color band marks the cathode terminal
Applications
- Bench power supply voltage regulation and rail overvoltage clamping
- Linear regulator reference stages and bias stabilization networks
- Vintage audio gear maintenance and electronic repair work
Frequently Asked Questions
Which terminal does the painted body band indicate?
The color band designates the cathode terminal. In standard Zener regulator setups, the cathode is connected toward the positive side of the circuit.
What is the difference between the 1N5343 and 1N5343A?
The standard 1N5343 carries a ±20% voltage tolerance, while the 1N5343A specifies a tighter ±10% tolerance around the nominal 7.5V rating.
A solid 5-watt zener from the era when Motorola molded their Surmetics to handle real heat without flinching. Drop it across your rail and let it clamp down exactly where it should.
