1N4747A-TAP

Overview

The Vishay 1N4747A-TAP is a silicon planar power Zener diode in the DO-41 (DO-204AL) axial package. It provides a nominal Zener voltage of 20 V with a standard tolerance of ±5%. The device operates at a test current of 12.5 mA and dissipates up to 1300 mW under thermal equilibrium conditions. Key electrical parameters include a maximum reverse leakage current of 5 µA, a dynamic resistance of 22 Ω, and a forward voltage of 1.2 V at 200 mA. It supports a junction temperature up to 175 °C.

Feature Summary

• Utilizes silicon planar technology for robust voltage regulation
• Designed for high-power stabilization and clipping applications
• Features glass passivation for environmental protection

Applications

• Voltage stabilization circuits
• High-power clipping circuits

Procurement Notes

Verify the specific ordering code suffix against the manufacturer's documentation to confirm packaging details. The TAP designation indicates an ammopack configuration containing 5000 units per pack. Ensure compliance with RoHS standards and material categorization requirements as defined by the supplier before finalizing procurement specifications.

Selection Notes

Select this component when a 20 V reference with ±5% accuracy is required in through-hole designs. Evaluate the 1300 mW power dissipation capability relative to ambient temperatures using derating curves. Confirm that the 22 Ω dynamic impedance meets the circuit's ripple rejection requirements.

Part Context

This part belongs to the 1N4728A to 1N4761A series of single Zener diodes manufactured by Vishay Semiconductors. The series covers a wide voltage range from 3.3 V to 75 V within the same DO-41 package form factor, allowing for standardized footprint usage across various voltage regulation designs.

Replacement Considerations

Cross-reference with other manufacturers offering 1N4747A variants in the DO-41 package. Verify that substitute components match the 20 V nominal voltage, 1300 mW power rating, and ±5% tolerance specifications.

FAQ

What is the maximum surge current for the 1N4747A?

The maximum surge current (IZM) is specified as 45 mA.

How does the power dissipation change with temperature?

Power dissipation is rated at 1300 mW provided leads are kept at ambient temperature; derating is required as ambient temperature increases beyond 25 °C.