1N5355A/TR8

Overview

The Microchip Technology 1N5355A/TR8 is a silicon 5.0-watt Zener diode from the JEDEC registered 1N5333-5388B series, manufactured by the Microsemi Scottsdale Division. It provides voltage regulation at a nominal Zener voltage of 18 V with a standard tolerance of ±10%, indicated by the 'A' suffix. The device operates within a temperature range of -65°C to +150°C and features a T-18 axial lead package. Electrical characteristics include a maximum dynamic impedance of 2.5 ohms and a maximum reverse current of 0.5 µA. The component is available in tape and reel packaging.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Withstands high surge stresses and exhibits minimal changes in voltage versus current
• Features flexible axial-lead mounting terminals for through-hole applications
• Moisture classification is Level 1 per IPC/JEDEC J-STD-020B without requiring dry pack

Applications

• Voltage regulation circuits requiring 5-watt power dissipation
• Power supply protection against transient overvoltages
• Reference voltage generation in electronic systems

Procurement Notes

Verify the specific manufacturer origin, as the part number originates from the Microsemi Scottsdale Division which has undergone corporate acquisition. Confirm RoHS compliance status, as the datasheet indicates e3 suffixes are required for compliant devices while standard versions may not be. Ensure the TR8 suffix matches the required tape and reel packaging configuration for automated assembly processes.

Selection Notes

Select this component when a 18 V regulation point with ±10% tolerance is required in a 5-watt axial package. Consider the thermal resistance of 25 °C/W junction-to-lead for heat sinking requirements. Verify that the maximum steady-state power dissipation aligns with the circuit's ambient temperature conditions and PCB copper pad specifications.

Part Context

This component belongs to the 1N5333B through 1N5388B series of silicon 5-watt Zener diodes. The series offers a wide selection of voltages from 3.3 V to 200 V. Different suffix letters identify specific voltage tolerances, with 'A' denoting ±10%. The series is JEDEC registered and designed for high maximum DC currents with adequate heat sinking.

Replacement Considerations

Equivalent parts within the same series include 1N5355B (±5% tolerance) or 1N5355C (±2% tolerance). Surface mount equivalents such as SMBJ5355A or SMBG5355A are available for space-constrained designs.