1N4691D

Overview

The Microchip Technology 1N4691D is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 6.2 V with a tight tolerance of ±1%. The device is rated for a power dissipation of 500 mW and utilizes a DO-7 (DO-35) through-hole package. Key electrical characteristics include a maximum reverse leakage current of 10 µA and a test current of 50 µA. It operates within a temperature range of -65 °C to +200 °C, ensuring reliability in demanding environments.

Feature Summary

• Provides precise voltage regulation with a ±1% tolerance on the 6.2 V Zener voltage.
• Utilizes a hermetically sealed glass DO-7 axial leaded package for environmental protection.
• Capable of handling a power dissipation of 500 mW for stable operation.
• Features low reverse leakage current to minimize standby power loss.

Applications

• Precision voltage reference circuits
• Overvoltage protection stages
• Voltage clamping applications

Procurement Notes

Verify the specific suffix 'D' indicates the ±1% tolerance variant, as standard 1N4691 parts often have 5% tolerance. Confirm RoHS compliance status, as historical data suggests some variants may not be compliant. Check for obsolescence notices from Microchip Technology, as this component has been identified as discontinued or end-of-life by other distributors. Ensure the DO-7 package dimensions match your PCB footprint requirements.

Selection Notes

Select the 1N4691D when high accuracy is required, distinguishing it from the standard 1N4691 which typically offers 5% tolerance. Consider the 500 mW power rating against the expected current in your circuit to ensure thermal stability. The DO-7 package is suitable for through-hole mounting. Verify that the 6.2 V breakdown voltage aligns with your reference needs, noting that Zener impedance varies with current.

Part Context

The 1N4691 series belongs to a long-standing family of silicon Zener diodes widely used in electronic design. The 'D' suffix specifically denotes the tighter manufacturing tolerance compared to the base part number. Microchip Technology acquired assets from previous manufacturers like Motorola and Central Semiconductor, maintaining continuity in specifications for this legacy part number across different production eras.

Replacement Considerations

Direct substitutes include the 1N4691B (if 2% tolerance is acceptable) or generic equivalents from Vishay and Central Semiconductor. For higher precision, verify availability of other ±1% Zener diodes with similar voltage ratings. Ensure any replacement matches the DO-7 package and 500 mW power rating.