1N3311A

Overview

The Microchip Technology 1N3311A is a high-power 50 W Zener diode designed for voltage regulation within the 1N3305 through 1N3350B series. It provides a nominal Zener voltage of 12 V with a tolerance of ±10%. The device operates at a test current of 1,000 mA and features a maximum dynamic impedance of 1.0 Ohm. It utilizes a hermetically sealed DO-5 (DO-203AB) package with an internal solder bond construction. The component supports junction and storage temperatures ranging from -65°C to +175°C.

Feature Summary

• Hermetically sealed welded metal and glass construction with internal solder bond
• Standard polarity configuration connecting the anode directly to the case
• Inherently radiation hard design suitable for harsh environments
• ESD nonsensitive performance verified per MIL-STD-750 Method 1020

Applications

• Voltage regulation in power supplies requiring broad operating current ranges
• High-power protection circuits utilizing adequate mounting and heat sinking
• Military and aerospace systems requiring radiation-hardened components

Procurement Notes

Verify that the specific part number suffix matches the required tolerance level, as the 'A' suffix denotes a ±10% Zener voltage tolerance. Confirm the polarity requirement, noting that standard units feature an anode-to-case connection while reverse polarity requires an 'R' suffix. Ensure the procurement documentation aligns with the manufacturer's specifications for the 1N3305–1N3350B series to guarantee correct electrical characteristics and mechanical fit.

Selection Notes

Select this component when a 12 V reference with ±10% tolerance is required in a high-power application. The DO-5 stud mount package necessitates appropriate thermal management hardware for operation above 75°C. Consider the inherent radiation hardness and ESD robustness for deployment in specialized industrial or defense environments where standard commercial parts may be insufficient.

Part Context

This component belongs to the Microsemi Scottsdale Division 1N3305 through 1N3350B series of 50 W Zener diodes. These devices are JEDEC registered and offer a wide voltage selection range from 3.9 V to 200 V. The series is also available in JAN, JANTX, and JANTXV military qualifications under MIL-PRF-19500/358 standards by adding specific prefixes to the part number.

Replacement Considerations

Equivalent parts include the 1N3311B, which shares the same package and power rating but offers a tighter ±5% voltage tolerance. Other series members within the 1N3305–1N3350B family provide different voltage ratings using identical mechanical structures.