1N3314A

Overview

The Microchip Technology 1N3314A is a high-power 50 W Zener diode housed in a hermetically sealed DO-5 (DO-203AB) stud-mount package. It provides a nominal Zener voltage of 15 V with a tolerance of ±10%. The device features an internal solder bond construction and operates within a junction temperature range of -65°C to +175°C. Key electrical characteristics include a maximum dynamic impedance of 1.4 Ohms at the test current, a forward voltage of 1.5 V at 10 A, and a reverse leakage current of 10 µA at 11.4 V.

Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design resistant to ESD per MIL-STD-750 Method 1020
• Inherently radiation hard capability
• Standard polarity configuration with anode connected to the case

Applications

• Voltage regulation over broad operating current and temperature ranges
• High power dissipation applications requiring adequate mounting and heat sinking
• Military and aerospace systems utilizing JAN, JANTX, or JANTXV qualifications

Procurement Notes

Verify that the specific order matches the required polarity suffix, as standard units have the anode to the case while reversed polarity requires an 'R' suffix. Confirm the tolerance designation corresponds to the application needs, noting that the 'A' suffix indicates ±10% voltage tolerance. Ensure thermal management provisions are included, as the device requires proper heat sinking to handle up to 50 watts of power dissipation without exceeding the maximum junction temperature limits.

Selection Notes

Select this component when a robust, high-power Zener regulator is needed in a stud-mount form factor. The DO-5 package allows for direct mounting to chassis heatsinks. Consider the thermal resistance of 2.0°C/W maximum from junction to base when designing the cooling system. Verify that the 15 V breakdown voltage aligns with the circuit requirements and that the ±10% tolerance meets the precision specifications of the design.

Part Context

The 1N3314A belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microchip Technology's Scottsdale Division. This series covers a wide voltage range from 3.9 V to 200 V. The part is JEDEC registered and shares mechanical and electrical characteristics with other members of the family, differing primarily in its specific nominal Zener voltage and associated test currents.

Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include the 1N3314B, 1N3314RA, and 1N3314RB from Microchip Technology. The 'B' suffix denotes a tighter ±5% tolerance, while the 'R' suffix indicates reversed polarity (cathode to case). Ensure any replacement matches the original polarity and tolerance requirements.