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Product Detailed Parameters
- Description：DIODE ZENER 45V 10W DO4
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：45 V
- Tolerance：±5%
- Power - Max：10 W
- Impedance (Max) (Zzt)：13 Ohms
- Current - Reverse Leakage @ Vr：10 µA @ 33 V
- Operating Temperature：-65°C ~ 175°C (TJ)
- Mounting Type：Stud Mount
- Package / Case：DO-203AA, DO-4, Stud
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 2 A
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N2994RB is a 10-watt Zener diode with a nominal voltage of 45V. It features a DO-213AA (DO-4) stud mount package and operates within a junction temperature range of -65°C to +175°C. The device provides standard reverse polarity, where the cathode connects to the stud. Electrical characteristics include a maximum dynamic impedance of 13 Ohms at the test current and a maximum DC Zener current of 400mA at 25°C.
Feature Summary
- Hermetically sealed welded construction with internal solder bond for reliability.
- Inherently radiation hard design suitable for harsh environments.
- Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.
Applications
- Voltage regulation over broad current and temperature ranges.
- Military and aerospace electronic systems requiring high reliability.
- Radiation-hardened circuit protection applications.
Procurement Notes
Verify the specific qualification level required, as JAN, JANTX, and JANTXV grades are available. Confirm that the reverse polarity suffix RB matches the circuit design requirements. Ensure mounting hardware specifications align with the 10-32 thread size. Check for RoHS compliance needs, noting that e3 suffixes apply only to commercial grades.
Selection Notes
Select this component when a 10W power rating and 45V regulation are necessary. The DO-4 stud mount package requires appropriate thermal management and mechanical mounting hardware. Consider the positive temperature coefficient typical for voltages above 5V. Verify that the operating environment does not exceed the specified junction temperature limits.
Part Context
This part belongs to the 1N2970B through 1N3015B series of 10-watt Zener diodes. These devices are JEDEC registered and qualified per MIL-PRF-19500/124. The series covers voltage regulation values from 3.9V to 200V, offering various tolerance and polarity options for diverse industrial and military applications.
Replacement Considerations
Compatible substitutes include other 1N2994 variants such as 1N2994 or 1N2994A, provided they meet the same electrical and mechanical specifications. Ensure any replacement maintains the required hermetic seal and radiation hardness if applicable to the original system design.
FAQ
What is the terminal polarity configuration for the 1N2994RB?
The 'RB' suffix indicates reverse polarity, meaning the cathode is connected to the stud terminal.
Is the 1N2994RB resistant to radiation?
Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.
