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1N4955US
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Product Detailed Parameters
- Description：DIODE ZENER 7.5V 5W D5B
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：7.5 V
- Tolerance：±5%
- Power - Max：5 W
- Impedance (Max) (Zzt)：1.5 Ohms
- Current - Reverse Leakage @ Vr：100 µA @ 5.7 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Surface Mount
- Package / Case：SQ-MELF, E
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 1 A
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N4955US is a surface mount Zener Voltage Regulator diode designed for high-reliability applications. It operates within a temperature range of -65°C to +175°C and dissipates up to 5 Watts. The device features a nominal Zener voltage of 7.5 V with a test current of 175 mA, maintaining a maximum dynamic impedance of 1.5 Ohms at the test point. It exhibits a maximum reverse leakage current of 100 µA at 5.7 V and a forward voltage of 1.5 V at 1.0 A.
Feature Summary
- Hermetically sealed voidless glass package construction
- Internal metallurgical bonds ensuring robust physical integrity
- Triple-layer passivation for enhanced protection
- Inherently radiation hard design
Applications
- High-reliability aerospace systems
- Military defense electronics
- Critical power regulation circuits where failure is not tolerated
Procurement Notes
Verify that the component meets MIL-PRF-19500/356 standards for military qualification. Confirm the specific suffix requirements if tighter voltage tolerances are needed, as standard versions carry a 5% tolerance. Ensure the ordering information matches the required surface mount D-5B package configuration.
Selection Notes
Select this component when a hermetically sealed surface mount solution is required for harsh environments. It serves as the SMT equivalent to axial-leaded 1N4955 devices. Consider the 5W power dissipation capability and wide operating temperature range when designing thermal management strategies for space-constrained boards.
Part Context
This part belongs to the 1N4954US through 1N4996US series of 5 Watt Zener Voltage Regulators. These components are industry-recognized for their durability and are available in various voltage selections ranging from 3.3 to 390 volts. The series supports JAN, JANTX, JANTXV, and JANS grades per military specifications.
Replacement Considerations
JAN1N4955CUS
FAQ
What is the maximum continuous regulator current (IZM) for the 1N4955US?
The maximum continuous regulator current is 630 mA.
How is polarity indicated on the 1N4955US package?
Polarity is indicated by a band on the cathode end of the device.
