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1N4678 BK TIN/LEAD
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Product Detailed Parameters
- Description：1.8V 500MW TH DIODE-ZENER SINGLE
- Series：-
- Mfr：Central Semiconductor Corp
- Package：Box
- Voltage - Zener (Nom) (Vz)：1.8 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：-
- Current - Reverse Leakage @ Vr：7.5 µA @ 1 V
- Operating Temperature：-65°C ~ 200°C (TJ)
- Mounting Type：Through Hole
- Package / Case：DO-204AH, DO-35, Axial
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 100 mA
- Grade：-
- Qualification：-
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Overview
The Central Semiconductor Corp 1N4678 BK TIN/LEAD is a through-hole Zener diode with a 1.8 V nominal voltage and 5% tolerance. It features a DO-35-2 package, 500 mW power dissipation, and operates from -65°C to +200°C. Key electrical parameters include a maximum reverse leakage current of 7.5 µA, a test current of 50 µA, and a forward current rating of 200 mA.
Feature Summary
- Provides stable voltage regulation at low operating currents suitable for precision reference applications.
- Features an internal metallurgical bond construction similar to military requirements for enhanced reliability.
- Offers extended thermal performance capabilities with a maximum operating temperature of +200°C.
Applications
- Voltage regulation in circuits requiring low test current operation.
- Reference voltage sources in industrial instrumentation.
- Protection circuits utilizing the robust glass axial-leaded construction.
Procurement Notes
Verify the specific suffix designation against official datasheets to confirm lead material composition and screening levels. Ensure the procurement specification matches the required voltage tolerance and package style. Confirm RoHS compliance status if restricted substances are mandated by the end-use application standards.
Selection Notes
Select this component when a low-voltage Zener reference with high thermal stability is required. The DO-35 package suits through-hole designs needing moderate power handling. Consider the 50 µA test current for low-power biasing scenarios where minimal self-heating is critical for accuracy.
Part Context
This part belongs to the 1N4678 series of 0.5-watt Zener voltage regulators. The series provides a selection of voltages from 1.8 to 43 volts in standard DO-35 axial-leaded glass packages. These devices are JEDEC registered and offer options for tighter tolerances and military screening.
Replacement Considerations
Equivalent surface mount versions exist in the MLL4678 series. Axial-leaded equivalents from other manufacturers may be considered if pin compatibility and electrical specifications align with the original design requirements.
