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1N4742A-T
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Product Detailed Parameters
- Description：DIODE ZENER 12V 1W DO41
- Series：-
- Mfr：Diodes Incorporated
- Package：Tape & Reel (TR),Cut Tape (CT)
- Voltage - Zener (Nom) (Vz)：12 V
- Tolerance：±5%
- Power - Max：1 W
- Impedance (Max) (Zzt)：9 Ohms
- Current - Reverse Leakage @ Vr：5 µA @ 9.1 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Through Hole
- Package / Case：DO-204AL, DO-41, Axial
- Voltage - Forward (Vf) (Max) @ If：1.2 V @ 200 mA
- Grade：-
- Qualification：-
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Overview
The Diodes Incorporated 1N4742A-T is a discontinued 1.0 W silicon Zener diode housed in a DO-41 glass axial package. It provides a nominal Zener voltage of 12 V with a standard tolerance of ±5%. The device operates at a test current of 21 mA and features a maximum Zener impedance of 9 Ω. It supports a temperature coefficient ranging from +0.045 to +0.085 %/°C, with an operating junction temperature range of -65 °C to +175 °C.
Feature Summary
- Provides stable voltage regulation within a 12 V nominal specification
- Features sharp reverse characteristic breakdown for precise clamping
- Constructed with hermetically sealed glass DO-41 case material
- Offers high stability and low reverse leakage current levels
Applications
- Voltage stabilization circuits
- Absolute reference voltage generation
- Overvoltage protection stages
Procurement Notes
This component is officially marked as obsolete and discontinued by the manufacturer. No alternate part is available through Diodes Incorporated. Procurement must rely on secondary market distributors or existing stock. Verify authenticity and storage conditions carefully due to the long shelf life required for lead-free components.
Selection Notes
Select this component only if legacy compatibility is mandatory. Note that the suffix indicates tape and reel packaging. Consider thermal derating above 50°C when designing power dissipation limits. Ensure the application does not require critical reliability standards without explicit manufacturer approval.
Part Context
The 1N4742A belongs to the 1N4728A through 1N4761A series of 1 Watt Zener diodes manufactured by Diodes Incorporated. This series covers a wide voltage range from 3.3 V to 75 V. The specific model utilizes a glass passivated junction and meets RoHS compliance directives for electronic equipment.
Replacement Considerations
No direct substitute is provided by the manufacturer. Cross-referencing with other vendors may yield functionally similar parts, but electrical characteristics and physical dimensions should be verified against original specifications.
