1N4742A BK PBFREE

Overview

The Central Semiconductor Corp 1N4742A BK PBFREE is a silicon Zener diode designed for voltage regulation. It features a nominal Zener voltage of 12 V with a ±5% tolerance, housed in a DO-41 axial through-hole package. The device supports a maximum power dissipation of 1.0 W at 50°C and operates within a temperature range of -65°C to +200°C. Electrical characteristics include a test current of 21 mA, a maximum reverse leakage current of 5.0 μA at 9.1 V, and a maximum DC current of 9.1 mA.

Feature Summary

• Provides stable voltage regulation using silicon Zener technology
• Features hermetically sealed glass construction for reliability
• Supports high operating temperatures up to 200°C

Applications

• Industrial equipment voltage regulation
• Commercial circuit protection
• Entertainment system power management
• Computer application voltage reference

Procurement Notes

Verify the specific ordering suffix required for plating configuration before purchase. The 'BK' designation indicates bulk packaging, while 'PBFREE' confirms lead-free compliance. Confirm availability status as manufacturing transitions may affect supply continuity. Ensure the procurement documentation matches the exact part number to avoid receiving incorrect voltage ratings or package types.

Selection Notes

Select this component when a precise 12 V reference is required in a standard through-hole layout. The DO-41 package accommodates standard PCB drilling patterns. Verify that the circuit design can handle the specified maximum DC current of 9.1 mA without exceeding the 1.0 W power dissipation limit under worst-case thermal conditions.

Part Context

This component belongs to the 1N4728A through 1N4764A series of 1.0 Watt silicon Zener diodes manufactured by Central Semiconductor. The series covers a wide voltage range from 3.3 V to 100 V with consistent 5% tolerance across all variants. These devices are engineered for robust performance in demanding environments requiring reliable voltage clamping.

Replacement Considerations

No official replacement part numbers are documented for this specific model.