1N5278B BK

Single Zener Diodes Overview

The Central Semiconductor Corp 1N5278B BK is a silicon Zener diode in the DO-35 axial lead package. It provides a nominal Zener voltage of 170 V with a ±5% tolerance, operating at a test current of 0.74 mA. The device dissipates up to 500 mW and maintains a maximum reverse leakage current of 0.1 µA at 129 V. Electrical characteristics include a maximum Zener impedance of 1900 Ω at the test current and a temperature coefficient of +0.110 %/°C.

Single Zener Diodes Feature Summary

• High-voltage regulation capability within the 500mW power dissipation class
• Reliable performance across an extended junction temperature range from -65°C to +200°C
• Standardized 5% voltage tolerance for consistent circuit behavior

Single Zener Diodes Applications

• Industrial control systems requiring stable high-voltage references
• Commercial equipment utilizing precision voltage regulation
• Computer applications needing reliable overvoltage protection

Single Zener Diodes Procurement Notes

This component has been officially transitioned to End of Life status by the manufacturer. Last purchase orders must be placed within six months of the official notice date, with final shipments occurring twelve months after that date. No direct replacement part numbers are currently available from the manufacturer for this specific configuration.

Single Zener Diodes Selection Notes

Select this component only if the application specifically requires a 170V Zener voltage within a DO-35 package. Verify that the system can accommodate the specified 1900 Ω impedance and +0.110 %/°C temperature coefficient. Due to the End of Life status, confirm long-term availability constraints before committing to the design.

Single Zener Diodes Part Context

The 1N5278B belongs to the 1N5221B through 1N5278B series of silicon Zener diodes manufactured by Central Semiconductor Corp. This series covers a wide voltage range from 2.4V to 170V, all housed in the standard DO-35 glass axial-lead case. The 'BK' suffix indicates a Tin/Lead plating option for the leads.

Single Zener Diodes Replacement Considerations

No public confirmed substitute part numbers are listed for the 1N5278B BK. The manufacturer's documentation explicitly lists N/A for replacements, indicating no direct equivalent is provided within their current portfolio.