1N2838RB

Overview

The 1N2838RB is a single silicon Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 100 V with a tolerance of ±5%. The device is designed for through-hole mounting in a TO-204AD (TO-3) package, which utilizes a metal disk button form factor. It supports a maximum power dissipation of 50 W and operates within a temperature range of -65 °C to 175 °C. Key electrical characteristics include a reverse leakage current of 10 µA at 76 V and an impedance of 20 Ω.

Feature Summary

• High power handling capability suitable for robust circuit protection applications
• Wide operating temperature range extending up to 175 °C for demanding environments
• Metal disk button packaging providing mechanical stability and thermal performance

Applications

• Voltage regulation in high-power industrial systems
• Overvoltage protection circuits requiring robust thermal management
• Reference voltage sources in precision instrumentation

Procurement Notes

Verify the manufacturer origin, as this component has been produced by Central Semiconductor, Motorola/NXP, and Microsemi/Microchip. Confirm the specific datasheet version matches your design requirements. Ensure the TO-204AD package dimensions align with your PCB or chassis layout constraints before finalizing procurement.

Selection Notes

Select this component when a 100 V Zener reference with 50 W power dissipation is required. The TO-204AD package necessitates through-hole mounting and adequate heatsinking infrastructure. Consider the 20 Ω impedance and 10 µA leakage current specifications against your circuit's sensitivity requirements to ensure stable operation under varying load conditions.

Part Context

This part belongs to the standard Zener diode family used for voltage clamping and regulation. Historically associated with military and aerospace standards due to its rugged TO-3 construction, it remains relevant in applications requiring high reliability and significant power handling capabilities beyond surface-mount alternatives.

Replacement Considerations

Direct substitutes include JAN1N2838RB from Microchip Technology. Other manufacturers such as Central Semiconductor and Motorola have produced equivalent parts under the same designation. Verify pinout compatibility and thermal resistance values when cross-referencing with alternative suppliers.