onsemi BZX55C10_T50R

Overview

BZX55C10_T50R from Fairchild Semiconductor is a 10 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C lead temperature, with 15 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 7.5 V. It provides precise voltage regulation in low-power reference and protection circuits.

For engineers reviewing the BZX55C10_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, dynamic impedance at nominal test current, reverse leakage at specified VR, and DO-35 mechanical compatibility with through-hole PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a doped PN junction. Its 10 V nominal zener voltage is stabilized across a 5 mA test current, with tight 5% tolerance maintained under standard thermal conditions (Ta = 25°C, TL ≤ 75°C).

The DO-35 glass package enables reliable high-temperature operation from –65°C to +200°C, and its 4.0 mW/°C thermal derating above 75°C ensures predictable power handling in ambient-constrained environments without forced cooling.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with 1N4740A and BZX55C10-TR, the BZX55C10_T50R offers identical regulation performance in a compact DO-35 form factor optimized for space-constrained through-hole designs, while differing in packaging format and thermal derating profile.

Availability

BZX55C10_T50R is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and sensor biasing applications requiring stable component supply across industrial, automotive, and consumer electronics programs.

Supply support for BZX55C10_T50R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.

The BZX55C series belongs to Fairchild's general-purpose Zener diode product line, designed for cost-effective, reliable voltage regulation and transient suppression in non-critical analog and power circuits.

FAQ

What is the zener voltage tolerance of BZX55C10_T50R?

The BZX55C10_T50R has a zener voltage tolerance of ±5%, meaning its nominal 10 V rating falls between 9.5 V and 10.6 V when measured at 5 mA test current and 25°C ambient. This tolerance is guaranteed per the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1 and applies to all units within the specified operating conditions.

Does BZX55C10_T50R support high-temperature operation?

Yes, BZX55C10_T50R is rated for operation from –65°C to +200°C, with power derating beginning above 75°C at 4.0 mW/°C. Its DO-35 glass package and silicon construction enable reliable function in under-hood automotive and industrial control environments where thermal cycling and sustained elevated temperatures occur.

What is the maximum reverse leakage current for BZX55C10_T50R?

The maximum reverse leakage current for BZX55C10_T50R is 0.1 μA at V_R = 7.5 V and T_a = 25°C. This ultra-low leakage ensures minimal parasitic current draw in battery-powered voltage monitor circuits and precision analog front-ends where signal integrity depends on negligible off-state conduction.

Can BZX55C10_T50R be used in place of BZX55C10-TR?

Yes, BZX55C10_T50R and BZX55C10-TR share identical electrical specifications, DO-35 package dimensions, and thermal characteristics-the only difference is packaging format (bulk vs. tape-and-reel). No circuit or layout changes are needed when substituting BZX55C10_T50R for BZX55C10-TR in manual or semi-automated assembly processes.

What is the dynamic impedance of BZX55C10_T50R at its rated test current?

The dynamic impedance (Z_Z) of BZX55C10_T50R is 15 Ω when measured at I_Z = 5 mA and T_a = 25°C. This value reflects how tightly the device maintains its zener voltage under small-signal AC variations, directly impacting regulation stability in feedback loops and reference buffers.