Nexperia USA Inc. BZX79-B10,133

Overview

BZX79-B10,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 10 V breakdown voltage at 5 mA test current, 50 Ω typical differential resistance, and 4.5 mV/K temperature coefficient. It operates in low-power stabilization circuits requiring stable reference voltages under 500 mW dissipation, such as power supply feedback loops and sensor biasing networks.

For engineers reviewing the BZX79-B10,133 datasheet, BZX79-B10,133 pinout, BZX79-B10,133 application, or BZX79-B10,133 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and DO-35 package compatibility with through-hole PCB assembly.

Technical Context

This device functions as a two-terminal voltage reference by operating in reverse breakdown mode, where controlled avalanche or Zener conduction maintains a stable cathode-to-anode voltage across its specified current range (1–20 mA). Its 10 V nominal Zener voltage is defined at I_Ztest = 5 mA with ±2% initial tolerance and exhibits a positive temperature coefficient of +4.5 mV/K, indicating voltage increases with junction temperature.

The diode uses a hermetically sealed glass SOD27 (DO-35) package with axial leads, optimized for low-capacitance operation (≈20 pF at 0 V) and capable of handling non-repetitive 100 μs surges up to 90 A (derived from P_ZSM = 40 W and V_Z ≈ 10 V). Junction-to-ambient thermal resistance is 380 K/W under standard mounting conditions.

Key Specifications

Pinout & Package

Hermetically sealed glass SOD27 (DO-35) package with axial leads; cathode identified by a colored band on the glass body. Lead diameter 0.45–0.56 mm, overall length 25.4 mm, body diameter 1.85 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B10,133, the 1N4740A offers lower cost but sacrifices 2.5× lower power headroom and ±5% tolerance, while the BZX84-C10 trades through-hole compatibility for miniaturization-neither matches the 500 mW dissipation and ±2% accuracy needed for high-stability analog references.

Availability

BZX79-B10,133 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, overvoltage protection circuits, and microcontroller reset systems requiring stable component supply and long-term obsolescence management.

Supply support for BZX79-B10,133 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

Nexperia is a global leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive and industrial markets.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, engineered for precision low-power voltage referencing and stabilization in cost-sensitive, high-reliability applications.

FAQ

What is the maximum continuous forward current rating for BZX79-B10,133?

The absolute maximum continuous forward current is 250 mA at T_amb = 25 °C, per the Limiting Values table. This rating assumes no simultaneous reverse-bias operation and is intended for brief forward-conduction events such as inrush limiting-not sustained forward conduction in normal Zener operation.

Can BZX79-B10,133 be used in surface-mount designs?

No-BZX79-B10,133 uses a through-hole SOD27 (DO-35) glass package with axial leads and is not compatible with SMT reflow processes. For surface-mount equivalents, consider Nexperia's BZX84-C10 (SOT-23) or PZM10A (SOT-323), which share the same 10 V Zener voltage but differ in tolerance and power rating.

What is the recommended test current for measuring nominal Zener voltage?

The nominal 10 V Zener voltage is specified at I_Ztest = 5 mA, as confirmed in Table 1 of the datasheet. Measurements taken at this current yield the most accurate representation of the device's rated V_Z, minimizing error from differential resistance and temperature coefficient effects.

How does the +4.5 mV/K temperature coefficient affect circuit performance?

A +4.5 mV/K coefficient means the Zener voltage increases by approximately 4.5 mV for every 1 °C rise in junction temperature. In a 50 °C ambient-to-junction rise, this causes ~225 mV total drift-requiring thermal derating or compensation in precision references, especially where long-term stability exceeds ±0.5%.