Nexperia USA Inc. BZX79-B10,143

Overview

BZX79-B10,143 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 as a low-power voltage reference in bias networks, feedback loops, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient and packaged in hermetically sealed SOD27 (DO-35) glass.

For engineers reviewing the BZX79-B10,143 datasheet, BZX79-B10,143 pinout, BZX79-B10,143 application, or BZX79-B10,143 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal coefficient (4.5 mV/K), junction-to-ambient thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and reverse leakage (200 nA at 7 V), all critical for precision reference stability and surge resilience in compact analog designs.

Technical Context

This device functions as a two-terminal, silicon planar Zener diode operating in reverse breakdown mode. Its regulation relies on controlled avalanche and Zener mechanisms depending on voltage range-dominant Zener effect below ~5.6 V and avalanche above-and exhibits a positive temperature coefficient of +4.5 mV/K at 10 V, indicating increasing V_Z with junction temperature.

The SOD27 package provides hermetic glass sealing with axial leads and cathode band marking, enabling stable operation up to 200 °C storage temperature and 200 °C junction temperature. Thermal performance is defined by R_{th j-a} = 380 K/W (unmetallized PCB, max lead length), limiting continuous power to 400 mW at 50 °C ambient per note 1.

Key Specifications

Pinout & Package

Hermetically sealed SOD27 (DO-35) axial-leaded glass package with cathode indicated by a colored band. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B10,143, the 1N4740A offers higher surge capacity and power handling but sacrifices precision and form factor, while the BZX84-C10 trades tolerance and power for miniaturization-making the BZX79-B10,143 optimal for through-hole, precision 10 V references requiring hermetic reliability.

Availability

BZX79-B10,143 is available at Aetrix Electronics and suitable for power supply references, overvoltage protection circuits, and sensor bias networks requiring stable component supply and long-term parametric consistency.

Supply support for BZX79-B10,143 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, industrial, and consumer 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 where hermetic packaging and tight tolerances are essential.

FAQ

What is the maximum continuous forward current for BZX79-B10,143?

The maximum continuous forward current is 250 mA, specified under standard conditions with tie-point temperature ≤50 °C and lead length ≤8 mm. This rating applies only during forward conduction-not during Zener operation-and must be derated if ambient temperature exceeds 50 °C per the thermal resistance curve in Figure 2 of the datasheet.

How does the temperature coefficient affect regulation accuracy over temperature?

The BZX79-B10,143 has a +4.5 mV/K temperature coefficient at 5 mA, meaning its Zener voltage increases by approximately 4.5 mV per Kelvin rise in junction temperature. Over a 100 °C range (25–125 °C), this results in ~450 mV shift-requiring thermal design consideration in precision references, though it remains stable within its ±2% initial tolerance band.

Can BZX79-B10,143 be used in parallel for higher power dissipation?

No-Zener diodes should not be paralleled due to mismatched breakdown voltages causing current hogging and thermal runaway. Each BZX79-B10,143 must be used individually with appropriate series current-limiting resistance. For higher power needs, select a single higher-rated device like the 1N4740A (1 W) instead.

What is the significance of the "143" suffix in BZX79-B10,143?

The "143" is Nexperia's internal ordering code denoting tape-and-reel packaging (143 = 3000 pcs/reel), lead finish (matte tin), and compliance with specific quality and testing standards. It does not affect electrical parameters-the core device remains the BZX79-B10 Zener diode with ±2% tolerance and 10 V nominal voltage.