Nexperia USA Inc. BZX79-B62,133

Overview

BZX79-B62,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal breakdown voltage of 62 V at 2 mA test current, 120 Ω typical differential resistance, and 80 mV/K temperature coefficient. It operates as a low-power precision voltage reference in biasing, regulation, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient.

For engineers reviewing the BZX79-B62,133 datasheet, BZX79-B62,133 pinout, BZX79-B62,133 application, or BZX79-B62,133 equivalent, key selection criteria include Zener voltage tolerance, thermal coefficient stability across operating current, non-repetitive surge capability (35 A peak reverse current), and DO-35 package compatibility with through-hole PCB layouts.

Technical Context

This diode functions exclusively in reverse-biased breakdown mode, delivering stable reference voltage under controlled DC or low-duty-cycle transient conditions. Its 62 V nominal Zener voltage is specified at I_Ztest = 2 mA, with differential resistance of 120 Ω (typ.) and 450 Ω (max.), ensuring predictable impedance behavior near regulation point.

Thermal performance is defined by R_{th j-a} = 380 K/W (lead length ≤8 mm, no metallization pad) and R_{th j-tp} = 300 K/W, enabling accurate junction temperature estimation during steady-state operation. Non-repetitive surge rating is 35 A at t_p = 100 μs, supporting transient overvoltage clamping in low-energy protection circuits.

Key Specifications

Pinout & Package

SOD27 (DO-35) is a hermetically sealed glass axial-leaded package with cathode indicated by a colored band. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Device dimensions: D = 1.85 mm max., L = 25.4 mm min., b = 0.56 mm max.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B62,133, the 1N4747A trades accuracy for legacy compatibility and lower cost, while the BZX84-C62 sacrifices hermetic reliability and leakage performance for SMT manufacturability - making the BZX79-B62,133 optimal for precision, through-hole, and harsh-environment applications.

Availability

BZX79-B62,133 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line protection, optical sensor biasing, and battery monitoring systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for BZX79-B62,133 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, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, serving automotive, industrial, computing, and consumer markets.

The BZX79 series belongs to Nexperia's precision Zener diode product line, engineered for stable voltage reference and low-power regulation in cost-sensitive, high-reliability applications demanding hermetic packaging and tight tolerances.

FAQ

What is the maximum continuous power dissipation for BZX79-B62,133?

The BZX79-B62,133 is rated for 500 mW total power dissipation at an ambient temperature of 50 °C with leads ≤8 mm on a PCB without metallization pad. Derating is required above 50 °C at 4.2 mW/°C based on R_{th j-a} = 380 K/W.

How does the temperature coefficient affect regulation accuracy?

With a typical temperature coefficient of +64.4 mV/K, the BZX79-B62,133 exhibits a +3.22 V drift over a 50 °C rise - meaning its 62 V reference shifts to ~65.22 V at 100 °C junction temperature. This must be factored into system-level accuracy budgets.

Can BZX79-B62,133 be used in parallel for higher power handling?

No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same series, minor V_Z mismatches cause current hogging. Parallel operation is not recommended; use a single higher-rated device or active regulation instead.

Is the SOD27 package compatible with automated through-hole insertion equipment?

Yes - the SOD27 (DO-35) package has standardized axial lead spacing and diameter (0.56 mm max. lead width, 25.4 mm min. length), meeting IPC-7351 guidelines for wave soldering and robotic insertion in high-volume manufacturing lines.