Nexperia USA Inc. BZX79-B6V8,133

Overview

BZX79-B6V8,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode in DO-35 (SOD27) glass package, designed for low-power voltage reference and stabilization at 6.8 V nominal with 30 Ω typical differential resistance at 5 mA test current and 1.2 mV/K temperature coefficient. It delivers stable regulation in power supply feedback paths, sensor biasing, and precision analog reference circuits.

For engineers reviewing the BZX79-B6V8,133 datasheet, BZX79-B6V8,133 pinout, BZX79-B6V8,133 application, or BZX79-B6V8,133 equivalent, this page provides verified electrical parameters, thermal behavior, real-world use cases, and validated alternative parts - all grounded in Nexperia's official 2002 product data sheet.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 6.66–6.94 V at 5 mA test current, exhibiting low dynamic impedance (30–80 Ω) and a positive temperature coefficient (+1.2 to +4.5 mV/K), enabling predictable drift compensation in temperature-sensitive references. Its hermetically sealed DO-35 glass package ensures long-term stability under ambient storage temperatures from −65 °C to +200 °C.

Rated for 500 mW total power dissipation at Tamb = 50 °C (with 8 mm lead length), it supports non-repetitive surge handling up to 40 W for 100 μs pulses, making it suitable for transient-suppressed voltage clamping in low-energy signal conditioning stages - not for continuous high-current regulation.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded DO-35 (SOD27) glass package with cathode indicated by a black 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 MMBZ5235B,215 and 1N4734A, BZX79-B6V8,133 offers optimal balance of through-hole manufacturability, ±2% precision, and proven long-term stability in legacy and industrial designs - especially where DO-35 form factor and hermetic reliability are prioritized over SMT density or higher power.

Availability

BZX79-B6V8,133 is available at Aetrix Electronics and suitable for power supply feedback references, sensor biasing networks, microcontroller reset circuits, and ADC reference stabilization requiring stable component supply across industrial, computing, and consumer electronics programs.

Supply support for BZX79-B6V8,133 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, with deep expertise in automotive, industrial, and consumer applications.

BZX79-B6V8,133 belongs to the BZX79 series of low-power Zener diodes engineered for precision voltage reference and stabilization in cost-sensitive, high-reliability analog circuits - emphasizing long-term parametric stability and hermetic packaging integrity.

FAQ

What is the maximum continuous forward current for BZX79-B6V8,133?

The maximum continuous forward current is 250 mA at T_amb = 25 °C, per the Absolute Maximum Ratings table. This rating applies only during forward conduction - the device is intended for reverse-bias Zener operation, and sustained forward bias above 100 mA risks thermal runaway due to its 0.9 V forward voltage drop and limited thermal resistance.

Can BZX79-B6V8,133 be used as a replacement for BZX79-C6V8?

No - BZX79-B6V8,133 has ±2% Zener voltage tolerance (6.66–6.94 V), while BZX79-C6V8 has approx. ±5% tolerance (6.4–7.2 V). The B-series offers tighter regulation critical for precision references; substituting the C-series introduces up to ±2.5 V additional uncertainty in feedback or biasing nodes, potentially violating system accuracy specs.

What is the thermal resistance from junction to tie-point (R_{th j-tp}) for this diode?

R_{th j-tp} is 300 K/W with 8 mm lead length, measured from junction to the point where leads meet the PCB. This value enables accurate junction temperature estimation during pulsed operation - for example, at 500 mW dissipation, ΔT = 150 K above tie-point temperature - and informs safe derating curves when ambient exceeds 50 °C.

Does BZX79-B6V8,133 have a specified capacitance value?

Yes - diode capacitance is 200 pF maximum at f = 1 MHz and V_R = 0 V, per Table 1. This value impacts high-frequency noise rejection and stability in fast-switching feedback paths; designers should verify loop phase margin when using this Zener in >100 kHz switching regulator references.