Nexperia USA Inc. BZX79-C68,113

Overview

BZX79-C68,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal breakdown voltage of 68 V, total power dissipation up to 500 mW at T_amb = 50 °C, differential resistance ≤150 Ω at I_Z = 2 mA, and non-repetitive peak reverse power dissipation of 40 W (t_p = 100 μs). It operates as a low-power voltage reference in unregulated DC supplies and overvoltage protection circuits.

For engineers reviewing the BZX79-C68,113 datasheet, BZX79-C68,113 pinout, BZX79-C68,113 application, or BZX79-C68,113 equivalent, this page delivers verified electrical parameters, thermal behavior, SOD27 package geometry, and real-world use cases for precision voltage clamping and stabilization in industrial control and power management designs.

Technical Context

This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode. Its voltage regulation relies on controlled avalanche breakdown above 6.2 V, with temperature coefficient +90 mV/K at I_Z = 2 mA - indicating positive thermal drift optimized for stable reference generation across ambient ranges.

It exhibits low dynamic impedance (150 Ω max) and junction capacitance of 35 pF at f = 1 MHz and V_R = 0 V, enabling effective high-frequency noise suppression in feedback paths. Reverse leakage remains ≤50 nA at V_R = 47.6 V (0.7 × V_Znom), supporting low-quiescent-current bias networks.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded glass package per SOD27 (DO-35) standard: 2.54 mm lead spacing, 4.25 mm body length, 1.85 mm diameter, cathode indicated by black band. Mounting requires ≤8 mm lead length and no PCB metallization pad per thermal rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-C68,113, the 1N4744A offers superior power handling and tighter regulation but requires larger board space; the BZX85C68 provides greater ruggedness and thermal performance at the expense of higher cost and footprint - both diverge in package and thermal design intent.

Availability

BZX79-C68,113 is available at Aetrix Electronics and suitable for industrial power monitoring, microcontroller reset circuits, automotive body control modules, and LED driver current sensing requiring stable component supply and long-term obsolescence management.

Supply support for BZX79-C68,113 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.

This device belongs to the BZX79 series of low-power Zener diodes designed specifically for cost-effective voltage reference and overvoltage protection in space-constrained, thermally unmanaged PCB layouts.

FAQ

What is the maximum continuous power dissipation for BZX79-C68,113?

The BZX79-C68,113 dissipates up to 500 mW at ambient temperature of 50 °C with 8 mm lead length and no PCB copper pad. Derating is required above 50 °C at 4.2 mW/°C based on R_{th j-a} = 380 K/W. This limit ensures junction temperature stays below 200 °C under steady-state conditions.

How does the temperature coefficient affect regulation accuracy?

With a typical temperature coefficient of +90 mV/K at I_Z = 2 mA, the Zener voltage increases ~6.1 V over a 68 °C rise (e.g., −40 °C to +25 °C to +100 °C). Designers must account for this drift in precision references using single diodes; compensation techniques include series/parallel combinations or TC-matched diode pairs.

Can BZX79-C68,113 be used in surface-mount designs?

No - it uses an axial-leaded SOD27 (DO-35) glass package intended for through-hole mounting only. The leads are not designed for reflow soldering or mechanical stress associated with SMT placement. For SMD equivalents, consider the BZX384-B68 (SOD-323, 250 mW) or MMBZ5263B (SOT-23, 350 mW), which differ in voltage tolerance and thermal performance.

What is the reverse leakage current at rated voltage?

At V_R = 47.6 V (0.7 × V_Znom), the maximum reverse leakage current is 50 nA per datasheet Table 2. At lower voltages (e.g., V_R = 1 V), leakage is higher - for example, 200 nA at V_R = 20 V - but remains well below 1 μA across its operational range, supporting low-power bias networks.