Nexperia USA Inc. BZX79-C75,113

Overview

BZX79-C75,113 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 75 V breakdown voltage at 2 mA test current, 170 Ω typical differential resistance, and 95 mV/K temperature coefficient at I_Z = 2 mA. It operates in hermetically sealed SOD27 (DO-35) glass package, rated for 500 mW total power dissipation at T_amb = 50 °C, and serves as a precision low-power voltage reference in analog sensor signal conditioning circuits.

For engineers reviewing the BZX79-C75,113 datasheet, BZX79-C75,113 pinout, BZX79-C75,113 application, or BZX79-C75,113 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse current (0.2 A), and junction-to-ambient thermal performance under pulsed load conditions.

Technical Context

This device functions as a passive two-terminal voltage reference, relying on controlled avalanche breakdown in silicon to maintain stable reverse-bias voltage across its terminals. Its operation requires external current limiting and is specified at T_j = 25 °C, with thermal derating applied above 50 °C ambient.

The BZX79-C75,113 exhibits a positive temperature coefficient of +73.4 to +88.6 mV/K over 25–150 °C, enabling predictable voltage drift in temperature-compensated reference designs. Its 35 pF capacitance at 1 MHz and 0 V reverse bias supports stable operation in low-frequency regulation applications without significant phase shift.

Key Specifications

Pinout & Package

Hermetically sealed SOD27 (DO-35) glass package with axial leads; cathode identified by a dark band on the glass body. Leads are tinned copper-clad steel, suitable for wave or hand soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX79-B75,113, the C-series offers relaxed tolerance at lower cost and identical thermal behavior; versus 1N4744A, it trades higher power capability for smaller size and tighter thermal resistance control in constrained layouts.

Availability

BZX79-C75,113 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, PLC input protection, medical instrumentation reference supplies, and test & measurement equipment calibration requiring stable component supply and long-term parametric consistency.

Supply support for BZX79-C75,113 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, industrial, and computing markets.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, designed specifically for low-power, precision voltage reference and overvoltage clamping in cost-sensitive, space-constrained applications.

FAQ

What is the maximum continuous reverse current for BZX79-C75,113 at 25 °C ambient?

The maximum continuous reverse current is determined by power dissipation limits: at 25 °C ambient, P_tot = 500 mW applies, so I_Z ≤ 500 mW / 75 V ≈ 6.7 mA. Derating begins above 50 °C ambient per the 380 K/W thermal resistance specification.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

With a typical S_Z of +73.4 to +88.6 mV/K, the voltage drift over 165 K temperature span is approximately +12.1 V to +14.6 V - a +16.1% to +19.5% change from nominal 75 V. This must be compensated in high-accuracy systems using matched diodes or thermistors.

Can BZX79-C75,113 be used in parallel for higher power handling?

No - Zener diodes exhibit manufacturing variations in V_Z and r_dif, causing unequal current sharing. Parallel connection risks thermal runaway in the lowest-V_Z unit. For higher power, use a single higher-rated device like 1N4744A or active regulation.

Is the SOD27 package compatible with reflow soldering processes?

The SOD27 (DO-35) glass package is not rated for standard Pb-free reflow profiles due to thermal shock risk. It is qualified for wave soldering and hand soldering only, with peak temperature ≤300 °C for ≤3 seconds and minimum lead spacing of 2.5 mm to avoid glass fracture.