Nexperia USA Inc. BZX79-C4V7,143

Overview

BZX79-C4V7,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 4.4 V to 5.0 V nominal Zener voltage at 5 mA test current, with 425 Ω typical differential resistance and −1.4 mV/K temperature coefficient. It delivers stable low-voltage reference or stabilization in power supply feedback paths, microcontroller reset circuits, and analog sensor biasing.

For engineers reviewing the BZX79-C4V7,143 datasheet, BZX79-C4V7,143 pinout, BZX79-C4V7,143 application, or BZX79-C4V7,143 equivalent, this part serves as a cost-effective, through-hole Zener solution where ±5% regulation tolerance, 500 mW power dissipation, and low-capacitance (<300 pF) are design-critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified Zener voltage of 4.4–5.0 V at I_Z = 5 mA. Its differential resistance of 425 Ω (typ.) and temperature coefficient of −1.4 mV/K indicate moderate regulation stability across temperature and load variations.

The device is optimized for low-power stabilization: non-repetitive peak reverse power dissipation reaches 40 W for 100 μs pulses, while continuous power dissipation is rated at 500 mW at T_amb = 50 °C with 8 mm lead length, reflecting its suitability for transient-suppressed, board-level voltage references.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) 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 1N4732A and BZX55-C4V7, BZX79-C4V7,143 offers tighter board-space fit in SOD27, lower parasitic capacitance, and optimized thermal resistance for ambient-limited designs-making it ideal for modern compact analog subsystems.

Availability

BZX79-C4V7,143 is available at Aetrix Electronics and suitable for power supply feedback references, microcontroller reset circuits, sensor biasing networks, and overvoltage clamp protection requiring stable component supply and consistent parametric performance.

Supply support for BZX79-C4V7,143 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, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with high-volume, high-reliability components.

The BZX79 series belongs to Nexperia's standard Zener diode portfolio, engineered for cost-effective, robust voltage regulation in general-purpose analog and power management circuits.

FAQ

What is the maximum continuous Zener current for BZX79-C4V7,143?

The device supports a continuous forward current of 250 mA, but Zener operation is defined at test currents up to 5 mA. At 500 mW dissipation and 4.7 V nominal voltage, the practical maximum Zener current is approximately 106 mA - however, thermal derating above 50 °C ambient must be applied using R_{th j-a} = 380 K/W.

Is BZX79-C4V7,143 RoHS compliant and halogen-free?

Yes - Nexperia confirms BZX79-C4V7,143 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SOD27 glass package contains no lead in the solderable terminations, and full compliance documentation is available via Nexperia's product change notifications.

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

With a typical S_Z of −1.4 mV/K, the Zener voltage shifts approximately −196 mV across an 140 K range - resulting in ~4.2 V at +125 °C and ~5.0 V at −40 °C. This drift is inherent to 4.7 V Zeners and must be accounted for in wide-temperature applications via calibration or compensation.

Can BZX79-C4V7,143 replace BZX79-B4V7 in existing designs?

Only if ±5% tolerance is acceptable - BZX79-B4V7 offers ±2% tolerance (4.61–4.79 V), while BZX79-C4V7 spans 4.4–5.0 V. Differential resistance and temperature coefficient also differ (B-series: 410 Ω typ., −2.5 mV/K). Substitution requires validation of system-level regulation margin and thermal drift behavior.