Nexperia USA Inc. BZT52-C4V3X

Overview

BZT52-C4V3X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 4.3 V nominal Zener voltage at 5 mA, with 500 Ω max differential resistance and 3 μA reverse current at 1 V, used for precision low-power voltage regulation in sensor biasing and reference circuits.

For engineers reviewing the BZT52-C4V3X datasheet, BZT52-C4V3X pinout, BZT52-C4V3X application, or BZT52-C4V3X equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (210 K/W junction-to-solder-point), power dissipation limit (590 mW at 25 °C), and SOD123 surface-mount compatibility with standard FR4 PCB footprints.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. Its 4.3 V nominal Zener voltage is specified at 5 mA test current with ±5 % tolerance, and exhibits low temperature coefficient (−3.5 to 0.0 mV/K) over 25–150 °C.

Differential resistance of ≤500 Ω ensures minimal voltage deviation under small current changes, while 350 mW pulse-rated forward power and 40 W non-repetitive peak reverse surge capability support transient resilience in compact power rails.

Key Specifications

Pinout & Package

The BZT52-C4V3X uses the SOD123 surface-mount plastic package (2.80 mm × 1.70 mm × 1.30 mm), with cathode marked by a visible band on the body and optimized for reflow soldering on standard FR4 PCBs with 0.91 mm pad width and 2.36 mm center-to-center spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5227BS-7-F, BZT52-C4V3X offers superior thermal performance (210 vs. 300 K/W j-sp) and higher surge resilience (40 W vs. 25 W), while BZX384-C4V3 trades size for reduced regulation accuracy and power margin-making BZT52-C4V3X optimal for robust, medium-current reference applications.

Availability

BZT52-C4V3X is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset reference, USB port overvoltage clamp, and optocoupler LED current regulation requiring stable component supply and consistent Zener voltage tolerance.

Supply support for BZT52-C4V3X 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 semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET devices, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The BZT52 series targets cost-sensitive, space-constrained voltage regulation needs in consumer and industrial electronics, emphasizing SMD compatibility, tight tolerance options, and robust transient handling in standardized packages.

FAQ

What is the maximum continuous reverse current the BZT52-C4V3X can handle at 25 °C ambient?

The device supports up to 250 mA forward current per Absolute Maximum Ratings, but for Zener operation, continuous reverse current is limited by power dissipation: at 25 °C ambient, 590 mW / 4.3 V ≈ 137 mA maximum steady-state Zener current. Exceeding this risks thermal runaway due to positive temperature coefficient above 5 V.

Can BZT52-C4V3X be used in place of a BZT52-B4V3 in an existing design?

Yes, but with trade-offs: BZT52-C4V3X has ±5 % tolerance (4.0–4.6 V) versus BZT52-B4V3's tighter ±2 % (4.21–4.39 V). If the circuit relies on precise 4.3 V regulation, the wider tolerance may increase output variation; verify stability under worst-case V_Z extremes and load conditions.

How does the SOD123 package affect thermal performance compared to DO-35 or SOD-123F variants?

SOD123 provides 210 K/W junction-to-solder-point resistance-lower than DO-35 (≈400 K/W) due to direct copper contact, but higher than SOD-123F (≈170 K/W) which adds a thermal pad. This makes SOD123 suitable for 500 mW operation on standard FR4, but not for sustained >400 mW in sealed enclosures without airflow.

Is BZT52-C4V3X qualified for automotive applications?

No. Per Nexperia's revision history (Rev. 2, October 2025), C-series parts are explicitly designated as non-automotive qualified. Automotive-grade alternatives include BZT52-C4V3-Q series, which undergo AEC-Q101 stress testing and include extended temperature screening and failure analysis reporting.