Nexperia USA Inc. BZX384-A2V4X

Overview

BZX384-A2V4X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 2.4 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog signal conditioning and power rail stabilization circuits.

For engineers reviewing the BZX384-A2V4X datasheet, BZX384-A2V4X pinout, BZX384-A2V4X application, or BZX384-A2V4X equivalent, key selection criteria include its tight ±1 % tolerance, low 2.4 V regulation point, SOD323 footprint compatibility, and thermal resistance of 415 K/W in free air - critical for space-constrained, thermally sensitive designs.

Technical Context

This device operates in reverse-bias breakdown mode with a specified Zener voltage of 2.37 V to 2.43 V at I_Z = 5 mA and exhibits a temperature coefficient of −3.5 mV/K to 0.0 mV/K across its operating range. Its differential resistance is ≤600 Ω at I_Z = 5 mA, supporting stable regulation under moderate load variation.

The diode features a maximum reverse current of 100 μA at V_R = 1 V and a forward voltage of ≤0.9 V at I_F = 10 mA, enabling reliable clamping and low-loss forward conduction where needed. Junction-to-ambient thermal resistance is 415 K/W on FR4 PCB, defining its derating envelope in ambient-limited environments.

Key Specifications

Pinout & Package

Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size and 0.45 mm lead pitch. Marking bar denotes cathode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-A2V4X, MMBZ5221BS-7-F trades accuracy and miniaturization for cost, while BZX384-B2V4 sacrifices tolerance and leakage control for broader availability - making the A-grade variant optimal for precision, space- and power-sensitive designs.

Availability

BZX384-A2V4X is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C protection circuits, wearable battery monitors, and IoT voltage supervision requiring stable component supply and guaranteed traceability.

Supply support for BZX384-A2V4X 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 solutions, headquartered in Nijmegen, Netherlands.

The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage reference and clamping in consumer, industrial, and communications equipment where small size and tight tolerance are essential.

FAQ

What is the maximum continuous reverse current this diode can sustain?

The BZX384-A2V4X is not rated for continuous reverse current; it operates in Zener breakdown mode with a specified test current of 5 mA. Its maximum steady-state power dissipation is 300 mW, limiting continuous Zener current to approximately 125 mA at 2.4 V - but practical design limits it to ≤20 mA to maintain stability and avoid thermal runaway on standard PCBs.

Can this diode be used in series to achieve higher regulation voltages?

No - the BZX384-A2V4X is not designed for series stacking. Its ±1 % tolerance and temperature coefficient (−3.5 to 0.0 mV/K) cause unpredictable cumulative error and thermal drift. For higher voltages, select a single Zener from the BZX384 series' 37-value range up to 75 V, ensuring matched thermal behavior and tighter overall tolerance.

How does the SOD323 package affect thermal performance compared to DO-35?

The SOD323 package has significantly higher junction-to-ambient thermal resistance (415 K/W vs. ~200 K/W for DO-35), meaning it heats up faster under identical power. However, its smaller footprint allows tighter copper pour integration, and its R_th(j-sp) of 110 K/W enables effective heat sinking via cathode pad - making it superior in high-density layouts despite lower absolute thermal efficiency.

Is this part qualified for automotive applications?

No - the BZX384-A2V4X is explicitly marked as non-automotive qualified in the revision history (Rev. 4, January 2023). It lacks AEC-Q200 stress testing and automotive-grade screening. For automotive use, Nexperia offers the -Q qualified BZX384-Q series; substituting this part may compromise reliability in temperature-cycled or vibration-prone environments.