Nexperia USA Inc. BZX84W-C2V4X

Overview

BZX84W-C2V4X from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing 2.4 V nominal regulation at 5 mA, with 600 Ω differential resistance and −1.6 mV/K temperature coefficient. It delivers stable reference voltage for low-power biasing and overvoltage clamping in compact consumer and industrial power management circuits.

For engineers reviewing the BZX84W-C2V4X datasheet, BZX84W-C2V4X pinout, BZX84W-C2V4X application, or BZX84W-C2V4X equivalent, this part supports precision voltage referencing in space-constrained designs where thermal stability, low leakage (<50 µA at 1 V reverse), and high-frequency response are critical selection criteria.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 2.4 V reference across load variations, with specified test current of 5 mA and maximum forward voltage of 0.9 V at 10 mA. Its negative temperature coefficient (−1.6 mV/K) enables predictable drift compensation in temperature-sensitive analog stages.

The device uses silicon planar epitaxial construction and is qualified for operation from −55 °C to +150 °C ambient, with thermal resistance of 455 K/W (junction-to-ambient, FR4 PCB). It exhibits 6 pF capacitance at 1 MHz and 0 V bias, supporting use in noise-sensitive signal conditioning paths.

Key Specifications

Pinout & Package

Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint dimensions per Fig. 9 (reflow) and Fig. 10 (wave soldering).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5221BS and BZX84-C2V4, the BZX84W-C2V4X offers identical regulation performance in a smaller SOT323 footprint with integrated n.c. terminal for mechanical stability, making it optimal for ultra-dense PCB layouts requiring minimal board area and controlled thermal path.

Availability

BZX84W-C2V4X is available at Aetrix Electronics and suitable for power supply referencing, overvoltage protection, and signal level shifting requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.

Supply support for BZX84W-C2V4X 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and miniaturization.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-stability voltage regulation in consumer, industrial, and computing applications where space, thermal behavior, and parametric consistency are critical.

FAQ

What is the maximum continuous reverse current the BZX84W-C2V4X can handle?

The device has no defined maximum continuous reverse current rating; instead, its safe operating limit is governed by total power dissipation (275 mW at 25 °C ambient). At 2.4 V Zener voltage, this corresponds to a maximum average reverse current of approximately 114 mA, assuming no additional thermal derating beyond the specified ambient condition.

Can BZX84W-C2V4X be used in place of a 2.4 V TL431-based shunt regulator?

No - the BZX84W-C2V4X is a passive two-terminal Zener diode with fixed 2.4 V breakdown, whereas the TL431 is an active three-terminal programmable shunt regulator offering adjustable output (2.5 V to 36 V), lower dynamic impedance (~0.2 Ω), and tighter initial tolerance (±0.5 %). Use only where simplicity and cost outweigh precision and adjustability requirements.

Does the n.c. pin (Pin 2) require grounding or floating in layout?

Pin 2 is internally not connected and must remain unconnected in the PCB layout - neither grounded nor routed. It serves a mechanical anchoring function in the SOT323 package and has no electrical role; connecting it risks shorting adjacent traces or compromising thermal performance due to unintended heat sinking.

How does the −1.6 mV/K temperature coefficient affect regulation accuracy over temperature?

Over a 100 °C ambient range (−25 °C to +75 °C), the Zener voltage shifts by −160 mV (−1.6 mV/K × 100 K), resulting in a final value of ~2.24 V. This 6.7 % deviation from nominal must be included in system-level error budgets; for tighter stability, pair with a positive-TC component or use temperature-compensated alternatives like the BZX84W-B2V4 (−2.0 mV/K) in matched configurations.