Nexperia USA Inc. BZX84-A4V3,215

Overview

BZX84-A4V3,215 from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and clamping in signal conditioning, power supply feedback, and overvoltage protection circuits. It delivers 4.3 V nominal Zener voltage at 5 mA, with 90 Ω typical differential resistance, <3 µA reverse current at 3.4 V, and operates across –55 °C to +150 °C ambient.

For engineers reviewing the BZX84-A4V3,215 datasheet, BZX84-A4V3,215 pinout, BZX84-A4V3,215 application, or BZX84-A4V3,215 equivalent, this page provides verified electrical behavior, thermal limits, SOT23 terminal mapping, real-world regulation use cases, and validated alternative options for design-in and BOM optimization.

Technical Context

This discrete Zener diode operates in reverse breakdown mode to maintain stable DC voltage under varying load and temperature conditions. Its ±1 % tolerance and low 90 Ω dynamic impedance ensure tight regulation accuracy in feedback loops and reference nodes.

Designed for surface-mount assembly on FR4 PCBs with single-sided 70 µm copper, it supports pulsed non-repetitive surge handling up to 40 W (100 µs, square wave) while maintaining 250 mW steady-state dissipation at ≤25 °C ambient.

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 1.3 mm pitch, 2.9 mm × 1.3 mm footprint, and 1.1 mm height per Figure 11.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-A4V3,215, the BZX84-B4V3,215 trades 1 % accuracy for lower unit cost and wider availability, while MMSZ4V3T1G offers cross-manufacturer sourcing flexibility at the expense of guaranteed 4.3 V precision-making the A-grade optimal for closed-loop feedback where regulation stability directly impacts system accuracy.

Availability

BZX84-A4V3,215 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision reference applications requiring stable component supply, long-term lifecycle assurance, and traceable manufacturing origin.

Supply support for BZX84-A4V3,215 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 solutions with focus on efficiency, miniaturization, and robustness for industrial, consumer, and communications markets.

The BZX84 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for space-constrained, low-power voltage reference and clamping functions where ±1 % accuracy and SOT23 manufacturability are critical.

FAQ

What is the maximum continuous reverse current the BZX84-A4V3,215 can sustain without degradation?

The device is rated for 200 mA maximum forward current but is not intended for continuous reverse conduction. At its nominal Zener voltage of 4.3 V, sustained reverse current must be limited to ≤58 mA to stay within the 250 mW total power dissipation limit at 25 °C ambient. Derating is required above 25 °C per the 500 K/W junction-to-ambient thermal resistance.

Can BZX84-A4V3,215 replace a 4.3 V TL431 in a feedback loop?

No-it lacks the active error amplifier and adjustable reference of TL431. However, it can serve as a fixed 4.3 V shunt reference in simple linear regulators or comparator thresholds where ±1 % accuracy and low dynamic impedance are sufficient, provided external current limiting and thermal management are implemented.

Is pin 2 truly unused, or does it require grounding?

Pin 2 is internally not connected (n.c.) per Table 2 and must remain unconnected on the PCB. Grounding or routing it risks mechanical stress on the bond wire or unintended parasitic coupling. The SOT23 outline in Figure 11 confirms no internal tie to die or lead frame.

How does temperature affect the 4.3 V Zener voltage in practical operation?

At I_Z = 5 mA, the temperature coefficient is –3.5 mV/K (typical), meaning voltage decreases ~0.35 V from 25 °C to 125 °C ambient. This drift is linear and predictable, enabling compensation in high-accuracy systems via lookup tables or analog correction networks.