Nexperia USA Inc. BZX84-B22,235

Overview

BZX84-B22,235 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 22 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and 150 °C maximum junction temperature-used for precision low-power voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the BZX84-B22,235 datasheet, BZX84-B22,235 pinout, BZX84-B22,235 application, or BZX84-B22,235 equivalent, this page delivers verified Zener voltage, differential resistance, temperature coefficient, reverse current limits, and thermal resistance values required for stable biasing, regulation, and transient suppression design in space-constrained PCBs.

Technical Context

This device operates as a two-terminal shunt regulator: reverse-biased to maintain a stable 22 V across its cathode–anode terminals when current exceeds the knee threshold (~1 mA), with typical differential resistance of 250 Ω at I_Z = 5 mA and temperature coefficient of +15.4 mV/K ensuring predictable drift under thermal variation.

It is designed for DC regulation-not switching-within ambient temperatures from −55 °C to +150 °C, with non-repetitive peak reverse power handling up to 40 W (100 μs pulse) and thermal resistance from junction to ambient of 500 K/W on standard FR4 PCB, limiting continuous power to 250 mW at T_amb ≤ 25 °C.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact footprint (2.9 mm × 1.3 mm × 1.0 mm), tin-plated terminations, and standard reflow-compatible solder lands.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-B22,235, MMBZ5247BS trades accuracy and pin compatibility for lower cost and smaller footprint, while BZX84-C22-TP retains mechanical fit and power handling but sacrifices voltage precision-making the B-series optimal for designs requiring both tight tolerance and proven SOT23 reliability.

Availability

BZX84-B22,235 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and precision analog reference designs requiring stable component supply with consistent parametric performance across production lots.

Supply support for BZX84-B22,235 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, with manufacturing in Europe and Asia.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage regulation and stabilization in consumer, industrial, and communication equipment where small size, tight tolerance, and thermal robustness are essential.

FAQ

What is the maximum continuous reverse current for reliable long-term operation?

The BZX84-B22,235 supports up to 5 mA DC reverse current at 25 °C ambient for stable regulation without exceeding 250 mW dissipation. At higher ambient temperatures, derating applies-e.g., only ~3.5 mA at 70 °C ambient-based on its 500 K/W junction-to-ambient thermal resistance and 150 °C max junction temperature.

Can Pin 2 be grounded or left unconnected on the PCB?

Pin 2 is internally not connected and must remain electrically floating-neither grounded nor tied to any net. Routing a trace or via to it risks shorting internal die structures or compromising thermal performance; the recommended layout follows Nexperia's SOT23 footprint with solder mask defined only for Pins 1 and 3.

How does the +15.4 mV/K temperature coefficient affect circuit accuracy?

This coefficient means the Zener voltage increases by 15.4 mV per degree Celsius rise in junction temperature. Over a 100 °C range (−25 °C to +75 °C), that yields ~1.54 V drift-so designs requiring <1 % total error must either limit self-heating, add compensation circuitry, or operate within narrow ambient bands where drift remains <±0.25 V.

Is this device qualified for automotive applications?

No-BZX84-B22,235 is not automotive-qualified. Per Nexperia's Rev. 7 datasheet, it is explicitly designated as non-automotive; automotive-grade alternatives (e.g., BZX84-Q series) undergo additional AEC-Q101 stress testing and have different qualification documentation-this part is intended for industrial, consumer, and communications end-equipment only.