Nexperia USA Inc. BZX84-C22,235

Overview

BZX84-C22,235 from Nexperia is a ±5 % 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 sensor signal conditioning circuits.

For engineers reviewing the BZX84-C22,235 datasheet, BZX84-C22,235 pinout, BZX84-C22,235 application, or BZX84-C22,235 equivalent, key selection criteria include Zener voltage tolerance (±5 %), differential resistance (250 Ω max), reverse current at 17.6 V (≤0.1 μA), thermal resistance (500 K/W), and non-repetitive peak reverse power capability (40 W).

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output by conducting reverse current above its specified Zener voltage. Its operation relies on controlled avalanche breakdown in silicon, with temperature coefficient of +15.4 mV/K at 5 mA enabling predictable drift compensation in bias networks.

The SOT23 package supports surface-mount reflow and wave soldering per IPC-7095 guidelines, with thermal resistance from junction to ambient (500 K/W) and to solder point (330 K/W) defining its derating behavior under sustained load in FR4 PCB environments.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and gull-wing lead form optimized for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C22,235, MMBZ5247BS-7-F trades 50 mW power headroom for tighter supply chain availability, while BZX84-C22-TP offers improved regulation stiffness and thermal margin at slightly higher unit cost.

Availability

BZX84-C22,235 is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power microcontroller reset circuits, DC-DC converter feedback networks, and overvoltage protection clamps requiring stable component supply with consistent parametric performance across production lots.

Supply support for BZX84-C22,235 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 components, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for cost-sensitive, space-constrained applications demanding stable voltage references and robust transient suppression in consumer, industrial, and computing systems.

FAQ

What is the maximum continuous reverse current this diode can sustain at 22 V?

The BZX84-C22,235 is not rated for continuous conduction at its Zener voltage. At 22 V, it draws ~5 mA under regulation test conditions. Sustained current must be limited by an external series resistor to keep power dissipation ≤250 mW - e.g., 1 kΩ resistor limits current to 22 mA, but actual steady-state current depends on circuit topology and thermal environment.

Can this part replace a BZX84-B22 in a design?

Yes, but with trade-offs: BZX84-C22,235 has ±5 % tolerance (20.8–23.3 V) versus BZX84-B22's ±2 % (21.6–22.4 V). The wider tolerance increases output voltage variation in precision references, though it remains suitable for non-critical clamping or coarse regulation where cost and availability outweigh tight spec requirements.

Does the n.c. pin require grounding or thermal relief on the PCB?

No - Pin 2 is internally not connected and must remain electrically isolated. Do not route traces, place vias, or apply solder mask openings to it. Thermal relief is unnecessary since no heat path exists; standard SOT23 land pattern (per Figure 12) applies only to Pins 1 and 3.

How does temperature affect regulation accuracy above 85 °C?

At 125 °C junction temperature, the +15.4 mV/K coefficient causes ~616 mV increase from 25 °C baseline (40 K × 15.4 mV/K), shifting nominal 22 V regulation to ~22.62 V. This shift is linear and repeatable, allowing system-level calibration if required - datasheet confirms stability up to 150 °C junction limit.