Nexperia USA Inc. BZB84-B22-QR

Overview

BZB84-B22-QR from Nexperia is a dual Zener diode in SOT23 package with common-anode configuration, rated for 22 V nominal Zener voltage (±2 % tolerance), 300 mW total power dissipation, and AEC-Q101 qualification for automotive voltage regulation and clamping. It delivers stable reference voltage in dual-rail power monitoring circuits.

For engineers reviewing the BZB84-B22-QR datasheet, BZB84-B22-QR pinout, BZB84-B22-QR application, or BZB84-B22-QR equivalent, key selection criteria include Zener voltage tolerance, non-repetitive surge capability (40 W), thermal resistance (100 K/W to solder point), and dual-cathode/common-anode topology for compact bidirectional protection.

Technical Context

This dual Zener diode integrates two independent 22 V Zener elements sharing a common anode terminal, enabling symmetrical overvoltage clamping on complementary signal lines or split-rail supplies. Its ±2 % voltage tolerance ensures tight regulation accuracy under 5 mA test current.

Designed for automotive-grade reliability, it supports junction temperatures up to 150 °C and withstands non-repetitive 100 µs surges up to 40 W per diode. The SOT23 footprint enables high-density PCB layout while maintaining thermal performance via low R_th(j-sp) of 100 K/W.

Key Specifications

Pinout & Package

Supplied in SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch), optimized for automated assembly and thermal transfer to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5247BS and BZX84-C22-TP, BZB84-B22-QR uniquely delivers integrated dual 22 V Zeners with ±2 % tolerance and AEC-Q101 compliance in one SOT23 device-reducing bill-of-materials count, improving thermal coupling, and guaranteeing automotive-grade surge resilience.

Availability

BZB84-B22-QR is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, infotainment power sequencing, and medical diagnostic equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.

Supply support for BZB84-B22-QR 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 specializing in high-volume, high-reliability logic, discrete, and MOSFET components, with leadership in automotive-qualified parts.

The BZB84-Q series belongs to Nexperia's automotive Zener portfolio, engineered specifically for robust voltage regulation and transient suppression in 12 V/24 V vehicle systems under extreme thermal and electrical stress.

FAQ

What is the maximum continuous reverse current this diode can handle at 25 °C?

The absolute maximum continuous reverse current is not specified as a standalone parameter; instead, the device is rated for 300 mW total power dissipation at T_amb ≤ 25 °C. At 22 V Zener voltage, this corresponds to a maximum steady-state reverse current of approximately 13.6 mA (P = V × I → I = 300 mW / 22 V). Exceeding this current risks thermal runaway without adequate PCB heat sinking.

Can BZB84-B22-QR be used for bidirectional TVS protection?

No - BZB84-B22-QR is a dual unidirectional Zener diode with common anode, not a bidirectional TVS. It clamps positive transients on each cathode relative to the common anode but cannot suppress negative-going surges below the anode potential. For true bidirectional protection, a dedicated TVS array like PUSB3FR4 or SMAJ22A is required.

How does the ±2 % tolerance affect regulation accuracy in a 5 mA reference circuit?

At I_Z = 5 mA, the guaranteed V_Z range is 21.6 V to 22.4 V. This ±0.4 V window introduces a ±1.8 % deviation from nominal 22 V, directly impacting reference-dependent functions such as ADC scaling or comparator thresholds. For tighter accuracy, post-calibration or closed-loop feedback is recommended.

Is the common-anode pin electrically isolated from the package thermal pad?

There is no thermal pad in the SOT23 package; pin 3 (CA) is the sole anode connection and serves as the primary thermal path to the PCB via solder joint. Thermal resistance from junction to solder point (R_th(j-sp)) is specified at 100 K/W, confirming that heat flows directly through pin 3 into the board - no isolation exists between electrical and thermal conduction paths.