Nexperia USA Inc. BZB84-C4V3-QR

Overview

BZB84-C4V3-QR from Nexperia is a dual Zener diode in SOT23 package with common-anode configuration, rated for 4.3 V nominal Zener voltage (±5 % tolerance), 300 mW total power dissipation, and AEC-Q101 qualification for automotive voltage regulation and clamping functions.

For engineers reviewing the BZB84-C4V3-QR datasheet, BZB84-C4V3-QR pinout, BZB84-C4V3-QR application, or BZB84-C4V3-QR equivalent, this device serves as a space-efficient dual-voltage reference for rail stabilization, overvoltage protection, and precision biasing in compact automotive ECUs and industrial sensor interfaces.

Technical Context

This dual-common-anode Zener diode integrates two independent 4.3 V Zener elements sharing a single anode terminal, enabling bidirectional clamping or dual-rail referencing from one footprint. It operates within −55 °C to +150 °C ambient range and supports non-repetitive surge handling up to 40 W at 100 µs pulse width.

Its differential resistance is ≤90 Ω at I_Z = 5 mA, temperature coefficient is −3.5 to 0.0 mV/K, and reverse current is ≤3 µA at V_R = 1 V - confirming stable low-current regulation suitable for battery-backed circuits and low-power microcontroller I/O protection.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch); thermally optimized for FR4 PCB with single-sided copper and standard reflow footprint.

Key Features

Applications

Availability

BZB84-C4V3-QR is available at Aetrix Electronics and suitable for automotive engine control, infotainment power management, body electronics protection, and electric power steering systems requiring stable component supply with AEC-Q101 traceability and long-term lifecycle support.

Supply support for BZB84-C4V3-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 focused on high-volume, high-reliability essential components - delivering discrete, logic, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for dual-rail voltage regulation and transient suppression in harsh-environment automotive electronics.

FAQ

What is the Zener voltage tolerance for BZB84-C4V3-QR?

The "C" suffix denotes ±5 % tolerance, meaning the measured Zener voltage falls between 4.00 V and 4.60 V at I_Z = 5 mA and T_j = 25 °C. This tolerance band is verified per AEC-Q101 test conditions and applies across the full operational temperature range.

Can BZB84-C4V3-QR replace two separate 4.3 V Zeners in a design?

Yes - its dual-common-anode architecture allows direct substitution for two discrete 4.3 V Zeners sharing a common ground or negative rail. Pin 3 (CA) connects to the shared reference point, while pins 1 and 2 independently serve each regulated node without additional routing.

Is thermal derating required above 25 °C ambient?

Yes - total power dissipation must be linearly derated above 25 °C at 2.4 mW/°C, based on R_th(j-a) = 417 K/W. At 85 °C ambient, maximum continuous power drops to 156 mW. Derating ensures junction temperature remains ≤150 °C under worst-case conduction and surge conditions.

How does the dual configuration affect surge handling capability?

Each diode handles surges independently up to 40 W (100 µs), but total device power remains limited to 300 mW DC. During simultaneous surge events on both cathodes, energy distribution depends on individual impedance - validated testing confirms no thermal crosstalk or failure mode degradation under specified pulse conditions.