Nexperia USA Inc. BZB84-B4V7-QR

Overview

BZB84-B4V7-Q from Nexperia is a dual Zener diode in SOT23 package with common-anode configuration, 4.7 V nominal Zener voltage (±2 % tolerance), 300 mW total power dissipation, and AEC-Q101 qualification for automotive voltage regulation and clamping functions.

For engineers reviewing the BZB84-B4V7-Q datasheet, BZB84-B4V7-Q pinout, BZB84-B4V7-Q application, or BZB84-B4V7-Q equivalent, this device supports dual-rail voltage reference, overvoltage protection, and precision biasing in space-constrained automotive ECUs and industrial sensor interfaces where stable dual-Zener behavior and thermal robustness are required.

Technical Context

This dual common-anode Zener diode integrates two independent 4.7 V Zener junctions sharing a single anode terminal, enabling compact dual-voltage reference or bidirectional clamping without discrete pairing. Each diode supports 5 mA test current and exhibits 80 Ω typical differential resistance at I_Z = 5 mA.

It operates across −55 °C to +150 °C ambient, with thermal resistance from junction to solder point of 100 K/W, and delivers −3.5 to +0.2 mV/K temperature coefficient over its working current range - critical for stable regulation in engine bay or powertrain modules.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads and standardized footprint per Fig. 12–13.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5225BS and BZX84-C4V7, the BZB84-B4V7-Q uniquely delivers dual 4.7 V Zener functionality in one AEC-Q101-qualified SOT23 package - reducing component count, improving thermal coupling between references, and enabling compact automotive designs where space and qualification are critical.

Availability

BZB84-B4V7-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, infotainment power sequencing, and motor drive gate bias clamping requiring stable component supply and long-term lifecycle support.

Supply support for BZB84-B4V7-Q 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, clamping, and reference applications demanding high thermal stability and space-efficient dual-diode integration.

FAQ

What is the maximum continuous reverse current the BZB84-B4V7-Q can sustain at 4.7 V?

The device is rated for 5 mA Zener test current (I_Z = 5 mA) per diode under steady-state conditions. Continuous operation above this level risks exceeding the 300 mW total power limit unless thermal management is enhanced. Derating is required above 25 °C ambient per the thermal resistance curve in Table 6.

Can the two Zener diodes operate independently with different cathode loads?

Yes - pins 1 (K1) and 2 (K2) are electrically isolated cathodes sharing only the common anode (pin 3). Each cathode can be loaded with independent resistors and driven into breakdown separately, enabling asymmetric reference or clamping configurations without crosstalk.

Is the 40 W non-repetitive peak power rating applicable to both diodes simultaneously?

No - the 40 W rating applies per diode, not per package. Simultaneous 40 W surges on both diodes would exceed the 300 mW total DC power limit and cause thermal runaway. Surge events must be staggered or limited to one diode at a time for safe operation.

How does the temperature coefficient of −3.5 to +0.2 mV/K affect regulation accuracy over temperature?

This coefficient means the Zener voltage shifts by up to ±0.2 mV/K near 4.7 V - resulting in approximately ±14 mV drift over a 70 °C range (−40 °C to +125 °C). For applications requiring <0.5 % regulation stability, external compensation or selection of tighter-tolerance batches is recommended.