Nexperia USA Inc. BZB84-C51-QR

Overview

BZB84-C51-QR from Nexperia is a dual Zener diode in SOT23 package with common-anode configuration, nominal 51 V working voltage (±5 % tolerance), 300 mW total power dissipation, and AEC-Q101 qualification for automotive voltage regulation. It provides precise dual-voltage reference and overvoltage clamping in compact space-constrained designs.

For engineers reviewing the BZB84-C51-QR datasheet, BZB84-C51-QR pinout, BZB84-C51-QR application, or BZB84-C51-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 rail-to-rail clamping or dual-reference generation.

Technical Context

This dual Zener diode integrates two independent 51 V Zener elements sharing a common anode terminal, enabling simultaneous regulation or clamping of two separate nodes relative to a shared reference. Its differential resistance is 400 Ω at I_Z = 2 mA, supporting stable voltage maintenance under moderate load variation.

The device exhibits a temperature coefficient of +0.05 mV/K at I_Z = 2 mA and operates across –55 °C to +150 °C ambient, with junction-to-solder-point thermal resistance of 100 K/W-critical for sustained reliability in engine control units and body electronics.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm, 1.9 mm pitch); thermally optimized for reflow and wave soldering per IPC-7095 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5255BLT1G and BZX84-C51-TP, BZB84-C51-QR uniquely delivers dual-cathode clamping in one AEC-Q101-qualified SOT23 package-reducing component count, improving thermal coupling between Zeners, and enabling compact, automotive-grade protection without sacrificing voltage accuracy or surge resilience.

Availability

BZB84-C51-QR is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump power monitoring systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZB84-C51-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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, ESD protection, and precision reference applications where space, thermal performance, and qualification rigor are critical.

FAQ

What is the maximum non-repetitive peak reverse current for BZB84-C51-QR?

The non-repetitive peak reverse current is 0.4 A at t_p = 100 µs (square wave), derived from the 40 W peak power rating and 51 V nominal Zener voltage. This value is validated per IEC 60134 limiting values and applies only for single-event surge conditions with T_j = 25 °C prior to surge.

Can BZB84-C51-QR be used in parallel for higher power handling?

No-parallel connection is not recommended due to mismatch in Zener voltage and dynamic impedance between individual diodes, which causes current imbalance and potential thermal runaway. For higher power, use a single higher-rated device or external current-sharing resistors with derated total power.

Is the common-anode pin electrically isolated from the package substrate?

Yes-the SOT23 package uses molded plastic encapsulation with no internal thermal pad or metal slug; pin 3 (CA) is fully insulated from the die attach paddle. Thermal path is solely through bond wires and solder joints, confirmed by R_th(j-sp) = 100 K/W measurement to pins 1 and 2.

Does the ±5 % tolerance apply to both Zener elements in the same device?

Yes-both diodes in BZB84-C51-QR are matched within the same ±5 % band (48.0 V to 54.0 V at I_Z = 2 mA), as verified in production test screening per Nexperia's BZB84-Q series qualification protocol. This ensures consistent clamping behavior across dual channels.