Nexperia USA Inc. BZB84-C51,215

Overview

BZB84-C51,215 from Nexperia is a dual common-anode Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in compact DC power rails. It delivers nominal 51 V Zener voltage (±5 % tolerance), 40 W non-repetitive peak reverse power dissipation, and 300 mW total power dissipation per device - used in automotive body control modules, industrial sensor signal conditioning, and telecom power supervision circuits.

For engineers reviewing the BZB84-C51,215 datasheet, BZB84-C51,215 pinout, BZB84-C51,215 application, or BZB84-C51,215 equivalent, key selection criteria include dual-Zener common-anode topology, AEC-Q101 qualification, 51 V ±5 % V_Z tolerance, thermal resistance of 417 K/W (junction-to-ambient), and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This dual-Zener diode integrates two independent Zener junctions sharing a common anode terminal (Pin 3), enabling bidirectional clamping or dual-rail reference generation from a single SMT component. Its design supports symmetric reverse breakdown at 51 V (min 48.0 V, max 54.0 V) with differential resistance ≤400 Ω at I_Z = 2 mA and temperature coefficient of +35.7 to +57.2 mV/K.

Rated for operation from −55 °C to +150 °C ambient, it features 100 µs square-wave surge capability (40 W peak), 0.9 V forward voltage at 10 mA, and 40 pF diode capacitance at 1 MHz - making it suitable for transient suppression and stable reference applications where space-constrained dual-voltage referencing is required.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package: 3-terminal, small-outline transistor outline with 1.3 mm × 2.9 mm footprint, 1.1 mm height, and gull-wing leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5251BS-7-F and BZX84-C51,215, the BZB84-C51,215 uniquely delivers dual 51 V Zener functionality in one SOT23 package - reducing component count by 50 %, eliminating inter-device parameter spread, and enabling true common-anode circuit topologies impossible with single-diode alternatives.

Availability

BZB84-C51,215 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom power monitoring requiring stable component supply with AEC-Q101 assurance and long-term production continuity.

Supply support for BZB84-C51,215 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, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The BZB84 series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for space-constrained voltage regulation and transient protection in harsh-environment automotive and industrial control systems.

FAQ

What is the maximum continuous reverse current (I_Z) for stable regulation?

The BZB84-C51,215 is characterized at I_Z = 2 mA for V_Z specification, with maximum continuous Zener current limited by thermal constraints. At 25 °C ambient, P_tot = 300 mW allows up to ~5.9 mA (300 mW ÷ 51 V) before exceeding power rating - derating applies above 25 °C per R_th(j-a) = 417 K/W.

Can Pin 1 and Pin 2 be used simultaneously for independent voltage references?

Yes - Pins 1 and 2 serve as independent cathodes sharing Pin 3 (common anode). When Pin 3 is grounded, each cathode provides a separate 51 V Zener reference to distinct circuit nodes, enabling dual-rail referencing without interaction, provided total power dissipation remains ≤300 mW.

Is the 40 W surge rating applicable to both diodes simultaneously?

No - the 40 W non-repetitive peak reverse power dissipation (P_ZSM) is specified per diode. Simultaneous surge on both diodes would require derating to ensure combined junction temperature stays below 150 °C; worst-case thermal coupling limits simultaneous full-power surges to <25 W per diode.

How does the ±5 % tolerance affect precision in feedback loops?

At 51 V nominal, ±5 % tolerance means V_Z spans 48.0–54.0 V. In closed-loop feedback (e.g., SMPS error amplifier), this introduces up to ±3 % output voltage error unless trimmed. For <±0.5 % accuracy, external calibration or post-assembly trimming is required - confirmed by Table 10 data showing 48.0/54.0 V bounds at I_Z = 2 mA.