Nexperia USA Inc. BZB84-B18,215

Overview

BZB84-B18,215 from Nexperia is a dual common-anode Zener diode in SOT23 package, designed for precision voltage regulation and transient suppression in compact DC power rails. It delivers nominal 18 V Zener voltage (±2 % tolerance), 225 Ω typical differential resistance at 2 mA, and 1.5 A non-repetitive peak reverse current under 100 µs surge - used in automotive body control modules for 12 V system overvoltage clamping.

For engineers reviewing the BZB84-B18,215 datasheet, BZB84-B18,215 pinout, BZB84-B18,215 application, or BZB84-B18,215 equivalent, key selection criteria include dual-Zener common-anode topology, AEC-Q101 qualification, 18 V nominal breakdown with tight ±2 % tolerance, thermal resistance of 100 K/W to solder point, and compatibility with reflow-soldered SOT23 footprints.

Technical Context

This dual-Zener device integrates two identical 18 V Zener elements sharing a common anode (Pin 3), enabling bidirectional voltage clamping or dual-rail reference generation from a single footprint. Its construction supports simultaneous forward conduction on one diode while the other operates in reverse breakdown.

Designed for automotive-grade reliability, it meets AEC-Q101 stress test requirements and sustains 150 °C junction temperature. The SOT23 package provides 417 K/W junction-to-ambient thermal resistance in free air and 100 K/W to solder point - critical for thermal management in space-constrained engine bay electronics.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package: 3-terminal, 1.3 mm × 2.9 mm × 1.1 mm body, gull-wing leads, tin-plated terminations compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZB84-C18,215, the BZB84-B18,215 offers tighter voltage control essential for precision sensing; versus PDZ18B,115, its dual-cathode architecture reduces component count and interconnect inrush paths - directly improving surge immunity margin in automotive ECUs.

Availability

BZB84-B18,215 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC input stages, medical infusion pump power monitors, and telecom remote radio units requiring stable component supply with AEC-Q101 assurance.

Supply support for BZB84-B18,215 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 high-volume, high-reliability logic, discrete, and MOSFET solutions - spun off from Philips in 2017 and headquartered in Nijmegen, Netherlands.

The BZB84 series belongs to Nexperia's automotive-qualified Zener portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh-environment electronics such as engine management and ADAS subsystems.

FAQ

What is the maximum allowable surge duration for reliable operation at 1.5 A?

The BZB84-B18,215 supports non-repetitive peak reverse current of 1.5 A for pulses ≤100 µs (square wave, T_j = 25 °C prior to surge). Longer durations require derating per Figure 1 in the datasheet - e.g., 40 W peak power drops to 25 W at 300 µs. Exceeding these limits risks irreversible junction damage.

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). This allows two separate 18 V references tied to the same ground node, provided each cathode drives ≤2 mA DC current to maintain regulation accuracy and avoid thermal runaway.

Is the 300 mW total power dissipation rating applicable to both diodes combined?

Yes - P_tot = 300 mW is the absolute maximum for the entire device. If both diodes conduct simultaneously (e.g., one forward, one reverse), their combined steady-state power must remain ≤300 mW at T_amb ≤25 °C. Derating is required above 25 °C per the thermal resistance curve.

How does the ±2 % tolerance affect temperature coefficient performance?

The temperature coefficient (S_Z) ranges from +12.4 mV/K to +16.0 mV/K at I_Z = 2 mA, and this slope is consistent across the 17.6–18.4 V range. Tighter voltage tolerance does not alter S_Z magnitude but ensures predictable drift onset - critical for designs requiring <±100 ppm/°C total error budget.