Nexperia USA Inc. BZB84-B33,215

Overview

BZB84-B33,215 from Nexperia is a dual common-anode Zener diode in SOT23 package, rated for 33 V nominal working voltage (±2 % tolerance), 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves voltage regulation and overvoltage protection functions in automotive and industrial power rails.

For engineers reviewing the BZB84-B33,215 datasheet, BZB84-B33,215 pinout, BZB84-B33,215 application, or BZB84-B33,215 equivalent, key selection considerations include its dual-Zener topology, AEC-Q101 qualification, 32.3–33.7 V Zener voltage range at I_Z = 2 mA, thermal resistance of 417 K/W (junction-to-ambient), and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This dual-Zener device integrates two independent Zener diodes sharing a common anode (Pin 3), enabling bidirectional clamping or complementary reference generation. Its ±2 % voltage tolerance and low differential resistance (325 Ω max at I_Z = 2 mA) support precision regulation in feedback loops and voltage monitoring circuits.

Designed for surface-mount assembly on FR4 PCBs, it delivers 0.9 V forward voltage at 10 mA and operates across −55 °C to +150 °C ambient, with junction temperature limited to 150 °C. The 40 W non-repetitive surge rating (100 µs square wave) supports transient suppression in automotive load-dump scenarios.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and 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-C33,215, the BZB84-B33,215 offers tighter voltage control critical for feedback accuracy; versus MMBZ5267BS-7-F, it delivers integrated dual functionality in half the footprint and supports true common-mode transient suppression.

Availability

BZB84-B33,215 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference design, and programmable logic controller I/O conditioning requiring stable component supply and AEC-Q101 compliance.

Supply support for BZB84-B33,215 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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

The BZB84 series belongs to Nexperia's general-purpose Zener portfolio, engineered specifically for surface-mounted voltage regulation and transient suppression in harsh-environment applications demanding AEC-Q101 validation.

FAQ

What is the maximum continuous reverse current the BZB84-B33,215 can sustain at 25 °C ambient?

The device has no specified maximum continuous reverse current; instead, its 300 mW total power dissipation limits steady-state Zener current to approximately 9.1 mA at 33 V (P = V × I). Operation beyond this requires derating per the thermal resistance curve and ambient temperature, with junction temperature capped at 150 °C.

Can the two Zener diodes in the BZB84-B33,215 be used independently with different bias conditions?

Yes - Pins 1 and 2 are electrically isolated cathodes sharing only the common anode (Pin 3). Each diode operates independently: one can be biased into breakdown while the other remains reverse-biased below V_Z, enabling asymmetric clamping or dual-reference generation without crosstalk.

Is the BZB84-B33,215 suitable for use in a 12 V automotive system?

No - its 33 V nominal Zener voltage is mismatched for 12 V rail protection. It is intended for 24 V or higher systems (e.g., commercial vehicle 24 V batteries or industrial 33 V supplies). For 12 V applications, BZB84-B12,215 (11.8–12.2 V) is the appropriate variant.

How does the common-anode configuration affect PCB layout compared to discrete Zeners?

The common-anode structure reduces net component count and routing complexity: only three pads needed versus six for two discrete Zeners. Ground or reference plane connection is consolidated at Pin 3, minimizing loop area and improving EMI performance in high-frequency transient environments.