Nexperia USA Inc. BZB84-B3V3-QR

Overview

BZB84-B3V3-QR from Nexperia is a dual common-anode Zener diode in SOT23 package, providing precise 3.3 V voltage regulation (±2 % tolerance) for biasing, reference, and overvoltage protection circuits. It delivers 300 mW total power dissipation, supports 200 mA forward current per diode, and is AEC-Q101 qualified for automotive under-hood applications.

For engineers reviewing the BZB84-B3V3-QR datasheet, BZB84-B3V3-QR pinout, BZB84-B3V3-QR application, or BZB84-B3V3-QR equivalent, key selection criteria include dual-Zener topology with shared anode, tight 3.3 V Zener voltage tolerance, non-repetitive 40 W surge capability, and thermal resistance of 100 K/W to solder point - critical for compact automotive PCB designs requiring robust voltage clamping.

Technical Context

This dual-Zener device integrates two independent 3.3 V Zener diodes sharing a common anode terminal (Pin 3), enabling compact dual-rail referencing or bidirectional transient suppression without external node routing. Its differential resistance is ≤95 Ω at 5 mA, ensuring stable regulation under load variation.

The device operates across –55 °C to +150 °C ambient, with junction temperature limited to 150 °C and thermal resistance from junction to solder point at 100 K/W - optimized for FR4 PCBs with standard SOT23 footprint and reflow soldering.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch); thermally optimized for FR4 PCBs with single-sided copper and tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS and BZX84-C3V3, BZB84-B3V3-QR uniquely delivers matched dual 3.3 V regulation in one AEC-Q101-qualified package - reducing component count, improving thermal coupling between references, and enabling automotive-compliant bidirectional transient suppression without layout compromise.

Availability

BZB84-B3V3-QR is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, infotainment power sequencing, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZB84-B3V3-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 specializing in high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

The BZB84-Q series targets automotive and industrial applications demanding compact, robust voltage regulation - designed specifically to replace discrete dual-Zener solutions while meeting AEC-Q101 stress test requirements for under-hood reliability.

FAQ

What is the maximum continuous reverse current for BZB84-B3V3-QR at 25 °C?

The device supports up to 200 mA forward current per diode, but its continuous reverse (Zener) current is limited by thermal dissipation. At 25 °C ambient on standard FR4, the maximum steady-state Zener current is approximately 90 mA - calculated from 300 mW total power divided by 3.3 V nominal Zener voltage, derated for dual-diode operation and thermal margin.

Can BZB84-B3V3-QR be used for bidirectional ESD protection?

No - it is a unidirectional Zener pair with common anode; each diode conducts only in reverse breakdown. For bidirectional ESD clamping, a dedicated TVS array like PESD5V0S1BA is required. However, two BZB84-B3V3-QR units (anodes tied) can form a crude symmetrical clamp, though not recommended due to mismatched turn-on and lack of specified ESD waveform performance.

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

The common-anode design reduces netlist nodes and eliminates the need for a shared anode trace between two discrete devices - cutting parasitic inductance by ~60 % and saving ~1.2 mm² board area. It also ensures identical thermal exposure for both Zeners, minimizing voltage tracking drift during temperature transients.

Is the 40 W non-repetitive peak power rating per diode or for the entire package?

The 40 W rating applies per diode - confirmed in Table 5 (Limiting values) and Figure 1, which specify "Per diode: Non-repetitive peak reverse power dissipation". Both diodes may be subjected to simultaneous 40 W surges only if thermal coupling allows junction temperature to remain below 150 °C, which requires careful PCB copper pour design per Nexperia's SOT23 thermal guidelines.