Nexperia USA Inc. BZB84-B27-QR

Overview

BZB84-B27-QR from Nexperia is a dual Zener diode in SOT23 package with common-anode configuration, rated for 27 V nominal Zener voltage (±2 % 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 such as engine control units and body electronics.

For engineers reviewing the BZB84-B27-QR datasheet, BZB84-B27-QR pinout, BZB84-B27-QR application, or BZB84-B27-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-diode common-anode topology for rail-to-rail clamping or dual-reference generation.

Technical Context

This dual Zener diode integrates two independent 27 V Zener elements sharing a common anode terminal, enabling symmetrical bidirectional clamping or independent voltage referencing from a single node. Its ±2 % V_Z tolerance and low temperature coefficient (18.9–25.3 mV/K at I_Z = 2 mA) support stable regulation across automotive temperature ranges (−55 °C to +150 °C).

The device operates within strict absolute maximum ratings: 200 mA forward current per diode, 150 °C junction temperature, and 40 W non-repetitive peak reverse power (100 µs square wave). Thermal resistance from junction to solder point is 100 K/W, confirming suitability for thermally demanding PCB layouts with minimal copper area.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm, 1.9 mm pitch), optimized for automated assembly and high-density routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZB84-C27-Q, the BZB84-B27-QR delivers tighter regulation critical for safety-critical sensing; versus MMBZ5262BS-7-F, it offers integrated dual topology, higher surge robustness, and certified automotive readiness-justifying its use in ECU and ADAS power domains.

Availability

BZB84-B27-QR is available at Aetrix Electronics and suitable for automotive engine control units, infotainment systems, and advanced driver-assistance systems requiring stable component supply with full traceability and long-term lifecycle assurance.

Supply support for BZB84-B27-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 essential efficiency-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.

The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient protection in harsh automotive environments.

FAQ

What is the maximum continuous reverse current the BZB84-B27-QR can sustain at 27 V?

The device has no specified continuous reverse current rating at 27 V; its operation is defined by Zener test current (I_Z = 2 mA) and power limit. At 27 V, sustained reverse current must stay below ~11.1 mA to remain within 300 mW P_tot, assuming negligible forward drop. Derating applies above 25 °C ambient per thermal resistance data.

Can BZB84-B27-QR replace a single Zener diode in existing designs?

Yes, but only if the circuit uses the common-anode configuration intentionally-for example, connecting CA to ground and using one cathode as active Zener. Using only one diode forfeits the dual functionality but retains all electrical specs for that channel; unused cathode must be left open or tied appropriately to avoid leakage paths.

How does the ±2 % tolerance affect performance at elevated temperature?

At 125 °C, the 27 V Zener exhibits a temperature coefficient of +21.4 to +25.3 mV/K. Combined with ±2 % initial tolerance, total V_Z deviation remains within ±3.5 % across −40 °C to +125 °C, verified per datasheet Table 9 and Fig. 6–7, ensuring predictable behavior in under-hood applications.

Is reflow soldering profile information available for BZB84-B27-QR?

Yes-the SOT23 package follows standard JEDEC J-STD-020 profiles. Nexperia recommends peak reflow temperature of 260 °C for 30 seconds max, with ramp rates ≤ 3 °C/s pre-peak. Figure 12 in the datasheet provides exact solder land dimensions and paste volume guidance for optimal wetting and void control.