Nexperia USA Inc. BZX84W-B7V5X

Overview

BZX84W-B7V5X from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 7.5 V nominal Zener voltage at 5 mA, 80 Ω differential resistance, and 4.0 mV/K temperature coefficient. It delivers 275 mW total power dissipation on FR4 PCB and supports high-frequency regulation in compact power rails and reference circuits.

For engineers reviewing the BZX84W-B7V5X datasheet, BZX84W-B7V5X pinout, BZX84W-B7V5X application, or BZX84W-B7V5X equivalent, key selection factors include its tight ±2% voltage tolerance, low 150 pF capacitance at 1 MHz, 1 µA reverse current at 5 V, and validated performance in low-power analog references and ESD-clamped signal conditioning.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and temperature conditions. Its 7.5 V nominal Zener voltage is specified at I_Z = 5 mA with ±2% tolerance, and it exhibits a positive 4.0 mV/K temperature coefficient above 6 V, enabling predictable drift compensation in precision references.

The device features low dynamic impedance (80 Ω at 5 mA), minimal junction-to-ambient thermal resistance (455 K/W on standard FR4), and non-repetitive surge capability up to 40 W for 100 µs pulses - supporting transient suppression in low-energy bias networks.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm height, optimized for automated reflow assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-B7V5X, MMBZ5236B trades accuracy and power for cost and availability, while BZX84-C7V5 matches form and thermal behavior but sacrifices 3× tighter voltage control - making the B-series essential for sub-1% reference stability.

Availability

BZX84W-B7V5X is available at Aetrix Electronics and suitable for industrial sensor calibration, low-power reset circuitry, and RF bias network design requiring stable component supply, consistent parametric performance, and long-term lifecycle continuity.

Supply support for BZX84W-B7V5X 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 and industrial-grade components.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-stability voltage regulation in space-constrained consumer, industrial, and communications equipment.

FAQ

What is the maximum continuous reverse current the BZX84W-B7V5X can sustain at 7.5 V?

The device is not rated for continuous reverse current at Zener voltage; instead, it is characterized by Zener test current (I_Z = 5 mA) and maximum power dissipation (275 mW). At 7.5 V, this corresponds to a theoretical max continuous I_Z of 36.7 mA, but actual safe operating current depends on ambient temperature and PCB thermal design per the 455 K/W R_th(j-a).

Can BZX84W-B7V5X be used in place of a 7.5 V TL431 shunt regulator?

No - the BZX84W-B7V5X is a passive two-terminal Zener diode with fixed 7.5 V breakdown, while the TL431 is an active three-terminal adjustable shunt regulator with programmable output (2.5–36 V), lower dynamic impedance (~0.2 Ω), and built-in error amplifier. They serve fundamentally different regulation architectures.

Does the 'n.c.' pin require PCB routing or thermal relief?

No - Pin 2 is internally not connected and must remain electrically isolated. No copper trace, solder mask opening, or thermal relief is needed; standard SOT323 footprint (Fig. 9) treats it as a mechanical land only, with zero electrical function or thermal path requirement.

How does the 4.0 mV/K temperature coefficient impact long-term voltage stability?

At 7.5 V, a 4.0 mV/K coefficient means voltage drift is +0.3 V over a 75 K rise (e.g., −40 °C to +35 °C ambient). Combined with ±2% initial tolerance, total variation remains within ±3.2% across industrial temperature range - sufficient for non-critical biasing but insufficient for metrology-grade references without compensation.