Nexperia USA Inc. BZX84W-B9V1X

Overview

BZX84W-B9V1X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing precise 9.1 V reverse breakdown at 5 mA with 100 Ω differential resistance and +5.5 mV/K temperature coefficient. It delivers stable reference voltage for low-power analog circuits, ESD protection clamping, and overvoltage detection in portable power management systems.

For engineers reviewing the BZX84W-B9V1X datasheet, BZX84W-B9V1X pinout, BZX84W-B9V1X application, or BZX84W-B9V1X equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at rated test current, thermal resistance, reverse leakage at sub-breakdown bias, and SOT323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse-biased avalanche mode to maintain a stable 9.1 V reference across load variations, with nominal test current of 5 mA and maximum forward voltage of 0.9 V at 10 mA. Its ±2 % tolerance ensures tight regulation for precision feedback paths in DC-DC converters and sensor signal conditioning.

The device exhibits a positive temperature coefficient of +5.5 mV/K at 5 mA, enabling predictable drift compensation in temperature-sensitive references. With 455 K/W junction-to-ambient thermal resistance on FR4 PCB, it supports continuous operation up to 150 °C junction temperature under 275 mW total power dissipation.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for high-density PCB assembly and reflow/wave soldering per standardized footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-B9V1X, BZX84W-C9V1 trades regulation accuracy for lower unit cost, while MMSZ4687T1G sacrifices miniaturization and thermal efficiency for broader distributor availability-neither offers the combined precision, size, and thermal performance of the B-series SOT323 variant.

Availability

BZX84W-B9V1X is available at Aetrix Electronics and suitable for power supply feedback reference, ESD protection clamp, and low-power sensor biasing requiring stable component supply, consistent parametric performance, and SOT323 footprint compatibility.

Supply support for BZX84W-B9V1X 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 standard-qualification components.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in space-constrained consumer, industrial, and computing applications.

FAQ

What is the maximum continuous reverse current for BZX84W-B9V1X at 25 °C ambient?

The device has no specified maximum continuous reverse current; instead, its safe operating limit is defined by total power dissipation. At 25 °C ambient on FR4 PCB, it supports up to 275 mW, corresponding to approximately 30.2 mA at 9.1 V (P = V × I). Exceeding this risks exceeding the 150 °C maximum junction temperature.

Can BZX84W-B9V1X be used in bidirectional ESD protection configurations?

No-it is a unidirectional Zener diode with anode and cathode terminals. For bidirectional ESD clamping, two devices must be connected anode-to-anode or cathode-to-cathode, or a dedicated bidirectional TVS diode should be selected. The n.c. pin does not enable dual functionality.

How does the +5.5 mV/K temperature coefficient affect long-term voltage reference stability?

This positive coefficient means the Zener voltage increases by 5.5 mV per Kelvin rise in junction temperature. Over a 100 °C range (25 °C to 125 °C), the shift is ~550 mV-approximately 6 % of 9.1 V. System-level compensation (e.g., using complementary tempcos in divider networks) is required for sub-1 % reference stability.

Is the "n.c." pin electrically isolated or internally bonded?

The pin 2 (n.c.) is fully unconnected-no internal bond wire or die attachment. It is mechanically part of the leadframe but electrically floating. PCB layout must leave it unconnected; routing traces or applying solder paste to this pad may cause mechanical stress or unintended parasitic coupling.