Nexperia USA Inc. BZX84W-C9V1X

Overview

BZX84W-C9V1X from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing 9.1 V nominal regulation at 5 mA test current, with 100 Ω differential resistance and 5.5 mV/K positive temperature coefficient. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.

For engineers reviewing the BZX84W-C9V1X datasheet, BZX84W-C9V1X pinout, BZX84W-C9V1X application, or BZX84W-C9V1X equivalent, key selection criteria include Zener voltage tolerance, thermal coefficient behavior at operating current, junction-to-ambient thermal resistance, reverse leakage at 6 V bias, and SOT323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 9.1 V reference across its cathode–anode terminals when reverse-biased above its knee voltage. Its 5.5 mV/K temperature coefficient ensures predictable drift under ambient variation, and its 150 °C maximum junction temperature supports operation in industrial environments.

The device exhibits 500 nA reverse leakage at VR = 6 V, enabling low-quiescent-current biasing in precision references. Its 455 K/W junction-to-ambient thermal resistance reflects performance on standard FR4 PCBs with single-sided copper, defining safe continuous power dissipation limits.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package: 1.5 mm × 1.3 mm footprint, 0.65 mm lead pitch, 0.9 mm height, leadless construction with three terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C9V1X, BZX84W-B9V1 offers tighter regulation at the expense of higher unit cost and identical thermal behavior, while MMBZ5240BLT1G trades compact size and low capacitance for greater power handling and looser dynamic impedance-making it suitable only where SOT323 constraints are relaxed.

Availability

BZX84W-C9V1X is available at Aetrix Electronics and suitable for power supply feedback loops, overvoltage protection clamps, and precision voltage reference circuits requiring stable component supply across industrial, telecom, and consumer electronics production.

Supply support for BZX84W-C9V1X 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, designed specifically for cost-sensitive, space-constrained regulation and protection tasks in consumer, computing, and industrial power systems.

FAQ

What is the maximum continuous reverse current this Zener can handle at 9.1 V?

The BZX84W-C9V1X is rated for 200 mA maximum forward current, but as a Zener it operates in reverse breakdown. At its nominal 9.1 V regulation point, the maximum continuous reverse current is limited by power dissipation: 275 mW ÷ 9.1 V ≈ 30 mA at 25 °C ambient. Derating applies above 25 °C per the 455 K/W thermal resistance.

Does Pin 2 require PCB connection or grounding?

No-Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet and has no internal bond wire or die connection. It must remain electrically floating and unconnected on the PCB; soldering or routing to ground or any net will compromise device integrity and reliability.

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

A +5.5 mV/K coefficient means the Zener voltage increases by 5.5 mV per degree Celsius rise in junction temperature. Over a 100 °C range (−25 °C to +75 °C), this produces ~550 mV total drift-approximately ±6 % of 9.1 V. For stable references, thermal management or compensation circuitry is required to mitigate this effect.

Can this part be used in place of a BZX84-C9V1 in existing designs?

Yes-BZX84W-C9V1X is the SOT323 (SC-70) variant of the legacy BZX84-C9V1 in SOT23. Both share identical electrical specs (9.1 V ±5 %, 275 mW, etc.), but the W-series uses a smaller footprint and different thermal profile. PCB layout must be updated to SOT323 pad dimensions and reflow profile.