Nexperia USA Inc. BZT52H-A9V1X

Overview

BZT52H-A9V1X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD123F package, rated for 9.1 V nominal breakdown voltage at I_Z = 5 mA, with 830 mW total power dissipation and 100 Ω maximum differential resistance - used for precision low-power voltage reference and overvoltage protection in DC power rails.

For engineers reviewing the BZT52H-A9V1X datasheet, BZT52H-A9V1X pinout, BZT52H-A9V1X application, or BZT52H-A9V1X equivalent, this page delivers verified Zener parameters, thermal performance data, SOD123F mounting guidance, and direct substitution options for stable 9.1 V regulation in space-constrained PCB designs.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 9.1 V output by conducting reverse current above its precise Zener knee. Its ±1 % tolerance and low 100 Ω dynamic impedance ensure tight regulation under varying load conditions.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 830 mW power handling at T_amb ≤ 25 °C and exhibits a positive temperature coefficient of +3.8 mV/K at I_Z = 5 mA - enabling predictable drift compensation in temperature-sensitive references.

Key Specifications

Pinout & Package

SOD123F plastic surface-mount package: 2.5–2.7 mm length × 1.2–1.5 mm width × 0.9–1.1 mm height; cathode marked by bar; optimized for reflow soldering per IPC-7095 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A9V1X, BZT52C9V1 trades ±1 % accuracy and lower impedance for lower unit cost, while MMSZ5240B offers second-source availability but with higher dynamic impedance and looser tolerance - making the A9V1X optimal for new designs demanding 9.1 V stability within ±90 mV.

Availability

BZT52H-A9V1X is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded power management subsystems, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZT52H-A9V1X 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 logic, discrete, and MOSFET solutions - headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The BZT52H series belongs to Nexperia's precision Zener diode product line, engineered specifically for stable voltage reference and clamping in consumer, industrial, and communication equipment where SMD footprint and ±1 % accuracy are critical.

FAQ

What is the maximum reverse current the BZT52H-A9V1X can handle continuously?

The device is rated for continuous Zener current up to 91 mA at 9.1 V (830 mW / 9.1 V), assuming ambient temperature ≤25 °C and proper PCB copper area. Derating is required above 25 °C per the 330 K/W junction-to-ambient thermal resistance - e.g., max I_Z drops to ~65 mA at 50 °C ambient.

How does the ±1 % tolerance affect circuit accuracy in a 9 V power rail monitor?

With ±1 % tolerance, the actual Zener voltage falls between 9.00 V and 9.20 V at 5 mA test current. In a comparator-based monitor, this translates to a detection threshold uncertainty of ±0.1 V - sufficient for detecting >10 % overvoltage (≥9.9 V) while rejecting normal ripple.

Can BZT52H-A9V1X replace BZX84-C9V1 in an existing SOD-123 design?

Yes - both use SOD-123/SOD123F footprints and share identical pinning (cathode bar on Pin 1). However, BZT52H-A9V1X offers tighter ±1 % tolerance and lower 100 Ω r_dif versus BZX84-C9V1's ±5 % and 150 Ω, improving regulation accuracy without layout change.

What is the significance of the +3.8 mV/K temperature coefficient for this Zener?

A +3.8 mV/K coefficient means the Zener voltage increases by 3.8 mV per degree Celsius rise in junction temperature. At 85 °C ambient (assuming 25 °C rise), V_Z rises by ~95 mV - still within ±1 % band (9.00–9.20 V), confirming suitability for industrial temperature ranges without external compensation.