Nexperia USA Inc. BZX84-A9V1,215

Overview

BZX84-A9V1,215 from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and regulation in space-constrained PCBs. It delivers 9.1 V nominal breakdown voltage at 5 mA, with 100 Ω typical differential resistance, 0.5 μA max reverse current at 7.2 V, and operates across –55 °C to +150 °C ambient range - used in power supply feedback loops, overvoltage clamping, and analog reference circuits.

For engineers reviewing the BZX84-A9V1,215 datasheet, BZX84-A9V1,215 pinout, BZX84-A9V1,215 application, or BZX84-A9V1,215 equivalent, this page provides verified electrical parameters, thermal behavior, SOT23 terminal mapping, real-world use cases, and validated alternative parts for design-in and BOM optimization.

Technical Context

This device functions as a two-terminal silicon Zener diode operating in reverse-biased breakdown mode, with tightly controlled 9.1 V ±1 % tolerance at I_Z = 5 mA. Its temperature coefficient is +3.8 mV/K at 5 mA, indicating positive drift with junction temperature rise - critical for stable biasing in temperature-varying environments.

The SOT23 package enables surface-mount integration with R_th(j-a) = 500 K/W (free air) and R_th(j-sp) = 330 K/W (to cathode solder point), supporting ≤250 mW continuous dissipation at T_amb ≤ 25 °C on standard FR4 PCBs. Non-repetitive surge capability reaches 3.0 A peak reverse current (100 μs pulse).

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with standard footprint per Figure 12 (reflow) and Figure 13 (wave soldering); dimensions per Figure 11 (1.9 mm × 1.1 mm × 1.0 mm height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-A9V1,215, the BZX84-B9V1,215 trades 1 % tolerance for lower unit cost while maintaining identical surge and thermal performance; MMBZ5240BS-7-F offers broader availability but sacrifices regulation precision and dynamic impedance - making it unsuitable for feedback-critical applications.

Availability

BZX84-A9V1,215 is available at Aetrix Electronics and suitable for power supply feedback regulation, overvoltage clamp protection, and analog sensor bias reference requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for BZX84-A9V1,215 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 technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage regulation and reference applications where tight tolerance, low leakage, and robust surge capability are mandatory in compact SMT packages.

FAQ

What is the maximum continuous reverse current this diode can handle at 25 °C ambient?

The BZX84-A9V1,215 is rated for 250 mW total power dissipation at T_amb ≤ 25 °C. At its 9.1 V breakdown voltage, this corresponds to a maximum continuous reverse current of approximately 27.5 mA (250 mW ÷ 9.1 V). Exceeding this value risks thermal runaway unless board-level cooling is enhanced.

Does Pin 2 have any internal connection or function?

No - Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is an unconnected lead tied to no internal die structure. PCB layout must leave this pad floating; connecting it may introduce parasitic capacitance or leakage paths that degrade regulation stability.

How does the +3.8 mV/K temperature coefficient affect circuit performance?

The +3.8 mV/K coefficient means the breakdown voltage increases by 3.8 mV per Kelvin rise in junction temperature. At a 50 °C ΔT above ambient, V_Z rises by ~190 mV - a key factor in high-temperature applications like motor drives. This drift is linear and predictable, enabling software-based compensation in digital systems.

Can this Zener be used in forward-bias mode as a standard diode?

Yes - its forward voltage is specified at 0.9 V max at 10 mA, matching typical silicon diode behavior. However, it lacks optimized forward characteristics (e.g., fast recovery, low Q_rr) and is not characterized for switching applications. Use only for low-frequency, low-current forward conduction where regulation-grade leakage and capacitance are acceptable.