Nexperia USA Inc. BZX8450-C16-QVL

Overview

BZX8450-C16-Q from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers a nominal 16 V regulation at 50 µA test current, with ±5 % tolerance, 200 mA maximum forward current, and 250 mW total power dissipation.

For engineers reviewing the BZX8450-C16-Q datasheet, BZX8450-C16-Q pinout, BZX8450-C16-Q application, or BZX8450-C16-Q equivalent, this device is selected for low-quiescent-current voltage stabilization in battery-powered sensors, ECU reference rails, and automotive infotainment power management where AEC-Q101 qualification and thermal robustness are required.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 15.2 V to 16.8 V at I_Z = 50 µA. Its differential resistance is ≤200 Ω at I_Z = 5 mA, and temperature coefficient is +10.4 mV/K - enabling stable reference performance across −55 °C to +150 °C ambient range.

It features intentional minor leakage current optimization per AN90031 for fast switching and reduced noise in signal conditioning paths. Qualified to AEC-Q101, it supports automotive-grade reliability with junction temperature up to 150 °C and non-repetitive surge capability of 40 W (100 µs pulse).

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 mounting footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C16 and MMSZ5245B, the BZX8450-C16-Q uniquely combines AEC-Q101 qualification, 50 µA test current specification, and intentional leakage tuning - making it the sole option for automotive-grade, low-bias, low-noise Zener references in space-constrained SOT23 layouts.

Availability

BZX8450-C16-Q is available at Aetrix Electronics and suitable for automotive body control modules, portable medical sensor nodes, industrial PLC analog input cards, and smart home smoke detectors requiring stable component supply with guaranteed long-term continuity.

Supply support for BZX8450-C16-Q 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 specializing in high-performance, reliable discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

The BZX8450-Q series belongs to Nexperia's automotive-grade Zener regulator product line, engineered specifically for low-current, high-stability voltage reference and clamping in harsh-environment electronics such as engine control units and ADAS subsystems.

FAQ

What is the maximum reverse voltage this Zener can regulate before breakdown?

The BZX8450-C16-Q has a nominal Zener voltage of 16 V, with a guaranteed working range of 15.2 V to 16.8 V at I_Z = 50 µA. Its absolute maximum reverse voltage before irreversible damage is defined by the limiting value VR = 16 V (non-repetitive peak) - exceeding this risks permanent degradation. The device is not rated for continuous operation above its specified V_Z range.

Can Pin 2 be used as a thermal pad or grounded for EMI reduction?

No - Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet and has no internal die connection. Using it as a thermal pad or ground path violates the SOT23 mechanical and electrical design, risks solder bridging, and provides no thermal or EMI benefit. Thermal performance relies solely on the cathode (Pin 3) solder point per R_th(j-sp) = 330 K/W specification.

How does the +10.4 mV/K temperature coefficient affect accuracy in a 0–70 °C operating range?

With a +10.4 mV/K coefficient, the Zener voltage shifts +728 mV over a 70 °C span (10.4 mV/K × 70 K). At 16 V nominal, that equals +4.55 % drift - but actual variation is bounded by the ±5 % initial tolerance and tested TC curve. For precision applications, this necessitates either temperature compensation or system-level calibration, especially in unregulated ambient environments.

Is this device suitable for replacing a 1N4744A in an existing design?

No - the 1N4744A is a 14 V, 1 W through-hole Zener with 1000 Ω dynamic impedance and no automotive qualification. BZX8450-C16-Q is a 16 V, 250 mW SOT23 device with 200 Ω impedance, AEC-Q101 rating, and 50 µA test current. Direct replacement would cause overvoltage, insufficient power handling, and potential thermal failure; redesign of bias network and layout is required.