Diodes Incorporated BZX84C24Q-7-F

Overview

BZX84C24Q-7-F from Diodes Incorporated is an automotive-grade 24 V, 5 mA Zener diode in SOT23 package with 350 mW power dissipation, ±4.2% voltage tolerance (22.8–25.6 V), and 70 Ω dynamic impedance at test current-used for precision voltage regulation and overvoltage protection in automotive body control modules.

For engineers reviewing the BZX84C24Q-7-F datasheet, BZX84C24Q-7-F pinout, BZX84C24Q-7-F application, or BZX84C24Q-7-F equivalent, key selection criteria include Zener voltage accuracy at 5 mA, thermal resistance of 357 °C/W under ambient-terminated conditions, AEC-Q101 qualification, and SOT23-compatible footprint for high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across load variations and supply fluctuations. Its planar die construction ensures consistent breakdown characteristics and low leakage (<0.1 µA at 16.8 V), while the matte tin–plated Alloy 42 leadframe supports reliable solderability per MIL-STD-202.

The device exhibits a negative temperature coefficient of −3.5 mV/°C near 24 V, enabling predictable drift compensation in temperature-sensitive references. It is rated for operation from −65 °C to +150 °C and meets halogen- and antimony-free "Green" requirements with <900 ppm bromine/chlorine and <1000 ppm antimony.

Key Specifications

Pinout & Package

Package: SOT23 - molded plastic case, UL 94V-0 flammability rating, moisture sensitivity level 1 per J-STD-020, matte tin–plated terminals on Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5249B-TP and BZX84-C24-7-F, BZX84C24Q-7-F uniquely combines AEC-Q101 qualification, tighter voltage tolerance, and automotive traceability-making it the only option for functional-safety–aligned 24 V regulation in ISO 26262-compliant systems.

Availability

BZX84C24Q-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, telecom power supervision, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX84C24Q-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets.

The BZX84 series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage regulation, transient suppression, and reference generation in harsh-environment electronic control units.

FAQ

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

The BZX84C24Q-7-F has a nominal Zener voltage of 24 V with a guaranteed range of 22.8 V to 25.6 V at 5 mA test current. Its absolute maximum reverse voltage is defined by its breakdown characteristic-not a fixed "withstand" limit-and it begins regulating at the lower end of that range. Sustained operation above 25.6 V will increase power dissipation beyond ratings unless current is strictly limited by external series resistance.

Is this part suitable for use in a 24 V automotive power supply with load dump transients?

Yes-BZX84C24Q-7-F is AEC-Q101 qualified and rated for operation from −65 °C to +150 °C, making it appropriate for automotive environments. However, it must be used with a current-limiting resistor to handle load dump transients (e.g., ISO 7637-2 Pulse 5a, up to 60 V/100 ms); alone, it cannot absorb high-energy surges but effectively clamps post-resistor voltage to ~24 V.

How does the −3.5 mV/°C temperature coefficient affect circuit design?

The negative temperature coefficient means the Zener voltage decreases by 3.5 mV per degree Celsius rise. In precision references, this drift must be compensated-either via complementary components (e.g., forward-biased diodes) or by selecting operating points where drift cancels other sources. For non-critical regulation, the effect remains within ±120 mV over −40 °C to +125 °C ambient.

Can this Zener replace a BZX84C24-7-F in an existing design?

Yes-BZX84C24Q-7-F shares identical electrical specifications and SOT23 footprint with BZX84C24-7-F, differing only in AEC-Q101 qualification and traceability documentation. No layout or schematic changes are needed, but qualification status must be verified against functional safety requirements (e.g., ASIL-B compliance) before substitution in automotive systems.