Diodes Incorporated BZX84C24-7-F

Overview

BZX84C24-7-F from Diodes Incorporated is a 350 mW surface-mount Zener diode with a nominal zener voltage of 24 V, ±5% tolerance (22.8–25.6 V), 70 Ω dynamic impedance at 5 mA test current, and 0.1 µA maximum reverse leakage at 16.8 V. It operates within –65 °C to +150 °C and is used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C24-7-F datasheet, BZX84C24-7-F pinout, BZX84C24-7-F application, or BZX84C24-7-F equivalent, key selection criteria include zener voltage stability under 5 mA bias, thermal resistance of 357 °C/W (on thermally optimized pad), SOT23 package compatibility with automated pick-and-place, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode employs planar die construction for stable breakdown characteristics and low temperature coefficient (–3.5 mV/°C). Its 350 mW power rating is valid only when terminals are held at ambient temperature, and derating begins above 50 °C per the published curve.

It exhibits 70 Ω zener impedance at I_ZT = 5 mA and 250 Ω at knee current I_ZK = 1 mA, confirming sharp knee behavior suitable for reference and clamping. Reverse leakage remains ≤0.1 µA up to 16.8 V, enabling low-current biasing in battery-powered sensor interfaces.

Key Specifications

Pinout & Package

Package: SOT23 - molded plastic case, UL 94V-0 rated, matte tin-plated alloy 42 leadframe, polarity indicated by cathode band on top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5245B-7-F and BZX84-C24,115, the BZX84C24-7-F delivers higher power handling (350 mW vs. ≤300 mW), lower dynamic impedance (70 Ω vs. ≥80 Ω), and certified automotive reliability-making it the optimal choice for thermally constrained or safety-critical 24 V regulation.

Availability

BZX84C24-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, low-power IoT nodes, and medical diagnostic equipment requiring stable component supply and AEC-Q101 assurance.

Supply support for BZX84C24-7-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' precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in space-constrained, thermally demanding applications.

FAQ

What is the maximum continuous reverse voltage the BZX84C24-7-F can withstand without breakdown?

The BZX84C24-7-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. It begins regulating at the lower end of this range and maintains stable conduction up to its power limit. Applying more than 25.6 V continuously without current limiting will exceed its 350 mW rating and cause thermal failure.

Can BZX84C24-7-F be used in place of a 24 V Zener diode with different packaging?

Yes-if the alternative uses SOT23 packaging and shares identical electrical specs (24 V ±5%, 350 mW, AEC-Q101). However, SOD-123 or DO-35 versions differ in thermal resistance (R_θJA ≈ 500 °C/W vs. 357 °C/W) and mounting compatibility, requiring layout revision and derating verification before substitution.

Does the BZX84C24-7-F require a series resistor in all applications?

Yes-a current-limiting resistor is mandatory to prevent thermal runaway. For example, with a 28 V supply and target 5 mA zener current, a 820 Ω resistor limits power dissipation to 205 mW. The resistor value must be recalculated based on worst-case supply voltage, temperature drift, and required regulation accuracy.

How does the –3.5 mV/°C temperature coefficient affect circuit performance?

The negative temperature coefficient causes the zener voltage to decrease by 3.5 mV per degree Celsius rise. In a 24 V reference, this yields ~0.84 V drop over a 240 °C range-so over the rated –65 °C to +150 °C junction range, output shifts ~0.75 V. Compensation is needed in precision references via series thermistors or digital calibration.