Diodes Incorporated BZX84B24-7-F

Overview

BZX84B24-7-F from Diodes Incorporated is a precision 24 V ±2% Zener diode in SOT23 package, rated for 350 mW power dissipation at 25°C ambient, with 70 Ω dynamic impedance at 5 mA test current and 0.1 µA maximum reverse leakage at 16.8 V. It serves as a stable voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and sensor biasing networks.

For engineers reviewing the BZX84B24-7-F datasheet, BZX84B24-7-F pinout, BZX84B24-7-F application, or BZX84B24-7-F equivalent, key selection criteria include its tight 2% Zener tolerance, AEC-Q101 qualification for automotive use, SOT23 surface-mount compatibility with automated assembly, and verified thermal resistance of 357 °C/W under lead-free soldering conditions.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 24 V at 5 mA test current (IZT), exhibiting a positive temperature coefficient of +18.4 mV/°C above 12 V-enabling predictable drift compensation in temperature-sensitive references. Its 70 Ω Zener impedance at IZT and 250 Ω at knee current (IZK = 1 mA) ensures stable regulation under varying load conditions.

The device is constructed using planar epitaxial process technology, features matte tin-plated Alloy 42 leads, and meets J-STD-020 moisture sensitivity Level 1. Its SOT23 package supports thermal derating to 0 mW at 150°C ambient per the defined power derating curve, with junction-to-ambient thermal resistance of 357 °C/W when terminals are held at ambient temperature.

Key Specifications

Pinout & Package

Package: SOT23 - molded plastic case with UL 94V-0 flammability rating, 0.008 g mass, and moisture sensitivity Level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5242B-7-F and BZX84-C24, BZX84B24-7-F delivers tighter 2% tolerance, AEC-Q101 qualification, and lower Zener impedance-making it the sole choice for automotive and industrial applications demanding long-term voltage stability and traceable reliability.

Availability

BZX84B24-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and low-power IoT node power management requiring stable component supply, RoHS 3 compliance, and AEC-Q101 validation.

Supply support for BZX84B24-7-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

BZX84Bxx belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and clamping in automotive, industrial, and medical applications where tight tolerance and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum reverse voltage before breakdown for BZX84B24-7-F?

The BZX84B24-7-F exhibits a nominal Zener voltage of 24 V at 5 mA test current, with guaranteed breakdown occurring between 23.5 V and 24.5 V. Below 16.8 V, reverse leakage remains ≤0.1 µA; sustained operation above 24.5 V risks exceeding its 350 mW power limit unless current is strictly limited by external series resistance.

Can BZX84B24-7-F be used in place of a 24 V Zener with ±5% tolerance?

Yes, but only where tighter regulation improves system performance. Its ±2% tolerance reduces worst-case voltage deviation from ±1.2 V (±5%) to ±0.48 V, directly improving ADC reference accuracy and reducing calibration burden in sensor interfaces-though it requires verifying that the lower Zener impedance (70 Ω vs. ~100 Ω) does not destabilize feedback loops.

Is the SOT23 package of BZX84B24-7-F compatible with standard reflow profiles?

Yes-the device is qualified for lead-free reflow per J-STD-020 Level 1, with a maximum peak temperature of 260°C and 60-second duration above 217°C. Its matte tin finish and Alloy 42 leadframe ensure reliable wetting and intermetallic formation without voiding or dewetting on standard FR-4 PCBs using recommended pad layout dimensions.

Does BZX84B24-7-F require derating at elevated ambient temperatures?

Yes-its 350 mW rating applies only at TA = 25°C. Power must be linearly derated by 2.8 mW/°C above 25°C, reaching 0 mW at 150°C ambient. For operation at 85°C ambient, maximum allowable power is 178 mW, requiring series resistance calculation to limit Zener current accordingly.