Diodes Incorporated BZX84B13-7-F

Overview

BZX84B13-7-F from Diodes Incorporated is a precision 13 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at 25°C ambient, with 30 Ω maximum Zener impedance at 5 mA test current and 0.1 µA maximum reverse leakage at 8 V. It serves as a stable voltage reference or overvoltage clamp in low-power analog and digital supply regulation circuits.

For engineers reviewing the BZX84B13-7-F datasheet, BZX84B13-7-F pinout, BZX84B13-7-F application, or BZX84B13-7-F equivalent, key selection criteria include its tight 13.0 V nominal Zener voltage (12.7–13.3 V range), low 7.0 mV/°C temperature coefficient, AEC-Q101 qualification, and SOT23 footprint compatibility with automated PCB assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage under controlled current conditions. Its 5 mA test current and 30 Ω dynamic impedance at that point ensure predictable regulation behavior across production lots and temperature ranges.

The device exhibits a positive temperature coefficient of +7.0 mV/°C near 13 V, enabling predictable drift compensation in multi-diode reference designs. Its 350 mW power rating applies under specified thermal conditions - including lead-free soldering and FR-4 PCB mounting per J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

SOT23 package with cathode-marked top-side orientation; terminals are anode (Pin 1), cathode (Pin 2), and anode (Pin 3) - internally shorted Pins 1 and 3 form the anode connection, Pin 2 is cathode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4685-7-F and BZX84-C13, BZX84B13-7-F delivers superior voltage accuracy (±2% vs. ±5%), lower dynamic impedance, and AEC-Q101 validation - making it the preferred choice for automotive and high-reliability analog references despite slightly lower power rating than MMSZ4685-7-F.

Availability

BZX84B13-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and medical diagnostic instrument power rails requiring stable component supply and long-term lifecycle assurance.

Supply support for BZX84B13-7-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, manufacturing, and sales operations across Asia, Europe, and North America.

This part belongs to the BZX84B series of precision Zener diodes engineered for high-reliability voltage reference and clamping in automotive, industrial, and medical applications demanding tight tolerance and AEC-Q101 compliance.

FAQ

What is the maximum power dissipation of BZX84B13-7-F at 70°C ambient?

At 70°C ambient, the device's power dissipation must be derated linearly from 350 mW at 25°C using the 357 °C/W thermal resistance (Note 6). The allowable power is 350 mW × (1 − (70 − 25)/357) ≈ 295 mW. This assumes terminals remain at ambient temperature per datasheet Note 6.

Is BZX84B13-7-F suitable for use in a 12 V automotive battery monitoring circuit?

Yes - its 13.0 V nominal Zener voltage provides headroom above nominal 12 V systems while clamping transients up to ~15 V. Its AEC-Q101 qualification, -65°C to +150°C operating range, and 0.1 µA leakage at 8 V make it appropriate for direct connection to battery-sensed nodes in BCM and telematics modules.

How does the +7.0 mV/°C temperature coefficient affect circuit performance?

The +7.0 mV/°C coefficient means the Zener voltage increases by approximately 0.7 V over a 100°C rise - e.g., from 13.0 V at 25°C to ~13.7 V at 125°C. This predictable drift allows designers to compensate in reference buffers or select complementary components for zero-TC designs.

Can BZX84B13-7-F replace BZX84-C13 in existing designs?

Yes, with caveats: both share SOT23 package and 13 V nominal voltage, but BZX84B13-7-F offers ±2% tolerance (vs. ±5%), lower Z_ZT (30 Ω vs. 40 Ω), and AEC-Q101 qualification. No layout change is needed, but verify if tighter tolerance improves system accuracy or enables removal of calibration steps.