Diodes Incorporated BZX84B5V1-7-F

Overview

BZX84B5V1-7-F from Diodes Incorporated is a precision 5.1 V ±2% Zener diode in SOT23 package, rated for 350 mW power dissipation at 25°C ambient, with 60 Ω dynamic impedance at 5 mA test current and 2.0 µA maximum reverse leakage at 2.0 V. It serves as a voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and ESD-protected sensor interfaces.

For engineers reviewing the BZX84B5V1-7-F datasheet, BZX84B5V1-7-F pinout, BZX84B5V1-7-F application, or BZX84B5V1-7-F equivalent, key selection criteria include its tight 5.1 V tolerance, low 60 Ω Zener impedance, AEC-Q101 qualification for automotive use, and SOT23 footprint compatibility with high-volume automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 5.1 V at 5 mA test current (IZT), exhibiting a temperature coefficient of –2.7 mV/°C below 5.6 V and +1.2 mV/°C above, resulting in near-zero TC at 5.1 V. Its 60 Ω impedance at IZT ensures stable regulation under moderate load variation.

The device is qualified to AEC-Q101 for automotive reliability and features a 350 mW power rating under free-air conditions, derating linearly above 25°C ambient per the published curve. Its SOT23 package supports surface-mount reflow and conforms to J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal plastic molded case, 0.008 g weight, UL 94V-0 flammability rating, matte tin-plated leads on Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5221BS-7-F and BZX84-C5V1-7-F, the BZX84B5V1-7-F delivers superior voltage accuracy (±2% vs. ±5%), higher power handling (350 mW vs. 225–300 mW), and verified automotive qualification-making it the preferred choice for safety-critical or thermally constrained designs.

Availability

BZX84B5V1-7-F is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor signal chains, and medical-grade power supply feedback requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX84B5V1-7-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.

The BZX84B series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and clamping in automotive, industrial, and communications systems where tight tolerance and AEC-Q101 validation are mandatory.

FAQ

What is the maximum steady-state power dissipation for BZX84B5V1-7-F at 75°C ambient?

At 75°C ambient, the device's power dissipation must be derated linearly from 350 mW at 25°C using the 357 °C/W thermal resistance. The allowable power is 350 mW × (1 − (75 − 25)/357) = approximately 278 mW. This value assumes no PCB copper heatsinking beyond the standard FR-4 layout.

Does BZX84B5V1-7-F have a functional third pin in the SOT23 package?

No. Pin 3 in the SOT23 package is an internal die attach pad with no electrical connection. It is thermally coupled to the silicon die but electrically isolated - no external circuit connection is required or recommended.

How does the temperature coefficient behave around 5.1 V, and why is it advantageous?

The temperature coefficient crosses zero near 5.1 V due to opposing contributions from the Zener and avalanche mechanisms. At this voltage, the net TC is minimized (–2.7 mV/°C below, +1.2 mV/°C above), yielding <±0.5 mV/°C drift over 0–50°C - ideal for stable voltage references in unregulated environments.

Can BZX84B5V1-7-F replace BZX84-C5V1 in an existing design?

Yes, with caveats: both share identical SOT23 pinout and 5.1 V nominal voltage, but BZX84B5V1-7-F offers ±2% tolerance (vs. ±5%), 350 mW rating (vs. 300 mW), and AEC-Q101 qualification. No layout change is needed, but verify thermal margin and whether automotive qualification adds value to the application.