Diodes Incorporated BZX84C4V7-7-F

Overview

BZX84C4V7-7-F from Diodes Incorporated is a 4.7 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 5 mA test current with 80 Ω dynamic impedance at 1 kHz and ±3.0 µA reverse leakage at 2.0 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the BZX84C4V7-7-F datasheet, BZX84C4V7-7-F pinout, BZX84C4V7-7-F application, or BZX84C4V7-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±0.3 V), thermal resistance (357 °C/W), RoHS/Green compliance, AEC-Q101 qualification status, and SOT23 terminal layout compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations, with temperature coefficient near 0 mV/°C at 4.7 V, enabling low-drift reference performance in ambient ranges from –65 °C to +150 °C.

Its planar die construction ensures consistent Zener characteristics and low capacitance (≈25 pF at 1 V reverse bias), while matte tin-plated Alloy 42 leads provide reliable solderability per MIL-STD-202, Method 208.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic case with 3 terminals, UL 94V-0 flammability rating, moisture sensitivity level 1, weight ≈0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ4685-7-F and BZX84-C4V7,115, BZX84C4V7-7-F delivers higher power handling (350 mW vs. 200 mW), lower impedance (80 Ω vs. 100 Ω), and certified AEC-Q101 reliability - making it preferred for automotive and industrial applications demanding long-term voltage stability under thermal stress.

Availability

BZX84C4V7-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and medical wearable power management requiring stable component supply and full traceability.

Supply support for BZX84C4V7-7-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.

The BZX84 series belongs to Diodes' precision Zener diode product line, engineered for voltage regulation, reference, and protection in space-constrained, high-reliability applications including automotive, industrial, and computing systems.

FAQ

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

The BZX84C4V7-7-F has a nominal Zener voltage of 4.7 V with a specified range of 4.4 V to 5.0 V at 5 mA test current. It begins controlled reverse breakdown within this band and is not rated for sustained operation above 5.0 V in regulation mode. Absolute maximum reverse voltage is not defined separately - operation beyond the Zener range risks thermal runaway if power limits are exceeded.

Is this part qualified for automotive use?

Yes, the BZX84C4V7-7-F is explicitly qualified to AEC-Q101 standards for high-reliability automotive applications. This includes stress testing for temperature cycling, humidity bias, mechanical shock, and accelerated life validation - confirming suitability for under-hood and cabin electronics where extended temperature range (–65 °C to +150 °C) and long-term stability are required.

How does the SOT23 package affect thermal performance?

In the SOT23 package, the BZX84C4V7-7-F achieves a thermal resistance of 357 °C/W (junction-to-ambient) when terminals are held at ambient temperature. On FR-4 PCB with recommended pad layout, R_θJA rises to 417 °C/W. Derating begins above 25 °C ambient - at 70 °C ambient, maximum allowable power drops to ~220 mW to stay within 150 °C junction limit.

Can this Zener diode replace a 5.1 V variant in an existing circuit?

No - substituting BZX84C4V7-7-F for a 5.1 V Zener (e.g., BZX84C5V1) changes the regulation point by 400 mV, which may cause functional failure in circuits relying on precise threshold detection or reference voltage. The 4.7 V unit also exhibits different temperature coefficient (–3.5 mV/°C vs. –2.7 mV/°C) and reverse leakage (3.0 µA vs. 2.0 µA at 2.0 V), altering bias point stability.