Diodes Incorporated BZX84C4V3Q-13-F

Overview

BZX84C4V3Q-13-F from Diodes Incorporated is a 4.3 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 5 mA test current with ±0.3 V tolerance (4.0–4.6 V), 90 Ω dynamic impedance at I_ZT, and −3.5 mV/°C temperature coefficient. It provides precision voltage regulation and overvoltage clamping in low-power analog monitoring circuits.

For engineers reviewing the BZX84C4V3Q-13-F datasheet, BZX84C4V3Q-13-F pinout, BZX84C4V3Q-13-F application, or BZX84C4V3Q-13-F equivalent, key selection criteria include Zener voltage accuracy at 5 mA, thermal resistance (357 °C/W), automotive-grade AEC-Q101 qualification, reverse leakage (<3.0 µA at 1.0 V), and SOT23 terminal configuration for high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage, while the matte tin–plated Alloy 42 leadframe guarantees solderability per MIL-STD-202.

The device is characterized at 25 °C with 5 mA test current and exhibits a nominal −3.5 mV/°C temperature coefficient - enabling predictable drift compensation in voltage-reference designs. Its 350 mW power rating applies when terminals are held at ambient temperature, with derating required above 25 °C per Figure 1.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal surface-mount plastic case, UL 94V-0 rated, 0.008 g weight, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ4685-7-F and BZX84-C4V3-13-F, BZX84C4V3Q-13-F delivers verified automotive reliability, tighter thermal resistance (357 vs. ≥417 °C/W), and lower Zener impedance - making it the sole option for safety-critical voltage references in AEC-Q100-compliant systems.

Availability

BZX84C4V3Q-13-F is available at Aetrix Electronics and suitable for automotive sensor modules, industrial ADC reference networks, and battery-powered medical monitors requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX84C4V3Q-13-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 device belongs to the BZX84C series of automotive-qualified Zener diodes, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment electronics including ADAS sensors, engine control units, and industrial PLC I/O modules.

FAQ

What is the maximum reverse voltage (V_R) before significant leakage occurs?

At 1.0 V reverse bias, maximum reverse current is 3.0 µA - confirming stable blocking behavior well below the 4.3 V Zener threshold. This low leakage enables reliable operation in high-impedance bias networks where current draw must remain below 5 µA across −40 to +125 °C.

Can this Zener be used in series for higher-voltage references?

Yes - the BZX84C4V3Q-13-F supports series stacking with identical units to achieve integer multiples of 4.3 V (e.g., two in series yield ~8.6 V), provided current matching is ensured via equal series resistors and thermal coupling is minimized to avoid mismatched TC effects.

Is the SOT23 pinout compatible with standard PCB footprints for Zener diodes?

Yes - Pin 1 (Anode) and Pin 2 (Cathode) follow JEDEC-standard SOT23 orientation, matching common layout libraries. Pin 3 is internally unconnected and may be left floating or tied to ground for mechanical stability without affecting electrical performance.

How does the −3.5 mV/°C temperature coefficient impact accuracy over temperature?

Over a −40 to +125 °C range, the total drift is approximately −577 mV, resulting in a 4.3 V reference shifting from 4.58 V to 3.99 V. For high-accuracy applications, this requires either TC compensation circuitry or selection of a Zener with near-zero TC (e.g., 6.2–6.8 V types).