Diodes Incorporated BZX84C3V3Q-7-F

Overview

BZX84C3V3Q-7-F from Diodes Incorporated is an automotive-grade 3.3 V, 5 mA Zener diode in SOT23 package, rated for 350 mW power dissipation and −3.5 mV/°C temperature coefficient, used for precision voltage regulation and overvoltage protection in low-power analog rails and sensor biasing circuits.

For engineers reviewing the BZX84C3V3Q-7-F datasheet, BZX84C3V3Q-7-F pinout, BZX84C3V3Q-7-F application, or BZX84C3V3Q-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±0.2 V), low dynamic impedance (95 Ω at 5 mA), AEC-Q101 qualification, and SOT23 thermal resistance (357 °C/W).

Technical Context

This Zener diode operates in reverse breakdown with tightly controlled voltage regulation at I_ZT = 5.0 mA. Its planar die construction ensures stable Zener characteristics across temperature and lifetime, and its −3.5 mV/°C temperature coefficient enables predictable drift compensation in reference circuits.

The device exhibits low leakage (5.0 µA max at 1.0 V reverse) and low capacitance (~100 pF at 1 V), making it suitable for noise-sensitive signal conditioning and low-current bias networks where minimal parasitic loading is required.

Key Specifications

Pinout & Package

Package: SOT23 - three-terminal plastic-molded case with matte tin-plated alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F, BZX84C3V3Q-7-F delivers higher power handling and automotive qualification; compared with BZX84-C3V3,315, it offers identical performance in smaller 3,000-piece reels optimized for prototyping and mid-volume builds.

Availability

BZX84C3V3Q-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference generation, and USB port overvoltage clamping requiring stable component supply with full traceability and lifecycle management.

Supply support for BZX84C3V3Q-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, specializing in high-reliability components for automotive, industrial, and computing markets.

This part belongs to the BZX84C series of automotive-qualified Zener diodes, designed specifically for precision voltage regulation and transient suppression in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C3V3Q-7-F?

The nominal Zener voltage is 3.3 V with a guaranteed range of 3.1 V to 3.5 V at 5 mA test current. Breakdown occurs sharply within this band; operation below 3.1 V yields negligible reverse current (<5 µA at 1.0 V), and exceeding 3.5 V risks exceeding power limits unless current is strictly limited by series resistance.

Is BZX84C3V3Q-7-F suitable for use in a 5 V rail clamp configuration?

No - its 3.3 V Zener voltage makes it unsuitable as a 5 V rail clamp. At 5 V reverse bias, it would conduct heavily (well beyond 5 mA), risking thermal runaway unless series resistance limits current to ≤100 mA. For 5 V clamping, BZX84C5V1Q-7-F (5.1 V) or BZX84C5V6Q-7-F (5.6 V) are appropriate alternatives.

How does the −3.5 mV/°C temperature coefficient affect long-term stability?

Over a −40°C to +125°C range, the Zener voltage shifts by approximately −577 mV total (165°C × −3.5 mV/°C), resulting in a 3.3 V nominal drifting to ~2.72 V. In practice, this is compensated by pairing with positive-tempco components or using it in closed-loop feedback where drift is rejected - not used standalone for absolute voltage references above 85°C.

Can BZX84C3V3Q-7-F replace a 3.3 V LDO regulator in low-current applications?

No - it lacks regulation regulation loop, dropout control, or current limiting. It provides voltage reference only when reverse-biased with externally limited current. Unlike an LDO, it cannot source load current or maintain regulation under varying load; it is strictly a shunt reference or clamp, not a series regulator.