Diodes Incorporated BZX84C5V1Q-7-F

Overview

BZX84C5V1Q-7-F from Diodes Incorporated is an automotive-grade 5.1 V, 350 mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog circuits. It delivers ±6% zener voltage tolerance at 5 mA test current, 60 Ω dynamic impedance at 5 mA, and -2.7 mV/°C temperature coefficient - enabling stable reference performance across industrial temperature range (-65°C to +150°C) in power supply feedback paths.

For engineers reviewing the BZX84C5V1Q-7-F datasheet, BZX84C5V1Q-7-F pinout, BZX84C5V1Q-7-F application, or BZX84C5V1Q-7-F equivalent, key selection criteria include zener voltage accuracy, thermal stability under ambient variation, junction-to-ambient thermal resistance (357 °C/W), and AEC-Q101 qualification for automotive electronics reliability validation.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal 5.1 V regulation point at 5 mA test current, maintaining tight 4.8–5.4 V tolerance band. Its planar die construction ensures consistent avalanche characteristics and low leakage (<2.0 µA at 2.0 V reverse bias).

Thermal design is enabled by its 357 °C/W junction-to-ambient thermal resistance under free-air conditions and 0.008 g mass, supporting compact PCB layouts without forced cooling. The device exhibits a negative temperature coefficient of -2.7 mV/°C, allowing predictable drift compensation in temperature-sensitive references.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5231B-TP and BZX84-C5V1,115, BZX84C5V1Q-7-F uniquely combines AEC-Q101 qualification, 350 mW dissipation, and 60 Ω impedance - making it optimal for automotive power management where thermal margin and regulation precision coexist under extended temperature stress.

Availability

BZX84C5V1Q-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and consumer power adapter feedback requiring stable component supply with full traceability and lifecycle continuity.

Supply support for BZX84C5V1Q-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 device belongs to the BZX84C automotive Zener diode family, engineered specifically for AEC-Q101-compliant voltage regulation in space-constrained, thermally demanding environments such as engine control units and ADAS subsystems.

FAQ

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

The BZX84C5V1Q-7-F has a nominal zener voltage of 5.1 V at 5 mA test current, with a guaranteed breakdown range of 4.8 V to 5.4 V. It does not specify a distinct "maximum reverse voltage" limit - instead, it enters controlled avalanche conduction within this band. Operation above 5.4 V at rated current risks exceeding 350 mW dissipation unless current is strictly limited by external series resistance.

Is this part suitable for use in a 12 V automotive system's overvoltage protection circuit?

Yes - when used with appropriate series current limiting (e.g., 2.2 kΩ resistor for ~3 mA bias), it clamps transients to ≤5.4 V, protecting downstream 5 V logic. Its AEC-Q101 qualification, -65°C to +150°C operating range, and 350 mW rating make it suitable for under-hood environments subject to load dump and jump-start surges per ISO 7637-2.

How does the -2.7 mV/°C temperature coefficient affect circuit performance?

This negative coefficient means the zener voltage decreases by 2.7 mV per degree Celsius rise in junction temperature. In a 5.1 V reference, that yields ~0.053% per °C drift - acceptable for non-critical biasing but requires compensation (e.g., series positive-TC resistor) in precision references targeting <100 ppm/°C stability.

Can this SOT23 Zener be hand-soldered without damage?

Yes - its moisture sensitivity level 1 allows unlimited floor life, and the 357 °C/W thermal resistance permits safe hand-soldering with a fine-tip iron (<350°C, <3 sec contact). Preheating the board to 100°C reduces thermal shock risk. Avoid repeated rework: each cycle degrades the passivation layer and increases leakage.