Diodes Incorporated BZT52C3V3-7-F

Overview

BZT52C3V3-7-F from Diodes Incorporated is a surface-mount 3.3 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 95 Ω maximum zener impedance at 5 mA test current and ±5% voltage tolerance (3.1–3.5 V), widely used for voltage regulation and overvoltage protection in low-power DC rails.

For engineers reviewing the BZT52C3V3-7-F datasheet, BZT52C3V3-7-F pinout, BZT52C3V3-7-F application, or BZT52C3V3-7-F equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOD123 terminal mapping, automotive-grade AEC-Q101 qualification status, and direct alternatives with documented voltage and impedance differences.

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, while the SOD123 package supports automated placement and provides 338 °C/W junction-to-ambient thermal resistance on FR-4 PCB with 1-inch copper pad.

The device exhibits a negative temperature coefficient of −3.5 mV/°C near 3.3 V, enabling predictable drift compensation in bias networks. Reverse leakage is limited to 5.0 µA at VR = 1.0 V, and it sustains 1.0 mA zener test current with low dynamic impedance-critical for noise-sensitive analog references and precision clamping.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking, 0.010 g weight, UL 94V-0 flammability rating, and matte tin-plated alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F, BZT52C3V3-7-F offers lower cost and smaller SOD123 footprint but trades off dynamic impedance and test-current alignment; versus 1N4728A-T, it sacrifices power headroom and thermal robustness for modern SMT manufacturability and AEC-Q101 compliance.

Availability

BZT52C3V3-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, low-power sensor biasing, and industrial I/O conditioning requiring stable component supply and automotive-grade reliability.

Supply support for BZT52C3V3-7-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 the Americas.

The BZT52C series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-yield voltage regulation and protection in consumer, computing, and automotive electronics.

FAQ

What is the maximum reverse voltage (VR) at which BZT52C3V3-7-F guarantees IR ≤ 5.0 µA?

The datasheet specifies 5.0 µA maximum reverse current at VR = 1.0 V. This value is measured under short-duration pulse conditions to minimize self-heating, and applies strictly at TA = +25°C. At higher temperatures or longer durations, leakage increases predictably due to semiconductor physics-designers must apply derating curves for elevated ambient or pulsed operation.

Can BZT52C3V3-7-F be used in place of a 3.3 V LDO for voltage regulation?

No-it functions as a shunt regulator, not a series regulator. It sinks excess current to maintain voltage, requiring a series current-limiting resistor and dissipating power as heat. Unlike an LDO, it cannot source load current or provide low-noise, high-PSRR regulation. It is appropriate only for low-current biasing, clamping, or reference applications-not powering active loads.

Is the SOD123 package of BZT52C3V3-7-F compatible with standard 0805 reflow profiles?

Yes-the SOD123 outline matches JEDEC MS-012 and is dimensionally compatible with 0805 land patterns (2.65 mm × 1.55 mm body). Its matte tin finish meets J-STD-020 moisture sensitivity Level 1, allowing unlimited floor life and standard Pb-free reflow profiles (peak 260°C, 60 sec max). Pad layout recommendations are published by Diodes Incorporated.

Does BZT52C3V3-7-F meet automotive qualification standards?

Yes-the "-7-F" suffix denotes commercial grade, but the underlying BZT52C3V3 die is AEC-Q101 qualified per the DS18004 datasheet. For automotive production use, specify the "Q"-suffixed variant (e.g., BZT52C3V3Q-7-F), which undergoes additional lot-level stress testing and traceability controls aligned with IATF 16949 requirements.