Diodes Incorporated BZT52C4V3-7-F

Overview

BZT52C4V3-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 4.3 V (±7% tolerance), 500 mW power dissipation, and SOD123 package. It regulates voltage in low-power biasing, reference, and overvoltage protection circuits for industrial sensors, power supply feedback loops, and automotive body control modules.

For engineers reviewing the BZT52C4V3-7-F datasheet, BZT52C4V3-7-F pinout, BZT52C4V3-7-F application, or BZT52C4V3-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, dynamic impedance of 90 Ω at I_ZT, reverse leakage of ≤3.0 µA at 1.0 V, temperature coefficient of −3.5 mV/°C, and AEC-Q101 qualification for automotive use.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage, while the SOD123 package supports automated placement and reflow soldering.

The device delivers precise regulation at 4.3 V with ±7% tolerance (4.0–4.6 V range) and exhibits low dynamic impedance (90 Ω at 5 mA), enabling effective noise suppression in analog reference paths. Its negative temperature coefficient (−3.5 mV/°C) allows predictable drift compensation in temperature-sensitive designs.

Key Specifications

Pinout & Package

Package: SOD123 - molded plastic case, cathode band marking, matte tin-plated alloy 42 leadframe, UL 94V-0 rated, 0.010 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5229BS-7-F and BZX84-C4V3, BZT52C4V3-7-F offers superior thermal capability (500 mW vs. ≤350 mW), tighter process control via AEC-Q101 validation, and SOD123 mechanical robustness-making it optimal for automotive and industrial systems demanding long-term voltage stability under thermal stress.

Availability

BZT52C4V3-7-F is available at Aetrix Electronics and suitable for industrial sensor biasing, automotive power supply feedback, and USB port overvoltage protection requiring stable component supply, AEC-Q101 compliance, and RoHS/Green certification.

Supply support for BZT52C4V3-7-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for reliable voltage regulation and clamping in cost-sensitive, high-volume applications across automotive, industrial, and consumer markets.

FAQ

What is the maximum reverse current at 1.0 V for BZT52C4V3-7-F?

The maximum reverse current (I_R) is 3.0 µA at V_R = 1.0 V and T_A = +25°C, per the Electrical Characteristics table in DS18004 Rev. 38-2. This low leakage ensures minimal loading on high-impedance bias networks and preserves accuracy in precision reference applications.

Is BZT52C4V3-7-F suitable for automotive applications?

Yes-BZT52C4V3-7-F is explicitly qualified to AEC-Q101 standards, including stress tests for temperature cycling, humidity, and mechanical shock. Its SOD123 package and green molding compound meet automotive reliability and environmental requirements for body electronics and power management subsystems.

How does the temperature coefficient affect regulation accuracy?

The temperature coefficient is −3.5 mV/°C, meaning the zener voltage decreases by 3.5 mV per degree Celsius rise. Over a −40°C to +125°C range, this results in ~575 mV total drift-designers compensate using complementary TC components or calibration in closed-loop systems where absolute accuracy is critical.

What is the recommended PCB pad layout for SOD123 mounting?

Per Diodes' package outline documentation, the recommended SOD123 pad layout uses X = 0.900 mm, X1 = 4.050 mm, and Y = 0.950 mm dimensions. A 1-inch copper pad is specified for thermal derating per Note 8, and the layout must accommodate the 0.52–0.62 mm lead width and 2.55–2.85 mm body width tolerances.