Diodes Incorporated BZT52C43-7

Overview

BZT52C43-7 from Diodes Incorporated is a surface-mount 43 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with ±5% nominal voltage tolerance (40.0–46.0 V), 100 Ω maximum Zener impedance at 5 mA, and 0.1 µA maximum reverse leakage at 32.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.

For engineers reviewing the BZT52C43-7 datasheet, BZT52C43-7 pinout, BZT52C43-7 application, or BZT52C43-7 equivalent, key selection criteria include its 43 V nominal Zener voltage, SOD123 footprint compatibility, AEC-Q101 qualification for automotive use, thermal resistance (RθJA = 338 °C/W), and low leakage performance under reverse bias.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under controlled current conditions. Its planar die construction ensures consistent breakdown characteristics, while the matte tin–plated Alloy 42 leadframe supports reliable solderability per MIL-STD-202.

The device exhibits a negative temperature coefficient of –3.5 mV/°C near 43 V and is characterized with 5 mA test current (IZT) and 1 mA knee current (IZK). Its 100 pF typical capacitance at 1 V reverse bias makes it suitable for low-frequency stabilization-not RF bypassing.

Key Specifications

Pinout & Package

Package: SOD123 - molded plastic case, UL 94V-0 flammability rating, moisture sensitivity level 1 per J-STD-020, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5243B-7-F and 1N4749A, BZT52C43-7 offers optimal balance of SMD compatibility, AEC-Q101 compliance, and 370 mW power capability in compact SOD123-making it the preferred choice for automotive and space-constrained industrial designs requiring validated reliability.

Availability

BZT52C43-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and consumer power adapter feedback circuits requiring stable component supply with full traceability and lifecycle continuity.

Supply support for BZT52C43-7 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.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for medium-current voltage regulation and overvoltage protection in commercial and automotive applications with emphasis on manufacturability and environmental compliance.

FAQ

What is the maximum reverse voltage (VR) at which BZT52C43-7 guarantees ≤0.1 µA leakage?

The datasheet specifies 0.1 µA maximum reverse current (IR) at VR = 32.0 V. This value is measured under steady-state DC conditions at TA = +25°C and defines the upper limit of reverse bias before significant leakage begins-critical for low-power standby circuits where quiescent current must remain below 100 nA.

Can BZT52C43-7 be used in place of a 43 V Zener in an AEC-Q200 qualified system?

No-BZT52C43-7 is qualified to AEC-Q101 (for discrete semiconductors), not AEC-Q200 (for passive components). While its AEC-Q101 qualification covers stress tests like HTGB and temperature cycling, full AEC-Q200 compliance requires additional passive-specific testing such as vibration and humidity resistance not applicable to this Zener diode.

How does the 338 °C/W RθJA value translate to practical PCB layout requirements?

A RθJA of 338 °C/W means that with 370 mW dissipation at TA = +25°C, the junction temperature reaches ~150°C-near its absolute maximum. To stay within safe margins, designers must use ≥1 inch² of 1 oz copper pour connected to both pins, avoid narrow traces, and ensure no adjacent heat sources exceed +75°C ambient at the diode location.

Is the cathode band orientation consistent across all BZT52Cxx-7 reels?

Yes-the cathode band is always located at the same end of the SOD123 package per Diodes Incorporated's mechanical drawing DS18004 Rev. 38-2, and reel packaging maintains consistent tape orientation. Visual inspection under 10× magnification confirms the band aligns with Pin 1 (cathode) in all production lots marked "WU" per the Electrical Characteristics Table.