Diodes Incorporated BZT52C43Q-7-F

Overview

BZT52C43Q-7-F from Diodes Incorporated is an AEC-Q101 qualified surface-mount Zener diode with a nominal zener voltage of 43 V, ±7% tolerance (40–46 V), 500 mW power dissipation at TL = +75°C, and 370 mW at TA = +25°C, used for precision voltage regulation and overvoltage protection in automotive power rails and sensor interface circuits.

For engineers reviewing the BZT52C43Q-7-F datasheet, BZT52C43Q-7-F pinout, BZT52C43Q-7-F application, or BZT52C43Q-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, low temperature coefficient (±0.1 mV/°C), SOD123 package thermal resistance (RθJA = 338 °C/W), and automotive qualification status per AEC-Q101.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. It exhibits a maximum zener impedance of 100 Ω at 5 mA and 700 Ω at 1 mA, with a typical temperature coefficient of ±0.1 mV/°C near 43 V, ensuring minimal drift across -65°C to +150°C operating range.

The device uses planar die construction in a molded plastic SOD123 case with matte tin-plated alloy 42 leadframe, rated UL 94V-0, moisture sensitivity level 1, and cathode band polarity marking - optimized for high-reliability automotive PCB assembly and reflow soldering.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking, 1.55 mm width, 2.65 mm length, 1.05 mm height, and 0.57 mm lead pitch; designed for automated pick-and-place and IR-reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ43T1G and BZX84-C43, BZT52C43Q-7-F offers superior automotive qualification, lower thermal resistance than SOT-23 alternatives, and tighter process control for consistent 43 V regulation in harsh environments - making it the preferred choice for safety-critical vehicle subsystems.

Availability

BZT52C43Q-7-F is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, LED driver protection, and programmable logic supply monitoring requiring stable component supply and AEC-Q101 compliance.

Supply support for BZT52C43Q-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.

BZT52C43Q-7-F belongs to the BZT52C series of AEC-Q101-qualified Zener diodes, engineered specifically for voltage regulation and transient suppression in automotive power systems and mission-critical industrial interfaces.

FAQ

What is the maximum reverse current for BZT52C43Q-7-F at 32 V?

The maximum reverse current (I_R) is 0.1 µA at V_R = 32 V and T_A = +25°C. This ultra-low leakage ensures minimal power loss in high-impedance reference or monitoring circuits, preserving accuracy in precision analog designs and extending battery life in always-on automotive modules.

Is BZT52C43Q-7-F compatible with lead-free reflow soldering profiles?

Yes - it features matte tin finish annealed over alloy 42 leadframe and is fully RoHS-compliant. The SOD123 package withstands standard IPC/JEDEC J-STD-020 Class 1 (Level 1) moisture sensitivity profile and supports peak reflow temperatures up to 260°C, making it suitable for Pb-free SAC305 processes.

How does the temperature coefficient affect regulation accuracy at 125°C?

With a specified temperature coefficient of ±0.1 mV/°C, the zener voltage shift from 25°C to 125°C is approximately ±10 mV - less than 0.025% of 43 V. This enables stable reference performance in under-hood applications where ambient temperatures exceed 105°C, without requiring external compensation.

Can BZT52C43Q-7-F replace BZT52C43-7-F in existing designs?

Yes - the "Q" suffix denotes AEC-Q101 qualification, while electrical parameters, package dimensions, and marking are identical to the commercial BZT52C43-7-F. No layout or schematic changes are needed; the Q-grade version adds automotive reliability validation without functional trade-offs.