Diodes Incorporated BZT52C43-7-F

Overview

BZT52C43-7-F 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 supply regulation circuits.

For engineers reviewing the BZT52C43-7-F datasheet, BZT52C43-7-F pinout, BZT52C43-7-F application, or BZT52C43-7-F equivalent, key selection criteria include its 43 V nominal Zener voltage, 100 Ω dynamic impedance at test current, thermal resistance of 338 °C/W (junction-to-ambient), SOD123 footprint compatibility, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and temperature shifts. Its planar die construction ensures consistent breakdown characteristics, while the matte tin-plated Alloy 42 leadframe guarantees solderability per MIL-STD-202, Method 208.

The device exhibits a negative temperature coefficient of –3.5 mV/°C near 43 V, enabling predictable drift behavior in temperature-sensitive references. Its 0.010 g mass and UL 94V-0 molded plastic case support high-density PCB layouts and automated reflow assembly.

Key Specifications

Pinout & Package

Two-terminal device in SOD123 package: cathode marked by band on body; anode and cathode terminals are unidirectional, with polarity critical for correct Zener operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5243B-7-F and BZX84-C43, BZT52C43-7-F offers superior power handling (370 mW vs. 350/300 mW), tighter Zener tolerance (±5% vs. ±5%/±6%), and AEC-Q101 qualification-making it optimal for automotive and industrial applications demanding long-term voltage stability and thermal robustness.

Availability

BZT52C43-7-F is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and medical battery monitoring systems requiring stable component supply with full traceability and long-lifecycle support.

Supply support for BZT52C43-7-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 North America.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for medium-current voltage regulation and overvoltage protection in cost-sensitive, high-reliability applications including automotive, industrial, and medical electronics.

FAQ

What is the maximum reverse voltage (V_R) at which leakage current is specified for BZT52C43-7-F?

The datasheet specifies 0.1 µA maximum reverse leakage current at V_R = 32.0 V, which is 74.4% of the nominal Zener voltage (43 V). This value is measured under steady-state DC conditions at +25°C ambient and confirms the device's suitability for low-quiescent-current reference designs where standby power must remain below 1 µW.

Can BZT52C43-7-F be used in parallel for higher power dissipation?

No-Zener diodes exhibit negative temperature coefficients and mismatched breakdown voltages, causing current hogging when paralleled. The datasheet does not recommend parallel operation. For higher power needs, select a single higher-rated Zener (e.g., 1 W axial-leaded type) or use active regulation with a pass transistor controlled by this Zener reference.

Is the SOD123 package of BZT52C43-7-F compatible with IPC-7351B standard footprints?

Yes-the SOD123 outline dimensions (D = 1.40–1.70 mm, E = 2.55–2.85 mm, L = 0.25–0.40 mm) align with IPC-7351B "SOD123" generic footprint. Recommended land pattern uses X = 0.900 mm pad width, Y = 0.950 mm pad length, and X1 = 4.050 mm center-to-center spacing, matching Diodes' suggested pad layout in DS18004 Rev. 38-2.

Does BZT52C43-7-F require derating above +75°C ambient temperature?

Yes-per Figure 1 (Power Derating Curve), power dissipation must be linearly reduced from 500 mW at +75°C to zero at +150°C. At +100°C ambient, allowable P_D is 375 mW; at +125°C, it drops to 187.5 mW. This derating applies only when lead temperature (T_L) is maintained at +75°C; actual board-level thermal design must verify T_L via IR scan or simulation.