Diodes Incorporated BZT52C47-7

Overview

BZT52C47-7 from Diodes Incorporated is a surface-mount 47 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 100 Ω maximum Zener impedance at 5 mA test current and ±3% voltage tolerance (44.0–50.0 V). It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.

For engineers reviewing the BZT52C47-7 datasheet, BZT52C47-7 pinout, BZT52C47-7 application, or BZT52C47-7 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (RθJA = 338 °C/W), reverse leakage (≤0.1 µA @ 35.0 V), temperature coefficient (–0.2 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance (ZZT ≤ 100 Ω) at IZT = 5 mA, supporting accurate voltage referencing in analog signal conditioning and power supply feedback paths.

The device features a cathode band polarity marker, matte tin-plated alloy 42 leadframe, and UL 94V-0 molded plastic case. With a junction-to-ambient thermal resistance of 338 °C/W on FR-4 PCB and operating range from –65 °C to +150 °C, it supports robust performance in thermally constrained industrial and automotive environments.

Key Specifications

Pinout & Package

Package: SOD123 - molded plastic case with cathode band marking; dimensions: L = 0.30 mm (lead length), D = 1.55 mm (width), E = 2.65 mm (length), He = 3.65 mm (height); RoHS-compliant, halogen-free, AEC-Q101 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5270BS-7-F and BZX84-C47, BZT52C47-7 offers superior thermal performance (RθJA = 338 °C/W), tighter voltage tolerance (±3%), and lower dynamic impedance-making it preferred for automotive and industrial reference applications demanding long-term stability and AEC-Q101 compliance.

Availability

BZT52C47-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and consumer power adapter feedback requiring stable component supply, full traceability, and AEC-Q101 assurance.

Supply support for BZT52C47-7 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, specializing in high-reliability components for automotive, industrial, and computing markets.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, designed specifically for medium-current voltage regulation and overvoltage protection in space-constrained, thermally demanding applications.

FAQ

What is the maximum reverse voltage rating before breakdown for BZT52C47-7?

The BZT52C47-7 has a nominal Zener voltage of 47 V with a guaranteed range of 44.0–50.0 V at 5 mA test current. Breakdown begins within this range; it is not rated for sustained reverse voltage above 50.0 V. The absolute maximum non-repetitive peak reverse voltage is not specified separately-the device is intended for controlled Zener operation, not transient suppression beyond its VZ window.

Can BZT52C47-7 be used in place of a 5.1 V Zener diode?

No-BZT52C47-7 is a fixed 47 V Zener diode and cannot substitute for a 5.1 V device. Its electrical characteristics (VZ = 47 V, IZT = 5 mA, ZZT ≤ 100 Ω) are specific to that voltage grade. Using it in a 5.1 V circuit would result in no conduction until ~44 V, causing functional failure. Select BZT52C5V1-7-F instead for 5.1 V applications.

Is BZT52C47-7 suitable for automotive under-hood applications?

Yes-BZT52C47-7 is AEC-Q101 qualified and rated for TJ = –65 °C to +150 °C. Its SOD123 package, matte tin plating, and halogen-free molding compound meet automotive environmental requirements. Thermal design must account for RθJA = 338 °C/W on FR-4; derating curves in DS18004 confirm usable power at 125 °C ambient when mounted per recommended pad layout.

Does BZT52C47-7 have polarity marking, and how is it identified?

Yes-BZT52C47-7 uses a cathode band marking on the SOD123 package body. The banded end is the cathode terminal; the unmarked end is the anode. This matches standard diode polarity convention: reverse bias (Zener operation) applies positive voltage to the cathode relative to the anode. Top-view diagrams in DS18004 Rev. 38–2 confirm band position and orientation.