Diodes Incorporated BZT52C39-13

Overview

BZT52C39-13 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 39 V (min 37.0 V, max 41.0 V), 500 mW power dissipation at TL = +75°C, and 370 mW at TA = +25°C, designed for precision voltage regulation and overvoltage protection in low-power analog circuits, power supply feedback loops, and reference voltage generation.

For engineers reviewing the BZT52C39-13 datasheet, BZT52C39-13 pinout, BZT52C39-13 application, or BZT52C39-13 equivalent, key selection criteria include zener voltage tolerance (±2.6%), dynamic impedance (130 Ω @ 2 mA), reverse leakage (0.1 µA @ 33.4 V), temperature coefficient (+27.3 mV/°C), and SOD123 package compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode 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 thermal dissipation up to 370 mW at ambient temperature.

The device exhibits a positive temperature coefficient of +27.3 mV/°C, indicating voltage increases with rising junction temperature - critical for thermal drift compensation in reference designs. It is qualified to AEC-Q101 standards, confirming suitability for automotive-grade reliability requirements.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5242B-7-F and BZX84-C39, BZT52C39-13 delivers highest power margin (370 mW), lowest zener impedance (130 Ω), and AEC-Q101 qualification - making it optimal for automotive and industrial applications demanding long-term regulation stability under thermal stress.

Availability

BZT52C39-13 is available at Aetrix Electronics and suitable for power supply feedback, voltage reference, overvoltage clamp, and ESD protection interface applications requiring stable component supply, automotive-grade reliability, and RoHS-compliant manufacturing.

Supply support for BZT52C39-13 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 consumer markets.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for precision voltage regulation and robustness in automated SMT assembly environments.

FAQ

What is the maximum reverse voltage that can be continuously applied without breakdown?

The BZT52C39-13 has a nominal zener voltage of 39 V with a tolerance range of 37.0–41.0 V at test current. Continuous reverse voltage below 37.0 V will not cause significant conduction; operation above 41.0 V risks uncontrolled breakdown and thermal runaway unless current-limited externally.

Is this part suitable for use in automotive applications?

Yes - BZT52C39-13 is qualified to AEC-Q101 standards, confirming compliance with automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. Its SOD123 package and green material composition meet automotive manufacturing and environmental specifications.

How does the temperature coefficient affect circuit performance?

With a temperature coefficient of +27.3 mV/°C, the zener voltage increases linearly with junction temperature. In a 50°C ambient-to-junction rise, voltage shifts +1.365 V - critical for high-precision references; compensation networks or TC-matched components may be needed for sub-1% stability.

What is the recommended PCB pad layout for thermal performance?

Diodes Incorporated specifies a 1-inch copper pad layout on FR-4 for thermal resistance measurement (R_θJA = 338 °C/W). For optimal thermal performance, use minimum 2.5 mm² copper area per pad, connect both pads to internal ground planes via multiple vias, and avoid solder mask over thermal pads.