Diodes Incorporated BZT52C39-13-F

Overview

BZT52C39-13-F from Diodes Incorporated is a surface-mount 39 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 130 Ω maximum Zener impedance at 2 mA test current and ±5% voltage tolerance (37.0–41.0 V). It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.

For engineers reviewing the BZT52C39-13-F datasheet, BZT52C39-13-F pinout, BZT52C39-13-F application, or BZT52C39-13-F equivalent, this device is selected for stable 39 V regulation in space-constrained consumer, industrial, and automotive subsystems where AEC-Q101 qualification, RoHS compliance, and automated assembly compatibility are required.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 39 V at 2 mA test current (IZT), exhibiting a temperature coefficient of –3.5 mV/°C and maximum reverse current of 0.1 µA at VR = 33.4 V. Its planar die construction ensures stable voltage regulation under transient load conditions.

The device features a cathode-band polarity marking, matte tin-plated alloy 42 leadframe, and UL 94V-0 molded plastic case. Thermal resistance from junction to ambient is 338 °C/W on FR-4 PCB with 1-inch copper pad, limiting continuous power handling at elevated ambient temperatures.

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 reflow soldering and compatible with standard pick-and-place equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5239BS-7-F and BZX84-C39LT1G, BZT52C39-13-F delivers higher power capability (370 mW), automotive qualification, and tighter thermal resistance control-making it the preferred choice for robust, thermally demanding, or safety-compliant designs.

Availability

BZT52C39-13-F is available at Aetrix Electronics and suitable for USB power delivery protection, industrial sensor reference circuits, automotive body control modules, and consumer appliance power monitoring requiring stable component supply and long-term lifecycle support.

Supply support for BZT52C39-13-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.

BZT52C39-13-F belongs to the BZT52C series of general-purpose Zener diodes, designed for medium-current voltage regulation and overvoltage protection in cost-sensitive, high-volume applications with stringent environmental compliance requirements.

FAQ

What is the maximum reverse voltage (VR) at which IR ≤ 0.1 µA for BZT52C39-13-F?

The datasheet specifies that reverse current IR is ≤ 0.1 µA at VR = 33.4 V. This value is derived from the "Maximum Reverse Current" column in the Electrical Characteristics table for BZT52C39, corresponding to the "IR @ VR" parameter. It defines the upper limit of applied reverse bias before measurable leakage begins, critical for low-power standby operation.

Can BZT52C39-13-F be used in parallel for higher power dissipation?

No-Zener diodes exhibit negative temperature coefficients and manufacturing tolerances that cause current imbalance when paralleled. One device will dominate conduction, leading to thermal runaway. For higher power, use a single higher-rated Zener or implement active regulation with a transistor-based shunt.

Is the SOD123 package of BZT52C39-13-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) match IPC-7351B "SOD-123" land pattern recommendations. The suggested pad layout (X = 0.900 mm, X1 = 4.050 mm, Y = 0.950 mm) aligns with Class L density for reliable reflow yield.

Does the "-13-F" suffix indicate tape-and-reel packaging and RoHS compliance?

Yes-the "-13-F" suffix denotes 10,000-unit tape-and-reel packaging (per Ordering Information table) and confirms full RoHS compliance, halogen/antimony-free "Green" construction, and matte tin lead finish per MIL-STD-202. The "F" explicitly designates lead-free plating.