Diodes Incorporated BZT52C27-7-F

Overview

BZT52C27-7-F from Diodes Incorporated is a surface-mount 27 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% zener voltage tolerance (25.1–28.9 V), 80 Ω maximum zener impedance at 2 mA test current, and 0.1 µA maximum reverse leakage at 21.4 V. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.

For engineers reviewing the BZT52C27-7-F datasheet, BZT52C27-7-F pinout, BZT52C27-7-F application, or BZT52C27-7-F equivalent, key selection criteria include its 27 V nominal breakdown voltage, SOD123 footprint compatibility, AEC-Q101 qualification for automotive use, thermal resistance (RθJA = 338 °C/W), and low leakage performance under sub-breakdown bias.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across load variations and supply fluctuations. Its planar die construction ensures consistent breakdown characteristics and long-term stability under repeated thermal cycling.

The device exhibits a positive temperature coefficient of +0.08 mV/°C near 27 V, enabling predictable drift behavior in temperature-sensitive references. Its 0.010 g mass and UL 94V-0 molded plastic case support high-reliability automated assembly on FR-4 PCBs with 1-inch copper pad layouts.

Key Specifications

Pinout & Package

Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: L = 0.30 mm (lead length), D = 1.55 mm (width), E = 2.65 mm (length), A = 1.05 mm (height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5254BT1G and BZX84-C27, BZT52C27-7-F offers superior thermal performance (R_θJA = 338 °C/W), AEC-Q101 validation, and higher power headroom-making it optimal for automotive and industrial systems demanding robust transient suppression and long-term stability.

Availability

BZT52C27-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C power adapters, and portable medical devices requiring stable component supply with traceable sourcing and lifecycle continuity.

Supply support for BZT52C27-7-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 since 1960.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for precision voltage regulation and overvoltage protection in cost-sensitive, high-volume applications with stringent environmental requirements.

FAQ

What is the maximum continuous Zener current for BZT52C27-7-F at room temperature?

At T_A = +25°C, the device is rated for 370 mW power dissipation. With a nominal Zener voltage of 27 V, the maximum continuous current is approximately 13.7 mA (370 mW ÷ 27 V). Exceeding this value risks thermal runaway unless board-level thermal management is implemented.

Does BZT52C27-7-F support lead-free reflow soldering?

Yes. The device features matte tin-plated alloy 42 leads, qualified per J-STD-020 moisture sensitivity level 1, and is fully compatible with standard Pb-free reflow profiles (peak temperature up to 260°C). No pre-bake is required due to its green molding compound and low hygroscopicity.

How does the temperature coefficient affect regulation accuracy in a 27 V reference circuit?

The BZT52C27-7-F has a temperature coefficient of +0.08 mV/°C near 27 V. Over a -40°C to +125°C range (165°C delta), this introduces ±13.2 mV drift - less than ±0.05% of 27 V - making it suitable for non-critical references where absolute accuracy below 0.1% is not required.

Can BZT52C27-7-F replace BZT52C24-7-F in an existing design?

No direct substitution is recommended. While both share the same SOD123 package and power rating, the 27 V device clamps 3 V higher than the 24 V version. This may cause insufficient protection in circuits designed for 24 V thresholds or exceed voltage ratings of downstream components like 25 V-rated capacitors or LDOs.