Diodes Incorporated BZT52C30-7

Overview

BZT52C30-7 from Diodes Incorporated is a surface-mount 30 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with ±3.3% zener voltage tolerance (28.0–32.0 V @ 2 mA), 80 Ω maximum zener impedance at test current, and <0.1 µA reverse leakage at 24.4 V. It serves as a precision voltage reference or overvoltage clamp in low-power DC supply rails and sensor interface circuits.

For engineers reviewing the BZT52C30-7 datasheet, BZT52C30-7 pinout, BZT52C30-7 application, or BZT52C30-7 equivalent, key selection criteria include its 30 V nominal zener voltage, SOD123 footprint compatibility, thermal resistance (RθJA = 338 °C/W), AEC-Q101 qualification, and RoHS/Green compliance - all critical for automotive and industrial board-level protection designs.

Technical Context

This Zener diode operates in reverse breakdown mode to regulate or clamp voltage at a stable 30 V level under controlled test conditions (IZT = 2 mA). Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance across temperature.

Thermal performance is defined by junction-to-ambient (338 °C/W) and junction-to-lead (150 °C/W) resistances, with derating required above +75°C ambient or lead temperature. The cathode band polarity marking enables unambiguous PCB orientation during automated assembly.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case (UL 94V-0), 0.010 g weight, matte tin-plated alloy 42 leadframe, cathode band polarity marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5260BS-7-F and BZX84-C30-7, BZT52C30-7 offers superior thermal robustness (370 mW at +25°C), AEC-Q101 qualification, and tighter VZ tolerance - making it the preferred choice for automotive and high-reliability industrial voltage regulation where sustained power dissipation and long-term stability are essential.

Availability

BZT52C30-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial I/O protection, and low-power voltage reference applications requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for BZT52C30-7 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 consumer markets.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for precision voltage regulation and overvoltage protection in compact, automated-assembly-ready packages like SOD123.

FAQ

What is the maximum reverse voltage (VR) at which BZT52C30-7 guarantees IR ≤ 0.1 µA?

The datasheet specifies IR ≤ 0.1 µA at VR = 24.4 V. This value is derived from the 80% rule (0.8 × 30.5 V typical upper limit) and represents the highest reverse voltage at which leakage remains below the guaranteed threshold - critical for low-power standby circuits where microamp-level leakage must be avoided.

Can BZT52C30-7 be used in place of a 27 V Zener for overvoltage protection?

No - BZT52C30-7 has a nominal zener voltage of 30 V (28.0–32.0 V range), not 27 V. Substituting it for a 27 V part would raise the clamping threshold by ~3 V, potentially exposing downstream circuitry to damaging overvoltage. Use BZT52C27-7 (27 V, 25.1–28.9 V range) instead for that specification.

Is the SOD123 package of BZT52C30-7 compatible with reflow soldering per J-STD-020?

Yes - the device is qualified for moisture sensitivity level 1 (MSL-1), meaning it can be stored indefinitely at ≤30 °C/85% RH and subjected to standard Pb-free reflow profiles (peak 260 °C) without baking. Its matte tin finish ensures reliable solder wetting per MIL-STD-202, Method 208.

Does BZT52C30-7 have a specified temperature coefficient (TC) for its zener voltage?

No - the datasheet does not list a temperature coefficient for BZT52C30-7. Unlike lower-voltage Zeners (e.g., BZT52C5V1, TC = −2.7 mV/°C), the 30 V variant's TC is omitted, indicating it is not characterized or guaranteed; designers should rely on the full VZ range (28.0–32.0 V) across −65 °C to +150 °C rather than assuming linear drift.