Diodes Incorporated BZT52C30Q-7-F

Overview

BZT52C30Q-7-F from Diodes Incorporated is an automotive-grade surface-mount Zener diode with a nominal zener voltage of 30 V, ±6.7% tolerance (28.0–32.0 V), 500 mW power dissipation at TL = +75°C, and 370 mW at TA = +25°C. It features SOD123 package, AEC-Q101 qualification, and is used for precision voltage regulation and overvoltage protection in automotive body control modules.

For engineers reviewing the BZT52C30Q-7-F datasheet, BZT52C30Q-7-F pinout, BZT52C30Q-7-F application, or BZT52C30Q-7-F equivalent, key selection criteria include zener voltage accuracy at 2 mA test current, low dynamic impedance (80 Ω at IZT), temperature coefficient (+21.0 mV/°C), and automotive reliability compliance under AEC-Q101.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across load variations. Its planar die construction ensures consistent breakdown characteristics and low leakage (<0.1 µA at VR = 24.4 V), while the SOD123 package supports automated assembly and thermal performance up to +150°C junction temperature.

The device exhibits a positive temperature coefficient of +21.0 mV/°C, enabling predictable voltage drift in temperature-varying environments. Its 80 Ω zener impedance at 2 mA test current ensures minimal output variation under dynamic load conditions typical in automotive sensor biasing and ECU power rail clamping.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking, 0.010 g weight, UL 94V-0 flammability rating, and matte tin-plated alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5257ET1G and BZX84-C30LT1G, BZT52C30Q-7-F delivers verified automotive reliability, lower leakage (<0.1 µA vs. 1.0 µA), and superior thermal robustness (370 mW @ +25°C vs. 350 mW), making it the sole choice for safety-critical vehicle subsystems.

Availability

BZT52C30Q-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZT52C30Q-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 integrated circuits, specializing in high-reliability components for automotive, industrial, and computing markets.

The BZT52C series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in harsh automotive environments where thermal stability and long-term parametric consistency are mandatory.

FAQ

What is the maximum reverse voltage (VR) at which BZT52C30Q-7-F guarantees IR ≤ 0.1 µA?

The datasheet specifies IR ≤ 0.1 µA at VR = 24.4 V. This value corresponds to 82% of the nominal 30 V zener voltage and serves as the maximum reverse bias condition under which leakage remains within the guaranteed limit. Exceeding this voltage increases leakage exponentially and may initiate premature breakdown.

Can BZT52C30Q-7-F be used in place of a 33 V Zener for overvoltage clamping?

No - its 30 V nominal zener voltage and 32.0 V maximum breakdown (at IZT = 2 mA) provide insufficient margin for reliable 33 V clamping. Using it risks premature conduction and inadequate protection; a BZT52C33Q-7-F (33 V, 35.0 V max) is the correct replacement for that voltage threshold.

Does the "Q" suffix in BZT52C30Q-7-F indicate AEC-Q200 qualification?

No - the "Q" denotes AEC-Q101 qualification for discrete semiconductors, not AEC-Q200 (which applies to passive components). This part meets stress-test requirements for temperature cycling, humidity, and high-temperature operating life defined in AEC-Q101 Rev D, confirming suitability for automotive electronic control units.

How does thermal derating affect usable power at 105°C ambient temperature?

Per Figure 1, at TA = +105°C, the allowable power drops to ~220 mW - a 40% reduction from the 370 mW rating at +25°C. This reflects the 338 °C/W junction-to-ambient thermal resistance and requires PCB copper area optimization to avoid exceeding TJ = +150°C under continuous operation.