Diodes Incorporated BZT52C30S-7-F

Overview

BZT52C30S-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 30 V, ±6.7% tolerance (28.0–32.0 V), 2 mA test current, 80 Ω maximum zener impedance at 2 mA, and 0.5 µA maximum reverse leakage at 24.4 V. It operates in SOD323 package and is AEC-Q101 qualified for automotive-grade reliability in voltage regulation and overvoltage protection circuits.

For engineers reviewing the BZT52C30S-7-F datasheet, BZT52C30S-7-F pinout, BZT52C30S-7-F application, or BZT52C30S-7-F equivalent, key selection criteria include zener voltage accuracy at low test current, thermal resistance (625 °C/W), power dissipation (200 mW), and automotive qualification status - all critical for precision biasing and ESD-tolerant clamp design in space-constrained PCBs.

Technical Context

This Zener diode functions as a two-terminal voltage reference and shunt regulator, operating in reverse breakdown mode with stable voltage regulation across its specified current range (0.5–20 mA). Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance under transient conditions.

The device exhibits a positive temperature coefficient of +21.0 mV/°C above 6 V, enabling predictable drift compensation in temperature-sensitive analog circuits. Its SOD323 package supports automated placement and reflow soldering while maintaining thermal performance suitable for ambient temperatures from –65 °C to +150 °C.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-compact surface-mount plastic case (1.30 mm × 1.70 mm × 0.90 mm), matte tin-plated alloy 42 leadframe, cathode band polarity marking, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5257ET1G and BZX384-C30, BZT52C30S-7-F offers tighter voltage tolerance at lower test current (2 mA), automotive qualification, and optimized thermal performance in the same SOD323 footprint - making it the preferred choice for safety-critical and space-constrained automotive voltage reference designs.

Availability

BZT52C30S-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and consumer power adapter feedback circuits requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZT52C30S-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.

The BZT52C series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The BZT52C30S-7-F has a nominal zener voltage of 30 V with a guaranteed breakdown range of 28.0 V to 32.0 V at 2 mA test current. Below 24.4 V, reverse leakage remains ≤0.1 µA; sustained operation above 32.0 V risks thermal runaway unless current is strictly limited by external series resistance.

Is this part suitable for use in high-frequency signal clamping applications?

Yes - its typical junction capacitance is less than 2 pF at 0 V bias, enabling effective clamping of RF transients up to ~100 MHz. However, for frequencies above 10 MHz, layout parasitics dominate, so direct placement adjacent to protected nodes and short ground paths are essential to preserve bandwidth.

How does the temperature coefficient affect regulation accuracy over temperature?

With a +21.0 mV/°C temperature coefficient, the zener voltage increases by approximately 2.1 V over a 100 °C range (e.g., from 25 °C to 125 °C). For applications requiring <1% regulation stability, external compensation or selection of lower-coefficient alternatives (e.g., 6.2 V Zeners) may be necessary.

Can this diode replace older through-hole Zeners like 1N4749A in new designs?

Yes, functionally - both regulate at ~30 V - but BZT52C30S-7-F requires SOD323 footprint adaptation and delivers superior thermal performance (625 °C/W vs. ~300 °C/W for DO-41). Its AEC-Q101 qualification also enables direct use in automotive PCBs where 1N4749A lacks formal reliability validation.