Diodes Incorporated BZT52C36SQ-7-F

Overview

BZT52C36SQ-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 36 V, 2 mA test current, 90 Ω maximum zener impedance at 2 mA, 0.5 mA knee current, and 0.1 µA reverse leakage at 30.4 V. It operates in SOD323 package and is AEC-Q101 qualified for automotive applications including ECU power rail clamping and sensor reference stabilization.

For engineers reviewing the BZT52C36SQ-7-F datasheet, BZT52C36SQ-7-F pinout, BZT52C36SQ-7-F application, or BZT52C36SQ-7-F equivalent, key selection criteria include zener voltage tolerance (±5.6%), thermal resistance (625 °C/W), power dissipation (200 mW), and automotive qualification status - all critical for robust overvoltage protection in constrained PCB layouts.

Technical Context

This Zener diode functions as a precision voltage reference and transient suppressor in low-power analog and digital subsystems. Its planar die construction ensures stable breakdown characteristics across temperature, while the SOD323 package enables high-density placement on automotive control modules.

The device exhibits a positive temperature coefficient of +25.2 mV/°C above 30 V, enabling predictable voltage drift in temperature-varying environments. Reverse leakage remains ≤0.1 µA at VR = 30.4 V, supporting low-quiescent-current designs in battery-backed circuits.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-compact 2-pin surface-mount plastic case (1.30 mm × 1.70 mm × 0.90 mm), 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 MMBZ5275B-7-F and BZX84-C36-7-F, BZT52C36SQ-7-F uniquely combines AEC-Q101 qualification, SOD323 miniaturization, and 90 Ω zener impedance - making it optimal for space-constrained automotive modules requiring precise, reliable clamping.

Availability

BZT52C36SQ-7-F is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and medical portable device battery monitoring systems requiring stable component supply and full traceability.

Supply support for BZT52C36SQ-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

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

FAQ

What is the maximum power dissipation of BZT52C36SQ-7-F at 100°C ambient?

At 100°C ambient, the device's power dissipation must be derated linearly from 200 mW at 25°C using the 625 °C/W thermal resistance. Derated power = 200 mW × (1 − (100 − 25)/625) = 176 mW. This ensures junction temperature stays below 150°C under steady-state conditions.

Does BZT52C36SQ-7-F have a defined cathode marking on the SOD323 package?

Yes - the SOD323 package features a distinct cathode band printed on the top surface, aligned with the cathode terminal. The band is visible under standard optical inspection and matches the polarity diagram in DS30093 Rev. 20-2, page 2.

Can BZT52C36SQ-7-F replace BZT52C36S-7-F in an existing design?

Yes - BZT52C36SQ-7-F is the automotive-qualified variant of BZT52C36S-7-F, sharing identical electrical specs, SOD323 package, and marking code "WS". The "Q" suffix denotes AEC-Q101 qualification; no layout or schematic changes are needed for drop-in replacement in automotive designs.

What is the typical capacitance of BZT52C36SQ-7-F at 1 V reverse bias?

Per Figure 4 in DS30093 Rev. 20-2, the typical total capacitance at V_R = 1 V is approximately 15 pF. This value is consistent with the 36 V nominal zener voltage and supports high-frequency transient suppression without signal integrity degradation.