Diodes Incorporated BZT52C10SQ-7-F

Overview

BZT52C10SQ-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 10 V zener voltage (9.4–10.6 V at 5 mA), 200 mW power dissipation, 20 Ω zener impedance at test current, and SOD323 package. It provides precise voltage regulation in low-power biasing, reference, and overvoltage protection circuits for automotive and industrial control modules.

For engineers reviewing the BZT52C10SQ-7-F datasheet, BZT52C10SQ-7-F pinout, BZT52C10SQ-7-F application, or BZT52C10SQ-7-F equivalent, key selection criteria include zener voltage tolerance, thermal resistance (625 °C/W), reverse leakage (<0.1 µA at 8.0 V), temperature coefficient (+4.5 to +8.0 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its planar die construction ensures consistent breakdown characteristics, while the SOD323 package enables high-density PCB layouts and compatibility with automated reflow assembly.

The device exhibits a positive temperature coefficient (+4.5 to +8.0 mV/°C) and low capacitance (~20 pF at 1 V), making it suitable for DC reference and low-frequency clamping applications where thermal drift and signal coupling must be minimized.

Key Specifications

Pinout & Package

SOD323 is a two-terminal surface-mount package with cathode marked by a band on the top surface. Terminals are non-polarized in layout but functionally asymmetric: anode and cathode define forward/reverse conduction direction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52C10SQ-7-F, MMSZ5240B-TP offers higher power margin in a larger package without automotive qualification, while BZX384-C10 matches the SOD323 footprint and AEC-Q101 status but lacks documented temperature coefficient-making BZT52C10SQ-7-F preferred for thermally sensitive precision references.

Availability

BZT52C10SQ-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for BZT52C10SQ-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 units.

FAQ

What is the maximum reverse voltage (V_R) that BZT52C10SQ-7-F can withstand before breakdown?

The device begins controlled reverse breakdown at its nominal zener voltage of 10 V, with guaranteed regulation between 9.4 V and 10.6 V at 5 mA test current. It is not rated for sustained operation above 10.6 V in regulation mode; exceeding this may cause thermal instability unless current is strictly limited by external series resistance.

Is BZT52C10SQ-7-F suitable for use in high-humidity environments like engine bay applications?

Yes. The SOD323 package uses UL 94V-0 molded plastic and meets J-STD-020 Moisture Sensitivity Level 1, allowing indefinite storage at ≤30°C/60% RH. Combined with AEC-Q101 qualification-including 1000-hour unbiased HAST and temperature-humidity-bias testing-it is validated for under-hood automotive deployment.

How does the +4.5 to +8.0 mV/°C temperature coefficient affect circuit accuracy over temperature?

Over a -40°C to +125°C range, the zener voltage shifts by up to ±1.3 V (165°C × 8 mV/°C). For precision references, this requires either system-level calibration, use with complementary tempcos, or selection of adjacent voltage grades (e.g., BZT52C9V1S or BZT52C11S) to bracket target voltage across temperature.

Can BZT52C10SQ-7-F replace a through-hole 1N4740A in an existing design?

No direct replacement: 1N4740A is a 10 V, 1 W through-hole Zener in DO-41 package. While voltage rating matches, BZT52C10SQ-7-F has only 200 mW rating and SOD323 footprint. Substitution requires verifying power dissipation is ≤200 mW, redesigning PCB pads, and confirming thermal relief on FR-4 is sufficient for 625 °C/W R_θJA.