Diodes Incorporated BZT52C3V3SQ-7-F

Overview

BZT52C3V3SQ-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 3.3 V zener voltage, 5 mA test current, 95 Ω maximum zener impedance at 1 kHz, 5 µA maximum reverse leakage at 1.0 V, and ±3.5 mV/°C temperature coefficient. It operates in SOD323 package and is AEC-Q101 qualified for automotive power rail clamping and voltage reference applications.

For engineers reviewing the BZT52C3V3SQ-7-F datasheet, BZT52C3V3SQ-7-F pinout, BZT52C3V3SQ-7-F application, or BZT52C3V3SQ-7-F equivalent, key selection criteria include zener voltage tolerance (±6%), thermal resistance (625 °C/W), power dissipation (200 mW), cathode-band polarity marking, and automotive-grade reliability qualification.

Technical Context

This device functions as a precision voltage reference and overvoltage clamp in low-power analog and digital circuits. Its planar die construction ensures stable breakdown characteristics across temperature, while the SOD323 package enables high-density PCB layouts compatible with automated reflow assembly.

The diode exhibits a typical zener voltage of 3.3 V at 5 mA with ±6% tolerance (3.1–3.5 V), 95 Ω dynamic impedance at 1 kHz, and a negative temperature coefficient of −3.5 mV/°C - enabling predictable drift compensation in bias networks and feedback paths.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.0049 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F and BZX384-C3V3,115, BZT52C3V3SQ-7-F offers automotive qualification and optimal balance of size, leakage (5 µA), and thermal resistance (625 °C/W) for space-constrained 3.3 V rail protection in harsh environments.

Availability

BZT52C3V3SQ-7-F is available at Aetrix Electronics and suitable for automotive power rail protection, low-power voltage reference, USB interface ESD clamp, and industrial sensor excitation requiring stable component supply and AEC-Q101 compliance.

Supply support for BZT52C3V3SQ-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 demanding automotive and industrial environments where reliability and consistency are critical.

FAQ

What is the maximum reverse leakage current for BZT52C3V3SQ-7-F at 1.0 V?

The maximum reverse leakage current is 5 µA at VR = 1.0 V, measured at TA = +25°C. This value ensures minimal loading on low-power reference nodes and supports long battery life in always-on sensor circuits. The leakage remains below 10 µA across the full −40°C to +125°C operating range per AEC-Q101 stress testing.

Is BZT52C3V3SQ-7-F suitable for use in 3.3 V logic rail clamping?

Yes - its 3.3 V nominal zener voltage with 3.1–3.5 V tolerance band aligns precisely with 3.3 V system rails. With 200 mW power rating and 95 Ω dynamic impedance, it clamps transients without oscillation and maintains regulation within ±0.2 V under 10 mA surge conditions, making it ideal for FPGA I/O and MCU reset line protection.

How does the −3.5 mV/°C temperature coefficient affect circuit performance?

The negative temperature coefficient causes the zener voltage to decrease by 3.5 mV per degree Celsius rise. In precision references, this drift must be compensated via resistor networks or matched components; however, in clamping applications, the effect is secondary to peak voltage limitation, and the predictable slope allows for worst-case margining in thermal design.

What is the recommended pad layout for SOD323 mounting of BZT52C3V3SQ-7-F?

Diodes Incorporated specifies a pad layout with X = 0.590 mm, X1 = 2.700 mm, Y = 0.450 mm for SOD323. Copper area should follow JEDEC MS-012 guidelines to achieve the rated 625 °C/W thermal resistance. Excessive copper pour under the device degrades thermal performance and may cause solder wicking during reflow.