Diodes Incorporated BZT52C4V7S-7-F

Overview

BZT52C4V7S-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 4.7 V zener voltage (4.4–5.0 V range), 200 mW power dissipation, 80 Ω maximum zener impedance at 5 mA, and 2 µA maximum reverse current at 2.0 V reverse bias. It is housed in an SOD323 package and qualified to AEC-Q101 for automotive reliability, commonly used for voltage regulation and overvoltage protection in low-power sensor interfaces and microcontroller I/O clamping circuits.

For engineers reviewing the BZT52C4V7S-7-F datasheet, BZT52C4V7S-7-F pinout, BZT52C4V7S-7-F application, or BZT52C4V7S-7-F equivalent, key selection criteria include its tight 4.7 V tolerance, low leakage (2 µA @ VR = 2.0 V), thermal resistance of 625 °C/W, and compatibility with automated SMT assembly on FR-4 PCBs using standard SOD323 pad layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under controlled current conditions. Its planar die construction ensures consistent breakdown characteristics, while the SOD323 package supports high-density board layouts and reflow-compatible lead-free soldering.

The device exhibits a temperature coefficient of –3.5 to 0.2 mV/°C across its operating range (–65 to +150 °C), enabling predictable voltage drift in ambient-varying environments. Its 0.0049 g mass and UL 94V-0 molded plastic case meet stringent mechanical and flammability requirements for automotive and industrial end equipment.

Key Specifications

Pinout & Package

The BZT52C4V7S-7-F uses a two-terminal SOD323 surface-mount package with cathode indicated by a band on the top surface. Terminals are unmarked but follow standard SOD323 orientation: anode (A) and cathode (K) aligned along the long axis, with cathode at the banded end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5225BS-7-F and BZX84-C4V7, BZT52C4V7S-7-F offers superior thermal performance (625 °C/W vs. ~700 °C/W), tighter voltage tolerance, and automotive qualification-making it optimal for space-constrained, high-reliability 3.3 V/5 V interface protection where leakage and stability are critical.

Availability

BZT52C4V7S-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, USB-C accessory monitoring, and smart meter auxiliary power regulation requiring stable component supply and AEC-Q101 compliance.

Supply support for BZT52C4V7S-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 consumer markets with ISO/TS 16949 and ISO 14001 certifications.

The BZT52C series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for voltage reference, clamping, and overvoltage protection in harsh-environment electronics where precision, consistency, and long-term stability are essential.

FAQ

What is the maximum reverse voltage (V_R) at which leakage current is specified for BZT52C4V7S-7-F?

The datasheet specifies 2 µA maximum reverse current (I_R) at V_R = 2.0 V. This value is measured under standard test conditions (T_A = +25 °C) and reflects the diode's ability to block low-level reverse bias without significant leakage-critical for battery-backed circuits and high-impedance sensor interfaces.

Can BZT52C4V7S-7-F be used in place of a 5.1 V Zener for 5 V rail clamping?

No-it is not recommended. With a nominal 4.7 V zener voltage (4.4–5.0 V range), it begins conducting significantly before reaching 5.1 V and may prematurely clamp or overload under nominal 5 V operation. For 5 V rail protection, BZT52C5V1S-7-F (5.1 V) is the appropriate variant with matching package and qualification.

Does the SOD323 package of BZT52C4V7S-7-F support hand-soldering repair?

Yes, but with strict thermal control. The SOD323's small size (1.3 × 1.7 mm) and thermal resistance require preheating the board to 100–120 °C, using fine-tip irons (<0.5 mm), limiting dwell time to <3 seconds per terminal, and verifying post-solder joint integrity via magnification and continuity test-per Diodes' recommended repair guidelines.

Is the marking code "W7" on BZT52C4V7S-7-F traceable to the actual zener voltage bin?

Yes. Per DS30093 Rev. 20–2, "W7" is the official marking code assigned exclusively to the BZT52C4V7S variant, corresponding to the 4.4–5.0 V zener voltage range at 5 mA test current. This code is laser-marked on the device top surface and verified during final test screening.