Diodes Incorporated BZT52C5V1S-7

Overview

BZT52C5V1S-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 5.1 V breakdown voltage, 5 mA test current, 60 Ω dynamic impedance at 1 kHz, and 200 mW power dissipation in SOD323 package. It provides precision voltage regulation in low-power analog monitoring circuits, such as power supply feedback loops and reference voltage clamping in automotive sensor interfaces.

For engineers reviewing the BZT52C5V1S-7 datasheet, BZT52C5V1S-7 pinout, BZT52C5V1S-7 application, or BZT52C5V1S-7 equivalent, key selection criteria include Zener voltage tolerance (±5.9% at 4.8–5.4 V), temperature coefficient (−2.7 mV/°C), reverse leakage (1 µA at 2.0 V), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

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

The device exhibits a negative temperature coefficient of −2.7 mV/°C, meaning its Zener voltage decreases linearly with rising junction temperature. At 5 mA test current, it delivers 60 Ω dynamic impedance and 1 µA maximum reverse leakage at VR = 2.0 V - critical for low-noise reference stability in battery-powered instrumentation.

Key Specifications

Pinout & Package

SOD323 is a two-terminal surface-mount package with cathode identified by a band on the top surface. The device has no internal leads; terminals are formed by the alloy 42 leadframe with matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5221BS-7-F and BZX384-B5V1,115, BZT52C5V1S-7 offers optimal balance of low dynamic impedance (60 Ω), low leakage (1 µA), and AEC-Q101 qualification - making it preferred for automotive and long-life portable applications demanding both precision and reliability.

Availability

BZT52C5V1S-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power supply feedback loops, portable medical instrument clamping, and IoT node battery protection requiring stable component supply across extended production lifecycles.

Supply support for BZT52C5V1S-7 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 precision voltage reference and overvoltage protection in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage rating before breakdown for BZT52C5V1S-7?

The BZT52C5V1S-7 has no defined "maximum reverse voltage" rating prior to breakdown - it is designed to operate in controlled reverse breakdown. Its nominal Zener voltage is 5.1 V at 5 mA test current, with guaranteed breakdown occurring between 4.8 V and 5.4 V. Operation below 4.8 V results in negligible reverse current (≤1 µA at 2.0 V).

Can BZT52C5V1S-7 be used in place of a 5 V logic-level clamp?

Yes, but with design constraints: its 5.1 V nominal Zener voltage means clamping begins near 4.8 V and reaches full regulation above 5.4 V. For 5 V TTL/CMOS logic, ensure the driven node can tolerate up to 5.4 V transient and that series current limiting prevents exceeding 200 mW dissipation. It is not a fast transient suppressor like TVS diodes.

Is thermal derating required for operation above 25°C ambient?

Yes - the device's thermal resistance is 625°C/W, so power dissipation must be linearly reduced above 25°C. At 85°C ambient, maximum allowable power drops to 120 mW. Derating follows the curve in Figure 1 of DS30093 Rev. 20-2, requiring PCB layout with recommended pad dimensions for effective heat transfer.

Does BZT52C5V1S-7 have polarity markings compatible with automated optical inspection (AOI)?

Yes - the SOD323 package features a clearly defined cathode band visible under standard AOI lighting. The band aligns with the cathode terminal per JEDEC MO-213AA, and the matte tin finish provides sufficient contrast against the black molding compound for reliable machine vision detection during SMT placement verification.