Diodes Incorporated BZT52C3V0-7

Overview

BZT52C3V0-7 from Diodes Incorporated is a surface-mount 3.0 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with ±5% zener voltage tolerance (2.8–3.2 V), 95 Ω dynamic impedance at 5 mA test current, and 10 µA maximum reverse leakage at 1.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.

For engineers reviewing the BZT52C3V0-7 datasheet, BZT52C3V0-7 pinout, BZT52C3V0-7 application, or BZT52C3V0-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (RθJA = 338 °C/W), junction-to-lead thermal performance (RθJL = 150 °C/W), AEC-Q101 qualification status, and SOD123 footprint compatibility with automated PCB assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under controlled current conditions. Its planar die construction ensures consistent breakdown characteristics, while the matte tin–plated Alloy 42 leadframe guarantees solderability per MIL-STD-202, Method 208 and RoHS compliance.

The device exhibits a negative temperature coefficient of −3.5 mV/°C, enabling predictable drift compensation in temperature-sensitive references. Its 1.0 V forward voltage at 10 mA supports bidirectional protection configurations when paired with another diode, and its 0.010 g mass minimizes mechanical stress on fine-pitch PCBs.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking, UL 94V-0 flammability rating, moisture sensitivity level 1 per J-STD-020, and 0.010 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5222BS-7-F, BZT52C3V0-7 offers lower thermal resistance and smaller SOD123 footprint; compared with 1N4728A, it provides 3.7× higher power rating and full SMT compatibility-making it optimal for modern, space-constrained, high-reliability designs.

Availability

BZT52C3V0-7 is available at Aetrix Electronics and suitable for USB port protection, microcontroller reset circuits, industrial sensor signal conditioning, and low-power IoT node voltage reference applications requiring stable component supply and AEC-Q101 reliability assurance.

Supply support for BZT52C3V0-7 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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for medium-current voltage regulation and transient suppression in cost-sensitive, high-volume consumer, industrial, and automotive applications.

FAQ

What is the maximum continuous reverse current the BZT52C3V0-7 can handle without degradation?

The BZT52C3V0-7 is rated for 5 mA test current (I_ZT) and supports up to 100 mA peak pulse current per datasheet Figure 2. Continuous operation must remain within its 370 mW power limit at +25°C ambient, translating to ~123 mA at 3.0 V-provided thermal management maintains junction temperature ≤ +150°C. Derating is required above +25°C per Fig. 1.

Does the BZT52C3V0-7 have polarity marking, and how is it identified on the device?

Yes-the BZT52C3V0-7 uses a cathode band marking on the SOD123 body, located adjacent to the cathode terminal. The band is a visible dark stripe aligned with the cathode end of the package, matching industry-standard SOD123 polarity convention. Top-view diagrams in DS18004 Rev. 38-2 confirm this orientation.

Is the BZT52C3V0-7 suitable for use in automotive applications?

Yes-the BZT52C3V0-7 is qualified to AEC-Q101 standards for high-reliability automotive use. Its operating temperature range (−65 to +150 °C), robust SOD123 package, and RoHS-compliant lead-free plating meet requirements for engine control units, body electronics, and infotainment systems per Diodes' official qualification documentation.

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

The negative temperature coefficient means the zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. In a 3.0 V reference, this yields ~0.12% drift over a 35 °C ambient change. Designers compensate by selecting complementary components or using it in temperature-compensated pairs-common in precision voltage monitors and reset supervisors.