Diodes Incorporated BZT52C12S-7-F

Overview

BZT52C12S-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 12 V zener voltage (11.4–12.7 V range at 5 mA), 200 mW power dissipation, and SOD323 package. It provides precision voltage regulation in low-power biasing, reference, and overvoltage protection circuits for consumer, industrial, and automotive electronics.

For engineers reviewing the BZT52C12S-7-F datasheet, BZT52C12S-7-F pinout, BZT52C12S-7-F application, or BZT52C12S-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), dynamic impedance (25 Ω @ 5 mA), reverse leakage (0.1 µA @ 10 V), temperature coefficient (+6.0 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 current loads. Its planar die construction ensures consistent breakdown characteristics and low thermal resistance (625 °C/W junction-to-ambient).

The device exhibits a positive temperature coefficient of +6.0 mV/°C above 6 V, enabling predictable drift compensation in reference designs. Rated for -65 °C to +150 °C operation, it supports high-reliability applications where ambient thermal cycling and long-term stability are critical.

Key Specifications

Pinout & Package

SOD323 package: ultra-compact 2-terminal surface-mount case with molded plastic body (UL 94V-0), matte tin-plated alloy 42 leadframe, and cathode band marking. Weight: 0.0049 g.

Key Features

Applications

Availability

BZT52C12S-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial reference voltage generation, and consumer power supply clamping requiring stable component supply and AEC-Q101 compliance.

Supply support for BZT52C12S-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' high-reliability Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in space-constrained, thermally demanding environments.

FAQ

What is the maximum reverse voltage before breakdown for BZT52C12S-7-F?

The device enters controlled reverse breakdown at a nominal 12 V, with guaranteed minimum and maximum values of 11.4 V and 12.7 V respectively at 5 mA test current. Below 10 V, reverse leakage remains ≤0.1 µA - no significant conduction occurs until reaching the specified zener threshold.

Can BZT52C12S-7-F replace BZX84-C12 in SOD323 designs?

Yes - both are 12 V Zener diodes in SOD323 packages with comparable electrical specs (BZX84-C12: 11.4–12.7 V, 200 mW, 25 Ω Z_ZT). However, BZT52C12S-7-F is AEC-Q101 qualified while BZX84-C12 is commercial-grade, making the former mandatory for automotive applications.

What is the thermal resistance of BZT52C12S-7-F on a standard FR-4 board?

Its junction-to-ambient thermal resistance (R_θJA) is 625 °C/W when mounted on an FR-4 PCB using Diodes Incorporated's recommended pad layout. This value assumes natural convection cooling without heatsinking or copper pour enhancements.

Does BZT52C12S-7-F have polarity marking, and how is it identified?

Yes - it features a visible cathode band on the SOD323 package body. When viewed from the top with the band on the left, the left terminal is cathode and the right is anode. This matches industry-standard SOD323 orientation used in automated placement and visual inspection.