Diodes Incorporated BZT585B2V4T-7

Overview

BZT585B2V4T from Diodes Incorporated is a precision surface-mount Zener diode with a nominal breakdown voltage of 2.4 V ±2.0%, 350 mW power dissipation, and SOD523 package. It provides stable voltage reference in low-power analog circuits, biasing networks, and overvoltage protection for microcontroller I/O pins.

For engineers reviewing the BZT585B2V4T datasheet, BZT585B2V4T pinout, BZT585B2V4T application, or BZT585B2V4T equivalent, key selection criteria include its tight 2.4 V tolerance, low 100 Ω dynamic impedance at 5 mA, -1.3 mV/°C temperature coefficient, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage across a defined current range (5 mA test condition). Its low 100 Ω Zener impedance at I_ZT = 5 mA ensures minimal voltage variation under load changes, while the negative temperature coefficient (-1.3 mV/°C) enables predictable thermal drift compensation in precision references.

The SOD523 package supports high power density with 357 °C/W junction-to-ambient thermal resistance on FR-4 PCBs using recommended pad layout. Cathode band marking and matte tin-plated Alloy 42 leads ensure reliable solderability and compliance with RoHS, halogen-free, and AEC-Q101 requirements.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact 1.7 mm × 0.9 mm surface-mount plastic case with flat lead design for low profile (max height 0.35 mm) and enhanced thermal performance on standard PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5221BS-7-F and BZX84-C2V4, the BZT585B2V4T delivers tighter voltage tolerance, higher power rating, superior thermal performance in SOD523, and full AEC-Q101 validation-making it the preferred choice for automotive and high-reliability industrial voltage reference designs.

Availability

BZT585B2V4T is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and low-power IoT node voltage supervision requiring stable component supply and long-term lifecycle support.

Supply support for BZT585B2V4T 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 BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and overvoltage protection in space-constrained, thermally demanding automotive and industrial applications.

FAQ

What is the maximum reverse current specification for BZT585B2V4T at 1 V?

The maximum reverse current (I_R) is 50 µA at V_R = 1 V, measured at 25°C ambient. This low leakage ensures minimal quiescent power draw in battery-powered systems and prevents unintended loading of high-impedance reference nodes.

Does BZT585B2V4T require a heatsink for 350 mW operation?

No heatsink is required. At 350 mW dissipation, the device reaches thermal equilibrium at approximately 125°C junction temperature when mounted on an FR-4 PCB with Diodes Incorporated's recommended SOD523 pad layout (AP02001), leveraging its 357 °C/W R_θJA.

How does the -1.3 mV/°C temperature coefficient affect circuit accuracy?

Over a -40°C to +125°C range, the Zener voltage shifts by ±215 mV relative to 25°C value. In precision references, this drift must be compensated via circuit topology (e.g., combining with positive-TC components) or calibrated out in firmware for sub-0.5% total error.

Is the SOD523 package compatible with standard reflow profiles?

Yes. The device is qualified for JEDEC J-STD-020 moisture sensitivity Level 1 and withstands peak reflow temperatures up to 260°C. Matte tin plating ensures robust wetting and void-free solder joints using standard SnPb or lead-free profiles.