Diodes Incorporated BZT585B2V4TQ-13

Overview

BZT585B2V4TQ from Diodes Incorporated is a precision Zener diode with 2.4 V nominal breakdown voltage, ±2.0% tolerance, 350 mW power dissipation, and SOD523 package-designed for voltage regulation and reference in space-constrained automotive and industrial circuits.

For engineers reviewing the BZT585B2V4TQ datasheet, BZT585B2V4TQ pinout, BZT585B2V4TQ application, or BZT585B2V4TQ equivalent, key selection criteria include Zener voltage accuracy at 5 mA test current, low dynamic impedance (100 Ω @ 5 mA), temperature coefficient (–1.3 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its –1.3 mV/°C temperature coefficient ensures predictable drift over –65°C to +150°C operating range, and its 450 pF capacitance at 1 MHz supports low-noise analog sensing.

The device delivers 2.35–2.45 V Zener voltage at 5 mA test current with 100 Ω dynamic impedance, enabling tight regulation in feedback loops. Its 357 °C/W junction-to-ambient thermal resistance requires minimal PCB copper area for thermal management in FR-4 layouts.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-small surface-mount plastic package (1.25 mm × 0.85 mm × 0.65 mm), flat lead design optimized for low profile (<0.65 mm height) and thermal performance on FR-4 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-C2V4LT1G, BZT585B2V4TQ offers tighter voltage tolerance, higher power rating, smaller SOD523 footprint, and AEC-Q101 qualification-making it optimal for new automotive and high-accuracy industrial designs where size, stability, and qualification are critical.

Availability

BZT585B2V4TQ is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioning, medical portable monitors, and consumer IoT battery management requiring stable component supply and long-term lifecycle support.

Supply support for BZT585B2V4TQ 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF16949:2016 and quality systems aligned with AEC-Q200 and AEC-Q101 standards.

The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for automotive-grade voltage reference and regulation in harsh-environment applications demanding high reliability and tight parametric control.

FAQ

What is the maximum reverse voltage this Zener diode can withstand before breakdown?

The BZT585B2V4TQ has a nominal Zener voltage of 2.4 V with a guaranteed range of 2.35–2.45 V at 5 mA test current. It begins controlled reverse breakdown within this range and is not rated for sustained operation above 2.45 V without exceeding specified power limits. Absolute maximum reverse voltage is not defined separately-the device is intended for operation at or near its specified V_Z.

Is this part suitable for use in high-reliability automotive applications?

Yes. The BZT585B2V4TQ is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949:2016 certified facilities. Its ±2.0% voltage tolerance, –65°C to +150°C operating range, and halogen-free "Green" construction meet stringent automotive requirements for engine control, body electronics, and ADAS subsystems.

How does the SOD523 package affect thermal performance compared to larger Zener packages?

The SOD523 package delivers 357 °C/W junction-to-ambient thermal resistance when mounted on FR-4 with minimum recommended pad layout. While smaller than SOT-23 or DO-35, its flat-lead design and optimized thermal path enable 350 mW power dissipation-sufficient for low-current reference and clamp roles without heatsinking in most automotive and industrial PCBs.

Can this Zener diode be used in forward-bias mode like a standard diode?

Yes. With 0.9 V forward voltage at 10 mA and 200 mA continuous forward current rating, the BZT585B2V4TQ functions as a low-V_F rectifier or polarity protection diode. However, its primary design intent and characterization focus is reverse-bias Zener regulation; forward characteristics are secondary and not optimized for high-speed switching or surge handling.