Diodes Incorporated BZT585B5V1TQ-7

Overview

BZT585B5V1TQ-7 from Diodes Incorporated is a precision Zener diode with 5.1 V nominal breakdown voltage (±2.0% tolerance), 350 mW power dissipation, and SOD523 package. It operates across –65 °C to +150 °C, features 60 Ω dynamic impedance at 5 mA test current, and is AEC-Q101 qualified for automotive voltage regulation and reference applications.

For engineers reviewing the BZT585B5V1TQ-7 datasheet, BZT585B5V1TQ-7 pinout, BZT585B5V1TQ-7 application, or BZT585B5V1TQ-7 equivalent, this device serves as a stable, low-profile voltage reference in space-constrained automotive ECUs, sensor signal conditioning circuits, and power supply feedback loops where ±2% voltage accuracy and thermal stability are critical.

Technical Context

This Zener diode uses silicon planar construction to achieve tight 5.00–5.20 V breakdown voltage tolerance at I_ZT = 5 mA, with a near-zero temperature coefficient of –0.5 mV/°C - enabling minimal drift over temperature in biasing and reference designs. Its low 300 pF capacitance at 0 V and 2 µA maximum reverse leakage at 2 V support high-frequency stability and low-power standby operation.

The device is optimized for surface-mount reliability: flat-lead SOD523 package minimizes profile (max height 0.65 mm), delivers 357 °C/W junction-to-ambient thermal resistance on FR-4 PCB, and meets AEC-Q101 stress testing for automotive underhood environments including thermal cycling, humidity, and mechanical shock.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact, flat-lead surface-mount package with cathode band marking. Molded green compound (UL 94V-0), matte tin annealed terminals, 0.001 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5231BT1G and BZX84-C5V1, BZT585B5V1TQ-7 delivers tighter voltage tolerance, automotive qualification, and superior thermal performance in the smallest footprint - making it optimal for next-generation compact, safety-critical systems.

Availability

BZT585B5V1TQ-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, USB-C power delivery monitors, and medical wearable battery management systems requiring stable component supply across long production lifecycles.

Supply support for BZT585B5V1TQ-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, specializing in high-reliability components for automotive, industrial, and computing markets with ISO/TS 16949 and IATF16949:2016 certified facilities.

The BZT585 series is part of Diodes' AEC-Q101-qualified Zener portfolio, designed specifically for precision voltage reference and regulation in harsh-environment automotive electronics where stability, small size, and regulatory compliance are mandatory.

FAQ

What is the maximum reverse voltage before breakdown for BZT585B5V1TQ-7?

The BZT585B5V1TQ-7 has a nominal Zener voltage of 5.1 V with a guaranteed range of 5.00–5.20 V at 5 mA test current. Breakdown occurs sharply within this range; operation below 5.00 V results in negligible reverse current (<2 µA at 2 V), while sustained voltage >5.20 V risks exceeding power limits unless current is strictly limited by external series resistance.

Is BZT585B5V1TQ-7 suitable for use in high-frequency signal paths?

Yes - its 300 pF junction capacitance at 0 V and 1 kHz Zener impedance of 60 Ω make it suitable for stabilizing DC bias points in RF front-ends and high-speed sensor amplifiers. However, it is not intended as an RF shunt; for >10 MHz noise suppression, dedicated RF capacitors or TVS diodes are recommended alongside this Zener.

How does the SOD523 package affect thermal performance compared to SOD-123?

The SOD523 package delivers 357 °C/W junction-to-ambient thermal resistance on standard FR-4 PCBs - approximately 25% lower than typical SOD-123 devices (~450 °C/W). This enables higher sustained power handling (350 mW vs. ~200 mW) in confined spaces, provided minimum pad layout per Diodes' package outline is followed.

Does BZT585B5V1TQ-7 require derating at elevated temperatures?

Yes - the device follows a linear derating curve: power dissipation must be reduced by 2.8 mW/°C above +25 °C ambient, reaching 0 mW at +150 °C. At +105 °C ambient, maximum allowable power drops to 126 mW. Derating is defined in Figure 1 of DS38426 Rev. 4-2 and applies regardless of airflow or board copper area.