Diodes Incorporated BZT585B10TQ-7

Overview

BZT585B10TQ from Diodes Incorporated is a precision Zener diode with 10 V nominal breakdown voltage (±2.0% tolerance), 350 mW power dissipation, and SOD523 package. It operates across –65 °C to +150 °C, features 7.0 mV/°C temperature coefficient, and delivers stable voltage reference in low-power analog circuits, automotive sensor signal conditioning, and microcontroller reset supervision.

For engineers reviewing the BZT585B10TQ datasheet, BZT585B10TQ pinout, BZT585B10TQ application, or BZT585B10TQ equivalent, key selection criteria include Zener voltage accuracy, thermal stability at elevated ambient temperatures, low reverse leakage (<0.2 µA @ 7 V), compact SOD523 footprint for space-constrained PCBs, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode uses silicon planar epitaxial construction to achieve tight 2.0% V_Z tolerance at I_ZT = 5 mA and low dynamic impedance (10 Ω typical at 5 mA, 150 Ω max at 1 mA). Its negative-to-positive temperature coefficient transition occurs near 5.6 V; at 10 V, it exhibits a +7.0 mV/°C coefficient, enabling predictable drift compensation in bias networks.

The device is optimized for surface-mount operation on FR-4 PCBs with specified pad layout, delivering 357 °C/W junction-to-ambient thermal resistance. Cathode band marking and matte tin–annealed Alloy 42 leads ensure solderability per MIL-STD-202 and compatibility with lead-free reflow profiles.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact, flat-lead surface-mount package measuring 0.80 mm × 0.60 mm × 0.30 mm (L × W × H), optimized for high-density PCB layouts and automated placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5240B-7-F and BZX84-C10, BZT585B10TQ offers superior voltage accuracy (±2.0% vs. ±5%), smaller SOD523 footprint, and AEC-Q101 qualification-making it optimal for space-constrained automotive and high-reliability industrial voltage references where precision and qualification outweigh raw power headroom.

Availability

BZT585B10TQ is available at Aetrix Electronics and suitable for automotive sensor interfaces, microcontroller reset circuits, low-power industrial voltage monitors, and portable equipment overvoltage protection requiring stable component supply and long-term lifecycle support.

Supply support for BZT585B10TQ 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.

The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for AEC-Q101-compliant voltage reference and regulation in harsh-environment automotive electronics.

FAQ

What is the maximum reverse voltage before breakdown for BZT585B10TQ?

The BZT585B10TQ has a nominal Zener voltage of 10.0 V with ±2.0% tolerance, meaning breakdown occurs between 9.80 V and 10.20 V at test current I_ZT = 5 mA. It is not rated for sustained operation above 10.20 V in reverse bias; exceeding this risks thermal runaway if power dissipation exceeds 350 mW.

Is BZT585B10TQ compatible with lead-free reflow soldering processes?

Yes. The device uses matte tin–annealed Alloy 42 leads and is fully RoHS 3 compliant (2015/863/EU). It meets J-STD-020 moisture sensitivity level 1 and is qualified for standard Pb-free reflow profiles with peak temperatures up to 260 °C, per Diodes Incorporated's packaging specifications.

How does the +7.0 mV/°C temperature coefficient affect circuit performance?

The +7.0 mV/°C coefficient means the Zener voltage increases by approximately 7 mV per degree Celsius rise in junction temperature. In a 10 V reference, this yields ~0.07% drift per °C-critical for high-accuracy applications; designers must either operate within narrow ambient ranges or implement TC compensation using complementary components.

Can BZT585B10TQ be used in place of a 10 V Zener with different package types?

Direct substitution requires verifying mechanical fit, thermal performance, and electrical behavior. While electrically similar to other 10 V Zeners, its SOD523 footprint (0.80 mm × 0.60 mm) differs from SOD-123 or SOT-23. Thermal resistance (357 °C/W) is higher than larger packages, so power derating must be applied if replacing higher-P_D variants in thermally demanding layouts.