Diodes Incorporated BZT585B13T-7

Overview

BZT585B13T-7 from Diodes Incorporated is a precision surface-mount Zener diode with nominal 13 V breakdown voltage (12.74–13.26 V at 5 mA), ±2.0% tolerance, 350 mW power dissipation, and 10 Ω dynamic impedance at test current. It operates from –65 °C to +150 °C and is used for voltage regulation and reference in low-power analog circuits, such as sensor biasing and ADC reference stabilization.

For engineers reviewing the BZT585B13T-7 datasheet, BZT585B13T-7 pinout, BZT585B13T-7 application, or BZT585B13T-7 equivalent, key selection criteria include Zener voltage accuracy, thermal stability (10.7 mV/°C TC), low capacitance (105 pF), and AEC-Q101 qualification for automotive-grade reliability in space-constrained designs.

Technical Context

This Zener diode employs silicon planar construction with tight voltage distribution control to achieve ±2.0% initial tolerance and stable temperature coefficient of +10.7 mV/°C at 5 mA. Its SOD523 package enables high power density (350 mW) despite sub-2 mm footprint.

The device exhibits low reverse leakage (≤0.1 µA at 10.4 V), 105 pF junction capacitance at 0 V, and forward voltage of 0.9 V at 10 mA - enabling use in both regulation and clamping roles where low dynamic impedance (10 Ω @ I_ZT) and fast response are required.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-small, flat-lead surface-mount plastic case (1.6 × 0.8 × 0.6 mm), UL 94V-0 rated, moisture sensitivity level 1, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5243BT1G and BZX84-C13, BZT585B13T-7 delivers tighter voltage control (±2.0% vs. ±5%), smaller footprint (SOD523), and automotive qualification - making it optimal for space-constrained, high-reliability analog references where regulation accuracy and thermal stability are critical.

Availability

BZT585B13T-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial ADC reference design, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZT585B13T-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, 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 regulation in automotive, industrial, and portable electronics where tight tolerance, low capacitance, and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum reverse voltage before breakdown for BZT585B13T-7?

The BZT585B13T-7 has a nominal Zener voltage of 13.0 V with a guaranteed range of 12.74 V to 13.26 V at 5 mA test current. Breakdown occurs within this range under specified conditions; operation above 13.26 V at 5 mA is not defined, and exceeding absolute maximum ratings may cause irreversible damage.

Is BZT585B13T-7 suitable for use in automotive applications?

Yes - BZT585B13T-7 is explicitly qualified to AEC-Q101 standards for high-reliability automotive use. It operates across –65 °C to +150 °C, features halogen- and antimony-free "Green" packaging, and meets JEDEC moisture sensitivity level 1, making it appropriate for under-hood and cabin ECUs.

How does the temperature coefficient affect regulation accuracy over temperature?

With a +10.7 mV/°C temperature coefficient at 5 mA, the Zener voltage increases linearly with junction temperature. Over a 100 °C rise (e.g., –40 °C to +60 °C ambient), voltage shift is ~1.07 V - requiring system-level compensation or selection of adjacent voltage grades if total drift must stay below ±1%.

Can BZT585B13T-7 replace a 1N4742A in existing designs?

No - the 1N4742A is a through-hole 12 V Zener in DO-41 package (1 W P_D). BZT585B13T-7 is a 13 V, 350 mW, SOD523 surface-mount device with different voltage, power, package, and thermal characteristics. Direct substitution would require PCB redesign, thermal analysis, and validation of voltage tolerance impact on system performance.