Diodes Incorporated BZT585B15TQ-7

Overview

BZT585B15TQ from Diodes Incorporated is a precision Zener diode with 15 V nominal breakdown voltage (±2.0% tolerance), 350 mW power dissipation, and SOD523 surface-mount package. It operates across –65°C to +150°C, features 13.2 mV/°C temperature coefficient, and delivers stable voltage reference in automotive power rail monitoring and low-power sensor biasing circuits.

For engineers reviewing the BZT585B15TQ datasheet, BZT585B15TQ pinout, BZT585B15TQ application, or BZT585B15TQ equivalent, key selection criteria include Zener voltage accuracy, thermal stability at elevated ambient temperatures, low reverse leakage (<0.05 µA @ 10.5 V), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode uses silicon planar construction with tightly controlled doping to achieve ±2.0% V_Z tolerance at I_ZT = 5 mA. Its 13.2 mV/°C temperature coefficient ensures predictable drift over –65°C to +150°C operating range, critical for voltage reference stability in engine control units and ADAS power domains.

The device exhibits 15 Ω dynamic impedance at 5 mA test current and 200 Ω at knee current (I_ZK = 1 mA), enabling precise regulation under both nominal and light-load conditions. Its 100 pF capacitance at 0 V bias supports fast transient response in feedback networks without compromising noise immunity.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact, flat-lead surface-mount package with cathode band marking; molded green compound (UL 94V-0), 0.001 g weight, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5245B-TP and BZX84-C15, BZT585B15TQ offers tighter voltage tolerance, automotive qualification, and smaller SOD523 footprint-making it optimal for next-generation ECU and ADAS modules where precision, reliability, and miniaturization are jointly constrained.

Availability

BZT585B15TQ is available at Aetrix Electronics and suitable for automotive power monitoring, ADAS sensor biasing, infotainment surge protection, and EPS interface stabilization requiring stable component supply across production lifecycles.

Supply support for BZT585B15TQ 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 and manufacturing facilities across Asia and the Americas.

The BZT585 series belongs to Diodes' AEC-Q101-qualified Zener portfolio, engineered specifically for automotive voltage reference and clamping applications demanding high precision, thermal stability, and long-term reliability under harsh environmental stress.

FAQ

What is the maximum reverse voltage before breakdown for BZT585B15TQ?

The BZT585B15TQ has a nominal Zener voltage of 15.0 V with a guaranteed range of 14.7 V to 15.3 V at 5 mA test current. Breakdown occurs within this range under specified test conditions; operation above 15.3 V risks exceeding power limits unless current is strictly limited per derating curves.

Is BZT585B15TQ compatible with lead-free reflow soldering processes?

Yes. The device uses matte tin annealed terminations over Alloy 42 leadframe and is fully RoHS 3 compliant. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for standard Pb-free reflow profiles up to 260°C peak temperature.

How does the temperature coefficient affect regulation accuracy over automotive temperature ranges?

With a +13.2 mV/°C coefficient, V_Z increases by approximately 2.0 V from –40°C to +125°C. This predictable drift allows system designers to compensate in firmware or select complementary components, unlike uncharacterized Zeners that exhibit nonlinear behavior.

Can BZT585B15TQ replace older Zener diodes like 1N4744A in existing designs?

No direct drop-in replacement: BZT585B15TQ uses SOD523 (1.25 mm × 0.85 mm), while 1N4744A is DO-41 (5.2 mm × 2.7 mm). Electrical differences include tighter tolerance (±2.0% vs. ±5%), lower power (350 mW vs. 1 W), and AEC-Q101 qualification-requiring PCB layout and thermal redesign.