Diodes Incorporated BZT585B12T-7

Overview

BZT585B12T-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal 12 V breakdown voltage (11.76–12.24 V at 5 mA), ±2.0% tolerance, 350 mW power dissipation, and SOD523 package. It provides stable voltage reference and overvoltage protection in low-power analog circuits, power supply feedback loops, and sensor biasing networks.

For engineers reviewing the BZT585B12T-7 datasheet, BZT585B12T-7 pinout, BZT585B12T-7 application, or BZT585B12T-7 equivalent, key selection criteria include Zener voltage accuracy, low dynamic impedance (10 Ω @ 5 mA), temperature coefficient (+9.5 mV/°C), reverse leakage (<0.1 µA @ 9.6 V), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage. Its flat-lead SOD523 package enables high thermal efficiency on FR-4 PCBs, with R_θJA = 357 °C/W under standard pad layout.

The Zener exhibits a positive temperature coefficient of +9.5 mV/°C at 5 mA, indicating voltage increases with junction temperature-critical for thermal drift compensation in precision references. Maximum reverse current is limited to 0.1 µA at 9.6 V, ensuring minimal standby power loss in battery-sensitive designs.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-small, low-profile surface-mount plastic case with cathode band marking; dimensions: 1.60 × 0.80 × 0.65 mm (L × W × H); weight ≈ 0.001 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5242BT1G and BZX84-C12, BZT585B12T-7 offers tighter voltage tolerance, smaller SOD523 footprint, and AEC-Q101 qualification-making it optimal for space-constrained, automotive-grade voltage reference designs where long-term stability and qualification rigor are mandatory.

Availability

BZT585B12T-7 is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial PLC input protection, portable medical monitor biasing, and smart meter reference stability requiring stable component supply across extended temperature ranges and production lifecycles.

Supply support for BZT585B12T-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-reliability voltage reference and protection in automotive, industrial, and portable electronics where tight tolerance, low leakage, and AEC-Q101 compliance are essential.

FAQ

What is the maximum reverse voltage before breakdown for BZT585B12T-7?

The rated Zener voltage is 12.0 V with a guaranteed range of 11.76 V to 12.24 V at test current I_ZT = 5 mA. Breakdown occurs within this range under specified conditions; operation above 12.24 V at 5 mA is not guaranteed and may exceed thermal limits if power dissipation exceeds 350 mW.

Can BZT585B12T-7 be used in series or parallel configurations?

No-this Zener is designed for single-device shunt regulation. Series connection introduces mismatched temperature coefficients and voltage distribution issues; parallel use causes current hogging due to V_Z tolerances. For higher voltage or current, select a dedicated higher-voltage Zener or use active regulation instead.

Is the SOD523 package compatible with standard reflow profiles?

Yes-the SOD523 package is qualified for lead-free reflow per JEDEC J-STD-020, with Moisture Sensitivity Level 1. Standard peak temperatures up to 260°C are supported; recommended pad layout (AP02001) ensures thermal reliability and solder joint integrity during assembly.

How does the +9.5 mV/°C temperature coefficient affect circuit performance?

This positive coefficient means output voltage rises ~9.5 mV per °C rise in junction temperature. In closed-loop feedback systems, it introduces predictable thermal drift-enabling software compensation or pairing with negative-TC components to achieve net-zero drift in precision references.