Diodes Incorporated BZT585B4V3T-7

Overview

BZT585B4V3T-7 from Diodes Incorporated is a precision surface-mount Zener diode with nominal 4.3 V breakdown voltage (±2.0% tolerance), 90 Ω maximum Zener impedance at 5 mA, and −1.7 mV/°C temperature coefficient. It operates within −65 °C to +150 °C, dissipates up to 350 mW, and is packaged in SOD523 for space-constrained voltage regulation in low-power analog circuits.

For engineers reviewing the BZT585B4V3T-7 datasheet, BZT585B4V3T-7 pinout, BZT585B4V3T-7 application, or BZT585B4V3T-7 equivalent, key selection criteria include tight voltage tolerance, low thermal drift, small-footprint packaging, and AEC-Q101 qualification for automotive-grade reliability in biasing, reference, and overvoltage protection circuits.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse-biased breakdown mode. Its ±2.0% V_Z tolerance and −1.7 mV/°C TC ensure stable regulation across temperature, while the 90 Ω Z_ZT at 5 mA supports low-noise, low-drift reference generation in precision analog front-ends.

The SOD523 package enables high power density (350 mW) with minimal board area and low thermal resistance (357 °C/W). Cathode-band marking and matte tin-plated Alloy 42 leads ensure reliable solderability and compatibility with automated assembly processes per MIL-STD-202.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact, flat-lead surface-mount package measuring 1.50–1.70 mm length × 0.70–0.90 mm width × 0.25–0.35 mm height, 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 diode applications.

Compared with MMBZ5229BS-7-F and BZX84-C4V3, BZT585B4V3T-7 delivers tighter voltage control (±2.0% vs. ±5%), automotive qualification, and smallest footprint-making it optimal for next-generation compact, high-reliability analog systems.

Availability

BZT585B4V3T-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, portable device voltage reference, and industrial signal conditioning requiring stable component supply with guaranteed long-term availability.

Supply support for BZT585B4V3T-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, energy-efficient components for automotive, industrial, and consumer markets.

The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for applications demanding tight voltage tolerance, low thermal drift, and AEC-Q101 reliability in miniaturized surface-mount packages.

FAQ

What is the maximum power dissipation for BZT585B4V3T-7 under standard mounting conditions?

The BZT585B4V3T-7 is rated for 350 mW continuous power dissipation when mounted on an FR-4 PCB using Diodes Incorporated's recommended minimum pad layout (AP02001). Derating begins above +25 °C ambient, reaching zero dissipation at +150 °C per the published power derating curve.

Is BZT585B4V3T-7 suitable for automotive applications?

Yes-BZT585B4V3T-7 is qualified to AEC-Q101 standards, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor modules. Its operating temperature range (−65 °C to +150 °C) and green halogen-free construction meet automotive OEM requirements.

How does the −1.7 mV/°C temperature coefficient affect circuit performance?

The negative temperature coefficient means the Zener voltage decreases by 1.7 mV per degree Celsius rise. Over a 100 °C span (e.g., −40 °C to +60 °C), this results in ~170 mV total drift-less than 4% of 4.3 V. This behavior is predictable and can be compensated in closed-loop systems or accepted in applications where relative stability matters more than absolute value.

Can BZT585B4V3T-7 replace older Zener diodes in existing SOD-123 or SOT-23 designs?

No-BZT585B4V3T-7 uses the smaller SOD523 package (1.6 × 0.8 mm), which is not mechanically compatible with SOD-123 (3.7 × 1.6 mm) or SOT-23 (3.0 × 1.4 mm) footprints. PCB redesign and requalification are required; electrical substitution alone is insufficient due to dimensional mismatch and thermal profile differences.