Diodes Incorporated BZT585B4V7T-7

Overview

BZT585B4V7T-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal 4.7 V breakdown voltage (±2.0% tolerance), 350 mW power dissipation, and SOD523 package. It provides stable voltage reference and overvoltage protection in low-power analog circuits, such as sensor biasing, ADC reference stabilization, and microcontroller reset circuitry.

For engineers reviewing the BZT585B4V7T-7 datasheet, BZT585B4V7T-7 pinout, BZT585B4V7T-7 application, or BZT585B4V7T-7 equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, low dynamic impedance (80 Ω at I_ZT), negative temperature coefficient (−1.2 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a precise DC voltage across its terminals under varying load or supply conditions. Its 4.7 V nominal zener voltage is specified at I_ZT = 5 mA, with maximum zener impedance of 80 Ω at that current and 500 Ω at knee current (I_ZK = 1 mA).

The device features a −1.2 mV/°C temperature coefficient near 4.7 V, enabling predictable drift compensation in temperature-sensitive references. Its 325 pF capacitance at 0 V and 1 MHz supports stable operation in low-frequency regulation, while the SOD523 package enables high-density PCB layouts with thermal resistance of 357 °C/W on FR-4.

Key Specifications

Pinout & Package

Two-terminal device in SOD523 package: anode and cathode. Cathode identified by band marking. No internal leads or multi-pin configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5225BS-7-F and BZX84-C4V7, the BZT585B4V7T-7 offers tighter voltage tolerance, higher power capability, lower dynamic impedance, and AEC-Q101 qualification-making it optimal for new automotive and precision analog designs where long-term stability and regulatory compliance are critical.

Availability

BZT585B4V7T-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, microcontroller reset circuits, ADC reference stabilization, and low-power IoT node regulation requiring stable component supply and AEC-Q101 traceability.

Supply support for BZT585B4V7T-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-accuracy voltage reference and overvoltage protection in automotive, industrial, and portable electronics where compact size, thermal robustness, and qualification-grade reliability are essential.

FAQ

What is the maximum reverse current at 2 V for BZT585B4V7T-7?

The maximum reverse current (I_R) is 3 µA at V_R = 2 V and T_A = +25°C, per the Electrical Characteristics table. This low leakage ensures minimal quiescent power loss in battery-critical applications and maintains regulation integrity during standby modes.

Is BZT585B4V7T-7 suitable for automotive applications?

Yes - it is explicitly qualified to AEC-Q101 standards for high-reliability automotive use. Its SOD523 package, −65°C to +150°C operating range, and robust Zener characteristics make it appropriate for engine control, body electronics, and ADAS sensor subsystems.

How does the temperature coefficient affect regulation accuracy over temperature?

With a typical TC of −1.2 mV/°C, the zener voltage decreases linearly by ~0.12% per 10°C rise from 25°C. At +125°C, V_Z shifts ~−0.12 V (−2.5%), remaining within system-level tolerance budgets when paired with appropriate derating and layout practices.

Can BZT585B4V7T-7 replace a 5.1 V Zener in a 3.3 V logic interface?

No - it is rated for 4.7 V nominal breakdown and must be used only in circuits designed for that voltage. Substituting into a 5.1 V reference path would cause insufficient clamping and potential logic-level violation; use BZT585B5V1T-7 instead for 5.1 V applications.