Diodes Incorporated BZT585B2V4TQ-7

Overview

BZT585B2V4TQ from Diodes Incorporated is a precision Zener diode with 2.4 V nominal breakdown voltage, ±2.0% tolerance, 350 mW power dissipation, and SOD523 package-designed for voltage regulation and reference in space-constrained automotive and industrial circuits.

For engineers reviewing the BZT585B2V4TQ datasheet, BZT585B2V4TQ pinout, BZT585B2V4TQ application, or BZT585B2V4TQ equivalent, key selection criteria include Zener voltage accuracy at 5 mA test current, low dynamic impedance (100 Ω @ 5 mA), temperature coefficient (–1.3 mV/°C), and AEC-Q101 qualification for automotive use.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its –1.3 mV/°C temperature coefficient ensures predictable drift over –65°C to +150°C operating range, and its 450 pF capacitance at 1 MHz supports low-noise biasing in analog sensing paths.

The device delivers precise regulation at 5 mA test current with 2.35–2.45 V Zener voltage window and exhibits low leakage (<50 µA @ 1 V reverse) and fast response to transient overvoltage events due to its optimized junction design and low thermal resistance (357 °C/W).

Key Specifications

Pinout & Package

Two-terminal device in SOD523 package: cathode marked by band on top surface; anode and cathode terminals are co-planar, matte tin-plated alloy 42 leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4678T1G and BZX84-C2V4, BZT585B2V4TQ offers superior voltage accuracy (±2.0% vs. ±5%), smaller SOD523 footprint (1.25 × 0.85 mm), and AEC-Q101 qualification-making it optimal for next-gen automotive and miniaturized industrial sensors where precision and reliability are non-negotiable.

Availability

BZT585B2V4TQ is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor signal conditioning, wearable health monitors, and smart meter battery backup circuits requiring stable component supply with guaranteed long-term availability.

Supply support for BZT585B2V4TQ 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 components for automotive, industrial, and consumer markets.

The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for AEC-Q101-compliant voltage reference and regulation in space-constrained, thermally demanding environments.

FAQ

What is the maximum reverse current specification for BZT585B2V4TQ at 1 V?

The maximum reverse current (I_R) is 50 µA at V_R = 1 V, measured at 25°C. This low leakage supports energy-efficient operation in always-on sensor nodes and extends battery life in portable applications where standby current must remain below 100 µA.

Is BZT585B2V4TQ compatible with lead-free reflow soldering processes?

Yes-BZT585B2V4TQ features matte tin annealed terminals over Alloy 42 leadframe and is fully RoHS 3 compliant. It meets MIL-STD-202 Method 208 solderability requirements and is rated for peak reflow temperatures up to 260°C per J-STD-020 Level 1 moisture sensitivity classification.

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

With a typical TC of –1.3 mV/°C, BZT585B2V4TQ drifts approximately –130 mV from –40°C to +125°C. When used with TC-matched resistors or in closed-loop feedback, this enables <±1.5% total voltage error across the full AEC-Q101 temperature range.

Can BZT585B2V4TQ be used in place of a 2.5 V Zener in existing designs?

No-its 2.4 V nominal Zener voltage falls outside typical 2.5 V reference tolerances (±1% or ±2%). Substituting it risks undervoltage lockout or incorrect comparator thresholds; redesign of current-limiting resistor and validation of downstream logic thresholds is required for any voltage change.