Diodes Incorporated ZR40402F25TA

Overview

ZR40402F25TA from Diodes Incorporated is a precision 2.5 V micropower shunt voltage reference IC in SOT23-3 package, designed for low-current biasing of analog signal chains and ADC/DAC reference nodes. It delivers 0.5% initial tolerance, 30 ppm/°C typical temperature coefficient, and operates stably from 60 µA to 15 mA without external capacitor. Used in battery-powered multimeters and portable data loggers.

For engineers reviewing the ZR40402F25TA datasheet, ZR40402F25TA pinout, ZR40402F25TA application, or ZR40402F25TA equivalent, key selection criteria include reverse breakdown voltage stability across −40°C to +85°C, slope resistance ≤0.4 Ω, transient settling <10 µs, and compatibility with capacitive loads up to 1 µF.

Technical Context

The ZR40402F25TA implements a bandgap-based shunt topology, regulating output by sinking current through its cathode–anode path to maintain 2.5 V across external load. Its internal curvature-compensated core achieves low TC without trimming resistors.

It functions as a two-terminal device requiring only an external series resistor for biasing, supports capacitive loads up to 1 µF without oscillation, and maintains regulation under transient load steps due to sub-10 µs response time and 0.4 Ω dynamic impedance.

Key Specifications

Pinout & Package

SOT23-3 package (suffix "F"), 1.3 mm × 2.9 mm footprint, 1.1 mm height, surface-mount, JEDEC MO-178 compliant. Pin 1 (cathode) and Pin 2 (anode) are functional; Pin 3 is floating or internally connected to Pin 2 per datasheet revision.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBVR and REF43 2.5, the ZR40402F25TA offers optimal balance of micropower operation (60 µA), SOT23 footprint, and 0.5% accuracy-making it ideal for compact, battery-sensitive designs where moderate TC is acceptable.

Availability

ZR40402F25TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and precision power supply monitoring requiring stable component supply and consistent parametric performance across production lots.

Supply support for ZR40402F25TA 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on high-reliability, energy-efficient solutions for industrial and consumer markets.

The ZR4040 series belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-quiescent-current applications demanding stable 2.5 V references without external stabilization components.

FAQ

What is the maximum capacitive load the ZR40402F25TA can drive without instability?

The ZR40402F25TA remains stable with capacitive loads up to 1 µF, as verified in the manufacturer's transient response and phase margin characterization. This eliminates the need for series isolation resistors when driving ADC sample-and-hold capacitors or op-amp input stages, simplifying layout in portable measurement systems.

Can the ZR40402F25TA operate below 60 µA?

No-60 µA is the specified minimum operating current for guaranteed regulation and parameter compliance. Operation below this level may result in degraded TC, increased noise, or loss of regulation, especially at temperature extremes. Designs requiring sub-60 µA operation should consider alternative references like the MAX6002.

Is Pin 3 of the SOT23 package electrically active?

Pin 3 is not electrically active in the standard ZR40402F25TA configuration; it is either no-connect or internally tied to Pin 2 (anode) per the datasheet. PCB layout should treat it as NC unless explicitly configured otherwise in a custom variant.

How does the ZR40402F25TA handle transient overcurrent events?

The device withstands transient currents up to 200 mA due to rugged 20 V process technology, though sustained operation above 25 mA violates absolute maximum ratings. Transient immunity is validated for <10 µs pulses, supporting robustness against ESD-induced current surges in handheld equipment interfaces.