Diodes Incorporated ZRA245F01TA

Overview

ZRA245F01TA from Zetex Semiconductors (now Diodes Incorporated) is a precision 2.45 V bandgap voltage reference IC in SOT23-3 package, designed for low-power analog signal conditioning and calibration circuits. It delivers ±1% initial tolerance, 15 ppm/°C typical temperature coefficient, 0.26 Ω slope resistance, operates from 2 mA to 120 mA, and requires no external stabilization capacitor - enabling compact, stable reference design in portable instrumentation.

For engineers reviewing the ZRA245F01TA datasheet, ZRA245F01TA pinout, ZRA245F01TA application, or ZRA245F01TA equivalent, key selection criteria include its 2.45 V output accuracy across −40°C to +85°C, capacitive-load stability without compensation, low noise (65 µV_rms, 10 Hz–10 kHz), and compatibility with battery-powered measurement systems requiring long-term drift control.

Technical Context

The ZRA245F01TA functions as a two-terminal shunt voltage reference, sinking current to maintain a precise 2.45 V reverse breakdown voltage across its anode–cathode terminals. Its bandgap-based core ensures monotonic temperature behavior and minimal hysteresis over repeated thermal cycles.

It achieves stability with purely capacitive loads up to 10 µF and exhibits low dynamic impedance (0.28 Ω typical at 100 Hz), making it suitable for feedback nodes in precision regulators and ADC reference buffers where load transients must not perturb reference integrity.

Key Specifications

Pinout & Package

Package: SOT23-3 (suffix F), plastic surface-mount case with gull-wing leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height; RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBVR and LM4040C24IDBZR, the ZRA245F01TA uniquely combines exact 2.45 V output, ±1% tolerance, low TC, and capacitor-free stability - making it irreplaceable in metrology-grade portable instruments calibrated to that specific voltage point.

Availability

ZRA245F01TA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and industrial analog front-ends requiring stable component supply with guaranteed long-term continuity.

Supply support for ZRA245F01TA 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

Zetex Semiconductors, acquired by Diodes Incorporated in 2008, specialized in high-performance analog and discrete semiconductors for precision, power, and interface applications.

The ZRA245 series was developed specifically for portable and battery-operated measurement systems needing accurate, low-drift, capacitorless voltage references in miniature packages.

FAQ

Can ZRA245F01TA be used as a series voltage reference?

No. The ZRA245F01TA is a two-terminal shunt reference and must be connected in parallel with the load, sinking current from a current-limited source. It lacks a series-pass element or three-terminal architecture required for series regulation. Attempting series configuration will prevent proper biasing and cause functional failure.

What is the maximum allowable reverse voltage before damage occurs?

The absolute maximum reverse voltage is not specified, but the device is rated for 200 mA reverse current. Exceeding 2.52 V (maximum VR at 25°C) under load risks thermal runaway if current-limiting resistance is insufficient. Safe operation requires maintaining VR within 2.38–2.52 V across the full temperature and current range per datasheet limits.

Does pin 3 (NC) require PCB trace routing or grounding?

No. Pin 3 is internally unconnected in the SOT23-3 variant (suffix F). It may be left floating on the PCB or tied to pin 2 (cathode) for mechanical reinforcement only - no electrical benefit or penalty results from either choice. No current path or parasitic coupling exists through this terminal.

How does ZRA245F01TA behave under transient load steps?

With its 0.26 Ω slope resistance and low dynamic impedance (0.28 Ω at 100 Hz), the ZRA245F01TA exhibits ≤26 µV output shift per 0.1 mA load step. Transient response settles within 10 µs (per typical characteristics curve), supporting use in multiplexed ADC systems where reference settling time directly impacts channel-to-channel crosstalk.