Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Diodes Incorporated ZRA245F03TA

Name: ZRA245F03TA
Brand: Diodes Incorporated
SKU: ZRA245F03TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZRA245F03TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZRA245F03TA.pdf

Description:: IC VREF SHUNT 3% SOT23

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,384

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ZRA245F03TA from Zetex Semiconductors (now Diodes Incorporated) is a precision 2.45 V bandgap voltage reference IC in SOT23-3 package, designed for low-power, space-constrained analog signal conditioning and calibration circuits. It delivers ±3% initial tolerance, 15 ppm/°C typical temperature coefficient, 0.26 Ω typical slope resistance, operates from 2 mA to 120 mA, and requires no external stabilization capacitor.

For engineers reviewing the ZRA245F03TA datasheet, ZRA245F03TA pinout, ZRA245F03TA application, or ZRA245F03TA equivalent, this device is selected for high-stability reference needs in portable instrumentation, battery-powered data acquisition, and precision power supply feedback loops where low quiescent current and capacitive load immunity are critical.

Technical Context

The ZRA245F03TA functions as a two-terminal shunt voltage reference, operating in reverse breakdown mode with cathode-anode polarity. Its bandgap core ensures stable 2.45 V output across −40°C to +85°C, with minimal drift due to its 15 ppm/°C TC and low dynamic impedance (0.28 Ω typical at 100 Hz).

It maintains regulation without an external capacitor and remains stable driving capacitive loads up to 1 µF. The device's 0.26 Ω slope resistance enables predictable current–voltage behavior under varying load conditions, supporting accurate current-source-based biasing in precision op-amp circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.45 V nominal; ±3% initial accuracy ensures calibrated ADC/DAC reference within 73.5 mV absolute error at 25°C.
Temp. Coefficient	15 ppm/°C typical; contributes ≤±1.2 mV drift over −40°C to +85°C, enabling <0.05% full-scale error in metering systems.
Slope Resistance	0.26 Ω typical; allows precise current-sensing control and minimizes output voltage shift under load current changes.
Operating Current	2 mA to 120 mA; supports ultra-low-power sensor nodes (2 mA) and higher-current reference buffers (120 mA) without external components.
Dynamic Impedance	0.28 Ω at 100 Hz; ensures low noise coupling and fast transient response in closed-loop feedback paths.
Wideband Noise	65 µV(rms), 10 Hz–10 kHz; suitable for 16-bit+ data acquisition where reference noise directly limits effective resolution.

Pinout & Package

SOT23-3 package (suffix F), 3-pin surface-mount, small-outline transistor outline. Pin 1 is floating or connected to Pin 2 per internal configuration; Pin 2 is cathode (output/reference node); Pin 3 is anode (ground return). Device operates in reverse-biased mode.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	NC or Cathode Tie	Internally unconnected or bonded to Pin 2; no external connection required unless specified by board layout for thermal or parasitic control.
Pin 2	Cathode (V_REF)	Output node providing 2.45 V reference; connects to non-inverting input of op-amps or REF pin of ADCs.
Pin 3	Anode (GND)	Ground return path; must be low-impedance to minimize IR drop affecting reference accuracy.

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference design in space-limited PCBs, eliminating BOM cost and layout risk of capacitor selection.
Stable with capacitive loads	Supports direct connection to ADC reference inputs or op-amp feedback networks with >100 pF parasitic capacitance without oscillation.
Industrial temperature range	Guarantees 2.45 V ±3% operation from −40°C to +85°C, meeting EN 50155 and IEC 61000-6-2 environmental requirements.
Low slope resistance	0.26 Ω enables <0.1 mV output shift per 0.4 mA load change-critical for ratiometric sensor excitation circuits.

Applications

Battery-Powered Multimeters

Precision RTD Signal Conditioning

Use Scenario: Handheld digital multimeter measuring DC voltage with 0.1% basic accuracy.

IC Role / Device Role / Timing Role: Shunt reference providing stable 2.45 V for ADC reference and internal calibration offset correction.

Use Value: ±3% initial tolerance and 15 ppm/°C TC ensure measurement repeatability across battery discharge cycles and ambient temperature shifts.

Use Scenario: 4-wire RTD bridge circuit in industrial temperature transmitter.

IC Role / Device Role / Timing Role: Precision excitation current source reference (via op-amp + MOSFET) for constant-current RTD drive.

Use Value: 0.26 Ω slope resistance enables sub-0.01% current regulation stability over 2–120 mA operating range.

Portable Data Loggers

Programmable Logic Controller (PLC) Analog Input Modules

Use Scenario: Solar-powered environmental sensor node logging temperature/humidity with 16-bit SAR ADC.

IC Role / Device Role / Timing Role: Low-noise (65 µV rms), capacitor-free reference for ADC conversion and sensor signal chain gain calibration.

Use Value: Eliminates need for external decoupling capacitor, reducing component count and improving long-term reliability in unattended deployments.

Use Scenario: DIN-rail mounted PLC module digitizing 4–20 mA process signals with galvanically isolated inputs.

IC Role / Device Role / Timing Role: Isolated-side reference for sigma-delta ADC front-end, referenced to isolated ground plane.

Use Value: Stable operation up to 120 mA supports integrated reference buffer stages while maintaining <0.02% total unadjusted error over full industrial temperature range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDBVR	2.5 V nominal, ±0.5% initial tolerance, 30 ppm/°C TC, requires external cathode resistor for bias.	Higher accuracy but tighter TC spec; demands external resistor network for current setting and lacks ZRA245F03TA's capacitor-free stability.	Select when 2.5 V output and tighter initial tolerance outweigh added component count and layout complexity.
LM4040C25IDBZR	2.5 V nominal, ±0.5% tolerance, 100 ppm/°C TC, fixed 2.5 V only, 50 µA min current.	Lower quiescent current but significantly higher TC; unsuitable for wide-temperature industrial environments without calibration.	Prefer for ultra-low-power IoT sensors where temperature range is limited to 0–70°C and 2.5 V matches system architecture.

Compared with TL431ACDBVR and LM4040C25IDBZR, the ZRA245F03TA offers superior temperature stability (15 vs. 30/100 ppm/°C) and true capacitor-free operation-making it optimal for ruggedized, space-constrained analog front-ends where layout simplicity and thermal robustness are prioritized over sub-1% initial accuracy.

Availability

ZRA245F03TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and precision analog signal chains requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZRA245F03TA 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 industrial and automotive markets before integration into Diodes' precision analog portfolio.

The ZRA245 series belongs to Diodes' legacy precision shunt reference product line, engineered specifically for low-drift, low-noise, capacitor-free operation in portable and industrial measurement systems demanding long-term stability without trimming.

FAQ

What is the maximum capacitive load the ZRA245F03TA can drive without instability?

The ZRA245F03TA is characterized as stable with capacitive loads up to 1 µF, per manufacturer test data and application notes. This capability eliminates need for series isolation resistors in ADC reference inputs or op-amp feedback paths, simplifying design and improving noise immunity in high-resolution data acquisition systems.

Can ZRA245F03TA replace a Zener diode in existing designs?

Yes-it is a direct functional upgrade over standard 2.4 V Zeners, offering tighter tolerance (±3% vs. ±5–10%), lower TC (15 ppm/°C vs. 50–100 ppm/°C), and guaranteed stability without external capacitor. Layout changes are minimal: same SOT23 footprint, cathode/anode orientation preserved.

Does ZRA245F03TA require a minimum load current to maintain regulation?

Yes-the device requires ≥2 mA operating current to maintain specified voltage accuracy and TC performance. Below 2 mA, reference voltage may deviate beyond ±3% and TC degrades; design must ensure bias network delivers ≥2 mA even at lowest input voltage or highest temperature.

Is ZRA245F03TA RoHS compliant and halogen-free?

Yes-ZRA245F03TA is manufactured per Diodes Incorporated's standard RoHS-compliant and halogen-free specifications (per Diodes Product Compliance Bulletin DPC-001), with lead-free matte-tin plating and fully traceable material declarations available upon request.

ZRA245F03TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.45V

Voltage - Output (Max):: -

Current - Output:: 120 mA

Tolerance:: ±3%

Temperature Coefficient:: 50ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 65µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 2 mA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZRA245F03TA FAQ

1.How can I place an order for ZRA245F03TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRA245F03TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZRA245F03TA reliable?

The price and inventory of ZRA245F03TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRA245F03TA is usually 5 days.

3.What payment methods are accepted for ZRA245F03TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRA245F03TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRA245F03TA?

ZRA245F03TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRA245F03TA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZRA245F03TA?

For technical support, including ZRA245F03TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRA245F03TA requirements.

6.How does Aetrix verify that ZRA245F03TA is sourced from the original manufacturer or authorized distributors?

All ZRA245F03TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZRA245F03TA meets industry standards.

7.What is the process for return or replacement of ZRA245F03TA?

All ZRA245F03TA units undergo pre-shipment inspection (PSI). If there is an issue with ZRA245F03TA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZRA245F03TA part is unused and in its original packaging.

Return procedure for ZRA245F03TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…