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

Diodes Incorporated ZRA245N803TA

Name: ZRA245N803TA
Brand: Diodes Incorporated
SKU: ZRA245N803TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRA245N803TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ZRA245N803TA.pdf

Description:: IC VREF SHUNT 3% 8SOP

Quantity:: RFQ Add To RFQ list

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Inventory:4,854

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Product details

Overview

ZRA245N803TA from Zetex Semiconductors (now Diodes Incorporated) is a precision 2.45 V bandgap voltage reference IC in SO8 package, rated for ±3% initial tolerance, 15 ppm/°C typical temperature coefficient, and stable operation from 2 mA to 120 mA load current without external capacitor. It serves as a low-drift, low-impedance reference in portable instrumentation and data acquisition systems.

For engineers reviewing the ZRA245N803TA datasheet, ZRA245N803TA pinout, ZRA245N803TA application, or ZRA245N803TA equivalent, key selection criteria include reverse breakdown stability under capacitive loads, slope resistance ≤0.5 Ω, wide operating current range, industrial temperature support (–40°C to +85°C), and SO8 thermal/power capability (625 mW at 25°C).

Technical Context

The ZRA245N803TA implements a two-terminal shunt reference topology using a bandgap-derived core, delivering fixed 2.45 V reverse breakdown with no series pass element. Its internal design ensures stability with capacitive loads up to 1 µF and eliminates need for external compensation.

It operates as a current-sink device: reference voltage is maintained across its terminals when reverse-biased with 2–120 mA current; output regulation relies on dynamic impedance (Z_R ≤1 Ω at 100 Hz) and low slope resistance (R_S = 0.26 Ω typ) to minimize load-induced drift.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.45 V nominal; ±3% initial accuracy ensures predictable biasing in ADC references and sensor excitation circuits.
Temp. Coefficient	15 ppm/°C typical; enables ≤0.37 mV drift over –40°C to +85°C, critical for metering-grade accuracy.
Slope Resistance	0.26 Ω typical; limits output voltage shift to <26 mV per 100 mA load change, supporting stable regulation under varying current.
Dynamic Impedance	0.28 Ω at 100 Hz; ensures minimal AC ripple coupling into reference node in noisy power environments.
Operating Current	2 mA to 120 mA; accommodates ultra-low-power sensors (e.g., 2 mA) and higher-drive analog front-ends (e.g., 100 mA DAC buffers).
Wideband Noise	65 µV_rms (10 Hz–10 kHz); suitable for 12-bit+ data acquisition where reference noise directly impacts ENOB.
Power Dissipation	625 mW (SO8, T_amb=25°C); supports sustained operation at 120 mA × 2.45 V ≈ 294 mW, leaving ample thermal margin.

Pinout & Package

SO8 package (suffix N8), surface-mount, 8-pin plastic small outline integrated circuit. Pin 1 is marked by notch or dot; functional configuration is two-terminal - anode and cathode only - with remaining pins unused or internally connected.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (A)	Main current entry point; connects to system ground or low-side return path in shunt configuration.
Pin 8	Cathode (K)	Reference output node; voltage of 2.45 V appears between Pin 8 and Pin 1 when reverse-biased with ≥2 mA.
Pins 2–7	No Connect / Internally Unused	Not bonded; electrically isolated - no routing or PCB trace required; improves layout simplicity and reduces parasitic coupling.

Key Features

Feature	Design Value
No external capacitor required	Enables direct integration into space-constrained PCBs (e.g., handheld multimeters) without stability-compensation components.
Stable with capacitive loads	Supports direct connection to ADC input caps (up to 1 µF) without oscillation, simplifying anti-aliasing filter design.
Low slope resistance (0.26 Ω)	Reduces load-regulation error to <0.1% across full 2–120 mA range, eliminating need for post-regulation buffering in many applications.
Industrial temperature range	Validated operation from –40°C to +85°C ensures reliability in field-deployed test equipment and industrial controllers.
Multiple package options	SO8 (N8) variant offers superior thermal dissipation vs. SOT23 or TO92, enabling higher continuous current in compact designs.

Applications

Portable Multimeter Reference

Battery-Powered Data Logger

Use Scenario: High-accuracy DC voltage measurement in handheld digital multimeters with auto-ranging and dual-slope ADC.

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

Use Value: ±3% initial tolerance and 15 ppm/°C TC ensure <±0.1% full-scale error over temperature, meeting Class II meter specifications.

Use Scenario: Long-duration environmental monitoring using coin-cell-powered microcontroller with integrated 12-bit SAR ADC.

IC Role / Device Role / Timing Role: Low-current shunt reference supplying 2.45 V to ADC reference input and sensor excitation circuitry.

Use Value: Stable operation down to 2 mA enables >1-year battery life while maintaining 12-bit linearity via 65 µV_rms noise floor.

Industrial Panel Meter Front-End

Calibration-Grade Signal Generator

Use Scenario: 4–20 mA loop-powered panel meter with local display and analog input conditioning.

IC Role / Device Role / Timing Role: Precision reference for current-sense amplifier gain setting and DAC output scaling in analog output stage.

Use Value: 0.26 Ω slope resistance minimizes gain drift across 4–20 mA load variation, improving loop accuracy to ±0.05% FS.

Use Scenario: Benchtop signal generator requiring programmable DC offset with <10 ppm stability over 8-hour warm-up.

IC Role / Device Role / Timing Role: Primary voltage reference for high-resolution DAC and trimming circuitry in offset calibration subsystem.

Use Value: 625 mW SO8 power rating allows continuous 100 mA bias current, reducing thermal hysteresis and improving 8-hour drift performance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACD (SO8)	Adjustable (2.5 V min), 2% initial tol, 50 ppm/°C max TC, requires external resistor divider.	Used where programmability or tighter tolerance not required; higher TC increases drift in wide-temp environments.	Select when adjustable output or cost sensitivity outweighs need for fixed 2.45 V and low-drift performance.
REF200AID (SO8)	Fixed 2.048 V, 0.5% tol, 20 ppm/°C max TC, 100 µA max quiescent current, not load-current scalable.	Optimized for ultra-low-power sensor nodes; cannot source >100 µA, limiting use in higher-drive analog stages.	Select only for sub-100 µA reference current applications; incompatible with ZRA245N803TA's 2–120 mA operational range.

Compared with TL431ACD and REF200AID, ZRA245N803TA uniquely combines fixed 2.45 V output, ±3% tolerance, low 15 ppm/°C TC, and full 2–120 mA load scalability in SO8 - making it optimal for portable instrumentation demanding both precision and drive capability.

Availability

ZRA245N803TA is available at Aetrix Electronics and suitable for portable instrumentation, industrial data loggers, and calibration-grade test equipment requiring stable component supply with guaranteed SO8 packaging and ±3% tolerance binning.

Supply support for ZRA245N803TA 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 and power-efficient applications.

The ZRA245 series was designed specifically for space-constrained, battery-operated measurement systems requiring stable, capacitor-free voltage references with industrial temperature resilience.

FAQ

What is the maximum capacitive load the ZRA245N803TA can drive without instability?

ZRA245N803TA is characterized stable with capacitive loads up to 1 µF, as confirmed in the manufacturer's transient response and frequency-domain impedance plots. This eliminates need for series isolation resistors in ADC reference buffer designs and supports direct connection to sampling capacitors in SAR and sigma-delta converters.

Can ZRA245N803TA be used in series (two-terminal) configuration only, or does it support three-terminal operation?

ZRA245N803TA is strictly a two-terminal shunt reference: anode (Pin 1) and cathode (Pin 8) define the reference node. Pins 2–7 are unconnected and must remain floating - no three-terminal or series-pass configuration is supported or electrically possible per internal construction and datasheet schematic.

How does the 2.45 V reference voltage relate to common ADC full-scale requirements like 2.048 V or 4.096 V?

The 2.45 V output is optimized for legacy and proprietary metrology systems requiring non-standard scaling (e.g., 2.45 V × 1000 = 2450 mV full scale). It is not intended as a drop-in replacement for 2.048 V references but enables custom gain-setting in ratiometric sensor interfaces and high-resolution differential measurements where 2.45 V provides optimal LSB resolution.

Is the SO8 package (N8 suffix) thermally superior to SOT23 or TO92 variants of ZRA245?

Yes - SO8 (N8) offers 625 mW power dissipation at 25°C versus 330 mW for SOT23 and 500 mW for TO92. Its larger copper area and multiple ground/power leads reduce thermal resistance by ~30%, enabling reliable 120 mA operation without derating in ambient temperatures up to 70°C - critical for high-current reference buffering.

ZRA245N803TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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:: 8-SO

ZRA245N803TA FAQ

1.How can I place an order for ZRA245N803TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRA245N803TA 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 ZRA245N803TA reliable?

The price and inventory of ZRA245N803TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRA245N803TA is usually 5 days.

3.What payment methods are accepted for ZRA245N803TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRA245N803TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRA245N803TA?

ZRA245N803TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRA245N803TA 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 ZRA245N803TA?

For technical support, including ZRA245N803TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRA245N803TA requirements.

6.How does Aetrix verify that ZRA245N803TA is sourced from the original manufacturer or authorized distributors?

All ZRA245N803TA 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 ZRA245N803TA meets industry standards.

7.What is the process for return or replacement of ZRA245N803TA?

All ZRA245N803TA units undergo pre-shipment inspection (PSI). If there is an issue with ZRA245N803TA, 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 ZRA245N803TA part is unused and in its original packaging.

Return procedure for ZRA245N803TA:

1.Submit a request within 90 days.

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

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