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

Diodes Incorporated ZRA245N801TA

Name: ZRA245N801TA
Brand: Diodes Incorporated
SKU: ZRA245N801TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRA245N801TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZRA245N801TA.pdf

Description:: IC VREF SHUNT 1% 8SOP

Quantity:: RFQ Add To RFQ list

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Inventory:4,997

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Product details

Overview

ZRA245N801TA from Zetex Semiconductors (now Diodes Incorporated) is a precision 2.45 V bandgap voltage reference IC in SO8 package, rated for ±1% 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 ZRA245N801TA datasheet, ZRA245N801TA pinout, ZRA245N801TA application, or ZRA245N801TA equivalent, key selection factors include its 0.26 Ω typical slope resistance, 65 µV(rms) wideband noise (10 Hz–10 kHz), industrial −40°C to +85°C operating range, and SO8 package compatibility with high-density PCB layouts.

Technical Context

The ZRA245N801TA operates as a two-terminal shunt reference, sinking current through its cathode while maintaining a precise 2.45 V reverse breakdown voltage across its terminals. Its bandgap core delivers inherent thermal stability, and its low dynamic impedance (0.28 Ω typical at 5 mA, 100 Hz) ensures minimal output perturbation under varying load conditions.

Unlike series references, it requires no input supply rail above the reference voltage - only a current source or resistor bias. It remains stable with capacitive loads up to at least 1 µF, eliminating need for external compensation, and exhibits monotonic forward characteristics down to 2 mA minimum operating current.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.45 V ±1% at 5 mA, enabling accurate ADC/DAC biasing and sensor excitation within tight error budgets
Temp. Coefficient	15 ppm/°C typical, limiting drift to ≤±1.2 mV over −40°C to +85°C for stable long-term calibration
Slope Resistance	0.26 Ω typical, minimizing output voltage shift under ±10 mA load variation (ΔV ≈ ±2.6 mV)
Wideband Noise	65 µV(rms), 10 Hz–10 kHz, suitable for 16-bit measurement systems where noise floor must stay below 1 LSB
Operating Current	2 mA to 120 mA, supporting both ultra-low-power portable use and higher-current precision regulator feedback paths
Power Dissipation	625 mW (SO8, Tamb=25°C), allowing ≥250 mW usable headroom at 85°C ambient with derating

Pinout & Package

SO8 package (suffix N8), surface-mount, 8-pin wide-body plastic DIP outline. Pin 1 is cathode (reference output), Pin 2 is anode (ground). Pins 3–8 are internally unconnected (NC) and electrically isolated per manufacturer connection diagrams.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Cathode (V_REF)	Output terminal - connects to load or feedback node; sinks current to maintain 2.45 V across device
Pin 2	Anode (GND)	Reference ground return path; must be low-impedance to avoid common-mode error in sensing circuits
Pins 3–8	No Connect (NC)	Unused, floating terminals - no internal connection; may be left unconnected or tied to ground for mechanical stability

Key Features

Feature	Design Value
No external capacitor required	Enables compact layout in space-constrained portable designs without stability trade-offs or BOM overhead
Stable with capacitive loads	Supports direct buffering with op-amps or driving of ADC reference inputs with >100 nF bypass capacitance
Low slope resistance (0.26 Ω)	Reduces load-regulation error to <0.1% over 100 mA current range, critical for multi-channel precision systems
Industrial temperature range	Validated operation from −40°C to +85°C ensures reliability in field-deployed test equipment and industrial sensors

Applications

Battery-Powered Multimeters

Precision Data Acquisition Front-Ends

Use Scenario: Handheld digital multimeter requiring stable 2.45 V reference for 200 mV full-scale ADC conversion.

IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for dual-slope or sigma-delta ADC.

Use Value: ±1% initial tolerance and 15 ppm/°C TC ensure <0.05% total error contribution over battery life and environmental range.

Use Scenario: 16-bit isolated analog input module for PLC I/O cards measuring 4–20 mA loop signals.

IC Role / Device Role / Timing Role: Primary reference for programmable gain instrumentation amplifier and SAR ADC reference buffer.

Use Value: 65 µV(rms) noise and 0.26 Ω slope resistance preserve ENOB >15.2 bits across full temperature range.

Portable Gas Analyzers

Calibration Standards for Field Test Sets

Use Scenario: Electrochemical gas sensor signal conditioning in battery-operated air quality monitors.

IC Role / Device Role / Timing Role: Bias reference for transimpedance amplifier and zero-calibration DAC in sensor front-end.

Use Value: Stable 2.45 V enables sub-ppm-level baseline repeatability between calibrations without active temperature compensation.

Use Scenario: Benchtop calibration source generating traceable 2.45 V outputs for verifying handheld calibrators.

IC Role / Device Role / Timing Role: Primary reference element in thermally stabilized reference divider network.

Use Value: Low TC and minimal hysteresis support <5 ppm/year long-term stability when aged and operated at constant current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDR	2.495 V nominal, ±0.5% tolerance, 50 ppm/°C max TC, requires external cathode resistor for bias	Higher reference voltage limits use in 2.5 V–based ADCs without level-shifting; wider TC increases drift in wide-temp environments	Select when 2.5 V reference suffices and tighter initial tolerance is prioritized over temperature stability
REF200AIDR	2.048 V nominal, ±0.2% tolerance, 25 ppm/°C max TC, fixed 100 µA output current sink	Lower voltage incompatible with 2.45 V system requirements; fixed current limits flexibility in bias design	Choose only if system architecture mandates 2.048 V and ultra-low drift is secondary to absolute accuracy at 25°C

Compared with TL431ACDR and REF200AIDR, the ZRA245N801TA uniquely delivers 2.45 V at ±1% with 15 ppm/°C TC in SO8 - matching legacy metering designs while offering lower noise and superior load regulation than the TL431, and correct voltage alignment unlike the REF200AIDR.

Availability

ZRA245N801TA is available at Aetrix Electronics and suitable for precision data acquisition systems, portable test equipment, and industrial sensor signal conditioning requiring stable component supply and long-lifecycle availability.

Supply support for ZRA245N801TA 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 metrology-grade shunt references in portable and battery-powered instrumentation, emphasizing low noise, minimal thermal drift, and capacitor-free stability.

FAQ

What is the maximum capacitive load the ZRA245N801TA can drive without oscillation?

The ZRA245N801TA is specified stable with capacitive loads up to at least 1 µF, as confirmed by transient response testing and application notes. No external series resistor or compensation network is required - this stability holds across the full −40°C to +85°C temperature range and 2 mA to 120 mA operating current.

Can the ZRA245N801TA be used in series with a resistor for adjustable output voltage?

No - the ZRA245N801TA is a two-terminal shunt reference and does not support series adjustment. Its output voltage is fixed at 2.45 V. To generate higher voltages, it must be used in conjunction with an op-amp configured as a non-inverting amplifier or current-to-voltage converter, not as a series-adjustable element.

Is pin 1 the anode or cathode on the SO8 package?

Pin 1 is the cathode (V_REF output) on the ZRA245N801TA SO8 package. Pin 2 is the anode (ground). This polarity is consistent across all ZRA245 variants and matches standard shunt reference convention - current flows into the cathode and out of the anode.

Does the ZRA245N801TA require a minimum load current to maintain regulation?

Yes - the ZRA245N801TA requires a minimum operating current of 2 mA to maintain regulation within specification. Below this, reverse breakdown voltage drops significantly; at 1 mA, VR typically falls below 2.35 V. A series bias resistor must be sized to ensure ≥2 mA flows through the device under worst-case supply and load conditions.

ZRA245N801TA 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:: ±1%

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

ZRA245N801TA FAQ

1.How can I place an order for ZRA245N801TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRA245N801TA 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 ZRA245N801TA reliable?

The price and inventory of ZRA245N801TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRA245N801TA is usually 5 days.

3.What payment methods are accepted for ZRA245N801TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRA245N801TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRA245N801TA?

ZRA245N801TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRA245N801TA 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 ZRA245N801TA?

For technical support, including ZRA245N801TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRA245N801TA requirements.

6.How does Aetrix verify that ZRA245N801TA is sourced from the original manufacturer or authorized distributors?

All ZRA245N801TA 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 ZRA245N801TA meets industry standards.

7.What is the process for return or replacement of ZRA245N801TA?

All ZRA245N801TA units undergo pre-shipment inspection (PSI). If there is an issue with ZRA245N801TA, 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 ZRA245N801TA part is unused and in its original packaging.

Return procedure for ZRA245N801TA:

1.Submit a request within 90 days.

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

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