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

Diodes Incorporated ZRC500A03STOA

Name: ZRC500A03STOA
Brand: Diodes Incorporated
SKU: ZRC500A03STOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC500A03STOA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: ZRC500A03STOA.pdf

Description:: IC VREF SHUNT 3% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:3,693

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Product details

Overview

ZRC500A03STOA from Diodes Incorporated is a precision 5.0 V bandgap voltage reference IC with ±3% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 25 µA to 5 mA, requires no external capacitor, and achieves stable output in <10 µs-ideal for low-power battery-operated instrumentation and portable metering systems.

For engineers reviewing the ZRC500A03STOA datasheet, ZRC500A03STOA pinout, ZRC500A03STOA application, or ZRC500A03STOA equivalent, key selection criteria include knee current (19 µA typ), load stability without capacitance, transient response under 10 µs, TC performance across –40°C to +85°C, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZRC500A03STOA implements a two-terminal shunt reference topology using a bandgap-derived core, delivering regulated 5.0 V reverse breakdown voltage at currents from 19 µA to 25 mA. Its low 0.4 Ω dynamic impedance and 105 µV_rms wideband noise (10 Hz–10 kHz) support high-accuracy analog signal conditioning.

It exhibits monotonic temperature drift (±30 ppm/°C typ) over –40°C to +85°C, with guaranteed stability into capacitive loads and immunity to transients up to 200 mA peak. The device's 10 µs settling time enables use in fast-cycling ADC biasing and power-supply monitor circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±3% at 150 µA - defines absolute accuracy of reference for 12-bit+ ADC calibration
Temp Coefficient	30 ppm/°C typ - ensures ≤1.5 mV drift over full industrial temperature range
Knee Current	19 µA typ - enables operation in ultra-low-power sleep modes without dropout
Slope Resistance	0.4 Ω typ - minimizes load-induced voltage shift under varying current draw
Transient Response	<10 µs to settle - supports rapid power-up sequencing in portable devices
Noise (10Hz–10kHz)	105 µV_rms - preserves SNR in precision sensor front-ends and DAC references
Operating Current Range	25 µA to 5 mA - covers standby monitoring and active measurement phases

Pinout & Package

Package: SOT23-3 (suffix 'F'), lead-free, RoHS-compliant surface-mount package with thermal pad omitted. Pin 1 = Anode (input), Pin 2 = Cathode (output/reference), Pin 3 = NC (no connect, internally floating per datasheet).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Current input terminal	Accepts regulated current from series resistor; must be biased above 5.0 V to activate reference
Pin 2 (Cathode)	Reference output node	Provides stable 5.0 V sink point; connects to load and feedback networks
Pin 3 (NC)	No internal connection	Electrically isolated; may be left unconnected or grounded for mechanical stability only

Key Features

Feature	Design Value
No external capacitor required	Enables direct integration into compact PCB layouts without stability-compromising bypass components
Low knee current (19 µA)	Permits use with high-value bias resistors in energy-harvesting and coin-cell applications
Stable into capacitive loads	Eliminates need for isolation resistors when driving ADC sample-and-hold or op-amp inputs
Fast 10 µs transient response	Supports burst-mode sensing and wake-on-event architectures without reference settling delay
Rugged 200 mA surge rating	Withstands ESD and inductive kickback in industrial I/O modules without external protection

Applications

Battery-Powered Multimeters

Portable Gas Detectors

Use Scenario: Handheld digital multimeter requiring stable 5.0 V reference for 16-bit sigma-delta ADC during 100 ms auto-ranging cycles.

IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing ratiometric excitation and ADC reference simultaneously.

Use Value: 30 ppm/°C TC and 105 µV noise ensure <0.01% measurement linearity across –10°C to +50°C ambient.

Use Scenario: Low-power electrochemical gas sensor node operating on CR2032 battery with 10-year shelf life target.

IC Role / Device Role / Timing Role: Precision bias source for transimpedance amplifier and ADC reference in analog front-end.

Use Value: 19 µA knee current allows continuous sensor biasing while drawing <1 µA average system current in sleep mode.

Industrial Panel Meters

Smart Electricity Meters

Use Scenario: DIN-rail mounted 4–20 mA loop-powered panel meter with local display and RS-485 interface.

IC Role / Device Role / Timing Role: Primary voltage reference for isolated analog input channel and microcontroller VREF.

Use Value: Stable 5.0 V output under 5 mA load and 85°C ambient enables consistent 12-bit conversion accuracy without derating.

Use Scenario: Class 0.5 electricity meter requiring metrology-grade reference for polyphase energy measurement ASIC.

IC Role / Device Role / Timing Role: Secondary reference for calibration offset correction and tamper-detection comparator thresholds.

Use Value: 0.4 Ω slope resistance prevents >0.2 mV error under 500 µA load variation from internal metrology circuit switching.

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, adjustable via resistive divider; 20 ppm/°C max TC; requires external resistor network	Used where programmable reference or higher output flexibility is needed	Select if system already uses TL431-based feedback and 2.5 V base reference suffices
LM4040CIM3-5.0	5.0 V fixed, ±0.5% initial tolerance; 100 ppm/°C max TC; 75 µV_rms noise; 60 µA knee current	Preferred where tighter initial accuracy outweighs higher knee current and slower transient response	Choose when calibration budget allows tighter initial tolerance but board space permits larger bias resistor

Compared with TL431ACDBVR and LM4040CIM3-5.0, the ZRC500A03STOA offers superior low-current operation (19 µA vs. ≥60 µA), faster settling (<10 µs vs. ≥50 µs), and lower dynamic impedance (0.4 Ω vs. ≥0.8 Ω), making it optimal for space- and power-constrained portable instrumentation.

Availability

ZRC500A03STOA is available at Aetrix Electronics and suitable for battery-powered test equipment, portable instrumentation, and industrial metering systems requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZRC500A03STOA 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The ZRC500 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, space-constrained applications demanding stable 5.0 V references without external compensation.

FAQ

Is ZRC500A03STOA a three-terminal or two-terminal device?

ZRC500A03STOA is a two-terminal shunt voltage reference: Pin 1 (anode) and Pin 2 (cathode) form the functional terminals. Pin 3 is internally unconnected and serves only mechanical anchoring-no electrical function. Operation requires external current limiting via a series resistor.

Can ZRC500A03STOA drive a 10 nF capacitive load directly?

Yes-the ZRC500A03STOA is explicitly characterized as stable with capacitive loads and requires no external stabilization capacitor. Datasheet testing confirms stability into ≥10 nF loads, enabling direct connection to ADC sample-and-hold inputs and op-amp reference pins without isolation resistors.

What is the maximum safe operating current for continuous use?

The absolute maximum continuous operating current is 25 mA per datasheet Absolute Maximum Ratings. However, recommended operation is 25 µA to 5 mA. At 5 mA, power dissipation in SOT23-3 is ~25 mW-well below the 330 mW rating-ensuring reliable long-term operation at 85°C ambient.

Does ZRC500A03STOA support operation below –40°C?

No-ZRC500A03STOA is specified for industrial temperature range only: –40°C to +85°C. Electrical characteristics including TC, VR, and knee current are guaranteed only within this range. Operation below –40°C is outside specification and may result in increased drift or failure to regulate.

ZRC500A03STOA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 5 mA

Tolerance:: ±3%

Temperature Coefficient:: 90ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 105µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 25 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZRC500A03STOA FAQ

1.How can I place an order for ZRC500A03STOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC500A03STOA 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 ZRC500A03STOA reliable?

The price and inventory of ZRC500A03STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC500A03STOA is usually 5 days.

3.What payment methods are accepted for ZRC500A03STOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC500A03STOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC500A03STOA?

ZRC500A03STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC500A03STOA 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 ZRC500A03STOA?

For technical support, including ZRC500A03STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC500A03STOA requirements.

6.How does Aetrix verify that ZRC500A03STOA is sourced from the original manufacturer or authorized distributors?

All ZRC500A03STOA 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 ZRC500A03STOA meets industry standards.

7.What is the process for return or replacement of ZRC500A03STOA?

All ZRC500A03STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZRC500A03STOA, 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 ZRC500A03STOA part is unused and in its original packaging.

Return procedure for ZRC500A03STOA:

1.Submit a request within 90 days.

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

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