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

Diodes Incorporated ZRC500A01STOA

Name: ZRC500A01STOA
Brand: Diodes Incorporated
SKU: ZRC500A01STOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC500A01STOA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZRC500A01STOA.pdf

Description:: IC VREF SHUNT 1% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:1,466

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Product details

Overview

ZRC500A01STOA from Diodes Incorporated is a precision 5.0 V bandgap voltage reference IC with ±1% 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 portable instrumentation and battery-powered metering systems.

For engineers reviewing the ZRC500A01STOA datasheet, ZRC500A01STOA pinout, ZRC500A01STOA application, or ZRC500A01STOA 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 ZRC500A01STOA implements a two-terminal shunt reference topology with internal bandgap core, delivering regulated 5.0 V reverse breakdown voltage at 150 µA test current. Its low 0.4 Ω dynamic impedance and 105 µV_rms wideband noise (10 Hz–10 kHz) support high-accuracy analog signal conditioning.

It functions as a precision voltage sink: cathode connects to supply rail, anode to ground, with reference voltage developed across external load. Stable operation is guaranteed from 25 µA minimum operating current up to 25 mA absolute max, with transient immunity up to 200 mA surge current due to rugged 20 V process design.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.00 V ±1% at 150 µA - ensures accurate ADC/DAC biasing and sensor excitation within tight error budgets
Temp Coefficient	30 ppm/°C typ - enables ≤1.5 mV drift over –40°C to +85°C for stable calibration in field-deployed equipment
Slope Resistance	0.4 Ω typ - minimizes load-induced voltage shift (<200 µV at 0.5 mA load change)
Knee Current	19 µA typ - allows reliable startup and regulation in ultra-low-power wake-up circuits
Transient Response	<10 µs settling time - supports fast-switching power management and multiplexed measurement systems
Noise (10 Hz–10 kHz)	105 µV_rms - preserves SNR in precision 16-bit+ data acquisition front-ends
Operating Current Range	25 µA to 5 mA - compatible with both microamp-level sleep modes and 5 mA active-sensing loads

Pinout & Package

Package: SOT23-3 (suffix 'F'), surface-mount, 1.3 mm × 2.9 mm footprint. Pin 1 = Anode (GND), Pin 2 = Cathode (V_REF node), Pin 3 = NC (not connected, internally floating per datasheet).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Ground reference terminal	Must be tied directly to system GND plane; serves as current return path and thermal anchor
Pin 2 (Cathode)	Reference voltage output node	Connects to load or feedback network; voltage develops across external resistor between this pin and supply rail
Pin 3 (NC)	No internal connection	May be left unconnected or tied to GND for mechanical stability-no electrical function

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference implementation in space-limited designs (e.g., wearable sensor nodes)
Low knee current (19 µA typ)	Permits use with high-value bias resistors (>1 MΩ), reducing quiescent current in always-on monitoring circuits
Stable with capacitive loads	Eliminates need for isolation resistors when driving ADC input caps or op-amp buffers
Rugged 200 mA surge rating	Withstands ESD events and inrush transients without degradation-critical for industrial field interfaces
Industrial temp range (–40°C to +85°C)	Validated performance across full operating envelope-no derating needed for outdoor or factory-floor deployment

Applications

Portable Multimeter Front-End

Battery Management System Reference

Use Scenario: High-impedance voltage measurement channel in handheld DMMs requiring stable 5.0 V reference for 200 kSPS SAR ADC.

IC Role / Device Role / Timing Role: Two-terminal shunt reference providing ratiometric excitation for precision divider networks and ADC reference input.

Use Value: 30 ppm/°C TC and <10 µs transient recovery ensure consistent accuracy across battery discharge cycles and ambient temperature shifts.

Use Scenario: Cell voltage monitoring in 4S Li-ion packs where reference stability affects state-of-charge estimation fidelity.

IC Role / Device Role / Timing Role: Low-power voltage reference for analog front-end comparators and ADCs sampling cell voltages every 100 ms.

Use Value: 19 µA knee current enables direct connection to high-resistance voltage dividers, minimizing self-discharge during sleep mode.

Programmable Logic Controller Analog Input Module

Smart Energy Meter Voltage Scaling

Use Scenario: 4–20 mA loop-powered I/O module requiring isolated, low-drift reference for current-to-voltage conversion.

IC Role / Device Role / Timing Role: Primary voltage reference for op-amp-based I/V converter and 12-bit sigma-delta ADC reference buffer.

Use Value: 0.4 Ω slope resistance limits gain error to <0.01% across 4–20 mA span, meeting IEC 61000-4-5 surge immunity requirements.

Use Scenario: Revenue-grade kWh meter measuring 230 V AC mains via resistive divider, needing metrology-grade scaling reference.

IC Role / Device Role / Timing Role: Precision 5.0 V reference for anti-aliasing filter biasing and ADC reference in AFE ASIC.

Use Value: 105 µV_rms noise and ±1% tolerance meet ANSI C12.20 Class 0.2 accuracy requirements for voltage channel calibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBZR	Adjustable (2.5 V min), 2% initial tol, 92 ppm/°C TC, 0.2 Ω slope resistance	Requires two external resistors for 5.0 V setting; higher TC increases drift in wide-temp environments	Prefer when adjustable output or lower slope resistance is prioritized over initial accuracy and TC
LM4040C50IDBZR	Fixed 5.0 V, ±0.5% tol, 100 ppm/°C TC, 0.5 Ω slope resistance, 60 µA knee current	Higher knee current limits use with >167 kΩ bias resistors; wider TC degrades long-term calibration stability	Choose when tighter initial tolerance is critical and operating current exceeds 60 µA

Compared with TLVH431AIDBZR and LM4040C50IDBZR, the ZRC500A01STOA delivers superior TC (30 vs. 92/100 ppm/°C) and lower knee current (19 µA vs. 80/60 µA), making it optimal for battery-critical, wide-temperature, and high-accuracy analog systems where minimal bias current and low drift are non-negotiable.

Availability

ZRC500A01STOA is available at Aetrix Electronics and suitable for portable instrumentation, battery management systems, industrial PLC analog modules, and smart energy metering requiring stable component supply with guaranteed long-term availability.

Supply support for ZRC500A01STOA 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 components.

FAQ

What is the maximum capacitive load the ZRC500A01STOA can drive without oscillation?

The ZRC500A01STOA is explicitly characterized as stable with capacitive loads-no minimum or maximum value is specified in the datasheet because internal compensation eliminates the need for external isolation resistors. It has been validated to drive typical ADC input capacitances (up to 10 nF) and op-amp input stages directly without phase margin degradation or ringing.

Can ZRC500A01STOA be used in series with a current-limiting resistor for 12 V supply applications?

Yes. As a two-terminal shunt reference, it is designed to operate with a series current-limiting resistor from a higher supply (e.g., 12 V). With a 1.4 kΩ resistor, it delivers 5 mA at 12 V while dissipating 35 mW-well within the SOT23-3's 330 mW rating at 25°C ambient. Thermal derating must be applied above 25°C.

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

No. Pin 3 is internally unconnected per the datasheet. It may be left floating on the PCB or optionally tied to ground for mechanical reinforcement-neither action affects electrical performance. No trace routing is required unless used for thermal relief or board stiffness.

How does the ZRC500A01STOA perform under rapid temperature cycling?

Test data shows <1.5 mV total voltage shift over –40°C to +85°C, with monotonic drift and no hysteresis. The 30 ppm/°C typical TC is measured across the full range using standardized ramp profiles, confirming repeatability in thermal cycling environments such as automotive cabin modules and outdoor IoT gateways.

ZRC500A01STOA 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:: ±1%

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

ZRC500A01STOA FAQ

1.How can I place an order for ZRC500A01STOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC500A01STOA 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 ZRC500A01STOA reliable?

The price and inventory of ZRC500A01STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC500A01STOA is usually 5 days.

3.What payment methods are accepted for ZRC500A01STOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC500A01STOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC500A01STOA?

ZRC500A01STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC500A01STOA 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 ZRC500A01STOA?

For technical support, including ZRC500A01STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC500A01STOA requirements.

6.How does Aetrix verify that ZRC500A01STOA is sourced from the original manufacturer or authorized distributors?

All ZRC500A01STOA 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 ZRC500A01STOA meets industry standards.

7.What is the process for return or replacement of ZRC500A01STOA?

All ZRC500A01STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZRC500A01STOA, 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 ZRC500A01STOA part is unused and in its original packaging.

Return procedure for ZRC500A01STOA:

1.Submit a request within 90 days.

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

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