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

Diodes Incorporated ZRC500A03

Name: ZRC500A03
Brand: Diodes Incorporated
SKU: ZRC500A03
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC500A03

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZRC500A03.pdf

Description:: IC VREF SHUNT 3% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:1,814

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Product details

Overview

ZRC500A03 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, operating from 25 µA to 5 mA. It delivers stable output without external capacitors and supports capacitive loads, making it ideal for low-power instrumentation and battery-powered metering systems.

For engineers reviewing the ZRC500A03 datasheet, ZRC500A03 pinout, ZRC500A03 application, or ZRC500A03 equivalent, key selection criteria include knee current (19 µA typ), transient stability (<10 µs), industrial temperature range (–40°C to +85°C), and E-Line 3-pin through-hole package compatibility.

Technical Context

The ZRC500A03 implements a bandgap-based reference architecture that maintains regulation across 25 µA–5 mA load currents without requiring an external stabilization capacitor. Its low dynamic impedance (0.3–0.8 Ω at 1 mA, 100 Hz) and wideband noise of 105 µV_rms (10 Hz–10 kHz) support high-accuracy analog signal conditioning.

It exhibits robust transient response-reaching stable output in under 10 µs for single-pulse events-and sustains operation up to 200 mA surge current due to rugged 20 V process design, while rated absolute maximum forward/reverse current is 25 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±3% at 150 µA, enabling direct ADC reference or comparator threshold setting
Temp Coefficient	30 ppm/°C typical, ensuring ≤1.5 mV drift over –40°C to +85°C
Knee Current	19 µA typical, allowing reliable start-up in ultra-low-power sleep modes
Slope Resistance	0.4 Ω typical, minimizing load-induced voltage shift under varying current
Transient Stability	Stable in <10 µs, supporting fast-sampling data acquisition systems
Noise (10 Hz–10 kHz)	105 µV_rms, suitable for 12-bit+ precision measurement front-ends
Operating Current Range	25 µA to 5 mA, covering both standby and active measurement phases

Pinout & Package

E-Line 3-pin through-hole package (suffix R), with Pin 3 floating or connected to Pin 1 per datasheet revision. Compact footprint compatible with legacy TO-92 layouts while supporting higher power dissipation (500 mW at 25°C).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Input / Cathode connection point	Accepts input voltage ≥5.5 V; reverse-biased configuration enables Zener-like reference operation
Pin 2 (Cathode)	Reference Output	Delivers regulated 5.0 V; low-impedance node for direct connection to ADC REF or op-amp feedback
Pin 3 (NC or Anode Tie)	No-connect or Anode tie	Internally floating; may be bonded to Pin 1 to reduce thermal resistance or improve layout symmetry

Key Features

Feature	Design Value
No external capacitor required	Enables space-constrained PCB designs without stability-compromising bypass components
Low knee current (19 µA typ)	Permits operation in microcontroller deep-sleep states with minimal wake-up latency
Stable with capacitive loads	Supports direct driving of sample-and-hold capacitors or ADC input filters without oscillation
Transient response <10 µs	Meets timing requirements for multiplexed multi-channel data loggers switching references
Rugged 20 V process	Withstands ESD and line transients common in industrial fieldbus interfaces

Applications

Portable Multimeter Front-End

Battery Management System Reference

Use Scenario: High-impedance DC voltage measurement in handheld multimeters with auto-ranging.

IC Role / Device Role / Timing Role: Precision 5.0 V reference for 16-bit sigma-delta ADC and analog front-end gain calibration.

Use Value: ±3% initial tolerance and 30 ppm/°C TC ensure <±0.1% full-scale error across operating temperature.

Use Scenario: Cell voltage monitoring in 3S Li-ion packs with MCU-based protection logic.

IC Role / Device Role / Timing Role: Stable reference for ADC channel measuring individual cell voltages during charge/discharge cycles.

Use Value: 19 µA knee current allows continuous monitoring during sleep mode without compromising battery life.

Industrial Process Transmitter

Smart Energy Meter Calibration

Use Scenario: 4–20 mA loop-powered sensor transmitting temperature/pressure via HART protocol.

IC Role / Device Role / Timing Role: Reference for DAC generating loop current and for internal diagnostics ADC.

Use Value: 0.4 Ω slope resistance minimizes current-source error under varying loop load conditions.

Use Scenario: Revenue-grade kWh meter requiring metrology-grade voltage reference traceability.

IC Role / Device Role / Timing Role: Primary reference for polyphase energy measurement ASIC ADC inputs.

Use Value: 105 µV_rms noise floor supports >95 dB SNR in 10 kHz bandwidth measurements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDR	Adjustable 2.5 V reference (requires external resistors), 50 ppm/°C max TC, 0.22 Ω typical output impedance	Requires resistor network for 5 V setup; higher TC limits high-temp accuracy	Choose when adjustable output or tighter output impedance is prioritized over fixed 5 V simplicity
REF5050AIDR	5.0 V, 3 ppm/°C max TC, 10 µV_p-p noise, but requires 800 µA min current and external capacitor	Higher precision at cost of board area, power, and complexity	Choose for metrology-grade systems where 3 ppm/°C stability outweighs size and current constraints

Compared with TL431ACDR and REF5050AIDR, the ZRC500A03 offers fixed 5 V output with no external components, ultra-low knee current, and industrial temp range-all in a through-hole E-Line package-making it optimal for cost-sensitive, space-constrained, and battery-aware designs where ±3% tolerance is acceptable.

Availability

ZRC500A03 is available at Aetrix Electronics and suitable for portable instrumentation, battery management systems, industrial transmitters, and smart energy meters requiring stable component supply with long-term manufacturability.

Supply support for ZRC500A03 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and communications markets.

The ZRC500 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-stability applications in portable and industrial measurement equipment where simplicity, reliability, and small footprint are critical.

FAQ

Is ZRC500A03 stable without an external capacitor?

Yes. The ZRC500A03 uses an internally compensated bandgap design and is specified to operate stably without any external capacitor, even with capacitive loads up to 10 nF. This eliminates layout sensitivity and reduces BOM count in space-constrained designs.

What is the maximum safe operating current for continuous use?

The recommended continuous operating current is 5 mA, with absolute maximum ratings of 25 mA forward/reverse current. While transient surges up to 200 mA are survivable due to rugged processing, sustained operation above 5 mA exceeds thermal design limits and risks long-term drift or failure.

Can ZRC500A03 drive a 10 kΩ load directly?

Yes. At 5 mA load, the output voltage deviation is limited by its 0.4 Ω typical slope resistance-resulting in only ~2 mV drop. For a 10 kΩ load drawing 0.5 mA, the drop is negligible (<0.2 mV), confirming suitability for direct ADC reference or op-amp biasing without buffering.

How does the E-Line 3-pin package differ from TO-92?

The E-Line 3-pin (suffix R) uses the same outline as TO-92 but features a modified leadframe with Pin 3 electrically isolated (or optionally tied to Pin 1). This improves thermal performance and layout flexibility versus standard TO-92, while maintaining compatibility with existing through-hole assembly processes.

ZRC500A03 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: E-Line-3

Series:: -

Packaging:: Bulk

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:: E-Line (TO-92 compatible)

ZRC500A03 FAQ

1.How can I place an order for ZRC500A03 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC500A03 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 ZRC500A03 reliable?

The price and inventory of ZRC500A03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC500A03 is usually 5 days.

3.What payment methods are accepted for ZRC500A03?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC500A03 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC500A03?

ZRC500A03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC500A03 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 ZRC500A03?

For technical support, including ZRC500A03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC500A03 requirements.

6.How does Aetrix verify that ZRC500A03 is sourced from the original manufacturer or authorized distributors?

All ZRC500A03 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 ZRC500A03 meets industry standards.

7.What is the process for return or replacement of ZRC500A03?

All ZRC500A03 units undergo pre-shipment inspection (PSI). If there is an issue with ZRC500A03, 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 ZRC500A03 part is unused and in its original packaging.

Return procedure for ZRC500A03:

1.Submit a request within 90 days.

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

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