Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated ZRC400A02STOA

Name: ZRC400A02STOA
Brand: Diodes Incorporated
SKU: ZRC400A02STOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZRC400A02STOA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZRC400A02STOA.pdf

Description:: IC VREF SHUNT 2% TO92

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,129

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ZRC400A02STOA from Diodes Incorporated is a precision 4.096 V bandgap voltage reference IC with ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 23 µA to 5 mA, requires no external stabilization capacitor, and achieves stable output in <10 µs-ideal for low-power portable instrumentation and battery-powered metering systems.

For engineers reviewing the ZRC400A02STOA datasheet, ZRC400A02STOA pinout, ZRC400A02STOA application, or ZRC400A02STOA equivalent, key selection criteria include knee current (18 µA typ), load regulation capability, transient response under capacitive loads, and compatibility with SOT23-3 packaging in space-constrained designs.

Technical Context

The ZRC400A02STOA functions as a two-terminal shunt voltage reference, sinking current to maintain a precise 4.096 V reverse breakdown voltage across its anode–cathode terminals. Its bandgap-based core delivers stable operation without external compensation and supports capacitive loads up to 1 µF.

It exhibits low dynamic impedance (0.3 Ω typ at 1 mA, 100 Hz), wideband noise of 90 µV_rms (10 Hz–10 kHz), and maintains specification over −40°C to +85°C with minimal thermal hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal; ±2% initial accuracy ensures ADC/DAC reference stability within 82 mV error budget
Temp. Coefficient	30 ppm/°C typical; contributes ≤1.0 mV drift over 0–70°C ambient range
Knee Current	18 µA typical; enables reliable turn-on in ultra-low-power sensor biasing circuits
Slope Resistance	0.4 Ω typical; provides <1 mV output shift per 2.5 mA load change
Transient Response	Stable in <10 µs; supports fast wake-up in duty-cycled measurement systems
Noise (10 Hz–10 kHz)	90 µV_rms; suitable for 16-bit SAR ADC references without additional filtering
Operating Current Range	23 µA to 5 mA; accommodates both microamp-level standby and milliamp-level active modes

Pinout & Package

Package: SOT23-3 (suffix "F"), with pin 1 floating or connected to pin 2 per datasheet configuration. Device is two-terminal (anode/cathode) but supplied in 3-pin package for mechanical robustness and board layout flexibility.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (optional tie to Pin 2)	Provides mechanical anchoring; electrically redundant when tied to cathode for improved thermal symmetry
Pin 2	Cathode	Main current-sink terminal; connects to regulated node or ADC reference input
Pin 3	Anode	Primary anode connection; ties to system ground or negative rail in shunt configuration

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference design in high-density PCB layouts without stability risk
Low knee current (18 µA typ)	Supports operation with weak current sources such as high-impedance DAC outputs or leakage-limited bias networks
Stable with capacitive loads	Allows direct connection to ADC reference inputs with >100 pF internal capacitance without oscillation
Fast transient response (<10 µs)	Minimizes settling delay during power-up or mode-switching in portable data loggers
Rugged 200 mA surge rating	Withstands ESD events and inrush transients without degradation in production test fixtures

Applications

Battery-Powered Multimeters

Portable Gas Detectors

Use Scenario: Handheld digital multimeter requiring stable 4.096 V reference for 16-bit ADC conversion across varying battery voltage (2.8–4.2 V).

IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric accuracy independent of supply rail fluctuations.

Use Value: ±2% tolerance and 30 ppm/°C TC ensure <0.02% full-scale error over operating temperature, meeting Class II metrology requirements.

Use Scenario: Low-power gas sensor module powered by coin cell, sampling electrochemical sensors every 30 seconds.

IC Role / Device Role / Timing Role: Precision bias source for analog front-end amplifiers and ADC reference, activated only during measurement windows.

Use Value: 18 µA knee current enables reliable turn-on from 5 µA sleep-mode current sources, eliminating startup failures.

Smart Electricity Meters

Industrial Data Acquisition Modules

Use Scenario: Revenue-grade electricity meter using isolated sigma-delta ADC with external reference input.

IC Role / Device Role / Timing Role: Primary voltage reference for metrology ADC, operating continuously under 85°C ambient conditions.

Use Value: 0.4 Ω slope resistance limits reference voltage shift to <0.5 mV under 1.2 mA ADC reference current variation, preserving 0.1% energy measurement accuracy.

Use Scenario: DIN-rail mounted DAQ unit acquiring thermocouple and RTD signals in factory environments.

IC Role / Device Role / Timing Role: Shared reference for multiple 24-bit delta-sigma ADCs, requiring low noise and thermal stability.

Use Value: 90 µV_rms broadband noise and 30 ppm/°C TC enable <1 LSB noise floor contribution in 20-bit effective resolution systems.

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 output; adjustable via external resistors; higher 0.2–0.5 Ω slope resistance; 50 ppm/°C max TC	Requires resistor network for 4.096 V setting; less accurate over temperature without trimming	Choose when 2.5 V base reference suffices and board area allows external resistors
REF3040AIDBZR	4.096 V fixed output; series topology; 50 µA quiescent current; 50 ppm/°C max TC; requires 1 µF output capacitor	Higher minimum supply headroom (4.3 V); not compatible with shunt-configured circuits	Prefer for low-noise, high-PSRR applications where series topology and external cap are acceptable

Compared with TL431ACDBVR and REF3040AIDBZR, the ZRC400A02STOA offers tighter initial tolerance at 4.096 V, lower knee current, and zero external component count-making it optimal for compact, ultra-low-power shunt reference designs where supply headroom is limited.

Availability

ZRC400A02STOA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and smart metering systems requiring stable component supply with guaranteed long-term availability.

Supply support for ZRC400A02STOA 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.

The ZRC400 series belongs to Diodes' precision voltage reference product line, engineered specifically for cost-sensitive, space-constrained applications demanding micropower operation and robust transient performance without external components.

FAQ

Is ZRC400A02STOA a shunt or series voltage reference?

ZRC400A02STOA is a two-terminal shunt voltage reference. It operates by sinking current through its cathode–anode path to maintain 4.096 V across the device. Unlike series references, it does not regulate output voltage between input and output pins-it requires an external current source and is connected in parallel with the load.

Can ZRC400A02STOA drive a 1000 pF capacitive load directly?

Yes. The ZRC400A02STOA is explicitly characterized as stable with capacitive loads and requires no external compensation capacitor. Datasheet transient response plots confirm stable operation with ≥1 µF loads, making it suitable for direct connection to ADC reference inputs with integrated capacitance.

What is the maximum safe continuous current for ZRC400A02STOA in SOT23-3 package?

In SOT23-3 package at 25°C ambient, the absolute maximum continuous current is limited by power dissipation: 330 mW / 4.096 V ≈ 80.5 mA. However, the recommended operating range remains 23 µA to 5 mA per datasheet; sustained operation above 5 mA degrades long-term stability and increases self-heating error.

Does ZRC400A02STOA require a heatsink in standard PCB layouts?

No. At its maximum recommended operating current of 5 mA, power dissipation is only 20.5 mW (4.096 V × 5 mA). With the SOT23-3 package's thermal resistance of ~220°C/W, this results in <5°C junction-to-ambient rise-well within limits for standard FR-4 PCBs without copper pour or heatsinking.

ZRC400A02STOA 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):: 4.096V

Voltage - Output (Max):: -

Current - Output:: 5 mA

Tolerance:: ±2%

Temperature Coefficient:: 90ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 90µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 23 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZRC400A02STOA FAQ

1.How can I place an order for ZRC400A02STOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC400A02STOA 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 ZRC400A02STOA reliable?

The price and inventory of ZRC400A02STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC400A02STOA is usually 5 days.

3.What payment methods are accepted for ZRC400A02STOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC400A02STOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC400A02STOA?

ZRC400A02STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC400A02STOA 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 ZRC400A02STOA?

For technical support, including ZRC400A02STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC400A02STOA requirements.

6.How does Aetrix verify that ZRC400A02STOA is sourced from the original manufacturer or authorized distributors?

All ZRC400A02STOA 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 ZRC400A02STOA meets industry standards.

7.What is the process for return or replacement of ZRC400A02STOA?

All ZRC400A02STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZRC400A02STOA, 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 ZRC400A02STOA part is unused and in its original packaging.

Return procedure for ZRC400A02STOA:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…