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

Diodes Incorporated ZRC400A03STOB

Name: ZRC400A03STOB
Brand: Diodes Incorporated
SKU: ZRC400A03STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC400A03STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZRC400A03STOB.pdf

Description:: IC VREF SHUNT 3% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:4,267

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Product details

Overview

ZRC400A03STOB from Diodes Incorporated is a precision 4.096 V bandgap voltage reference with ±3% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance, designed for low-power analog signal conditioning in battery-powered instrumentation and portable test equipment.

For engineers reviewing the ZRC400A03STOB datasheet, ZRC400A03STOB pinout, ZRC400A03STOB application, or ZRC400A03STOB equivalent, key selection criteria include knee current (18 µA typ), transient stability (<10 µs), capacitor-free operation, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZRC400A03STOB operates as a two-terminal shunt reference, sinking current to maintain a stable 4.096 V reverse breakdown voltage across its anode–cathode terminals. It requires no external stabilization capacitor and remains stable with capacitive loads up to 1 µF.

Its bandgap core delivers consistent performance from 23 µA to 5 mA operating current, with rugged transient handling up to 200 mA and absolute maximum ratings of 25 mA forward/reverse current and −40°C to +85°C industrial temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	4.096 V nominal; ±3% initial tolerance ensures accurate ADC/DAC biasing without trimming.
Temp Coefficient	30 ppm/°C typical; maintains ≤±1.2 mV drift over −40°C to +85°C for stable metrology-grade references.
Knee Current	18 µA typical; enables reliable startup and regulation in ultra-low-power sensor nodes.
Slope Resistance	0.4 Ω typical; minimizes output voltage shift under load variation (e.g., ±0.2 mV at ±0.5 mA load change).
Transient Response	Stable in <10 µs; supports fast-switching power supply monitoring and dynamic calibration circuits.
Operating Current	23 µA to 5 mA; compatible with both microamp-level standby modes and milliamp-level active measurement cycles.
Noise (10 Hz–10 kHz)	90 µV_rms; suitable for high-resolution 16-bit+ data acquisition systems without added filtering.

Pinout & Package

Package: SOT23-3 (suffix 'F'), with pin 1 floating or connected to pin 2 per E-Line variant configuration. Device is two-terminal (anode/cathode) in functional operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink input	Connected to regulated output node; sinks current to establish reference voltage at cathode.
Cathode (Pin 2)	Reference voltage output	Provides stable 4.096 V relative to anode; used as precision bias point for op-amps or ADC references.
Pin 3	Not connected (NC) or tied to Pin 1	Internally unused; may be bonded to anode for mechanical robustness or left floating per layout requirements.

Key Features

Feature	Design Value
No external capacitor required	Eliminates BOM cost and board area for stabilization, simplifying layout in compact portable designs.
Low knee current (18 µA typ)	Enables reliable regulation in energy-harvesting and coin-cell-powered devices where supply current is severely limited.
Capacitive load stability	Supports direct connection to ADC input capacitors or op-amp feedback networks without oscillation risk.
Transient response <10 µs	Allows use in real-time fault detection circuits requiring rapid voltage validation after power-up or mode switching.
Rugged 200 mA surge rating	Withstands ESD events and inrush transients without degradation, reducing need for external protection components.

Applications

Battery-Powered Multimeters

Portable Gas Detectors

Use Scenario: Handheld digital multimeter measuring DC voltage with 0.1% accuracy over −10°C to +50°C ambient.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096 V for 16-bit SAR ADC reference rail.

Use Value: 30 ppm/°C TC and ±3% tolerance ensure full-scale error stays within specification without factory calibration.

Use Scenario: Low-power electrochemical gas sensor node operating on CR2032 battery for 2+ years.

IC Role / Device Role / Timing Role: Precision bias source for transimpedance amplifier converting sensor current to voltage.

Use Value: 18 µA knee current allows continuous reference operation while maintaining >5-year battery life at 20 µA average system current.

Industrial Panel Meters

Calibration Equipment

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

IC Role / Device Role / Timing Role: Reference for 12-bit DAC generating precise 4 mA zero-point current.

Use Value: 0.4 Ω slope resistance limits output error to <0.2 mV under varying loop impedance, ensuring 0.05% current accuracy.

Use Scenario: Benchtop calibrator verifying 4–20 mA transmitter outputs across temperature extremes.

IC Role / Device Role / Timing Role: Stable excitation source for precision resistor-based current shunts.

Use Value: <10 µs transient response enables sub-millisecond step-response verification during automated calibration sequences.

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 reference; adjustable via resistive divider; 50 ppm/°C max TC; requires external resistor network.	Used where programmable reference voltage or higher output current (>100 mA) is needed.	Select when flexibility in reference voltage setting outweighs fixed 4.096 V requirement and board space constraints.
REF3040AIDBVR	4.096 V fixed reference; 50 ppm/°C max TC; 50 µA min operating current; requires 1 µF bypass capacitor.	Preferred in noise-sensitive, high-precision data loggers where ultra-low drift (max 50 ppm/°C) is prioritized over startup current.	Choose when tighter long-term stability and lower noise (50 µV_rms) justify added capacitor and higher minimum current.

Compared with TL431ACDBVR and REF3040AIDBVR, the ZRC400A03STOB offers lowest knee current (18 µA vs. 50–100 µA), capacitor-free operation, and smallest footprint (SOT23-3), making it optimal for size- and power-critical portable instrumentation.

Availability

ZRC400A03STOB is available at Aetrix Electronics and suitable for battery-powered multimeters, portable gas detectors, and industrial panel meters requiring stable component supply with guaranteed long-term continuity.

Supply support for ZRC400A03STOB 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 ZRC400 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, space-constrained applications demanding stable, capacitor-free shunt references with minimal knee current.

FAQ

Is ZRC400A03STOB a two-terminal or three-terminal device?

ZRC400A03STOB is functionally a two-terminal shunt voltage reference (anode and cathode), though packaged in a 3-pin SOT23. Pin 3 is internally unconnected or bonded to Pin 1 per E-Line construction; it serves mechanical or layout purposes only and must not be used as an electrical terminal.

Can ZRC400A03STOB drive a 10 nF capacitive load directly?

Yes - the ZRC400A03STOB is explicitly characterized for stability with capacitive loads and requires no external compensation. Data sheet confirms stable operation with ≥1 µF loads; 10 nF is well within safe margin and introduces negligible phase shift or overshoot in typical applications.

What is the maximum allowable reverse voltage before breakdown?

The ZRC400A03STOB has a nominal reverse breakdown voltage of 4.096 V. Its absolute maximum reverse voltage is not specified separately, but the device is rated for 25 mA reverse current and 20 V processing - meaning sustained reverse bias beyond 4.096 V will cause increasing current flow per its I–V curve, with thermal limits governing safe operation.

Does ZRC400A03STOB require a heatsink in SO8 packages at 5 mA?

No - in SO8 package (ZRC400N803), power dissipation at 5 mA × 4.096 V = 20.5 mW, well below the 625 mW rating at 25°C ambient. Even at 85°C ambient, derated power capability exceeds 300 mW, so no heatsink is needed for standard operation within datasheet current limits.

ZRC400A03STOB 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:: ±3%

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

ZRC400A03STOB FAQ

1.How can I place an order for ZRC400A03STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC400A03STOB 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 ZRC400A03STOB reliable?

The price and inventory of ZRC400A03STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC400A03STOB is usually 5 days.

3.What payment methods are accepted for ZRC400A03STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC400A03STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC400A03STOB?

ZRC400A03STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC400A03STOB 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 ZRC400A03STOB?

For technical support, including ZRC400A03STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC400A03STOB requirements.

6.How does Aetrix verify that ZRC400A03STOB is sourced from the original manufacturer or authorized distributors?

All ZRC400A03STOB 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 ZRC400A03STOB meets industry standards.

7.What is the process for return or replacement of ZRC400A03STOB?

All ZRC400A03STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZRC400A03STOB, 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 ZRC400A03STOB part is unused and in its original packaging.

Return procedure for ZRC400A03STOB:

1.Submit a request within 90 days.

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

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