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

Diodes Incorporated ZRC400A02

Name: ZRC400A02
Brand: Diodes Incorporated
SKU: ZRC400A02
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC400A02

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZRC400A02.pdf

Description:: IC VREF SHUNT 2% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:3,462

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Product details

Overview

ZRC400A02 from Diodes Incorporated is a precision micropower 4.096 V bandgap voltage reference in E-Line (TO-92) package, 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 capacitor, and achieves stable output in <10 µs-ideal for battery-powered instrumentation and portable metering systems.

For engineers reviewing the ZRC400A02 datasheet, ZRC400A02 pinout, ZRC400A02 application, or ZRC400A02 equivalent, key selection criteria include knee current (18 µA typ), load stability without capacitance, transient response under 10 µs, TC performance across –40°C to +85°C, and compatibility with low-power analog signal chains in portable test equipment.

Technical Context

The ZRC400A02 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 core delivers stable regulation without external compensation, supporting capacitive loads up to 1 µF while maintaining stability.

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 robust transient immunity-withstanding surge currents up to 200 mA due to 20 V process ruggedness and internal current limiting.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	4.096 V nominal; ±2% initial accuracy ensures ADC/DAC biasing within 82 mV error at room temperature.
Temperature Coefficient	30 ppm/°C typical; drift ≤ ±1.2 mV over –40°C to +85°C enables stable 12-bit measurement accuracy.
Minimum Operating Current	18 µA typical; allows operation from ultra-low-power sources such as coin-cell leakage current or microcontroller GPIO pull-ups.
Slope Resistance	0.4 Ω typical; maintains <0.5 mV output shift per 1 mA load change-critical for high-resolution ratiometric sensor interfaces.
Transient Response	Stable in <10 µs; supports fast-switching power domains and burst-mode data acquisition without reference settling delay.
Capacitive Load Stability	Stable with ≥0 pF load; eliminates need for output capacitor-reducing BOM count and PCB area in space-constrained designs.

Pinout & Package

E-Line (TO-92) 3-pin package with pin 3 floating or connected to pin 1 per datasheet revision; standard TO-92 mechanical outline, axial leaded, through-hole mountable.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink input	Connected to system ground or low-impedance return path; sets reference node potential.
Cathode (Pin 2)	Output reference node	Provides regulated 4.096 V relative to anode; connects to ADC REF+, op-amp feedback, or sensor excitation.
Pin 3	No-connect or tied to Pin 1	Internally unconnected; may be bonded to anode for mechanical reinforcement-no electrical function.

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference design in ultra-compact layouts-eliminates capacitor footprint, aging, and ESR-related drift.
Low knee current (18 µA typ)	Permits use in energy-harvesting nodes and wake-on-event circuits where supply current falls below 20 µA during sleep.
Stable with capacitive loads	Supports direct connection to ADC input capacitors or long traces without oscillation-removes need for isolation resistors.
Rugged 200 mA surge rating	Withstands ESD events and inductive kickback without latch-up or parametric shift-enhances field reliability in industrial environments.

Applications

Battery-Powered Multimeters

Portable Gas Detectors

Use Scenario: Handheld digital multimeter operating from 9 V alkaline battery with auto-ranging ADC and LCD display.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096 V reference for 16-bit sigma-delta ADC, enabling ±0.1% DC voltage measurement accuracy.

Use Value: Low 18 µA knee current extends battery life beyond 200 hours; no capacitor reduces component count and improves long-term calibration stability.

Use Scenario: Wearable toxic gas sensor using electrochemical cell with low-power microcontroller and analog front-end.

IC Role / Device Role / Timing Role: Precision bias source for transimpedance amplifier converting nanoamp-level sensor current into measurable voltage.

Use Value: 30 ppm/°C TC ensures <±0.5 mV drift over operating range (–20°C to +50°C), preserving ppb-level gas concentration resolution.

Smart Electricity Meters

Industrial Data Loggers

Use Scenario: DIN-rail mounted kWh meter with isolated RS-485 interface, real-time clock, and metrology-grade ADC.

IC Role / Device Role / Timing Role: Primary reference for polyphase energy measurement IC (e.g., ADE7878), referenced against shunt-based current sensing.

Use Value: 0.4 Ω slope resistance minimizes gain error variation across 10–500 mA load current range-critical for Class 0.5 meter certification.

Use Scenario: Ruggedized environmental logger deployed in remote locations, powered by solar-charged LiFePO₄ battery.

IC Role / Device Role / Timing Role: Stable reference for thermistor, RTD, and humidity sensor signal conditioning in multi-channel analog input stage.

Use Value: <10 µs transient response ensures accurate sampling during rapid ambient temperature shifts-prevents reference-induced step errors in logged data.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDBZR	2.495 V nominal, adjustable via resistor divider; higher 0.22 Ω typical slope resistance; requires external bias network.	Used where programmable reference or higher output current (>100 mA) is needed; less suitable for fixed 4.096 V ratiometric systems.	Select when flexibility in reference voltage or higher sink current is prioritized over fixed-voltage simplicity and ultra-low knee current.
REF43 4.096	4.096 V fixed, 10 ppm/°C max TC, 1.5 Ω typical slope resistance; requires 1 µF output capacitor for stability.	Preferred in high-precision lab equipment where TC and long-term drift dominate over board space and capacitor count.	Choose when TC specification is tighter than 30 ppm/°C and system layout accommodates mandatory output capacitance.

Compared with TL431ACDBZR and REF43 4.096, the ZRC400A02 uniquely balances fixed 4.096 V accuracy, sub-20 µA knee current, capacitor-free operation, and TO-92 through-hole compatibility-making it optimal for cost-sensitive, space-constrained, battery-operated measurement hardware.

Availability

ZRC400A02 is available at Aetrix Electronics and suitable for battery-powered multimeters, portable gas detectors, smart electricity meters, and industrial data loggers requiring stable component supply with consistent parametric performance across temperature and current ranges.

Supply support for ZRC400A02 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 power management, signal integrity, and protection applications.

The ZRC400 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-stability analog measurement systems where size, current efficiency, and thermal robustness are critical.

FAQ

What is the maximum capacitive load the ZRC400A02 can drive without oscillation?

The ZRC400A02 is specified as stable with any capacitive load-including zero capacitance-and does not require an external output capacitor. Datasheet testing confirms stability up to at least 1 µF, making it suitable for direct connection to ADC input capacitors, long PCB traces, or noisy environments without added components.

Can the ZRC400A02 be used in series with a current-limiting resistor for 5 V supply applications?

Yes-ZRC400A02 is a shunt reference designed for use with a series current-setting resistor. For a 5 V supply, a 430 Ω resistor delivers ~2.3 mA bias current, well within the 23 µA–5 mA recommended operating range and ensuring stable 4.096 V regulation with margin for load variations.

Does the ZRC400A02 have built-in ESD protection?

The ZRC400A02 incorporates process-level ruggedness (20 V processing) and withstands transient currents up to 200 mA, but it does not include dedicated on-chip ESD protection diodes. System-level ESD protection (e.g., TVS diode at input) is recommended for IEC 61000-4-2 Level 4 compliance in end equipment.

How does the ZRC400A02's temperature coefficient compare to the ZRC400A01 and ZRC400A03 variants?

All ZRC400 variants share identical bandgap core design and typical TC of 30 ppm/°C; only initial tolerance differs-ZRC400A01 (±1%), ZRC400A02 (±2%), ZRC400A03 (±3%). The TC distribution remains unchanged across tolerance grades, so thermal drift behavior is consistent regardless of selected accuracy grade.

ZRC400A02 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):: 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:: E-Line (TO-92 compatible)

ZRC400A02 FAQ

1.How can I place an order for ZRC400A02 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC400A02 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 ZRC400A02 reliable?

The price and inventory of ZRC400A02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC400A02 is usually 5 days.

3.What payment methods are accepted for ZRC400A02?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC400A02 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC400A02?

ZRC400A02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC400A02 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 ZRC400A02?

For technical support, including ZRC400A02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC400A02 requirements.

6.How does Aetrix verify that ZRC400A02 is sourced from the original manufacturer or authorized distributors?

All ZRC400A02 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 ZRC400A02 meets industry standards.

7.What is the process for return or replacement of ZRC400A02?

All ZRC400A02 units undergo pre-shipment inspection (PSI). If there is an issue with ZRC400A02, 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 ZRC400A02 part is unused and in its original packaging.

Return procedure for ZRC400A02:

1.Submit a request within 90 days.

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

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