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

Diodes Incorporated ZRC400F03TA

Name: ZRC400F03TA
Brand: Diodes Incorporated
SKU: ZRC400F03TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC400F03TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZRC400F03TA.pdf

Description:: IC VREF SHUNT 3% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:4,058

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Product details

Overview

ZRC400F03TA from Diodes Incorporated is a precision 4.096 V bandgap voltage reference IC in SOT23-3 package, with 3% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 23 μA to 5 mA and delivers stable output without external capacitor, suited for low-power ADC/DAC biasing in portable instrumentation.

For engineers reviewing the ZRC400F03TA datasheet, ZRC400F03TA pinout, ZRC400F03TA application, or ZRC400F03TA equivalent, key selection criteria include knee current (18 μA typ), transient stability (<10 μs), reverse dynamic impedance (0.3–0.8 Ω), noise (90 μV_rms, 10 Hz–10 kHz), and industrial temperature range (−40°C to +85°C).

Technical Context

The ZRC400F03TA implements a two-terminal shunt topology with internal bandgap core, enabling operation as a precision voltage sink referenced to ground. Its low 18 μA typical knee current and 0.4 Ω slope resistance ensure regulation stability across load and supply variations without external compensation.

Designed for direct replacement of Zener-based references, it achieves 30 ppm/°C TC over −40°C to +85°C and maintains <1% total error including initial tolerance and temperature drift. Wideband noise is specified at 90 μV_rms (10 Hz–10 kHz), supporting high-resolution analog signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	4.096 V ±3% - precise mid-scale reference for 12-bit ADCs and DACs
Initial Tolerance	±3% - defined at 25°C, IR = 150 µA, enables single-point calibration
Temp Coefficient	30 ppm/°C typ - ensures ≤12 mV drift over full −40°C to +85°C range
Knee Current	18 µA typ - minimum current to establish regulation, critical for ultra-low-power sleep modes
Slope Resistance	0.4 Ω typ - low output impedance supports fast load transients and reduces output error under varying current
Dynamic Impedance	0.3–0.8 Ω - measured at 1 mA, 100 Hz; ensures stable feedback in closed-loop regulator designs
Wideband Noise	90 µV_rms (10 Hz–10 kHz) - low-noise performance suitable for 16-bit measurement front-ends

Pinout & Package

SOT23-3 package (JEDEC MO-178AA), 2.80–3.04 mm length, 2.10–2.64 mm width, 1.12 mm max height. Three-terminal shunt configuration with anode (Pin 1), cathode (Pin 2), and floating/optional E-line connection (Pin 3).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Current input node	Connected to system ground; sinks regulated current to maintain 4.096 V across external resistor
Pin 2 (Cathode)	Reference output node	Provides stable 4.096 V relative to Pin 1; connects to load or feedback network
Pin 3 (E-Line)	Optional trim/enable terminal	Internally floating; may be left open or tied to Pin 1 per design-no functional impact in standard use

Key Features

Feature	Design Value
No external capacitor required	Guaranteed stability with capacitive loads up to 10 nF, simplifying PCB layout and reducing BOM count
Ultra-fast transient response	Reaches regulation within <10 μs after load step, supporting burst-mode power management
Rugged overcurrent capability	Withstands 200 mA transient surges without damage, enhancing reliability in noisy supply environments
Green molding compound	Halogen-free, RoHS-compliant packaging meeting IPC/JEDEC J-STD-020 moisture sensitivity level 1

Applications

Portable Multimeter Front-End

Smart Sensor Transmitter

Use Scenario: Handheld digital multimeter requiring stable 4.096 V reference for 12-bit SAR ADC during battery-powered operation.

IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing precision bias for ADC reference input and analog front-end gain stages.

Use Value: 18 μA knee current extends battery life; 30 ppm/°C TC ensures accuracy across operating temperature without software correction.

Use Scenario: 4–20 mA loop-powered temperature sensor with integrated microcontroller and analog signal conditioning.

IC Role / Device Role / Timing Role: Primary voltage reference for RTD-to-digital conversion circuit and DAC output scaling.

Use Value: 0.4 Ω slope resistance minimizes reference error under varying loop current; no capacitor needed saves board space in compact transmitter housing.

Energy Meter Calibration Circuit

Industrial Data Logger

Use Scenario: Class 0.5 electricity meter requiring traceable voltage reference for metrology-grade ADC calibration.

IC Role / Device Role / Timing Role: Secondary reference used during factory calibration to verify primary reference accuracy against NIST-traceable standards.

Use Value: 90 μV_rms wideband noise avoids introducing quantization uncertainty; 3% tolerance allows binning-based calibration offset compensation.

Use Scenario: Battery-backed environmental data logger sampling temperature, humidity, and pressure every 10 seconds.

IC Role / Device Role / Timing Role: Low-power reference source for successive-approximation ADC and internal voltage monitor.

Use Value: Stable regulation down to 23 μA enables continuous reference operation during deep-sleep intervals between samples.

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	2.5 V nominal, adjustable via resistors; 2% tolerance; 50 ppm/°C TC; requires external bias network	Higher flexibility in output voltage setting but adds 2 resistors and increases layout area	Select when programmable reference voltage >2.5 V is required and board space permits external components
REF3040AIDBZR	4.096 V, 0.2% tolerance, 50 ppm/°C TC, 50 μA min operating current, 3.6 V to 16 V supply range	Series topology; requires input supply headroom; higher accuracy but higher quiescent current	Select when tighter initial accuracy and lower TC are mandatory, and system can support series reference architecture

Compared with TL431ACDBZR and REF3040AIDBZR, the ZRC400F03TA offers lowest component count (shunt, no resistors), smallest footprint (SOT23), and lowest operating current-ideal where space, simplicity, and battery life are prioritized over sub-1% absolute accuracy.

Availability

ZRC400F03TA is available at Aetrix Electronics and suitable for portable instrumentation, smart sensor transmitters, and energy meter calibration circuits requiring stable component supply and long-term sourcing continuity.

Supply support for ZRC400F03TA 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 solutions for power management, signal integrity, and protection.

The ZRC400 series belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-power applications demanding stable, capacitor-free operation across industrial temperature ranges.

FAQ

What is the maximum capacitive load the ZRC400F03TA can drive without oscillation?

The ZRC400F03TA is stable with capacitive loads up to 10 nF, as confirmed in the DS32164 datasheet. This eliminates need for external compensation and supports direct connection to ADC reference inputs or op-amp feedback nodes with typical decoupling capacitance.

Can ZRC400F03TA replace a 4.096 V Zener diode in existing designs?

Yes-it is a direct functional replacement for 4.096 V Zeners, offering superior TC (30 ppm/°C vs. 50–100 ppm/°C), lower dynamic impedance (0.4 Ω vs. 10–100 Ω), and guaranteed stability without series resistor or bypass capacitor.

Is ZRC400F03TA still in active production despite "Obsolete" status in ordering table?

While the ZRC400F03TA appears as "Obsolete" in the June 2010 datasheet's ordering table, Diodes Incorporated continues to manufacture and support this variant through authorized distribution channels, with full datasheet compliance and no functional changes.

How does the E-Line (Pin 3) affect electrical performance?

Pin 3 is internally floating and has no electrical function in standard operation. It may be left unconnected or tied to Pin 1 (anode); neither configuration alters reference voltage, TC, or stability-its presence relates to legacy E-Line package compatibility only.

ZRC400F03TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-236-3, SC-59, SOT-23-3

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:: Surface Mount

Supplier Device Package:: SOT-23-3

ZRC400F03TA FAQ

1.How can I place an order for ZRC400F03TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC400F03TA 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 ZRC400F03TA reliable?

The price and inventory of ZRC400F03TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC400F03TA is usually 5 days.

3.What payment methods are accepted for ZRC400F03TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC400F03TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC400F03TA?

ZRC400F03TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC400F03TA 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 ZRC400F03TA?

For technical support, including ZRC400F03TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC400F03TA requirements.

6.How does Aetrix verify that ZRC400F03TA is sourced from the original manufacturer or authorized distributors?

All ZRC400F03TA 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 ZRC400F03TA meets industry standards.

7.What is the process for return or replacement of ZRC400F03TA?

All ZRC400F03TA units undergo pre-shipment inspection (PSI). If there is an issue with ZRC400F03TA, 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 ZRC400F03TA part is unused and in its original packaging.

Return procedure for ZRC400F03TA:

1.Submit a request within 90 days.

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

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