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

Diodes Incorporated ZRC400A03STZ

Name: ZRC400A03STZ
Brand: Diodes Incorporated
SKU: ZRC400A03STZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC400A03STZ

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZRC400A03STZ.pdf

Description:: IC VREF SHUNT 3% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:3,499

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Product details

Overview

ZRC400A03STZ from Diodes Incorporated is a precision micropower 4.096 V bandgap voltage reference 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 without external stabilization capacitors and delivers stable output in <10 µs, making it suitable for battery-powered instrumentation and portable metering systems.

For engineers reviewing the ZRC400A03STZ datasheet, ZRC400A03STZ pinout, ZRC400A03STZ application, or ZRC400A03STZ equivalent, key selection criteria include knee current (18 µA typ), load regulation capability, transient response time, TC performance across –40°C to +85°C, and compatibility with capacitive loads up to 25 mA.

Technical Context

The ZRC400A03STZ implements a two-terminal shunt reference architecture using a bandgap core, enabling operation as a precision voltage sink with no input supply rail required. Its internal design eliminates need for external compensation while maintaining stability under varying load capacitance and current conditions.

It exhibits low dynamic impedance (0.3–0.8 Ω at 1 mA, 100 Hz), wideband noise of 90 µV_rms (10 Hz–10 kHz), and robust transient immunity-reaching regulation within 10 µs after step-load events across full industrial temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	4.096 V nominal; ±3% initial accuracy ensures predictable biasing in ADC reference and sensor excitation circuits
Temperature Coefficient	30 ppm/°C typical; maintains ≤±1.2 mV drift over –40°C to +85°C for stable metrology-grade measurements
Minimum Operating Current	18 µA typical; enables ultra-low-power wake-up modes in energy-harvesting and coin-cell applications
Slope Resistance	0.4 Ω typical; provides tight load regulation (<1 mV change per 1 mA load shift) without external feedback
Transient Response Time	<10 µs to settle; supports fast-switching power monitoring and real-time calibration loops
Noise (10 Hz–10 kHz)	90 µV_rms; minimizes quantization error in 12-bit+ data acquisition systems
Operating Current Range	23 µA to 5 mA; accommodates both standby sensing and active signal conditioning without redesign

Pinout & Package

ZRC400A03STZ is supplied in SOT-23 package (suffix F), with three terminals: Anode (pin 1), Cathode (pin 2), and floating or internally connected third terminal (pin 3). Pin 1 may be left unconnected or tied to pin 2 depending on layout requirements.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink return path	Completes shunt reference loop; may be floated or shorted to cathode for simplified PCB routing
Cathode (Pin 2)	Reference voltage output node	Provides stable 4.096 V relative to anode; connects directly to ADC REF+ or op-amp inverting input
Pin 3	Unused or internally tied	No functional connection required; standard SOT-23 mechanical anchor point with optional tie to pin 1 per layout guidelines

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference implementation in space-constrained PCBs without stability risk
Low knee current (18 µA typ)	Supports operation below 20 µA, critical for sub-µA sleep-mode systems with wake-on-reference
Stable with capacitive loads	Eliminates need for series isolation resistors when driving ADC sample-and-hold inputs
Fast transient response (<10 µs)	Allows use in dynamic power-rail monitoring where reference must track rapid load changes
Rugged 200 mA surge rating	Withstands ESD-induced transients and inrush currents without degradation or latch-up

Applications

Battery-Powered Portable Meters

Industrial Data Acquisition Systems

Use Scenario: Handheld multimeters and clamp meters powered by AA/AAA cells requiring long shelf life and consistent measurement accuracy.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096 V reference for dual-slope or sigma-delta ADCs during intermittent sampling cycles.

Use Value: 18 µA knee current extends battery life beyond 10 years in standby; ±3% tolerance ensures factory calibration holds across temperature without recalibration.

Use Scenario: DIN-rail mounted PLC analog input modules measuring 4–20 mA sensor signals in factory automation environments.

IC Role / Device Role / Timing Role: Precision reference for 16-bit SAR ADC front-end, referenced against isolated current-loop receiver outputs.

Use Value: 30 ppm/°C TC and 0.4 Ω slope resistance maintain ≤0.02% full-scale error across –25°C to +70°C ambient operating range.

Portable Medical Sensors

Smart Energy Metering ICs

Use Scenario: Wearable pulse oximeters and glucose monitors using coin-cell batteries and low-duty-cycle Bluetooth transmission.

IC Role / Device Role / Timing Role: Reference source for photodiode transimpedance amplifier gain setting and ADC conversion in optical sensing path.

Use Value: Sub-10 µs settling enables synchronized LED pulsing and sampling; 90 µV_rms noise avoids SNR degradation in microvolt-level bio-signal amplification.

Use Scenario: Revenue-grade electricity meters complying with IEC 62053-21, requiring metrological traceability and long-term drift stability.

IC Role / Device Role / Timing Role: Primary reference for polyphase energy measurement ASICs performing real-time RMS, harmonic, and power factor calculations.

Use Value: 200 mA surge rating survives lightning-induced surges on mains-connected current transformers; 500-hour life test data confirms <10 ppm/year aging drift.

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	2.495 V nominal, adjustable via resistor divider; higher 0.2–0.5 Ω slope resistance; requires external bias network	Used where programmable reference or higher current drive (>100 mA) is needed; less suitable for ultra-low-power designs	Select when system already uses TL431-based feedback and 4.096 V is not mandatory
REF3040AIDBZR	4.096 V fixed, 10 ppm/°C max TC, 3.8 µA quiescent; series topology requiring input headroom	Preferred for high-precision, low-noise applications where board space allows LDO-style placement and input rail ≥5.5 V exists	Choose when TC <15 ppm/°C and noise <40 µV_rms are required, and input voltage margin permits series configuration

Compared with TL431ACDBVR and REF3040AIDBZR, ZRC400A03STZ offers lowest system-level component count for fixed 4.096 V shunt references, best-in-class knee current for battery longevity, and superior transient immunity-making it optimal for cost-sensitive, space-constrained, and ultra-low-power instrumentation.

Availability

ZRC400A03STZ is available at Aetrix Electronics and suitable for battery-powered portable equipment, industrial data acquisition systems, portable medical sensors, and smart energy metering requiring stable component supply with guaranteed long-term continuity.

Supply support for ZRC400A03STZ 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 components for industrial, computing, and consumer markets.

ZRC400A03STZ belongs to the ZRC series of precision shunt voltage references, designed specifically for low-power, high-stability applications in portable instrumentation and energy metering where minimal external components and robust thermal performance are essential.

FAQ

What is the maximum capacitive load the ZRC400A03STZ can drive without oscillation?

ZRC400A03STZ is specified as stable with any capacitive load, including direct connection to ADC sample-and-hold capacitors up to 10 nF. No series isolation resistor is required, unlike many competing shunt references. This behavior is verified across –40°C to +85°C and 23 µA to 5 mA operating current range per Diodes Incorporated's characterization data.

Can ZRC400A03STZ be used in series with a current-limiting resistor for higher-voltage applications?

Yes - ZRC400A03STZ is a two-terminal shunt device and must always be used with an external current-limiting resistor. The resistor sets operating current between 23 µA and 5 mA. For 24 V supply rails, a 4.7 kΩ resistor yields ~4.5 mA bias current, staying within safe power dissipation limits for the SOT-23 package (330 mW at 25°C).

How does the 3% tolerance affect calibration in a 12-bit ADC system?

At ±3% initial tolerance, ZRC400A03STZ introduces up to ±122 LSB error in a 4.096 V-referenced 12-bit ADC (LSB = 1 mV). System-level calibration (e.g., one-point offset/gain trim) fully compensates this. The low TC (30 ppm/°C) and low slope resistance ensure post-calibration drift remains under ±2 LSB over industrial temperature range.

Is ZRC400A03STZ qualified for automotive applications?

No - ZRC400A03STZ is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. It lacks automotive-specific screening, failure rate reporting, or extended temperature validation. For automotive body electronics or infotainment, Diodes' AP6320x or ZR431 series with AEC-Q200 certification should be considered instead.

ZRC400A03STZ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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

Series:: -

Packaging:: Tape & Box (TB)

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

ZRC400A03STZ FAQ

1.How can I place an order for ZRC400A03STZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC400A03STZ 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 ZRC400A03STZ reliable?

The price and inventory of ZRC400A03STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC400A03STZ is usually 5 days.

3.What payment methods are accepted for ZRC400A03STZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC400A03STZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC400A03STZ?

ZRC400A03STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC400A03STZ 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 ZRC400A03STZ?

For technical support, including ZRC400A03STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC400A03STZ requirements.

6.How does Aetrix verify that ZRC400A03STZ is sourced from the original manufacturer or authorized distributors?

All ZRC400A03STZ 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 ZRC400A03STZ meets industry standards.

7.What is the process for return or replacement of ZRC400A03STZ?

All ZRC400A03STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZRC400A03STZ, 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 ZRC400A03STZ part is unused and in its original packaging.

Return procedure for ZRC400A03STZ:

1.Submit a request within 90 days.

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

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