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

Diodes Incorporated ZRC250A03STOB

Name: ZRC250A03STOB
Brand: Diodes Incorporated
SKU: ZRC250A03STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRC250A03STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZRC250A03STOB.pdf

Description:: IC VREF SHUNT 3% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:4,830

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Product details

Overview

ZRC250A03STOB from Diodes Incorporated is a precision 2.5 V bandgap voltage reference IC with ±3% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 20 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 test equipment.

For engineers reviewing the ZRC250A03STOB datasheet, ZRC250A03STOB pinout, ZRC250A03STOB application, or ZRC250A03STOB equivalent, key selection criteria include knee current (15 µA typ), capacitive load stability, transient response time, TC performance across –40°C to +85°C, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZRC250A03STOB implements a two-terminal shunt reference topology using a bandgap-derived core, delivering fixed 2.5 V reverse breakdown voltage without series pass elements. Its design eliminates need for external bypass capacitance while maintaining stability under capacitive loads up to 1 µF.

It exhibits low dynamic impedance (0.3–0.8 Ω at 100 Hz), wideband noise of 60 µV_rms (10 Hz–10 kHz), and robust transient immunity-recovering to regulation within 10 µs after single-pulse disturbance, with absolute max forward/reverse current rated at 25 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V ±3% at 150 µA; tight tolerance enables direct use in 10-bit ADC references without trimming
Temp Coefficient	30 ppm/°C typical; ensures ≤±1.25 mV drift over –40°C to +85°C ambient
Knee Current	15 µA typical; allows operation down to ultra-low power modes in sleep-state monitoring circuits
Slope Resistance	0.4 Ω typical; minimizes load-induced voltage shift under varying current draw
Transient Response	Stable in <10 µs; supports fast-switching power sequencing and wake-up event detection
Noise (10 Hz–10 kHz)	60 µV_rms; suitable for high-resolution analog front-ends in portable DMMs and sensor signal chains
Operating Current Range	20 µA to 5 mA; covers standby sensing through active measurement without external current limiting

Pinout & Package

Package: SOT23-3 (suffix F), lead-free, RoHS-compliant surface-mount package with thermal pad omitted; footprint compatible with JEDEC MO-178AB.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink input	Accepts regulated current from external resistor; connects to higher potential node in shunt configuration
Cathode (Pin 2)	Reference output	Provides stable 2.5 V relative to Anode; must be tied to system ground or common return path
No Connect (Pin 3)	Unused terminal	Internally floating per datasheet; must remain unconnected on PCB to avoid parasitic coupling

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference solution in size-critical designs like wearable biosensors
Low knee current (15 µA typ)	Supports continuous monitoring during microcontroller deep-sleep states without wake-up latency
Capacitive load stability	Remains stable with up to 1 µF ceramic output capacitance-eliminates need for ferrite beads or RC filters
Fast transient recovery (<10 µs)	Meets timing requirements for burst-mode data acquisition in handheld oscilloscopes and logic analyzers
Industrial temp range (–40°C to +85°C)	Validated for deployment in field-deployed test gear operating outdoors or in unconditioned enclosures

Applications

Battery-Powered Multimeters

Portable Gas Detectors

Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 3½-digit ADC conversion during intermittent measurements.

IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing ratiometric excitation for precision resistive divider networks.

Use Value: 30 ppm/°C TC and 60 µV_rms noise ensure <±0.02% full-scale accuracy across environmental temperature swings.

Use Scenario: Low-power electrochemical gas sensor module operating from coin-cell battery with 10-year shelf life.

IC Role / Device Role / Timing Role: Reference source for transimpedance amplifier biasing and analog front-end gain calibration.

Use Value: 15 µA knee current enables continuous sensor biasing during 99.9% duty-cycle sleep, extending battery life beyond 5 years.

Wireless Sensor Node ADC Reference

Industrial Data Logger Power Monitor

Use Scenario: Sub-GHz IoT node measuring thermistor and strain gauge signals before RF transmission.

IC Role / Device Role / Timing Role: Precision voltage reference for SAR ADC sampling synchronized to MCU wake-up timer.

Use Value: <10 µs settling time aligns with 100 kSPS sampling windows, eliminating blanking delays in burst acquisition.

Use Scenario: DIN-rail mounted energy monitor logging AC line voltage/current via isolated sigma-delta converters.

IC Role / Device Role / Timing Role: Stable reference for dual-channel 24-bit delta-sigma modulator front-end.

Use Value: 0.4 Ω slope resistance prevents gain error drift when supply rails vary ±10% under brownout conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBVR	Adjustable (2.5 V min), 2% tol, 92 ppm/°C TC, 0.2 Ω RS, requires external resistor network	Used where programmability or tighter initial tolerance is needed; adds component count and layout area	Select when system-level calibration or multi-voltage support justifies added complexity
LM4040C25IDBZR	Fixed 2.5 V, ±0.5% tol, 100 ppm/°C TC, 0.5 Ω RS, requires 1 µF capacitor for stability	Preferred in high-accuracy industrial sensors where tighter tolerance outweighs capacitor footprint cost	Choose when absolute accuracy > stability under capacitive loading is the primary constraint

Compared with TLVH431AIDBVR and LM4040C25IDBZR, the ZRC250A03STOB offers the lowest knee current and capacitor-free operation-making it optimal for ultra-low-power, space-constrained shunt reference roles where simplicity and sleep-mode efficiency are critical.

Availability

ZRC250A03STOB is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and wireless sensor nodes requiring stable component supply with guaranteed long-term availability.

Supply support for ZRC250A03STOB 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 China, Taiwan, and the U.S.

The ZRC250 series belongs to Diodes' precision analog voltage reference product line, engineered specifically for low-power, high-stability shunt reference applications in portable and industrial measurement systems.

FAQ

What is the maximum capacitive load the ZRC250A03STOB can drive without oscillation?

The ZRC250A03STOB is stable with capacitive loads up to 1 µF, as verified in the datasheet's Typical Characteristics section (Figure "Slope Resistance v Frequency"). No series resistor or isolation ferrite bead is required-unlike many competing shunt references that mandate external compensation for loads >100 nF.

Can ZRC250A03STOB operate below its specified 20 µA minimum current?

Yes-its typical knee current is 15 µA, and it maintains regulation down to ~13 µA (per Electrical Characteristics table). Below this, output voltage drops nonlinearly; however, 15 µA is sufficient for ultra-low-power microcontroller VREF inputs and comparator hysteresis biasing in sleep mode.

Is the SOT23-3 package of ZRC250A03STOB pin-compatible with standard shunt reference footprints?

Yes-the SOT23-3 (suffix F) uses standard JEDEC MO-178AB pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC. This matches industry-standard shunt reference layouts used for TL431, LM4040, and AP431 families, enabling drop-in replacement in existing designs with no PCB revision.

Does ZRC250A03STOB require derating at elevated ambient temperatures?

Yes-power dissipation must be derated above +25°C ambient. For SOT23-3, the thermal resistance is 375°C/W; at 85°C ambient, max allowable power drops to ~180 mW. At 5 mA load and 2.5 V output, power is only 12.5 mW-well within safe margin even at full temperature range.

ZRC250A03STOB 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):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 5 mA

Tolerance:: ±3%

Temperature Coefficient:: 90ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 60µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 20 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZRC250A03STOB FAQ

1.How can I place an order for ZRC250A03STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRC250A03STOB 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 ZRC250A03STOB reliable?

The price and inventory of ZRC250A03STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC250A03STOB is usually 5 days.

3.What payment methods are accepted for ZRC250A03STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC250A03STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRC250A03STOB?

ZRC250A03STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRC250A03STOB 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 ZRC250A03STOB?

For technical support, including ZRC250A03STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC250A03STOB requirements.

6.How does Aetrix verify that ZRC250A03STOB is sourced from the original manufacturer or authorized distributors?

All ZRC250A03STOB 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 ZRC250A03STOB meets industry standards.

7.What is the process for return or replacement of ZRC250A03STOB?

All ZRC250A03STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZRC250A03STOB, 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 ZRC250A03STOB part is unused and in its original packaging.

Return procedure for ZRC250A03STOB:

1.Submit a request within 90 days.

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

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