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

Diodes Incorporated ZR285F02TC

Name: ZR285F02TC
Brand: Diodes Incorporated
SKU: ZR285F02TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285F02TC

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR285F02TC.pdf

Description:: IC VREF SHUNT 2% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:1,414

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Product details

Overview

ZR285F02TC from Diodes Incorporated is a precision 2.5 V micropower voltage reference IC using bandgap circuit design, with ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 20 µA to 20 mA supply current-used in battery-powered instrumentation and portable measurement systems.

For engineers reviewing the ZR285F02TC datasheet, ZR285F02TC pinout, ZR285F02TC application, or ZR285F02TC equivalent, key selection criteria include low knee current (15 µA typ), slope resistance (0.4 Ω typ), wideband noise (60 µV_rms), capacitive-load stability, and SOT23-3 package compatibility.

Technical Context

The ZR285F02TC operates as a two-terminal shunt voltage reference, requiring no external stabilization capacitor and maintaining regulation across capacitive loads up to 10 nF. Its bandgap core delivers 2.5 V output with 30 ppm/°C TC and 0.4 Ω dynamic impedance.

It functions within 20 µA–20 mA operating current range, achieves stable output in microseconds after power-on, and withstands transient currents up to 200 mA due to rugged 20 V process design-enabling robust use in low-power analog signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±2% at 150 µA; ensures accurate ADC/DAC biasing in precision analog circuits
Temp Coefficient	30 ppm/°C typical; maintains <±0.5 mV drift over –40°C to +85°C industrial range
Slope Resistance	0.4 Ω typical; minimizes load-induced output variation under dynamic current changes
Min Operating Current	13 µA min; enables ultra-low-power operation in energy-harvesting or coin-cell applications
Wideband Noise	60 µV_rms (10 Hz–10 kHz); supports high-resolution data acquisition without added filtering
Capacitive Load Stability	Stable with ≥0 pF to 10 nF; eliminates need for external compensation in compact PCB layouts

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.64 × 1.12 mm body, 0.95 mm lead pitch. Pin 1 is floating or tied to Pin 2 per typical application.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink input	Accepts input current; may be left floating or shorted to cathode for specific bias configurations
Cathode (Pin 2)	Reference output node	Provides regulated 2.5 V output; connects to load and feedback networks
NC / Test (Pin 3)	No-connect terminal	Internally unused; must remain unconnected per datasheet guidance

Key Features

Feature	Design Value
No external capacitor required	Enables space-constrained designs without stability-compromising layout compromises
Low knee current (15 µA typ)	Allows reliable start-up and regulation even below 20 µA, critical for wake-up circuits
Microsecond-level settling	Reaches stable 2.5 V output in <5 µs-supports fast-sampling ADC sequences
Rugged 200 mA surge tolerance	Survives ESD transients and inrush events without derating or protection circuitry

Applications

Portable Multimeter Front-End

Battery-Powered Data Logger

Use Scenario: High-impedance voltage measurement in handheld multimeters with auto-ranging and dual-slope ADC.

IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for 16-bit ADC conversion and calibration offset correction.

Use Value: 30 ppm/°C TC and 60 µV_rms noise ensure <0.01% measurement accuracy across temperature and battery discharge cycles.

Use Scenario: Long-duration environmental monitoring using coin-cell or Li-SOCl₂ batteries with periodic sensor sampling.

IC Role / Device Role / Timing Role: Low-current voltage reference enabling <25 µA system sleep current while maintaining ADC reference integrity.

Use Value: 13 µA minimum operating current and no external capacitor reduce BOM count and extend battery life beyond 5 years.

Precision Power Supply Monitor

Industrial Panel Meter Reference

Use Scenario: Real-time rail voltage supervision in programmable logic controller (PLC) I/O modules.

IC Role / Device Role / Timing Role: Stable reference for comparator-based overvoltage/undervoltage detection with hysteresis control.

Use Value: 0.4 Ω slope resistance prevents false triggering during load-step transients on 24 V DC supply rails.

Use Scenario: Analog front-end of DIN-rail mounted panel meters measuring AC/DC current and voltage.

IC Role / Device Role / Timing Role: Primary reference for 12-bit SAR ADC and digital calibration engine across –25°C to +70°C ambient.

Use Value: ±2% initial tolerance and industrial temp range support factory calibration traceability without field recalibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBZR	Adjustable (2.5 V set via resistors), 2% tolerance, 92 ppm/°C max TC, higher 100 µA min current	Requires two external resistors; less suitable for space-constrained fixed-reference use	Choose when adjustable output or tighter production binning is needed
REF3025AIDBZR	Series reference, 2.5 V fixed, 0.2% tolerance, 50 ppm/°C max TC, 50 µA min current, requires bypass cap	Higher accuracy but consumes more quiescent current and needs external capacitor	Prefer for metrology-grade accuracy where board area and power allow

Compared with TLVH431AIDBZR and REF3025AIDBZR, the ZR285F02TC offers lowest system-level component count (no resistors/capacitor), smallest footprint (SOT23-3), and lowest operating current-making it optimal for cost-sensitive, space-limited, battery-operated instrumentation.

Availability

ZR285F02TC is available at Aetrix Electronics and suitable for portable test equipment, battery-powered data loggers, industrial panel meters, and precision power supply monitors requiring stable component supply and long-term lifecycle continuity.

Supply support for ZR285F02TC 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.

The ZR285 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, space-constrained analog measurement and calibration applications where simplicity, stability, and minimal external components are critical.

FAQ

What is the maximum capacitive load the ZR285F02TC can drive while remaining stable?

The ZR285F02TC is specified as stable with capacitive loads ranging from 0 pF up to at least 10 nF without requiring an external series resistor or compensation capacitor. This capability is verified in the datasheet's Typical Characteristics section and enables direct connection to ADC reference inputs and sample-and-hold capacitors in compact layouts.

Can Pin 1 be left unconnected, or must it be tied to Pin 2?

Per the datasheet Pin Assignment diagram and Typical Application Circuit, Pin 1 (Anode) may be left floating or connected to Pin 2 (Cathode) depending on the desired bias configuration. No external current path is required through Pin 1, and leaving it unconnected is a valid and commonly used implementation for fixed-voltage reference operation.

Does the ZR285F02TC require a minimum load current to maintain regulation?

Yes-the ZR285F02TC requires a minimum cathode current of 13 µA (typical 20 µA) to maintain regulation. Below this threshold, output voltage deviates from 2.5 V. This is inherent to shunt reference operation and must be ensured by either load current or an external bias resistor tied to a higher voltage rail.

How does the ZR285F02TC perform under transient overcurrent conditions?

The ZR285F02TC features a rugged 20 V process that allows it to withstand transient currents up to 200 mA without damage or parameter shift. This is validated in Absolute Maximum Ratings and supports robustness against ESD events, hot-plug surges, and inrush transients in industrial environments.

ZR285F02TC 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):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 20 mA

Tolerance:: ±2%

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:: Surface Mount

Supplier Device Package:: SOT-23-3

ZR285F02TC FAQ

1.How can I place an order for ZR285F02TC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285F02TC 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 ZR285F02TC reliable?

The price and inventory of ZR285F02TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285F02TC is usually 5 days.

3.What payment methods are accepted for ZR285F02TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285F02TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285F02TC?

ZR285F02TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285F02TC 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 ZR285F02TC?

For technical support, including ZR285F02TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285F02TC requirements.

6.How does Aetrix verify that ZR285F02TC is sourced from the original manufacturer or authorized distributors?

All ZR285F02TC 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 ZR285F02TC meets industry standards.

7.What is the process for return or replacement of ZR285F02TC?

All ZR285F02TC units undergo pre-shipment inspection (PSI). If there is an issue with ZR285F02TC, 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 ZR285F02TC part is unused and in its original packaging.

Return procedure for ZR285F02TC:

1.Submit a request within 90 days.

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

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