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

Diodes Incorporated ZR285R03STOA

Name: ZR285R03STOA
Brand: Diodes Incorporated
SKU: ZR285R03STOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285R03STOA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR285R03STOA.pdf

Description:: IC VREF SHUNT 3% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:2,322

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Product details

Overview

ZR285R03STOA from Diodes Incorporated is a precision 2.5 V micropower voltage reference IC using bandgap circuit design, rated for ±3% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 13 µA to 20 mA supply current - deployed in battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZR285R03STOA datasheet, ZR285R03STOA pinout, ZR285R03STOA application, or ZR285R03STOA equivalent, key selection criteria include low knee current (15 µA typ), no external capacitor requirement, slope resistance (0.4 Ω typ), wide operating current range, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZR285R03STOA implements a two-terminal shunt voltage reference topology with internal bandgap core, delivering regulated 2.5 V output across 13 µA–20 mA load current while maintaining stability without external compensation. Its dynamic impedance is 0.3 Ω at 100 Hz and 60 µV_rms wideband noise (10 Hz–10 kHz) supports high-resolution analog signal chains.

Designed for industrial temperature range (−40°C to +85°C), it achieves 30 ppm/°C typical TC via curvature-compensated bandgap architecture and exhibits robust transient immunity - surviving up to 200 mA surge current due to 20 V process ruggedness and integrated overcurrent protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±3% (tight initial accuracy enables direct ADC reference without trimming)
Temperature Coefficient	30 ppm/°C typical (low drift ensures <±0.75 mV error over −40°C to +85°C)
Minimum Operating Current	13 µA (enables ultra-low-power wake-up circuits and energy-harvesting nodes)
Slope Resistance	0.4 Ω typical (minimizes load-induced voltage shift under varying current draw)
Dynamic Impedance	0.3 Ω at 100 Hz (supports fast settling and low-noise feedback in precision regulators)
Wideband Noise	60 µV_rms, 10 Hz–10 kHz (suitable for 16-bit+ data converters without additional filtering)
Package	SOT23-3 (3.0 mm × 2.8 mm footprint; compatible with standard pick-and-place and reflow processes)

Pinout & Package

SOT23-3 surface-mount package with gull-wing leads, 1.9 mm pitch, and 0.95 mm lead-to-lead spacing. Pin 1 is anode (input), Pin 2 is cathode (output/reference), Pin 3 is NC (no connection) or floating per datasheet recommendation.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Current input terminal; connects to unregulated supply rail or current source
Pin 2	Cathode	Reference output node; provides stable 2.5 V when biased above breakdown
Pin 3	No Connection	Internally unconnected; may be left floating or tied to Pin 2 per layout best practice

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference implementation in space-limited designs like handheld meters
Low knee current (15 µA typ)	Allows reliable start-up and regulation even with microamp-level bias sources
Stable with capacitive loads	Supports direct connection to ADC reference inputs or op-amp feedback networks without oscillation
Rugged 200 mA surge rating	Withstands ESD transients and inrush events in industrial sensor interfaces
Fast turn-on time (µs range)	Reaches regulation within microseconds - critical for duty-cycled power management

Applications

Portable Multimeter Reference

Battery-Powered Data Logger

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

IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 2.5 V reference for 16-bit sigma-delta ADC conversion.

Use Value: ±3% tolerance and 30 ppm/°C TC ensure <0.1% full-scale error across operating temperature without calibration.

Use Scenario: Long-life environmental monitoring node powered by coin cell, logging temperature/humidity every 10 seconds.

IC Role / Device Role / Timing Role: Micropower reference supplying precise bias to sensor front-end amplifiers and ADC reference input.

Use Value: 13 µA minimum operating current extends battery life beyond 5 years at 10 s sampling interval.

Precision Power Supply Monitor

Industrial Process Controller Input Stage

Use Scenario: Monitoring 24 V DC supply rails in PLC I/O modules with 0.1% threshold detection.

IC Role / Device Role / Timing Role: Shunt reference generating accurate trip point for comparator-based overvoltage/undervoltage detection.

Use Value: 0.4 Ω slope resistance minimizes reference voltage shift during comparator switching transients.

Use Scenario: Analog input conditioning for 4–20 mA loop receivers in hazardous-area field transmitters.

IC Role / Device Role / Timing Role: Stable reference for current-to-voltage conversion and ADC scaling in isolated analog front ends.

Use Value: 60 µV_rms noise floor preserves SNR in 14-bit acquisition of low-level sensor signals.

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 set via resistors); 2% initial tolerance; 92 ppm/°C max TC	Requires external resistor network; higher TC limits high-temp accuracy	Choose when adjustable reference or tighter production tolerance is needed
LM4040C25IDBZR	Fixed 2.5 V; ±0.5% tolerance; 100 ppm/°C max TC; 65 µV_rms noise	Higher accuracy but higher knee current (60 µA min); less suitable for sub-50 µA systems	Choose when absolute initial accuracy > stability at ultra-low current

Compared with TLVH431AIDBVR and LM4040C25IDBZR, ZR285R03STOA offers superior micropower operation (13 µA min) and lower TC (30 ppm/°C typ), making it optimal for battery lifetime-critical, fixed-voltage, industrial-temperature applications where simplicity and ruggedness outweigh adjustability or sub-1% tolerance needs.

Availability

ZR285R03STOA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process controllers requiring stable component supply with long-term lifecycle support.

Supply support for ZR285R03STOA 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 applications demanding stable 2.5 V references without external compensation.

FAQ

Can ZR285R03STOA operate without an external capacitor?

Yes. The ZR285R03STOA is internally compensated and remains stable without any external capacitor - a key advantage over many shunt references that require 1–10 nF bypassing. This simplifies layout and reduces BOM count in compact designs like handheld test equipment.

What is the maximum safe operating current for continuous use?

The ZR285R03STOA is rated for continuous operation up to 20 mA per datasheet specifications. While it can withstand 200 mA surges briefly, sustained current above 20 mA exceeds its 330 mW power dissipation limit at 25°C ambient and risks thermal overstress in SOT23-3 packaging.

How does pin 3 function in the SOT23-3 package?

Pin 3 is internally unconnected (NC). Diodes Incorporated's datasheet explicitly states it may be left floating or tied to pin 2 (cathode) - no electrical function is assigned. It is not a trim or temperature-sensing terminal, and grounding or biasing it provides no benefit.

Is ZR285R03STOA suitable for automotive applications?

No. The ZR285R03STOA is specified for industrial temperature range (−40°C to +85°C) and lacks AEC-Q200 qualification, extended temperature grading (−40°C to +125°C), or automotive-specific reliability testing. It is intended for industrial, portable, and general-purpose instrumentation - not automotive ECUs or infotainment systems.

ZR285R03STOA 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:: 20 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

ZR285R03STOA FAQ

1.How can I place an order for ZR285R03STOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285R03STOA 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 ZR285R03STOA reliable?

The price and inventory of ZR285R03STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R03STOA is usually 5 days.

3.What payment methods are accepted for ZR285R03STOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R03STOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285R03STOA?

ZR285R03STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285R03STOA 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 ZR285R03STOA?

For technical support, including ZR285R03STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R03STOA requirements.

6.How does Aetrix verify that ZR285R03STOA is sourced from the original manufacturer or authorized distributors?

All ZR285R03STOA 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 ZR285R03STOA meets industry standards.

7.What is the process for return or replacement of ZR285R03STOA?

All ZR285R03STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R03STOA, 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 ZR285R03STOA part is unused and in its original packaging.

Return procedure for ZR285R03STOA:

1.Submit a request within 90 days.

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

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