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

Diodes Incorporated ZR285F03TA

Name: ZR285F03TA
Brand: Diodes Incorporated
SKU: ZR285F03TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285F03TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR285F03TA.pdf

Description:: IC VREF SHUNT 3% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:3,699

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Product details

Overview

ZR285F03TA from Diodes Incorporated is a precision 2.5 V micropower voltage reference IC using bandgap circuit design, with ±3% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 13 µA to 20 mA - deployed in battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZR285F03TA datasheet, ZR285F03TA pinout, ZR285F03TA application, or ZR285F03TA equivalent, key selection criteria include knee current (15 µA typ), slope resistance (0.4 Ω typ), capacitive load stability without external capacitor, and SOT23-3 package compatibility for space-constrained PCB layouts.

Technical Context

The ZR285F03TA operates as a two-terminal shunt voltage reference, sinking current to maintain 2.5 V across its terminals. Its bandgap core delivers low drift over −40°C to +85°C, with TC specified at 30 ppm/°C (typ) and 90 ppm/°C (max).

No external stabilization capacitor is required due to inherent phase margin design; it remains stable with capacitive loads up to 10 µF and achieves regulation within <5 µs after power-on, supporting fast-settling analog front-ends and low-power wake-up circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±3% (initial tolerance at 150 µA; ensures accuracy-critical biasing in ADC references)
Tempco (TC)	30 ppm/°C typ (low drift enables stable 12-bit+ measurement over industrial temp range)
Min Operating Current	13 µA (enables ultra-low-power sleep-mode reference hold in battery-backed systems)
Slope Resistance	0.4 Ω typ (low dynamic impedance maintains regulation under varying load current steps)
Wideband Noise	60 µV_rms (10 Hz–10 kHz; suitable for precision 16-bit SAR ADC reference without added filtering)
Capacitive Load Stability	Stable with ≥0 pF (eliminates need for external capacitor, reducing BOM count and board area)
Settling Time	<5 µs (supports rapid power cycling in portable test equipment with intermittent sampling)

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.10 × 1.12 mm body height, gull-wing leads, tape-and-reel (3000 pcs/reel).

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink input	Connected to higher potential node; current flows into device to regulate cathode voltage
Cathode (Pin 2)	Reference output	2.5 V regulated node; connects to load or ADC reference input
NC / Floating (Pin 3)	No-connect terminal	Internally unconnected; may be left floating or tied to cathode per layout best practice

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference solution in high-density portable PCBs without stability risk
15 µA typical knee current	Allows reliable regulation down to sub-20 µA supply currents - critical for coin-cell lifetime extension
0.4 Ω typical slope resistance	Minimizes output voltage shift under load transients (e.g., during ADC conversion bursts)
−40°C to +85°C operating range	Validated performance across full industrial temperature envelope without derating
30 ppm/°C tempco	Supports ≤0.01% full-scale error drift in 85°C ambient environments

Applications

Battery-Powered Multimeters

Precision Data Loggers

Use Scenario: Handheld digital multimeter operating from 9 V alkaline battery with auto-ranging ADC.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for 16-bit sigma-delta ADC.

Use Value: ±3% initial tolerance and 30 ppm/°C TC ensure <0.05% measurement error across battery discharge and ambient temperature swings.

Use Scenario: Low-power environmental sensor node logging temperature/humidity every 10 seconds.

IC Role / Device Role / Timing Role: Reference source for rail-to-rail op-amp signal conditioning and ADC reference.

Use Value: 13 µA minimum operating current extends CR2032 battery life beyond 2 years in periodic-sampling mode.

Portable Oscilloscope Front-End

Calibration Equipment Reference

Use Scenario: 50 MHz handheld oscilloscope with 8-bit ADC and variable gain amplifier chain.

IC Role / Device Role / Timing Role: Stable DC reference for offset calibration of differential input amplifiers.

Use Value: <5 µs settling time enables fast recalibration between vertical scale changes without measurement interruption.

Use Scenario: Benchtop calibrator verifying 4–20 mA loop transmitters and process sensors.

IC Role / Device Role / Timing Role: Primary voltage standard traceable to internal 2.5 V reference hierarchy.

Use Value: 60 µV_rms noise floor supports ≤10 ppm RMS uncertainty in 24-hour calibration stability tests.

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 programmable), 2% initial tol, 92 ppm/°C max TC, 0.2 Ω RS	Requires two external resistors; higher TC limits use in wide-temp industrial field instruments	Preferred when adjustable reference or tighter slope resistance is needed, but adds BOM and layout complexity
LM4040CIM3-2.5	Fixed 2.5 V, ±0.5% tol, 100 ppm/°C max TC, 0.5 Ω RS, 65 µV_rms noise	Higher initial accuracy but worse TC and noise; requires 60 µA min current	Chosen for higher-accuracy lab-grade instruments where 0.5% tolerance outweighs battery-life penalty

Compared with TLVH431AIDBVR and LM4040CIM3-2.5, ZR285F03TA offers the lowest minimum operating current (13 µA) and best TC (30 ppm/°C typ) among SOT23-3 shunt references - making it optimal for long-life, temperature-stable portable measurement where BOM simplicity matters.

Availability

ZR285F03TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and precision data acquisition systems requiring stable component supply despite its obsolete status per Diodes' ordering table.

Supply support for ZR285F03TA 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 and manufacturing operations across Asia and the US.

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 components.

FAQ

Is ZR285F03TA pin-compatible with other SOT23-3 shunt references like TL431 or LM4040?

No - ZR285F03TA is a two-terminal shunt reference (Anode/Cathode/NC), while TL431 is a three-terminal adjustable shunt regulator and LM4040 is a two-terminal device with different pinout (Cathode/Anode/NC reversed). Physical pin alignment differs: ZR285 uses Anode–Cathode–NC (left-to-right), whereas LM4040 uses Cathode–Anode–NC. PCB layout must be verified per datasheet top view.

Can ZR285F03TA drive a 10 µF bypass capacitor directly at its cathode?

Yes - the ZR285F03TA is explicitly designed for unconditional stability with capacitive loads up to at least 10 µF, as confirmed in the datasheet's "Capacitive Load Stability" section and typical characteristics plots. No series resistor or isolation is required, simplifying layout for noise-sensitive ADC references.

What is the maximum safe continuous current for ZR285F03TA in SOT23-3 package at 70°C ambient?

At T_AMB = 70°C, derated power dissipation is ~220 mW (based on 330 mW @ 25°C and θ_JA ≈ 200°C/W). With V_R = 2.5 V, max continuous current is ~88 mA. However, electrical specs are only guaranteed up to 20 mA; operation above that risks increased TC error and long-term drift - 20 mA remains the recommended upper limit for specification compliance.

Does ZR285F03TA support reverse-voltage protection on its anode terminal?

No - ZR285F03TA is not rated for reverse voltage. Absolute maximum rating specifies only forward current (25 mA) and reverse current (30 mA), but reverse breakdown is not characterized. Applying reverse polarity risks permanent damage. External series diode or polarity protection circuitry is required in systems with potential supply reversal.

ZR285F03TA 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:: ±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:: Surface Mount

Supplier Device Package:: SOT-23-3

ZR285F03TA FAQ

1.How can I place an order for ZR285F03TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285F03TA 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 ZR285F03TA reliable?

The price and inventory of ZR285F03TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285F03TA is usually 5 days.

3.What payment methods are accepted for ZR285F03TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285F03TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285F03TA?

ZR285F03TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285F03TA 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 ZR285F03TA?

For technical support, including ZR285F03TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285F03TA requirements.

6.How does Aetrix verify that ZR285F03TA is sourced from the original manufacturer or authorized distributors?

All ZR285F03TA 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 ZR285F03TA meets industry standards.

7.What is the process for return or replacement of ZR285F03TA?

All ZR285F03TA units undergo pre-shipment inspection (PSI). If there is an issue with ZR285F03TA, 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 ZR285F03TA part is unused and in its original packaging.

Return procedure for ZR285F03TA:

1.Submit a request within 90 days.

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

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