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

Diodes Incorporated ZR285R02STOB

Name: ZR285R02STOB
Brand: Diodes Incorporated
SKU: ZR285R02STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285R02STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR285R02STOB.pdf

Description:: IC VREF SHUNT 2% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:2,490

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Product details

Overview

ZR285R02STOB 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 data acquisition systems.

For engineers reviewing the ZR285R02STOB datasheet, ZR285R02STOB pinout, ZR285R02STOB application, or ZR285R02STOB equivalent, key selection criteria include low knee current (15 µA typ), slope resistance (0.4 Ω typ), wide operating current range (20 µA–20 mA), and capacitor-free stability for space-constrained low-power designs.

Technical Context

The ZR285R02STOB implements a two-terminal shunt voltage reference topology with bandgap-derived 2.5 V reverse breakdown voltage, optimized for low-quiescent-current operation without external stabilization capacitance. Its internal structure ensures stability under capacitive loads up to 10 nF and transient immunity up to 200 mA peak current.

It operates as a precision shunt regulator across a -40°C to +85°C industrial temperature range, delivering 2.45–2.55 V output at 150 µA test current, with dynamic impedance of 0.3–0.8 Ω at 100 Hz and 60 µV_rms wideband noise (10 Hz–10 kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V nominal; ±2% initial tolerance ensures accurate biasing in ADC references and sensor excitation circuits.
Temperature Coefficient	30 ppm/°C typical; enables <1 mV drift over -40°C to +85°C for stable metrology-grade measurements.
Minimum Operating Current	13 µA min; supports ultra-low-power sleep-mode operation in portable devices.
Slope Resistance	0.4 Ω typical; provides high PSRR and low output impedance for clean reference delivery into varying loads.
Dynamic Impedance	0.3 Ω at 100 Hz; minimizes AC error coupling in precision analog front-ends.
Wideband Noise	60 µV_rms (10 Hz–10 kHz); suitable for 12-bit+ data acquisition without additional filtering.
Operating Current Range	20 µA to 20 mA; accommodates both microamp-level standby and milliamp-level active measurement cycles.

Pinout & Package

Package: SOT-23 (3-lead, small-outline surface-mount). Pin 1 is floating or connected to Pin 2 per typical application; Pin 2 is cathode (output/reference node); Pin 3 is anode (ground connection).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	NC or Cathode Tie	Not internally connected; may be tied to Pin 2 to reduce parasitic inductance in high-frequency layouts.
Pin 2	Cathode	Output node providing regulated 2.5 V reference; connects to load and feedback path in shunt configuration.
Pin 3	Anode	Ground reference terminal; must be low-impedance return path for stable regulation and noise rejection.

Key Features

Feature	Design Value
No external capacitor required	Enables direct integration into compact PCB layouts without stability-compromising bypass components.
Low knee current (15 µA typ)	Allows reliable turn-on and regulation at sub-20 µA supply levels-critical for energy-harvesting and coin-cell applications.
Stable with capacitive loads	Supports direct connection to ADC input caps or op-amp feedback networks without oscillation risk.
Rugged transient handling (200 mA peak)	Withstands ESD events and power-rail transients without latch-up or parametric shift.
Fast turn-on time (few µs)	Meets burst-mode sampling requirements in portable DMMs and wireless sensor nodes.

Applications

Battery-Powered Multimeters

Precision RTD Signal Conditioning

Use Scenario: Handheld digital multimeters requiring stable reference during intermittent measurement bursts and long idle periods on coin-cell power.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing 2.5 V基准 for 16-bit sigma-delta ADC conversion.

Use Value: 13 µA minimum operating current extends battery life; ±2% tolerance and 30 ppm/°C TC ensure <0.1% full-scale accuracy across temperature.

Use Scenario: Industrial RTD bridge circuits where excitation current and ADC reference share a common precision source.

IC Role / Device Role / Timing Role: Dual-role reference: sets constant-current source compliance voltage and ADC full-scale reference.

Use Value: 0.4 Ω slope resistance minimizes reference voltage shift under varying bridge loading; capacitor-free stability simplifies layout.

Portable Gas Analyzers

Calibration Equipment for Field Instruments

Use Scenario: Battery-operated electrochemical gas sensors needing stable bias and ratiometric ADC reference in harsh ambient conditions.

IC Role / Device Role / Timing Role: Primary voltage reference for analog signal chain, including transimpedance amplifier feedback and ADC reference.

Use Value: -40°C to +85°C operation and 60 µV_rms noise support sub-ppm gas concentration resolution without thermal recalibration.

Use Scenario: Benchtop calibration standards used to verify handheld pressure, temperature, and flow meters in field service.

IC Role / Device Role / Timing Role: Precision shunt reference in programmable voltage sources generating traceable 2.5 V outputs.

Use Value: 2.45–2.55 V tolerance and low dynamic impedance enable <10 ppm output uncertainty over 1000-hour calibration intervals.

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 fixed via resistor network); 2% tolerance; 92 ppm/°C max TC; requires external resistors.	Used where programmability or higher voltage options are needed; adds component count and layout area.	Select when adjustable output or multi-voltage support is required; avoid if minimal BOM and footprint are critical.
REF3025AIDBZR	Series reference; 2.5 V fixed; 0.2% tolerance; 50 ppm/°C max TC; requires input-to-output headroom (≥100 mV).	Preferred in low-noise, high-PSRR systems where ground-referenced output is acceptable and supply margin exists.	Select for lower noise (25 µV_rms) and tighter tolerance; avoid in battery-critical or low-headroom designs.

Compared with TLVH431AIDBVR and REF3025AIDBZR, the ZR285R02STOB offers smallest footprint, zero external components, and lowest minimum operating current-making it optimal for ultra-compact, single-cell, and maintenance-free portable instrumentation.

Availability

ZR285R02STOB is available at Aetrix Electronics and suitable for battery-powered multimeters, portable gas analyzers, and precision RTD signal conditioning requiring stable component supply across extended production lifecycles.

Supply support for ZR285R02STOB 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 ZR285R02STOB operate without an external capacitor?

Yes. The ZR285R02STOB is internally compensated and stable without any external capacitor, even under capacitive loads up to 10 nF. This eliminates board space and cost associated with bypass components while maintaining regulation integrity across temperature and load variations.

What is the maximum safe operating current for ZR285R02STOB?

The absolute maximum forward current is 25 mA, and reverse current is 30 mA per datasheet. For continuous operation, Diodes recommends staying within 20 µA to 20 mA. Transient currents up to 200 mA are survivable due to rugged 20 V process design, but sustained operation above 20 mA risks thermal derating beyond 330 mW package limit.

How does ZR285R02STOB compare to bandgap references with higher initial tolerance?

ZR285R02STOB's ±2% initial tolerance is tighter than many 3% or 5% bandgap references, enabling direct use in 12-bit systems without trimming. Its 30 ppm/°C TC and 0.4 Ω slope resistance further reduce system-level calibration burden compared to looser-tolerance alternatives that require software or hardware compensation.

Is ZR285R02STOB suitable for automotive applications?

No. ZR285R02STOB is rated for -40°C to +85°C industrial temperature range and is not AEC-Q200 qualified. It lacks automotive-specific reliability testing, qualification documentation, and guaranteed PPAP support-making it unsuitable for under-hood or safety-critical vehicle subsystems.

ZR285R02STOB 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:: ±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:: Through Hole

Supplier Device Package:: TO-92

ZR285R02STOB FAQ

1.How can I place an order for ZR285R02STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285R02STOB 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 ZR285R02STOB reliable?

The price and inventory of ZR285R02STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R02STOB is usually 5 days.

3.What payment methods are accepted for ZR285R02STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R02STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285R02STOB?

ZR285R02STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285R02STOB 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 ZR285R02STOB?

For technical support, including ZR285R02STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R02STOB requirements.

6.How does Aetrix verify that ZR285R02STOB is sourced from the original manufacturer or authorized distributors?

All ZR285R02STOB 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 ZR285R02STOB meets industry standards.

7.What is the process for return or replacement of ZR285R02STOB?

All ZR285R02STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R02STOB, 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 ZR285R02STOB part is unused and in its original packaging.

Return procedure for ZR285R02STOB:

1.Submit a request within 90 days.

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

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