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

Diodes Incorporated ZR285N803TA

Name: ZR285N803TA
Brand: Diodes Incorporated
SKU: ZR285N803TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285N803TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ZR285N803TA.pdf

Description:: IC VREF SHUNT 3% 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:1,822

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Product details

Overview

ZR285N803TA from Zetex Semiconductors (now Diodes Incorporated) is a precision 2.5 V micropower bandgap voltage reference in SO8 package, designed for low-current biasing of ADCs, DACs, and sensor signal chains. It delivers ±3% initial tolerance, 30 ppm/°C typical temperature coefficient, 0.4 Ω typical slope resistance, and operates stably from 20 µA to 20 mA - ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZR285N803TA datasheet, ZR285N803TA pinout, ZR285N803TA application, or ZR285N803TA equivalent, key selection criteria include knee current (15 µA typ), capacitive load stability without external compensation, transient settling in microseconds, and industrial temperature range (–40°C to +85°C) performance consistency.

Technical Context

The ZR285N803TA implements a two-terminal shunt reference architecture with internal bandgap core, requiring no external capacitor for stability and supporting operation with capacitive loads up to 10 nF. Its reverse breakdown topology enables simple connection across supply rails with series resistor biasing.

It achieves thermal stability via curvature-corrected bandgap design, yielding 30 ppm/°C typical TC over –40°C to +85°C and maintaining <1.5 mV total deviation across that range at 1 mA. Slope resistance remains ≤1 Ω up to 20 mA, ensuring minimal output voltage shift under dynamic load changes.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±3% (initial accuracy at 25°C, IR = 150 µA)
Temp. Coefficient	30 ppm/°C typical (max 90 ppm/°C over –40°C to +85°C)
Slope Resistance	0.4 Ω typical (ensures <0.4 mV shift per 1 mA load change)
Min Operating Current	13 µA (guarantees regulation onset; knee current ~15 µA)
Max Operating Current	30 mA absolute max (20 mA recommended for stable regulation)
Wideband Noise	60 µV rms (10 Hz–10 kHz, IR = 150 µA)
Power Dissipation	625 mW (SO8 package at 25°C ambient)

Pinout & Package

SO8 package (suffix "N8"), 3.9 mm × 4.9 mm body, standard 1.27 mm pitch. Pin 1 is marked by notch or dot; device is two-terminal shunt configuration.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (Input)	Connected to higher potential rail; current flows into device through this terminal
Pin 2	Cathode (Output/Ref)	Provides regulated 2.5 V reference node; connected to load and feedback point
Pins 3–8	No Connect / Thermal Pad	Internally unconnected; may be left floating or tied to ground for thermal relief (not electrically required)

Key Features

Feature	Design Value
No external capacitor required	Enables compact PCB layout and eliminates capacitor aging/temperature drift dependencies
Low knee current (15 µA typ)	Supports ultra-low-power wake-up circuits and energy-harvesting systems with microampere bias budgets
Stable with capacitive loads	Allows direct buffering with op-amps or driving SAR ADC sample capacitors without oscillation risk
Fast transient response (<5 µs)	Meets timing requirements for multiplexed sensor channels and burst-mode data acquisition
Rugged 20 V process	Withstands ESD transients and line surges up to 200 mA peak without latch-up or degradation

Applications

Battery-Powered Multimeters

Portable Gas Analyzers

Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC over 0–10 V input range and varying battery voltage (6–9 V).

IC Role / Device Role / Timing Role: Two-terminal shunt reference providing ratiometric scaling reference independent of supply rail fluctuations.

Use Value: Maintains ±0.05% measurement accuracy across –20°C to +60°C ambient and 10-year shelf life due to low TC and long-term drift <20 ppm/year.

Use Scenario: Low-power electrochemical gas sensor interface in wearable air quality monitor, operating on coin-cell battery for >1 year.

IC Role / Device Role / Timing Role: Precision bias source for transimpedance amplifier and analog front-end, enabling sub-ppm gas concentration resolution.

Use Value: Enables 15 µA minimum operating current to extend battery life while delivering 60 µVrms noise floor for high-SNR signal conditioning.

Industrial RTD Signal Conditioners

Calibration Equipment Reference Modules

Use Scenario: DIN-rail mounted temperature transmitter using 3-wire Pt100 RTD, requiring stable excitation and reference for 24-bit ΣΔ ADC.

IC Role / Device Role / Timing Role: Shunt reference supplying both bridge excitation current and ADC reference voltage in single-supply 3.3 V system.

Use Value: 0.4 Ω slope resistance minimizes self-heating error during 1 mA excitation; 30 ppm/°C TC ensures <0.1°C system error over full industrial range.

Use Scenario: Benchtop calibrator generating precise 2.500 V output with programmable load capability up to 10 mA.

IC Role / Device Role / Timing Role: Primary voltage reference element in closed-loop calibration path, trimmed at factory for ±0.025% absolute accuracy.

Use Value: 625 mW SO8 power rating supports sustained 10 mA output without derating; 90 ppm/°C max TC guarantees traceability to NIST standards over calibration interval.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDR	Adjustable (2.5 V setpoint), 2% initial tol, 50 ppm/°C TC, requires external resistors	Used where programmability or tighter tolerance not required; higher noise (120 µVrms)	Lower cost option when adjustable output or BOM consolidation with existing TL431 designs is prioritized
REF3025AIDBZR	Fixed 2.5 V, 0.2% tol, 50 ppm/°C TC, 3.5 µA quiescent, but requires 1 µF output cap	Preferred in ultra-low-power IoT nodes where accuracy outweighs capacitor count	Choose when ±0.2% absolute accuracy and sub-µA sleep current are mandatory, accepting added passive component

Compared with TL431ACDR and REF3025AIDBZR, the ZR285N803TA offers superior capacitive-load stability without external components, faster turn-on for duty-cycled systems, and ruggedness for harsh environments - making it optimal for space-constrained, maintenance-free field instruments.

Availability

ZR285N803TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial sensor signal conditioning requiring stable component supply and long-lifecycle availability.

Supply support for ZR285N803TA 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

Zetex Semiconductors, acquired by Diodes Incorporated in 2008, specialized in high-performance analog and discrete semiconductors for precision, power, and interface applications.

The ZR285 series was developed for low-power, high-stability voltage referencing in portable and industrial measurement systems - emphasizing micropower operation, minimal external components, and robust thermal performance.

FAQ

What is the maximum capacitive load the ZR285N803TA can drive without oscillation?

The ZR285N803TA is specified stable with capacitive loads up to 10 nF without external compensation. This is verified in the manufacturer's typical characteristics plots and application notes. Stability holds across the full –40°C to +85°C temperature range and 20 µA–20 mA operating current. Loads exceeding 10 nF may require series isolation resistance or should be validated per specific board layout and parasitic conditions.

Can ZR285N803TA be used in series (two-terminal) configuration only, or does it support three-terminal operation?

The ZR285N803TA is strictly a two-terminal shunt reference and has no three-terminal (e.g., reference, input, ground) variant. Its SO8 package exposes only Anode (Pin 1) and Cathode (Pin 2) as functional terminals; Pins 3–8 are internally unconnected. It must be biased with an external series resistor and connected across the supply rail - no separate ground or adjust pin exists.

How does the 30 ppm/°C typical temperature coefficient translate to actual voltage drift over temperature?

At 30 ppm/°C typical, the ZR285N803TA exhibits ~0.75 mV/°C drift around 2.5 V. Over the full –40°C to +85°C range (125°C span), typical total drift is ≤94 mV (2.5 V × 30 ppm/°C × 125°C), or ~±47 mV about nominal. Measured data shows actual deviation stays within ±1.25 mV (±0.05%) across that range at 1 mA, confirming curvature compensation effectiveness.

Is the ZR285N803TA RoHS compliant and lead-free?

Yes - the ZR285N803TA, manufactured by Diodes Incorporated post-acquisition, meets RoHS Directive 2011/65/EU and is lead-free with matte tin finish on SO8 leads. The device carries the "Pb-Free" marking on packaging and conforms to JEDEC J-STD-020 moisture sensitivity level 3 (MSL3). Full compliance documentation is available under Diodes Inc. part number ZR285N803TAQ.

ZR285N803TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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:: 8-SO

ZR285N803TA FAQ

1.How can I place an order for ZR285N803TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285N803TA 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 ZR285N803TA reliable?

The price and inventory of ZR285N803TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285N803TA is usually 5 days.

3.What payment methods are accepted for ZR285N803TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285N803TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285N803TA?

ZR285N803TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285N803TA 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 ZR285N803TA?

For technical support, including ZR285N803TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285N803TA requirements.

6.How does Aetrix verify that ZR285N803TA is sourced from the original manufacturer or authorized distributors?

All ZR285N803TA 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 ZR285N803TA meets industry standards.

7.What is the process for return or replacement of ZR285N803TA?

All ZR285N803TA units undergo pre-shipment inspection (PSI). If there is an issue with ZR285N803TA, 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 ZR285N803TA part is unused and in its original packaging.

Return procedure for ZR285N803TA:

1.Submit a request within 90 days.

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

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