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

Diodes Incorporated ZR285F02TA

Name: ZR285F02TA
Brand: Diodes Incorporated
SKU: ZR285F02TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285F02TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR285F02TA.pdf

Description:: IC VREF SHUNT 2% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:3,294

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Product details

Overview

ZR285F02TA 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 ZR285F02TA datasheet, ZR285F02TA pinout, ZR285F02TA application, or ZR285F02TA equivalent, key selection criteria include low knee current (15 µA typ), slope resistance (0.4 Ω typ), wide operating current range, capacitor-free stability, and SOT23-3 package compatibility for space-constrained analog signal chains.

Technical Context

The ZR285F02TA operates as a two-terminal shunt voltage reference, sinking current to maintain a precise 2.5 V reverse breakdown voltage across its cathode-anode terminals. Its bandgap-based architecture delivers stable output without external compensation and supports capacitive loads up to 10 nF.

It achieves fast turn-on in microseconds and maintains regulation under transient load steps up to 200 mA peak, enabled by rugged 20 V process technology and low dynamic impedance (0.3–0.8 Ω at 100 Hz).

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±2% (2.45–2.55 V) at 150 µA, enabling accurate ADC/DAC biasing
Tempco (TC)	30 ppm/°C typical (max 90 ppm/°C), ensuring <±3 mV drift over –40°C to +85°C
Min Operating Current	13 µA typical, allowing ultra-low-power wake-up and standby modes
Slope Resistance	0.4 Ω typical, minimizing output voltage shift under load current variation
Dynamic Impedance	0.3–0.8 Ω at 100 Hz, supporting stable feedback in precision regulator loops
Noise (10 Hz–10 kHz)	60 µV_rms, suitable for high-resolution measurement front-ends
Package	SOT23-3, footprint-compatible with industry-standard 2.8 × 2.1 mm PCB layouts

Pinout & Package

SOT23-3 package: 3-pin surface-mount, lead-free, RoHS-compliant, with standard pin 1 identification notch. Pin 1 is floating or connected to pin 2 per typical application; pin 2 is anode (GND), pin 3 is cathode (V_REF output).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	NC or Anode tie	Not internally connected; may be tied to pin 2 for mechanical stability or thermal symmetry
Pin 2	Anode (GND)	Reference ground return path; must be low-impedance for noise immunity
Pin 3	Cathode (V_REF)	2.5 V regulated output node; sinks current from external bias resistor or load

Key Features

Feature	Design Value
No external capacitor required	Enables single-component reference implementation in compact PCBs without stability risk
Low knee current (15 µA typ)	Permits operation below 20 µA, extending battery life in always-on sensor nodes
Capacitive load stability	Remains stable with up to 10 nF output capacitance, simplifying filtering in noisy environments
Rugged 200 mA surge rating	Withstands ESD transients and inrush events without latch-up or parametric shift
Microsecond turn-on time	Reaches regulation within ~5 µs, supporting fast-sampling or duty-cycled measurement systems

Applications

Battery-Powered Multimeters

Portable Gas Detectors

Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across varying battery voltage (2.8–4.2 V).

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

Use Value: ±2% tolerance and 30 ppm/°C TC ensure <±0.5 LSB error over full temperature and battery discharge range.

Use Scenario: Low-power gas sensor module operating on coin-cell battery with intermittent 100 ms active sampling cycles.

IC Role / Device Role / Timing Role: Micropower reference enabling sub-20 µA quiescent current during sleep while delivering fast wake-up regulation.

Use Value: 15 µA knee current and microsecond turn-on allow immediate measurement accuracy after wake-up without warm-up delay.

Industrial Data Loggers

Medical Patient Monitors (Non-Life-Support)

Use Scenario: Remote environmental logger recording temperature/humidity every 5 minutes using a 3.3 V LDO and 12-bit SAR ADC.

IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference input and sensor excitation biasing.

Use Value: 60 µV_rms broadband noise and 0.4 Ω slope resistance minimize quantization uncertainty and line regulation error.

Use Scenario: Portable pulse oximeter with optical front-end requiring stable analog bias for photodiode TIA and ADC reference.

IC Role / Device Role / Timing Role: Low-noise, low-drift shunt reference powering analog signal chain in Class II medical device.

Use Value: Industrial-grade –40°C to +85°C operation and 90 ppm/°C max TC meet IEC 60601-1 ambient specification limits.

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), higher 80 µA min current, 90 ppm/°C max TC	Requires two external resistors; less suitable for fixed-voltage, ultra-low-I_Q designs	Choose when adjustable reference or higher sink current (>100 mA) is needed
MAX6008AEUR+T	Fixed 2.5 V, 15 ppm/°C max TC, 65 µA min current, SC70-3 package	Lower tempco but higher minimum current; not drop-in due to different pinout and layout	Choose when tighter drift spec justifies higher quiescent power and redesign effort

Compared with TLVH431AIDBVR and MAX6008AEUR+T, the ZR285F02TA offers the lowest knee current and simplest fixed-voltage implementation in SOT23-3, making it optimal for space- and power-constrained shunt reference use cases where ±2% initial accuracy suffices.

Availability

ZR285F02TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial data acquisition systems requiring stable component supply and long-term manufacturability.

Supply support for ZR285F02TA 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, designed specifically for low-power, space-sensitive analog systems requiring stable, capacitor-free 2.5 V references with minimal external components.

FAQ

What is the maximum recommended operating current for continuous ZR285F02TA operation?

The datasheet specifies 20 mA as the recommended maximum continuous operating current. While the device can withstand transient currents up to 200 mA, sustained operation above 20 mA exceeds its 330 mW power dissipation limit at 25°C ambient and risks thermal instability or accelerated aging. Derating is required above 25°C.

Can ZR285F02TA be used with ceramic output capacitors?

Yes-ZR285F02TA is explicitly characterized as stable with capacitive loads, including ceramic capacitors up to 10 nF. This eliminates need for series resistance or tantalum alternatives, simplifying layout and improving transient response in precision analog circuits.

Is pin 1 of ZR285F02TA electrically connected internally?

No-pin 1 is not internally connected (NC). The datasheet states it may be left floating or tied to pin 2 (anode) for mechanical reinforcement or thermal symmetry, but it carries no electrical function in normal operation.

Why is ZR285F02TA marked "not recommended for new designs"?

This status reflects Diodes Incorporated's internal roadmap guidance-not obsolescence. The part remains fully manufactured and supported, but newer alternatives like the AP2112K-2.5 (LDO) or ZR431 (adjustable shunt) offer improved specs. Design reuse is acceptable; new designs should evaluate trade-offs in tempco, noise, and supply current.

ZR285F02TA 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

ZR285F02TA FAQ

1.How can I place an order for ZR285F02TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285F02TA 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 ZR285F02TA reliable?

The price and inventory of ZR285F02TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285F02TA is usually 5 days.

3.What payment methods are accepted for ZR285F02TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285F02TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285F02TA?

ZR285F02TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285F02TA 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 ZR285F02TA?

For technical support, including ZR285F02TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285F02TA requirements.

6.How does Aetrix verify that ZR285F02TA is sourced from the original manufacturer or authorized distributors?

All ZR285F02TA 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 ZR285F02TA meets industry standards.

7.What is the process for return or replacement of ZR285F02TA?

All ZR285F02TA units undergo pre-shipment inspection (PSI). If there is an issue with ZR285F02TA, 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 ZR285F02TA part is unused and in its original packaging.

Return procedure for ZR285F02TA:

1.Submit a request within 90 days.

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

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