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

Diodes Incorporated ZR285R01STZ

Name: ZR285R01STZ
Brand: Diodes Incorporated
SKU: ZR285R01STZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR285R01STZ

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR285R01STZ.pdf

Description:: IC VREF SHUNT 1% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:4,836

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Product details

Overview

ZR285R01STZ from Diodes Incorporated is a precision 2.5 V micropower voltage reference IC using bandgap circuit design, rated for ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 13 µA to 20 mA. It operates across –40°C to +85°C and delivers low slope resistance (0.4 Ω typ.) for high-accuracy analog sensing in portable instrumentation.

For engineers reviewing the ZR285R01STZ datasheet, ZR285R01STZ pinout, ZR285R01STZ application, or ZR285R01STZ equivalent, key selection criteria include knee current (15 µA typ.), capacitive-load stability without external compensation, wide operating current range (20 µA–20 mA), and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZR285R01STZ functions as a two-terminal shunt-mode voltage reference, sinking current to maintain a precise 2.5 V reverse breakdown voltage at its cathode. Its bandgap core achieves thermal stability without requiring external trimming or calibration components.

It exhibits low dynamic impedance (0.3–0.8 Ω at 100 Hz) and wideband noise of 60 µV(rms) over 10 Hz–10 kHz, enabling use in high-resolution ADC biasing and precision DAC reference circuits where low-noise, low-drift references are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±2% - defines absolute accuracy of output under 150 µA test current
Tempco (TC)	30 ppm/°C typ. - ensures ≤±1.2 mV drift over full –40°C to +85°C range
Min Operating Current	13 µA - enables ultra-low-power wake-up reference in battery-backed systems
Slope Resistance	0.4 Ω typ. - minimizes output voltage shift under load current variation
Dynamic Impedance	0.3 Ω @ 100 Hz - supports fast transient response in closed-loop regulator feedback
Wideband Noise	60 µV(rms), 10 Hz–10 kHz - suitable for 16-bit+ data acquisition front-ends
Capacitive Load Stability	Stable with any capacitive load - eliminates need for external compensation capacitor

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.10 × 1.12 mm body height, gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (floating or tied to Pin 2)	Internal connection optional; tying to cathode reduces leakage path in high-impedance bias networks
Pin 2	Cathode (output reference node)	2.5 V reference voltage node; sinks current to regulate voltage at this terminal
Pin 3	Cathode (common with Pin 2)	Electrically bonded to Pin 2; provides second cathode connection for improved thermal/current sharing

Key Features

Feature	Design Value
No external capacitor required	Enables direct integration into compact sensor signal chains without layout overhead or stability tuning
15 µA typical knee current	Allows reliable turn-on and regulation even in microamp-level standby modes of IoT endpoints
0.4 Ω typical slope resistance	Reduces output error to <100 µV per 250 µA load change - critical for ratiometric sensor excitation
Stable with capacitive loads	Supports direct connection to ADC input capacitors or LDO bypass caps without oscillation risk
Industrial temperature range	Validated performance from –40°C to +85°C ensures reliability in field-deployed metering hardware

Applications

Portable Multimeters

Precision RTD Signal Conditioning

Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 200 mV full-scale ADC measurement.

IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric excitation and ADC reference simultaneously.

Use Value: ±2% initial tolerance and 30 ppm/°C TC ensure <0.05% total measurement error across operating temperature.

Use Scenario: 4-wire RTD bridge amplifier in industrial temperature transmitter with 24-bit sigma-delta ADC.

IC Role / Device Role / Timing Role: Low-noise, low-drift reference for both bridge excitation and ADC reference rails.

Use Value: 60 µV(rms) noise and 0.4 Ω slope resistance minimize quantization uncertainty and gain drift.

Battery-Powered Data Loggers

Calibration Equipment Reference Source

Use Scenario: Solar-powered environmental logger with 10-year battery life targeting <1 µA sleep current.

IC Role / Device Role / Timing Role: Micropower reference active only during sampling bursts, sinking 15–20 µA.

Use Value: 13 µA minimum operating current enables regulation within tight energy budgets without startup delay.

Use Scenario: Benchtop calibrator generating traceable 2.5 V outputs for field instrument verification.

IC Role / Device Role / Timing Role: Primary reference element in buffered, low-drift output stage.

Use Value: Stable 2.5 V output with <1 Ω dynamic impedance supports low-output-impedance sourcing up to 20 mA.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBZR	Adjustable (2.5–36 V) vs. fixed 2.5 V; higher 100 ppm/°C max TC; 0.2 Ω typical slope resistance	Requires external resistor divider; better for programmable reference designs but adds component count and tempco error	Choose when adjustable output or tighter slope resistance is prioritized over simplicity and guaranteed 2.5 V accuracy
REF3025AIDBZR	Series topology; 50 ppm/°C max TC; 3.5 µA quiescent current; requires input-to-output headroom	Needs ≥0.5 V supply margin; unsuitable for low-voltage battery operation below 3.0 V	Prefer when ultra-low quiescent current and superior long-term stability outweigh shunt topology constraints

Compared with TLVH431AIDBZR and REF3025AIDBZR, ZR285R01STZ offers fixed 2.5 V accuracy with lowest system component count, no headroom requirement, and proven stability in capacitive-load environments - ideal for cost-sensitive, space-constrained, single-voltage-reference applications.

Availability

ZR285R01STZ is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition systems, and battery-powered metering equipment requiring stable component supply and long-lifecycle availability.

Supply support for ZR285R01STZ 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 power management, signal integrity, and precision analog solutions.

ZR285R01STZ belongs to Diodes' precision voltage reference product line, engineered for low-power, high-accuracy applications in portable and industrial measurement systems where size, stability, and simplicity are critical.

FAQ

What is the maximum capacitive load the ZR285R01STZ can drive without instability?

ZR285R01STZ is explicitly characterized as stable with any capacitive load - no upper limit is specified in the datasheet. This eliminates the need for external series resistance or compensation networks, making it suitable for direct connection to ADC input capacitors, LDO bypass caps, or filter stages without risk of oscillation or overshoot.

Can ZR285R01STZ operate reliably below 20 µA?

Yes - the device specifies a typical knee current of 15 µA and minimum operating current of 13 µA. At 15 µA, it achieves full regulation and specified accuracy. Operation down to 13 µA is guaranteed, enabling use in ultra-low-power wake-up circuits and energy-harvesting applications where current budgets are sub-20 µA.

How does the dual-cathode pin configuration (Pins 2 and 3) improve performance?

Pins 2 and 3 are internally bonded cathodes, providing parallel current paths and reduced thermal resistance. This improves current-handling capability and thermal stability under sustained 20 mA operation, while also lowering effective slope resistance and enhancing long-term drift behavior in high-reliability measurement systems.

Is ZR285R01STZ compatible with lead-free reflow processes?

Yes - the SOT23-3 package is qualified for standard lead-free reflow profiles (J-STD-020), including peak temperatures up to 260°C. The device's 20 V absolute maximum rating and rugged 200 mA surge tolerance further support robust manufacturing yield in automated assembly lines.

ZR285R01STZ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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

Series:: -

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 20 mA

Tolerance:: ±1%

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

ZR285R01STZ FAQ

1.How can I place an order for ZR285R01STZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR285R01STZ 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 ZR285R01STZ reliable?

The price and inventory of ZR285R01STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R01STZ is usually 5 days.

3.What payment methods are accepted for ZR285R01STZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R01STZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR285R01STZ?

ZR285R01STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR285R01STZ 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 ZR285R01STZ?

For technical support, including ZR285R01STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R01STZ requirements.

6.How does Aetrix verify that ZR285R01STZ is sourced from the original manufacturer or authorized distributors?

All ZR285R01STZ 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 ZR285R01STZ meets industry standards.

7.What is the process for return or replacement of ZR285R01STZ?

All ZR285R01STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R01STZ, 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 ZR285R01STZ part is unused and in its original packaging.

Return procedure for ZR285R01STZ:

1.Submit a request within 90 days.

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

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