My Inquiry
My Account
Diodes Incorporated ZR285R02STOA
- Part No.:
- ZR285R02STOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZR285R02STOA.pdf
- Description:
- IC VREF SHUNT 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZR285R02STOA 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 13 µA to 20 mA-ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the ZR285R02STOA datasheet, ZR285R02STOA pinout, ZR285R02STOA application, or ZR285R02STOA equivalent, key selection criteria include low knee current (15 µA typ), no external capacitor requirement, slope resistance (0.4 Ω typ), wide operating current range (20 µA–20 mA), and SOT23-3 package compatibility in space-constrained designs.
Technical Context
The ZR285R02STOA operates as a two-terminal shunt voltage reference, sinking current to maintain a precise 2.5 V output across its cathode-anode terminals. It achieves stability without external compensation and remains functional with capacitive loads up to 1 µF.
Its bandgap-based architecture delivers low thermal drift (30 ppm/°C typ) and low dynamic impedance (0.3 Ω typ at 100 Hz), enabling high-accuracy analog signal conditioning in low-power sensor front-ends and ADC biasing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±2% (2.45–2.55 V); ensures accurate ADC reference or DAC bias within tight system tolerances |
| Tempco (TC) | 30 ppm/°C typical; limits voltage drift to ≤±1.2 mV over –40°C to +85°C industrial range |
| Min Operating Current | 13 µA typical; enables ultra-low-power wake-up and standby modes in battery systems |
| Slope Resistance | 0.4 Ω typical; maintains regulation stability under varying load currents without oscillation |
| Dynamic Impedance | 0.3 Ω at 100 Hz; suppresses ripple and noise coupling into precision analog stages |
| Wideband Noise | 60 µV(rms), 10 Hz–10 kHz; supports high-resolution (≥16-bit) measurement accuracy |
| Capacitive Load Stability | Stable with ≥0 pF external capacitance; eliminates need for layout-compromising bypass caps |
Pinout & Package
Package: SOT23-3 (JEDEC MO-215AA), 2.80 × 2.10 × 1.12 mm body, gull-wing leads, tape-and-reel (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Output reference node | Connected to load and feedback path; sinks current to regulate 2.5 V at this terminal |
| Anode (Pin 2) | Ground reference | Return path for reference current; must be low-impedance to avoid ground bounce errors |
| No-Connect (Pin 3) | Unused terminal | Internally floating; may be left unconnected or tied to anode per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct integration into compact PCB layouts without stability-compromising compensation networks |
| Low knee current (15 µA typ) | Permits reliable start-up and regulation in energy-harvesting and coin-cell applications |
| Stable with capacitive loads | Supports direct connection to ADC input capacitors or LDO bypass networks without phase margin loss |
| Rugged transient handling (200 mA surge) | Withstands ESD and inrush events without latch-up or parametric shift in field-deployed equipment |
| Fast turn-on (<5 µs) | Meets timing requirements for duty-cycled sensor interfaces and burst-mode data acquisition |
Applications
| Portable Multimeter Front-End | Precision RTD Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter measuring DC voltage with 0.1% accuracy over –10°C to +50°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for 24-bit sigma-delta ADC and auto-ranging amplifier gain control. Use Value: 30 ppm/°C tempco and 60 µV noise ensure <±0.05% reference error contribution across operating range. | Use Scenario: Industrial 4-wire RTD bridge circuit in programmable logic controller I/O module. IC Role / Device Role / Timing Role: Precision excitation reference for constant-current source driving Pt100 sensor, rejecting common-mode noise. Use Value: 0.4 Ω slope resistance minimizes current-source compliance error during 4–20 mA loop transients. |
| Battery-Powered Data Logger | Calibration-Grade Power Supply Monitor |
Use Scenario: Solar-charged environmental logger sampling temperature/humidity every 5 minutes for 5-year deployment. IC Role / Device Role / Timing Role: Low-power reference for microcontroller's internal ADC and voltage supervisor threshold generation. Use Value: 13 µA minimum operating current extends battery life beyond 3 years on CR2032 cell. | Use Scenario: Rack-mounted power supply with ±0.5% output voltage regulation and remote sense capability. IC Role / Device Role / Timing Role: Secondary reference for isolated feedback optocoupler error amplifier in secondary-side regulation loop. Use Value: Stable 2.5 V output under 20 µA–20 mA load variation ensures consistent regulation across line/load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable (2.5 V set via resistors), 2% tolerance, 92 ppm/°C max, 0.2 Ω typical slope resistance | Requires two external resistors; better for designs needing programmable reference voltage | Choose when flexibility in reference voltage setting outweighs board space and component count constraints |
| LM4040C25IDBZR | Fixed 2.5 V, 0.5% tolerance, 50 ppm/°C max, 0.5 Ω typical slope resistance, 65 µV noise | Higher precision but higher min current (60 µA) and less robust surge rating (50 mA) | Prefer when absolute accuracy dominates over ultra-low-power operation and ruggedness |
Compared with TLVH431ACDBVR and LM4040C25IDBZR, the ZR285R02STOA offers superior micropower operation (13 µA min), higher surge tolerance (200 mA), and simpler two-terminal implementation-making it optimal for cost-sensitive, space-constrained, and battery-limited applications where ±2% tolerance is acceptable.
Availability
ZR285R02STOA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, precision sensor signal chains, and industrial calibration equipment requiring stable component supply with long-term traceability.
Supply support for ZR285R02STOA 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, low-power, and cost-optimized components for industrial, computing, and consumer markets.
The ZR285 series belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-quiescent-current applications demanding stable 2.5 V references without external compensation.
FAQ
Can ZR285R02STOA be used in series with a resistor to set a higher reference voltage?
No. The ZR285R02STOA is a two-terminal shunt reference and does not support series resistor programming like adjustable references (e.g., TLVH431). Its output is fixed at 2.5 V and requires external current limiting via a series resistor to sink operating current. Attempting to force higher voltages risks exceeding absolute maximum ratings.
Is Pin 3 (NC) required to be grounded or left floating?
Pin 3 is internally unconnected and may be left floating. Diodes Incorporated's datasheet shows it as "No-Connect" and permits tying it to Pin 2 (anode) for mechanical stability or thermal symmetry-no electrical function is affected either way.
What is the maximum capacitive load the ZR285R02STOA can drive without instability?
The device is specified as stable with any capacitive load, including up to 1 µF, per the datasheet's "stable with capacitive loads" feature. No minimum or maximum capacitance is required-operation is guaranteed from 0 pF to ≥1 µF without external compensation or series resistance.
Does ZR285R02STOA support reverse polarity protection in circuit design?
No. As a shunt reference, the ZR285R02STOA conducts only in forward-biased (cathode positive relative to anode) mode. Reverse polarity applied across its terminals will not regulate and may exceed the 30 mA reverse current absolute maximum rating, risking permanent damage. External diode protection is required for reverse-voltage scenarios.
ZR285R02STOA 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
ZR285R02STOA FAQ
1.How can I place an order for ZR285R02STOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR285R02STOA 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 ZR285R02STOA reliable?
The price and inventory of ZR285R02STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R02STOA is usually 5 days.
3.What payment methods are accepted for ZR285R02STOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R02STOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR285R02STOA?
ZR285R02STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR285R02STOA 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 ZR285R02STOA?
For technical support, including ZR285R02STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R02STOA requirements.
6.How does Aetrix verify that ZR285R02STOA is sourced from the original manufacturer or authorized distributors?
All ZR285R02STOA 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 ZR285R02STOA meets industry standards.
7.What is the process for return or replacement of ZR285R02STOA?
All ZR285R02STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R02STOA, 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 ZR285R02STOA part is unused and in its original packaging.
Return procedure for ZR285R02STOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZR285R02STOA Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
