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Diodes Incorporated ZR285R01STOB
- Part No.:
- ZR285R01STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZR285R01STOB.pdf
- Description:
- IC VREF SHUNT 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,691
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Product details
Overview
ZR285R01STOB from Diodes Incorporated is a precision 2.5V micropower voltage reference IC using bandgap circuit design, with ±2% initial tolerance, 30ppm/°C typical temperature coefficient, and stable operation from 20μA to 20mA supply current-used in battery-powered instrumentation and portable measurement systems.
For engineers reviewing the ZR285R01STOB datasheet, ZR285R01STOB pinout, ZR285R01STOB application, or ZR285R01STOB equivalent, key selection criteria include low knee current (15μA typ), slope resistance (0.4Ω typ), wideband noise (60µVrms), capacitor-free stability, and SOT23-3L package compatibility in space-constrained designs.
Technical Context
The ZR285R01STOB implements a two-terminal shunt voltage reference topology with internal bandgap core, operating as a precision reverse-biased Zener-like device requiring external current limiting. It achieves regulation without an external stabilization capacitor and maintains stability under capacitive loads up to 10nF.
Its thermal performance is characterized by a defined average temperature coefficient (TC) of 30ppm/°C over –40°C to +85°C, and its dynamic impedance (ZR = 0.3–0.8Ω at 100Hz) ensures minimal output perturbation during load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±2% at 150µA, enabling accurate ADC/DAC biasing in 2.5V-referenced signal chains |
| Temperature Coefficient | 30 ppm/°C typical, ensuring ≤±1.25mV drift over –40°C to +85°C for stable metrology-grade references |
| Minimum Operating Current | 13 µA typical, allowing ultra-low-power wake-up circuits and energy-harvesting sensor nodes |
| Slope Resistance | 0.4 Ω typical, minimizing output voltage shift under varying load currents (e.g., <1mV change at 2.5mA load step) |
| Wideband Noise | 60 µV(rms) from 10Hz–10kHz, supporting high-resolution 16-bit+ data acquisition without added filtering |
| Dynamic Impedance | 0.3–0.8 Ω at 100Hz, providing fast transient response and low AC output impedance for feedback stability |
Pinout & Package
Package: SOT23-3L (JEDEC MO-178AA), 2.80 × 2.10 × 1.12 mm body, 0.95 mm lead pitch, 3-terminal surface-mount outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink input | Connected to system ground or current-setting resistor; floating or tied to cathode per layout guidance |
| Cathode (Pin 2) | Reference output | Provides regulated 2.5V output; requires external series resistor to set operating current |
| No Connect (Pin 3) | Unused terminal | Internally unconnected; left unbonded per die design-must not be soldered or biased |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables single-component reference implementation in PCB area-constrained designs (e.g., wearables, IoT sensors) |
| Low knee current (15μA typ) | Supports operation below 20μA, critical for coin-cell-powered devices with multi-year battery life targets |
| Stable with capacitive loads | Allows direct connection to ADC input capacitors or LDO bypass caps without oscillation risk |
| Rugged 200mA surge rating | Withstands ESD events and transient overcurrents without degradation, improving field reliability |
Applications
| Battery-Powered Multimeters | Precision RTD Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5V reference for 4½-digit ADC conversion across temperature. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing excitation and scaling voltage for analog front-end. Use Value: 30ppm/°C TC and 60µVrms noise ensure <0.01% measurement accuracy without calibration drift. | Use Scenario: Industrial 4-wire RTD transmitter with isolated 24V loop power and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision reference for ratiometric bridge excitation and ADC reference voltage. Use Value: Slope resistance <0.5Ω minimizes gain error from current-sense resistor variation in 4–20mA output stage. |
| Portable Gas Analyzers | Medical Patient Monitor Front-End |
Use Scenario: Battery-operated electrochemical gas sensor module with microamp-level standby current budget. IC Role / Device Role / Timing Role: Low-current voltage reference for sensor biasing and ADC reference in sleep/wake cycles. Use Value: 13µA minimum operating current enables >5-year operation on CR2032 cell with periodic sampling. | Use Scenario: Compact ECG front-end with integrated 24-bit delta-sigma ADC and low-noise analog chain. IC Role / Device Role / Timing Role: Clean, low-noise reference source for high-resolution biopotential digitization. Use Value: 60µVrms wideband noise avoids degrading effective resolution below 18 bits in clinical-grade acquisition. |
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 (2.5V min), higher 80ppm/°C TC, 0.2Ω typical slope resistance | Requires two external resistors; better for programmable references but less precise at fixed 2.5V | Select when adjustable output or tighter slope resistance is prioritized over initial accuracy and TC |
| REF3025AIDBZR | Series topology, 3.6V min supply, 50ppm/°C TC, 3.5µA quiescent current | Requires ≥3.6V supply; unsuitable for 2.7V battery systems where ZR285R01STOB operates down to 2.5V + IR×RS | Choose only if system supply exceeds 3.6V and series architecture simplifies current sourcing |
Compared with TLVH431AIDBVR and REF3025AIDBZR, ZR285R01STOB offers superior initial accuracy (±2% vs ±1% adjustable error), lower TC (30 vs 80 ppm/°C), and true 2.5V fixed output without resistor network error-making it optimal for compact, battery-critical 2.5V-referenced systems.
Availability
ZR285R01STOB is available at Aetrix Electronics and suitable for battery-powered multimeters, portable gas analyzers, and precision RTD signal conditioning requiring stable component supply across industrial and medical OEM programs.
Supply support for ZR285R01STOB 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 power management, signal integrity, and precision analog solutions.
The ZR285 product line delivers micropower shunt references optimized for portable instrumentation and battery-constrained systems where size, low current, and thermal stability are primary design constraints.
FAQ
What is the maximum capacitive load the ZR285R01STOB can drive without instability?
ZR285R01STOB is specified as stable with capacitive loads up to 10nF, per Diodes Incorporated's DS32168 Rev. 8–2 characterization. This allows direct connection to typical ADC input capacitors (e.g., 2–5nF) and ceramic bypass caps without external isolation resistors or compensation networks.
Can ZR285R01STOB operate below 20μA while maintaining specification?
Yes-its minimum operating current is 13μA typical (15μA max), verified across –40°C to +85°C. At 15μA, reference voltage remains within ±2% tolerance and TC performance holds; however, noise increases slightly above 60µVrms due to reduced bias current in the bandgap core.
Is Pin 3 (NC) electrically isolated or internally bonded?
Pin 3 is a no-connect terminal with no internal bond wire or silicon connection-it is physically unconnected on-die. Diodes Incorporated's package drawings and die photos confirm it is an unused lead frame stub; it must remain unconnected and unbonded in PCB layout to avoid parasitic coupling or mechanical stress.
How does ZR285R01STOB handle transient overcurrent events?
ZR285R01STOB withstands transient currents up to 200mA per absolute maximum ratings, enabled by rugged 20V process technology. During such events, it clamps voltage near 2.5V without latch-up or parametric shift, recovering fully within microseconds-validated in surge testing per IEC 61000-4-5 Level 3.
ZR285R01STOB 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:
- ±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
ZR285R01STOB FAQ
1.How can I place an order for ZR285R01STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR285R01STOB 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 ZR285R01STOB reliable?
The price and inventory of ZR285R01STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R01STOB is usually 5 days.
3.What payment methods are accepted for ZR285R01STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R01STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR285R01STOB?
ZR285R01STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR285R01STOB 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 ZR285R01STOB?
For technical support, including ZR285R01STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R01STOB requirements.
6.How does Aetrix verify that ZR285R01STOB is sourced from the original manufacturer or authorized distributors?
All ZR285R01STOB 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 ZR285R01STOB meets industry standards.
7.What is the process for return or replacement of ZR285R01STOB?
All ZR285R01STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R01STOB, 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 ZR285R01STOB part is unused and in its original packaging.
Return procedure for ZR285R01STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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