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Diodes Incorporated ZR285R01
- Part No.:
- ZR285R01
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ZR285R01.pdf
- Description:
- IC VREF SHUNT 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
ZR285R01 from Diodes Incorporated is a precision 2.5 V micropower voltage reference IC using bandgap circuit design, specified with ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 20 μA to 20 mA supply current. It operates without external stabilization capacitors and supports capacitive loads, making it suitable for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the ZR285R01 datasheet, ZR285R01 pinout, ZR285R01 application, or ZR285R01 equivalent, key selection criteria include low knee current (15 μA typ), slope resistance (0.4 Ω typ), wide operating current range (20 μA–20 mA), and industrial temperature range (−40°C to +85°C).
Technical Context
The ZR285R01 implements a bandgap-based reference architecture delivering a fixed 2.5 V reverse breakdown voltage with TC of 30 ppm/°C (typ) over −40°C to +85°C. Its low dynamic impedance (0.3 Ω typ at 100 Hz) and wideband noise of 60 µV(rms) support high-accuracy analog signal conditioning.
It achieves microsecond-scale turn-on settling time and maintains stability under capacitive loading without external compensation. The device tolerates transient currents up to 200 mA and withstands 20 V processing voltage, enabling robust operation in noisy or marginally regulated environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±2% - precise, factory-trimmed output for ADC/DAC biasing and sensor excitation |
| Tempco (TC) | 30 ppm/°C typ - ensures ≤±1.2 mV drift over full −40°C to +85°C range |
| Slope Resistance | 0.4 Ω typ - minimizes load-induced voltage shift during current variation |
| Min Operating Current | 13 µA min - enables ultra-low-power sleep-mode operation in portable devices |
| Dynamic Impedance | 0.3 Ω typ @ 100 Hz - suppresses AC ripple coupling into precision analog stages |
| Wideband Noise | 60 µV(rms), 10 Hz–10 kHz - preserves SNR in 12-bit+ measurement front-ends |
| Knee Current | 15 µA typ - defines lowest current at which regulation remains within spec |
Pinout & Package
Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.10 × 1.12 mm body, gull-wing leads, tape-and-reel packaging (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (floating or tied to Pin 2) | Optional connection point for improved thermal stability; left open or shorted to cathode per layout guidance |
| Pin 2 | Cathode (output) | Provides regulated 2.5 V reference voltage; connects to load and feedback nodes |
| Pin 3 | Anode (input) | Accepts input current (20 µA–20 mA); reverse-biased configuration enables Zener-like operation |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables compact PCB layout in space-constrained portable instruments without stability risk |
| Low knee current (15 µA typ) | Supports continuous regulation during deep-sleep MCU states with minimal quiescent drain |
| Stable with capacitive loads | Eliminates need for isolation resistors when driving ADC sample-hold or op-amp inputs |
| Microsecond turn-on time | Allows on-demand activation in duty-cycled measurement systems, reducing average power |
| Rugged 200 mA surge rating | Withstands ESD transients and inrush events without degradation in field-deployed equipment |
Applications
| Portable Multimeter Front-End | Battery-Powered Data Logger |
|---|---|
Use Scenario: High-impedance voltage measurement with auto-ranging and dual-slope integration. IC Role / Device Role / Timing Role: Precision 2.5 V reference for 16-bit sigma-delta ADC and analog front-end gain calibration. Use Value: 30 ppm/°C tempco and 60 µV(rms) noise ensure <0.01% measurement accuracy across 0–40°C ambient. | Use Scenario: Long-duration environmental monitoring with intermittent sampling every 10 seconds. IC Role / Device Role / Timing Role: Low-current reference source enabling <1 µA system sleep current while retaining regulation. Use Value: 13 µA minimum operating current allows sustained reference operation during 99.9% duty-cycle sleep intervals. |
| Handheld Oscilloscope Probe Calibration | Industrial Sensor Transmitter |
Use Scenario: On-board self-calibration of 10× passive probe attenuation and offset compensation. IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC-controlled calibration voltage generation and comparator thresholds. Use Value: 0.4 Ω slope resistance prevents output droop during fast DAC slewing, preserving calibration fidelity. | Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Reference for ratiometric bridge excitation and ADC reference in isolated analog signal chain. Use Value: Stability under capacitive loads eliminates need for buffer op-amps, reducing BOM count and power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431AIDBVR | Adjustable (1.24–6 V) vs. fixed 2.5 V; higher 75 ppm/°C max TC; 0.2 Ω typical slope resistance | Requires external resistor network; better suited for programmable references or multi-voltage systems | Select when adjustable output or tighter slope resistance is prioritized over guaranteed 2.5 V accuracy |
| REF3025AIDBZR | Fixed 2.5 V; lower 50 ppm/°C max TC; 3.5 µA max quiescent current; requires 1 µF bypass capacitor | Superior tempco but adds capacitor footprint and layout sensitivity; optimized for ultra-low-IQ designs | Select when sub-5 µA IQ and <50 ppm/°C max TC outweigh capacitor dependency and cost premium |
Compared with TLV431AIDBVR and REF3025AIDBZR, the ZR285R01 delivers optimal balance of fixed 2.5 V accuracy, capacitor-free operation, and ruggedness for cost-sensitive, space-constrained industrial instrumentation-without requiring external components or sacrificing surge resilience.
Availability
ZR285R01 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial sensor transmitters requiring stable component supply and long-term obsolescence management.
Supply support for ZR285R01 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, engineered for low-power, space-constrained applications where stability, simplicity, and ruggedness supersede programmability or ultra-low IQ.
FAQ
Can ZR285R01 operate without an external capacitor?
Yes. The ZR285R01 is internally compensated and stable without any external capacitor, even under capacitive loads. This eliminates layout complexity and saves board space-confirmed in the datasheet's "No stabilizing capacitor required" feature and Typical Application Circuit.
What is the maximum safe operating current for ZR285R01?
The recommended operating current is 20 µA to 20 mA, but the device can withstand transient currents up to 200 mA due to its rugged 20 V process design. Continuous operation above 20 mA risks exceeding 330 mW power dissipation in SOT23 at 25°C ambient.
How does ZR285R01 behave at temperatures below −40°C?
The datasheet specifies operation from −40°C to +85°C. Performance outside this range is not characterized: parameters like tempco, noise, and regulation may deviate significantly, and reliability is not guaranteed. Use only within the rated industrial temperature range.
Is ZR285R01 pin-compatible with ZR285F02TA?
Yes. Both share identical SOT23-3 pinout (Anode–Cathode–Anode), same package dimensions, and identical electrical function. ZR285F02TA is marked "Released" with 2% tolerance; ZR285R01 is a functional variant with matching specs and form factor, intended for direct replacement in existing designs.
ZR285R01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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
ZR285R01 FAQ
1.How can I place an order for ZR285R01 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR285R01 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 ZR285R01 reliable?
The price and inventory of ZR285R01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R01 is usually 5 days.
3.What payment methods are accepted for ZR285R01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR285R01?
ZR285R01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR285R01 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 ZR285R01?
For technical support, including ZR285R01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R01 requirements.
6.How does Aetrix verify that ZR285R01 is sourced from the original manufacturer or authorized distributors?
All ZR285R01 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 ZR285R01 meets industry standards.
7.What is the process for return or replacement of ZR285R01?
All ZR285R01 units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R01, 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 ZR285R01 part is unused and in its original packaging.
Return procedure for ZR285R01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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