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Analog Devices Inc. ADR291WFRZ-RL
- Part No.:
- ADR291WFRZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADR291WFRZ-RL.pdf
- Description:
- IC VREF SERIES 0.33% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,518
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Product details
Overview
ADR291WFRZ-RL from Analog Devices is a low-noise, micropower 2.5 V precision voltage reference using XFET® technology, designed for high-accuracy analog signal conditioning in automotive and industrial systems. It delivers ±0.12% initial accuracy, 15 ppm/°C max temperature coefficient, 8 μVp-p (0.1 Hz to 10 Hz) noise, and operates from 2.8 V to 15 V supply with only 15 μA max quiescent current.
For engineers reviewing the ADR291WFRZ-RL datasheet, ADR291WFRZ-RL pinout, ADR291WFRZ-RL application, or ADR291WFRZ-RL equivalent, key selection criteria include automotive-grade temperature range (−40°C to +125°C), SOIC_N package compatibility, low-noise performance in battery-powered ADC/DAC references, and pin compatibility with REF02/REF19x series.
Technical Context
The ADR291WFRZ-RL implements an XFET® reference architecture-distinct from bandgap or buried Zener topologies-delivering one-quarter the voltage noise of comparable bandgap references at equal bias current. Its series topology enables stable 2.5 V output regulation across wide input voltage (2.8 V–15 V) and load (0–5 mA) ranges.
It features ultralinear temperature drift behavior, <50 ppm thermal hysteresis, and 50 ppm long-term stability after 1000 hours at 125°C. Line regulation is specified up to 200 ppm/V and load regulation up to 200 ppm/mA over the full automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±0.12% (±3.0 mV) - ensures accurate scaling for 12-bit+ ADCs without calibration |
| Temp Coefficient | 15 ppm/°C max - contributes ≤375 ppm error over −40°C to +125°C span |
| Noise (0.1–10 Hz) | 8 μVp-p - supports high-resolution measurement in sub-16-bit precision systems |
| Supply Current | 15 μA max - enables >10-year battery life in always-on sensor nodes |
| Output Current | 5 mA - drives multiple SAR ADC references or op-amp bias networks directly |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
ADR291WFRZ-RL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and narrow body profile. Five pins are internally unconnected (NC) and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | NC | No internal connection; must be left unconnected per datasheet guidance |
| 2 | VIN | Input supply terminal; accepts 2.8 V to 15 V with 18 V absolute max rating |
| 4 | GND | Analog ground reference; requires low-impedance return path for noise control |
| 6 | VOUT | Stable 2.5 V reference output; capable of sourcing up to 5 mA with <200 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Core | Delivers 8 μVp-p low-frequency noise and <15 ppm/°C drift-superior to bandgap alternatives in precision metrology |
| Automotive Qualification | Specified and tested across −40°C to +125°C, meeting AEC-Q100 stress requirements for engine control and battery monitoring |
| Pin Compatibility | Direct replacement for REF02 and REF19x series in existing layouts-no PCB redesign needed |
| Micropower Operation | 12 μA typical / 15 μA max supply current enables use in energy-constrained IoT sensors and portable instrumentation |
Applications
| Automotive Battery Monitoring | High-Resolution Data Acquisition |
|---|---|
Use Scenario: Real-time Li-ion cell voltage measurement in BMS modules requiring ±1 mV accuracy over vehicle lifetime. IC Role / Device Role / Timing Role: Precision 2.5 V reference for 16-bit SAR ADCs digitizing battery stack voltages. Use Value: 15 ppm/°C tempco and 50 ppm long-term drift ensure measurement integrity across thermal cycling and aging. | Use Scenario: Signal conditioning front-end for industrial process transmitters with 4–20 mA loop power constraints. IC Role / Device Role / Timing Role: Low-noise, micropower reference for sigma-delta ADCs and programmable gain instrumentation amplifiers. Use Value: 8 μVp-p noise and 12 μA quiescent current enable >100 dB SNR while extending battery life beyond 5 years. |
| Medical Sensor Interfaces | Portable Test Equipment |
Use Scenario: ECG and EEG analog front-ends where baseline stability and low 1/f noise are critical for microvolt-level biopotential detection. IC Role / Device Role / Timing Role: Primary voltage reference for ultra-low-noise instrumentation amplifiers and anti-aliasing filters. Use Value: XFET architecture eliminates Zener-related popcorn noise and provides predictable, linear drift behavior over patient temperature range. | Use Scenario: Handheld multimeters and portable oscilloscopes requiring calibrated DC voltage references with minimal self-heating error. IC Role / Device Role / Timing Role: Stable 2.5 V source for auto-ranging ADC reference switching and DAC output calibration. Use Value: 0.12% initial accuracy and <200 ppm/V line regulation maintain calibration traceability across varying battery voltage and ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF192GSZ-REEL | 2.5 V output, ±0.1% initial accuracy, 20 ppm/°C max tempco, 35 μA supply current | Higher quiescent current limits use in ultra-low-power designs; wider tempco affects wide-temperature accuracy | Preferred when tighter initial accuracy is prioritized over noise and power; not pin-compatible |
| ADR3425ARJZ-R7 | 2.5 V output, ±0.1% initial accuracy, 10 ppm/°C max tempco, 100 μA supply current, 10 mA output drive | Higher power consumption and larger SOT-23-6 footprint; better tempco but higher noise (12 μVp-p) | Selected for improved temperature stability in non-battery applications where board space allows SOT-23 |
Compared with REF192GSZ-REEL and ADR3425ARJZ-R7, the ADR291WFRZ-RL uniquely balances ultra-low noise (8 μVp-p), micropower operation (15 μA), and automotive qualification-making it optimal for battery-powered precision measurement where both accuracy and longevity are critical.
Availability
ADR291WFRZ-RL is available at Aetrix Electronics and suitable for automotive battery management, high-resolution data acquisition, medical sensor interfaces, and portable test equipment requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for ADR291WFRZ-RL 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADR291WFRZ-RL belongs to Analog Devices' precision voltage reference product line, engineered specifically for automotive and industrial applications demanding low noise, micropower operation, and guaranteed performance across extreme temperatures.
FAQ
What is the maximum supply voltage for ADR291WFRZ-RL?
The ADR291WFRZ-RL has an absolute maximum supply voltage rating of 18 V, with recommended operating range from 2.8 V to 15 V. Exceeding 18 V may cause permanent damage. The device maintains specified performance-including 2.5 V output accuracy and 15 ppm/°C tempco-within the 2.8 V–15 V window across its full −40°C to +125°C temperature range.
Is ADR291WFRZ-RL pin-compatible with REF02 or REF19x devices?
Yes, the ADR291WFRZ-RL is explicitly pin-compatible with REF02 and REF19x series voltage references in the same 8-lead SOIC_N package. Pin assignments (VIN on Pin 2, GND on Pin 4, VOUT on Pin 6) match exactly, and NC pins align. This allows drop-in replacement in existing designs without layout changes, provided supply and load conditions fall within ADR291WFRZ-RL's specifications.
What does the 'W' grade signify in ADR291WFRZ-RL?
The 'W' grade in ADR291WFRZ-RL denotes automotive qualification, specifying operation across −40°C to +125°C and compliance with AEC-Q100 stress testing requirements. It also indicates tighter initial accuracy (±0.12%) compared to the standard ADR291 (±0.332%), lower noise (8 μVp-p vs. typical 10 μVp-p), and enhanced long-term stability (50 ppm vs. 100 ppm after 1000 h at 125°C).
Can ADR291WFRZ-RL drive a 5 kΩ load continuously?
Yes, the ADR291WFRZ-RL can continuously drive a 5 kΩ load (equivalent to 0.5 mA at 2.5 V) with negligible impact on accuracy. Its 5 mA maximum output current and 200 ppm/mA load regulation ensure output deviation remains below ±0.1 mV under this condition. For heavier loads approaching 5 mA, verify thermal derating and PCB copper area per θJA = 158°C/W.
Does ADR291WFRZ-RL require an output capacitor for stability?
No, the ADR291WFRZ-RL is internally compensated and does not require an external output capacitor for stability. However, a 1 μF ceramic capacitor placed close to the VOUT and GND pins is recommended to reduce high-frequency noise and improve transient response-especially in noisy automotive or industrial environments. Avoid tantalum or electrolytic capacitors due to ESR-related instability risks.
ADR291WFRZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.33%
- Temperature Coefficient:
- 15ppm/°C
- Noise - 0.1Hz to 10Hz:
- 8µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3V ~ 15V
- Current - Supply:
- 15µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADR291WFRZ-RL FAQ
1.How can I place an order for ADR291WFRZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR291WFRZ-RL 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 ADR291WFRZ-RL reliable?
The price and inventory of ADR291WFRZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR291WFRZ-RL is usually 5 days.
3.What payment methods are accepted for ADR291WFRZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR291WFRZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR291WFRZ-RL?
ADR291WFRZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR291WFRZ-RL 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 ADR291WFRZ-RL?
For technical support, including ADR291WFRZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR291WFRZ-RL requirements.
6.How does Aetrix verify that ADR291WFRZ-RL is sourced from the original manufacturer or authorized distributors?
All ADR291WFRZ-RL 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 ADR291WFRZ-RL meets industry standards.
7.What is the process for return or replacement of ADR291WFRZ-RL?
All ADR291WFRZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADR291WFRZ-RL, 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 ADR291WFRZ-RL part is unused and in its original packaging.
Return procedure for ADR291WFRZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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