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Analog Devices Inc. ADR381ARTZ-REEL7
- Part No.:
- ADR381ARTZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADR381ARTZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.24% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,899
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Product details
Overview
ADR381ARTZ-REEL7 from Analog Devices is a precision 2.500 V band gap voltage reference IC in a 3-lead SOT-23 package, delivering ±6 mV initial accuracy, 25 ppm/°C max temperature coefficient, and 120 μA max quiescent current for low-power, high-stability analog signal chains in battery-powered instrumentation and data acquisition systems.
For engineers reviewing the ADR381ARTZ-REEL7 datasheet, ADR381ARTZ-REEL7 pinout, ADR381ARTZ-REEL7 application, or ADR381ARTZ-REEL7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The ADR381ARTZ-REEL7 employs patented temperature drift curvature correction to minimize nonlinearity across −40°C to +85°C, achieving 5–25 ppm/°C TCVOUT depending on temperature range. Its micropower, low-dropout architecture sustains stable 2.500 V output with only 300 mV headroom above VOUT at ≤2 mA load.
It features 70 ppm/mA load regulation, 25 ppm/V line regulation, 5 μV p-p (0.1 Hz–10 Hz) voltage noise, and 20 μs turn-on settling time - all specified under industrial temperature conditions and validated for operation from 2.8 V to 18 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.494 V to 2.506 V (±6 mV absolute error at 25°C; enables 0.24% full-scale accuracy in 12-bit ADC references) |
| Temp Coefficient | 5–25 ppm/°C (max over −40°C to +85°C; ensures ≤62.5 ppm total drift across full industrial range) |
| Quiescent Current | 100–120 μA (max at 25°C; supports >10-year battery life in 3 V coin-cell applications) |
| Load Regulation | 70 ppm/mA (translates to ±0.175 mV shift per mA load change; critical for sensor front-end stability) |
| Line Regulation | 10–25 ppm/V (≤0.0625 mV/V variation; maintains accuracy despite Li-ion battery discharge from 4.2 V to 3.0 V) |
| Min Headroom | 300 mV (enables operation from 2.8 V supply; compatible with single-cell alkaline or LiFePO₄ systems) |
| Voltage Noise | 5 μV p-p (0.1 Hz–10 Hz; suitable for high-resolution 16-bit+ SAR and delta-sigma ADCs) |
Pinout & Package
Package: 3-lead SOT-23 (RT-3), JEDEC-compliant, 2.90 mm × 1.30 mm footprint, θJA = 333°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply terminal | Accepts 2.8 V to 18 V; requires ≥300 mV above VOUT for regulation; no input capacitor required but improves transient response |
| VOUT (Pin 2) | Stable 2.500 V reference output | Source up to 5 mA; output impedance <1 Ω below 10 Hz; stable without output capacitor but benefits from 0.1 μF for noise reduction |
| GND (Pin 3) | Analog ground reference | Must be low-impedance connection; separates reference return from digital/power grounds to avoid noise coupling into precision analog paths |
Key Features
| Feature | Design Value |
|---|---|
| Patented curvature-corrected band gap | Reduces temperature-induced nonlinearity, enabling 25 ppm/°C max TCVOUT over full −40°C to +85°C range |
| Micropower low-dropout operation | Regulates from 2.8 V supply (300 mV headroom), supporting direct interface with single-cell batteries and energy-harvesting sources |
| Low 5 μV p-p noise (0.1 Hz–10 Hz) | Preserves ENOB in 16-bit+ data converters; eliminates need for external noise filtering in portable medical sensors |
| 70 ppm/mA load regulation | Ensures <±0.175 mV output shift across full 0–5 mA load range, critical for ratiometric sensor excitation and DAC reference stability |
| 20 μs turn-on settling | Enables power-gating in duty-cycled systems (e.g., wireless sensor nodes), reducing average current without sacrificing wake-up latency |
Applications
| Battery-Powered Instrumentation | Portable Medical Instruments |
|---|---|
Use Scenario: Handheld multimeter using 16-bit SAR ADC with ratiometric measurement against internal reference. IC Role / Device Role / Timing Role: Primary 2.500 V reference for ADC and analog front-end; establishes absolute voltage scale independent of supply variation. Use Value: ±6 mV initial accuracy and 25 ppm/°C TCVOUT ensure <0.1% total error over temperature, meeting Class II handheld meter specifications. | Use Scenario: Wearable ECG monitor powered by CR2032 coin cell, sampling at 1 kSPS with 14-bit resolution. IC Role / Device Role / Timing Role: Low-noise, micropower reference for analog signal chain including instrumentation amplifier and anti-alias filter. Use Value: 5 μV p-p noise and 120 μA quiescent current enable >300-hour battery life while maintaining diagnostic-grade signal fidelity. |
| Data Acquisition Systems | Industrial Process Control |
Use Scenario: 8-channel isolated DAQ module with simultaneous sampling, operating from 3.3 V rail. IC Role / Device Role / Timing Role: Per-channel reference for 12-bit ADCs; decoupled via local 0.1 μF bypass to suppress crosstalk. Use Value: 70 ppm/mA load regulation prevents inter-channel gain mismatch during dynamic load switching across channels. | Use Scenario: Loop-powered 4–20 mA transmitter with HART modulation, requiring stable 2.5 V reference for DAC and sensor conditioning. IC Role / Device Role / Timing Role: Precision voltage source for current-loop DAC and RTD bridge excitation. Use Value: 300 mV dropout and −40°C to +85°C rating allow operation directly from 3.0 V loop supply across full industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V output, ±2 mV initial accuracy (tighter), 50 ppm/°C max TCVOUT (higher), 50 μA typical IQ | Lower power but higher drift; less suitable for wide-temperature industrial use | Prefer for ultra-low-power, narrow-temp consumer devices where 50 ppm/°C drift is acceptable |
| MAX6025AEUR+T | 2.5 V output, ±3 mV initial accuracy, 20 ppm/°C max TCVOUT, 35 μA IQ, SOT-23-3 | Lower drift and lower power, but rated only to +70°C (not +85°C) | Prefer for commercial-temp applications needing tighter drift and longer battery life |
Compared with REF3025AIDBZR and MAX6025AEUR+T, the ADR381ARTZ-REEL7 trades slightly higher initial error for superior temperature stability over the full industrial range and higher output drive capability - making it optimal for battery-powered test equipment and process transmitters requiring consistent accuracy from −40°C to +85°C.
Availability
ADR381ARTZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical instruments, data acquisition systems, and industrial process control requiring stable component supply with guaranteed long-term sourcing.
Supply support for ADR381ARTZ-REEL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADR38x series was designed specifically for micropower, low-dropout precision voltage referencing in space-constrained, battery-operated industrial and medical systems demanding high accuracy across wide temperature ranges.
FAQ
What is the nominal output voltage of the ADR381ARTZ-REEL7?
The ADR381ARTZ-REEL7 has a nominal output voltage of 2.500 V, with a guaranteed range of 2.494 V to 2.506 V at 25°C. This 2.5 V reference is laser-trimmed and optimized for high-accuracy applications such as precision ADCs and DACs. The ADR381ARTZ-REEL7 achieves this voltage using a curvature-corrected band gap architecture that minimizes temperature-induced nonlinearity across its full operating range.
Does the ADR381ARTZ-REEL7 require an output capacitor for stability?
No, the ADR381ARTZ-REEL7 does not require an output capacitor for stability under any load condition. It remains stable with capacitive loads from 0 to ≥100 nF. However, adding a 0.1 μF ceramic capacitor at the VOUT pin reduces low-frequency noise by ~30% and improves load transient response - though it increases turn-on settling time proportionally to capacitance value. The ADR381ARTZ-REEL7's internal design eliminates phase-margin concerns present in older shunt or series references.
What is the minimum supply voltage required for the ADR381ARTZ-REEL7 to regulate properly?
The ADR381ARTZ-REEL7 requires a minimum supply voltage of VOUT + 300 mV, i.e., 2.8 V, to maintain regulation at loads ≤2 mA. At higher loads or elevated temperatures, headroom may increase slightly due to internal dropout characteristics. The ADR381ARTZ-REEL7 is specified to operate from 2.8 V to 18 V, making it compatible with single-cell LiFePO₄, alkaline, or regulated 3.3 V supplies - unlike many references requiring ≥4.5 V input.
How does the ADR381ARTZ-REEL7 perform in terms of long-term stability?
The ADR381ARTZ-REEL7 exhibits 50 ppm maximum long-term drift after 1000 hours of operation at 50°C - a representative accelerated aging condition. This equates to approximately ±0.0125 mV drift over one year in typical field use. The ADR381ARTZ-REEL7 achieves this via precision laser trimming and proprietary circuit techniques that reduce stress-induced parameter shifts, ensuring consistent performance in deployed instrumentation and medical devices.
Can the ADR381ARTZ-REEL7 be used in a negative reference configuration?
Yes, the ADR381ARTZ-REEL7 can be used to generate a precision negative reference when paired with an op amp in an active integrator topology - eliminating the need for matched resistors. In this configuration, the ADR381ARTZ-REEL7 drives the op amp's non-inverting input, and the feedback loop forces the output to a stable negative voltage referenced to ground. This method avoids resistor-matching errors and is validated in Analog Devices' application note for current-output DAC interfaces.
ADR381ARTZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- ADR38
- 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:
- ±0.24%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 5µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.8V ~ 18V
- Current - Supply:
- 140µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ADR381ARTZ-REEL7 FAQ
1.How can I place an order for ADR381ARTZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR381ARTZ-REEL7 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 ADR381ARTZ-REEL7 reliable?
The price and inventory of ADR381ARTZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR381ARTZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR381ARTZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR381ARTZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR381ARTZ-REEL7?
ADR381ARTZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR381ARTZ-REEL7 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 ADR381ARTZ-REEL7?
For technical support, including ADR381ARTZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR381ARTZ-REEL7 requirements.
6.How does Aetrix verify that ADR381ARTZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR381ARTZ-REEL7 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 ADR381ARTZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR381ARTZ-REEL7?
All ADR381ARTZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR381ARTZ-REEL7, 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 ADR381ARTZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR381ARTZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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