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Analog Devices Inc. ADR391AUJZ-REEL7
- Part No.:
- ADR391AUJZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ADR391AUJZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.24% TSOT5
- Quantity:
- Payment:
- Shipping:
Inventory:6,490
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Product details
Overview
ADR391AUJZ-REEL7 from Analog Devices is a micropower, low-noise 2.5 V precision voltage reference with shutdown control, featuring ±4 mV initial accuracy (B grade), 9 ppm/°C temperature coefficient, and 5 μVp-p (0.1 Hz to 10 Hz) output noise - optimized for high-accuracy, battery-powered data acquisition systems.
For engineers reviewing the ADR391AUJZ-REEL7 datasheet, ADR391AUJZ-REEL7 pinout, ADR391AUJZ-REEL7 application, or ADR391AUJZ-REEL7 equivalent, this device delivers stable 2.5 V reference performance under ultra-low supply current (140 μA active, 3 μA shutdown), minimal dropout (300 mV), and no external capacitor requirement across −40°C to +125°C operation.
Technical Context
The ADR391AUJZ-REEL7 implements a curvature-corrected band gap architecture where the reference voltage is referenced to VOUT rather than GND, reducing ground noise coupling. Its dual-output topology (VOUT FORCE and SENSE) enables Kelvin sensing for improved load regulation accuracy.
Shutdown mode is TTL/CMOS-compatible: logic low on SHDN disables the reference, placing VOUT in high-impedance state while drawing only 3 μA. The device operates from VIN ≥ VO + 300 mV and supports capacitive loads up to 10 μF without instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal; tightly regulated across load, line, and temperature - enables accurate ADC/DAC biasing and sensor excitation. |
| Initial Accuracy | ±4 mV max (B grade); ensures ≤0.16% error at 25°C without calibration - critical for portable medical instrumentation. |
| Temp Coefficient | 9 ppm/°C (−40°C to +125°C); maintains <±250 μV drift over full range - suitable for automotive engine control modules. |
| Output Noise | 5 μVp-p (0.1 Hz–10 Hz); minimizes quantization uncertainty in 16-bit+ data converters. |
| Supply Current | 140 μA max active / 3 μA max shutdown; extends battery life in multi-year IoT sensor nodes. |
| Dropout Voltage | 300 mV; allows operation from single-cell Li-ion (3.0 V min) or two alkaline cells (3.2 V min) with margin. |
| Load Drive | 5 mA output capability; sufficient to drive SAR ADC references, op-amp bias networks, and small DACs directly. |
Pinout & Package
ADR391AUJZ-REEL7 is housed in a compact 5-lead TSOT package (UJ suffix), measuring 2.1 mm × 2.3 mm × 0.9 mm, with wettable flank leads for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Primary return path for internal circuitry; must be connected to low-impedance system ground plane. |
| 2 - SHDN | Shutdown control input | TTL/CMOS-compatible enable pin; logic low (≤0.8 V) disables output; tie to VIN if unused. |
| 3 - VOUT (SENSE) | Feedback sense node | High-impedance Kelvin sense input; connects directly to load for precise remote voltage regulation. |
| 4 - VOUT (FORCE) | Output drive node | Low-impedance buffered output; supplies current to load while SENSE monitors voltage at point of use. |
| 5 - VIN | Power input | Accepts 2.8 V to 15 V; requires ≥300 mV headroom above 2.5 V output for regulation. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation with 0–10 μF capacitive loads eliminates BOM cost and board space for decoupling. |
| Dual-output Kelvin configuration | VOUT (FORCE) and VOUT (SENSE) pins enable accurate remote sensing - reduces errors from PCB trace resistance. |
| Ultralow 0.1–10 Hz noise | 5 μVp-p noise floor preserves dynamic range in precision weigh scales and ECG front-ends. |
| Automotive-grade qualification | Rated for −40°C to +125°C operation and AEC-Q200 stress testing - validated for under-hood applications. |
| Low dropout & micropower | 300 mV dropout + 140 μA quiescent current enables direct connection to energy-harvesting sources. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Handheld blood glucose meters requiring stable 2.5 V reference for analog front-end ADC conversion. IC Role / Device Role / Timing Role: Precision voltage reference providing excitation and scaling for electrochemical sensor signal chain. Use Value: ±4 mV initial accuracy and 9 ppm/°C drift ensure <±0.2% total measurement error across operating temperature range. | Use Scenario: Wireless sensor node logging temperature and humidity with 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Low-noise reference source for ADC reference input and sensor bridge excitation. Use Value: 5 μVp-p (0.1–10 Hz) noise prevents LSB flicker in high-resolution measurements during extended battery life. |
| Industrial Process Control | Automotive Body Electronics |
Use Scenario: Loop-powered 4–20 mA transmitter with HART modulation in hazardous environments. IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC output scaling and current loop calibration. Use Value: Long-term stability of 50 ppm/1000 hrs minimizes field recalibration frequency in unattended installations. | Use Scenario: Cabin air quality sensor module in automotive infotainment system. IC Role / Device Role / Timing Role: Reference for CO₂ and VOC sensor signal conditioning in wide-temperature automotive environment. Use Value: −40°C to +125°C operation with 9 ppm/°C tempco ensures consistent accuracy across cold start and hot soak 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 |
|---|---|---|---|
| ADR3425ARMZ-R7 | Same 2.5 V output, but higher 12 ppm/°C tempco (A grade); 8 μVp-p noise; requires 1 μF output capacitor. | Lacks shutdown pin; not suitable for power-gated subsystems. | Select when lowest possible cost is prioritized over shutdown capability and ultra-low noise. |
| REF3325AIDBVR | 2.5 V output, 10 ppm/°C tempco, 8.5 μVp-p noise; 150 μA supply current; no shutdown. | Single-output (no FORCE/SENSE); lower output drive (5 mA same, but less stable at high CL). | Choose for simpler layout where Kelvin sensing is unnecessary and shutdown is not required. |
Compared with ADR391AUJZ-REEL7, ADR3425ARMZ-R7 trades shutdown and lower noise for cost and wider availability, while REF3325AIDBVR offers comparable accuracy but lacks both shutdown and dual-output sensing - making ADR391AUJZ-REEL7 uniquely suited for high-reliability, low-power, remotely sensed applications.
Availability
ADR391AUJZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical instrumentation, and industrial process controls requiring stable component supply with guaranteed long-term continuity.
Supply support for ADR391AUJZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADR39x family was designed specifically for ultra-low-power, high-accuracy voltage reference needs in space-constrained, battery-operated systems - emphasizing micropower operation, low noise, and robust thermal performance.
FAQ
What is the maximum load current supported by the ADR391AUJZ-REEL7?
The ADR391AUJZ-REEL7 delivers up to 5 mA of output current while maintaining specified accuracy and regulation. This is sufficient to drive most precision ADC references, op-amp bias networks, and low-power DACs. Exceeding 5 mA may degrade load regulation performance beyond the 140 ppm/mA spec, especially at temperature extremes.
Does the ADR391AUJZ-REEL7 require an external output capacitor?
No, the ADR391AUJZ-REEL7 is internally compensated and operates stably with 0 μF to 10 μF output capacitance. A 0.1 μF ceramic capacitor is recommended for dynamic load transient suppression, but it is not required for stability - reducing BOM count and PCB area.
How does the dual-output (FORCE/SENSE) configuration improve accuracy in the ADR391AUJZ-REEL7?
The ADR391AUJZ-REEL7 uses separate FORCE and SENSE pins to implement Kelvin sensing: VOUT (FORCE) supplies current to the load, while VOUT (SENSE) provides feedback to the internal regulator. This compensates for voltage drop across PCB traces or wiring, maintaining regulation accuracy at the actual load point - critical for high-precision sensor interfaces.
What is the minimum input voltage required for the ADR391AUJZ-REEL7 to regulate properly?
The ADR391AUJZ-REEL7 requires a minimum supply headroom of 300 mV above its 2.5 V output, so VIN must be ≥2.8 V for regulation. At higher temperatures or full load, the required headroom remains 300 mV - verified across −40°C to +125°C per datasheet Figure 14.
Can the ADR391AUJZ-REEL7 be used in automotive applications?
Yes, the ADR391AUJZ-REEL7 is qualified for automotive-grade operation across −40°C to +125°C and meets AEC-Q200 requirements. Its low drift (9 ppm/°C), ultralow noise (5 μVp-p), and shutdown capability make it suitable for cabin sensors, body control modules, and ADAS subsystems where precision and power efficiency are essential.
ADR391AUJZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Series:
- ADR39
- 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 ~ 15V
- Current - Supply:
- 140µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
ADR391AUJZ-REEL7 FAQ
1.How can I place an order for ADR391AUJZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR391AUJZ-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 ADR391AUJZ-REEL7 reliable?
The price and inventory of ADR391AUJZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR391AUJZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR391AUJZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR391AUJZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR391AUJZ-REEL7?
ADR391AUJZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR391AUJZ-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 ADR391AUJZ-REEL7?
For technical support, including ADR391AUJZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR391AUJZ-REEL7 requirements.
6.How does Aetrix verify that ADR391AUJZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR391AUJZ-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 ADR391AUJZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR391AUJZ-REEL7?
All ADR391AUJZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR391AUJZ-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 ADR391AUJZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR391AUJZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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