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Analog Devices Inc. ADR391BUJZ-REEL7
- Part No.:
- ADR391BUJZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ADR391BUJZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.16% TSOT5
- Quantity:
- Payment:
- Shipping:
Inventory:5,968
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Product details
Overview
ADR391BUJZ-REEL7 from Analog Devices is a micropower, low-noise 2.5 V precision band gap voltage reference with shutdown control, 9 ppm/°C temperature coefficient (B grade), ±4 mV initial accuracy, and 5 μVp-p (0.1 Hz to 10 Hz) output noise - designed for high-stability analog signal chains in space-constrained, battery-powered systems.
For engineers reviewing the ADR391BUJZ-REEL7 datasheet, ADR391BUJZ-REEL7 pinout, ADR391BUJZ-REEL7 application, or ADR391BUJZ-REEL7 equivalent, this device delivers verified low dropout (300 mV), ultralow quiescent current (140 μA active / 3 μA shutdown), no external capacitor requirement, and automotive-grade operation from −40°C to +125°C - critical for portable medical instrumentation and data acquisition systems.
Technical Context
The ADR391BUJZ-REEL7 implements patented temperature drift curvature correction to achieve 9 ppm/°C max TC over −40°C to +125°C. Its dual-output architecture separates VOUT(FORCE) and VOUT(SENSE) pins to reject ground noise and enable Kelvin-sense regulation.
Shutdown mode is TTL/CMOS-compatible: logic low on SHDN disables output (high-Z state) and reduces supply current to ≤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, ±4 mV initial accuracy (B grade) - enables direct interface with 12-bit ADCs requiring ≤0.1% full-scale error. |
| Temp Coefficient | 9 ppm/°C max (−40°C to +125°C) - ensures ≤±0.23 mV drift across full industrial temperature range. |
| Output Noise | 5 μVp-p (0.1 Hz to 10 Hz) - preserves SNR in high-resolution sensor front-ends and precision DAC references. |
| Dropout Voltage | 300 mV - allows operation from 2.8 V supply with 2.5 V output, supporting single-cell Li-ion or 3 V coin-cell systems. |
| Quiescent Current | 140 μA max (active), 3 μA max (shutdown) - extends battery life in always-on monitoring devices beyond 10 years. |
| Load Current | 5 mA max - sufficient to drive SAR ADC reference inputs, op-amp bias networks, and small DACs directly. |
| Supply Range | 2.8 V to 15 V - accommodates wide-input industrial supplies while maintaining regulation at minimum headroom. |
Pinout & Package
ADR391BUJZ-REEL7 uses a 5-lead TSOT package (UJ suffix), 1.6 mm × 1.6 mm × 0.55 mm, with exposed pad for thermal enhancement (θJA = 230°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Low-impedance return path for internal bandgap core and output stage; must be connected to clean analog ground plane. |
| 2 - SHDN | Shutdown control input | TTL/CMOS-compatible digital input; ≤0.8 V disables output (high-Z), ≥2.4 V enables regulation; requires pull-up to VIN if unused. |
| 3 - VOUT (SENSE) | Feedback sense node | Kelvin connection point for remote sensing; rejects PCB trace resistance and ground bounce to maintain output accuracy under load. |
| 4 - VOUT (FORCE) | Output force node | Delivers regulated 2.5 V to load; used with SENSE for 4-wire regulation or as standalone output when SENSE is tied locally. |
| 5 - VIN | Power input | Accepts 2.8 V–15 V supply; internal LDO structure provides regulation with only 300 mV headroom above VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow output noise | 5 μVp-p (0.1 Hz–10 Hz) - minimizes quantization uncertainty in 24-bit delta-sigma ADCs and precision weigh-scale systems. |
| No external capacitor required | Stable with 0–10 μF capacitive loads - eliminates BOM cost and board area for bypass caps in wearables and implantables. |
| Dual-output topology | VOUT(FORCE)/VOUT(SENSE) separation - enables true 4-wire reference regulation, eliminating errors from PCB resistance and improving long-term stability. |
| Automotive-grade qualification | Rated for −40°C to +125°C operation - meets AEC-Q100 stress test requirements for engine control and ADAS sensor modules. |
| Micropower shutdown | 3 μA max shutdown current - allows integration into wake-on-event architectures where reference remains off >99% of system uptime. |
Applications
| Battery-Powered Instrumentation | Portable Medical Instrumentation |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers operating from single 3.7 V Li-ion cells with 10+ hour runtime. IC Role / Device Role / Timing Role: Primary 2.5 V reference for 16-bit SAR ADC and analog front-end amplifiers. Use Value: 9 ppm/°C TC and 5 μVp-p noise ensure <0.01% measurement repeatability across temperature and battery discharge cycles. | Use Scenario: Wearable ECG monitors with continuous 24/7 biosignal acquisition and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Stable reference for ultra-low-power analog signal conditioning and ADC sampling clock generation. Use Value: 3 μA shutdown current enables sleep-mode power budgeting below 1 μA, extending coin-cell life to >3 years. |
| Data Acquisition Systems | Industrial Process Controls |
Use Scenario: Isolated 8-channel 24-bit DAQ modules for factory-floor vibration monitoring and predictive maintenance. IC Role / Device Role / Timing Role: Local reference per channel to eliminate crosstalk and common-mode drift in isolated sigma-delta ADCs. Use Value: Dual-force/sense outputs reject ground loop errors, maintaining 120 dB CMRR even with 100 mΩ PCB trace resistance. | Use Scenario: Loop-powered 4–20 mA transmitters in hazardous environments with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Precision 2.5 V reference for DAC-based current loop control and HART modulation circuitry. Use Value: 140 μA operating current and 300 mV dropout allow full functionality within 3.3 V headroom constraints of 24 V loop supplies. |
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 20 ppm/°C TC (A grade), 9 μVp-p noise, and 180 μA quiescent current. | Lacks shutdown pin; not suitable for duty-cycled systems requiring sub-μA sleep. | Select when lowest possible cost is prioritized over noise and shutdown capability. |
| REF3325AIDBVR | 2.5 V output, 10 ppm/°C TC, 10 μVp-p noise, 8.5 μA typical quiescent current, no shutdown. | Higher noise and no shutdown; smaller SOT-23-3 package but no sense/force separation. | Select when board space is critical and 4-wire sensing is unnecessary. |
Compared with ADR3425ARMZ-R7 and REF3325AIDBVR, the ADR391BUJZ-REEL7 uniquely combines ultralow noise (5 μVp-p), integrated shutdown (3 μA), and force/sense topology - making it the only option among the three that supports both high-precision measurement and energy-efficient intermittent operation in compact industrial sensors.
Availability
ADR391BUJZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical instrumentation, and data acquisition systems requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability.
Supply support for ADR391BUJZ-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 product line was engineered specifically for micropower, low-noise precision voltage referencing in size- and energy-constrained applications - emphasizing zero-compromise performance in TSOT packaging for portable and automotive systems.
FAQ
What is the maximum load current supported by the ADR391BUJZ-REEL7?
The ADR391BUJZ-REEL7 supports up to 5 mA of continuous output current while maintaining specified accuracy and stability. This rating applies across the full −40°C to +125°C temperature range with VIN ≥ VO + 300 mV. Exceeding 5 mA may degrade load regulation (140 ppm/mA) and increase output drift; for higher currents, external buffering with a series pass transistor is recommended per Figure 41 in the datasheet.
Does the ADR391BUJZ-REEL7 require an external output capacitor?
No, the ADR391BUJZ-REEL7 is internally compensated and stable with 0 μF to 10 μF capacitive loads - eliminating the need for external output capacitors. A 0.1 μF ceramic capacitor is recommended at the VOUT(FORCE) pin to improve transient response under dynamic loads, but it is not required for stability. This simplifies layout and reduces BOM count in space-sensitive designs.
How does the dual-output (FORCE/SENSE) architecture improve accuracy in the ADR391BUJZ-REEL7?
The ADR391BUJZ-REEL7's separate VOUT(FORCE) and VOUT(SENSE) pins enable true 4-wire (Kelvin) sensing: SENSE connects directly to the load's reference point, rejecting voltage drop across PCB traces and contact resistance. This maintains ±4 mV initial accuracy and 9 ppm/°C TC at the load, even with 100 mΩ path resistance - critical for high-precision ADCs and metrology-grade instruments.
What is the shutdown behavior of the ADR391BUJZ-REEL7, and how should the SHDN pin be configured?
Applying ≤0.8 V to the SHDN pin places the ADR391BUJZ-REEL7 in shutdown mode, disabling the output (high-impedance state) and reducing supply current to ≤3 μA. If shutdown is unused, SHDN must be tied to VIN. During power-up with SHDN held low, a ≥200 ms VIN ramp rate or RC filter (10 kΩ + 10 μF) on VIN is required to prevent latch-up, per Figure 36 in the datasheet.
Is the ADR391BUJZ-REEL7 qualified for automotive applications?
Yes, the ADR391BUJZ-REEL7 is rated for operation from −40°C to +125°C and is explicitly designated as automotive grade in the datasheet. It meets the environmental stress requirements for under-hood and cabin electronics, including thermal cycling, humidity, and vibration robustness - though formal AEC-Q100 certification status must be confirmed via Analog Devices' official product change notices.
ADR391BUJZ-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:
- ±0.16%
- Temperature Coefficient:
- 9ppm/°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
ADR391BUJZ-REEL7 FAQ
1.How can I place an order for ADR391BUJZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR391BUJZ-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 ADR391BUJZ-REEL7 reliable?
The price and inventory of ADR391BUJZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR391BUJZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR391BUJZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR391BUJZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR391BUJZ-REEL7?
ADR391BUJZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR391BUJZ-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 ADR391BUJZ-REEL7?
For technical support, including ADR391BUJZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR391BUJZ-REEL7 requirements.
6.How does Aetrix verify that ADR391BUJZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR391BUJZ-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 ADR391BUJZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR391BUJZ-REEL7?
All ADR391BUJZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR391BUJZ-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 ADR391BUJZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR391BUJZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADR391BUJZ-REEL7 Tags
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