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Analog Devices Inc. ADR421BR-REEL7
- Part No.:
- ADR421BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADR421BR-REEL7.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,240
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Product details
Overview
ADR421BR-REEL7 from Analog Devices is an ultraprecision XFET® voltage reference delivering 2.500 V output with ±1 mV (±0.04%) initial accuracy, 3 ppm/°C max temperature coefficient, and 1.75 µV p-p (0.1 Hz to 10 Hz) low-frequency noise. It operates from 4.5 V to 18 V supply, supports 10 mA output current, and is rated for −40°C to +125°C industrial temperature range - ideal for high-resolution ADC/DAC biasing in portable medical instruments.
For engineers reviewing the ADR421BR-REEL7 datasheet, ADR421BR-REEL7 pinout, ADR421BR-REEL7 application, or ADR421BR-REEL7 equivalent, this page provides verified specifications, SOIC-8 and MSOP-8 package details, trim-adjustable output functionality, and validated alternatives for precision analog signal chains requiring stable, low-noise reference voltage sources.
Technical Context
The ADR421BR-REEL7 implements second-generation XFET® architecture, using two matched JFETs-one with extra channel implant-to generate a ~0.5 V intrinsic reference with −120 ppm/°C TC, then applying PTAT-based curvature correction to achieve <3 ppm/°C total drift over −40°C to +125°C. Its core topology eliminates buried Zener's high headroom and bandgap's noise-intensive compensation circuitry.
It features a dedicated TRIM pin enabling ±0.5% output adjustment without degrading temperature coefficient or long-term stability, and includes two factory-test pins (TP) and two no-connect terminals (NIC) - all confirmed in the 8-lead SOIC/MSOP footprint. Quiescent current remains ≤500 µA across temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±1 mV (B-grade); enables direct interface with 2.5 V full-scale SAR ADCs and DACs without scaling. |
| Initial Accuracy | ±0.04% (±1 mV); reduces system calibration burden in portable instrumentation and optical network control circuits. |
| Temp. Coefficient | 3 ppm/°C max (−40°C to +125°C); ensures <±90 ppm drift over full range - critical for unheated industrial sensor front-ends. |
| Voltage Noise | 1.75 µV p-p (0.1–10 Hz); supports 20+ bit resolution in precision data acquisition systems without external filtering. |
| Load Regulation | 70 ppm/mA; maintains stability under dynamic loads up to 10 mA - sufficient for driving ADC reference inputs and op-amp bias networks. |
| Line Regulation | 35 ppm/V; rejects supply ripple in battery-powered systems where input voltage varies from 4.5 V to 18 V. |
| Long-Term Stability | 50 ppm / 1000 hours; ensures minimal drift in deployed medical devices and process controllers over multi-year service life. |
Pinout & Package
ADR421BR-REEL7 is available in 8-lead SOIC (R) and 8-lead MSOP (RM) packages, both RoHS-compliant and tape-and-reel packaged as -REEL7. Thermal resistance is θJA = 130°C/W (SOIC) or 190°C/W (MSOP), with θJC = 43°C/W and 44°C/W respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | TP (Test Pin) | Factory test access only; no user connection permitted - floating or loaded operation risks functional failure. |
| 2 | VIN | Input supply terminal; requires ≥2 V headroom above VOUT (i.e., ≥4.5 V min) for regulation. |
| 3, 7 | NIC (No Internal Connection) | Unbonded die pads; electrically isolated - must remain unconnected per datasheet. |
| 4 | GND | Analog ground reference; must be low-impedance, star-connected to minimize noise coupling into VOUT. |
| 5 | TRIM | Adjustment node; ±0.5% output tuning via external resistor divider without affecting TC or stability. |
| 6 | VOUT | Regulated 2.500 V output; capable of sourcing 10 mA; bypassed with 0.1 µF ceramic capacitor for optimal noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Architecture | Delivers lower thermal hysteresis (40 ppm typical) and superior long-term stability vs. bandgap or buried Zener references. |
| Trim-Adjustable Output | ±0.5% fine-tuning via external resistors on TRIM pin preserves initial accuracy, TC, and noise performance. |
| Ultra-Low 0.1–10 Hz Noise | 1.75 µV p-p enables DC-coupled, high-dynamic-range measurements in portable medical instruments and precision instruments. |
| Wide Supply Range & Low IQ | Operates from 4.5 V to 18 V with ≤500 µA quiescent current - suitable for dual-supply industrial systems and battery-backed designs. |
| Extended Temperature Rating | Specified from −40°C to +125°C with guaranteed performance - supports deployment in automotive engine compartments and industrial PLCs. |
Applications
| Precision Data Acquisition Systems | High-Resolution Converters |
|---|---|
Use Scenario: 24-bit delta-sigma ADC front-end in portable environmental monitoring equipment powered by Li-ion battery. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and PGA gain-setting network. Use Value: 1.75 µV p-p noise and 3 ppm/°C TC ensure <1 LSB error across temperature and battery discharge cycle. |
Use Scenario: Dual-channel 18-bit SAR ADC in optical network transceiver module with tight power budget. IC Role / Device Role / Timing Role: Precision 2.5 V reference for ADC and DAC used in closed-loop laser bias control. Use Value: ±0.04% initial accuracy eliminates per-unit calibration; 10 mA drive capability supports multiple converter reference inputs. |
| Battery-Powered Instrumentation | Industrial Process Control Systems |
Use Scenario: Handheld multimeter with autoranging and true RMS measurement. IC Role / Device Role / Timing Role: Stable reference for internal ADC and analog front-end scaling circuits. Use Value: 50 ppm/1000 hrs long-term stability ensures calibration validity over 12-month field service intervals. |
Use Scenario: 4–20 mA transmitter with HART communication in chemical plant sensor node. IC Role / Device Role / Timing Role: Reference for precision current source and diagnostic ADC. Use Value: −40°C to +125°C rating and 70 ppm/mA load regulation maintain accuracy despite ambient swings and loop current transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5 V, 3 ppm/°C max, 1.6 µV p-p noise, but higher 950 µA IQ and 3.6 V min VIN. | Less suitable for battery-powered designs with <4.5 V supply; better for fixed-rail industrial systems with ample headroom. | Select REF5025IDR when ultra-low noise is prioritized over supply flexibility and quiescent current. |
| ADR441ARMZ-REEL7 | 2.5 V, 1.5 ppm/°C max, 1.2 µV p-p noise, 750 µA IQ, 3.3 V min VIN - higher grade, higher cost. | Used in metrology-grade instruments where <2 ppm/°C drift is mandatory; not cost-optimized for general industrial use. | Choose ADR441ARMZ-REEL7 only when ADR421BR-REEL7's 3 ppm/°C spec fails system-level drift budget. |
Compared with REF5025IDR and ADR441ARMZ-REEL7, the ADR421BR-REEL7 delivers optimal balance of low noise, wide supply range, and low IQ for portable and industrial converters - offering 30% lower quiescent current than REF5025IDR and 2× cost advantage over ADR441ARMZ-REEL7 without sacrificing key performance metrics.
Availability
ADR421BR-REEL7 is available at Aetrix Electronics and suitable for precision data acquisition systems, high-resolution converters, and battery-powered instrumentation requiring stable component supply with full traceability and extended lifecycle support.
Supply support for ADR421BR-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 ADR42x series was designed specifically for ultraprecision voltage reference applications in high-end test equipment, medical imaging, and optical networking - emphasizing XFET® technology for low noise, low drift, and robust thermal behavior.
FAQ
What is the maximum load current supported by the ADR421BR-REEL7?
The ADR421BR-REEL7 is specified to deliver up to 10 mA of output current while maintaining all electrical parameters within datasheet limits. At full 10 mA load, output voltage deviation remains ≤70 ppm/mA, and thermal rise stays within safe junction limits when mounted on standard PCB copper area. This makes ADR421BR-REEL7 suitable for driving multiple precision op-amps or reference inputs simultaneously.
Can the ADR421BR-REEL7 operate from a 3.3 V supply?
No - the ADR421BR-REEL7 requires a minimum supply voltage of 4.5 V due to its 2 V minimum headroom specification (VIN − VOUT ≥ 2 V). Attempting to operate from 3.3 V will result in loss of regulation and unpredictable output behavior. For 3.3 V systems, consider the ADR441 series or REF5025 with 3.3 V compatible headroom.
Does the ADR421BR-REEL7 require an output capacitor for stability?
No, the ADR421BR-REEL7 is internally compensated and remains stable without any output capacitor under all load conditions. A 0.1 µF ceramic capacitor is recommended solely for noise reduction - it does not affect stability but improves 0.1–10 Hz noise by filtering high-frequency supply coupling. Larger capacitors (>1 µF) improve load transient response but increase turn-on settling time.
How is the TRIM pin used on the ADR421BR-REEL7?
The TRIM pin on ADR421BR-REEL7 allows ±0.5% adjustment of the 2.500 V output using an external resistor divider between VOUT and GND, with the wiper connected to TRIM. This tuning does not degrade temperature coefficient, long-term stability, or noise - verified across production lots. The adjustment range is linear and monotonic, supporting final-system calibration without rework.
What is the difference between ADR421BRZ and ADR421BR-REEL7?
ADR421BRZ is the same die and specification as ADR421BR-REEL7 but supplied in tube packaging (non-reel), whereas ADR421BR-REEL7 is supplied on 7-inch tape-and-reel (1000 units per reel) optimized for automated SMT assembly. Both share identical electrical performance, SOIC-8 package dimensions, and RoHS compliance - only packaging and ordering format differ.
ADR421BR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- XFET®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 3ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.75µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 18V
- Current - Supply:
- 600µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADR421BR-REEL7 FAQ
1.How can I place an order for ADR421BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR421BR-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 ADR421BR-REEL7 reliable?
The price and inventory of ADR421BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR421BR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR421BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR421BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR421BR-REEL7?
ADR421BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR421BR-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 ADR421BR-REEL7?
For technical support, including ADR421BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR421BR-REEL7 requirements.
6.How does Aetrix verify that ADR421BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR421BR-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 ADR421BR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR421BR-REEL7?
All ADR421BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR421BR-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 ADR421BR-REEL7 part is unused and in its original packaging.
Return procedure for ADR421BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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