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Analog Devices Inc. ADR421ARZ-REEL7
- Part No.:
- ADR421ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADR421ARZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.12% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,557
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Product details
Overview
ADR421ARZ-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 qualified for −40°C to +125°C industrial environments - ideal for high-resolution ADC/DAC biasing in portable medical instruments and optical network control circuits.
For engineers reviewing the ADR421ARZ-REEL7 datasheet, ADR421ARZ-REEL7 pinout, ADR421ARZ-REEL7 application, or ADR421ARZ-REEL7 equivalent, this page delivers verified specifications, SOIC-8 pin mapping, real-world use cases, and validated alternative options - all grounded in Analog Devices Rev. J datasheet data and official package documentation.
Technical Context
The ADR421ARZ-REEL7 implements second-generation XFET® architecture, using two matched JFETs - one with extra channel implant - to generate a stable ~0.5 V intrinsic reference with −120 ppm/°C TC, then applying PTAT-based curvature correction to achieve ≤3 ppm/°C over −40°C to +125°C. Its trim terminal enables ±0.5% output adjustment without degrading TC or long-term stability.
Unlike band gap references, the XFET core minimizes noise contribution from temperature compensation circuitry, enabling 1.75 µV p-p (0.1–10 Hz) and 80 nV/√Hz (1 kHz) noise performance. It requires no output capacitor for stability but accepts up to 10 µF for improved load transient response - with turn-on settling time of 10 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±1 mV (B-grade); enables precise 16-bit+ ADC full-scale calibration at room temperature. |
| Temp Coefficient | ≤3 ppm/°C (−40°C to +125°C); ensures <±30 ppm total drift across industrial temperature range. |
| Voltage Noise | 1.75 µV p-p (0.1–10 Hz); critical for sub-20-bit precision data acquisition systems with low-frequency signal integrity requirements. |
| Load Regulation | 70 ppm/mA; maintains output stability under dynamic 0–10 mA load changes typical in programmable DAC reference applications. |
| Quiescent Current | 500 µA max; supports battery-powered instrumentation with multi-year operating life on coin cells. |
| Long-Term Stability | 50 ppm / 1000 hours; reduces recalibration frequency in field-deployed test equipment and metrology tools. |
| Supply Headroom | 2 V min (VIN ≥ 4.5 V); allows operation from single Li-ion (4.2 V fully charged) with margin for voltage droop. |
Pinout & Package
ADR421ARZ-REEL7 is housed in an 8-lead SOIC package (JEDEC MS-012AA), RoHS-compliant, with standard 1.27 mm pitch and 5.0 mm × 6.2 mm footprint. Thermal resistance θJA = 130°C/W (board-mounted).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | TP (Test Pin) | Factory test connection; must remain unconnected in end application to prevent malfunction. |
| 2 | VIN | Input supply node; requires ≥4.5 V with ≥2 V headroom above VOUT for regulation. |
| 3, 7 | NIC (No Internal Connection) | Unbonded die pads; electrically floating - no PCB trace or copper pour required. |
| 4 | GND | Analog ground reference; must connect to low-impedance system ground plane for noise control. |
| 5 | TRIM | Adjustment node for ±0.5% VOUT tuning via external resistor divider; does not affect TC or stability. |
| 6 | VOUT | Regulated 2.500 V output; capable of sourcing/sinking up to ±10 mA with <70 ppm/mA load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Architecture | Delivers lower thermal hysteresis (40 ppm typical) and superior long-term stability vs. band gap or buried Zener alternatives. |
| Low 0.1–10 Hz Noise | 1.75 µV p-p enables high-fidelity DC-coupled measurements in precision weigh scales and EEG front-ends. |
| Trimmable Output | ±0.5% fine-tuning via external resistors preserves initial accuracy and temperature coefficient specifications. |
| Wide Temperature Range | Specified from −40°C to +125°C supports deployment in automotive engine control modules and industrial PLC I/O cards. |
| No Output Capacitor Required | Guaranteed stability with 0–10 µF output capacitance simplifies layout and eliminates phase-margin risk in space-constrained designs. |
Applications
| Portable Medical Instrumentation | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Battery-powered ECG monitor requiring stable 2.5 V reference for 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end gain stage and ADC conversion reference. Use Value: 1.75 µV p-p noise and 50 ppm/1000 hr stability ensure diagnostic-grade signal fidelity without periodic recalibration. |
Use Scenario: Industrial DAQ module digitizing strain gauge and RTD sensor outputs with 18+ ENOB. IC Role / Device Role / Timing Role: Precision reference for both excitation current source and ADC reference input. Use Value: 3 ppm/°C TC and 70 ppm/mA load regulation maintain measurement accuracy across ambient and self-heating variations. |
| Optical Network Control Circuits | High-Resolution Converters |
Use Scenario: Laser diode bias controller in 100G coherent transceivers needing ultra-stable current setpoint. IC Role / Device Role / Timing Role: Reference for precision current mirror generating laser bias current. Use Value: Low hysteresis (40 ppm) prevents output drift during thermal cycling between lab and field environments. |
Use Scenario: Calibration reference in automated test equipment (ATE) for 20-bit DAC linearity verification. IC Role / Device Role / Timing Role: Master reference for ratiometric DAC testing and offset/gain trimming. Use Value: ±1 mV initial accuracy and ±0.5% trim range enable factory calibration to <0.005% absolute error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR441ARMZ-REEL7 | Lower 0.9 ppm/°C max TC, higher 2.5 V initial accuracy (±0.25 mV), but 2× quiescent current (1.1 mA) and narrower VIN range (3.3–18 V). | Better for metrology-grade lab equipment where ultra-low drift dominates power budget; less suitable for battery operation. | Select ADR441ARMZ-REEL7 when TC <1 ppm/°C is mandatory and supply current >1 mA is acceptable. |
| REF5025AIDR | 2.5 V output, 3 ppm/°C TC, but higher 3.5 µV p-p noise (0.1–10 Hz) and no trim capability; SOIC-8 package. | Suitable for cost-sensitive industrial sensors where noise <2 µV p-p is not required and trim is unnecessary. | Choose REF5025AIDR for non-critical 16-bit systems where BOM cost reduction outweighs noise and adjustability trade-offs. |
Compared with ADR421ARZ-REEL7, ADR441ARMZ-REEL7 offers tighter TC and accuracy at higher power cost, while REF5025AIDR provides equivalent TC at higher noise and zero adjustability - making ADR421ARZ-REEL7 the optimal balance for portable, high-precision, field-deployable systems.
Availability
ADR421ARZ-REEL7 is available at Aetrix Electronics and suitable for precision data acquisition systems, portable medical instrumentation, and optical network control circuits requiring stable component supply with guaranteed long-term availability and traceable lot-level sourcing.
Supply support for ADR421ARZ-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, with design centers worldwide.
The ADR42x series was developed specifically for ultraprecision voltage reference applications demanding low noise, low drift, and high stability in compact SOIC/MSOP packages - targeting high-end test & measurement, medical, and communications infrastructure.
FAQ
What is the maximum load current supported by the ADR421ARZ-REEL7?
The ADR421ARZ-REEL7 is specified to deliver up to 10 mA output current while maintaining its key performance parameters, including 70 ppm/mA load regulation and 1.75 µV p-p noise. Sustained operation near 10 mA requires attention to thermal dissipation - with θJA = 130°C/W in SOIC, junction temperature rise remains within limits at ambient ≤85°C when VIN ≤12 V.
Does the ADR421ARZ-REEL7 require an output capacitor for stability?
No, the ADR421ARZ-REEL7 is internally compensated and remains stable with 0–10 µF output capacitance. A 0.1 µF ceramic capacitor is recommended for noise filtering, and adding 1–10 µF improves load transient response. Unlike many references, it does not oscillate or degrade PSRR when large output caps are used - though turn-on time increases proportionally with capacitance.
Can the output voltage of the ADR421ARZ-REEL7 be adjusted, and how?
Yes, the ADR421ARZ-REEL7 features a TRIM pin (Pin 5) that allows ±0.5% adjustment of the 2.500 V output using an external resistor divider. This tuning does not compromise temperature coefficient, long-term stability, or noise performance. The datasheet provides exact resistor calculation formulas and layout guidance to avoid introducing parasitic leakage paths.
What is the supply voltage range for the ADR421ARZ-REEL7?
The ADR421ARZ-REEL7 operates from 4.5 V to 18 V input supply. Minimum headroom is 2 V - meaning VIN must exceed VOUT (2.5 V) by at least 2 V, so 4.5 V is the absolute minimum. At VIN = 4.5 V, the device delivers full 10 mA load capability; higher VIN extends headroom margin for ripple rejection and transient immunity.
Is the ADR421ARZ-REEL7 suitable for automotive applications?
The ADR421ARZ-REEL7 is qualified for −40°C to +125°C operation and meets industrial reliability standards, but it is not AEC-Q200 qualified. It has been deployed in non-safety-critical automotive subsystems (e.g., infotainment sensor interfaces, body control modules), provided system-level qualification and board-level stress testing are performed. For ASIL-B/C applications, AEC-Q200-qualified alternatives should be selected.
ADR421ARZ-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:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 10ppm/°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
ADR421ARZ-REEL7 FAQ
1.How can I place an order for ADR421ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR421ARZ-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 ADR421ARZ-REEL7 reliable?
The price and inventory of ADR421ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR421ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR421ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR421ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR421ARZ-REEL7?
ADR421ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR421ARZ-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 ADR421ARZ-REEL7?
For technical support, including ADR421ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR421ARZ-REEL7 requirements.
6.How does Aetrix verify that ADR421ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR421ARZ-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 ADR421ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR421ARZ-REEL7?
All ADR421ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR421ARZ-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 ADR421ARZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR421ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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