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Analog Devices Inc. ADR425BR-REEL7
- Part No.:
- ADR425BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADR425BR-REEL7.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,838
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Product details
Overview
ADR425BR-REEL7 from Analog Devices is an ultraprecision XFET® voltage reference delivering a stable 5.000 V output with ±2 mV (±0.04%) initial accuracy, 3 ppm/°C max temperature coefficient, and 3.4 μV p-p (0.1 Hz to 10 Hz) low-frequency noise. It operates from 7 V to 18 V supply, supports 10 mA output current, and is used in high-resolution ADC/DAC biasing for optical network control circuits and portable medical instrumentation.
For engineers reviewing the ADR425BR-REEL7 datasheet, ADR425BR-REEL7 pinout, ADR425BR-REEL7 application, or ADR425BR-REEL7 equivalent, this page provides verified specifications, SOIC/MSOP package mapping, trim-adjustable output design guidance, and validated alternative options for precision analog signal chains requiring long-term stability and sub-5 μV noise performance.
Technical Context
The ADR425BR-REEL7 implements second-generation XFET architecture-using two matched JFETs with differential pinch-off voltage amplification-to generate a ~0.5 V intrinsic reference compensated by a PTAT current source. This yields inherently lower thermal hysteresis and reduced noise versus bandgap references.
Its trim terminal enables ±0.5% output adjustment without degrading temperature coefficient or long-term stability, while its 7 V minimum input headroom and 70 ppm/mA load regulation support robust operation across industrial temperature range (−40°C to +125°C) under varying load and line conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±2 mV (B grade); sets precise full-scale reference for 16–24-bit SAR and sigma-delta converters. |
| Temp Coefficient | 3 ppm/°C max (B grade); ensures ≤150 ppm drift over −40°C to +125°C ambient, critical for uncalibrated field instruments. |
| Voltage Noise | 3.4 μV p-p (0.1 Hz–10 Hz); enables <1 LSB error in 20-bit+ data acquisition systems without external filtering. |
| Long-Term Stability | 50 ppm / 1000 hours; guarantees minimal calibration drift in battery-powered medical devices operating continuously for >6 weeks. |
| Load Regulation | 70 ppm/mA; maintains output accuracy across 0–10 mA load variation, supporting direct drive of op-amp reference inputs and DACs. |
| Supply Range | 7 V to 18 V; accommodates wide-input industrial power rails while maintaining ≥2 V headroom for dropout margin. |
| Quiescent Current | 500 μA max; enables low-power operation in portable instrumentation with multi-year battery life at 10 μA sleep current. |
Pinout & Package
ADR425BR-REEL7 is available in 8-lead SOIC (R) and 8-lead MSOP (RM) packages-both RoHS-compliant, tape-and-reel formats. The SOIC variant measures 4.9 mm × 6.0 mm × 1.75 mm; MSOP is 3.0 mm × 3.0 mm × 0.85 mm. Pin numbering follows standard JEDEC top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | TP (Test Pin) | Factory test connection; must remain unconnected in circuit to prevent malfunction or parametric shift. |
| 2 | VIN | Main power input; requires ≥7 V supply with ≥2 V headroom above VOUT for guaranteed regulation. |
| 3, 7 | NIC (No Internal Connection) | Unbonded die pads; electrically floating-no PCB trace or copper pour should connect to these pins. |
| 4 | GND | Analog ground reference; must tie directly to low-impedance system ground plane with minimal trace length. |
| 5 | TRIM | Adjustment node for ±0.5% VOUT tuning via external resistor divider; does not affect tempco or stability. |
| 6 | VOUT | Regulated 5.000 V output; capable of sourcing up to 10 mA with <70 ppm/mA load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Architecture | Delivers 3× lower thermal hysteresis vs. bandgap references, enabling repeatable measurements after thermal cycling in field-deployed equipment. |
| Trim-Adjustable Output | Supports fine-tuning of VOUT over ±0.5% range using external resistors-enabling system-level calibration without trimming internal laser fuses. |
| Low 0.1–10 Hz Noise | 3.4 μV p-p noise floor allows direct interface to high-resolution delta-sigma ADCs without additional low-noise buffering stages. |
| Extended Temperature Range | Specified from −40°C to +125°C with full parameter guarantees-suitable for under-hood automotive sensors and industrial PLC modules. |
| No Output Capacitor Required | Stable with zero output capacitance; optional 0.1 µF ceramic cap reduces broadband noise without affecting settling time or loop stability. |
Applications
| Optical Network Control Circuits | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Biasing photodiode transimpedance amplifiers and laser diode drivers in DWDM transceivers operating at −5°C to +70°C ambient. IC Role / Device Role / Timing Role: Primary 5 V reference for 18-bit ADCs digitizing optical power feedback loops and temperature-compensated laser bias control. Use Value: 3 ppm/°C tempco and 3.4 μV p-p noise ensure <±0.01% gain stability across temperature, meeting GR-468 reliability requirements. |
Use Scenario: High-accuracy sensor front-end in portable gas analyzers with electrochemical and NDIR detectors. IC Role / Device Role / Timing Role: Stable reference for dual 24-bit sigma-delta ADCs measuring microvolt-level sensor outputs with 100 nV resolution. Use Value: 50 ppm/1000 hrs long-term stability eliminates need for field recalibration during 2-year product warranty period. |
| Battery-Powered Instrumentation | Industrial Process Control Systems |
Use Scenario: Handheld multimeter with autoranging, true RMS measurement, and 6.5-digit display powered by Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Precision 5 V reference for internal 20-bit DAC used in auto-zero and gain calibration routines. Use Value: 500 μA quiescent current extends battery life to >100 hours per charge while maintaining ±2 ppm/°C reference accuracy. |
Use Scenario: Loop-powered 4–20 mA transmitter with HART communication in chemical plant environments (−40°C to +85°C). IC Role / Device Role / Timing Role: Reference for 16-bit DAC generating analog output and for ADC monitoring supply rail and sensor diagnostics. Use Value: 7 V min input enables operation directly from 24 V loop supply with 17 V headroom-eliminating need for local LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR445ARMZ-REEL7 | Lower 0.8 ppm/°C max tempco, higher 5.5 μV p-p noise, 10 mA output, 7.5 V min input. | Better tempco but higher noise; suited for ultra-stable DC biasing where low-frequency noise is less critical than thermal drift. | Select ADR445 when system-level thermal cycling dominates noise budget; ADR425BR-REEL7 remains preferred for high-resolution AC-coupled measurement paths. |
| REF5050IDR | 5 V output, 3 ppm/°C max tempco, 4.5 μV p-p noise, 10 mA output, 5.4 V min input, SOIC-8. | Lower input headroom requirement; slightly higher noise; TI's REF50xx series offers better PSRR (−90 dB vs −75 dB) at 1 kHz. | Choose REF5050IDR if supply rail is constrained below 7 V; ADR425BR-REEL7 is optimal when lowest 0.1–10 Hz noise is mandatory and ≥7 V supply is available. |
Compared with ADR445ARMZ-REEL7 and REF5050IDR, the ADR425BR-REEL7 delivers the best balance of ultra-low 0.1–10 Hz noise (3.4 μV p-p), proven long-term stability (50 ppm/1000 hrs), and industrial-grade temperature performance-all in a widely supported SOIC/MSOP footprint.
Availability
ADR425BR-REEL7 is available at Aetrix Electronics and suitable for precision data acquisition systems, optical network control circuits, and battery-powered instrumentation requiring stable component supply with guaranteed long-term parametric consistency.
Supply support for ADR425BR-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 analog signal chains in test & measurement, medical imaging, and industrial automation-where XFET technology delivers superior noise, stability, and thermal behavior versus legacy bandgap or buried Zener references.
FAQ
What is the maximum load current supported by the ADR425BR-REEL7?
The ADR425BR-REEL7 is specified to deliver up to 10 mA of output current while maintaining all key parameters-including 70 ppm/mA load regulation and 3 ppm/°C temperature coefficient-across the full −40°C to +125°C operating range. Exceeding 10 mA may cause output voltage deviation beyond datasheet limits and increased self-heating effects.
Can the ADR425BR-REEL7 operate from a 5 V supply?
No. The ADR425BR-REEL7 requires a minimum supply voltage of 7 V to ensure proper regulation and specified performance. At 5 V input, the device will not regulate and VOUT will track VIN minus dropout-resulting in significant error and potential instability. Always maintain ≥2 V headroom above the 5.000 V output.
Is an output capacitor required for stability with the ADR425BR-REEL7?
No output capacitor is required for stability-the ADR425BR-REEL7 is unconditionally stable into capacitive loads up to 10 µF. A 0.1 µF ceramic capacitor is recommended at VOUT to GND to reduce broadband noise; larger values improve load transient response but increase turn-on settling time proportionally.
How does the TRIM pin on the ADR425BR-REEL7 function in practice?
The TRIM pin allows adjustment of the ADR425BR-REEL7 output voltage over a ±0.5% range (±25 mV around 5.000 V) using an external resistor divider. This is achieved by injecting or sinking current into TRIM-without altering temperature coefficient, long-term stability, or noise performance-as confirmed in the ADR42x datasheet Section "Output Adjustment".
What is the typical turn-on settling time for the ADR425BR-REEL7?
The ADR425BR-REEL7 has a typical turn-on settling time of 10 µs to reach final output voltage within the specified error band. This value is measured from VIN ramp-up to VOUT stabilization and includes both circuit settling and thermal gradient stabilization-critical for fast-sampling data acquisition systems requiring rapid channel switching.
ADR425BR-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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 3ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.4µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 7V ~ 18V
- Current - Supply:
- 600µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADR425BR-REEL7 FAQ
1.How can I place an order for ADR425BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR425BR-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 ADR425BR-REEL7 reliable?
The price and inventory of ADR425BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR425BR-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR425BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR425BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR425BR-REEL7?
ADR425BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR425BR-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 ADR425BR-REEL7?
For technical support, including ADR425BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR425BR-REEL7 requirements.
6.How does Aetrix verify that ADR425BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR425BR-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 ADR425BR-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR425BR-REEL7?
All ADR425BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR425BR-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 ADR425BR-REEL7 part is unused and in its original packaging.
Return procedure for ADR425BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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