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Analog Devices Inc. ADR425ARZ
- Part No.:
- ADR425ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADR425ARZ.pdf
- Description:
- IC VREF SERIES 0.12% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:541
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Product details
Overview
ADR425ARZ from Analog Devices is an ultraprecision XFET® voltage reference delivering a stable 5.000 V output with ±2 mV (B grade) initial accuracy, 3 ppm/°C max temperature coefficient, 3.4 μV p-p (0.1 Hz to 10 Hz) low-frequency noise, and 10 mA output current capability - used in high-resolution ADC/DAC biasing, optical network control circuits, and portable medical instrumentation requiring sub-ppm stability.
For engineers reviewing the ADR425ARZ datasheet, ADR425ARZ pinout, ADR425ARZ application, or ADR425ARZ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The ADR425ARZ employs patented XFET® architecture - a second-generation eXtra implanted junction FET topology - which generates a ~0.5 V intrinsic reference with −120 ppm/°C TC, then applies precision PTAT current-based curvature correction to achieve <3 ppm/°C over −40°C to +125°C. This eliminates the high-noise bandgap compensation circuitry found in conventional references.
It operates with 7 V to 18 V input supply, maintains 70 ppm/mA load regulation and 35 ppm/V line regulation across full temperature range, and supports ±0.5% output adjustment via the TRIM pin without degrading TC or long-term stability - enabling system-level calibration without sacrificing reference-grade performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V (B grade: ±2 mV at 25°C); enables direct interface with 5 V ADCs/DACs without gain scaling. |
| Temp Coefficient | ≤3 ppm/°C (B grade, −40°C to +125°C); ensures <±0.375 mV drift over full industrial range - critical for uncalibrated field instruments. |
| Voltage Noise | 3.4 μV p-p (0.1 Hz–10 Hz); contributes <0.001 LSB error in 24-bit, 5 V FS converters sampling at ≤10 SPS. |
| Long-Term Stability | 50 ppm / 1000 hours; guarantees <±0.25 mV output shift after 42 days of continuous operation at 125°C - essential for sealed medical devices. |
| Load Regulation | 70 ppm/mA; introduces only ±0.35 mV error when sourcing full 10 mA - sufficient for driving multiple op-amp references or SAR ADC references. |
| Supply Headroom | 2 V min (VIN ≥ 7 V); allows use with 9 V batteries or 7.5 V LDOs while maintaining regulation under load and temperature extremes. |
| Quiescent Current | ≤500 µA (25°C); enables >1-year battery life in 10 µA sleep-cycle portable instruments with periodic 5 V reference activation. |
Pinout & Package
ADR425ARZ is available in 8-lead SOIC (R package) and 8-lead MSOP (RM package), both RoHS-compliant and rated for −40°C to +125°C operation. Pinout is identical across packages and shared with ADR420/421/423 family members.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 TP | Factory test pin | Internally connected but reserved for production testing; must remain unconnected in end equipment to avoid malfunction. |
| 2 VIN | Reference input supply | Accepts 7 V–18 V; requires ≥2 V headroom above VOUT; no input capacitor required but 1 µF improves transient response. |
| 3, 7 NIC | No internal connection | Electrically floating; may be left open or tied to GND for mechanical stability - no electrical impact. |
| 4 GND | Analog ground reference | Must connect to clean, low-impedance analog ground plane; separates reference return from digital or power grounds. |
| 5 TRIM | Output voltage adjustment | Enables ±0.5% fine-tuning (±25 mV at 5 V) using external resistor divider; does not affect tempco or long-term drift. |
| 6 VOUT | Precision 5.000 V output | Capable of sourcing 10 mA; 0.1 µF bypass to GND reduces broadband noise; larger caps improve load transients but increase turn-on time. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® reference architecture | Delivers lower thermal hysteresis (40 ppm typical) and 3× lower noise than bandgap references - critical for metrology-grade repeatability. |
| Patented TC curvature correction | Reduces residual nonlinearity across −40°C to +125°C, enabling single-point calibration in wide-temperature industrial sensors. |
| Trim-adjustable output | Supports system-level calibration without trimming external resistors - preserves factory accuracy while accommodating PCB layout tolerances. |
| High PSRR (−75 dB @ 1 kHz) | Rejects switching regulator ripple and digital supply noise, eliminating need for additional LDO filtering in mixed-signal systems. |
| Low quiescent current (≤500 µA) | Minimizes self-heating (<0.5°C at 125°C ambient), preserving TC spec and enabling use in thermally constrained enclosures. |
Applications
| Optical Network Control Circuits | Precision Data Acquisition Systems |
|---|---|
|
Use Scenario: Biasing laser diode drivers and monitoring photodiode transimpedance amplifiers in DWDM transceivers operating across −5°C to +70°C ambient. IC Role / Device Role / Timing Role: Provides stable 5.000 V reference for DAC-controlled current sources and ADC digitization of optical power feedback loops. Use Value: 3 ppm/°C TC and 3.4 μV p-p noise ensure <±0.005 dB optical power control resolution over temperature - meeting GR-468 reliability requirements. |
Use Scenario: Serving as master reference for 24-bit delta-sigma ADCs in portable dissolved oxygen and pH meters powered by coin-cell batteries. IC Role / Device Role / Timing Role: Supplies excitation voltage for precision ratiometric sensor bridges and reference voltage for ADC conversion. Use Value: 50 ppm/1000 hrs long-term stability and ≤500 µA quiescent current enable >2-year calibration interval and multi-year battery life. |
| Industrial Process Control Systems | Portable Medical Instruments |
|
Use Scenario: Calibrating 4–20 mA loop-powered transmitters in refinery analyzers exposed to −40°C cold starts and +85°C cabinet temperatures. IC Role / Device Role / Timing Role: Generates precise 5.000 V reference for programmable gain instrumentation amplifiers and voltage-to-current converters. Use Value: 7 V minimum VIN and 10 mA drive capability allow direct integration into loop-powered designs without auxiliary supplies. |
Use Scenario: Providing reference voltage for ECG front-end ADCs and pulse oximeter LED current control in handheld patient monitors. IC Role / Device Role / Timing Role: Delivers ultra-low-noise, low-drift reference for analog signal conditioning prior to digitization. Use Value: 3.4 μV p-p (0.1–10 Hz) noise prevents baseline wander artifacts in sub-1 µV ECG signals; SOIC package supports automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5050IDR | 5.0 V output, 3 ppm/°C TC, 4.5 μV p-p noise, 10 mA drive, but requires ≥7.5 V VIN and has higher 1/f noise density (120 nV/√Hz @ 1 kHz). | Less suitable for battery-powered systems due to higher minimum supply and greater low-frequency noise impact on DC-coupled biosignals. | Prefer ADR425ARZ where 0.1–10 Hz noise dominates error budget (e.g., ECG, strain gauge bridges); REF5050IDR acceptable where wideband noise matters more. |
| LT6655IMS5-5#TRPBF | 5.0 V output, 3 ppm/°C TC, 2.5 μV p-p noise, 10 mA drive, but uses buried Zener core - higher quiescent current (1.1 mA) and narrower temp range (−40°C to +125°C same). | Higher power dissipation limits use in thermally isolated enclosures; superior noise makes it viable for ultra-low-noise lab equipment. | Choose LT6655IMS5-5#TRPBF only when absolute lowest 0.1–10 Hz noise is mandatory and supply current is not constrained; ADR425ARZ preferred for portable/battery systems. |
Compared with REF5050IDR and LT6655IMS5-5#TRPBF, the ADR425ARZ uniquely balances ultralow 0.1–10 Hz noise (3.4 μV p-p), minimal quiescent current (≤500 µA), and robust 7–18 V operation - making it the optimal choice for portable, battery-powered, and thermally sensitive precision measurement systems.
Availability
ADR425ARZ is available at Aetrix Electronics and suitable for precision data acquisition systems, optical network control circuits, and portable medical instruments requiring stable component supply, long-term calibration integrity, and guaranteed industrial temperature performance.
Supply support for ADR425ARZ 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 R&D and manufacturing operations worldwide.
The ADR42x series was designed specifically for ultraprecision DC measurement systems demanding sub-ppm stability, low 1/f noise, and exceptional thermal hysteresis - targeting high-end test equipment, medical diagnostics, and industrial process control.
FAQ
What is the maximum load current supported by the ADR425ARZ?
The ADR425ARZ is specified to source up to 10 mA continuously while maintaining all key specifications including output voltage accuracy, temperature coefficient, and noise performance. It can deliver short-duration peak currents beyond 10 mA, but sustained loads above this level may increase self-heating and degrade long-term stability or TC performance. For reliable 10 mA operation across −40°C to +125°C, ensure adequate PCB copper area and verify junction temperature using θJA = 130°C/W (SOIC) or 190°C/W (MSOP).
Can the ADR425ARZ operate from a 5 V supply?
No - the ADR425ARZ requires a minimum supply voltage of 7 V, as specified in its Absolute Maximum Ratings and Electrical Specifications tables. Attempting to power it from 5 V will result in loss of regulation and unpredictable output behavior. This 2 V minimum headroom (VIN − VOUT) is inherent to the XFET® architecture and cannot be reduced via external components. Use ADR421ARZ (2.5 V, 4.5 V min VIN) or ADR423ARZ (3.0 V, 5 V min VIN) for lower-supply applications.
How does the TRIM pin function on the ADR425ARZ?
The TRIM pin on the ADR425ARZ allows adjustment of the output voltage over a ±0.5% range (±25 mV around 5.000 V) using an external resistor divider connected between VOUT, TRIM, and GND. This adjustment does not compromise temperature coefficient, long-term stability, or noise performance. The TRIM terminal draws negligible current (<100 nA), so standard 1% metal-film resistors are sufficient for calibration. Do not leave TRIM floating - tie to GND or configure as intended.
Is an output capacitor required for stability with the ADR425ARZ?
No - the ADR425ARZ is internally compensated and remains stable with any capacitive load, including 0 µF. A 0.1 µF ceramic capacitor from VOUT to GND is recommended to reduce broadband noise, while larger values (1–10 µF) improve load transient response. However, adding capacitance increases turn-on settling time proportionally; for applications requiring fast wake-up (e.g., duty-cycled sensors), keep output capacitance ≤0.1 µF and verify tR < 10 µs in-system.
What is the difference between ADR425ARZ and ADR425BRZ?
The ADR425ARZ and ADR425BRZ share identical pinout, package, and functional specifications, differing only in initial output voltage accuracy: A-grade units have ±6 mV (±0.12%) tolerance, while B-grade units are tighter at ±2 mV (±0.04%). Both grades guarantee the same 3 ppm/°C max temperature coefficient, 3.4 μV p-p noise, and 50 ppm/1000 hrs long-term stability. Select ADR425BRZ when system-level calibration margin is limited or when minimizing post-assembly trimming effort is critical.
ADR425ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- XFET®
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 10ppm/°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
ADR425ARZ FAQ
1.How can I place an order for ADR425ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR425ARZ 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 ADR425ARZ reliable?
The price and inventory of ADR425ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR425ARZ is usually 5 days.
3.What payment methods are accepted for ADR425ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR425ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR425ARZ?
ADR425ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR425ARZ 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 ADR425ARZ?
For technical support, including ADR425ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR425ARZ requirements.
6.How does Aetrix verify that ADR425ARZ is sourced from the original manufacturer or authorized distributors?
All ADR425ARZ 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 ADR425ARZ meets industry standards.
7.What is the process for return or replacement of ADR425ARZ?
All ADR425ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADR425ARZ, 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 ADR425ARZ part is unused and in its original packaging.
Return procedure for ADR425ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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