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Analog Devices Inc. ADR125AUJZ-R2
- Part No.:
- ADR125AUJZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
ADR125AUJZ-R2.pdf
- Description:
- IC VREF SERIES 0.24% TSOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,353
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Product details
Overview
ADR125AUJZ-R2 from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 5.0 V output with ±0.24% initial accuracy (A grade), 25 ppm/°C max temperature coefficient, and 300 mV dropout at 5 mA load - designed for high-stability analog signal chains in space-constrained battery-powered systems.
For engineers reviewing the ADR125AUJZ-R2 datasheet, ADR125AUJZ-R2 pinout, ADR125AUJZ-R2 application, or ADR125AUJZ-R2 equivalent, this page provides verified electrical specifications, TSOT-6 package layout, real-world use cases in portable medical and automotive sensing, and validated alternative parts with documented functional and parametric differences.
Technical Context
The ADR125AUJZ-R2 implements a curvature-corrected band gap reference architecture enabling ultra-low thermal drift across −40°C to +125°C. It operates as a two-quadrant device capable of sourcing up to +5 mA and sinking up to −2 mA while maintaining 35–200 ppm/mA load regulation.
Its 85 μA typical quiescent current, 900 nV/√Hz wideband noise, and 36 μV p-p 0.1 Hz–10 Hz noise support high-resolution data acquisition where supply headroom and long-term stability are critical. Input voltage range is 5.3 V to 18 V, with PSRR of −90 dB at 60 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V nominal; B-grade tolerance ±0.12%, A-grade ±0.24% - enables direct replacement of legacy 5 V references without recalibration. |
| Temperature Coefficient | Max 25 ppm/°C (A grade); ensures ≤±125 ppm total drift over −40°C to +125°C - suitable for unheated automotive cabin modules. |
| Dropout Voltage | 300 mV at 5 mA load; allows stable 5 V output from as low as 5.3 V input - ideal for single-cell LiFePO₄ or dual-cell alkaline systems. |
| Quiescent Current | 80–95 μA across input range; enables >10-year battery life in 10 μA sleep-mode instrumentation nodes. |
| Load Regulation | 35–200 ppm/mA sourcing; maintains <±1 mV error across full 5 mA load swing - supports ADC biasing and sensor excitation simultaneously. |
| Noise (0.1–10 Hz) | 36 μV p-p; contributes <0.0007% error to 16-bit ADC full-scale - eliminates need for external filtering in precision weigh scales. |
| PSRR | −90 dB at 60 Hz; rejects line-frequency interference in industrial PLC analog inputs without additional LDO staging. |
Pinout & Package
ADR125AUJZ-R2 is housed in a 6-lead TSOT (UJ-6) package measuring 2.90 mm × 1.60 mm × 0.95 mm (max height), optimized for automated assembly and thermal performance (θJA = 230°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Must be left floating; no internal connection - PCB pad may be omitted or grounded only if confirmed by layout review. |
| 2 | Ground (GND) | Reference return path; requires low-impedance connection to system analog ground plane to minimize noise coupling. |
| 3 | Input Voltage (VIN) | Supplies operating power; accepts 5.3 V–18 V; input capacitor ≥0.1 μF recommended for transient immunity. |
| 4 | Output Voltage (VOUT) | Stable 5.0 V reference; requires 0.1 μF ceramic capacitor to ground for stability and load transient response. |
| 5 | No Connect (NC) | Must be left floating; internal test node - no routing or copper pour allowed on PCB. |
| 6 | No Connect (NC) | Must be left floating; no internal function - avoid solder mask opening or via placement. |
Key Features
| Feature | Design Value |
|---|---|
| Patented curvature correction | Reduces nonlinear VOUT vs. T error to <±125 ppm over full industrial temperature range - eliminates software calibration in field-deployed sensors. |
| Two-quadrant operation | Sources +5 mA / sinks −2 mA - enables direct driving of op-amp inputs, DAC references, and current-source loads without external buffers. |
| Low-noise design | 36 μV p-p (0.1–10 Hz) and 900 nV/√Hz (10 kHz) - meets noise floor requirements for 24-bit delta-sigma ADCs in portable ECG monitors. |
| Extended temperature range | Rated −40°C to +125°C - qualified for under-hood automotive applications and industrial motor control feedback circuits. |
| TSOT-6 footprint | Compatible with standard 0.5 mm pitch SMT reflow; 40 mW max power dissipation supports 5 mA loads at +125°C ambient. |
Applications
| Battery-Powered Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Handheld multimeter with auto-ranging 16-bit SAR ADC requiring stable 5 V reference across varying battery voltage (6–9 V) and temperature (0–40°C). IC Role / Device Role / Timing Role: Primary voltage reference for ADC and front-end signal conditioning; establishes absolute measurement accuracy baseline. Use Value: 300 mV dropout enables operation down to 5.3 V input; ±0.24% initial error and 25 ppm/°C TC ensure <0.05% total measurement uncertainty without factory recalibration. | Use Scenario: Portable pulse oximeter using transimpedance amplifier and 20-bit sigma-delta ADC for SpO₂ calculation. IC Role / Device Role / Timing Role: Precision 5 V reference for LED current control and ADC reference rail; critical for ratiometric photodiode signal processing. Use Value: 36 μV p-p low-frequency noise prevents saturation of DC-coupled amplifiers; 85 μA IQ extends AA battery life to >12 months in intermittent-use mode. |
| Data Acquisition Systems | Automotive |
Use Scenario: 8-channel isolated thermocouple/data logger with cold-junction compensation, operating from 12 V vehicle battery with engine-off drain constraints. IC Role / Device Role / Timing Role: Master reference for all channel ADCs and analog front-end gain stages; referenced against isolated 5 V digital supply. Use Value: −90 dB PSRR suppresses alternator ripple; 150 ppm/1000 hrs long-term stability ensures <0.1°C calibration drift over 5-year product lifetime. | Use Scenario: Engine control unit (ECU) subsystem monitoring rail voltage, coolant temperature, and knock sensor signals in under-hood environment. IC Role / Device Role / Timing Role: High-reliability 5 V reference for analog sensor interfaces and diagnostic ADCs exposed to thermal cycling and vibration. Use Value: Qualified to −40°C to +125°C with 25 ppm/°C TC ensures <±0.625 mV error across full operating range - meets AEC-Q100 Grade 1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR125BUJZ-R2 | Same package and pinout; improved ±0.12% initial accuracy and 9 ppm/°C TC (B grade). | Required where <±0.5 mV absolute error is mandated - e.g., metrology-grade calibrators or high-end medical imaging. | Select ADR125BUJZ-R2 when tighter initial tolerance and lower drift justify cost premium; otherwise ADR125AUJZ-R2 suffices for industrial DAQ. |
| REF5050AIDR | 5.0 V, ±0.05% initial accuracy, 3 ppm/°C TC, SOIC-8 package; higher IQ (950 μA), larger footprint. | Used in lab equipment and benchtop instruments where size is secondary to ultimate stability and noise performance. | Choose REF5050AIDR only when sub-ppm/°C drift and <10 μV p-p noise are mandatory; ADR125AUJZ-R2 offers better size/power tradeoff for portable designs. |
Compared with ADR125BUJZ-R2, the ADR125AUJZ-R2 trades 0.12% accuracy and 16 ppm/°C TC for lower cost and identical board layout; versus REF5050AIDR, it delivers 90% smaller footprint and 90% lower quiescent current at the expense of ultimate precision - making it optimal for volume portable electronics.
Availability
ADR125AUJZ-R2 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical equipment, and automotive sensor modules requiring stable component supply with guaranteed long-term continuity.
Supply support for ADR125AUJZ-R2 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 ADR12x family was engineered specifically for micropower, high-accuracy voltage referencing in space-constrained, battery-operated systems - emphasizing low dropout, ultra-low drift, and robustness across extended temperature ranges.
FAQ
What is the maximum input voltage rating for ADR125AUJZ-R2?
The ADR125AUJZ-R2 has an absolute maximum input voltage of 20 V relative to GND, per its Absolute Maximum Ratings table. For reliable operation, the recommended input range is 5.3 V to 18 V. Exceeding 20 V risks permanent damage, and operation above 18 V may exceed thermal limits depending on load and ambient conditions. Always verify power dissipation using θJA = 230°C/W when designing for high-VIN, high-load scenarios.
Does ADR125AUJZ-R2 require an input capacitor?
The ADR125AUJZ-R2 does not require an input capacitor for basic stability, but a 1 μF to 10 μF ceramic capacitor is recommended to improve transient response during sudden supply changes. Adding a parallel 0.1 μF capacitor further reduces high-frequency supply noise. These capacitors help maintain regulation during line transients - especially important in automotive or industrial environments with noisy 12 V rails.
Can ADR125AUJZ-R2 sink current, and how much?
Yes, the ADR125AUJZ-R2 is a two-quadrant reference capable of sinking up to −2 mA while maintaining specified accuracy and regulation. This capability enables direct interfacing with current-sinking loads such as LED bias circuits, certain DAC configurations, and op-amp inverting inputs - eliminating the need for external active circuitry in many precision analog designs.
What is the turn-on settling time specification for ADR125AUJZ-R2?
The ADR125AUJZ-R2 achieves 0.1% output accuracy within 100 μs when loaded with a 0.2 μF capacitor, as specified in its Electrical Characteristics table. This fast settling supports high-speed data acquisition systems where reference stabilization must align with ADC conversion timing - particularly in multiplexed multi-channel DAQ architectures requiring rapid channel switching and reference re-establishment.
Is ADR125AUJZ-R2 RoHS compliant and lead-free?
Yes, ADR125AUJZ-R2 is RoHS compliant and lead-free, indicated by the "Z" suffix in its ordering code per Analog Devices' Ordering Guide. It meets JEDEC standards MO-193-AA (excluding height/thickness) and is qualified for lead-free reflow soldering with peak temperatures up to 220°C for 15 seconds. Full compliance documentation is available in the manufacturer's official product change notices and material declarations.
ADR125AUJZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.24%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 36µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 5.3V ~ 18V
- Current - Supply:
- 95µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-6
ADR125AUJZ-R2 FAQ
1.How can I place an order for ADR125AUJZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR125AUJZ-R2 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 ADR125AUJZ-R2 reliable?
The price and inventory of ADR125AUJZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR125AUJZ-R2 is usually 5 days.
3.What payment methods are accepted for ADR125AUJZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR125AUJZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR125AUJZ-R2?
ADR125AUJZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR125AUJZ-R2 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 ADR125AUJZ-R2?
For technical support, including ADR125AUJZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR125AUJZ-R2 requirements.
6.How does Aetrix verify that ADR125AUJZ-R2 is sourced from the original manufacturer or authorized distributors?
All ADR125AUJZ-R2 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 ADR125AUJZ-R2 meets industry standards.
7.What is the process for return or replacement of ADR125AUJZ-R2?
All ADR125AUJZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with ADR125AUJZ-R2, 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 ADR125AUJZ-R2 part is unused and in its original packaging.
Return procedure for ADR125AUJZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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