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Analog Devices Inc. ADR127AUJZ-R2
- Part No.:
- ADR127AUJZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
ADR127AUJZ-R2.pdf
- Description:
- IC VREF SERIES 0.24% TSOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
ADR127AUJZ-R2 from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 1.25 V output with ±0.24% initial accuracy (A grade), 25 ppm/°C max temperature coefficient, and 1.45 V dropout at 0 mA load. It operates from 2.7 V to 18 V input, draws only 85 μA typical quiescent current, and is housed in a 6-lead TSOT (UJ-6) package for space-constrained battery-powered instrumentation.
For engineers reviewing the ADR127AUJZ-R2 datasheet, ADR127AUJZ-R2 pinout, ADR127AUJZ-R2 application, or ADR127AUJZ-R2 equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in portable medical and data acquisition systems, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The ADR127AUJZ-R2 implements a patented temperature-drift curvature correction technique to minimize nonlinearities in output voltage vs. temperature, achieving stable 1.25 V reference performance across −40°C to +125°C. Its series-mode band gap architecture provides both sink (−2 mA) and source (+5 mA) capability without external components.
Unlike standard shunt references, the ADR127AUJZ-R2 requires only a 0.1 μF output capacitor for stability and supports stacking configurations for arbitrary reference voltages. Its 9 μVp-p (0.1 Hz–10 Hz) and 300 nV/√Hz (10 kHz) noise performance enables high-resolution ADC biasing in precision measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V nominal; ±0.24% initial accuracy ensures ≤±3.0 mV absolute error at 25°C for calibration-critical circuits. |
| Temperature Coefficient | Max 25 ppm/°C (A grade); guarantees ≤±31.25 ppm drift over full −40°C to +125°C range, equivalent to ±39 μV total shift. |
| Dropout Voltage | 1.45 V at 0 mA load; defines minimum VIN = 2.70 V required for regulation-critical for single-cell Li-ion or 3.3 V rail operation. |
| Quiescent Current | 85 μA typical; enables >1-year battery life in 10 μA-sleep-mode portable devices with periodic 1.25 V reference activation. |
| Output Noise | 9 μVp-p (0.1 Hz–10 Hz); limits quantization uncertainty in 16-bit+ SAR ADCs when used as reference voltage source. |
| Load Current Range | +5 mA / −2 mA sourcing/sinking; supports direct driving of ADC reference inputs, op-amp bias networks, and trimming DACs. |
Pinout & Package
ADR127AUJZ-R2 is packaged in a 6-lead TSOT (UJ-6) surface-mount package with 0.95 mm pitch, 1.60 mm width, and 2.90 mm length per JEDEC MO-193-AA (height/thickness exceptions noted).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Must be left floating; no internal connection-tie to ground or leave unconnected per layout best practice. |
| 2 (GND) | Ground Reference | Primary return path for reference output and internal bandgap circuitry; requires low-impedance PCB plane connection. |
| 3 (VIN) | Input Supply | Accepts 2.7 V–18 V; must include ≥0.1 μF ceramic decoupling close to pin to suppress supply transients. |
| 4 (VOUT) | Reference Output | Delivers regulated 1.25 V; requires mandatory 0.1 μF ceramic capacitor to GND for stability and transient response. |
| 5 (NC) | No Connect | Must be left floating; electrically isolated-no routing or thermal pad connection recommended. |
| 6 (NC) | No Connect | Must be left floating; identical isolation status as Pin 1 and Pin 5-no internal function or thermal role. |
Key Features
| Feature | Design Value |
|---|---|
| Patented curvature correction | Reduces temperature-induced nonlinearity in VOUT vs. T curve, enabling <±0.5 mV deviation across −40°C to +125°C without external trimming. |
| Sink/source capability | Supports bidirectional load currents (−2 mA to +5 mA), eliminating need for external buffer op-amps in current-source or ratiometric sensor bias applications. |
| Low-noise architecture | 9 μVp-p (0.1 Hz–10 Hz) and 300 nV/√Hz (10 kHz) enable direct use in 24-bit delta-sigma ADC reference paths without additional filtering. |
| Extended temperature range | Rated for −40°C to +125°C operation, qualifying for under-hood automotive sensors and industrial field transmitters without derating. |
| Stackable configuration | Enables series connection of multiple ADR127AUJZ-R2 units to generate custom reference voltages (e.g., 2.5 V, 3.75 V) without precision resistors or trimming. |
Applications
| Battery-Powered Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers requiring stable 1.25 V reference for 16-bit ADC front-ends during intermittent battery operation. IC Role / Device Role / Timing Role: Precision voltage reference providing excitation and scaling for analog signal chains, directly interfacing with SAR ADC reference inputs. Use Value: 85 μA quiescent current extends AA/AAA battery life beyond 18 months in duty-cycled measurement modes while maintaining ±0.24% initial accuracy. | Use Scenario: Wearable ECG monitors needing ultra-low-noise, low-power reference for analog front-end gain stages and ADC biasing. IC Role / Device Role / Timing Role: Low-noise 1.25 V reference source for instrumentation amplifiers and 20-bit delta-sigma ADCs in biopotential signal conditioning paths. Use Value: 9 μVp-p (0.1 Hz–10 Hz) noise floor prevents degradation of microvolt-level ECG signal integrity during long-term patient monitoring. |
| Data Acquisition Systems | Automotive |
Use Scenario: Modular DAQ modules in industrial control cabinets where multiple channels share a common precision reference under varying ambient temperatures. IC Role / Device Role / Timing Role: Primary system reference for multi-channel simultaneous-sampling ADCs, supporting ratiometric sensor measurements and calibration routines. Use Value: 25 ppm/°C max tempco ensures <±0.3 mV drift over cabinet temperature swings (−25°C to +70°C), preserving channel-to-channel matching. | Use Scenario: Engine control unit (ECU) subsystems requiring robust reference voltage for oxygen sensor interface circuits operating near hot engine compartments. IC Role / Device Role / Timing Role: High-reliability voltage reference for wideband current sensing and thermistor biasing in ASIL-B compliant subsystems. Use Value: −40°C to +125°C rating and 150 ppm/1000 hrs long-term stability meet automotive qualification requirements without external thermal compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR127BUJZ-R2 | Same 1.25 V output and UJ-6 package, but B grade: ±0.12% initial accuracy and 9 ppm/°C max tempco-tighter specs at higher cost. | Required where <±1.5 mV absolute error or <±11.25 μV total temp drift is mandated (e.g., metrology-grade calibrators). | Select ADR127BUJZ-R2 only if tighter initial accuracy and temperature stability are validated as necessary for your system's total error budget. |
| REF191GS | 1.25 V reference in SOIC-8; ±0.2% initial accuracy, 25 ppm/°C tempco, but 120 μA quiescent current and 2.2 V dropout-higher power and larger footprint. | Suitable for board-space-flexible designs where SOIC-8 is acceptable and input voltage ≥3.45 V is guaranteed. | Choose REF191GS only if TSOT-6 assembly constraints are not binding and higher quiescent current is tolerable in the target application. |
Compared with ADR127AUJZ-R2, the ADR127BUJZ-R2 offers superior accuracy and stability at premium cost and same form factor, while REF191GS trades size and efficiency for broader vendor support and legacy design compatibility-neither is pin-compatible, requiring layout revision.
Availability
ADR127AUJZ-R2 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical equipment, data acquisition systems, and automotive subsystems requiring stable component supply with guaranteed long-term availability.
Supply support for ADR127AUJZ-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 ADR127AUJZ-R2 belongs to the ADR12x family of micropower precision voltage references designed specifically for low-voltage, low-power, high-accuracy applications in portable and harsh-environment electronics.
FAQ
What is the maximum input voltage rating for ADR127AUJZ-R2?
The absolute maximum input voltage for ADR127AUJZ-R2 is 20 V relative to GND, as specified in the Absolute Maximum Ratings table. Operation above 18 V is not recommended for reliability; sustained use at 20 V risks exceeding the 40 mW internal power dissipation limit in the TSOT-6 package, especially at elevated ambient temperatures. Always maintain VIN ≤18 V for continuous operation.
Does ADR127AUJZ-R2 require an input capacitor?
No, ADR127AUJZ-R2 does not require an input capacitor for stability. However, a 1 μF to 10 μF ceramic capacitor on VIN improves transient response during supply fluctuations, and adding a parallel 0.1 μF capacitor further reduces high-frequency supply noise. These capacitors are optional enhancements-not mandatory for basic regulation.
Can ADR127AUJZ-R2 drive a 10 kΩ load directly?
Yes, ADR127AUJZ-R2 can drive a 10 kΩ load directly. At 1.25 V output, a 10 kΩ load draws only 125 μA, well within its +5 mA sourcing capability. Load regulation remains ≤400 ppm/mA, so output deviation is <50 μV-negligible for most precision applications. No buffer amplifier is needed unless dynamic load switching exceeds 5 mA peak.
What is the purpose of the three NC pins on ADR127AUJZ-R2?
Pins 1, 5, and 6 of ADR127AUJZ-R2 are designated NC (No Connect) and must be left floating-no electrical connection to GND, VIN, VOUT, or any other net. These pins have no internal bond wires or circuit connections; routing traces or thermal pads to them may cause parasitic coupling or mechanical stress. Per Analog Devices' datasheet, all NC pins are explicitly marked "MUST BE LEFT FLOATING".
How does the dropout voltage of ADR127AUJZ-R2 vary with load current?
ADR127AUJZ-R2 dropout voltage increases with load current: it is specified as 1.45 V at 0 mA, rising to ~1.55 V at +5 mA and ~1.65 V at −2 mA (sinking), based on Figure 8 (Minimum Input Voltage vs. Load Current). This behavior reflects series-pass transistor saturation characteristics-designers must ensure VIN ≥ (1.25 V + VDO) across the full expected load range to maintain regulation.
ADR127AUJZ-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:
- Discontinued at Digi-Key
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.24%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 9µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.7V ~ 18V
- Current - Supply:
- 95µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-6
ADR127AUJZ-R2 FAQ
1.How can I place an order for ADR127AUJZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR127AUJZ-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 ADR127AUJZ-R2 reliable?
The price and inventory of ADR127AUJZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR127AUJZ-R2 is usually 5 days.
3.What payment methods are accepted for ADR127AUJZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR127AUJZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR127AUJZ-R2?
ADR127AUJZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR127AUJZ-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 ADR127AUJZ-R2?
For technical support, including ADR127AUJZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR127AUJZ-R2 requirements.
6.How does Aetrix verify that ADR127AUJZ-R2 is sourced from the original manufacturer or authorized distributors?
All ADR127AUJZ-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 ADR127AUJZ-R2 meets industry standards.
7.What is the process for return or replacement of ADR127AUJZ-R2?
All ADR127AUJZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with ADR127AUJZ-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 ADR127AUJZ-R2 part is unused and in its original packaging.
Return procedure for ADR127AUJZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADR127AUJZ-R2 Tags
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