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Analog Devices Inc. ADR127AUJZ-REEL7
- Part No.:
- ADR127AUJZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
ADR127AUJZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.24% TSOT6
- Quantity:
- Payment:
- Shipping:
Inventory:8,862
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Product details
Overview
ADR127AUJZ-REEL7 from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 1.25 V output with ±0.24% initial accuracy, 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 targets high-stability analog signal chains in space-constrained battery-powered systems.
For engineers reviewing the ADR127AUJZ-REEL7 datasheet, ADR127AUJZ-REEL7 pinout, ADR127AUJZ-REEL7 application, or ADR127AUJZ-REEL7 equivalent, this page delivers verified specifications, TSOT-6 package layout, real-world use cases in medical and automotive sensing, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The ADR127AUJZ-REEL7 implements a patented curvature-corrected band gap architecture to minimize nonlinear output voltage drift over −40°C to +125°C. Its series-mode topology provides both sourcing (+5 mA) and sinking (−2 mA) capability while maintaining stability with only a 0.1 μF output capacitor.
Unlike standard references, it achieves 9 μVp-p (0.1 Hz–10 Hz) and 300 nV/√Hz (10 kHz) noise performance without external filtering. The 1.45 V dropout requirement-higher than ADR121/ADR125-enables reliable operation at ultra-low input margins in 1.8 V–3.3 V system rails when paired with appropriate headroom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V nominal; B-grade variants offer ±0.12% accuracy, but ADR127AUJZ-REEL7 is A-grade (±0.24%), suitable for mid-precision ADC/DAC biasing. |
| Initial Accuracy | ±0.24% at 25°C; defines worst-case DC offset in calibration-critical circuits like portable ECG front-ends. |
| Temp Coefficient | Max 25 ppm/°C over −40°C to +125°C; contributes ≤31.25 μV/°C drift, enabling <1 LSB error in 16-bit systems across full industrial range. |
| Dropout Voltage | 1.45 V at 0 mA load; sets minimum VIN = 2.7 V, allowing direct use with single-cell Li-ion (3.0–4.2 V) or 3.3 V LDO outputs. |
| Quiescent Current | 85 μA typical; enables >1-year battery life in 10 μA sleep-mode data loggers using coin cells or alkaline batteries. |
| Output Noise | 9 μVp-p (0.1–10 Hz), 300 nV/√Hz (10 kHz); supports 18+ ENOB in precision sigma-delta ADCs without additional filtering. |
| Load Current | +5 mA / −2 mA sink-source capability; drives SAR ADC reference inputs, op-amp bias networks, and small DAC loads directly. |
Pinout & Package
The ADR127AUJZ-REEL7 is housed in a 6-lead TSOT (UJ-6) package measuring 2.90 mm × 1.60 mm × 0.95 mm, optimized for high-density PCB layouts and automated assembly. All NC pins must remain unconnected and floating per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 6 | No Connect (NC) | Internally unconnected; must be left floating-no routing or grounding permitted to avoid parasitic coupling or latch-up risk. |
| 2 | Ground (GND) | Reference return path; requires low-impedance connection to clean analog ground plane to maintain 9 μVp-p noise performance. |
| 3 | Input Voltage (VIN) | Accepts 2.7–18 V; needs ≥1.45 V above VOUT for regulation; decoupling with 0.1 μF ceramic mandatory for PSRR integrity. |
| 4 | Output Voltage (VOUT) | Stable 1.25 V reference; requires 0.1 μF ceramic capacitor to ground for stability; drives loads up to +5 mA / −2 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Band Gap | Reduces VOUT vs. temperature nonlinearity, achieving flat 25 ppm/°C max drift across −40°C to +125°C without external trimming. |
| Ultra-Low Quiescent Current | 85 μA typical enables multi-year operation in energy-harvesting sensors and implantable medical devices with microamp-level budgets. |
| Low-Frequency Noise Performance | 9 μVp-p (0.1–10 Hz) ensures sub-LSB stability in high-resolution weigh scales and precision thermistor bridges. |
| Sink/Source Capability | ±2 mA to ±5 mA bidirectional current handling eliminates need for external buffer op-amps in most 12–16 bit data acquisition channels. |
| TSOT-6 Package Compatibility | JEDEC MO-193-AA compliant footprint allows drop-in replacement of similar-area references and supports 0.4 mm pitch reflow assembly. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) analog front-end requiring stable excitation for electrochemical sensor strips. IC Role / Device Role / Timing Role: Precision 1.25 V reference for transimpedance amplifier bias and ADC reference voltage. Use Value: ±0.24% initial accuracy and 25 ppm/°C drift ensure <0.5% measurement error across body temperature range (32–42°C), meeting ISO 15197 clinical accuracy requirements. | Use Scenario: Environmental monitoring node logging temperature/humidity with 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Low-noise reference for ADC conversion and internal DAC-based sensor excitation. Use Value: 9 μVp-p (0.1–10 Hz) noise and 85 μA quiescent current enable 100,000-sample battery life on CR2032, with <1 LSB INL drift over 10-year deployment. |
| Automotive Cabin Sensors | Industrial Process Transmitters |
Use Scenario: Occupant detection system using capacitive sensing with rail-to-rail input amplifiers. IC Role / Device Role / Timing Role: Stable 1.25 V common-mode voltage reference for differential amplifier stages. Use Value: −40°C to +125°C operation and 1.45 V dropout allow direct connection to 5 V vehicle bus via compact 3.3 V intermediate LDO, reducing BOM count by one regulator. | Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Primary voltage reference for DAC-controlled current output stage and sensor bridge excitation. Use Value: 150 ppm/1000 hrs long-term stability ensures calibration validity over 24-month maintenance cycles without field recalibration. |
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-REEL7 | B-grade: ±0.12% initial accuracy and 9 ppm/°C max tempco vs. ADR127AUJZ-REEL7's ±0.24% and 25 ppm/°C. | Required where <0.1% absolute accuracy or <10 ppm/°C drift is mandated, e.g., metrology-grade calibrators. | Select ADR127BUJZ-REEL7 only if tighter initial tolerance and lower drift justify cost premium and qualification effort. |
| REF1212AIDBVR | Texas Instruments REF1212 offers 1.25 V output, ±0.1% initial accuracy, 50 ppm/°C max tempco, and 125 μA IQ in SOT-23-5. | Higher tempco and quiescent current limit use in extended-temp or ultra-low-power designs; pinout differs (no NC pins). | Use REF1212AIDBVR only for cost-sensitive, non-extended-temp applications where 50 ppm/°C drift is acceptable and board layout permits SOT-23-5 footprint. |
Compared with ADR127AUJZ-REEL7, the B-grade variant improves accuracy and drift at higher cost and identical footprint, while REF1212AIDBVR trades lower initial error for significantly worse thermal stability and higher power-making ADR127AUJZ-REEL7 optimal for balanced industrial and medical designs demanding proven 25 ppm/°C performance at minimal IQ.
Availability
ADR127AUJZ-REEL7 is available at Aetrix Electronics and suitable for portable medical equipment, battery-powered instrumentation, and automotive cabin sensors requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for ADR127AUJZ-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 and a legacy of innovation in precision signal conditioning.
The ADR12x family-including ADR127AUJZ-REEL7-is engineered for micropower, high-accuracy voltage referencing in space- and energy-constrained applications, emphasizing low dropout, ultra-low noise, and extended temperature reliability.
FAQ
What is the maximum input voltage rating for ADR127AUJZ-REEL7?
The absolute maximum input voltage for ADR127AUJZ-REEL7 is 20 V relative to GND, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. For reliable regulation, VIN must remain within 2.7 V to 18 V, with ≥1.45 V headroom above VOUT (1.25 V) to maintain output stability under all load conditions. Exceeding 18 V during transient events should be prevented with clamping or pre-regulation.
Does ADR127AUJZ-REEL7 require an input capacitor?
No, ADR127AUJZ-REEL7 does not require an input capacitor for basic stability. However, a 1 μF to 10 μF ceramic capacitor at the VIN pin-optionally paralleled with 0.1 μF-is recommended to improve transient response during sudden supply fluctuations and reduce high-frequency noise coupling. This configuration enhances PSRR performance without affecting regulation accuracy or startup behavior of the ADR127AUJZ-REEL7.
Can ADR127AUJZ-REEL7 drive a 10 kΩ load directly?
Yes, ADR127AUJZ-REEL7 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 is specified at 85–400 ppm/mA, so the resulting error is <0.05%-fully compatible with 12-bit precision. No buffer is needed unless dynamic load steps exceed ±2 mA or noise immunity below 1 μVp-p is required.
What is the purpose of the NC pins on ADR127AUJZ-REEL7?
The NC pins (1, 5, and 6) on ADR127AUJZ-REEL7 are internally unconnected and must be left floating-neither tied to GND nor routed-to prevent parasitic capacitance, leakage paths, or potential latch-up. Datasheet Figure 1 explicitly states "NC = NO CONNECT" and "MUST BE LEFT FLOATING." Connecting them violates the device's electrical specification and may degrade noise, accuracy, or thermal performance of the ADR127AUJZ-REEL7.
How does the 1.45 V dropout of ADR127AUJZ-REEL7 compare to ADR121/ADR125?
ADR127AUJZ-REEL7 has a 1.45 V dropout at 0 mA, significantly higher than the 300 mV dropout of ADR121/ADR125. This reflects its lower 1.25 V output voltage and different internal architecture optimized for ultra-low-voltage operation. While ADR121/ADR125 suit 2.5 V/5.0 V systems with tight headroom, ADR127AUJZ-REEL7 targets 1.25 V reference needs where input rails start at 2.7 V-ensuring regulation integrity even with aging batteries or LDO droop in the ADR127AUJZ-REEL7 supply path.
ADR127AUJZ-REEL7 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:
- Active
- 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-REEL7 FAQ
1.How can I place an order for ADR127AUJZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR127AUJZ-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 ADR127AUJZ-REEL7 reliable?
The price and inventory of ADR127AUJZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR127AUJZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR127AUJZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR127AUJZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR127AUJZ-REEL7?
ADR127AUJZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR127AUJZ-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 ADR127AUJZ-REEL7?
For technical support, including ADR127AUJZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR127AUJZ-REEL7 requirements.
6.How does Aetrix verify that ADR127AUJZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR127AUJZ-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 ADR127AUJZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR127AUJZ-REEL7?
All ADR127AUJZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR127AUJZ-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 ADR127AUJZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR127AUJZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADR127AUJZ-REEL7 Tags
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