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Texas Instruments REF2041AIDDCR
- Part No.:
- REF2041AIDDCR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF2041AIDDCR.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
REF2041AIDDCR from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC providing precise VREF = 4.096 V and VBIAS = 2.048 V outputs in a single SOT-23-5 package. It delivers ±0.05% initial accuracy, 8 ppm/°C max temperature drift (–40°C to 125°C), and 6 ppm/°C max VREF–VBIAS tracking over –40°C to 85°C - enabling high-precision biasing of bipolar ADC inputs in single-supply industrial measurement systems.
For engineers reviewing the REF2041AIDDCR datasheet, REF2041AIDDCR pinout, REF2041AIDDCR application, or REF2041AIDDCR equivalent, this device is selected for demanding analog signal chains requiring matched dual references with sub-10 ppm/°C drift, <430 µA quiescent current, and operation down to 10 mV dropout - especially where board space, thermal stability, and long-term accuracy are critical.
Technical Context
The REF2041AIDDCR implements a band-gap core with e-Trim™ post-mold calibration to minimize initial error and temperature coefficient across both outputs. Its architecture uses two independent buffers to generate VREF and VBIAS (VREF/2), with resistor networks (R1/R2 and R3/R4) ensuring precise 2:1 ratio matching.
Both outputs share identical electrical specifications: ±20 mA sourcing/sinking capability, 3 ppm/V line regulation, 8 ppm/mA load regulation, and low-frequency noise of 12 ppmPP (0.1–10 Hz). The enable input (EN) supports shutdown mode with <5 µA current draw, and thermal hysteresis is limited to ≤60 ppm over –40°C to 125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 4.096 V - precisely matches 12-bit full-scale ADC reference for LSB = 1 mV resolution |
| VBIAS Output | 2.048 V - exact half of VREF, enabling true mid-rail biasing of ±VREF differential inputs |
| Initial Accuracy | ±0.05% - ensures <±2.05 mV absolute error at 25°C without system calibration |
| Temp Drift (VREF/VBIAS) | 8 ppm/°C max (–40°C to 125°C) - contributes <±1.3 mV total drift over full range |
| VREF–VBIAS Tracking | 6 ppm/°C max (–40°C to 85°C) - maintains <±0.5 mV relative error for ratiometric signal conditioning |
| Quiescent Current | 360 µA typ - enables >1-year battery life in portable 3.3 V/5 V instrumentation |
| Dropout Voltage | 10 mV at 20 mA - allows operation from VIN ≥ 4.106 V, critical for low-voltage battery systems |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected; RoHS-compliant matte-Sn finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBIAS | Output | Provides 2.048 V bias voltage; sinks/sources ±20 mA; shares same drift and accuracy specs as VREF |
| 2 - GND | Reference | Analog ground return for both outputs; must be low-impedance to minimize noise coupling |
| 3 - EN | Input | Enable control: device active when EN ≥ VIN – 0.7 V; draws <5 µA in shutdown |
| 4 - VIN | Input | Supply input (4.106 V min to 5.5 V max); powers internal band-gap and buffers |
| 5 - VREF | Output | Primary 4.096 V reference output; used for ADC/DAC reference and precision scaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched outputs (VREF + VBIAS) | Eliminates need for external resistor divider and op-amp buffer, reducing BOM count and layout area by >40% |
| e-Trim™ calibration | Compensates for die-level mismatch and package-induced stress, achieving ±0.05% accuracy without post-assembly trimming |
| 6 ppm/°C VREF–VBIAS tracking | Maintains ratiometric integrity in temperature-varying environments - essential for precision current sensing and bridge measurements |
| 10 mV dropout at 20 mA | Enables direct use with Li-ion (3.0–4.2 V) or coin-cell sources without LDO pre-regulation |
| 12 ppmPP low-frequency noise | Supports 16-bit+ effective resolution in DC-coupled data acquisition without additional filtering |
Applications
| Electricity Meter | Analog Input Module |
|---|---|
Use Scenario: High-accuracy energy measurement using 24-bit sigma-delta ADCs sampling current/voltage sensors under varying ambient temperatures. IC Role / Device Role / Timing Role: Provides VREF for ADC reference and VBIAS for mid-rail biasing of shunt-based current signals - maintaining ratiometric accuracy across –25°C to 70°C operating range. Use Value: Enables Class 0.2 meter compliance with <±0.02% gain error contribution over lifetime, eliminating field recalibration. |
Use Scenario: Industrial PLC analog input card digitizing ±10 V sensor signals (e.g., RTDs, strain gauges) with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Supplies matched VREF and VBIAS to configure differential ADC inputs for bipolar signal acquisition without external level-shifting circuitry. Use Value: Reduces component count by 3 op-amps and 6 precision resistors per channel while improving THD by >15 dB via inherent tracking. |
| Servo Drive Control Module | Clinical Digital Thermometer |
Use Scenario: Closed-loop motor control using isolated current sensing and high-resolution position feedback in compact drives. IC Role / Device Role / Timing Role: Generates stable reference pair for isolated ADCs measuring phase currents and encoder voltages - synchronized to PWM switching frequency. Use Value: Ensures <±0.1% torque ripple reduction by minimizing reference-induced gain drift during 0–85°C thermal transients. |
Use Scenario: Medical-grade contact thermometer with thermistor front-end and 20-bit delta-sigma ADC for ±0.05°C resolution. IC Role / Device Role / Timing Role: Delivers ultra-stable VREF for ADC reference and VBIAS for thermistor biasing - operating from single 3.3 V coin cell supply. Use Value: Achieves required accuracy with <20 µA total system current, extending battery life to >12 months per charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF2041AIDBVR | SOT-23-5 package with standard Sn finish (vs. matte-Sn on REF2041AIDDCR); identical electrical specs | Lacks enhanced corrosion resistance for Class III harsh-environment deployments | Select REF2041AIDDCR for medical, utility, or outdoor equipment exposed to humidity/salinity; use REF2041AIDBVR for cost-sensitive indoor applications. |
| ADR4540BRZ | Single-output 4.096 V reference (no VBIAS); 3 ppm/°C drift; SOIC-8 package; higher 950 µA quiescent current | Requires external divider + buffer to replicate VBIAS function; occupies 3× PCB area | Choose ADR4540BRZ only if system already uses SOIC footprints and can accommodate added components for VBIAS generation. |
Compared with REF2041AIDDCR, REF2041AIDBVR offers identical performance at lower cost but reduced environmental robustness, while ADR4540BRZ trades integration and power efficiency for slightly better drift spec - making REF2041AIDDCR optimal for space-constrained, battery-powered, or corrosion-prone precision measurement designs.
Availability
REF2041AIDDCR is available at Aetrix Electronics and suitable for electricity metering, analog I/O modules, servo drive controls, and clinical instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for REF2041AIDDCR 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision voltage references and signal-chain solutions.
The REF20xx family was designed specifically for high-accuracy industrial and medical measurement systems needing dual, matched reference outputs in ultra-small packages - addressing the demand for integrated, low-drift, low-power alternatives to discrete reference + divider + buffer solutions.
FAQ
What is the maximum operating temperature range for the REF2041AIDDCR?
The REF2041AIDDCR is rated for continuous operation from –40°C to +125°C ambient temperature. Its 8 ppm/°C maximum temperature drift and 6 ppm/°C VREF–VBIAS tracking are guaranteed across this full range, with thermal hysteresis limited to ≤60 ppm after cycling. This makes REF2041AIDDCR suitable for automotive under-hood, industrial motor drives, and outdoor utility metering applications where thermal extremes are encountered.
Does the REF2041AIDDCR require an external capacitor for stability?
No, the REF2041AIDDCR is internally compensated and remains stable with output capacitors from 0 µF to 10 µF. Unlike many references, it does not require a minimum ESR or specific capacitor type - supporting ceramic, tantalum, or polymer capacitors for noise filtering or transient response improvement. This simplifies design and eliminates risk of oscillation due to capacitor selection errors.
How does the enable (EN) pin function on the REF2041AIDDCR?
The EN pin on REF2041AIDDCR is a CMOS-compatible input that places the device in low-power shutdown mode (<5 µA ICC) when held below VIN – 0.7 V, and activates normal operation when driven above that threshold. It has no pull-up/down resistor and must be actively driven; floating EN is undefined. This enables precise power sequencing in multi-rail systems and extends battery life in portable instruments using REF2041AIDDCR.
Can the REF2041AIDDCR source and sink current simultaneously on both outputs?
Yes - both VREF and VBIAS outputs are fully buffered and capable of sourcing and sinking up to ±20 mA independently. They do not share current paths, so simultaneous sourcing on VREF and sinking on VBIAS (or vice versa) is supported without interaction or derating. This enables flexible biasing of active filters, transducer interfaces, and programmable gain stages without external amplifiers.
What is the long-term stability specification for the REF2041AIDDCR?
The REF2041AIDDCR exhibits 25 ppm typical long-term stability over the first 1000 hours of operation at 35°C, with a maximum specified drift of 50 ppm. This value reflects output voltage change due to aging effects in the band-gap core and e-Trim™ elements - significantly better than untrimmed references and sufficient for 10+ year field deployment in metrology-grade equipment without recalibration.
REF2041AIDDCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V, 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12ppmp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.116V ~ 5.5V
- Current - Supply:
- 460µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
REF2041AIDDCR FAQ
1.How can I place an order for REF2041AIDDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2041AIDDCR 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 REF2041AIDDCR reliable?
The price and inventory of REF2041AIDDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2041AIDDCR is usually 5 days.
3.What payment methods are accepted for REF2041AIDDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2041AIDDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2041AIDDCR?
REF2041AIDDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2041AIDDCR 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 REF2041AIDDCR?
For technical support, including REF2041AIDDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2041AIDDCR requirements.
6.How does Aetrix verify that REF2041AIDDCR is sourced from the original manufacturer or authorized distributors?
All REF2041AIDDCR 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 REF2041AIDDCR meets industry standards.
7.What is the process for return or replacement of REF2041AIDDCR?
All REF2041AIDDCR units undergo pre-shipment inspection (PSI). If there is an issue with REF2041AIDDCR, 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 REF2041AIDDCR part is unused and in its original packaging.
Return procedure for REF2041AIDDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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