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Texas Instruments REF2025AIDDCT
- Part No.:
- REF2025AIDDCT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF2025AIDDCT.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:635
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Product details
Overview
REF2025AIDDCT from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC delivering precise 2.5 V (VREF) and 1.25 V (VREF/2) outputs for single-supply signal conditioning. It achieves ±0.05% initial accuracy, 8 ppm/°C max temperature drift over –40°C to 125°C, and 6 ppm/°C max VREF–VBIAS tracking over –40°C to 85°C. Used in high-precision ADC biasing for electricity meters and industrial analog I/O modules.
For engineers reviewing the REF2025AIDDCT datasheet, REF2025AIDDCT pinout, REF2025AIDDCT application, or REF2025AIDDCT equivalent, key selection criteria include dual-rail output matching, microsize SOT23-5 footprint, sub-10 mV dropout, ±20 mA drive capability, and guaranteed tracking performance across extended temperature ranges.
Technical Context
The REF2025AIDDCT integrates a band-gap core with two independent e-Trim™-calibrated buffers-one for VREF and one for VBIAS-ensuring matched initial accuracy and temperature coefficients. Its architecture enables simultaneous sourcing and sinking up to ±20 mA per output without compromising stability or accuracy.
It operates from VIN ≥ VREF + 20 mV, supports enable-controlled shutdown (3.3–5 µA quiescent current), and maintains <12 ppmPP low-frequency noise (0.1–10 Hz). Thermal hysteresis is limited to 60 ppm (cycle 1) and 35 ppm (cycle 2), with long-term stability of 25 ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 2.5 V ±0.05% - stable reference for 16-bit+ ADCs requiring mid-scale bias |
| VBIAS Output | 1.25 V ±0.05% - exact half of VREF, enabling true bipolar signal centering |
| Temp Drift (VREF/VBIAS) | ±8 ppm/°C max (–40°C to 125°C) - ensures <±0.02% full-range error over industrial temp range |
| VREF–VBIAS Tracking | ±6 ppm/°C max (–40°C to 85°C) - maintains <±0.01% relative error for differential sensing |
| Dropout Voltage | 10 mV at 20 mA - allows operation from 2.52 V supply, critical for battery-powered systems |
| Quiescent Current | 360 µA typical - enables >1-year runtime on coin-cell batteries in portable instrumentation |
| Output Drive | ±20 mA - eliminates need for external op-amp buffers in analog input/output modules |
Pinout & Package
SOT23-5 package (2.90 mm × 1.60 mm), surface-mount, matte-Sn finish option available for corrosion resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBIAS | Output | Provides 1.25 V reference (VREF/2); sinks/sources ±20 mA; matches VREF drift within ±6 ppm/°C |
| 2 - GND | Reference | Analog ground return for both outputs; must be low-impedance to maintain 8 ppm/°C drift spec |
| 3 - EN | Input | Enable control: device active when EN ≥ VIN – 0.7 V; enters shutdown below 0.7 V |
| 4 - VIN | Input | Supply input: minimum 2.52 V (VREF + 20 mV); max 6 V; powers both reference outputs |
| 5 - VREF | Output | Primary 2.5 V reference output; identical accuracy/drift specs as VBIAS; drives ADC REF pins directly |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched outputs | VREF = 2.5 V and VBIAS = 1.25 V with ±0.05% initial accuracy and ±8 ppm/°C drift on both |
| e-Trim™ calibration | Package-level trimming after molding corrects for die stress and transistor mismatch, ensuring spec compliance |
| Ultra-low dropout | 10 mV at full 20 mA load enables use with Li-ion cells down to 2.52 V without LDO pre-regulation |
| High PSRR | ≥80 dB at 100 Hz (CL = 10 µF) - rejects supply ripple in noisy industrial power rails |
| Low noise | 12 ppmPP (0.1–10 Hz), 0.25 ppm/√Hz at 100 Hz - supports 24-bit delta-sigma ADCs without filtering |
Applications
| Electricity Meter | Analog Input Module |
|---|---|
Use Scenario: High-accuracy energy measurement using 24-bit sigma-delta ADCs with bipolar current/voltage inputs. IC Role / Device Role / Timing Role: REF2025AIDDCT provides VREF for ADC full-scale and VBIAS for mid-scale common-mode bias of shunt-based current sensing. Use Value: Dual-output matching eliminates inter-channel gain/offset errors; ±6 ppm/°C tracking ensures <0.01% THD degradation over temperature. |
Use Scenario: Industrial PLC analog input card accepting ±10 V or 4–20 mA signals with 16-bit SAR ADC. IC Role / Device Role / Timing Role: REF2025AIDDCT supplies precision 2.5 V reference and 1.25 V bias to level-shift bipolar inputs into unipolar ADC range. Use Value: Eliminates discrete resistor divider + op-amp solution; saves 35 mm² PCB area and reduces BOM count by 4 components. |
| Analog Output Module | Servo Drive Control Module |
Use Scenario: Precision 0–10 V or ±10 V DAC output stage driving actuators with <0.1% FSR linearity requirement. IC Role / Device Role / Timing Role: REF2025AIDDCT sets DAC reference and generates internal bias for rail-to-rail output amplifier stage. Use Value: ±20 mA drive capability allows direct connection to DAC REF and op-amp non-inverting input; no buffer needed. |
Use Scenario: Motor phase current sensing in servo inverters using isolated amplifiers and 16-bit ADCs. IC Role / Device Role / Timing Role: REF2025AIDDCT delivers matched VREF/VBIAS to condition differential current sense signals before isolation. Use Value: 6 ppm/°C VREF–VBIAS tracking minimizes common-mode error in isolated current feedback loops across –40°C to 85°C. |
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 |
|---|---|---|---|
| REF2025AIDBVR | SOT23-5 package same; identical electrical specs; tape-and-reel packaging only (no cut-tape) | No functional difference; suited for automated high-volume assembly | Select REF2025AIDBVR for production runs >5k units where reel delivery is preferred. |
| ADR4525BRZ | Single-output 2.5 V reference (no VBIAS); 2 ppm/°C drift; higher cost; SOIC-8 package | Requires external resistor divider + buffer to generate VBIAS; adds 0.05% matching error and thermal drift | Choose ADR4525BRZ only if ultra-low drift (<2 ppm/°C) is mandatory and board space permits added components. |
Compared with REF2025AIDDCT, REF2025AIDBVR offers identical performance in reel format, while ADR4525BRZ trades dual-output convenience for lower drift but increases design complexity and cost per channel.
Availability
REF2025AIDDCT is available at Aetrix Electronics and suitable for electricity metering, analog I/O modules, and servo drive control applications requiring stable component supply with guaranteed long-term availability.
Supply support for REF2025AIDDCT 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 data converter support circuits.
The REF20xx family was designed specifically for high-accuracy industrial signal chains requiring dual-rail references in minimal space-targeting electricity meters, programmable logic controllers, and test equipment.
FAQ
What is the maximum load current supported by each output of the REF2025AIDDCT?
The REF2025AIDDCT supports ±20 mA continuous current on both VREF and VBIAS outputs. This allows direct driving of ADC reference inputs, op-amp bias networks, and DAC reference pins without external buffering. Performance remains within datasheet specifications-including 8 ppm/°C drift and ±0.05% accuracy-even at full ±20 mA load across the –40°C to 125°C temperature range.
Does the REF2025AIDDCT require an external capacitor for stability?
No, the REF2025AIDDCT is internally compensated and stable with 0–10 µF output capacitance. A 1 µF ceramic capacitor is recommended on each output for optimal transient response and noise reduction. Larger capacitors (up to 10 µF) improve PSRR above 100 Hz but do not affect DC accuracy or thermal drift performance of the REF2025AIDDCT.
How does the enable (EN) pin function on the REF2025AIDDCT?
The EN pin controls active/shutdown mode: device operates normally when EN ≥ VIN – 0.7 V; it enters low-power shutdown (3.3–5 µA ICC) when EN < 0.7 V. The transition is monotonic with no glitching. During shutdown, both VREF and VBIAS outputs go high-impedance-critical for power-gated subsystems in battery-operated REF2025AIDDCT designs.
Can the REF2025AIDDCT be used in systems with supply voltages below 2.5 V?
No-the REF2025AIDDCT requires VIN ≥ VREF + 20 mV (i.e., ≥2.52 V) to maintain regulation and specified accuracy. Below this threshold, VREF and VBIAS drop out of regulation. For sub-2.5 V systems, consider the REF2012 (1.25 V VREF) or REF2030 (3.0 V VREF) variants-both share identical architecture and specs with REF2025AIDDCT.
What is the long-term stability specification for the REF2025AIDDCT?
The REF2025AIDDCT exhibits 25 ppm maximum long-term stability over 1000 hours under standard operating conditions (TA = 35°C, VIN = 5 V). This value reflects typical aging behavior measured on soldered PCBs and is validated per TI's SBOS600E datasheet Section 8.2. It ensures predictable performance in field-deployed REF2025AIDDCT applications like clinical thermometers and lab instrumentation.
REF2025AIDDCT 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):
- 1.24V, 2.5V
- 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:
- 2.52V ~ 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
REF2025AIDDCT FAQ
1.How can I place an order for REF2025AIDDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2025AIDDCT 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 REF2025AIDDCT reliable?
The price and inventory of REF2025AIDDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2025AIDDCT is usually 5 days.
3.What payment methods are accepted for REF2025AIDDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2025AIDDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2025AIDDCT?
REF2025AIDDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2025AIDDCT 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 REF2025AIDDCT?
For technical support, including REF2025AIDDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2025AIDDCT requirements.
6.How does Aetrix verify that REF2025AIDDCT is sourced from the original manufacturer or authorized distributors?
All REF2025AIDDCT 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 REF2025AIDDCT meets industry standards.
7.What is the process for return or replacement of REF2025AIDDCT?
All REF2025AIDDCT units undergo pre-shipment inspection (PSI). If there is an issue with REF2025AIDDCT, 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 REF2025AIDDCT part is unused and in its original packaging.
Return procedure for REF2025AIDDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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