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Texas Instruments REF2025AIDDCR
- Part No.:
- REF2025AIDDCR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF2025AIDDCR.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,883
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Product details
Overview
REF2025AIDDCR from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC providing precisely trimmed 2.5 V (VREF) and 1.25 V (VREF/2, VBIAS) outputs in a single SOT-23-5 package. It delivers ±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 - enabling high-precision biasing of bipolar ADC inputs in single-supply industrial measurement systems.
For engineers reviewing the REF2025AIDDCR datasheet, REF2025AIDDCR pinout, REF2025AIDDCR application, or REF2025AIDDCR equivalent, key selection criteria include dual-rail reference stability under load variation (±20 mA sourcing/sinking), ultra-low dropout (10 mV), sub-430 µA quiescent current, and matched thermal tracking between outputs - critical for metrology-grade signal chains in battery-powered or thermally varying environments.
Technical Context
The REF2025AIDDCR implements a band-gap core with e-Trim™ post-mold calibration to achieve tight initial accuracy and low drift across temperature. Its architecture uses two independent buffers - one for VREF and one for VBIAS - each driven from the same trimmed band-gap voltage node, ensuring inherent ratio accuracy and minimal tracking error.
Both outputs share identical electrical specifications: ±0.05% initial accuracy, 8 ppm/°C max drift, 3 ppm/V line regulation, and 8 ppm/mA load regulation. The enable input (EN) supports shutdown mode (≤5 µA ICC), and the device operates with VIN as low as VREF + 20 mV, supporting operation from near-threshold supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 2.5 V ±0.05% - stable reference for 12–24-bit ADCs requiring mid-scale biasing in single-supply systems |
| VBIAS Output | 1.25 V ±0.05% - exact VREF/2 ratio with ≤6 ppm/°C tracking error up to 85°C, enabling true bipolar signal centering |
| Temp Drift (VREF/VBIAS) | 8 ppm/°C max (–40°C to 125°C) - ensures <±0.02% output shift over full industrial temperature range |
| Dropout Voltage | 10 mV at 20 mA - allows operation from supplies as low as 2.51 V, ideal for coin-cell or energy-harvesting systems |
| Quiescent Current | 360 µA typical (active), ≤5 µA (shutdown) - enables always-on precision references in low-power IoT sensor nodes |
| Output Drive | ±20 mA sourcing/sinking per output - eliminates need for external buffers when driving ADC reference inputs or op-amp bias networks |
| Noise (0.1–10 Hz) | 12 ppmPP (≈3 µVPP at 2.5 V) - supports high-resolution DC measurements without added filtering overhead |
Pinout & Package
SOT-23-5 (DDC) package: 2.90 mm × 1.60 mm body, matte-tin (Sn) lead finish, JEDEC-compliant footprint compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBIAS | Output | Provides 1.25 V reference (VREF/2); electrically identical to VREF in accuracy, drift, and drive capability |
| 2 - GND | Reference | Analog ground return for both outputs; must be connected to low-impedance system ground plane |
| 3 - EN | Input | Active-high enable: device enabled when EN ≥ VIN – 0.7 V; pulls to GND for shutdown (ICC ≤ 5 µA) |
| 4 - VIN | Input | Supply input: accepts 2.52 V to 5.5 V; dropout as low as 10 mV enables use with LDOs or battery sources |
| 5 - VREF | Output | Primary 2.5 V reference output; shares all specs with VBIAS including ±20 mA drive and 8 ppm/°C drift |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched outputs | VREF = 2.5 V and VBIAS = 1.25 V with ≤6 ppm/°C tracking error over –40°C to 85°C - eliminates discrete resistor divider inaccuracies in ADC bias networks |
| e-Trim™ calibration | Post-mold trimming of both outputs for ±0.05% initial accuracy and 8 ppm/°C drift - compensates for molding-induced stress and transistor mismatch |
| Ultra-low dropout | 10 mV at full 20 mA load - supports operation from 2.51 V supply, extending battery life in portable instrumentation |
| High output drive | ±20 mA per output - directly drives ADC reference pins, SAR DACs, or op-amp bias circuits without external buffers |
| Low-noise performance | 12 ppmPP (0.1–10 Hz) at 2.5 V - enables <16-bit effective resolution in DC-coupled precision measurement front-ends |
Applications
| Electricity Meter | Analog Input Module |
|---|---|
Use Scenario: High-accuracy polyphase energy metering with isolated ADCs sampling current/voltage waveforms. IC Role / Device Role / Timing Role: Provides 2.5 V VREF for ADC full-scale and 1.25 V VBIAS to center AC-coupled current-sense signals at midscale. Use Value: Matched VREF–VBIAS tracking ensures consistent offset cancellation across temperature, maintaining <0.1% metering accuracy over –25°C to 70°C operating range. |
Use Scenario: Industrial PLC analog input card digitizing ±10 V or 4–20 mA sensor signals. IC Role / Device Role / Timing Role: Supplies precision 2.5 V reference to 24-bit ΣΔ ADC and 1.25 V bias to op-amp level-shifting stage for bipolar input conditioning. Use Value: Dual-output architecture reduces component count vs. separate references, while 8 ppm/°C drift meets IEC 61000-4-30 Class A requirements for measurement repeatability. |
| Servo Drive Control Module | Clinical Digital Thermometer |
Use Scenario: Closed-loop motor control with high-resolution current sensing and position feedback. IC Role / Device Role / Timing Role: Delivers stable 2.5 V reference to current-sense amplifier ADC and 1.25 V bias for differential shunt voltage measurement. Use Value: ±20 mA drive capability supports direct connection to ADC reference pins without gain error from series resistance, improving torque ripple rejection. |
Use Scenario: Portable medical thermometer using thermistor or RTD with 20-bit ADC for ±0.05°C resolution. IC Role / Device Role / Timing Role: Generates 2.5 V VREF for ADC and 1.25 V VBIAS to bias ratiometric bridge or Wheatstone sensor interface. Use Value: 360 µA quiescent current and 10 mV dropout enable >1-year battery life on CR2032 while maintaining <0.01% reference error over clinical temperature range (0°C–50°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF2025AISDDCR | Matte-Sn finish (vs. Sn on REF2025AIDDCR); identical electrical specs and SOT-23-5 package | Required for Battelle Class III corrosion resistance in high-humidity or saline environments (e.g., marine instrumentation) | Select REF2025AISDDCR only if enhanced surface corrosion resistance is mandated by end-equipment environmental certification. |
| ADR4525BRZ | Single-output 2.5 V reference (no VBIAS); 2 ppm/°C drift, 0.02% initial accuracy, SOIC-8 package, higher cost | Requires external resistor divider + buffer to generate VREF/2; better drift but larger size and no integrated tracking | Choose ADR4525BRZ only when ultimate drift performance (2 ppm/°C) outweighs board space, cost, and tracking benefits of REF2025AIDDCR. |
Compared with REF2025AISDDCR, the REF2025AIDDCR offers identical precision but lacks matte-Sn corrosion protection; compared with ADR4525BRZ, it trades 6 ppm/°C higher drift for integrated dual-output functionality, 40% smaller footprint, and lower system BOM count - making it optimal for space-constrained, cost-sensitive industrial measurement designs where matched VREF/VBIAS tracking is essential.
Availability
REF2025AIDDCR is available at Aetrix Electronics and suitable for electricity metering, analog input/output modules, servo drive control, and clinical thermometer applications requiring stable component supply, long-term calibration integrity, and industrial temperature operation.
Supply support for REF2025AIDDCR 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, dual-rail biasing in single-supply data acquisition systems - targeting industrial automation, energy metering, and portable test equipment where space, power, and thermal tracking are critical constraints.
FAQ
What is the maximum load current supported by each output of the REF2025AIDDCR?
The REF2025AIDDCR supports ±20 mA sourcing and sinking capability on both the VREF and VBIAS outputs. This means each output can deliver up to 20 mA while maintaining specified accuracy and drift performance - sufficient to drive most precision ADC reference inputs, op-amp bias networks, or small DACs without external buffering. The REF2025AIDDCR maintains its 8 ppm/°C drift and ±0.05% initial accuracy across this full load range when operated within recommended conditions.
Does the REF2025AIDDCR require an external capacitor for stability?
No, the REF2025AIDDCR is internally compensated and remains stable with output capacitors from 0 µF to 10 µF. Unlike many references that demand minimum capacitance for phase margin, the REF2025AIDDCR's design allows direct connection to ADC reference pins or op-amp inputs without added COUT - simplifying layout and eliminating capacitor-related drift or aging effects. This feature is explicitly validated in the datasheet's "Capacitive Load" specification (0–10 µF range).
How does the VREF–VBIAS tracking performance of the REF2025AIDDCR benefit precision measurement systems?
The REF2025AIDDCR guarantees ≤6 ppm/°C VREF–VBIAS tracking over –40°C to 85°C and ≤7 ppm/°C over –40°C to 125°C. This ensures the 1.25 V VBIAS stays precisely at half the 2.5 V VREF across temperature - critical for accurate bipolar signal centering in ADC front-ends. In a 24-bit system, this tracking limits relative offset error to <1 LSB over industrial temperature ranges, eliminating calibration drift caused by resistor divider mismatches or separate reference ICs.
Can the REF2025AIDDCR operate from a 2.7 V supply?
Yes - the REF2025AIDDCR supports VIN as low as VREF + 20 mV (i.e., 2.52 V minimum) at full load, so a 2.7 V supply is well within specification. With only 10 mV dropout at 20 mA, the device delivers full 2.5 V VREF and 1.25 V VBIAS even at this low input, making it suitable for single-cell Li-ion (2.7–4.2 V) or alkaline (2.7–4.5 V) powered instruments. Quiescent current remains at 360 µA, preserving battery life without sacrificing reference stability.
What is the purpose of the EN pin on the REF2025AIDDCR, and how should it be used?
The EN pin is an active-high enable input: the REF2025AIDDCR enters shutdown mode (ICC ≤ 5 µA) when EN < VIN – 0.7 V, and activates when EN ≥ VIN – 0.7 V. It is not a logic-level pin - it tracks VIN, allowing direct connection to the same supply rail without level-shifting. For battery-powered systems, tying EN to VIN provides always-on operation; for periodic wake-up architectures, a microcontroller GPIO can toggle EN to reduce average current during sleep cycles - a key feature leveraged in portable REF2025AIDDCR-based data loggers.
REF2025AIDDCR 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
REF2025AIDDCR FAQ
1.How can I place an order for REF2025AIDDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2025AIDDCR 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 REF2025AIDDCR reliable?
The price and inventory of REF2025AIDDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2025AIDDCR is usually 5 days.
3.What payment methods are accepted for REF2025AIDDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2025AIDDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2025AIDDCR?
REF2025AIDDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2025AIDDCR 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 REF2025AIDDCR?
For technical support, including REF2025AIDDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2025AIDDCR requirements.
6.How does Aetrix verify that REF2025AIDDCR is sourced from the original manufacturer or authorized distributors?
All REF2025AIDDCR 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 REF2025AIDDCR meets industry standards.
7.What is the process for return or replacement of REF2025AIDDCR?
All REF2025AIDDCR units undergo pre-shipment inspection (PSI). If there is an issue with REF2025AIDDCR, 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 REF2025AIDDCR part is unused and in its original packaging.
Return procedure for REF2025AIDDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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