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Texas Instruments REF2125IDBVR
- Part No.:
- REF2125IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
REF2125IDBVR.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,247
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Product details
Overview
REF2125IDBVR from Texas Instruments is a precision CMOS series voltage reference delivering 2.5 V output with ±0.05% initial accuracy, 6 ppm/°C max temperature coefficient, and 5 µVPP/V (0.1–10 Hz) low-frequency noise - enabling high-resolution data acquisition in industrial instrumentation and 4–20 mA loop sensors.
For engineers reviewing the REF2125IDBVR datasheet, REF2125IDBVR pinout, REF2125IDBVR application, or REF2125IDBVR equivalent, key selection criteria include clean-start capability (via CS pin), ±10 mA load drive, 95 µA max quiescent current, and SOT-23-5 packaging for space-constrained analog signal chains.
Technical Context
The REF2125IDBVR integrates a bandgap core with buffered output and digital enable logic, supporting active and shutdown modes via the EN pin. Its clean-start circuitry uses external RC on the CS pin to limit inrush current during power-up, critical for loop-powered systems with inductive supplies.
It operates across −40°C to +125°C with <100 mV dropout at full load, maintains 30 ppm/1000 hrs long-term stability, and achieves thermal hysteresis of ≤30 ppm (Cycle 1) and ≤10 ppm (Cycle 2) - ensuring repeatable performance after temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal - stable reference for ADCs, DACs, and sensor signal conditioning circuits. |
| Initial Accuracy | ±0.05% max - enables 16-bit+ system accuracy without calibration. |
| Temp Coefficient | 6 ppm/°C max - ensures ≤150 ppm total drift over −40°C to +125°C operating range. |
| Quiescent Current | 95 µA max - supports battery-powered and energy-sensitive applications. |
| Output Noise | 5 µVPP/V (0.1–10 Hz) - preserves SNR in high-resolution (≥24-bit) delta-sigma converters like ADS1287. |
| Load Drive | ±10 mA - sufficient to drive ADC reference inputs, op-amp bias networks, and small loads directly. |
| Clean Start | CS pin configurable - limits inrush current using external resistor/capacitor to prevent supply dip in 4–20 mA loops. |
Pinout & Package
REF2125IDBVR is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm body size), optimized for compact PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Logic-high (≥1.6 V) activates reference; logic-low (≤0.5 V) places device in shutdown (<2.5 µA IQ). |
| 2 - VIN | Input supply connection | Accepts 2.55 V to 12 V; dropout as low as 50 mV at zero load enables operation from low-headroom rails. |
| 3 - CS | Clean start configuration | External R/C sets peak inrush current during startup - prevents supply sag in loop-powered transmitters. |
| 4 - VOUT | Precision reference output | 2.5 V ±0.05%, low-noise, ±10 mA capable - drives ADC REF pins, PGA bias, or feedback networks. |
| 5 - GND | Analog ground reference | Must be connected to low-impedance system ground; separates reference return from noisy digital/power grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Clean Start Control | Configurable inrush limiting via CS pin - eliminates startup overshoot and supply rail collapse in 4–20 mA field devices. |
| Low 1/f Noise | 5 µVPP/V (0.1–10 Hz) - minimizes quantization error in precision delta-sigma converters such as ADS1287. |
| Wide Temp Range | Specified from −40°C to +125°C - suitable for uncooled industrial PLC modules and outdoor field transmitters. |
| Shutdown Mode | 2.5 µA max IQ in shutdown - enables power-gating in portable test equipment and battery-backed monitoring systems. |
| Long-Term Stability | 30 ppm/1000 hrs - reduces calibration frequency in metrology-grade instruments and lab-grade data loggers. |
Applications
| PLC Analog Input Modules | 4–20 mA Loop-Powered Transmitters |
|---|---|
|
Use Scenario: High-channel-count programmable logic controller modules acquiring thermocouple, RTD, and voltage signals with 24-bit resolution. IC Role / Device Role / Timing Role: Primary voltage reference for successive-approximation and delta-sigma ADCs (e.g., ADS1287), providing stable 2.5 V reference with ultra-low drift and noise. Use Value: Enables <±0.01% total unadjusted error over temperature without per-channel calibration, reducing BOM cost and firmware complexity. |
Use Scenario: Two-wire field transmitters powering internal circuitry from 4–20 mA loop while delivering precise sensor readings. IC Role / Device Role / Timing Role: Low-quiescent-current (95 µA), clean-start-enabled reference supplying excitation and ADC reference for pressure/temperature sensing front-ends. Use Value: Prevents supply dip during startup and maintains accuracy under varying loop current - eliminating measurement glitches during commissioning or wake-up. |
| Portable Precision Test Equipment | Industrial LCR Meters |
|
Use Scenario: Battery-operated handheld multimeters and calibrators requiring stable reference over extended operating time and wide ambient temperatures. IC Role / Device Role / Timing Role: Main system reference for dual-slope or sigma-delta conversion architectures, powered from single-cell Li-ion or alkaline sources. Use Value: 95 µA max IQ and shutdown mode extend battery life; 6 ppm/°C drift ensures reading consistency across operating environments. |
Use Scenario: Benchtop LCR meters measuring component impedance with sub-0.1% accuracy across frequency sweeps and temperature variations. IC Role / Device Role / Timing Role: Reference source for precision AC excitation generation and synchronous demodulation circuitry, demanding low noise and minimal hysteresis. Use Value: 30 ppm thermal hysteresis (Cycle 2) and 5 µVPP/V noise ensure repeatable measurements before/after thermal cycling - critical for traceable calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3425RTCT | 2.5 V, ±0.025% initial accuracy, 3 ppm/°C drift, 1.2 mA IQ, 6-pin WSON package | Higher accuracy and lower drift, but 12× higher quiescent current - unsuitable for battery operation | Select when ultimate DC precision outweighs power budget; not drop-in due to different pinout and footprint. |
| ADR3425ARTZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C drift, 120 µA IQ, SOT-23-5 package | Looser accuracy and higher drift, but same package and pin-compatible - no PCB change required | Choose for cost-sensitive designs where ±0.1% tolerance is acceptable and clean-start is not needed. |
Compared with REF2125IDBVR, REF3425RTCT offers superior accuracy and drift at the expense of power and layout compatibility, while ADR3425ARTZ-R7 provides pin-for-pin replacement with relaxed specs - making it viable for legacy redesigns where clean-start is unused.
Availability
REF2125IDBVR is available at Aetrix Electronics and suitable for precision data acquisition systems, industrial field transmitters, and portable test equipment requiring stable component supply, long-term calibration integrity, and low-power operation.
Supply support for REF2125IDBVR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The REF21xx family was designed specifically for high-accuracy, low-drift voltage references in harsh industrial environments - emphasizing clean-start capability, wide temperature operation, and noise performance for data converter interfaces.
FAQ
What is the maximum input voltage for REF2125IDBVR?
The REF2125IDBVR supports an absolute maximum input voltage of 13 V, with recommended operation up to 12 V. Exceeding 13 V risks permanent damage. At 12 V input, the device delivers full ±10 mA load capability while maintaining 95 µA max quiescent current - making REF2125IDBVR suitable for wide-input industrial power rails.
Does REF2125IDBVR require external capacitors, and if so, what values?
Yes - REF2125IDBVR requires a minimum 0.1 µF ceramic capacitor on VOUT for stability, and a 1 µF–10 µF capacitor on VIN for transient suppression. The datasheet recommends adding a parallel 0.1 µF ceramic cap on VIN to reduce high-frequency noise. These values are validated across −40°C to +125°C and ensure reliable operation with REF2125IDBVR's clean-start and low-noise features.
How does the clean-start feature work on REF2125IDBVR?
The clean-start feature on REF2125IDBVR uses the CS pin to limit inrush current during power-up. Connecting an external resistor (e.g., 500 kΩ) or RC network to CS sets the peak current between 0.5 mA and 19 mA. This prevents supply voltage dip in loop-powered transmitters - a key behavior confirmed in REF2125IDBVR's functional block diagram and startup timing specifications (tON = 2.5 ms).
Can REF2125IDBVR be used in shutdown mode, and what is its shutdown current?
Yes - pulling the EN pin ≤0.5 V places REF2125IDBVR in shutdown mode, reducing quiescent current to ≤2.5 µA (typical 2.2 µA). In this state, VOUT enters high-impedance mode. This feature is fully characterized across −40°C to +125°C and enables power gating in portable instruments - a verified capability documented in REF2125IDBVR's Electrical Characteristics table.
Is REF2125IDBVR pin-compatible with other SOT-23-5 voltage references?
REF2125IDBVR uses a non-standard pinout: EN (1), VIN (2), CS (3), VOUT (4), GND (5). It is not pin-compatible with common SOT-23-5 references like REF3025 or ADR3425 - those place GND on Pin 1 and VOUT on Pin 4. However, ADR3425ARTZ-R7 shares identical pin numbering and function mapping, making it a verified pin-compatible alternative for designs omitting clean-start functionality.
REF2125IDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 5µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 3V ~ 12V
- Current - Supply:
- 95µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
REF2125IDBVR FAQ
1.How can I place an order for REF2125IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2125IDBVR 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 REF2125IDBVR reliable?
The price and inventory of REF2125IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2125IDBVR is usually 5 days.
3.What payment methods are accepted for REF2125IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2125IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2125IDBVR?
REF2125IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2125IDBVR 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 REF2125IDBVR?
For technical support, including REF2125IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2125IDBVR requirements.
6.How does Aetrix verify that REF2125IDBVR is sourced from the original manufacturer or authorized distributors?
All REF2125IDBVR 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 REF2125IDBVR meets industry standards.
7.What is the process for return or replacement of REF2125IDBVR?
All REF2125IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF2125IDBVR, 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 REF2125IDBVR part is unused and in its original packaging.
Return procedure for REF2125IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF2125IDBVR Tags
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