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Texas Instruments REF3225AIDBVT
- Part No.:
- REF3225AIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF3225AIDBVT.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,618
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Product details
Overview
REF3225AIDBVT from Texas Instruments is a precision 2.5V bandgap voltage reference IC with 0.01% initial accuracy, 4ppm/°C drift (0°C to +125°C), and ±10mA output drive capability-designed for high-accuracy data acquisition systems requiring stable excitation or ADC reference in portable medical instruments.
For engineers reviewing the REF3225AIDBVT datasheet, REF3225AIDBVT pinout, REF3225AIDBVT application, or REF3225AIDBVT equivalent, key selection criteria include its force-sense architecture for load regulation compensation, ultra-low 110μA quiescent current, 5mV dropout at no load, and SOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The REF3225AIDBVT implements a CMOS-based bandgap core with buffered output and integrated enable/shutdown control. Its dual-ground architecture (GND_F and GND_S) enables Kelvin sensing to reject trace resistance effects, while the ENABLE pin supports digital power sequencing with 0.7V low-threshold shutdown.
It operates from supply voltages as low as VOUT + 5mV (unloaded), maintains stability with any capacitive load, and delivers specified performance across –40°C to +125°C. The device features 33µVPP (0.1–10Hz) noise and 48µVRMS (10Hz–10kHz) noise at 2.5V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.005V (±0.2%) at +25°C - ensures direct compatibility with 2.5V ADC references and microcontroller analog peripherals. |
| Temp Drift (0°C to +125°C) | 4ppm/°C typical - translates to ≤1.25mV total drift over full industrial range, critical for uncalibrated precision measurement. |
| Quiescent Current | 110μA typical - enables >10-year battery life in coin-cell-powered portable instrumentation with minimal self-heating error. |
| Dropout Voltage | 5mV minimum at no load - allows operation from ultra-low headroom supplies such as single Li-ion cells post-regulation. |
| Load Regulation | ±3μV/mA sourcing/sinking - achieved via force-sense (OUT_F/OUT_S and GND_S/GND_F) pins, eliminating PCB trace resistance impact on reference accuracy. |
| Long-Term Stability | 55ppm over 1000 hours - quantifies aging-induced drift for calibration-critical applications like medical diagnostics equipment. |
| PSRR | ≥60dB at 100Hz - suppresses ripple from noisy DC-DC converters feeding the reference, preserving signal integrity in mixed-signal systems. |
Pinout & Package
SOT23-6 (DBV) package: 2.9mm × 2.8mm footprint with gull-wing leads; thermal resistance θJA = 200°C/W; RoHS-compliant NiPdAu lead finish; MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND_F | Analog ground reference | Primary ground return for internal bandgap core and buffer; connects to system power ground plane. |
| 2: GND_S | Analog sense ground | Kelvin sense return for load ground path; must be tied to load ground near OUT_S to enable trace-resistance compensation. |
| 3: ENABLE | Digital input control | Active-high logic input; <0.7V disables output (1μA shutdown current), ≥1.5V enables reference (110μA operating current). |
| 4: IN | Analog power input | Positive supply input; accepts VOUT + 5mV minimum (no load) up to +7.5V absolute max. |
| 5: OUT_S | Analog sense output | Kelvin sense connection to load; ties directly to load-side reference node to close feedback loop for remote sensing. |
| 6: OUT_F | Analog force output | Main regulated output driving load; voltage is actively adjusted based on OUT_S/GND_S feedback to maintain accuracy at remote point. |
Key Features
| Feature | Design Value |
|---|---|
| Force-sense output architecture | Compensates for up to 200mV of trace resistance between reference and load, enabling ±0.001% accuracy at point-of-load without layout constraints. |
| Ultra-low dropout | 5mV minimum headroom allows use with LDOs delivering 2.505V from 2.5V rails-critical for energy-harvesting and battery-backed systems. |
| Stable with any capacitive load | Eliminates need for external compensation capacitors, reducing BOM count and simplifying layout in space-limited portable designs. |
| Low-noise performance | 33µVPP (0.1–10Hz) enables sub-16-bit effective resolution in high-resolution delta-sigma ADCs without additional filtering. |
| Wide temperature specification | –40°C to +125°C operating range supports deployment in automotive under-hood sensors and industrial motor drives. |
Applications
| Portable Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Battery-powered handheld ECG monitor acquiring microvolt-level cardiac signals with 24-bit ADC. IC Role / Device Role / Timing Role: Primary 2.5V reference for ADC and analog front-end PGA, providing excitation and scaling. Use Value: 4ppm/°C drift and 33µVPP noise ensure baseline stability and SNR >105dB over clinical operating temperature range. |
Use Scenario: Industrial PLC analog input module digitizing 4–20mA sensor loops with 18-bit SAR ADC. IC Role / Device Role / Timing Role: Precision reference for ADC and current-loop DAC, referenced to isolated 2.5V domain. Use Value: Force-sense architecture maintains ±0.005% reference accuracy despite 100mΩ PCB trace resistance between module and sensor interface. |
| Test & Measurement Equipment | Medical Imaging Subsystems |
Use Scenario: Benchtop multimeter performing auto-ranging DC voltage measurements with 6½-digit resolution. IC Role / Device Role / Timing Role: Calibration reference source for internal ADC and DMM front-end attenuators. Use Value: 55ppm long-term stability over 1000h reduces recalibration frequency and supports ISO/IEC 17025 traceability requirements. |
Use Scenario: Portable ultrasound probe with integrated beamformer ASIC requiring stable 2.5V bias for time-of-flight timing circuits. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for clock generation and analog timing blocks. Use Value: 110μA quiescent current extends probe battery life while 48µVRMS noise prevents jitter-induced image artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3425ARJZ-R7 | 2.5V, 10ppm/°C max (−40°C to +125°C), 120μA IQ, SOT23-5, no force-sense pins | Lacks Kelvin sensing; requires careful layout to minimize trace resistance errors; better suited for non-critical, cost-sensitive applications | Select when board area is constrained and load regulation error <0.01% is acceptable without remote sensing. |
| MAX6126AASA25+ | 2.5V, 3ppm/°C max (0°C to +70°C), 150μA IQ, SO8, no enable pin, higher cost | Higher accuracy over narrow temp range; no shutdown mode; larger package limits portable use | Select for lab-grade instrumentation where 0°C–70°C operation suffices and ultra-low drift dominates over power or size. |
Compared with ADR3425ARJZ-R7 and MAX6126AASA25+, REF3225AIDBVT uniquely balances ultra-low dropout (5mV), force-sense compensation, and 110μA quiescent current in SOT23-6-making it optimal for battery-powered, high-accuracy systems demanding both precision and compactness.
Availability
REF3225AIDBVT is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial data acquisition systems, and test equipment requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for REF3225AIDBVT 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 analog design and high-reliability manufacturing.
The REF32xx family was engineered specifically for portable and battery-powered instrumentation requiring ultra-low-power, high-accuracy voltage references with robust load regulation-addressing critical needs in medical, test, and industrial measurement markets.
FAQ
What is the minimum supply voltage required for stable operation of the REF3225AIDBVT?
The REF3225AIDBVT requires a minimum supply voltage of VOUT + 5mV (i.e., 2.505V) under no-load conditions. With 10mA load, the dropout increases to ≤50mV, so VIN ≥ 2.55V is recommended for full-load operation across temperature. This ultra-low headroom enables direct use with low-dropout regulators in energy-constrained systems.
How does the force-sense architecture of the REF3225AIDBVT improve reference accuracy?
The REF3225AIDBVT uses separate OUT_F/OUT_S and GND_F/GND_S pins to implement Kelvin sensing: OUT_S and GND_S connect directly at the load, allowing the IC to measure and regulate voltage *at the load point*. This compensates for voltage drop across PCB traces and connectors, maintaining ±0.005% accuracy even with 100mΩ series resistance-unachievable with standard 2-terminal references.
Can the REF3225AIDBVT be used with capacitive loads, and is external compensation required?
Yes, the REF3225AIDBVT is internally compensated and stable with *any* capacitive load-from 0pF to >10µF-without requiring external compensation components. This eliminates layout sensitivity and reduces BOM count, making it ideal for systems where output filtering or long cable runs introduce significant capacitance.
What is the shutdown current of the REF3225AIDBVT, and how is the ENABLE pin controlled?
When the ENABLE pin is held below 0.7V, the REF3225AIDBVT enters shutdown mode with typical current consumption of 0.5μA (max 1μA). The ENABLE pin is a CMOS-compatible digital input: logic high ≥1.5V activates the reference (110μA IQ), and rise time ≤2ms allows direct tie to IN for simple power-on sequencing without external circuitry.
Does the REF3225AIDBVT require a bypass capacitor, and what value is recommended?
A 0.47µF ceramic bypass capacitor is recommended between IN and GND_F, placed as close as possible to the REF3225AIDBVT pins. This stabilizes the input supply against transient currents and improves PSRR-especially critical when powered from switching regulators. No output capacitor is required due to inherent stability with all capacitive loads.
REF3225AIDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 33µVp-p
- Noise - 10Hz to 10kHz:
- 48µVrms
- Voltage - Input:
- 2.55V ~ 5.5V
- Current - Supply:
- 135µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
REF3225AIDBVT FAQ
1.How can I place an order for REF3225AIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3225AIDBVT 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 REF3225AIDBVT reliable?
The price and inventory of REF3225AIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3225AIDBVT is usually 5 days.
3.What payment methods are accepted for REF3225AIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3225AIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3225AIDBVT?
REF3225AIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3225AIDBVT 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 REF3225AIDBVT?
For technical support, including REF3225AIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3225AIDBVT requirements.
6.How does Aetrix verify that REF3225AIDBVT is sourced from the original manufacturer or authorized distributors?
All REF3225AIDBVT 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 REF3225AIDBVT meets industry standards.
7.What is the process for return or replacement of REF3225AIDBVT?
All REF3225AIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with REF3225AIDBVT, 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 REF3225AIDBVT part is unused and in its original packaging.
Return procedure for REF3225AIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3225AIDBVT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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