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Texas Instruments THS4281DBVR
- Part No.:
- THS4281DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
THS4281DBVR.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
THS4281DBVR from Texas Instruments is a very low-power, rail-to-rail input and output voltage-feedback operational amplifier in a 5-pin SOT-23 package. It delivers 90 MHz unity-gain bandwidth, 35 V/μs slew rate, and 750 μA quiescent current at 5 V, enabling high-speed signal conditioning in battery-powered portable instrumentation and ADC front-ends.
For engineers reviewing the THS4281DBVR datasheet, THS4281DBVR pinout, THS4281DBVR application, or THS4281DBVR equivalent, key selection considerations include its 400 mV beyond-rail common-mode input range for high-side current sensing, 150 mV rail-to-rail output swing into 1 kΩ, and guaranteed performance from –40°C to +85°C with <1 mA max quiescent current over temperature.
Technical Context
The THS4281DBVR uses BiCom-II process technology to achieve simultaneous rail-to-rail input (–0.4 V to 5.4 V at 5 V supply) and output (0.15 V to 4.85 V into 1 kΩ) operation. Its voltage-feedback architecture provides stable gain configurations from –10 to +10 with minimal phase shift up to 40 MHz at G = +2.
Designed for single-supply systems, it supports 2.7 V to 15 V operation and exhibits 85 dB typical CMRR and 105 dB open-loop gain at 5 V. The amplifier maintains 78 ns 0.1% settling time on 2-V steps and –92 dBc second-harmonic distortion at 100 kHz with 2 VPP output-critical for driving 12-bit+ SAR ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 15 V single supply; ±1.35 V to ±7.5 V dual supply - enables direct interface with Li-ion, 3.3 V, and 5 V logic domains |
| Quiescent Current | 750 μA typ at 5 V, ≤1 mA max over –40°C to +85°C - extends battery life in portable medical and handheld test equipment |
| Unity-Gain Bandwidth | 90 MHz at 5 V - supports >2 MSPS sampling of sensor signals without bandwidth limitation |
| Slew Rate | 35 V/μs at 5 V - ensures faithful reproduction of fast transients in pulse-amplification and active filter stages |
| Input Offset Voltage | 2.5 mV max at +25°C - minimizes DC error in precision current-sensing and low-level signal amplification |
| Output Swing | 0.15 V to 4.85 V into 1 kΩ at 5 V - delivers full dynamic range to ADCs with 0–5 V input ranges |
| Common-Mode Input Range | –0.4 V to 5.4 V at 5 V supply - allows high-side current sensing above VS+ without phase reversal |
Pinout & Package
THS4281DBVR is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm body size) optimized for space-constrained PCB layouts. Thermal resistance RθJA is 154.4°C/W, requiring minimal copper area for thermal management in continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Output | Amplified differential output node; drives loads ≥10 Ω with 33 mA sink/source capability at 5 V |
| 2 - VS− | Negative Supply | Ground reference for single-supply operation or negative rail for dual-supply use; must be decoupled with 0.1 µF ceramic |
| 3 - IN+ | Non-inverting Input | High-impedance (100 MΩ) positive input; accepts signals up to 400 mV beyond rails for high-side sensing |
| 4 - IN− | Inverting Input | Differential input node; used with feedback network to set closed-loop gain and bandwidth |
| 5 - VS+ | Positive Supply | Main power input; supports 2.7–15 V; requires local 0.1 µF + 6.8 µF decoupling per datasheet Figure 27 |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling across entire supply range - eliminates level-shifting circuitry in 3.3 V/5 V systems |
| 750 μA quiescent current | Reduces system power budget by >50% vs comparable 100 MHz op-amps - critical for multi-channel portable data loggers |
| 90 MHz unity-gain bandwidth | Supports wideband applications including ultrasound front-ends and high-resolution oscilloscope channels |
| 78 ns 0.1% settling time | Meets timing requirements for 12-bit SAR ADCs sampling at 10 MSPS with minimal acquisition window overhead |
| –92 dBc harmonic distortion at 100 kHz | Preserves SNR in precision measurement chains - suitable for driving ADS8320 and similar 16-bit ADCs |
Applications
| Portable ECG Monitor Front-End | High-Channel-Count Data Acquisition |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes under battery-powered operation. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail input buffer preceding anti-aliasing filter and 16-bit SAR ADC. Use Value: 12.5 nV/√Hz input voltage noise and 750 μA IQ enable >90 dB SNR and >72-hour runtime on two AA cells. |
Use Scenario: Simultaneous buffering of 32 analog sensor outputs in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Unity-gain follower for impedance isolation and drive strength enhancement before multiplexing. Use Value: 90 MHz bandwidth and 35 V/μs slew rate ensure <10 ns channel-to-channel skew during fast multiplexed sampling. |
| High-Side Current Sensing | ADC Driver for ADS8320 |
|
Use Scenario: Measuring load current in 5 V power rails using shunt resistor placed between supply and load. IC Role / Device Role / Timing Role: Difference amplifier configured for high-side sensing with common-mode rejection. Use Value: 400 mV beyond-rail input range allows direct connection to VBAT node without level-shifting, reducing BOM count by one IC. |
Use Scenario: Driving the switched-capacitor input of TI's ADS8320 16-bit, 2.7 MSPS SAR ADC in precision test equipment. IC Role / Device Role / Timing Role: High-speed, low-distortion buffer with matched output impedance for optimal charge transfer. Use Value: –92 dBc THD at 100 kHz and 78 ns settling meet ADS8320's 16-bit effective resolution requirement at full sample rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-feedback operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA355DBVR | Lower 50 MHz GBW, 2.5 mA IQ, same SOT-23-5 package | Higher power consumption limits use in multi-channel ultra-low-power systems | Select when lower cost and adequate bandwidth suffice; avoid where <1 mA IQ is mandatory |
| LMH6612MMX | Higher 130 MHz GBW, 2.3 mA IQ, MSOP-8 package | Larger footprint and higher supply current preclude drop-in replacement in space/power-constrained designs | Choose for higher speed where board area and battery life are secondary to bandwidth |
Compared with OPA355DBVR and LMH6612MMX, THS4281DBVR uniquely balances 90 MHz bandwidth with sub-1 mA quiescent current in a 5-pin SOT-23, making it the only option meeting both high-speed and ultra-low-power requirements in portable instrumentation.
Availability
THS4281DBVR is available at Aetrix Electronics and suitable for portable medical devices, high-channel-count DAQ systems, and high-side current-sensing applications requiring stable component supply and long-term production continuity.
Supply support for THS4281DBVR 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 delivering analog and embedded processing solutions with emphasis on power efficiency, precision, and reliability.
The THS4281DBVR belongs to TI's high-speed, low-power op-amp product line designed specifically for portable instrumentation, battery-powered test equipment, and precision signal conditioning where bandwidth and quiescent current must co-optimize.
FAQ
What is the maximum supply voltage for THS4281DBVR?
The THS4281DBVR supports a maximum supply voltage of 16.5 V across VS+ and VS−. At 5 V single supply, its absolute maximum rating is 16.5 V, and in dual-supply mode, it operates up to ±8.25 V. Exceeding these limits risks permanent damage per the Absolute Maximum Ratings table in the THS4281DBVR datasheet.
Does THS4281DBVR support rail-to-rail input at 3 V supply?
Yes, THS4281DBVR supports rail-to-rail input at 3 V supply, with a common-mode input range of –0.3 V to 3.3 V at +25°C. This extends 400 mV beyond both rails, enabling high-side sensing applications even at minimum operating voltage - confirmed in Section 6.5 of the THS4281DBVR datasheet.
Can THS4281DBVR drive a 150 Ω load for video applications?
Yes, THS4281DBVR is characterized for video applications with differential gain/phase of 0.11%/0.11° at 5 V supply into 150 Ω, meeting NTSC/PAL broadcast standards. Its 35 V/μs slew rate and 90 MHz bandwidth ensure minimal distortion on composite video waveforms - verified in Section 6.6 AC Performance tables for THS4281DBVR.
What is the thermal resistance of THS4281DBVR in SOT-23 package?
The THS4281DBVR in DBV (SOT-23) package has a junction-to-ambient thermal resistance (RθJA) of 154.4°C/W, as specified in Table 6.4 of the THS4281DBVR datasheet. This value assumes JEDEC High-K test PCB conditions; actual board layout will affect real-world thermal performance.
Is THS4281DBVR suitable for driving the ADS8320 ADC?
Yes, THS4281DBVR is explicitly recommended for driving the ADS8320 ADC. Its 78 ns 0.1% settling time, –92 dBc THD at 100 kHz, and rail-to-rail output swing match ADS8320's 16-bit resolution and 2.7 MSPS sampling requirements - stated in the THS4281DBVR Applications section and validated in typical application circuits.
THS4281DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 95 MHz
- Current - Input Bias:
- 500 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 800µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 16.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
THS4281DBVR FAQ
1.How can I place an order for THS4281DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4281DBVR 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 THS4281DBVR reliable?
The price and inventory of THS4281DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4281DBVR is usually 5 days.
3.What payment methods are accepted for THS4281DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4281DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4281DBVR?
THS4281DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4281DBVR 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 THS4281DBVR?
For technical support, including THS4281DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4281DBVR requirements.
6.How does Aetrix verify that THS4281DBVR is sourced from the original manufacturer or authorized distributors?
All THS4281DBVR 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 THS4281DBVR meets industry standards.
7.What is the process for return or replacement of THS4281DBVR?
All THS4281DBVR units undergo pre-shipment inspection (PSI). If there is an issue with THS4281DBVR, 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 THS4281DBVR part is unused and in its original packaging.
Return procedure for THS4281DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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