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Texas Instruments THS4281DR
- Part No.:
- THS4281DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4281DR.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,969
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Product details
Overview
THS4281DR from Texas Instruments is a very low-power, rail-to-rail input and output voltage-feedback operational amplifier fabricated in BiCom-II process. 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 current-sensing and ADC buffer applications.
For engineers reviewing the THS4281DR datasheet, THS4281DR pinout, THS4281DR application, or THS4281DR equivalent, key selection criteria include rail-to-rail I/O swing (±150 mV from rails at 1 kΩ), low 12.5 nV/√Hz input voltage noise, 78 ns 0.1% settling time, and operation from 2.7 V single supply to ±7.5 V dual supply.
Technical Context
The THS4281DR uses voltage-feedback architecture with a common-mode input range extending 400 mV beyond the rails-enabling robust high-side current sensing without phase reversal. Its output swings within 150 mV of both supply rails under 1-kΩ load, supporting true single-supply operation in space-constrained portable systems.
It achieves 90 MHz small-signal bandwidth at G = +1 and 40 MHz at G = +2 (5 V supply), with harmonic distortion as low as –92 dBc (second harmonic, 100 kHz, G = +2) and THD+N of 0.0009% at 10 kHz-making it suitable for driving medium-speed SAR ADCs like ADS8320 with minimal signal degradation.
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 - supports wide-input industrial and portable power rails |
| Quiescent Current | 750 μA typical at 5 V - enables >10-year battery life in always-on sensor front-ends |
| Unity-Gain Bandwidth | 90 MHz at 5 V - sufficient for buffering 2 MSPS ADCs and active filters up to ~10 MHz |
| Slew Rate | 35 V/μs - ensures faithful reproduction of fast 2-V step signals with <78 ns 0.1% settling |
| Input Voltage Noise | 12.5 nV/√Hz - preserves SNR in precision gain stages before 16-bit ADCs |
| Rail-to-Rail I/O | Common-mode input extends 400 mV beyond rails; output swings to within 150 mV of rails at 1 kΩ - maximizes dynamic range in low-voltage systems |
| Output Drive | ±30 mA min into 10 Ω - capable of directly driving coaxial cables or multiple parallel loads |
Pinout & Package
THS4281DR is packaged in SOIC-8 (4.90 mm × 3.91 mm), with pins arranged for standard op-amp layout and decoupling. Pin 1 is NC (no internal connection); pin 2 is IN−; pin 3 is IN+; pin 4 is VS−; pin 5 is NC; pin 6 is VOUT; pin 7 is VS+; pin 8 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 2) | Inverting input | Accepts differential input signals; used with feedback network for stable closed-loop gain configuration |
| IN+ (Pin 3) | Non-inverting input | Supports rail-to-rail common-mode range (–0.4 V to 5.4 V at 5 V supply) - enables high-side current sensing |
| VS− (Pin 4) | Negative supply | Connects to ground (single supply) or negative rail (dual supply); must be decoupled with 0.1 µF ceramic capacitor |
| VOUT (Pin 6) | Amplifier output | Delivers rail-to-rail swing (0.15 V to 4.85 V at 5 V, 1 kΩ load); drives ADC inputs or active filter stages |
| VS+ (Pin 7) | Positive supply | Accepts 2.7–15 V; requires local 0.1 µF + 6.8 µF decoupling per datasheet Figure 8.1 |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 400 mV beyond supply rails - eliminates need for level-shifting in high-side current sense topologies |
| Ultra-low quiescent current | 750 μA max at 5 V - reduces thermal load and extends battery runtime in portable instrumentation |
| High-speed settling | 78 ns to 0.1% for 2-V step - meets timing budget for 12.8 MSPS sampling (78 ns ≤ 78 ns period) |
| Low distortion at 100 kHz | –92 dBc second harmonic (G = +2, 5 V) - maintains fidelity in video and communication signal chains |
| Wide supply flexibility | Operates from 2.7 V single supply or ±1.35 V dual supply - compatible with Li-ion, coin-cell, and split-rail systems |
Applications
| Portable Current Monitoring | ADC Driver for Medium-Speed SAR Converters |
|---|---|
Use Scenario: Real-time battery pack current monitoring in handheld medical devices using high-side shunt sensing. IC Role / Device Role / Timing Role: THS4281DR amplifies mV-level shunt voltage with rail-to-rail input capability and minimal offset drift. Use Value: Enables accurate sub-1% current measurement down to 2.7 V supply while consuming <1 mW - critical for multi-day battery life. |
Use Scenario: Driving ADS8320 16-bit, 2.5 MSPS SAR ADC in portable data loggers. IC Role / Device Role / Timing Role: THS4281DR provides low-noise, fast-settling signal conditioning ahead of ADC sample-and-hold. Use Value: 12.5 nV/√Hz noise and 78 ns settling ensure full 16-bit ENOB is preserved without oversampling penalty. |
| High-Channel-Count Sensor Signal Conditioning | Low-Power Active Filter Stage |
Use Scenario: Front-end amplification for 32-channel industrial temperature sensor array powered from 3.3 V rail. IC Role / Device Role / Timing Role: THS4281DR configured as unity-gain buffer isolates RTD bridge outputs and drives multiplexer inputs. Use Value: 750 μA quiescent current per channel allows full 32-channel system to draw <24 mA - fits within 100-mA LDO budget. |
Use Scenario: Second-order Sallen-Key anti-aliasing filter in battery-operated vibration monitor. IC Role / Device Role / Timing Role: THS4281DR implements gain-of-two filter stage with 40 MHz bandwidth and low THD. Use Value: –92 dBc harmonic distortion at 100 kHz prevents aliasing artifacts in FFT-based spectral analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA355DR | Higher quiescent current (2.5 mA), wider bandwidth (200 MHz), no rail-to-rail input - limited high-side sensing capability | Better for high-frequency AC-coupled signal paths; unsuitable for DC-coupled shunt monitoring near supply rails | Choose OPA355DR only when bandwidth >120 MHz is required and supply headroom permits non-rail-to-rail input |
| TLV2462CDR | Lower bandwidth (6.4 MHz), lower quiescent current (550 μA), rail-to-rail I/O - but slower settling (3.5 µs) and higher noise (22 nV/√Hz) | Acceptable for DC/low-frequency sensor buffering; inadequate for >500 kSPS ADC drivers or video | Choose TLV2462CDR only for sub-100 kHz applications where ultra-low power dominates over speed/noise |
Compared with OPA355DR and TLV2462CDR, THS4281DR uniquely balances 90 MHz bandwidth, rail-to-rail input, 750 μA IQ, and 12.5 nV/√Hz noise - making it the only option among the three viable for battery-powered, high-precision, medium-speed signal acquisition.
Availability
THS4281DR is available at Aetrix Electronics and suitable for portable instrumentation, high-channel-count sensor arrays, and medium-speed ADC driver applications requiring stable component supply across extended production lifecycles.
Supply support for THS4281DR 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, embedded processing, and connectivity technologies, with decades of op-amp design heritage and broad industrial qualification.
The THS4281DR belongs to TI's high-speed, low-power op-amp product line, engineered specifically for portable and power-sensitive applications demanding rail-to-rail performance without sacrificing bandwidth or precision.
FAQ
What is the maximum supply voltage for THS4281DR?
The THS4281DR supports a maximum supply voltage of 16.5 V across VS+ to VS−, with recommended operating range up to 15 V single supply or ±7.5 V dual supply. Absolute maximum ratings specify ±8.25 V for dual supplies, and exceeding these limits risks permanent damage per the datasheet Absolute Maximum Ratings table.
Does THS4281DR support true rail-to-rail input operation?
Yes, THS4281DR features rail-to-rail input with common-mode voltage range extending 400 mV beyond both supply rails - e.g., –0.4 V to 5.4 V at 5 V supply. This enables direct high-side current sensing without external level-shifting circuitry, as confirmed in the "Features" and "Electrical Characteristics" sections of the SLOS432B datasheet.
What is the typical quiescent current of THS4281DR at 3 V supply?
At 3 V supply and 25°C, THS4281DR draws 0.75 mA typical quiescent current, with a maximum of 0.98 mA over 0°C to 70°C. This value is explicitly listed in Section 6.5 "Electrical Characteristics, VS = 3 V" of the official datasheet, confirming its suitability for ultra-low-power designs.
Can THS4281DR drive a 150-Ω load in video applications?
Yes, THS4281DR is characterized for differential gain/phase performance into 150-Ω loads at G = +2, achieving 0.11%/0.11° (NTSC) at ±5 V supply. Its 30+ mA output drive capability and low distortion (–92 dBc at 100 kHz) meet standard video line-driving requirements per datasheet Figures 56–59 and AC performance tables.
Is THS4281DR pin-compatible with other SOIC-8 op-amps?
No - THS4281DR has two NC (no-connect) pins (Pins 1, 5, and 8), resulting in a non-standard SOIC-8 pinout distinct from generic op-amps like LM358 or TL072. Its functional pin mapping (IN−, IN+, VS−, VOUT, VS+) differs from industry-standard configurations, requiring dedicated PCB layout per the "Pin Configuration and Functions" diagram in the datasheet.
THS4281DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
THS4281DR FAQ
1.How can I place an order for THS4281DR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4281DR 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 THS4281DR reliable?
The price and inventory of THS4281DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4281DR is usually 5 days.
3.What payment methods are accepted for THS4281DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4281DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4281DR?
THS4281DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4281DR 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 THS4281DR?
For technical support, including THS4281DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4281DR requirements.
6.How does Aetrix verify that THS4281DR is sourced from the original manufacturer or authorized distributors?
All THS4281DR 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 THS4281DR meets industry standards.
7.What is the process for return or replacement of THS4281DR?
All THS4281DR units undergo pre-shipment inspection (PSI). If there is an issue with THS4281DR, 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 THS4281DR part is unused and in its original packaging.
Return procedure for THS4281DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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