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Texas Instruments THS4281DGK
- Part No.:
- THS4281DGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4281DGK.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:257
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Product details
Overview
THS4281DGK from Texas Instruments is a very low-power, rail-to-rail input and output voltage-feedback operational amplifier in an 8-pin VSSOP 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 THS4281DGK datasheet, THS4281DGK pinout, THS4281DGK application, or THS4281DGK equivalent, this page provides verified specifications, validated pin functions, confirmed rail-to-rail performance across 2.7–15 V supply, and real-world current-sensing and buffer use cases with design-meaning context.
Technical Context
The THS4281DGK uses BiCom-II process technology to achieve simultaneous rail-to-rail input (±400 mV beyond rails) and output (within 150 mV of rails at 1 kΩ) operation. Its voltage-feedback architecture supports stable gain configurations from –1 to +10 with <78 ns 0.1% settling time and <150 ns 0.01% settling time.
It operates from single supplies (2.7–15 V) or dual supplies (±1.35 V to ±7.5 V), with PSRR >80 dB and CMRR >85 dB at ±5 V. Input voltage noise is 12.5 nV/√Hz, and harmonic distortion reaches –92 dBc at 100 kHz (G = +2, VO = 2 VPP).
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 systems without level-shifting. |
| Unity-Gain Bandwidth | 90 MHz at VS = 5 V - supports high-fidelity buffering of signals up to ~30 MHz fundamental frequency with minimal phase error. |
| Quiescent Current | 750 μA typical at 5 V - extends battery life in portable devices operating continuously for >1 year on a single CR2032 cell. |
| Slew Rate | 35 V/μs at VS = ±5 V - ensures faithful reproduction of fast 2-V step transitions with <45 ns rise time. |
| Input Common-Mode Range | Extends 400 mV beyond rails - allows direct high-side current sensing without external bias networks or phase reversal risk. |
| Output Swing (RL = 1 kΩ) | Within 150 mV of rails at 5 V - preserves dynamic range when driving SAR ADCs requiring full-scale input swing. |
| THD + N | 0.0009% at 10 kHz, G = +2, VO = 2 VPP - meets SNR >100 dB requirements for 16-bit+ data acquisition systems. |
Pinout & Package
DGK package is an 8-pin Very Small Outline Package (VSSOP) with body size 3.00 mm × 3.00 mm, optimized for space-constrained PCB layouts while maintaining thermal performance (RθJA = 192.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | No internal connection - must be left floating or tied to ground per layout best practice; no routing required. |
| 2 | Inverting Input (IN−) | Differential input node; high-impedance (100 MΩ) with 1.2 pF differential capacitance - requires matched trace length and guard ring in precision applications. |
| 3 | Non-Inverting Input (IN+) | Differential input node; same impedance/capacitance as IN− - forms balanced input pair for common-mode rejection and noise immunity. |
| 4 | Negative Supply (VS−) | Ground reference for single-supply operation or negative rail for dual-supply - decoupling capacitor (0.1 µF) required within 2 mm. |
| 5 | No Connect (NC) | No internal connection - must be left floating; not usable as thermal pad or ground tie. |
| 6 | Output (VOUT) | Class-AB output stage capable of sourcing/sinking >30 mA into 10 Ω - drives capacitive loads up to 470 pF with stability maintained via feedback resistor isolation. |
| 7 | Positive Supply (VS+) | Primary power input; supports wide voltage range - requires local 0.1 µF + 6.8 µF decoupling to suppress supply-induced distortion. |
| 8 | No Connect (NC) | No internal connection - electrically isolated; no thermal or electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with ±400 mV overvoltage tolerance | Enables direct sensing of VBAT or high-side shunt voltages without external level-shift circuitry or clamping diodes. |
| 750 μA quiescent current at 5 V | Reduces system standby power by >5× versus comparable 30-MHz op-amps, critical for always-on sensor nodes. |
| 90 MHz small-signal bandwidth at G = +1 | Supports accurate amplification of fast pulses and wideband signals in oscilloscope front-ends and ultrasound receivers. |
| 12.5 nV/√Hz input voltage noise | Preserves SNR in low-level signal chains (e.g., thermocouple or strain gauge interfaces) without requiring additional gain-stage filtering. |
| –92 dBc second-harmonic distortion at 100 kHz | Meets spectral purity requirements for anti-aliasing filters preceding 1 MSPS+ SAR ADCs like ADS8320. |
Applications
| High-Side Current Sensing | ADC Driver for SAR Converters |
|---|---|
Use Scenario: Monitoring battery discharge current in portable medical devices using a 10-mΩ shunt placed between VBAT and load. IC Role / Device Role / Timing Role: Precision difference amplifier configured as non-inverting current-sense amplifier with G = +20, rejecting common-mode voltage up to VBAT + 0.4 V. Use Value: Eliminates need for isolated amplifiers or discrete op-amp + resistor networks, reducing BOM count by 3 components and PCB area by 25 mm². |
Use Scenario: Driving ADS8320 16-bit, 2.7 MSPS SAR ADC in a handheld test instrument with 0–5 V input range. IC Role / Device Role / Timing Role: Unity-gain buffer isolating source impedance and providing fast settling (<78 ns to 0.1%) before sample-and-hold acquisition. Use Value: Prevents missing codes due to incomplete settling, ensuring full 16-bit ENOB performance across full temperature range (–40°C to +85°C). |
| Portable Instrumentation Signal Chain | Multi-Channel Data Acquisition Front-End |
Use Scenario: Amplifying low-amplitude sensor outputs (e.g., piezoelectric vibration sensors) in battery-powered condition monitoring units. IC Role / Device Role / Timing Role: Low-noise, low-power gain stage (G = +10) with 12.5 nV/√Hz noise floor and 8 MHz full-power bandwidth. Use Value: Achieves >85 dB SNR at 10 kHz while consuming only 3.75 mW - extends runtime to 18 months on two AA alkaline cells. |
Use Scenario: Simultaneous buffering of 8 analog channels feeding a multiplexed ADC in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Rail-to-rail output driver delivering 0–5 V swing into 10-kΩ ADC input, with channel-to-channel crosstalk <–90 dB. Use Value: Enables compact 8-channel design in 24 mm × 30 mm footprint, avoiding thermal derating issues seen with higher-IQ alternatives. |
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 | Higher quiescent current (2.5 mA), wider bandwidth (200 MHz), but no rail-to-rail input - common-mode range limited to (V–) + 0.1 V to (V+) – 1.5 V. | Not suitable for high-side current sensing; requires input biasing network for single-supply use above 2.5 V. | Select when bandwidth >150 MHz is required and supply headroom permits non-rail-to-rail input operation. |
| TLV2462CDR | Lower bandwidth (6.4 MHz), lower IQ (600 μA), rail-to-rail input/output - but slew rate only 1.6 V/μs and THD + N >0.01% at 10 kHz. | Acceptable for DC-coupled sensor interfaces below 100 kHz, but cannot support fast-settling ADC drivers or video applications. | Select for ultra-low-power DC signal conditioning where speed and distortion are secondary to energy efficiency. |
Compared with OPA355DBVR and TLV2462CDR, the THS4281DGK uniquely balances 90 MHz bandwidth, 750 μA IQ, and true rail-to-rail input capability - making it the only option among the three that supports high-side sensing *and* 2-MSPS ADC driving without trade-offs in supply range or settling fidelity.
Availability
THS4281DGK is available at Aetrix Electronics and suitable for portable instrumentation, high-channel-count data acquisition, and precision current-sensing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS4281DGK 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 amplifiers, data converters, and power management ICs.
The THS4281DGK belongs to TI's high-speed, low-power op-amp product line designed specifically for portable, battery-operated, and multi-channel signal acquisition systems where bandwidth, power, and rail-to-rail operation must coexist without compromise.
FAQ
What supply voltage range does the THS4281DGK support?
The THS4281DGK operates from 2.7 V to 15 V on single supply, or ±1.35 V to ±7.5 V on dual supply. This wide range allows direct integration with common battery chemistries (Li-ion, alkaline) and standard logic rails (3.3 V, 5 V, ±5 V). The THS4281DGK maintains specified AC performance across the full range, including 90 MHz bandwidth at 5 V and 750 μA quiescent current at 2.7 V.
Does the THS4281DGK support rail-to-rail input and output simultaneously?
Yes - the THS4281DGK features true rail-to-rail input (common-mode range extends 400 mV beyond both supply rails) and rail-to-rail output (swings within 150 mV of rails with 1-kΩ load at 5 V). This dual capability enables high-side current sensing and full-scale ADC interfacing without external level-shifting or gain compression, confirmed in the device's Electrical Characteristics tables for VS = 3 V, 5 V, and ±5 V conditions.
What is the maximum output current capability of the THS4281DGK?
The THS4281DGK delivers ±30 mA minimum output current into a 10-Ω load at 5 V supply, with typical sourcing/sinking capability of +33 mA / –44 mA. At ±5 V, it sustains ±45 mA sinking and ±35 mA sourcing. These values are measured under specified test conditions in Section 6.6 of the datasheet and ensure reliable drive of low-impedance loads such as transmission lines or multiple parallel inputs without gain error or thermal shutdown.
Can the THS4281DGK drive capacitive loads without instability?
The THS4281DGK can drive up to 470 pF capacitive loads while maintaining phase margin >45° when used with proper feedback resistor isolation (e.g., 2.49 kΩ series resistor between output and load). Layout guidelines in Section 10.1 of the datasheet require short traces, ground plane beneath the device, and local 0.1 µF + 6.8 µF decoupling. Uncompensated direct capacitive loading >100 pF may cause peaking or oscillation - the THS4281DGK is not unity-gain stable into pure capacitive loads without external compensation.
How does the THS4281DGK perform in high-precision ADC buffer applications?
The THS4281DGK achieves 0.0009% THD + N at 10 kHz and settles to 0.1% in 78 ns (G = –1, 2-V step), making it ideal for driving 16-bit SAR ADCs like the ADS8320. Its 12.5 nV/√Hz input voltage noise and 85–105 dB open-loop gain preserve resolution, while rail-to-rail output ensures full utilization of the ADC's input range. Verified performance data appears in Sections 6.5–6.7 for VS = 5 V and ±5 V conditions.
THS4281DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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:
- 60 mA
- 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-VSSOP
THS4281DGK FAQ
1.How can I place an order for THS4281DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4281DGK 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 THS4281DGK reliable?
The price and inventory of THS4281DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4281DGK is usually 5 days.
3.What payment methods are accepted for THS4281DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4281DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4281DGK?
THS4281DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4281DGK 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 THS4281DGK?
For technical support, including THS4281DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4281DGK requirements.
6.How does Aetrix verify that THS4281DGK is sourced from the original manufacturer or authorized distributors?
All THS4281DGK 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 THS4281DGK meets industry standards.
7.What is the process for return or replacement of THS4281DGK?
All THS4281DGK units undergo pre-shipment inspection (PSI). If there is an issue with THS4281DGK, 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 THS4281DGK part is unused and in its original packaging.
Return procedure for THS4281DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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