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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments THS4281D

Name: THS4281D
Brand: Texas Instruments
SKU: THS4281D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: THS4281D

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: THS4281D.pdf

Description:: IC VOLTAGE FEEDBACK 1 CIRC 8SOIC

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Product details

Overview

THS4281D 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 portable systems and high-channel-count data acquisition front-ends.

For engineers reviewing the THS4281D datasheet, THS4281D pinout, THS4281D application, or THS4281D equivalent, key selection criteria include its rail-to-rail I/O capability (±400 mV common-mode extension, 150 mV output headroom), low distortion (–92 dBc @ 100 kHz, G = +2), and compatibility with 2.7–15 V single or ±1.35–±7.5 V dual supplies for ADC buffering, active filtering, and high-side current sensing.

Technical Context

The THS4281D employs a voltage-feedback architecture optimized for low power without sacrificing speed-achieving 90 MHz bandwidth and 78 ns 0.1% settling time while consuming under 0.9 mA across –40°C to +85°C. Its rail-to-rail input stage extends 400 mV beyond supply rails, eliminating phase reversal in high-side current-sense configurations where V_IN+ may exceed V_S+.

Output stage drives ≥30 mA into 10 Ω loads and swings within 150 mV of rails at 1 kΩ, supporting direct interfacing with SAR ADCs sampling ≤2 MSPS. Low 12.5 nV/√Hz input voltage noise and –92 dBc harmonic distortion at 100 kHz ensure fidelity in precision analog signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7–15 V single or ±1.35–±7.5 V dual - supports direct integration into 3.3 V, 5 V, and ±5 V systems without level-shifting.
Unity-Gain Bandwidth	90 MHz at V_S = 5 V - enables stable gain-of-1 buffering of fast signals up to ~30 MHz with <0.1 dB flatness.
Quiescent Current	750 μA typical at 5 V - extends battery life in portable instrumentation and sensor nodes with minimal performance trade-off.
Slew Rate	35 V/μs - ensures faithful reproduction of 2-V step inputs with 78 ns 0.1% settling, critical for pulse and transient capture.
Input Common-Mode Range	Extends 400 mV beyond rails - permits high-side current sensing with V_IN+ tied directly to V_BAT without external biasing.
Output Swing (1 kΩ)	Within 150 mV of rails at 5 V - maintains dynamic range when driving ADC reference buffers or low-voltage logic interfaces.
Harmonic Distortion	–92 dBc @ 100 kHz, G = +2 - meets SNR requirements for 16-bit+ ADC drivers in medical and test equipment.

Pinout & Package

THS4281D is packaged in an 8-pin SOIC (D package) with nominal body size 4.90 mm × 3.91 mm, optimized for thermal dissipation (R_θJA = 126.6 °C/W) and board-level reliability in industrial environments.

Pin	Circuit Role	Design Meaning
1	IN+	Non-inverting input - accepts rail-to-rail signals including those exceeding V_S+ by up to 400 mV in high-side sensing.
2	IN−	Inverting input - used for feedback network connection; high CMRR (85 dB min) rejects supply noise.
3	NC	No internal connection - must be left unconnected; not usable as bypass or thermal pad.
4	V_S−	Negative supply pin - functions as ground in single-supply mode; supports dual ±1.35 V operation.
5	NC	No internal connection - electrically isolated; no routing or grounding required.
6	V_OUT	Amplified output - delivers >30 mA sink/source into 10 Ω, enabling direct drive of low-impedance loads.
7	V_S+	Positive supply pin - accepts up to 15 V; PSRR >80 dB minimizes supply ripple coupling into output.
8	NC	No internal connection - floating terminal; PCB layout must avoid parasitic coupling.

Key Features

Feature	Design Value
Rail-to-rail input	Common-mode range extends 400 mV beyond V_S−/V_S+, enabling direct high-side current sensing without external level shifters.
Rail-to-rail output	Swings to within 150 mV of rails at 1 kΩ load, preserving full-scale signal swing into ADC input networks.
Low distortion	–92 dBc second-harmonic distortion at 100 kHz (G = +2) supports high-fidelity signal conditioning for 16-bit+ converters.
Fast settling	78 ns to 0.1% for 2-V step ensures accurate sampling in multiplexed data acquisition systems with tight timing budgets.
Low noise	12.5 nV/√Hz input voltage noise at 100 kHz maintains SNR integrity in low-amplitude sensor signal amplification.

Applications

Portable Instrumentation	High-Channel-Count DAQ
Use Scenario: Handheld multimeter front-end amplifying microvolt-level thermocouple or bridge sensor outputs under 3.3 V battery power. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail I/O, minimizing external bias components and supply headroom. Use Value: 750 μA quiescent current extends battery life >2× versus comparable 100-MHz op-amps; 2.5 mV max offset ensures <0.1% measurement error.	Use Scenario: Channel multiplexer buffer in 32-channel industrial PLC analog input module operating from 5 V rail. IC Role / Device Role / Timing Role: High-speed, low-crosstalk buffer isolating multiplexer output from ADC input, settling in 78 ns per channel. Use Value: 90 MHz bandwidth and 0.1% settling enable 12.8 MSPS aggregate sampling across 32 channels; SOIC package simplifies automated assembly.
ADC Driver	Active Filter
Use Scenario: Driving ADS8320 16-bit SAR ADC in portable data logger with 2 MSPS sampling requirement. IC Role / Device Role / Timing Role: Gain-of-2 buffer between anti-alias filter and ADC input, providing low-impedance drive and distortion-limited settling. Use Value: –92 dBc distortion at 100 kHz preserves ENOB >15 bits; rail-to-rail output ensures full 0–5 V ADC input range utilization.	Use Scenario: 4th-order Butterworth low-pass filter stage in ultrasound receive path requiring 10 MHz passband and low group delay variation. IC Role / Device Role / Timing Role: Unity-gain stable voltage-feedback amplifier implementing filter pole placement with minimal phase shift. Use Value: 90 MHz GBW supports filter design up to 10 MHz with <0.5° phase error; 35 V/μs slew rate prevents pulse distortion in echo envelope detection.

Portable Instrumentation

High-Channel-Count DAQ

Use Scenario: Handheld multimeter front-end amplifying microvolt-level thermocouple or bridge sensor outputs under 3.3 V battery power.

IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail I/O, minimizing external bias components and supply headroom.

Use Value: 750 μA quiescent current extends battery life >2× versus comparable 100-MHz op-amps; 2.5 mV max offset ensures <0.1% measurement error.

Use Scenario: Channel multiplexer buffer in 32-channel industrial PLC analog input module operating from 5 V rail.

IC Role / Device Role / Timing Role: High-speed, low-crosstalk buffer isolating multiplexer output from ADC input, settling in 78 ns per channel.

Use Value: 90 MHz bandwidth and 0.1% settling enable 12.8 MSPS aggregate sampling across 32 channels; SOIC package simplifies automated assembly.

ADC Driver

Active Filter

Use Scenario: Driving ADS8320 16-bit SAR ADC in portable data logger with 2 MSPS sampling requirement.

IC Role / Device Role / Timing Role: Gain-of-2 buffer between anti-alias filter and ADC input, providing low-impedance drive and distortion-limited settling.

Use Value: –92 dBc distortion at 100 kHz preserves ENOB >15 bits; rail-to-rail output ensures full 0–5 V ADC input range utilization.

Use Scenario: 4th-order Butterworth low-pass filter stage in ultrasound receive path requiring 10 MHz passband and low group delay variation.

IC Role / Device Role / Timing Role: Unity-gain stable voltage-feedback amplifier implementing filter pole placement with minimal phase shift.

Use Value: 90 MHz GBW supports filter design up to 10 MHz with <0.5° phase error; 35 V/μs slew rate prevents pulse distortion in echo envelope detection.

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 quiescent current (2.6 mA vs 0.75 mA), higher bandwidth (200 MHz), but only 100 mV output headroom at 1 kΩ.	Preferred for ultra-high-speed (>100 MHz) applications where power is secondary; less suitable for rail-to-rail output-critical ADC buffering.	Select THS4281D when 150 mV output swing margin and sub-1 mA IQ are mandatory; choose OPA355DBVR only if bandwidth >150 MHz is required.
LMH6612MMX	Higher quiescent current (2.3 mA), wider supply range (2.7–12.6 V), but no rail-to-rail input (CMVR = –0.2 to V_S–1.2 V).	Applicable in non-high-side sensing roles like post-filter amplification; cannot replace THS4281D in V_BAT-referenced current sense.	Use LMH6612MMX only in single-supply applications where input stays >0.2 V above ground; THS4281D remains sole choice for true rail-to-rail input operation.

Compared with OPA355DBVR and LMH6612MMX, the THS4281D uniquely combines sub-1 mA quiescent current, 90 MHz bandwidth, and full rail-to-rail input/output-making it irreplaceable in portable, high-precision, high-side sensing designs where power, swing margin, and input range are simultaneously constrained.

Availability

THS4281D is available at Aetrix Electronics and suitable for portable instrumentation, high-channel-count data acquisition, and ADC driver applications requiring stable component supply with long-term industrial lifecycle support.

Supply support for THS4281D 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 high-performance op-amp design and manufacturing.

The THS4281D belongs to TI's precision high-speed op-amp product line, engineered specifically for low-power, rail-to-rail signal conditioning in portable, medical, and industrial data acquisition systems.

FAQ

What is the maximum supply voltage rating for the THS4281D?

The THS4281D supports a maximum supply voltage of 16.5 V across V_S+ and V_S−, whether operated from a single 16.5 V rail or dual ±8.25 V supplies. Absolute maximum ratings specify ±VS ± 0.5 V on inputs, and continuous operation is rated up to 15 V for robust long-term reliability. Exceeding 16.5 V risks permanent damage per the absolute maximum ratings table in the THS4281D datasheet.

Does the THS4281D support true rail-to-rail input operation?

Yes, the THS4281D features a true rail-to-rail input stage that extends 400 mV beyond both supply rails - for example, with V_S− = 0 V and V_S+ = 5 V, the common-mode input range is –0.4 V to +5.4 V. This allows direct connection of IN+ to V_BAT in high-side current-sensing circuits without external level-shifting circuitry, a capability confirmed in the THS4281D datasheet Section 6.6 and Figure 2.

What is the typical output voltage swing of the THS4281D into a 1-kΩ load at 5 V supply?

At V_S = 5 V and T_A = 25°C, the THS4281D delivers an output voltage swing of 0.25 V to 4.75 V into a 1-kΩ load - i.e., within 250 mV of each rail. The datasheet specifies 0.25/4.75 V (min/max) over temperature (–40°C to +85°C), confirming reliable rail-to-rail output behavior essential for driving 16-bit ADCs like the ADS8320 referenced in THS4281D application examples.

Can the THS4281D drive a 10-Ω load effectively?

Yes, the THS4281D is specified to source and sink >30 mA into a 10-Ω load at 5 V supply - delivering ±0.3 V minimum swing (±0.3 V = 30 mA × 10 Ω). Electrical Characteristics tables confirm 24–33 mA sourcing and 30–44 mA sinking capability at 25°C, making it suitable for low-impedance active filter stages or direct interface with transmission lines, provided thermal limits (1.02 W max at T_A < 25°C) are observed per the THS4281D dissipation ratings.

How does the THS4281D perform in harmonic distortion-critical applications like ADC driving?

The THS4281D achieves –92 dBc second-harmonic distortion at 100 kHz and G = +2 with 2-V_PP output into 1 kΩ, and –67 dBc at 1 MHz - values explicitly measured and published in the THS4281D datasheet Section 6.6. This performance preserves ENOB in 16-bit ADCs such as the ADS8320, especially when paired with proper layout (e.g., 0.1 µF decoupling on V_S+/V_S−) and gain-setting resistors matched to <0.1% tolerance.

THS4281D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm 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-SOIC

THS4281D FAQ

1.How can I place an order for THS4281D through Aetrix?

Please submit a Request for Quotation (RFQ) for THS4281D 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 THS4281D reliable?

The price and inventory of THS4281D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4281D is usually 5 days.

3.What payment methods are accepted for THS4281D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4281D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for THS4281D?

THS4281D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your THS4281D 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 THS4281D?

For technical support, including THS4281D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4281D requirements.

6.How does Aetrix verify that THS4281D is sourced from the original manufacturer or authorized distributors?

All THS4281D 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 THS4281D meets industry standards.

7.What is the process for return or replacement of THS4281D?

All THS4281D units undergo pre-shipment inspection (PSI). If there is an issue with THS4281D, 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 THS4281D part is unused and in its original packaging.

Return procedure for THS4281D:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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