THS4271D - 400MHz High-Speed Amplifier | Texas Instruments
MPN: THS4271D ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.7912 | $6.79 |
| 10 | $4.1565 | $41.57 |
| 100 | $4.1565 | $415.65 |
| 500 | $4.1565 | $2,078.25 |
| 1,000 | $4.1565 | $4,156.50 |
THS4271D Overview
A voltage-feedback operational amplifier is an analog amplifier whose feedback network sets the closed-loop gain while preserving stability at unity gain. The THS4271 belongs to the broader hierarchy of operational amplifiers, analog signal-chain ICs, and semiconductors. Its defining combination is low noise, high slew rate, broad bandwidth, low distortion, and unity-gain stability. These properties allow it to amplify small signals without the timing or stability limitations associated with decompensated amplifiers.
The 400 MHz gain-bandwidth product supports high closed-loop bandwidth, while the 1000 V/us slew rate allows large-amplitude signals to transition quickly and reduces distortion. Low voltage noise is valuable when the amplifier follows a sensing or conversion stage. Unity-gain stability simplifies implementation because the device can be configured as a buffer without adding compensation capacitors. The available 8-SOIC package supports conventional surface-mount assembly and is specified for operation from 5 V to 10 V total supply voltage.
The THS4271D is particularly appropriate for high-linearity ADC preamplifiers, where bandwidth, noise, and settling behavior directly affect conversion accuracy. It can also buffer high-speed DAC outputs, receive small signals in wireless communications equipment, and implement differential-to-single-ended signal conversion. In instrumentation, the combination of low noise and low distortion supports precision analog front ends where signal fidelity is more important than cost or power consumption.
Designers should preserve the high-speed signal path with short traces, a solid ground plane, and carefully placed bypass capacitors. Input and feedback components should be physically small to minimize parasitic capacitance and instability risk. Because a 400 MHz amplifier can amplify high-frequency noise and respond to layout discontinuities, controlled impedance, grounding, and decoupling are essential.
This page combines manufacturer specifications, verified distributor availability, packaging information, and practical replacement guidance. It also distinguishes the THS4271 from the closely related THS4275, which adds a power-down function, helping engineers select the correct amplifier without relying only on a generic distributor description.
Drop-in alternatives for THS4271D — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
THS4271DR
✅ Drop-In📋 Reference alternative (not in catalog)
THS4275D
✅ Drop-In📋 Reference alternative (not in catalog)
THS4275DR
✅ Drop-In📋 Reference alternative (not in catalog)
THS4211D
✅ Drop-In✓ In Stock
$7.4237 / Unit
View Datasheet →OPA656U
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
THS4271D Maximum Ratings & Electrical Characteristics
| Amplifier Type | Voltage-feedback operational amplifier |
| Number of Circuits | 1 circuit |
| Gain-Bandwidth Product | 400 MHz |
| Slew Rate | 1000 V/us |
| Unity-Gain Stable | Yes |
| Total Supply Voltage Range | 5 V to 10 V |
| Maximum Total Supply Voltage | +/-7.5 V |
| Minimum Total Supply Voltage | +/-2.5 V |
| Package | 8-SOIC (0.154 inch, 3.90 mm width) |
| Mounting Type | Surface mount |
| Supplier Inventory | 10,176 pieces |
| Supplier Unit Price | $6.7912 per unit |
THS4271D Pin Configuration
| Pin 1 | NC — Not connected |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply connection |
| Pin 5 | NC — Not connected |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply connection |
| Pin 8 | NC — Not connected |
Typical Applications
THS4271D is suitable for 6 applications: High-Linearity ADC Preamplifier, Wireless Communication Receiver, High-Speed DAC Output Buffer, Differential-to-Single-Ended Conversion, Precision Instrumentation Front End, High-Speed Data Acquisition.
High-Linearity ADC Preamplifier
The THS4271D fits high-linearity ADC preamplification because its 400 MHz gain-bandwidth product and 1000 V/us slew rate support wide-band signal conditioning without requiring a decompensated amplifier. According to the Texas Instruments manufacturer datasheet, low noise and low distortion are central advantages of the device. Place it ahead of a high-speed ADC and select the closed-loop gain so that bandwidth and settling meet the converter's acquisition requirements. Keep the feedback network and input routing short because parasitic capacitance can disturb the stability of a 400 MHz amplifier.
Recommended
Wireless Communication Receiver
The THS4271D is suitable for wireless communication receiver signal chains because its 400 MHz gain-bandwidth product, 1000 V/us slew rate, and low-noise operation can preserve small-signal information across a broad frequency range. According to the Texas Instruments manufacturer datasheet, wireless communication receivers are an explicit application. The amplifier can provide gain or buffering ahead of mixer, filter, or converter stages, provided the closed-loop response and output loading are verified. Controlled-impedance routing and solid ground return paths are especially important at this bandwidth.
Recommended
High-Speed DAC Output Buffer
The THS4271D can buffer the output of a high-speed DAC because its 400 MHz gain-bandwidth product and 1000 V/us slew rate support fast signal transitions with low distortion. According to the Texas Instruments manufacturer datasheet, DAC output buffering is a listed application, while unity-gain stability simplifies voltage-follower implementation. Use short output traces and verify capacitive loading because amplifier stability and settling can change with the DAC, cable, or termination connected to the output. Local decoupling remains necessary for clean dynamic performance.
Recommended
Differential-to-Single-Ended Conversion
The THS4271D is appropriate for differential-to-single-ended conversion because its wide bandwidth and high slew rate maintain signal fidelity while it drives a single-ended downstream stage. According to the Texas Instruments manufacturer datasheet, differential-to-single-ended conversion is an explicit use case, and the device's unity-gain stability supports practical resistor-feedback implementation. Component matching in the differential network directly influences rejection accuracy, while short routing and an uninterrupted ground plane reduce conversion-node noise. The chosen feedback values should also be checked against the exact pin configuration.
Recommended
Precision Instrumentation Front End
The THS4271D can serve in precision instrumentation when signal fidelity, bandwidth, and low distortion matter more than minimum power. According to the Texas Instruments manufacturer datasheet, the amplifier combines low noise, wide bandwidth, and low distortion in a unity-gain-stable device. Its 400 MHz bandwidth allows fast sensor or measurement signals to be amplified without compensation, while 1000 V/us slew rate preserves large-signal fidelity. Designers should still account for sensor noise, resistor tolerance, input capacitance, and the exact common-mode range before committing the device to a precision measurement chain.
Recommended
High-Speed Data Acquisition
The THS4271D supports high-speed data-acquisition front ends by combining 400 MHz gain-bandwidth product with low-noise, low-distortion operation. According to the Texas Instruments manufacturer datasheet, the amplifier can be used for high-linearity ADC preamplification and other broadband analog stages. A practical implementation should include input attenuation or gain appropriate to the ADC range, close-tolerance feedback components, and short traces between the amplifier and converter. The 1000 V/us slew rate helps preserve timing fidelity, but overall acquisition bandwidth remains limited by the ADC and source impedance.
Recommended
Recommended Products Summary
Engineering reference data for THS4271D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | THS4271DR | THS4275D | THS4275DR | THS4211D | OPA656U |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | SOIC-8 - same package class |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Type | Voltage-feedback operational amplifier | Voltage-feedback operational amplifier | Voltage-feedback operational amplifier with power-down | Voltage-feedback operational amplifier with power-down | High-speed voltage-feedback operational amplifier | High-speed voltage-feedback operational amplifier |
Key Differentiators
- Unity-gain-stable high-speed operation (vs THS4211D)
- Core performance without shutdown control (vs THS4275D)
- Identical device in reeled order format (vs THS4271DR)
Design Notes
Route the feedback loop before placing external gain components. The THS4271D's 400 MHz gain-bandwidth product makes parasitic inductance and capacitance significant, so the feedback resistor and compensation capacitor should connect directly to the output and input pins. Keep input and output traces short, avoid stubs, maintain a continuous ground plane, and use controlled impedance when the signal path is treated as a transmission line.
Place the supply bypass capacitor immediately beside the THS4271D power pins and connect it to the ground plane with the shortest practical return path. The permitted total supply range is 5 V to 10 V, so do not infer that either rail can independently exceed the stated total limit. Decoupling requirements should follow the manufacturer datasheet's recommended network because the 1000 V/us slew rate can produce fast current edges at the device.
Do not assume that unity-gain stability permits arbitrary capacitive loading. The amplifier's output current, input common-mode range, output swing, and stability must be checked against the DAC, ADC, cable, and termination connected to it. According to the Texas Instruments manufacturer datasheet, the THS4271 is designed to avoid decompensated-amplifier stability concerns, but real PCB parasitics and load capacitance can still alter frequency response.
Check gain, phase margin, output swing, and settling against the actual source and load rather than using the 400 MHz gain-bandwidth product as a direct closed-loop bandwidth guarantee. Use small, consistent feedback components and observe the datasheet's recommended operating and application circuits. For ADC preamplification, include converter kickback and sampling-capacitor transients in system-level simulation before finalizing the layout.
Compliance Information
The supplied product and distributor snippets do not provide explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statements. The THS4271D is a general-purpose amplifier rather than an automotive-qualified device, but no separate AEC-Q100 qualification claim was provided.
