THS4031 - 100MHz 1.6nV Low-Noise Op Amp | Texas Instruments
MPN: THS4031 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.45 | $245.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for THS4031 — 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:
THS4031IDGNR
✅ Drop-In📋 Reference alternative (not in catalog)
THS4031CDGNR
✅ Drop-In📋 Reference alternative (not in catalog)
THS4032IDGNR
⚡ Same Package📋 Reference alternative (not in catalog)
THS4031 Maximum Ratings & Electrical Characteristics
| Amplifier Type | Voltage Feedback |
| Channels | 1 |
| Bandwidth (-3 dB, G=2) | 100 MHz |
| Unity Gain Bandwidth | 275 MHz |
| Slew Rate | 100 V/us |
| Settling Time (0.1%) | 60 ns |
| Input Voltage Noise | 1.6 nV/Hz (sqrt Hz) |
| THD (1 MHz, RL=100 ohm) | -72 dBc |
| THD (1 MHz, RL=1k ohm) | -90 dBc |
| Input Offset Voltage | 0.5 mV (typ) |
| Output Current | 90 mA |
| Supply Current | 8.5 mA per channel |
| Supply Voltage Range | ±5 V to ±15 V |
| Stability | Stable in gains of -1 or greater |
| Operating Temperature | -40C to +85C |
| Package | 8-HVSSOP (DGK) with PowerPAD |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
THS4031 Pin Configuration
| Pin 1 | OUT — Amplifier output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connection |
| Pin 6 | NC — No connection |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connection |
| Pin PAD | PowerPAD — Thermal pad, solder to ground plane |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
THS4031 is suitable for 6 applications: Communication Receiver IF/RF Gain Stage, Imaging Signal Chain, ADC Driver, Active Filter Design, Test and Measurement Instrumentation, Industrial Analog Signal Conditioning.
Communication Receiver IF/RF Gain Stage
The THS4031 fits communications receivers where the 1.6 nV/√Hz input noise directly sets the receiver noise floor and dynamic range. Operating from ±5V to ±15V rails with 100-MHz bandwidth and 100-V/µs slew rate, it handles wideband IF gain and buffer stages without compromising linearity: THD stays at -72 dBc at 1 MHz into 100 ohms. Placed as a gain-of-2 stage between a mixer output and a filter or ADC, the 8.5-mA quiescent current keeps power budgets manageable while the 275-MHz gain-bandwidth product preserves flatness across the passband.
Recommended
Imaging Signal Chain
In imaging systems such as ultrasound and CCD/CMOS sensor front ends, the THS4031's 60-ns settling time to 0.1% ensures accurate sample acquisition per pixel or channel. The 1.6 nV/√Hz noise preserves low-level sensor signals, and the 90-mA output drive charges ADC input and cable capacitance quickly. Used as a per-channel gain or buffer stage from ±5V to ±15V supplies, it maintains low offset (0.5 mV typ) so that DC-coupled imaging paths require minimal calibration. The compact 8-HVSSOP package supports dense multichannel boards common in imaging arrays.
Recommended
ADC Driver
The THS4031 is an effective high-speed ADC driver because its 60-ns settling time and 90-mA output current quickly charge ADC sample capacitors, while 1.6 nV/√Hz noise keeps the amplifier from dominating system SNR. Configured in gain of 2 or greater (stable per datasheet), it sits between a signal source and converters such as the ADS7960 or ADS1258. Use a small series isolation resistor at the output to handle capacitive loads, and keep the feedback resistor values moderate (a few hundred ohms to 1k) to limit noise contribution and preserve the 100-MHz bandwidth advantage.
Recommended
Active Filter Design
With a 275-MHz gain-bandwidth product and low 0.5-mV offset, the THS4031 supports high-frequency active filters (Sallen-Key, multiple-feedback) in the tens of MHz where ordinary op amps lose accuracy. The low voltage noise of 1.6 nV/√Hz minimizes filter-added noise, important in test and communication equipment. Operating from ±15V supplies, it provides wide output swing for large-signal filter nodes, and the -90 dBc THD at 1 MHz into 1k ohm keeps harmonic distortion of the filtered signal low. PowerPAD heat spreading allows continuous operation at moderate loads without derating surprises.
Recommended
Test and Measurement Instrumentation
Oscilloscope front ends, signal generators, and data acquisition instruments benefit from the THS4031's combination of 100-MHz bandwidth, low noise, and fast settling. The 90-mA output drives 50-ohm systems and coaxial cables directly, and distortion of -90 dBc at 1 MHz (1k load) preserves measurement fidelity. Wide ±5V to ±15V supply operation accommodates legacy instrument rails, simplifying upgrades of existing designs. Its industrial -40°C to +85°C temperature range and active lifecycle status support long-term instrument platforms where component continuity matters.
Recommended
Industrial Analog Signal Conditioning
In industrial automation, the THS4031 conditions high-speed sensor signals with low noise and wide bandwidth, for example amplifying photodiode or encoder outputs before digitization. The -40°C to +85°C industrial temperature range and RoHS compliance suit factory environments. Running from ±15V industrial rails, the 0.5-mV typical offset minimizes DC errors in transducer interfaces, while the 100-V/µs slew rate handles fast edges without slew-induced distortion. Decouple with 0.1-µF ceramics and solder the PowerPAD to the ground plane to manage heat in sealed enclosures with limited airflow.
Recommended
Recommended Products Summary
Engineering reference data for THS4031 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | THS4031IDGNR | THS4031CDGNR | THS4032IDGNR | THS3091D |
|---|---|---|---|---|---|
| Package | 8-HVSSOP (DGK) | 8-HVSSOP (DGK) - same | 8-HVSSOP (DGK) - same | 8-HVSSOP (DGK) - same (dual) | SOIC-8 (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 1 | 1 | 1 | 2 | 1 |
| Bandwidth | 100 MHz (G=2) | 100 MHz (G=2) | 100 MHz (G=2) | 100 MHz (G=2) | [DATA_NEEDED] |
| Input Voltage Noise | 1.6 nV/Hz (sqrt) | 1.6 nV/Hz (sqrt) | 1.6 nV/Hz (sqrt) | 1.6 nV/Hz (sqrt) | [DATA_NEEDED] |
| Slew Rate | 100 V/us | 100 V/us | 100 V/us | 100 V/us | [DATA_NEEDED] |
| Output Current | 90 mA | 90 mA | 90 mA | 90 mA | [DATA_NEEDED] |
| Temperature Grade | -40C to +85C (I grade) | -40C to +85C | 0C to +70C | -40C to +85C | [DATA_NEEDED] |
Key Differentiators
- Ultra-low 1.6 nV/√Hz voltage noise (vs THS3091D)
- Dual-channel footprint upgrade path (vs THS4032IDGNR)
- Wide ±15V supply operation (vs THS3091D)
Design Notes
Solder the HVSSOP PowerPAD to a contiguous copper ground plane under the IC. The PowerPAD is the primary thermal path; without it, junction temperature rises significantly at 8.5 mA supply current plus load current. Per the TI THS403x datasheet layout section, use a thermal-via array under the pad.
Place 0.1-µF ceramic decoupling capacitors within a few millimeters of the V+ (pin 7) and V- (pin 4) pins, plus a 2.2-µF to 10-µF bulk capacitor per rail. With a 100-MHz signal path, high-frequency supply impedance directly affects distortion and stability.
Keep the inverting node compact and use feedback resistors of a few hundred ohms to 1k. Excessive feedback resistance adds Johnson noise above the 1.6 nV/√Hz amplifier noise and parasitic capacitance at the summing node can erode phase margin. Add a small series output resistor (10-33 ohm) when driving coax or capacitive loads.
Compliance Information
RoHS compliance stated in internal database description. AEC-Q100 not indicated for standard THS4031; verify on TI product page per ordering part number.
