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Texas Instruments THS4131ID
- Part No.:
- THS4131ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4131ID.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,808
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Product details
Overview
THS4131ID from Texas Instruments is a fully differential input/output amplifier optimized for high-speed, low-noise signal conditioning in precision analog front-ends. It delivers 170 MHz small-signal bandwidth, 51 V/µs slew rate, and –102 dBc THD at 250 kHz with ±15 V supplies, serving as a differential ADC driver or single-ended-to-differential converter in medical ultrasound and data acquisition systems.
For engineers reviewing the THS4131ID datasheet, THS4131ID pinout, THS4131ID application, or THS4131ID equivalent, this page provides verified electrical specifications, thermal performance data for the I-suffix industrial-grade SOIC-8 package, VOCM-controlled output common-mode setting, and validated alternatives for differential signal chain design.
Technical Context
The THS4131ID implements a true fully differential signal path with matched internal gain stages and a dedicated VOCM input that directly sets output common-mode voltage-enabling precise level shifting without external resistive dividers. Its complementary bipolar process supports ±15 V supply operation and achieves 95 dB CMRR at 800 kHz.
Unlike conventional op-amps, it features symmetrical differential inputs and outputs with no power-down pin (distinguishing it from THS4130), and its open-loop gain of 71–78 dB and 1.25 nV/√Hz input voltage noise support high-fidelity signal amplification in wideband applications up to 100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V supply - enables full-power response for signals up to Nyquist frequency of 85 MSPS ADCs |
| Slew rate | 51 V/µs - supports clean reproduction of fast transient signals without slewing-induced distortion |
| Total harmonic distortion | –102 dBc at 250 kHz, 2 VPP output - ensures minimal spectral contamination in sensitive measurement paths |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - preserves SNR in low-amplitude, high-gain stages before ADCs |
| Common-mode rejection ratio | 95 dB at 800 kHz - rejects coupled noise in mixed-signal PCB layouts with shared ground returns |
| Supply voltage range | ±2.5 V to ±15 V (dual) or 5 V to 30 V (single) - accommodates both low-voltage portable and high-dynamic-range industrial rails |
| Operating temperature | –40°C to +85°C - qualified for industrial and medical equipment deployed in uncontrolled environments |
Pinout & Package
THS4131ID is supplied in an 8-pin SOIC (D) package with standard JEDEC MS-012AC footprint and exposed thermal pad not present (HVSSOP-8 variant has thermal pad; SOIC-8 does not). Pin 1 is VIN+, pin 2 is VOCM, pin 3 is VCC+, pin 4 is VOUT+, pin 5 is VOUT–, pin 6 is VCC–, pin 7 is VIN–, and pin 8 is NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Differential input (non-inverting) | Accepts positive half of balanced input signal; requires matched impedance to VIN– for optimal CMRR |
| VOCM | Common-mode output control input | DC voltage applied here sets average of VOUT+ and VOUT–; bypass with 0.1 µF capacitor to suppress noise |
| VCC+ | Positive supply rail | Supports up to +15 V; must be decoupled locally with ≥0.1 µF ceramic capacitor near pin |
| VOUT+ | Positive differential output | Delivers amplified, phase-inverted replica of VIN+ relative to VOUT–; drives ADC AIN+ or transmission line |
| VOUT– | Negative differential output | Delivers amplified, phase-inverted replica of VIN– relative to VOUT+; completes differential pair for noise immunity |
| VCC– | Negative supply rail | Supports down to –15 V; symmetric decoupling required to maintain PSRR >70 dB across frequency |
| VIN– | Differential input (inverting) | Accepts negative half of balanced input; matched layout critical to preserve 95 dB CMRR at 800 kHz |
| NC | No-connect terminal | Internally unconnected; must remain floating-no external connection or pull-up/down allowed |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Eliminates need for external baluns or transformer coupling when interfacing to differential ADCs like AFE58JD18 |
| VOCM-controlled output common-mode | Enables direct matching to ADC reference midpoints (e.g., 2.5 V for 5 V supplies) without resistor networks or op-amp buffers |
| High supply voltage capability (±15 V) | Provides >22 VPP differential swing into 800 Ω load-supports high-resolution digitization of ultrasound echo signals |
| Low 1/f noise corner (350 Hz) | Maintains low-frequency SNR integrity in DC-coupled sensor interfaces such as time-gain-control (TGC) DAC reference paths |
| Industrial temperature grade (–40°C to +85°C) | Validated for continuous operation in medical imaging chassis and factory automation I/O modules without derating |
Applications
| Medical Ultrasound Signal Chain | Differential ADC Driver |
|---|---|
Use Scenario: Amplifying weak, wideband echo return signals from piezoelectric transducers prior to digitization in portable ultrasound systems. IC Role / Device Role / Timing Role: Fully differential amplifier providing single-ended-to-differential conversion, gain, and common-mode level shifting to match ADC input range. Use Value: 170 MHz bandwidth and –102 dBc THD preserve tissue contrast resolution and harmonic imaging fidelity at 5–15 MHz center frequencies. |
Use Scenario: Driving high-speed differential-input ADCs (e.g., THS1206, AFE58JD18) in data acquisition systems requiring >10-bit ENOB at multi-MSPS rates. IC Role / Device Role / Timing Role: Precision differential driver stage ensuring matched amplitude/phase between AIN+ and AIN– inputs to minimize dynamic common-mode error. Use Value: 95 dB CMRR at 800 kHz rejects board-level switching noise, while 1.25 nV/√Hz noise floor maintains >70 dB SNR up to 10 MHz. |
| Single-Ended to Differential Conversion | Differential Antialiasing Filter Interface |
Use Scenario: Converting legacy single-ended sensor outputs (e.g., strain gauge bridges, current sense amps) into balanced differential signals for noise-immune routing across PCBs. IC Role / Device Role / Timing Role: Gain-stage FDA configured with single-ended input and differential output using VOCM to set output common-mode midpoint. Use Value: Eliminates need for discrete transformer or active balun; 51 V/µs slew rate supports step-response fidelity in closed-loop control feedback paths. |
Use Scenario: Interfacing passive or active antialiasing filters (e.g., 2nd-order Butterworth) to differential ADC inputs in spectrum analyzers and communication receivers. IC Role / Device Role / Timing Role: Buffer and level-shift stage isolating filter output impedance from ADC input capacitance while maintaining amplitude balance. Use Value: High input impedance (>215 MΩ common-mode) prevents filter loading; low output impedance (<41 Ω) ensures stable settling into 10 pF ADC input caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131IDGK | VSSOP-8 package with same electrical specs; 147.3°C/W RθJA vs 126.3°C/W for SOIC-8; no thermal pad | Better suited for space-constrained layouts where 3.0 × 3.0 mm footprint is mandatory; slightly higher thermal resistance requires careful power budgeting | Select THS4131IDGK only when board area is constrained and ambient temperature remains <70°C; otherwise prefer SOIC-8 for thermal margin. |
| THS4561IRGET | Lower 1.6 nV/√Hz noise, 1.8 GHz GBW, but only ±5.5 V max supply; no VOCM pin-uses internal reference | Optimized for RF/IF sampling (up to 500 MSPS), not high-voltage ultrasound; lacks user-adjustable common-mode control | Choose THS4561IRGET for communications receivers needing ultra-low noise above 100 MHz; avoid for ±15 V industrial or medical systems requiring VOCM flexibility. |
Compared with THS4131ID, THS4131IDGK offers identical functionality in a smaller package but trades thermal performance for size, while THS4561IRGET targets higher-frequency, lower-supply applications with fixed common-mode architecture-making THS4131ID the sole choice for ±15 V, VOCM-programmable, industrial-grade differential driving.
Availability
THS4131ID is available at Aetrix Electronics and suitable for medical ultrasound systems, industrial data acquisition, test equipment front-ends, and high-precision sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for THS4131ID 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 over 50 years of innovation in high-performance amplifiers and data converters.
The THS413x product line was designed specifically for demanding differential signal chain applications-including medical imaging, instrumentation, and communications-where low distortion, wide bandwidth, and precise common-mode control are essential.
FAQ
What is the function of the VOCM pin on the THS4131ID?
The VOCM pin on the THS4131ID sets the output common-mode voltage-the average DC level of VOUT+ and VOUT–. Applying a stable voltage (e.g., 2.5 V for a 5 V single supply) directly configures the amplifier's output midpoint, enabling seamless interface to differential ADCs without external resistive dividers or op-amp buffers. A 0.1 µF bypass capacitor is required to suppress noise coupling into this sensitive control node.
Does the THS4131ID have a power-down feature?
No, the THS4131ID does not include a power-down pin. This distinguishes it from the THS4130ID, which features an active-low PD pin. The THS4131ID operates continuously when powered; if low-quiescent-current shutdown is required, system-level power sequencing or external enable circuitry must be implemented. Its typical quiescent current is 13 mA at ±15 V.
Which package variants are available for the THS4131ID?
The THS4131ID is orderable in three package types: SOIC-8 (D), VSSOP-8 (DGK), and HVSSOP-8 (DGN). All share identical electrical specifications and –40°C to +85°C temperature rating. The SOIC-8 version used in THS4131ID has no thermal pad, while DGN includes an exposed thermal pad for enhanced heat dissipation in high-power-density designs.
How does resistor matching affect THS4131ID performance?
Resistor matching in the feedback network directly impacts THS4131ID output balance, CMRR, PSRR, and second-harmonic distortion. Mismatch >0.1% degrades common-mode rejection and introduces unwanted even-order harmonics. TI recommends 1% or better tolerance resistors (e.g., 390 Ω for G = 1) and symmetrical PCB layout to preserve the device's specified 95 dB CMRR at 800 kHz.
Can the THS4131ID drive capacitive loads?
Yes, but with caution: the THS4131ID is internally compensated for optimal bandwidth and slew rate, making it sensitive to capacitive loading. For loads >10 pF, a series isolation resistor (≥20 Ω) must be placed at each output (VOUT+ and VOUT–) to maintain stability and prevent high-frequency ringing. This is critical when driving ADC input capacitance or long PCB traces.
THS4131ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 52V/µs
- Gain Bandwidth Product:
- 225 MHz
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 12.3mA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 33 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4131ID FAQ
1.How can I place an order for THS4131ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131ID 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 THS4131ID reliable?
The price and inventory of THS4131ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131ID is usually 5 days.
3.What payment methods are accepted for THS4131ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131ID?
THS4131ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131ID 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 THS4131ID?
For technical support, including THS4131ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131ID requirements.
6.How does Aetrix verify that THS4131ID is sourced from the original manufacturer or authorized distributors?
All THS4131ID 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 THS4131ID meets industry standards.
7.What is the process for return or replacement of THS4131ID?
All THS4131ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4131ID, 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 THS4131ID part is unused and in its original packaging.
Return procedure for THS4131ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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