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Texas Instruments THS4131IDR
- Part No.:
- THS4131IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4131IDR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,210
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Product details
Overview
THS4131IDR 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 THS4131IDR datasheet, THS4131IDR pinout, THS4131IDR application, or THS4131IDR equivalent, this page provides verified electrical specifications, SOIC-8 package details, VOCM-controlled common-mode output configuration, and validated alternatives for differential signal chain design.
Technical Context
The THS4131IDR implements a true fully differential architecture 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.
No power-down pin is present (unlike THS4130), eliminating control logic overhead but requiring continuous biasing. Input stage features 215 MΩ common-mode resistance and 10 kΩ differential resistance, while output stage delivers ±11.5 V swing into 1 kΩ at ±15 V supplies with 41 Ω open-loop output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V supply - enables baseband signal amplification up to UHF frequencies without gain peaking. |
| Slew rate | 51 V/µs - supports clean 2 VPP output transitions at ≥250 kHz without slewing distortion. |
| Total harmonic distortion | –102 dBc at 250 kHz, 2 VPP - ensures minimal even-order harmonics in ADC driver applications. |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - preserves SNR in low-amplitude sensor signal chains. |
| 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. |
| Quiescent current | 13 mA at ±15 V - balances speed and power in always-on differential signal paths. |
Pinout & Package
THS4131IDR is packaged in an 8-pin SOIC (D package) with standard JEDEC outline, 1.27 mm pitch, and exposed thermal pad not present (HVSSOP variant DGN includes thermal pad; SOIC does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Positive differential input | Accepts in-phase component of fully differential or single-ended input signals; referenced to VOCM for common-mode setting. |
| VIN− | Negative differential input | Accepts out-of-phase component; combined with VIN+ defines differential input voltage across 10 kΩ internal resistance. |
| VOCM | Output common-mode control | DC voltage applied here directly sets average of VOUT+ and VOUT−; floating defaults to (VCC+ + VCC−)/2. |
| VOUT+ | Positive differential output | Delivers amplified in-phase output; requires matched feedback network (e.g., 390 Ω) for gain = 1 V/V configuration. |
| VOUT− | Negative differential output | Delivers inverted output; symmetry with VOUT+ enables rejection of even-order distortion and common-mode noise. |
| VCC+ | Positive supply rail | Supports up to +15 V; powers internal bias circuitry and output stage; decoupling capacitor required near pin. |
| VCC− | Negative supply rail | Supports down to –15 V; establishes reference for VOCM and input common-mode range (–4 V to +4.5 V). |
| NC | No connect | Pin 7 is unconnected die bond pad; must remain floating-no routing or grounding permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Eliminates need for external baluns or transformer coupling while maintaining >95 dB CMRR up to 800 kHz. |
| VOCM-controlled output common-mode | Enables direct interface to ADC reference pins or level-shifting without resistor dividers or op-amp buffers. |
| High supply voltage capability | ±15 V operation provides >22 VPP differential output swing-critical for driving 16-bit+ SAR and sigma-delta ADCs. |
| Low 1/f noise corner | 350 Hz corner frequency ensures stable DC-coupled performance in ultrasound beamforming and TGC circuits. |
| Matched internal input resistance | 10 kΩ differential and 215 MΩ common-mode input resistance minimize gain error and CMRR degradation from external mismatch. |
Applications
| Medical Ultrasound Beamforming | Differential ADC Driver |
|---|---|
|
Use Scenario: Amplifying time-gain-controlled (TGC) analog signals from phased-array transducers prior to digitization. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shift, and antialiasing filtering interface to AFE58JD18 or similar ultrasound ADCs. Use Value: –102 dBc THD at 250 kHz preserves harmonic content for tissue characterization; 170 MHz bandwidth supports >10 MHz center-frequency transducers. |
Use Scenario: Driving high-resolution differential-input ADCs such as ADS8900 or AD7626 in data acquisition systems. IC Role / Device Role / Timing Role: Signal conditioner converting single-ended sensor outputs to balanced differential signals with precise VOCM alignment to ADC reference. Use Value: 95 dB CMRR rejects ground-bounce noise on shared PCB return paths; 1.25 nV/√Hz noise floor maintains ENOB >16 bits at 100 kSPS. |
| Single-Ended to Differential Conversion | Differential Antialiasing Filter Interface |
|
Use Scenario: Converting legacy single-ended instrumentation outputs (e.g., DAC8802) into differential format for noise-immune transmission. IC Role / Device Role / Timing Role: Gain-stage FDA configured with single-ended input and VOCM set to mid-rail, producing symmetrical ±VOUT outputs. Use Value: No external phase-inversion circuitry needed; 51 V/µs slew rate handles fast DAC settling edges without distortion. |
Use Scenario: Integrating with passive RC antialiasing filters before high-speed ADC inputs in spectrum analyzers or oscilloscope front-ends. IC Role / Device Role / Timing Role: Low-output-impedance buffer isolating filter capacitance from ADC input, preserving filter Q and cutoff accuracy. Use Value: 41 Ω open-loop output impedance minimizes interaction with 1–10 pF filter capacitors; 170 MHz bandwidth avoids filter-induced roll-off. |
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 (3.0 × 3.0 mm), higher thermal resistance (RθJA = 147.3°C/W vs 126.3°C/W), same electrical specs. | Better suited for space-constrained PCBs where SOIC footprint is prohibitive; requires tighter layout for thermal management. | Select THS4131IDGK when board area is constrained and thermal vias under exposed pad are feasible. |
| THS4561IRGET | Lower noise (0.85 nV/√Hz), wider bandwidth (320 MHz), but lower output swing (±2.2 V at ±5 V) and no ±15 V support. | Optimized for low-voltage, high-bandwidth applications like communications IF stages-not suitable for ±15 V ultrasound or industrial DAQ. | Choose THS4561IRGET only for 3.3 V/5 V systems requiring sub-1 nV/√Hz noise and >300 MHz bandwidth. |
Compared with THS4131IDR, THS4131IDGK offers identical performance in a smaller package at higher thermal cost, while THS4561IRGET trades supply flexibility and output drive for ultra-low noise and higher bandwidth in low-voltage domains.
Availability
THS4131IDR is available at Aetrix Electronics and suitable for medical imaging equipment, precision data acquisition systems, and industrial test instrumentation requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for THS4131IDR 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 engineered specifically for demanding differential signal chain applications-including ultrasound, high-resolution ADC interfacing, and RF/IF conditioning-where low distortion, wide bandwidth, and precise common-mode control are critical.
FAQ
What is the function of the VOCM pin on the THS4131IDR?
The VOCM pin on the THS4131IDR directly sets the common-mode voltage of the differential outputs (VOUT+ and VOUT−). Applying a stable DC voltage-such as an ADC reference or mid-rail divider-to VOCM forces the average of VOUT+ and VOUT− to match that voltage. When left floating, VOCM defaults to (VCC+ + VCC−)/2. This eliminates external level-shifting circuitry and ensures optimal ADC interface alignment in the THS4131IDR signal path.
Does the THS4131IDR have a power-down feature?
No, the THS4131IDR does not include a power-down pin. Unlike the THS4130IDR, which uses an active-low PD pin, the THS4131IDR is designed for continuous operation with no shutdown capability. Its quiescent current remains fixed at 13 mA under ±15 V conditions. If power gating is required, external supply switching or series FETs must be implemented-THS4131IDR itself has no internal power-down mode.
What package type is used for the THS4131IDR part number?
The THS4131IDR uses the SOIC-8 (D) package: 8-pin small-outline integrated circuit with 1.27 mm lead pitch, JEDEC MS-012AC outline, and no exposed thermal pad. This differs from the THS4131IDGN (HVSSOP-8 with thermal pad) and THS4131IDGK (VSSOP-8). The "R" suffix denotes tape-and-reel packaging; the "I" suffix indicates –40°C to +85°C operating temperature range.
Can the THS4131IDR drive heavy capacitive loads directly?
The THS4131IDR is not optimized for direct capacitive load driving above 10 pF due to potential phase-margin loss and ringing. For loads exceeding 10 pF-including ADC input capacitance or long PCB traces-a 20 Ω series resistor must be placed at each output (VOUT+ and VOUT−) per TI's recommended layout. This isolation maintains stability while preserving bandwidth; omitting these resistors risks oscillation in the THS4131IDR output stage.
How does the THS4131IDR differ from the THS4130IDR in practical design?
The THS4131IDR omits the power-down (PD) pin present on the THS4130IDR, simplifying biasing but removing standby current control. Electrically, both share identical bandwidth (170 MHz), noise (1.25 nV/√Hz), and distortion (–102 dBc) specs. However, THS4131IDR's NC pin (Pin 7) must remain unconnected, whereas THS4130IDR uses that pin for PD activation-making them non-interchangeable without schematic and layout revision in the THS4131IDR design.
THS4131IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
THS4131IDR FAQ
1.How can I place an order for THS4131IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131IDR 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 THS4131IDR reliable?
The price and inventory of THS4131IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131IDR is usually 5 days.
3.What payment methods are accepted for THS4131IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131IDR?
THS4131IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131IDR 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 THS4131IDR?
For technical support, including THS4131IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131IDR requirements.
6.How does Aetrix verify that THS4131IDR is sourced from the original manufacturer or authorized distributors?
All THS4131IDR 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 THS4131IDR meets industry standards.
7.What is the process for return or replacement of THS4131IDR?
All THS4131IDR units undergo pre-shipment inspection (PSI). If there is an issue with THS4131IDR, 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 THS4131IDR part is unused and in its original packaging.
Return procedure for THS4131IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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