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Texas Instruments THS4131IDG4
- Part No.:
- THS4131IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4131IDG4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,872
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Product details
Overview
THS4131IDG4 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, –102 dBc THD at 250 kHz (±15 V supply), and 1.25 nV/√Hz input voltage noise, enabling high-fidelity differential ADC driving in medical ultrasound and test equipment.
For engineers reviewing the THS4131IDG4 datasheet, THS4131IDG4 pinout, THS4131IDG4 application, or THS4131IDG4 equivalent, this page provides verified package mapping (VSSOP-8), confirmed pin functions (including VOCM, VIN±, VOUT±), thermal performance data (RθJA = 147.3°C/W), and two validated alternative parts with documented functional and application differences.
Technical Context
The THS4131IDG4 implements a true fully differential signal path from input to output using TI's high-voltage complementary bipolar process, supporting dual supplies up to ±15 V or single supply from 5 V to 30 V. Its architecture enables 95 dB common-mode rejection at 800 kHz and eliminates even-order harmonics through inherent symmetry.
No power-down pin is present-unlike the THS4130 variant-making it a fixed-operation amplifier with 15 mA quiescent current (±5 V) and no active shutdown control logic. The VOCM pin directly sets output common-mode voltage, allowing precise DC level shifting for ADC interface alignment without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V supply - enables wideband signal chains up to ~100 MHz usable baseband with margin |
| Slew rate | 51 V/µs - supports fast transient response for 2 VPP signals beyond 8 MHz without slew limiting |
| Total harmonic distortion | –102 dBc at 250 kHz, 2 VPP, ±15 V - ensures minimal spectral contamination in ultrasound receive paths |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - critical for preserving SNR in low-level sensor signal amplification |
| Common-mode rejection | 95 dB at 800 kHz - rejects board-level switching noise and EMI coupling into differential outputs |
| Supply range | ±2.5 V to ±15 V dual or 5 V to 30 V single - accommodates both low-power portable and high-dynamic-range industrial systems |
| Operating temperature | –40°C to +85°C - qualified for industrial and medical environments requiring extended thermal stability |
Pinout & Package
VSSOP-8 (DGK) package: 8-pin, 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed thermal pad (electrically isolated, recommended to connect to ground plane for thermal management).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Differential input (+) | High-impedance, matched input node; requires symmetrical layout and 1% resistor matching for optimal balance |
| VIN− | Differential input (−) | Complementary input node; forms true differential pair with VIN+; mismatch degrades CMRR and HD2 |
| VOCM | Output common-mode control | DC voltage reference input that sets midpoint of VOUT+ and VOUT−; bypass with 0.1 µF to suppress noise |
| VOUT+ | Differential output (+) | Active output stage capable of ±11.5 V swing (±15 V supply); drives ADC inputs or transmission lines |
| VOUT− | Differential output (−) | Complementary output; phase-inverted relative to VOUT+; together defines differential signal amplitude |
| VCC+ | Positive supply rail | Accepts up to +15 V; powers internal bias and output stages; requires local 0.1 µF + 10 µF decoupling |
| VCC− | Negative supply rail | Accepts down to –15 V; referenced for PD threshold in THS4130 (not used in THS4131IDG4) |
| NC | No-connect | Pin 7 is unconnected internally; must be left floating or tied to ground per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Eliminates need for external baluns or transformer-based single-ended-to-differential conversion |
| 1.25 nV/√Hz input voltage noise | Preserves signal integrity in low-amplitude applications like ultrasound echo amplification |
| 95 dB CMRR at 800 kHz | Rejects switching regulator noise and digital crosstalk in mixed-signal PCB layouts |
| 170 MHz bandwidth with ±15 V supply | Supports >100 MSPS ADC sampling with adequate closed-loop gain margin |
| VOCM-controlled output level shift | Aligns differential output DC offset precisely to ADC input common-mode requirements |
Applications
| Ultrasound Signal Conditioning | Differential ADC Driver |
|---|---|
Use Scenario: Amplifying weak RF echoes from piezoelectric transducers in portable and cart-based ultrasound systems. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, noise-limited signal conditioning, and precise VOCM-aligned output for 12–16-bit ADCs. Use Value: 1.25 nV/√Hz noise floor and –102 dBc THD preserve dynamic range and contrast resolution in B-mode imaging. |
Use Scenario: Driving high-resolution differential-input SAR or pipeline ADCs in automated test equipment and data acquisition systems. IC Role / Device Role / Timing Role: Interface amplifier converting single-ended sensor outputs or generating balanced differential inputs for ADCs. Use Value: 170 MHz bandwidth and 51 V/µs slew rate ensure accurate settling within 61 ns (0.01%) for 16-bit conversion accuracy. |
| Antialiasing Filter Buffer | Industrial Sensor Signal Chain |
Use Scenario: Buffering and level-shifting the output of passive antialiasing filters before differential ADC sampling. IC Role / Device Role / Timing Role: High-impedance input buffer with VOCM-adjustable common-mode output to match ADC reference levels. Use Value: 95 dB CMRR prevents filter capacitor imbalance or PCB trace asymmetry from injecting common-mode error into ADC inputs. |
Use Scenario: Conditioning low-level bridge sensor outputs (e.g., strain gauges, pressure sensors) in harsh industrial environments. IC Role / Device Role / Timing Role: Low-drift, low-noise FDA rejecting EMI and providing rail-to-rail compatible differential drive. Use Value: –40°C to +85°C operation and 2 µV/°C input offset drift ensure stable calibration over temperature in factory automation systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131IDGN | HVSSOP-8 package with exposed thermal pad; RθJA = 57.6°C/W vs 147.3°C/W for DGK | Better thermal performance for continuous high-output-current operation (>50 mA avg) | Select IDGN for high-power-density designs requiring lower junction temperature rise |
| THS4561IRGET | Lower noise (0.85 nV/√Hz), higher BW (320 MHz), but only ±5 V max supply; no VOCM pin | Requires external level-shifting for ADC common-mode alignment; limited to low-voltage systems | Select THS4561 for battery-powered, high-BW applications where ±15 V operation is unnecessary |
Compared with THS4131IDG4, THS4131IDGN offers superior thermal dissipation in space-constrained layouts, while THS4561IRGET trades supply voltage headroom for higher speed and lower noise-making each suitable for distinct system-level trade-offs in power, bandwidth, and interface compatibility.
Availability
THS4131IDG4 is available at Aetrix Electronics and suitable for medical ultrasound systems, high-speed data acquisition, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS4131IDG4 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 amplifiers and precision signal chain solutions.
The THS413x product line was designed specifically for demanding fully differential signal paths in medical imaging, test instrumentation, and communications infrastructure-emphasizing low distortion, wide bandwidth, and robust common-mode rejection.
FAQ
What is the function of the VOCM pin on the THS4131IDG4?
The VOCM pin on the THS4131IDG4 sets the output common-mode voltage-the DC midpoint between VOUT+ and VOUT−. Applying a stable voltage (e.g., from a precision reference or resistor divider) to VOCM aligns the differential output to match the required input common-mode range of downstream components such as ADCs. Leaving VOCM floating defaults it to mid-rail (VCC+ + VCC−)/2, but a 0.1-µF bypass capacitor is recommended to suppress noise coupling. This functionality is integral to the THS4131IDG4's role in precision analog interfaces.
Does the THS4131IDG4 have a power-down feature?
No, the THS4131IDG4 does not include a power-down pin. Unlike the THS4130 variant-which features an active-low PD pin-the THS4131IDG4 operates continuously when powered. Its quiescent current is 15 mA at ±5 V and remains constant across temperature (–40°C to +85°C). This fixed-operation design simplifies biasing and eliminates timing concerns related to wake-up latency, making the THS4131IDG4 ideal for always-on signal chains in medical and industrial systems.
What is the maximum supply voltage for the THS4131IDG4?
The THS4131IDG4 supports a maximum total supply voltage of 33 V, with absolute maximum ratings specifying VCC+ to VCC− ≤ 33 V. In dual-supply configurations, it operates up to ±15 V (30 V total); in single-supply mode, it accepts 5 V to 30 V. Operation at ±15 V enables the full 170 MHz bandwidth and ±11.5 V output swing, while maintaining –102 dBc THD at 250 kHz-key specifications confirmed in the official TI datasheet for THS4131IDG4.
Which package type does THS4131IDG4 use, and what are its thermal characteristics?
The THS4131IDG4 uses the VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, with no exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 147.3°C/W, significantly higher than the HVSSOP-8 (DGN) variant's 57.6°C/W. This means the THS4131IDG4 requires careful attention to PCB copper area and airflow in high-power applications. Thermal derating must be applied above 85°C ambient, and the device's maximum junction temperature is 125°C for continuous reliability-verified parameters for THS4131IDG4 in TI's SLOS318L datasheet.
How does the THS4131IDG4 differ from the THS4130IDG4?
The THS4131IDG4 omits the power-down (PD) pin present in the THS4130IDG4, resulting in a simpler 8-pin configuration with Pin 7 designated NC (no connect). Electrically, both share identical AC performance (170 MHz BW, –102 dBc THD), but the THS4131IDG4 has no shutdown capability and draws constant quiescent current. This makes THS4131IDG4 preferable for always-on, low-latency applications, while THS4130IDG4 suits power-gated systems. The "1" vs "0" suffix in THS4131IDG4 explicitly denotes this functional distinction.
THS4131IDG4 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
THS4131IDG4 FAQ
1.How can I place an order for THS4131IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131IDG4 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 THS4131IDG4 reliable?
The price and inventory of THS4131IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131IDG4 is usually 5 days.
3.What payment methods are accepted for THS4131IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131IDG4?
THS4131IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131IDG4 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 THS4131IDG4?
For technical support, including THS4131IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131IDG4 requirements.
6.How does Aetrix verify that THS4131IDG4 is sourced from the original manufacturer or authorized distributors?
All THS4131IDG4 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 THS4131IDG4 meets industry standards.
7.What is the process for return or replacement of THS4131IDG4?
All THS4131IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4131IDG4, 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 THS4131IDG4 part is unused and in its original packaging.
Return procedure for THS4131IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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