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Texas Instruments THS4081CD
- Part No.:
- THS4081CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4081CD.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
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Product details
Overview
THS4081CD from Texas Instruments is a single-channel, ultralow-quiescent-current (3.4 mA), high-speed voltage-feedback operational amplifier optimized for video and communication signal conditioning. It delivers 175 MHz bandwidth (−3 dB, G = 1), 230 V/µs slew rate, and 43 ns settling time (0.1%), with 85 mA output drive capability and <0.01% differential gain error-enabling precision analog front-ends in broadcast-grade video systems.
For engineers reviewing the THS4081CD datasheet, THS4081CD pinout, THS4081CD application, or THS4081CD equivalent, key selection considerations include its ±5 V to ±15 V dual-supply operation, SOIC-8 package with PowerPAD-compatible thermal design, low distortion (−64 dBc THD at 1 MHz), and verified performance in 35 MHz 0.1 dB flat bandwidth video paths.
Technical Context
The THS4081CD employs a dielectrically isolated complementary bipolar process enabling GHz fT transistors, supporting voltage-feedback architecture with internally compensated stability optimized for wideband gain configurations (G ≥ 1). Its input stage features matched NPN/PNP pairs for low offset drift (15 µV/°C) and high CMRR (90 dB).
Output stage delivers rail-to-rail swing capability (±13.6 V into 250 Ω at ±15 V supplies) with short-circuit protection and thermal shutdown. The device operates across 0°C to 70°C ambient (C-suffix), with absolute maximum supply of ±16.5 V and junction temperature limit of 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (−3 dB) | 175 MHz at ±15 V, G = 1 - supports full HD baseband video and broadband IF amplification without gain peaking. |
| Slew Rate | 230 V/µs at ±15 V - enables clean reproduction of fast transient signals up to ~35 MHz without slewing distortion. |
| Settling Time (0.1%) | 43 ns at ±15 V, 5-V step - meets timing requirements for high-speed data acquisition and digital video sampling clocks. |
| Total Harmonic Distortion | −64 dBc at 1 MHz, RL = 150 Ω - ensures minimal spectral contamination in composite video and RF IF stages. |
| Differential Gain/Phase | 0.01% / 0.05° at NTSC, ±15 V - satisfies broadcast video fidelity standards (e.g., SMPTE RP-168) for SD/HD component processing. |
| Supply Current | 3.4 mA per channel at ±15 V - enables multi-amplifier video chains with low thermal load and extended system power budget. |
| Input Voltage Noise | 10 nV/√Hz at 10 kHz - preserves SNR in low-level signal amplification (e.g., camera sensor outputs, ADC drivers). |
Pinout & Package
THS4081CD is housed in an 8-pin SOIC (D) package with exposed thermal pad option (PowerPAD™), compatible with standard surface-mount assembly. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused terminal; must remain unconnected or tied to ground only if required by layout EMI mitigation. |
| 2 (IN−) | Inverting input | Differential input node; requires matched trace length and impedance control to minimize common-mode rejection degradation. |
| 3 (IN+) | Noninverting input | High-impedance input (1 MΩ); sensitive to PCB stray capacitance-keep trace short and guard-ring isolated. |
| 4 (VCC−) | Negative supply rail | Connect to stable low-impedance −VCC; decouple with 0.1 µF ceramic + 6.8 µF tantalum within 0.1 inch. |
| 5 (NC) | No internal connection | Unused terminal; electrically isolated-no routing or soldering required. |
| 6 (OUT) | Amplifier output | Capable of driving 150 Ω loads; series 20 Ω resistor recommended for >10 pF capacitive loads to prevent ringing. |
| 7 (VCC+) | Positive supply rail | Connect to stable low-impedance +VCC; same decoupling as VCC−; avoid shared traces with digital supplies. |
| 8 (NC) | No internal connection | Unused terminal; no electrical function-leave floating or ground per board-level ESD strategy. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.4 mA per channel at ±15 V enables thermally constrained video modules and portable instrumentation without forced air cooling. |
| High output drive | 85 mA typical into 20 Ω allows direct driving of 75 Ω coaxial lines and multiple downstream loads without external buffers. |
| Video-optimized AC performance | 35 MHz 0.1 dB flat bandwidth + 0.01%/0.05° differential gain/phase meets NTSC/PAL broadcast linearity specs. |
| Wide supply range | Operates from ±5 V to ±15 V dual supply or 10 V to 30 V single supply-supports legacy industrial and modern low-voltage designs. |
| Thermally enhanced packaging | SOIC-8 with optional PowerPAD™ (DGN) reduces θJA to 58.4°C/W-doubles safe continuous power dissipation vs. standard SOIC. |
Applications
| Professional Video Signal Distribution | Broadcast Camera Signal Conditioning |
|---|---|
Use Scenario: Amplifying and distributing composite or component video signals across studio routers and monitor walls. IC Role / Device Role / Timing Role: High-fidelity buffer and driver maintaining signal integrity over 100 m coaxial runs at 35 MHz bandwidth. Use Value: 0.01% differential gain error prevents hue shifts; 175 MHz bandwidth accommodates future 4K/12G-SDI auxiliary channel expansion. | Use Scenario: Conditioning analog output from CMOS image sensors before digitization in ENG/EFP cameras. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage preceding 12-bit+ ADCs with precise DC-coupled offset control. Use Value: 10 nV/√Hz input noise preserves dynamic range; 43 ns settling time aligns with 100+ MSPS sampling clocks. |
| Medical Ultrasound Beamforming | Test & Measurement Instrumentation |
Use Scenario: Driving transmit/receive switch matrices and analog delay lines in portable ultrasound front-ends. IC Role / Device Role / Timing Role: High-slew-rate driver delivering clean 5–15 MHz burst waveforms with minimal phase distortion. Use Value: 230 V/µs slew rate avoids pulse edge rounding; −64 dBc THD prevents harmonic artifacts masking weak echo returns. | Use Scenario: Active filtering and signal conditioning in oscilloscope vertical amplifiers and arbitrary waveform generator outputs. IC Role / Device Role / Timing Role: Precision gain block with flat frequency response and calibrated DC offset correction. Use Value: ±13.6 V output swing into 250 Ω supports ±10 V full-scale instrument ranges; 15 µV/°C drift minimizes calibration drift over lab temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4031CD | Lower bandwidth (100 MHz), higher noise (13 nV/√Hz), 10 mA quiescent current | Better suited for low-noise, medium-speed instrumentation where power is less constrained than video bandwidth | Select THS4031CD when 100 MHz bandwidth suffices and lower input noise is prioritized over speed. |
| OPA695IDBVR | Higher bandwidth (1.7 GHz), higher supply current (12.5 mA), different SO-6 package | Targeted at RF IF amplification and optical receiver TIA post-amplification, not video linearity | Choose OPA695IDBVR only for >500 MHz small-signal gain; THS4081CD remains superior for video differential gain/phase specs. |
Compared with THS4031CD and OPA695IDBVR, THS4081CD uniquely balances ultralow power (3.4 mA), broadcast-grade video linearity (0.01%/0.05°), and 175 MHz bandwidth-making it irreplaceable in cost-sensitive, thermally limited, and fidelity-critical video signal chains.
Availability
THS4081CD is available at Aetrix Electronics and suitable for professional video distribution, broadcast camera signal conditioning, medical ultrasound beamforming, and test & measurement instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for THS4081CD 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, embedded processing, and connectivity technologies, with decades of heritage in high-performance op-amps and signal chain solutions.
The THS4081CD belongs to TI's THS408x family of ultralow-power, high-speed voltage-feedback amplifiers engineered specifically for broadcast video, communications infrastructure, and precision instrumentation demanding simultaneous bandwidth, linearity, and efficiency.
FAQ
What is the maximum supply voltage rating for THS4081CD?
The THS4081CD has an absolute maximum supply voltage rating of ±16.5 V for dual-supply operation. Operation beyond this limit risks permanent damage. Recommended operating range is ±5 V to ±15 V. At ±15 V, the device delivers full specified performance including 175 MHz bandwidth and 230 V/µs slew rate. Exceeding ±16.5 V violates absolute maximum ratings regardless of duration or duty cycle.
Does THS4081CD support single-supply operation?
Yes, THS4081CD supports single-supply operation from 10 V to 30 V. Input common-mode range extends to within 1.2 V of the negative rail (e.g., 1.2 V above ground at 10 V supply), and output swing reaches within 1.2 V of each rail. For optimal video performance, dual-supply ±5 V or ±15 V is preferred to maintain symmetrical headroom and minimize distortion at full scale.
What is the thermal resistance (θJA) of THS4081CD in SOIC-8 package?
The THS4081CD in standard SOIC-8 (D) package has a junction-to-ambient thermal resistance (θJA) of 167°C/W when mounted on a JEDEC Low-K test board. With proper PCB layout-including 2 oz. copper, ground plane, and thermal vias-the effective θJA can be reduced to ~95°C/W. This enables continuous power dissipation up to 740 mW at TA = 25°C before reaching the 150°C junction limit.
Can THS4081CD drive a 75 Ω coaxial cable directly?
Yes, THS4081CD can drive a 75 Ω coaxial cable directly due to its 85 mA output current capability and robust output stage. For optimal impedance matching and stability, place a 75 Ω series resistor at the amplifier output (per Figure 41 in the datasheet). This isolates capacitive loading, suppresses high-frequency ringing, and establishes proper source termination-critical for maintaining 0.01% differential gain accuracy in video applications.
Is THS4081CD pin-compatible with THS4082CD?
No, THS4081CD (single-channel) and THS4082CD (dual-channel) are not pin-compatible. THS4081CD uses an 8-pin SOIC with NC pins at positions 1, 5, and 8, while THS4082CD places active pins (1OUT, 1IN−, 1IN+, VCC−, VCC+, 2OUT, 2IN−, 2IN+) across all eight positions. Board redesign is required to substitute one for the other; they share functional specifications but differ fundamentally in channel count and pin mapping.
THS4081CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 230V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 175 MHz
- Current - Input Bias:
- 1.2 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 3.4mA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4081CD FAQ
1.How can I place an order for THS4081CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4081CD 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 THS4081CD reliable?
The price and inventory of THS4081CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4081CD is usually 5 days.
3.What payment methods are accepted for THS4081CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4081CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4081CD?
THS4081CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4081CD 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 THS4081CD?
For technical support, including THS4081CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4081CD requirements.
6.How does Aetrix verify that THS4081CD is sourced from the original manufacturer or authorized distributors?
All THS4081CD 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 THS4081CD meets industry standards.
7.What is the process for return or replacement of THS4081CD?
All THS4081CD units undergo pre-shipment inspection (PSI). If there is an issue with THS4081CD, 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 THS4081CD part is unused and in its original packaging.
Return procedure for THS4081CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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