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Texas Instruments THS3120CD
- Part No.:
- THS3120CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3120CD.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,868
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Product details
Overview
THS3120CD from Texas Instruments is a low-noise, high-output-current, current-feedback operational amplifier optimized for video distribution and high-speed analog signal conditioning. It delivers 475 mA output drive, 1700 V/μs slew rate at ±15 V supply, 120 MHz small-signal bandwidth (G = 2), and features a dedicated power-down pin for quiescent current reduction to 4 μA. It operates across ±5 V to ±15 V supplies and maintains <0.007% differential gain error in PAL/NTSC video systems driving up to eight 150 Ω loads.
For engineers reviewing the THS3120CD datasheet, THS3120CD pinout, THS3120CD application, or THS3120CD equivalent, this page provides verified technical context, package mapping, real-world video and capacitive-load driving use cases, and validated alternative options - all grounded in TI's SLOS420E production data sheet and official ordering documentation.
Technical Context
The THS3120CD uses a current-feedback architecture with separate high-impedance noninverting input (41 MΩ) and low-impedance inverting input, enabling wide bandwidth independent of closed-loop gain. Its transimpedance gain reaches 1.9 MΩ at ±15 V, supporting stable operation into reactive or capacitive loads up to 100 pF when paired with recommended RISO compensation (e.g., 20 Ω for 100 pF).
It integrates a dedicated PD (power-down) pin that disables the amplifier core while maintaining REF pin functionality (VS– to VS+ – 4 V range). Power-down activation requires PD ≤ REF + 0.8 V, with turn-on delay under 4 μs and quiescent current dropping to 4 μA at TA = +85°C - critical for burst-mode video transmission and energy-sensitive analog front ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW | 120 MHz at G = 2, RL = 50 Ω, ±15 V - enables full HD video bandwidth without gain peaking. |
| Slew rate | 1700 V/μs at VO = 8 VPP - supports fast transient response for pulse and composite video signals. |
| Output current | ±475 mA sourcing/sinking into RL = 25 Ω - drives multiple 75 Ω video lines or heavy capacitive loads. |
| Differential gain error | 0.007% (PAL/NTSC, G = 2, RL = 150 Ω) - preserves color fidelity in broadcast-quality video distribution. |
| Input voltage noise | 2.5 nV/√Hz above 20 kHz - minimizes added noise in baseband analog signal chains. |
| Power-down current | 4 μA max at +85°C - reduces system standby power in multi-channel video switchers. |
| Supply range | ±5 V to ±15 V - compatible with legacy analog video rails and modern dual-rail industrial supplies. |
Pinout & Package
THS3120CD is housed in an SOIC-8 (D) package with exposed thermal pad (non-electrical per TI SLMA002). Pin 1 is NC (no internal connection); Pin 5 is PD (power-down control); Pin 6 is VS+; Pin 7 is VOUT; Pin 8 is NC. The REF pin (Pin 1 on THS3121, not present on THS3120CD) is omitted - confirming THS3120CD lacks reference buffer functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | NC | No internal connection - must be left floating or tied to ground per layout best practice. |
| Pin 2 | VIN− | Inverting input - low impedance node; connects to feedback network (e.g., 649 Ω resistor). |
| Pin 3 | VIN+ | Noninverting input - high-impedance (41 MΩ); accepts video source or DC bias reference. |
| Pin 4 | VS− | Negative supply rail - requires low-ESR decoupling (e.g., 100 nF ceramic + 10 μF tantalum). |
| Pin 5 | PD | Power-down enable - logic-low (≤ REF + 0.8 V) disables output stage; high-Z otherwise. |
| Pin 6 | VS+ | Positive supply rail - supports ±5 V to ±15 V operation; decouple identically to VS−. |
| Pin 7 | VOUT | Amplified output - capable of ±13.5 V swing into 50 Ω; drives coaxial cable or FET gates directly. |
| Pin 8 | NC | No internal connection - no routing required; may serve as thermal relief pad anchor. |
Key Features
| Feature | Design Value |
|---|---|
| Power-down pin | Reduces quiescent current to 4 μA at +85°C - enables dynamic power gating in multi-channel video routers. |
| Current-feedback topology | 120 MHz bandwidth maintained at G = 2, 5, and 10 - eliminates gain-bandwidth trade-off in gain-setting networks. |
| High output current drive | ±475 mA into 25 Ω - eliminates need for external buffer stages when driving multiple 75 Ω video loads. |
| Low differential phase error | 0.018° (NTSC) at G = 2 - preserves timing alignment between luminance and chrominance components. |
| Wide supply flexibility | Operates from ±5 V (e.g., USB-powered test gear) to ±15 V (legacy broadcast equipment) - single BOM across platforms. |
Applications
| Video Distribution Amplifier | Capacitive Load Driver |
|---|---|
Use Scenario: Distributing composite NTSC/PAL video from one source to eight monitors over 75 Ω coaxial cables. IC Role / Device Role / Timing Role: High-current, low-distortion buffer amplifying and isolating the source signal while maintaining flat frequency response to 90 MHz (0.1-dB bandwidth). Use Value: Achieves <0.007% differential gain and <0.018° differential phase error across all eight outputs - preserving broadcast-grade color fidelity without post-compensation. |
Use Scenario: Driving 100 pF gate capacitance of power MOSFETs in high-frequency Class-D audio or motor gate drivers. IC Role / Device Role / Timing Role: Fast-settling, high-slew-rate voltage driver delivering precise gate voltage transitions with <11 ns 0.1% settling time. Use Value: Enables clean 1700 V/μs edge rates into capacitive loads when used with TI-recommended RISO = 20 Ω - prevents ringing and overshoot. |
| Power FET Driver | Pin Driver for High-Speed Test Equipment |
Use Scenario: Providing gate drive for GaN HEMTs in 1–5 MHz resonant converters where fast dV/dt and low shoot-through risk are critical. IC Role / Device Role / Timing Role: Low-output-impedance (0.04 Ω) voltage source delivering ±13.5 V into 50 Ω load - ensures rapid MOSFET turn-on/turn-off. Use Value: Delivers 475 mA peak current with <10 ns rise/fall time - reduces switching losses and improves converter efficiency. |
Use Scenario: Generating precise, high-fidelity stimulus waveforms in automated test equipment (ATE) pin electronics. IC Role / Device Role / Timing Role: Wideband, low-noise amplifier shaping pulses with <52 ns 0.01% settling time and <50 dBc harmonic distortion at 10 MHz. Use Value: Maintains signal integrity for 100 Mbps digital pattern generation by minimizing jitter-inducing nonlinearities and noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current, current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3121CD | Lacks power-down pin; includes REF pin for buffered reference output; identical AC/DC specs otherwise. | Preferred where reference buffering is needed (e.g., multi-amplifier synchronized biasing), but unsuitable for power-gated designs. | Select THS3121CD only if REF functionality is required and power-down is unnecessary. |
| OPA695ID | Higher 1.7 GHz gain-bandwidth, lower 1.6 nV/√Hz noise, but only 190 mA output drive and no power-down feature. | Better for RF IF amplification or low-noise preamp stages; insufficient for multi-load video or heavy capacitive drive. | Choose OPA695ID for GHz-range small-signal gain; avoid for >200 mA load or power-aware video systems. |
Compared with THS3121CD and OPA695ID, THS3120CD uniquely balances high output current (475 mA), integrated power-down (4 μA), and video-optimized linearity - making it the only option among the three qualified for energy-efficient, multi-channel broadcast video distribution.
Availability
THS3120CD is available at Aetrix Electronics and suitable for video distribution amplifiers, capacitive load drivers, power FET gate drivers, and high-speed pin electronics requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for THS3120CD 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-speed op-amps and precision signal chain solutions.
The THS3120CD belongs to TI's THS31xx current-feedback op-amp family, engineered specifically for demanding video, test equipment, and high-current analog interface applications where speed, drive strength, and low distortion are essential.
FAQ
What is the maximum output current capability of the THS3120CD?
The THS3120CD delivers ±475 mA of continuous output current when sinking or sourcing into a 25 Ω load at ±15 V supply, as specified in the Electrical Characteristics table (TA = +85°C, MIN condition). This enables direct driving of multiple 75 Ω video lines or power MOSFET gates without external buffers - a key differentiator versus general-purpose op-amps.
Does the THS3120CD support single-supply operation?
Yes, the THS3120CD supports single-supply operation from 10 V to 30 V, as confirmed in the Recommended Operating Conditions table. However, its input common-mode range is limited to ±2.7 V at ±5 V supply and ±12.7 V at ±15 V supply - meaning level-shifting or biasing is required for true rail-to-rail input in single-supply configurations.
How does the power-down feature of the THS3120CD function?
The THS3120CD's PD pin activates power-down mode when held ≤ REF + 0.8 V (REF = VS– to VS+ – 4 V). In this state, quiescent current drops to 4 μA at +85°C, output is disabled, and turn-on delay is ≤4 μs. The device defaults to active (ON) if PD is left unconnected - no pull-up/down required for normal operation.
What is the small-signal bandwidth of the THS3120CD at G = 2 and ±15 V supply?
At G = 2, RF = 649 Ω, RL = 50 Ω, and ±15 V supply, the THS3120CD achieves a small-signal bandwidth of 120 MHz (–3 dB point), with 90 MHz of 0.1-dB flatness - critical for preserving amplitude accuracy across the entire NTSC/PAL video spectrum (0–5.5 MHz) and beyond.
Is the THS3120CD pin-compatible with the THS3121CD?
No, the THS3120CD and THS3121CD are not pin-compatible. THS3120CD uses Pin 5 for PD (power-down), while THS3121CD uses Pin 5 for REF (reference output). Their pinouts differ in function assignment - using them interchangeably would result in incorrect biasing or disabled functionality.
THS3120CD 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:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1700V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 MHz
- Current - Input Bias:
- 3 µA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- 490 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
THS3120CD FAQ
1.How can I place an order for THS3120CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3120CD 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 THS3120CD reliable?
The price and inventory of THS3120CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3120CD is usually 5 days.
3.What payment methods are accepted for THS3120CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3120CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3120CD?
THS3120CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3120CD 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 THS3120CD?
For technical support, including THS3120CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3120CD requirements.
6.How does Aetrix verify that THS3120CD is sourced from the original manufacturer or authorized distributors?
All THS3120CD 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 THS3120CD meets industry standards.
7.What is the process for return or replacement of THS3120CD?
All THS3120CD units undergo pre-shipment inspection (PSI). If there is an issue with THS3120CD, 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 THS3120CD part is unused and in its original packaging.
Return procedure for THS3120CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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