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Texas Instruments THS3120ID
- Part No.:
- THS3120ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3120ID.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,494
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Product details
Overview
THS3120ID from Texas Instruments is a low-noise, high-output-current, current-feedback operational amplifier designed for video distribution, capacitive load driving, and high-speed pin driver applications. It delivers 475 mA output current, 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. Its industrial temperature range (–40°C to +85°C) supports embedded video infrastructure and broadcast equipment.
For engineers reviewing the THS3120ID datasheet, THS3120ID pinout, THS3120ID application, or THS3120ID equivalent, this page provides verified electrical specifications, SOIC-8 package layout, differential gain/phase performance across multiple loads, power-down timing characteristics, and validated alternatives for video amplification and high-current buffer designs.
Technical Context
The THS3120ID uses a current-feedback architecture enabling wide bandwidth and high slew rate independent of closed-loop gain. Its transimpedance gain of 1.9 MΩ (±15 V) and input voltage noise of 2.5 nV/√Hz support precision analog signal conditioning in demanding video and test equipment.
It integrates a dedicated PD (power-down) pin with defined enable/disable thresholds relative to REF, allowing controlled shutdown without external logic. The REF pin operates from VS– to (VS+ – 4 V), supporting flexible biasing in dual-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 120 MHz at G = 2, RL = 50 Ω - enables full HD video signal amplification without roll-off |
| Slew rate | 1700 V/μs at ±15 V - supports fast transient response for 8-VPP video steps |
| Output current | ±475 mA sourcing/sinking - drives up to eight 150-Ω video loads simultaneously |
| Differential gain error | 0.007% (PAL/NTSC) - meets broadcast-grade video fidelity requirements |
| Power-down quiescent current | 4 μA max at TA = +85°C - reduces system standby power in multi-channel video routers |
| Input voltage noise | 2.5 nV/√Hz - preserves SNR in low-level analog signal paths |
| Operating temperature | –40°C to +85°C - qualified for industrial video processing and surveillance hardware |
Pinout & Package
THS3120ID is housed in an 8-pin SOIC (D) package with exposed thermal pad (non-electrical). 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 PowerPAD enhances thermal dissipation but must be soldered to a copper plane for rated power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Unused; leave unconnected or ground for mechanical stability |
| Pin 2 (VIN−) | Inverting input | Current-feedback node; high impedance (41 MΩ) and low capacitance (0.4 pF) |
| Pin 3 (VIN+) | Noninverting input | High-Z input with 1 pA/√Hz current noise; common-mode range ±12.7 V (±15 V supply) |
| Pin 4 (VS−) | Negative supply rail | Supports ±5 V to ±15 V operation; connects to system ground or negative rail |
| Pin 5 (PD) | Power-down control | Active-low enable: ≤REF + 0.8 V enables shutdown; ≥REF + 2 V disables |
| Pin 6 (VS+) | Positive supply rail | Accepts up to ±15 V; PSRR > 69 dB minimizes supply ripple coupling |
| Pin 7 (VOUT) | Amplifier output | Capable of ±13.5 V swing into 50 Ω; 0.04 Ω closed-loop output impedance at 1 MHz |
| Pin 8 (NC) | No internal connection | Unused; may be grounded for EMI suppression |
Key Features
| Feature | Design Value |
|---|---|
| Power-down functionality | Reduces quiescent current from 7 mA to 4 μA, enabling dynamic power management in multi-channel video systems |
| Low differential phase error | 0.018° (NTSC) ensures minimal color timing skew across broadcast video signals |
| High 0.1-dB flat bandwidth | 90 MHz at G = 2 guarantees amplitude consistency across 8-MHz NTSC/PAL baseband spectrum |
| Robust capacitive load drive | Stable with ≥100 pF loads using recommended RISO (20 Ω), eliminating need for external isolation networks |
| Wide supply range | Operates from ±5 V to ±15 V, allowing reuse across legacy and modern video signal chain voltages |
Applications
| Video Distribution Amplifier | High-Speed Pin Driver |
|---|---|
|
Use Scenario: Distributing composite video signals to eight monitors in broadcast control rooms. IC Role / Device Role / Timing Role: Current-feedback video buffer with gain = 2, driving multiple 75-Ω coaxial lines. Use Value: Maintains 0.007% differential gain and 0.018° phase error across all loads, preserving color fidelity without external equalization. |
Use Scenario: Driving gate inputs of power FETs in high-frequency switching power supplies. IC Role / Device Role / Timing Role: High-current, low-latency buffer delivering 475 mA peak current with 10 ns rise/fall time. Use Value: Enables <10 ns edge transitions into 1000-pF gate capacitance, reducing switching losses and improving efficiency. |
| Capacitive Load Driver | Test Equipment Signal Generator Output Stage |
|
Use Scenario: Driving long PCB traces or cables with >100 pF total capacitance in automated test fixtures. IC Role / Device Role / Timing Role: Unity-gain stable buffer with integrated RISO compensation network. Use Value: Eliminates oscillation risk without external components, simplifying layout and reducing BOM count. |
Use Scenario: Final output stage of a 10-MHz arbitrary waveform generator requiring low distortion and high drive strength. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate amplifier delivering 2 VPP into 50 Ω with –51 dBc 2nd harmonic. Use Value: Achieves <–50 dBc harmonic distortion at 10 MHz, meeting IEEE 1149.4 boundary-scan stimulus accuracy requirements. |
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 |
|---|---|---|---|
| THS3121ID | No power-down pin; 10 μA higher quiescent current; identical AC performance and pinout | Lacks dynamic power control; suitable only where continuous operation is required | Select when power-down functionality is unnecessary and lowest possible offset drift is prioritized |
| OPA695ID | Higher 3 GHz gain-bandwidth product but lower 190 mA output current; no power-down feature | Better for RF IF amplification; insufficient for multi-load video distribution | Prefer for wideband, low-capacitance applications where output current < 250 mA suffices |
Compared with THS3121ID, THS3120ID adds power-down capability at minor cost in quiescent current overhead; compared with OPA695ID, it trades bandwidth for robust video-load drive strength and thermal resilience in industrial environments.
Availability
THS3120ID is available at Aetrix Electronics and suitable for video distribution amplifiers, high-speed pin drivers, and capacitive load drivers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for THS3120ID 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 amplifier design and manufacturing.
The THS3120ID belongs to TI's THS31xx current-feedback op-amp family, engineered specifically for broadcast video infrastructure, test instrumentation, and high-current analog signal routing where bandwidth, drive strength, and video fidelity are critical.
FAQ
What is the maximum number of 150-Ω video loads the THS3120ID can drive while maintaining specified differential gain?
The THS3120ID maintains 0.007% differential gain error with up to eight 150-Ω loads under standard conditions (G = 2, RF = 649 Ω, VS = ±15 V). Performance graphs confirm worst-case degradation remains within specification through eight loads, making THS3120ID ideal for multi-monitor broadcast distribution systems.
Does the THS3120ID require external compensation when driving a 100-pF capacitive load?
Yes - the THS3120ID requires a series isolation resistor (RISO) of 20 Ω when driving 100-pF loads to ensure stability. This value is explicitly recommended in the datasheet's "Recommended RISO vs Capacitive Load" curve (Figure 8), and omitting it risks peaking or oscillation in the closed-loop response.
What is the turn-on time delay of the THS3120ID power-down function?
The THS3120ID exhibits a 4 μs turn-on time delay - defined as the time from PD pin transition to 90% of final output voltage - under typical conditions (VS = ±15 V). This parameter is measured and specified in the "Power-Down Characteristics" table on page 5 of the SLOS420E datasheet.
Can the THS3120ID operate from a single +10 V supply?
Yes - the THS3120ID supports single-supply operation from +10 V to +30 V. At +10 V, its output voltage swing is ±3.7 V into 1 kΩ (min), and it delivers 310 mA sourcing current into 10 Ω, enabling use in compact, low-voltage video interface modules without dual-rail generation.
How does the REF pin function in the THS3120ID power-down circuit?
The REF pin sets the reference threshold for the PD pin: power-down activates when PD ≤ REF + 0.8 V and deactivates when PD ≥ REF + 2 V. REF itself operates from VS– to (VS+ – 4 V), allowing flexible biasing - e.g., tying REF to VS– enables simple active-low PD control with 0 V = enable, +3.3 V = disable.
THS3120ID 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:
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS3120ID FAQ
1.How can I place an order for THS3120ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3120ID 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 THS3120ID reliable?
The price and inventory of THS3120ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3120ID is usually 5 days.
3.What payment methods are accepted for THS3120ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3120ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3120ID?
THS3120ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3120ID 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 THS3120ID?
For technical support, including THS3120ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3120ID requirements.
6.How does Aetrix verify that THS3120ID is sourced from the original manufacturer or authorized distributors?
All THS3120ID 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 THS3120ID meets industry standards.
7.What is the process for return or replacement of THS3120ID?
All THS3120ID units undergo pre-shipment inspection (PSI). If there is an issue with THS3120ID, 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 THS3120ID part is unused and in its original packaging.
Return procedure for THS3120ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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