THS3121IDG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments THS3121IDG4 is a single current-feedback operational amplifier in an 8-pin SOIC package with ±15 V dual supply or 30 V single supply operation. Delivers 60 dB minimum CMRR, frequency compensation, and 13 mV max input offset voltage for high-speed signal conditioning. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- THS3121IDG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of THS3121IDG4?
- Current-feedback architecture delivers high slew rate and wideband gain-bandwidth performance for driving high-speed ADC inputs and video cables
- Wide supply range of ±15 V dual or 30 V single supply with 60 dB minimum CMRR suits precision differential amplifier and instrumentation designs
- 8-pin SOIC package with frequency compensation supports stable closed-loop operation across a wide gain range without external compensation networks
What is THS3121IDG4 used for?
The THS3121IDG4 is designed for high-speed analog signal conditioning in test-and-measurement instruments, video distribution amplifiers, and active filter stages requiring current-feedback bandwidth with ±15 V headroom. Its current-feedback topology maintains nearly constant bandwidth independent of closed-loop gain, making it well-suited for line drivers and ADC input buffers in data-acquisition systems. The 8-pin SOIC package fits standard single-supply or dual-supply op-amp footprints, enabling drop-in use in RF-to-baseband chains and pulse amplifier circuits.
What are the specifications of THS3121IDG4?
| YTEOL | 0 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | CURRENT-FEEDBACK |
| Common-mode Reject Ratio-Min | 60dB |
| Common-mode Reject Ratio-Nom | 70dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 13000 µV |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Low-Bias | NO |
| Low-Offset | NO |
| Micropower | NO |
| Neg Supply Voltage Limit-Max | 15V |
| Neg Supply Voltage-Nom (Vsup) | -5 V |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Nom | 900V/us |
| Supply Current-Max | 11mA |
| Supply Voltage Limit-Max | 33V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the THS3121IDG4 datasheet?
THS3121IDG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for THS3121IDG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What supply voltage configuration does THS3121IDG4 require for single and dual supply operation?
THS3121IDG4 supports ±15 V dual-supply operation for full 30 V headroom or a single 30 V supply when a split rail is unavailable. This flexibility lets designers use the same device in both benchtop instrument power supplies and single-rail embedded systems, accommodating output swings approaching ±13 V under typical load conditions.
How does the current-feedback architecture of THS3121IDG4 benefit high-gain ADC driver stages?
Current-feedback amplifiers like THS3121IDG4 maintain nearly constant -3 dB bandwidth regardless of closed-loop gain, unlike voltage-feedback designs whose gain-bandwidth product limits bandwidth at gains above 10 V/V. This means a gain of 20 dB does not halve the usable bandwidth, enabling ADC drivers to pass full signal bandwidth at 60 dB CMRR with low distortion.
What is the input offset voltage specification of THS3121IDG4 and when does it matter?
THS3121IDG4 specifies a maximum input offset voltage of 13 mV (13000 µV). For DC-coupled precision measurement chains this offset may require external trimming, but for AC-coupled video or RF signal paths operating above 1 MHz the offset has negligible effect and does not impact dynamic range within the amplifier's 60 dB CMRR specification.
For compact PCB layouts, what footprint does THS3121IDG4 occupy in the SOIC-8 package?
The R-PDSO-G8 SOIC-8 package used by THS3121IDG4 occupies approximately 5 mm x 4 mm on the PCB with 1.27 mm pin pitch, a well-established footprint that fits standard SOIC-8 land patterns on 2-layer boards. This makes the device easy to route alongside bypass capacitors and feedback resistors without requiring HDI vias or complex impedance-controlled traces.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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