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Texas Instruments THS3125CDR
- Part No.:
- THS3125CDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3125CDR.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,836
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Product details
Overview
THS3125CDR from Texas Instruments is a dual-channel, bipolar-input, current-feedback amplifier optimized for low-noise, high-output-current video and instrumentation signal conditioning. It delivers 2.2-nV/√Hz voltage noise, 128-MHz –3-dB bandwidth (RL = 50 Ω), 1550-V/µs slew rate (G = 2), and 450-mA output drive - enabling clean 26-VPP differential swing into 50-Ω loads while maintaining –80-dBc THD at 1 MHz with 2-VPP output.
For engineers reviewing the THS3125CDR datasheet, THS3125CDR pinout, THS3125CDR application, or THS3125CDR equivalent, this page provides verified specifications, validated HTSSOP-14 pin mapping, real-world video distribution and piezo driver use cases, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The THS3125CDR implements a current-feedback architecture with separate high-impedance noninverting inputs and low-impedance inverting summing nodes per channel, enabling wide bandwidth independent of closed-loop gain. Its bipolar input stage delivers low voltage noise (2.2 nV/√Hz) and moderate current noise (2.9 pA/√Hz on IN+, 10.8 pA/√Hz on IN–).
It features an active shutdown mode controlled via SHUTDOWN and REF pins: logic-high SHUTDOWN relative to REF disables amplification and reduces quiescent current to 370 µA per channel; REF sets the reference level for threshold detection and must be externally biased between VCC– and (VCC+ – 4 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz at ±15 V, RL = 50 Ω, RF = 470 Ω, G = 2 - supports full HD video line driving without gain roll-off |
| Slew Rate | 1550 V/µs at ±15 V, G = 2, RL = 50 Ω - enables fast transient response for pulse and composite video signals |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level analog front-end stages |
| Output Current | 450 mA continuous per channel - drives four 75-Ω serially terminated video lines or heavy capacitive piezo loads |
| THD | –80 dBc at 1 MHz, 2-VPP, G = 2, ±15 V - meets broadcast-grade differential gain/phase error specs (<0.01%) |
| Shutdown Current | 370 µA per channel - reduces system power by >95% during idle periods without external biasing circuitry |
| Supply Range | ±5 V to ±15 V dual supply - compatible with legacy industrial and test equipment rails |
Pinout & Package
THS3125CDR is housed in a 14-pin HTSSOP PowerPAD™ package (PWP), 5.00 mm × 4.40 mm body size, with exposed thermal pad for enhanced heat dissipation (θJA = 37.5°C/W). The PowerPAD must be soldered to a PCB copper plane for reliable operation at full output current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting input, Channel 1 | High-impedance node for signal source connection; sets common-mode range (±12.7 V max at ±15 V supply) |
| 1 IN− | Inverting input, Channel 1 | Low-impedance summing node; connects to feedback network and load return path |
| 1 OUT | Output, Channel 1 | Capable of ±13.3 V swing into 50 Ω; requires proper termination to avoid instability |
| VCC− | Negative supply rail | Must be connected to stable low-impedance ground or negative rail; decoupling critical near pin |
| N/C (pins 5,7,8,10) | No internal connection | Not bonded; must remain unconnected or grounded only if required by PCB layout symmetry |
| REF | Shutdown reference voltage | Defines threshold for SHUTDOWN pin; externally biased between VCC− and (VCC+ − 4 V) |
| VCC+ | Positive supply rail | Accepts +5 V to +15 V; requires local 0.1-µF ceramic + 4.7-µF tantalum decoupling |
| 2 OUT | Output, Channel 2 | Independent output; crosstalk < –67 dBc at 1 MHz ensures channel isolation in dual-path systems |
| 2 IN− | Inverting input, Channel 2 | Separate summing node; no internal coupling to Channel 1 |
| 2 IN+ | Noninverting input, Channel 2 | Independent high-Z input; matched offset voltage (≤4 mV) enables precision differential applications |
| SHUTDOWN | Active-low enable control | Logic low (relative to REF) enables amplifier; logic high disables and reduces ICC to 370 µA |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise current-feedback architecture | 2.2-nV/√Hz voltage noise + 2.9-pA/√Hz (IN+) current noise enables high-fidelity signal amplification without gain-dependent bandwidth loss |
| 450-mA output drive capability | Sustains 26-VPP differential output into 50-Ω loads - sufficient for driving multiple video lines or high-capacitance piezoelectric actuators |
| Integrated shutdown with REF pin | Reduces per-channel ICC from 8.4 mA to 370 µA using a single logic-controlled pin and user-defined reference level - eliminates need for external MOSFET switches |
| –80-dBc THD at 1 MHz | Meets broadcast video distortion requirements (NTSC/PAL) and supports high-fidelity instrumentation signal chains up to 10 MHz |
| HTSSOP PowerPAD™ thermal package | 37.5°C/W junction-to-ambient thermal resistance allows full 450-mA output current at +85°C ambient when PowerPAD is properly soldered |
Applications
| Video Distribution | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Driving four 75-Ω serially terminated SD/HD video lines from a single source with minimal gain error. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier providing unity-gain buffered distribution with differential gain error <0.01% and phase error <0.011°. Use Value: Eliminates need for discrete op-amp arrays; maintains signal integrity across NTSC/PAL bandwidth without external equalization. |
Use Scenario: Amplifying low-amplitude sensor outputs (e.g., strain gauges, photodiodes) before ADC sampling in automated test equipment. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate gain block with precise DC accuracy (±25-mV VIO, 10-µV/°C drift) and wide dynamic range. Use Value: Preserves small-signal resolution while supporting fast step responses - enabling sub-µs settling for high-throughput measurements. |
| Piezo Actuator Driver | Line Driver for Industrial Bus |
Use Scenario: Driving high-voltage, high-capacitance piezoelectric transducers in ultrasonic cleaning or precision positioning systems. IC Role / Device Role / Timing Role: High-current, high-swing voltage amplifier delivering ±13.3 V into 100 nF loads with 1550-V/µs slew rate. Use Value: Achieves nanosecond-scale step response without ringing - critical for closed-loop position control fidelity. |
Use Scenario: Boosting analog signal levels on long industrial bus traces subject to EMI and impedance mismatch. IC Role / Device Role / Timing Role: Robust line driver with 450-mA short-circuit current, ±12.7-V input CMVR, and 60-dB PSRR rejecting supply noise. Use Value: Maintains signal integrity over 10+ meter cables without repeaters; immune to ground bounce in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3122CDR | Same core architecture but lacks shutdown pin and REF terminal; 7.2-mA quiescent current vs 370-µA in shutdown | Preferred where always-on operation is acceptable and board space allows SOIC-8 or HSOP-8 packaging | Select THS3122CDR for cost-sensitive, non-power-constrained designs requiring identical AC performance without shutdown control |
| THS3095DR | Single-channel, higher slew rate (2000 V/µs), lower noise (1.9 nV/√Hz), but limited to ±15-V max supply and no shutdown | Better suited for ultra-fast pulse amplification (e.g., laser diode drivers) where dual-channel integration is unnecessary | Choose THS3095DR when single-channel performance exceeds requirements and shutdown functionality is not needed |
Compared with THS3122CDR, THS3125CDR adds power management via REF/SHUTDOWN at the cost of two extra pins and larger HTSSOP-14 footprint; compared with THS3095DR, it trades peak slew rate for dual-channel integration and configurable low-power mode - making THS3125CDR optimal for space-constrained, battery-aware, multi-signal systems.
Availability
THS3125CDR is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, piezo actuator driving, and industrial line driving applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for THS3125CDR 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 company specializing in analog and embedded processing technologies, with leadership in high-performance amplifiers, data converters, and power management ICs.
The THS3125CDR belongs to TI's THS312x family of low-noise, high-output-current current-feedback amplifiers, designed specifically for demanding video, test equipment, and precision motion control applications where wide bandwidth, high drive, and low distortion are essential.
FAQ
What is the maximum safe output current for THS3125CDR?
The THS3125CDR supports continuous output current up to 450 mA per channel under recommended operating conditions (TA ≤ +85°C, PowerPAD thermally connected). Absolute maximum rating is 550 mA, but sustained operation above 450 mA risks exceeding junction temperature limits unless thermal design is enhanced beyond standard HTSSOP-14 layout guidelines.
Does THS3125CDR require external compensation for stability?
No, THS3125CDR is internally compensated for unity-gain stable operation with standard feedback configurations. Stability is ensured when using recommended resistor values (e.g., RF = 470 Ω for G = 2 into 50 Ω) and proper PCB layout - including ground plane under PowerPAD, short traces, and local decoupling at VCC+ and VCC− pins.
Can THS3125CDR operate from a single supply?
Yes, THS3125CDR supports single-supply operation from 10 V to 30 V (VCC+ to GND), with input common-mode range extending from VCC– (GND) to (VCC+ – 2.7 V) and output swing down to within ~1.5 V of GND. However, full symmetric performance (e.g., ±13.3 V swing) requires dual ±5 V to ±15 V supplies.
How does the REF pin function in THS3125CDR shutdown mode?
The REF pin sets the reference voltage for the SHUTDOWN comparator. When REF is biased between VCC– and (VCC+ – 4 V), the SHUTDOWN pin threshold becomes REF + 0.8 V (enable) and REF + 2 V (disable). Leaving REF unconnected defaults it to VCC–, causing SHUTDOWN to interpret logic-high signals relative to ground - a valid configuration for simple on/off control.
Is THS3125CDR pin-compatible with THS3122CDR?
No, THS3125CDR (HTSSOP-14) and THS3122CDR (SOIC-8/HSOP-8) have different pin counts, functions, and packages. THS3125CDR adds REF, SHUTDOWN, and three N/C pins not present on THS3122CDR. Direct replacement requires PCB redesign; functional equivalence exists only in AC performance and dual-channel topology - not mechanical or electrical pinout.
THS3125CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1550V/µs
- Gain Bandwidth Product:
- 138 MHz
- -3db Bandwidth:
- 160 MHz
- Current - Input Bias:
- 6 µA
- Voltage - Input Offset:
- 4.4 mV
- Current - Supply:
- 8.4mA (x2 Channels)
- Current - Output / Channel:
- 440 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:
- 14-SOIC
THS3125CDR FAQ
1.How can I place an order for THS3125CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3125CDR 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 THS3125CDR reliable?
The price and inventory of THS3125CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3125CDR is usually 5 days.
3.What payment methods are accepted for THS3125CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3125CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3125CDR?
THS3125CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3125CDR 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 THS3125CDR?
For technical support, including THS3125CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3125CDR requirements.
6.How does Aetrix verify that THS3125CDR is sourced from the original manufacturer or authorized distributors?
All THS3125CDR 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 THS3125CDR meets industry standards.
7.What is the process for return or replacement of THS3125CDR?
All THS3125CDR units undergo pre-shipment inspection (PSI). If there is an issue with THS3125CDR, 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 THS3125CDR part is unused and in its original packaging.
Return procedure for THS3125CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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