Texas Instruments THS3125IPWPR

Overview

THS3125IPWPR from Texas Instruments is a dual-channel, bipolar-input current feedback amplifier optimized for high-output-current, low-distortion video and instrumentation signal conditioning. It delivers 450 mA output drive, 128-MHz –3-dB bandwidth (RL = 50 Ω), 1550-V/µs slew rate (G = 2), 2.2-nV/√Hz voltage noise, and features a low-power shutdown mode reducing quiescent current to 370 µA per channel - enabling use in multi-channel video distribution systems with serially terminated 75-Ω loads.

For engineers reviewing the THS3125IPWPR datasheet, THS3125IPWPR pinout, THS3125IPWPR application, or THS3125IPWPR equivalent, key selection criteria include its HTSSOP-14 PowerPAD™ package thermal performance (θJA = 37.5°C/W), shutdown threshold referencing via REF pin, differential gain error < 0.01% at NTSC/PAL, and compatibility with ±5 V to ±15 V dual supplies or 10–30 V single supply.

Technical Context

The THS3125IPWPR implements a current feedback architecture with high-impedance noninverting inputs and low-impedance inverting inputs, enabling wide bandwidth independent of closed-loop gain. Its transimpedance gain stage drives a Class-AB output stage capable of ±220 mA into 50 Ω while maintaining –80 dBc THD at 1 MHz (2 VPP, G = 2).

Shutdown control is implemented via a dedicated SHUTDOWN pin referenced to the externally configurable REF pin, allowing precise enable/disable thresholds (REF + 0.8 V enable, REF + 2 V disable). The REF pin supports operation across the full VCC– to (VCC+ – 4 V) range, enabling flexible biasing in mixed-supply systems.

Key Specifications

Pinout & Package

THS3125IPWPR is housed in a thermally enhanced HTSSOP-14 PowerPAD™ package (5.00 mm × 4.40 mm), featuring an exposed thermal pad on the underside that must be soldered to a PCB copper pour for effective heat dissipation (θJA = 37.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current feedback amplifier applications.

Compared with THS3125CD and THS3095ID, THS3125IPWPR uniquely combines dual-channel operation, PowerPAD™ thermal performance, and programmable shutdown - making it the only option for thermally demanding, multi-channel video or instrumentation systems requiring dynamic power management.

Availability

THS3125IPWPR is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, industrial line drivers, and piezo actuator driver applications requiring stable component supply, long-term manufacturability, and TI-qualified automotive/industrial temperature grade (–40°C to +85°C).

Supply support for THS3125IPWPR 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and communications markets.

The THS312x family was developed specifically for high-fidelity, high-current analog signal routing in broadcast video infrastructure and precision test equipment - emphasizing low noise, wide bandwidth, and robust output drive under reactive loads.

FAQ

What is the maximum safe output current for THS3125IPWPR?

The THS3125IPWPR is rated for ±450 mA peak output current per channel under recommended operating conditions. Absolute maximum rating is ±550 mA, but sustained operation above ±450 mA risks thermal overload unless PCB thermal design meets TI's PowerPAD™ guidelines (≥6 thermal vias to inner ground plane). Derating is required above +70°C ambient.

Does THS3125IPWPR support single-supply operation?

Yes, THS3125IPWPR supports single-supply operation from 10 V to 30 V. Input common-mode range extends to within 2.5 V of either rail (e.g., 0 V to +7.5 V at +10 V supply), and output swing reaches within 1.2 V of each rail into 50 Ω. For optimal performance, bias inputs mid-rail using precision resistors and bypass REF to mid-supply if shutdown is unused.

How does the REF pin affect THS3125IPWPR shutdown behavior?

The REF pin sets the voltage reference for the SHUTDOWN pin threshold. Enable occurs when SHUTDOWN ≤ (REF + 0.8 V); disable occurs when SHUTDOWN ≥ (REF + 2 V). If REF is unconnected, it defaults to VCC−, making the default enable threshold VCC− + 0.8 V and disable threshold VCC− + 2 V - ensuring reliable startup with standard logic levels.

Can THS3125IPWPR drive 50-Ω loads directly without external components?

Yes, THS3125IPWPR is designed to drive 50-Ω loads directly, delivering 26-VPP output swing (±13 V) with <0.03% differential gain error. However, proper PCB layout is mandatory: place 50-Ω series termination at the amplifier output, route with controlled impedance, and minimize stub length to prevent reflections that degrade THD and bandwidth.

What is the thermal resistance (θJA) of THS3125IPWPR in its HTSSOP-14 PowerPAD™ package?

The THS3125IPWPR has a junction-to-ambient thermal resistance (θJA) of 37.5°C/W when mounted on a JEDEC-standard high-K test PCB with the PowerPAD™ soldered to a minimum 1-in² copper pour. This value assumes ≥6 thermal vias (0.3-mm diameter) connecting the pad to inner ground planes. Without proper thermal design, θJA degrades to >100°C/W, risking thermal shutdown above 1.2 W dissipation.