Texas Instruments THS3125IPWP

Overview

THS3125IPWP from Texas Instruments is a dual-channel, bipolar-input, current-feedback amplifier optimized for high-speed, 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), and 2.2-nV/√Hz voltage noise - enabling clean amplification of 2 VPP signals at 1 MHz with –80 dBc THD in video distribution systems.

For engineers reviewing the THS3125IPWP datasheet, THS3125IPWP pinout, THS3125IPWP application, or THS3125IPWP equivalent, key selection criteria include shutdown-enabled power management (370 µA quiescent current), HTSSOP-14 PowerPAD™ thermal performance (θJA = 37.5°C/W), dual-channel crosstalk (–67 dBc), and ±5 V to ±15 V dual-supply operation.

Technical Context

The THS3125IPWP implements a current-feedback architecture with separate high-impedance noninverting inputs (1 IN+, 2 IN+) and low-impedance inverting inputs (1 IN−, 2 IN−), enabling wide bandwidth independent of closed-loop gain. Its transimpedance gain stage drives a Class AB output stage capable of ±230 mA into 50 Ω while maintaining <0.01% differential gain error across NTSC/PAL video loads.

Shutdown control is implemented via a dedicated SHUTDOWN pin referenced to the REF pin, with defined enable/disable thresholds relative to REF (REF + 0.8 V / REF + 2 V). The REF pin supports external biasing to set precise shutdown thresholds, and the device enters low-power mode within 500 µs of disable assertion.

Key Specifications

Pinout & Package

THS3125IPWP is housed in a thermally enhanced HTSSOP-14 (PWP) package with exposed PowerPAD™ on the underside, requiring PCB thermal pad connection for rated 3.3 W power dissipation (θJA = 37.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed current-feedback amplifier applications.

Compared with THS3125CD and THS3095ID, THS3125IPWP uniquely combines dual-channel integration, thermal-robust HTSSOP PowerPAD™ packaging, and shutdown-controlled power scaling - making it the sole option for compact, high-reliability video distribution and portable instrumentation designs demanding both performance and efficiency.

Availability

THS3125IPWP is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, line drivers for high-speed analog interfaces, and piezo actuator drivers requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for THS3125IPWP 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 THS3125IPWP belongs to TI's THS312x family of low-noise, high-output-current current-feedback amplifiers, engineered specifically for broadcast video, test equipment, and precision analog signal routing where distortion, speed, and thermal reliability are critical.

FAQ

What is the maximum safe output current for THS3125IPWP in continuous operation?

The THS3125IPWP is rated for ±450 mA peak output current per channel. For continuous DC or high-duty-cycle operation into 50 Ω, thermal limits apply: with proper PowerPAD™ soldering to a 2-in² copper pour, it sustains ±360 mA (12 VPP into 50 Ω) at TA = +85°C. Exceeding this risks junction temperature >150°C, triggering thermal shutdown or permanent damage. Always verify PCB thermal design using TI's SLMA002 PowerPAD guidelines before final layout.

How does the REF pin affect THS3125IPWP shutdown behavior?

The REF pin sets the reference voltage for the THS3125IPWP shutdown comparator. When left floating, REF defaults to VCC−, establishing fixed thresholds (enable ≤ REF + 0.8 V, disable ≥ REF + 2 V). Driving REF externally (e.g., to 2.5 V) shifts both thresholds proportionally, enabling adaptive power control in systems with variable supply rails. Incorrect REF biasing - such as connecting to VCC+ - violates absolute maximum ratings and may damage the internal reference circuitry of THS3125IPWP.

Can THS3125IPWP drive 75-Ω video loads directly without external termination?

No. THS3125IPWP requires external 75-Ω series termination at the output to match coaxial cable impedance and prevent reflections. Its output stage is designed for 50-Ω loads (e.g., lab equipment inputs), not 75-Ω broadcast standards. To drive 75-Ω video lines, use a 25-Ω series resistor between THS3125IPWP output and cable - forming a 50-Ω source impedance that, combined with 75-Ω load, yields correct voltage division and <0.01% differential gain error as verified in THS3125IPWP's datasheet Figure 30.

What is the small-signal bandwidth of THS3125IPWP at ±5-V supply?

At ±5-V supply, THS3125IPWP achieves 126 MHz (–3 dB) with RF = 470 Ω and G = 2 into RL = 50 Ω, per Section 7.4 of the datasheet. This is 2 MHz less than its ±15-V performance (128 MHz) due to reduced internal bias current and transconductance. Bandwidth remains stable across gain settings - e.g., 138 MHz at G = 1 (RF = 50 Ω) - confirming true current-feedback behavior essential for THS3125IPWP's video and instrumentation use cases.

Does THS3125IPWP support single-supply operation?

Yes, THS3125IPWP operates from a single supply of 10 V to 30 V (VCC+ to VCC−), with VCC− tied to ground. Input common-mode range extends to within 2.5 V of either rail (e.g., 0 V to 7.5 V at VCC = 10 V), and output swing reaches within 1.2 V of each rail into 1 kΩ. However, THS3125IPWP's optimal video performance (e.g., –80 dBc THD) is specified only under dual-supply conditions (±5 V to ±15 V); single-supply use requires careful level-shifting and may degrade distortion specs.