Differential amplifier with 225 MHz GBW and 52 V/µs slew rate
The THS4131ID is a single-circuit differential amplifier from Texas Instruments, delivering a gain bandwidth product of 225 MHz and a -3 dB bandwidth of 150 MHz, with a slew rate of 52 V/µs. The differential output type means it directly drives ADC inputs or twisted-pair lines without extra conversion — the output is the difference between the two output pins, rejecting common-mode noise from the supply or ground bounce.
Supply, temperature, and package fit
Operating from a 4 V to 33 V supply span, the THS4131ID covers single-supply 5 V rails up to ±15 V bipolar supplies, with an industrial temperature range of -40°C to 85°C. Housed in an 8-SOIC (0.154", 3.90 mm width) surface-mount package, the footprint matches the standard SOIC-8 land pattern — no special pad geometry or thermal vias required for most signal-chain applications. The 12.3 mA supply current and 85 mA output current per channel give a clear power budget: at ±5 V rails, the quiescent dissipation is about 123 mW, leaving headroom for driving 50-ohm or 75-ohm loads in video or communications interfaces.
Input offset and bias — what they mean for precision
Input offset voltage is 200 µV typical — for a gain of 10, this contributes 2 mV of DC error at the output, negligible for most AC-coupled or high-speed paths but worth budgeting in a DC-accurate front-end. Input bias current is 2 µA typical, which is higher than a JFET or CMOS op-amp — if the source impedance exceeds a few kilo-ohms, the bias current drop across the source resistor adds a DC offset that must be nulled or matched.