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Microchip Technology MCP6S91T-E/SN — Memory (DRAM / SRAM / Flash / EEPROM)
Microchip Technology

MCP6S91T-E/SN Programmable Gain Op-Amp, 18 MHz, 22 V/µs

MPNMCP6S91T-E/SN
End of Life

Microchip MCP6S91T-E/SN, single programmable gain amplifier, 18 MHz -3dB bandwidth, 22 V/µs slew rate, rail-to-rail output, 2.5 V to 5.5 V supply, 8-SOIC, -40 to 125 °C.

$1.18Ref. price · indicative, final on quote
MCP6S91T-E/SN datasheet
Packaging8-SOIC (0.154", 3.90mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

MCP6S91T-E/SN Technical Specifications
ParameterValue
Output typeRail-to-Rail
Mounting typeSurface Mount
Amplifier typeProgrammable Gain
Voltage - input offset400 µV
Voltage - supply span5.5 V
Current - supply1mA
Current - input bias1 pA
Current - output (Channel)25 mA
Operating temperature-40°C ~ 125°C
-3db bandwidth18 MHz
PackageTape & Reel (TR); Cut Tape (CT)
Slew rate22V/µs
Case8-SOIC (0.154\", 3.90mm Width)
Number of circuits1

Product details

Programmable gain without the resistor network

The Microchip MCP6S91T-E/SN is a single-channel programmable gain amplifier (PGA) that replaces the traditional op-amp plus external resistor-ladder gain-setting circuit. It integrates an SPI-programmable gain stage with eight selectable gain settings, eliminating the need for precision feedback resistors and reducing board area. The amplifier delivers an 18 MHz -3dB bandwidth and a 22 V/µs slew rate, making it suitable for multiplexed analog inputs, data acquisition front-ends, and sensor signal conditioning where gain must be adjusted dynamically or set per channel. Input bias current is 1 pA typical, which minimizes offset errors when driving high-impedance sensors such as photodiodes or pH probes.

Supply current and output drive

Quiescent supply current is 1 mA typical, which keeps the thermal budget low in densely populated boards. Each channel can source or sink 25 mA, enough to drive a 2 kΩ load to within 100 mV of the rails or to charge a small sampling capacitor in a downstream ADC. Input offset voltage is 400 µV maximum, a figure that matters when the PGA is set to high gain because the offset is multiplied by the gain setting.

For a design that relies on programmable gain in a single 8-SOIC footprint, this part is a stable BOM line without forced-migration risk.

Frequently asked questions

Is the MCP6S91T-E/SN rail-to-rail output?

Yes, the output stage is rail-to-rail. The input common-mode range is not rail-to-rail, so the input signal must stay within the supply rails. The output can swing to within a few millivolts of both VSS and VDD under light loads.

What is the bandwidth of MCP6S91T-E/SN?

The -3dB bandwidth is 18 MHz. This is the small-signal bandwidth at unity gain. At higher gain settings the bandwidth scales down inversely with the gain, per the gain-bandwidth product of the amplifier.

What is an equivalent for MCP6S91T-E/SN?

The closest functional equivalent in the same package is the MCP6V91UT-E/OT, a zero-drift PGA with 10 MHz bandwidth and 9.5 V/µs slew rate. It trades some speed for lower input offset (9 µV typical) and is offered in a smaller SOT-23-5 package. For a general-purpose fixed-gain alternative, the MCP6291T-E/MS provides 10 MHz bandwidth and 7 V/µs slew rate in an MSOP-8, but lacks the programmable gain feature.