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Texas Instruments LMP8640MKX-F/NOPB — Logic ICs

LMP8640MKX-F/NOPB Current Sense Amplifier, 450 kHz, SOT-23-6

MPNLMP8640MKX-F/NOPB
End of Life

Texas Instruments LMP8640MKX-F/NOPB, Current Sense Amplifier, 1 Circuit, 450 kHz GBW, 1.8 V/µs Slew Rate, 2.7 V to 12 V Supply, SOT-23-6, -40°C to 125°C.

$2.7Ref. price · indicative, final on quote
PackagingSOT-23-6 Thin, TSOT-23-6
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

LMP8640MKX-F/NOPB Technical Specifications
ParameterValue
Mounting typeSurface Mount
Amplifier typeCurrent Sense
Voltage - input offset900 µV
Voltage - supply span2.7 V
Current - supply2.3mA
Current - input bias13 µA
Operating temperature-40°C ~ 125°C
Gain bandwidth product450 kHz
PackageTape & Reel (TR); Cut Tape (CT)
Slew rate1.8V/µs
CaseSOT-23-6 Thin, TSOT-23-6
Number of circuits1

Product details

450 kHz gain-bandwidth — what it buys the current-sense node

Its 450 kHz gain-bandwidth product and 1.8 V/µs slew rate let it track DC load current and low-frequency ripple in power supplies and motor drives, but it won't resolve fast switching edges — the bandwidth is sized for average and peak current monitoring, not high-speed overcurrent detection.

Quiescent supply current is 2.3 mA typical. That's modest for a precision current sense amp — it won't strain a 3.3 V linear regulator in a 24 V/7 industrial PSU, but it's too high for a battery-powered sensor node running on a coin cell. The input bias current of 13 µA is higher than a zero-drift alternative; factor that into the shunt resistor value if you're measuring microamp-level loads. Input offset voltage is 900 µV, which at a 50 mV full-scale shunt drop gives about 1.8% error — acceptable for load monitoring but not for a billing-grade meter.

SOT-23-6 Thin — footprint and rework

The thin profile helps in tight enclosures, but the small pad geometry means the usual hot-air rework profile for a standard SOT-23-6 works fine — just watch the ramp rate to avoid tombstoning. Mounting is surface mount only.

Frequently asked questions

When sourcing LMP8640MKX-F/NOPB, what's the closest functional second-source?

Its gain-bandwidth is 350 kHz versus 450 kHz, and it draws 1.8 mA supply current versus 2.3 mA. The package differs — the INA254A1IPWAR comes in a different footprint — so the board layout would need a spin. No pin-compatible drop-in exists.