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Texas Instruments LMH6645MFX — Analog & Data Acquisition

LMH6645MFX Op-Amp, 55 MHz, 22 V/µs, Rail-to-Rail, SOT-23-5

MPNLMH6645MFX
End of Life

Texas Instruments LMH6645MFX, LMH® series, voltage-feedback op-amp, single circuit, 55 MHz gain bandwidth, 22 V/µs slew rate, rail-to-rail output, 2.5 V to 12 V supply, SOT-23-5 package, -40°C to 85°C.

$0.92Ref. price · indicative, final on quote
Texas Instruments LMH6645MFX datasheet (PDF)
PackagingSC-74A, SOT-753
RoHSRoHS non-compliant
SeriesLMH®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LMH6645MFX specifications
ParameterValue
SeriesLMH®
Output typePush-Pull, Rail-to-Rail
MountingSurface Mount
Amplifier typeVoltage Feedback
Voltage - input offset1 mV
Voltage - supply span2.5 V
Current - supply725µA
Current - input bias650 nA
Current - output (Channel)20 mA
Operating temperature-40°C ~ 85°C
-3db bandwidth55 MHz
Gain bandwidth product55 MHz
PackageBulk
Slew rate22V/µs
CaseSC-74A, SOT-753
Number of circuits1

Product details

It delivers a rail-to-rail push-pull output stage, so it can swing close to both supply rails without an external pull-up — useful when you are driving an ADC input or a cable directly. The supply span runs from 2.5 V up to 12 V, which covers the common 5 V and 3.3 V single-rail designs you see in portable instrumentation and sensor front-ends. Quiescent current sits at 725 µA, a reasonable trade-off for the bandwidth it offers; you are not burning battery charge just to get 55 MHz of small-signal bandwidth.

The SOT-23-5 footprint (SC-74A) is a compact surface-mount package that fits into tight layouts — think two-layer sensor boards or handheld tools where every square millimetre counts.

For RoHS-compliant builds, check the lead-free suffix variants in the LMH6645 family.

Frequently asked questions

Can LMH6645MFX be used in single-supply 5 V applications?

Yes. The supply voltage range is 2.5 V to 12 V, so a single 5 V rail is well within the operating window. The rail-to-rail output stage lets the signal swing close to both rails without external biasing.

What are the best alternatives or equivalents for LMH6645MFX?

A close functional peer is the TLV9351IDCKR from TI — a single-channel, rail-to-rail general-purpose op-amp with a 3.5 MHz bandwidth and 20 V/µs slew rate, in the same SOT-23-5 footprint. If you need the full 55 MHz bandwidth, the LMH6645MFX remains the direct fit; the TLV9351 is a lower-speed, lower-power alternative for less demanding signal paths.