Product Overview
National Semiconductor LMC6041AIM: a 20 µA CMOS Op Amp in an 8-Lead Surface Mount Package
Condition
New, unused stock. The photographs show the top of the package marked with the National Semiconductor logo, the lot code 56AJ, and the part number LMC6041AIM broken across two lines. All eight gull-wing leads are bright, straight, and evenly formed on both rows, with no solder, flux residue, or tinning bridges that would point to a previous board mounting. The molded pin 1 dot is crisp at the lower left of the marked face. The reverse side carries a round silvered mold mark at the center of the body, a molding artifact from manufacture rather than damage or rework. Parts are photographed loose, on clear packing film, not on tape and reel. Multiple pieces are in stock, so you order the count you need.
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Product Overview
The LMC6041AIM is a single micropower CMOS operational amplifier from National Semiconductor, built for circuits that have to run on almost nothing and still measure something real. Published specifications for this device put supply current at 20 µA, input offset voltage at 100 µV, and input bias current at 10 fA, with an output that swings to within 10 mV of the supply rail into a 100k load and a voltage gain of 140 dB. It operates from a single supply of 4.5V to 15V, and its input common-mode range includes the negative supply rail, which is what lets it work as a ground-sensing single-rail amplifier without a split supply. The M suffix denotes the 8-lead small outline surface mount body, and that is exactly what the photos show: a black molded SOIC package roughly the size of a fingernail, laser-marked LMC6041AIM with the 56AJ lot code above it.
Key Features
- Manufacturer: National Semiconductor
- Part number as marked on the package: LMC6041AIM
- Function: single micropower CMOS operational amplifier
- Supply current: 20 µA
- Input offset voltage: 100 µV
- Input bias current: 10 fA
- Single supply operation: 4.5V to 15V
- Output swing: within 10 mV of the supply rail with a 100k load
- Input common-mode range includes the negative supply rail
- Voltage gain: 140 dB
- Package: 8-lead surface mount (SOIC), gull-wing leads, molded pin 1 dot
- Lot code printed on the part: 56AJ
- Condition: new, unused, sold as loose pieces
Applications
- Instrumentation designer buffering a pH or ion-selective electrode, where a 10 fA input bias current keeps a gigaohm-class source from being dragged off its own reading
- Product engineer building a battery-powered data logger whose entire analog front end has to live inside a microamp budget between wake-ups
- Lab technician putting together a photodiode or electrometer stage on a single 5V rail, using the ground-sensing input range instead of adding a negative supply
- Repair tech replacing a failed micropower amplifier in older National Semiconductor based portable instrumentation and wanting the original part number, not a substitute
Frequently Asked Questions
What package is this, and is it through-hole?
It is surface mount. The photos show the 8-lead small outline body with gull-wing leads that the M suffix calls for, so it lands on pads, not in a DIP socket. If your board was laid out for a DIP-8 amplifier, this piece will need an adapter.
What does the 56AJ marking above the part number mean?
That is the manufacturer's lot and trace code, printed on the package in the row above LMC6041AIM. We report what is physically on the part and do not decode it into a manufacturing date. Not confirmed as a date code - treat it as trace information only.
Will it work on a single 5V supply?
Yes, based on the published range. This device is specified for single supply operation from 4.5V to 15V, and its input common-mode range includes the negative rail, so a 5V single-rail design with signals sitting near ground is within what the part was designed to do.
Are these tested, and what should I check before designing them in?
These are new, unused parts rather than board pulls: the leads are unsoldered and the packages carry clean factory marking, as the photos show. The specifications quoted here come from the manufacturer's published data for this device, so check the National Semiconductor datasheet against your own design before you commit to a layout.
Anything special about handling a 10 fA input?
Yes. At femtoamp bias currents, the amplifier is rarely the limiting factor - the board is. Flux residue, fingerprints, and humidity across the input pads can leak far more current than the part itself, so clean the board well and consider a guard ring around the summing node. Standard CMOS ESD precautions apply at the bench.
Why buy two or three of these instead of a full reel of surface mount amplifiers?
Because a micropower front end usually needs one or two op amps, not two hundred and fifty. We keep these in multiples and sell the exact count you want, loose, with no forced lot and no reel to cut into for a single prototype channel plus a spare. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Twenty microamps of supply current and ten femtoamps of input bias: this is an amplifier built to sip rather than drink, and to listen to sources so quiet that touching the board is louder than the signal. Give it a clean layout and a single battery rail, and it will keep doing its patient arithmetic long after you have forgotten it is there.
