Product Overview
Precision CMOS Op Amp That Sips 20 Microamps: National Semiconductor LMC6061AIM in 8-Lead SOIC
Condition
New, unused stock. The photographs show the actual part: a black 8-lead small outline package carrying the National Semiconductor stylized N logo, the lot code 56AB on the first line, and LMC6061AIM printed across the two lines below it, with the molded pin 1 dot beside the marking. The gull-wing leads are straight, evenly formed, and bright, with no solder, no tinning residue, and no oxidation. Parts are photographed loose, one against a hand and one on clear packing film, so you can see both the markings and the true size of the package. No ruler appears in either photo, so no dimensions are stated here.
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Product Overview
The LMC6061 is National Semiconductor's precision CMOS single micropower operational amplifier, and this is the AIM version: the A grade in the 8-lead surface mount SOIC body shown in the photographs. It pairs a 100 µV offset voltage and 140 dB of voltage gain with a 20 µA supply current, so the precision does not cost you the battery. Input bias current is specified at 10 fA, which is what makes it usable straight off a photodiode, an electrometer node, or a high value divider. It runs from a single supply of 4.5V to 15V, the input common-mode range includes the negative rail (V-), and the output swings within 10 mV of the supply rail into a 100k load. Searched and cross-referenced as LMC6061AIM, LMC6061, and the 6061 micropower op amp.
Key Features
- Low offset voltage: 100 µV
- Ultra low supply current: 20 µA
- Single supply operation: 4.5V to 15V
- Ultra low input bias current: 10 fA
- Output swing within 10 mV of the supply rail with a 100k load
- Input common-mode range includes the negative supply rail (V-)
- High voltage gain: 140 dB
- Package: 8-lead SOIC surface mount, top marked LMC6061AIM with lot code 56AB
Applications
- Instrumentation designer building a battery powered bridge or strain gauge front end where the whole analog section has a microamp budget
- Sensor engineer buffering a photodiode or pH electrode, where 10 fA of input bias current keeps the source from being loaded down
- Repair technician replacing a failed single op amp on a board that calls out an LMC6061 in the 8-lead SOIC footprint
- Data logger builder who needs a single supply amplifier that still reads accurately down at the negative rail
Frequently Asked Questions
What exactly is printed on the top of the chip?
Three lines, all legible in the photographs: the National Semiconductor N logo followed by 56AB, then LMC60, then 61AIM. Read together, the part number is LMC6061AIM. 56AB is a factory lot marking; we do not decode it into a manufacturing date, so treat it as a lot reference only.
Will it work on a single 5V rail?
Yes. The part is rated for single supply operation from 4.5V to 15V, and the input common-mode range includes the negative rail, so a ground referenced sensor sits inside the usable input window. The output gets within 10 mV of the rail with a 100k load; heavier loads pull that number back, and those load dependent limits are not confirmed here, so verify against the National Semiconductor datasheet before use.
Why choose this over a cheaper general purpose op amp?
Two numbers: 10 fA of input bias current and 20 µA of supply current. A common bipolar op amp draws bias current that a megohm scale source cannot supply without introducing error, and it burns milliamps doing it. This is the part for high impedance sources on a power budget. Grade specific limits over temperature are not confirmed here - check the datasheet for your operating range.
Why buy two or three of these here instead of a full reel or a bag of 100?
A repair takes one. A prototype run takes three, maybe five with spares. Most sources for the LMC6061AIM want to move a strip or a reel, so you end up storing 95 op amps to fix one board. Order the exact count your build needs, from stock, with the photographs above showing the marking you will actually receive. 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 is a current a coin cell barely notices, and ten femtoamps of input bias means the sensor never really knows the amplifier is listening. If your circuit has to sit quiet and accurate for a very long time, this little eight-pin from National is built for that kind of patience.
