Product Overview
National Semiconductor LM555CN Single Timer IC in an 8-Pin Plastic DIP, 200mA Drive, New Unused Stock
Condition
New, unused, and sold here as a National Semiconductor part. The piece photographed is a black plastic 8-pin DIP with bright, straight, untrimmed leads and no solder anywhere on the pins. Shot close up, the topside marking reads LM555CN below an M56AJ lot line, with National Semiconductor's stylized script N logo at the head of that line, the molded pin 1 dimple in the lower left corner, and a lighter matte band running down the left edge of the case. Stock is loose individual pieces rather than a factory tube or rail, so what you are buying is the parts and not the packaging.
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Product Overview
The National Semiconductor LM555CN is a single timer in the classic 8-pin plastic DIP, the through-hole package that made the 555 the default answer for monostable one-shot and astable oscillator timing on a board. It runs from a single supply of 4.5 V to 16 V, carries a high current drive capability of 200 mA, allows an adjustable duty cycle, and holds temperature stability of 0.005 percent per degree C. The piece photographed is marked LM555CN beneath an M56AJ lot line headed by National's script N, so the number a technician is matching sits right on top of the case. Values beyond the ones listed here are not confirmed by us; check the manufacturer datasheet before you commit a design.
Key Features
- Manufacturer: National Semiconductor
- Function: single timer, monostable and astable operation
- Supply: single rail, 4.5 V to 16 V
- Output: high current drive capability, 200 mA
- Duty cycle: adjustable
- Temperature stability: 0.005 percent per degree C
- Package: 8-pin plastic DIP, through hole
- Marking on the photographed part: National script N logo heading an M56AJ lot line, LM555CN below
- Condition: new and unused, leads straight, bright, and untrimmed
Applications
- Hobbyist breadboarding a blinker or tone generator who wants the original through-hole part instead of an SMD adapter board
- Repair technician replacing a dead timer in a 1980s control board that expects a DIP-8 socket
- Instructor stocking a teaching lab where every bench needs its own 555 for the timing exercise
- Product engineer prototyping a one-shot pulse stretcher before committing to a surface-mount layout
Frequently Asked Questions
What supply voltage does this timer need?
A single rail from 4.5 V to 16 V, which is why it drops onto the same 5 V or 12 V supply as the rest of a small board without extra regulation. Anything outside that window is not confirmed here; verify against the datasheet before use.
How much current can the output drive?
The listed figure is a high current drive capability of 200 mA, which in many designs covers a small relay coil, an LED string, or a piezo without adding a buffer stage. Confirm the number against the datasheet for your specific load and supply.
How steady is the timing when the board warms up?
Temperature stability is stated at 0.005 percent per degree C. For blinker, delay, and audio tone work that drift is invisible. For precision instrumentation timing, check the figure against the datasheet across your actual temperature range.
This is sold as National Semiconductor. What does the case actually say?
The topside marking photographed reads LM555CN beneath an M56AJ lot line headed by National Semiconductor's stylized script N logo, so the maker's mark and the part number both sit on the case. That LM555CN number is what a technician matches to a datasheet, a socket, or a BOM line. Those markings are what the photographed piece carries; stock is loose singles that we have not inspected one by one, so the lot line on the piece you receive may read differently.
I only need three of these. Do I have to buy a bag of 100?
No. These sit several dozen deep on the shelf and sell by the piece, so you take the three a repair needs or the five a class kit needs instead of a forced lot of 10, 50, or 100 that lives out its days in a drawer. Shipping is $8 flat rate and free once the order passes $28, and orders leave our Idaho warehouse the same or next business day.
Plenty of chips get designed out and forgotten; the 555 keeps getting designed back in, one blinker and one nervous one-shot at a time. Take the handful your build needs and let this National Semiconductor timer start counting.
