Product Overview
Texas Instruments SN74LS123N Monostable Multivibrator, 16-Pin Plastic DIP, Single Used Piece
Condition
Used. The photographed piece is a black plastic 16-pin DIP marked MALAYSIA 436AS on the top line, with the Texas Instruments logo and SN74LS123N on the second line. The printing is crisp and fully legible. Leads are bright, straight and free of solder residue or flux, which is what a socket-pulled logic chip looks like in a warehouse: no board work was done to it. There is one piece in stock and it is sold untested, so the photo is the spec for what ships. It is shown on pink anti-static foam next to the PartsMine millimeter ruler.
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Product Overview
The SN74LS123N is a monostable multivibrator, better known on the bench as a one-shot: it sits idle until a trigger arrives, then puts out a single output pulse of a set duration before returning to its resting state. The 74x123 family is the dual retriggerable version of that function, and the pulse width is set outside the chip by a resistor and capacitor you choose for the job. The LS suffix places it in the low-power Schottky TTL family, the workhorse logic generation behind an enormous amount of 1970s through 1990s control, instrument and computer hardware. This one carries the Texas Instruments logo and MALAYSIA 436AS marking cast into the plastic top, in the 16-pin through-hole DIP package that drops straight into a socket or a legacy board footprint. Exact timing coefficients, supply limits and trigger thresholds are not confirmed here - verify against the TI datasheet before use.
Key Features
- Part number: SN74LS123N, marked on the package
- Manufacturer: Texas Instruments, identified by the logo on the body
- Function: monostable multivibrator, the dual retriggerable one-shot of the 74x123 family
- Logic family: 74LS low-power Schottky TTL
- Package: 16-pin plastic DIP, through-hole
- Pulse width: set by external resistor and capacitor, chosen by the designer
- Body markings: MALAYSIA 436AS above the TI logo and part number
- Condition: Used, leads straight and clean, sold untested
- Quantity available: one piece
Applications
- Repair technician restoring a 1980s instrument that dropped a one-shot out of its timing chain and needs the original part in the original socket
- Arcade or vintage computer restorer chasing a dead pulse-stretcher on a board that expects a 74LS123 footprint
- Lab or hobby builder breadboarding a debounce, delay or pulse-width stage and picking the resistor and capacitor to suit
- Maintenance engineer stocking one spare TTL one-shot for a control panel nobody makes boards for anymore
Frequently Asked Questions
What exactly is printed on this chip?
Two lines. The top line reads MALAYSIA 436AS. The second line carries the Texas Instruments logo followed by SN74LS123N. Both lines are legible in the product photo.
Has it been tested?
No. It is listed and sold untested. What we can show you is the package, the markings and the leads, all photographed as the piece sits.
Why do the pins look clean if it is listed as Used?
A logic IC that lived in a socket comes out looking like this - bright leads, no solder, no flux. Clean pins on a used DIP are normal, not a contradiction.
How is the output pulse length set?
By an external resistor and capacitor connected to the timing pins, not by anything inside the chip. Pick the values for your pulse from the TI datasheet timing tables.
What am I actually getting, and what am I taking on?
You are getting the single used SN74LS123N in these photos: a 16-pin Texas Instruments DIP with legible markings and straight, clean, solder-free leads, sold as-is and untested. The risk you absorb is the electrical function, since we do not put it on a tester - the photos are the spec for the physical piece, and the datasheet is your reference for the rest. For a bench repair where the alternative is an unknown chip out of a mixed bag, a photographed single piece with readable markings is usually the shorter path. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
A one-shot spends its whole life waiting, then decides exactly how long the moment lasts. Pick the resistor and capacitor that suit your pulse, and this Malaysia-marked Texas Instruments part goes back to timing somebody else's circuit.
