Product Overview
TI SN74121 One-Shot Pulse Generator IC 14-Pin DIP
Condition
Used equipment pull. Evaluation: Visual inspection only. Function testing not performed. Markings legible on top face: Texas Instruments logo, 69CKL3K, SN74121N. Through-hole pins intact. Sourced as a single component pull.
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Product Overview
The Texas Instruments SN74121N is a classic standard TTL monostable multivibrator housed in a 14-pin dual in-line package (DIP-14). Designed for precision pulse generation, it features dual negative-edge-triggered inputs alongside a positive Schmitt-trigger input for noise-tolerant signal gating. Pulse duration can be configured using internal timing components or adjusted across a wide range with external timing resistors and capacitors. It operates on a nominal 5V DC supply, making it an essential building block for legacy computing, vintage synth servicing, arcade PCB repairs, and TTL timing circuits.
Key Features
- Standard 7400-series TTL logic family architecture
- Dual negative-edge-triggered inputs and one positive Schmitt-trigger input
- Jitter-free pulse generation with programmable pulse width
- Nominal 5.0V DC operating voltage
- 0°C to 70°C commercial operating temperature rating
- Through-hole 14-pin plastic DIP (N suffix) package
Applications
- Replacing failed pulse generators during arcade PCB and vintage computer logic repairs.
- Generating clean clock pulses and debouncing mechanical switches on digital hobbyist breadboards.
- Restoring analog synthesizers and timing control boards that rely on standard TTL multivibrator ICs.
- Prototyping edge-triggered timing sub-circuits for custom maker electronics.
Frequently Asked Questions
What logic voltage does the SN74121N require?
It operates on a standard 5V TTL supply (recommended operating range 4.75V to 5.25V DC).
Can the pulse width be adjusted externally?
Yes. The output pulse width can be controlled using external timing resistors and capacitors connected to the dedicated timing pins, or by utilizing the internal timing resistor.
Why buy this individually tested-marking pull instead of a large surplus lot?
When restoring vintage hardware or finishing a specific bench repair, buying a single identified piece gives you the exact component you need without paying for a bulk tray of parts you will never use. Orders ship for an $8 flat rate, qualify for free shipping at $28 or more, and leave our Idaho warehouse the same or next business day.
Vintage TTL logic never really goes out of style when there is an authentic board on your bench waiting for its clock pulses to align. Plug it in, solder it down, and watch the circuit come back to life.
