SN74LS221N Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
SN74LS221N is a dual monostable multivibrator with Schmitt-trigger inputs from Texas Instruments in the LS TTL logic family. Features two independent one-shot sections with 15pF load capacitance and complementary outputs in a 16-pin PDIP package. RoHS compliant and available worldwide for timing and pulse generation applications.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74LS221N Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.7750(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS221N?
- Dual monostable multivibrator with Schmitt-trigger inputs for high noise immunity and clean pulse generation from slow or noisy input signals
- Two independent one-shot sections with complementary Q and Q-bar outputs for flexible pulse-width timing and signal conditioning
- LS TTL logic family with 5V operation and 8mA output sink current ensuring broad compatibility with legacy digital systems
- Lead-free JESD-609 e4 compliant in 16-pin PDIP (R-PDIP-T16) package suitable for through-hole prototyping and industrial designs
What is SN74LS221N used for?
The SN74LS221N is used in pulse-width generation, signal debouncing, and one-shot timing circuits in industrial control systems, laboratory instruments, and TTL-based digital logic designs. The Schmitt-trigger inputs make it particularly effective for conditioning slow or noisy signals from mechanical switches, sensors, and external interfaces before processing in digital systems.
What are the specifications of SN74LS221N?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Family | LS |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Logic IC Type | MONOSTABLE MULTIVIBRATOR |
| Max I(ol) | 0.008A |
| Number of Bits | 2 |
| Number of Data/Clock Inputs | 2 |
| Number of Functions | 2 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 27mA |
| Propagation Delay (tpd) | 80ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | YES |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia, Mexico |
Where can I find the SN74LS221N datasheet?
SN74LS221N Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS221N?
Compatible alternatives and drop-in replacements for SN74LS221N:
Frequently Asked Questions
What is the SN74LS221N and what does it do?
The SN74LS221N is a dual monostable multivibrator (one-shot) with Schmitt-trigger inputs. It generates a fixed-width output pulse each time it is triggered, with the pulse width determined by an external resistor-capacitor network connected to the Rx and Cx pins.
What are the Schmitt-trigger inputs on the SN74LS221N used for?
The Schmitt-trigger inputs provide hysteresis in the switching threshold, allowing the SN74LS221N to accept slow-rising, noisy, or degraded input signals and produce clean, well-defined output pulses, which is especially useful when interfacing with mechanical switches or sensors.
What logic family does the SN74LS221N belong to?
The SN74LS221N belongs to the LS (Low-power Schottky) TTL logic family, operating at a standard 5V supply voltage with typical propagation delays and power consumption characteristic of LS-TTL, making it directly compatible with other 7400-series TTL devices.
What package does the SN74LS221N come in?
The SN74LS221N is packaged in a 16-pin PDIP (Plastic Dual In-Line Package, JESD-30 code R-PDIP-T16), a through-hole package that is convenient for breadboard prototyping, socketed industrial installations, and PCB designs using through-hole assembly.
Can the SN74LS221N be used for switch debouncing?
Yes, the SN74LS221N is well suited for switch debouncing. Its Schmitt-trigger inputs reject the noisy transitions from mechanical switch bounce, and the one-shot output provides a single clean pulse of controlled duration, preventing multiple false trigger events in downstream logic circuits.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.5500 | $1.55 |
| 11+ | $1.5000 | $16.50 |
| 17+ | $0.9300 | $15.81 |
| 66+ | $0.7750 | $51.15 |
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