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
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
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.
Related Guides
TPS54160DGQR Selection Guide: How to Choose a 60V Step-Down Buck Converter
Complete selection guide for the TPS54160DGQR 60V/1.5A step-down converter. Compare specs, alternatives, and sourcing options for industrial and automotive designs.
May 20, 2026
LMV932MM Dual Low-Voltage CMOS Op-Amp: Application Design Guide
Complete application design guide for the LMV932MM dual rail-to-rail CMOS op-amp: supply decoupling, RRIO design rules, stability, and recommended circuits for 1.8V–5.5V battery-powered systems.
May 20, 2026
TL084CN Equivalent and Replacements: JFET-Input Quad Op-Amp Comparison Guide
Compare TL084CN with TL074, LF347, and LM324 quad op-amps. Pin-compatible equivalents, key specs, and when to choose each for your analog design.
May 20, 2026
TPS386000RGPR Quad Voltage Supervisor: Selection and Sourcing Guide (2025)
Compare TPS386000RGPR with TPS386040RGPR, TPS3700, and TPS3823 voltage supervisors. Key specs, threshold programming, watchdog options, and sourcing tips.
May 20, 2026
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.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”