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SN74LS221DBR

Public Made by Adom

by adom

Texas Instruments Monostable Multivibrators, SSOP-16-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LS221DBR

Texas Instruments · Monostable Multivibrators · SSOP-16-208mil

SN74LS221DBR from Texas Instruments, in a SSOP-16-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1A input Monostable 1 negative-transition-triggered input, which can also be used as an inhibit input; unused inputs must be held at VCC or GND.
2 1B input Monostable 1 positive-transition-triggered Schmitt-trigger input, which can also be used as an inhibit input.
3 1CLR input Monostable 1 active-low overriding clear input that terminates the output pulse.
4 1Q̄ output Monostable 1 complementary (inverted) totem-pole output, high when idle; IOL 8 mA max and IOH -400 µA for the SN74LS221.
5 2Q output Monostable 2 totem-pole output, low when idle and high during the pulse; IOL 8 mA max and IOH -400 µA for the SN74LS221.
6 2Cext passive Monostable 2 external timing capacitor connection; the Rext/Cext terminal is never more positive than this terminal.
7 2Rext/Cext passive Monostable 2 external timing resistor/capacitor junction; Rext 1.4 kΩ min to 100 kΩ max for the SN74LS221, with tw ≈ 0.7·Cext·Rext.
8 GND power_in Ground.
9 2A input Monostable 2 negative-transition-triggered input, which can also be used as an inhibit input.
10 2B input Monostable 2 positive-transition-triggered Schmitt-trigger input, which can also be used as an inhibit input.
11 2CLR input Monostable 2 active-low overriding clear input that terminates the output pulse.
12 2Q̄ output Monostable 2 complementary (inverted) totem-pole output, high when idle; IOL 8 mA max and IOH -400 µA for the SN74LS221.
13 1Q output Monostable 1 totem-pole output, low when idle and high during the pulse; IOL 8 mA max and IOH -400 µA for the SN74LS221.
14 1Cext passive Monostable 1 external timing capacitor connection; the Rext/Cext terminal is never more positive than this terminal.
15 1Rext/Cext passive Monostable 1 external timing resistor/capacitor junction; Rext 1.4 kΩ min to 100 kΩ max for the SN74LS221, with tw ≈ 0.7·Cext·Rext.
16 VCC power_in Supply voltage, 4.75 V to 5.25 V recommended for the SN74LS221 (7 V absolute maximum).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SSOP-16-208mil
Category Logic ICs
Pins 16

CAD (KiCad official)

  • Symbol: SN74LS221DBR
  • Footprint: Package_SO:SSOP-16_5.3x6.2mm_P0.65mm
  • 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
  • 3D model files: sn74ls221dbr-etched.step / sn74ls221dbr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls221dbr.step / sn74ls221dbr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (31 pp, sha256 9d7f372b30430c70, retrieved 2026-10-08, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF