component
SN74LS123DBR
Public Made by Adomby adom
Texas Instruments Monostable Multivibrators, SSOP-16-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownSN74LS123DBR
Texas Instruments · Monostable Multivibrators · SSOP-16-208mil
SN74LS123DBR 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 | Multivibrator 1 trigger input A, triggered on its falling edge (high-to-low transition) while 1B is high and 1CLR is high. |
| 2 | 1B | input | Multivibrator 1 trigger input B, triggered on its rising edge while 1A is low and 1CLR is high, with Schmitt hysteresis for slow transitions down to 0.1 mV/ns. |
| 3 | 1CLR | input | Multivibrator 1 active-low clear input that terminates the output pulse when taken low, with a 17 kΩ nominal input resistance. |
| 4 | ~{1Q} | output | Multivibrator 1 complementary (active-low) pulse output, rated for IOL up to 8 mA and IOH of -400 µA for the SN74LS123. |
| 5 | 2Q | output | Multivibrator 2 true pulse output, rated for IOL up to 8 mA and IOH of -400 µA for the SN74LS123. |
| 6 | 2Cext | passive | Multivibrator 2 external timing capacitor terminal (negative side), where Cext has no restriction on value. |
| 7 | 2Rext/Cext | passive | Multivibrator 2 external timing resistor/capacitor junction, with Rext from 5 kΩ to 260 kΩ to VCC for the SN74LS123 and wiring capacitance limited to 50 pF max. |
| 8 | GND | power_in | Ground; all voltage values in the datasheet are referenced to this network ground terminal. |
| 9 | 2A | input | Multivibrator 2 trigger input A, triggered on its falling edge (high-to-low transition) while 2B is high and 2CLR is high. |
| 10 | 2B | input | Multivibrator 2 trigger input B, triggered on its rising edge while 2A is low and 2CLR is high, with Schmitt hysteresis for slow transitions down to 0.1 mV/ns. |
| 11 | 2CLR | input | Multivibrator 2 active-low clear input that terminates the output pulse when taken low, with a 17 kΩ nominal input resistance. |
| 12 | ~{2Q} | output | Multivibrator 2 complementary (active-low) pulse output, rated for IOL up to 8 mA and IOH of -400 µA for the SN74LS123. |
| 13 | 1Q | output | Multivibrator 1 true pulse output, rated for IOL up to 8 mA and IOH of -400 µA for the SN74LS123. |
| 14 | 1Cext | passive | Multivibrator 1 external timing capacitor terminal (negative side), where Cext has no restriction on value. |
| 15 | 1Rext/Cext | passive | Multivibrator 1 external timing resistor/capacitor junction, with Rext from 5 kΩ to 260 kΩ to VCC for the SN74LS123 and wiring capacitance limited to 50 pF max. |
| 16 | VCC | power_in | Supply voltage, recommended 4.75 V to 5.25 V for the SN74LS123 with an absolute maximum of 7 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-208mil |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74LS123DBR - Footprint:
Package_SO:SSOP-16_5.3x6.2mm_P0.65mm - 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
- 3D model files:
sn74ls123dbr-etched.step/sn74ls123dbr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ls123dbr.step/sn74ls123dbr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (32 pp, sha256
24c30d3b1087b33e, retrieved 2026-11-05, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).