74HC123D

@@ -0,0 +1,57 @@+# 74HC123D++**Nexperia** · Monostable Multivibrators · SOIC-16++74HC123D from Nexperia, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1A | input | Negative-edge triggered input for monostable 1 (Schmitt-trigger input). A HIGH-to-LOW transition on 1A triggers a pulse when 1B is HIGH and 1RD is HIGH. |+| 2 | 1B | input | Positive-edge triggered input for monostable 1 (Schmitt-trigger input). A LOW-to-HIGH transition on 1B triggers a pulse when 1A is LOW and 1RD is HIGH. |+| 3 | 1RD | input | Direct reset (active LOW) and positive-edge triggered input for monostable 1. Driving LOW terminates the output pulse; a LOW-to-HIGH transition can also trigger a pulse. |+| 4 | 1Q | output | Active LOW inverted output of monostable 1. Complement of 1Q; goes HIGH during the timed output pulse. |+| 5 | 2Q | output | Active HIGH output of monostable 2. Goes HIGH for the programmed pulse width when triggered. |+| 6 | 2CEXT | passive | External timing capacitor connection for monostable 2. Connect CEXT between this pin and 2REXT/CEXT (pin 7); pulse width = K x REXT x CEXT. |+| 7 | 2REXT/CEXT | passive | External timing resistor and capacitor connection for monostable 2. REXT ties from this pin to VCC (2 kOhm to 1000 kOhm typical); CEXT ties from this pin to 2CEXT (pin 6). |+| 8 | GND | power_in | Ground reference (0 V). |+| 9 | 2A | input | Negative-edge triggered input for monostable 2 (Schmitt-trigger input). A HIGH-to-LOW transition on 2A triggers a pulse when 2B is HIGH and 2RD is HIGH. |+| 10 | 2B | input | Positive-edge triggered input for monostable 2 (Schmitt-trigger input). A LOW-to-HIGH transition on 2B triggers a pulse when 2A is LOW and 2RD is HIGH. |+| 11 | 2RD | input | Direct reset (active LOW) and positive-edge triggered input for monostable 2. Driving LOW terminates the output pulse; a LOW-to-HIGH transition can also trigger a pulse. |+| 12 | 2Q | output | Active LOW inverted output of monostable 2. Complement of 2Q; goes HIGH during the timed output pulse. |+| 13 | 1Q | output | Active HIGH output of monostable 1. Goes HIGH for the programmed pulse width when triggered. |+| 14 | 1CEXT | passive | External timing capacitor connection for monostable 1. Connect CEXT between this pin and 1REXT/CEXT (pin 15); pulse width = K x REXT x CEXT. |+| 15 | 1REXT/CEXT | passive | External timing resistor and capacitor connection for monostable 1. REXT ties from this pin to VCC (2 kOhm to 1000 kOhm typical); CEXT ties from this pin to 1CEXT (pin 14). |+| 16 | VCC | power_in | Supply voltage. 2.0 V to 6.0 V (74HC123) or 4.5 V to 5.5 V (74HCT123). Absolute maximum 7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++- `74HC123DD`+- `74HC123DPW`+- `74HC123DBQ`++## CAD (KiCad official)++- Symbol: `74HC123D`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74HC123D.pdf) (20 pp, sha256 `0b5ba7a32cf4830a`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/74hc123d-datasheet.pdf)

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