74HC4538PW-Q100118

@@ -0,0 +1,58 @@+# 74HC4538PW-Q100118++**Nexperia** · Monostable Multivibrators · TSSOP-16++74HC4538PW-Q100118 from Nexperia, in a TSSOP-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 | 1CEXT | passive | Multivibrator 1 external capacitor connection. Always connected to ground side of CEXT. |+| 2 | 1REXT/CEXT | passive | Multivibrator 1 external resistor / capacitor connection. REXT ties to VCC; CEXT ties between this pin and 1CEXT. Pulse width TW = 0.7 x REXT x CEXT. |+| 3 | 1nCD | input | Multivibrator 1 direct reset input, active LOW. A LOW level terminates the output pulse immediately. |+| 4 | 1B | input | Multivibrator 1 trigger input B (positive-going / LOW-to-HIGH edge triggered). Schmitt-trigger input. |+| 5 | 1nA | input | Multivibrator 1 trigger input A (negative-going / HIGH-to-LOW edge triggered). Schmitt-trigger input. |+| 6 | 1Q | output | Multivibrator 1 non-inverting output; produces a HIGH pulse of width TW when triggered. |+| 7 | 1nQ | output | Multivibrator 1 complementary (inverting, active-LOW) output; produces a LOW pulse of width TW when triggered. |+| 8 | GND | power_in | Ground reference, 0 V. |+| 9 | 2nQ | output | Multivibrator 2 complementary (inverting, active-LOW) output; produces a LOW pulse of width TW when triggered. |+| 10 | 2Q | output | Multivibrator 2 non-inverting output; produces a HIGH pulse of width TW when triggered. |+| 11 | 2nA | input | Multivibrator 2 trigger input A (negative-going / HIGH-to-LOW edge triggered). Schmitt-trigger input. |+| 12 | 2B | input | Multivibrator 2 trigger input B (positive-going / LOW-to-HIGH edge triggered). Schmitt-trigger input. |+| 13 | 2nCD | input | Multivibrator 2 direct reset input, active LOW. A LOW level terminates the output pulse immediately. |+| 14 | 2REXT/CEXT | passive | Multivibrator 2 external resistor / capacitor connection. REXT ties to VCC; CEXT ties between this pin and 2CEXT. Pulse width TW = 0.7 x REXT x CEXT. |+| 15 | 2CEXT | passive | Multivibrator 2 external capacitor connection. Always connected to ground side of CEXT. |+| 16 | VCC | power_in | Supply voltage, 2.0 V to 6.0 V (recommended). Absolute maximum 7.0 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | TSSOP-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++Same part, different packaging or reel option.++- `74HC4538PW-Q100118`+- `74HC4538D-Q100`++## CAD (KiCad official)++- Symbol: `74HC4538PW-Q100118`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nexperia datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590371444535291904) (17 pp, sha256 `0cb248d4f3d3ea23`, retrieved 2026-08-17, tier: lcsc)+- **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/74hc4538pw-q100118-datasheet.pdf)

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