component
74AHC123AD
Public Made by Adomby adom
Nexperia Monostable Multivibrators, SO-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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74AHC123AD
Nexperia · Monostable Multivibrators · SO-16
74AHC123AD from Nexperia, in a SO-16. 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 | Negative-edge triggered input 1 (HIGH-to-LOW transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 2 | 1B | input | Positive-edge triggered input 1 (LOW-to-HIGH transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 3 | 1RD | input | Direct reset input 1, LOW level and positive-edge triggered, which terminates the output pulse. |
| 4 | 1Q | output | Active LOW output 1 of monostable 1. |
| 5 | 2Q | output | Active HIGH output 2 of monostable 2. |
| 6 | 2CEXT | passive | External capacitor connection 2; the datasheet recommends grounding this pin externally to GND for minimum noise generation. |
| 7 | 2REXT/CEXT | passive | External resistor and capacitor connection 2 that sets the output pulse width of monostable 2. |
| 8 | GND | power_in | Ground (0 V) reference for all voltages. |
| 9 | 2A | input | Negative-edge triggered input 2 (HIGH-to-LOW transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 10 | 2B | input | Positive-edge triggered input 2 (LOW-to-HIGH transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 11 | 2RD | input | Direct reset input 2, LOW level and positive-edge triggered, which terminates the output pulse. |
| 12 | 2Q | output | Active LOW output 2 of monostable 2. |
| 13 | 1Q | output | Active HIGH output 1 of monostable 1. |
| 14 | 1CEXT | passive | External capacitor connection 1; the datasheet recommends grounding this pin externally to GND for minimum noise generation. |
| 15 | 1REXT/CEXT | passive | External resistor and capacitor connection 1 that sets the output pulse width of monostable 1. |
| 16 | VCC | power_in | Supply voltage: 2.0 V to 5.5 V for 74AHC123A and 4.5 V to 5.5 V for 74AHCT123A (recommended operating conditions). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SO-16 |
| Category | Logic ICs |
| Pins | 16 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | -0.5 | 7 | V | 6 | ||
| Input voltage | VI | -0.5 | 7 | V | 6 | ||
| Input clamping current | IIK | -20 | mA | VI < -0.5 V | 6 | ||
| Output clamping current | IOK | -20 | 20 | mA | VO < -0.5 V or VO > VCC + 0.5 V | 6 | |
| Output current | IO | -25 | 25 | mA | VO = -0.5 V to (VCC + 0.5 V) | 6 | |
| Supply current | ICC | 75 | mA | 6 | |||
| Ground current | IGND | -75 | mA | 6 | |||
| Storage temperature | Tstg | -65 | 150 | °C | 6 | ||
| Total power dissipation | Ptot | 500 | mW | Tamb = -40 °C to +125 °C; SO16 derates 12.4 mW/K above 110 °C | 6 | ||
| Supply voltage | VCC | 2 | 5 | 5.5 | V | 74AHC123A | 6 |
| Input voltage | VI | 0 | 5.5 | V | 74AHC123A | 6 | |
| Output voltage | VO | 0 | V | max is VCC | 6 | ||
| Ambient temperature | Tamb | -40 | 25 | 125 | °C | 6 | |
| Input transition rise and fall rate | Δt/ΔV | 100 | ns/V | VCC = 3.3 V ± 0.3 V | 6 | ||
| Input transition rise and fall rate | Δt/ΔV | 20 | ns/V | VCC = 5.0 V ± 0.5 V | 6 | ||
| HIGH-level input voltage | VIH | 1.5 | V | VCC = 2.0 V; 25 °C | 7 | ||
| HIGH-level input voltage | VIH | 2.1 | V | VCC = 3.0 V; 25 °C | 7 | ||
| HIGH-level input voltage | VIH | 3.85 | V | VCC = 5.5 V; 25 °C | 7 | ||
| LOW-level input voltage | VIL | 0.5 | V | VCC = 2.0 V; 25 °C | 7 | ||
| LOW-level input voltage | VIL | 0.9 | V | VCC = 3.0 V; 25 °C | 7 | ||
| LOW-level input voltage | VIL | 1.65 | V | VCC = 5.5 V; 25 °C | 7 | ||
| HIGH-level output voltage | VOH | 1.9 | 2 | V | VI = VIH or VIL; IO = -50 μA; VCC = 2.0 V; 25 °C | 7 | |
| HIGH-level output voltage | VOH | 2.9 | 3 | V | VI = VIH or VIL; IO = -50 μA; VCC = 3.0 V; 25 °C | 7 | |
| HIGH-level output voltage | VOH | 4.4 | 4.5 | V | VI = VIH or VIL; IO = -50 μA; VCC = 4.5 V; 25 °C | 7 | |
| HIGH-level output voltage | VOH | 2.58 | V | VI = VIH or VIL; IO = -4.0 mA; VCC = 3.0 V; 25 °C | 7 | ||
| HIGH-level output voltage | VOH | 3.94 | V | VI = VIH or VIL; IO = -8.0 mA; VCC = 4.5 V; 25 °C | 7 | ||
| LOW-level output voltage | VOL | 0 | 0.1 | V | VI = VIH or VIL; IO = 50 μA; VCC = 2.0 V; 25 °C | 7 | |
| LOW-level output voltage | VOL | 0.36 | V | VI = VIH or VIL; IO = 4.0 mA; VCC = 3.0 V; 25 °C | 7 | ||
| Input leakage current, nREXT/CEXT | II | -0.25 | 0.25 | μA | VI = 5.5 V or GND; VCC = 0 V to 5.5 V; 25 °C | 7 | |
| Input leakage current, pins nA, nB, nRD | II | -0.1 | 0.1 | μA | VI = 5.5 V or GND; VCC = 0 V to 5.5 V; 25 °C | 7 | |
| Supply current | ICC | 4 | μA | VI = VCC or GND; IO = 0 A; VCC = 5.5 V; 25 °C | 7 | ||
| Supply current, active state (per circuit) | ICC | 160 | 250 | μA | VI = VCC or GND; VCC = 3.0 V; 25 °C | 7 | |
| Supply current, active state (per circuit) | ICC | 380 | 500 | μA | VI = VCC or GND; VCC = 4.5 V; 25 °C | 7 | |
| Supply current, active state (per circuit) | ICC | 560 | 750 | μA | VI = VCC or GND; VCC = 5.5 V; 25 °C | 7 | |
| Input capacitance | CI | 5 | 10 | pF | 25 °C | 7 | |
| Output capacitance | CO | 4 | pF | 25 °C | 7 | ||
| Propagation delay nA, nB to nQ, nQ | tpd | 7.4 | 20.6 | ns | VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 °C | 9 | |
| Propagation delay nA, nB to nQ, nQ | tpd | 10.5 | 24.1 | ns | VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 | |
| Propagation delay nA, nB to nQ, nQ | tpd | 5.1 | 12 | ns | VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 °C | 9 | |
| Propagation delay nA, nB to nQ, nQ | tpd | 7.3 | 14 | ns | VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ | tpd | 8.2 | 22.4 | ns | VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ | tpd | 11.7 | 25.9 | ns | VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ | tpd | 5.6 | 12.9 | ns | VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ | tpd | 8.1 | 14.9 | ns | VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ (reset) | tpd | 6.4 | 15.8 | ns | VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ (reset) | tpd | 9.2 | 19.3 | ns | VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ (reset) | tpd | 4.4 | 9.4 | ns | VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 °C | 9 | |
| Propagation delay nRD to nQ, nQ (reset) | tpd | 6.3 | 11.4 | ns | VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 | |
| Pulse width | tW | 115 | 240 | ns | CEXT = 28 pF; REXT = 2 kΩ; VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 | |
| Pulse width | tW | 100 | 200 | ns | CEXT = 28 pF; REXT = 2 kΩ; VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 | |
| Pulse width | tW | 90 | 100 | 110 | μs | CEXT = 0.01 μF; REXT = 10 kΩ; VCC = 3.0 V to 3.6 V; 25 °C | 9 |
| Pulse width | tW | 0.9 | 1 | 1.1 | ms | CEXT = 0.1 μF; REXT = 10 kΩ; VCC = 3.0 V to 3.6 V; 25 °C | 9 |
| External resistance | REXT | 5 | kΩ | VCC = 2.0 V | 11 | ||
| External resistance | REXT | 1 | kΩ | VCC > 3.0 V | 11 |
CAD (KiCad official)
- Symbol:
74AHC123AD - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SO-16 (KiCad packages3D, STEP)
- 3D model files:
74ahc123ad-etched.step/74ahc123ad-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);74ahc123ad.step/74ahc123ad.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Nexperia datasheet (20 pp, sha256
c251c1363d537163, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).
# 74AHC123AD
**Nexperia** · Monostable Multivibrators · SO-16
74AHC123AD from Nexperia, in a SO-16. 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 | Negative-edge triggered input 1 (HIGH-to-LOW transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 2 | 1B | input | Positive-edge triggered input 1 (LOW-to-HIGH transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 3 | 1RD | input | Direct reset input 1, LOW level and positive-edge triggered, which terminates the output pulse. |
| 4 | 1Q | output | Active LOW output 1 of monostable 1. |
| 5 | 2Q | output | Active HIGH output 2 of monostable 2. |
| 6 | 2CEXT | passive | External capacitor connection 2; the datasheet recommends grounding this pin externally to GND for minimum noise generation. |
| 7 | 2REXT/CEXT | passive | External resistor and capacitor connection 2 that sets the output pulse width of monostable 2. |
| 8 | GND | power_in | Ground (0 V) reference for all voltages. |
| 9 | 2A | input | Negative-edge triggered input 2 (HIGH-to-LOW transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 10 | 2B | input | Positive-edge triggered input 2 (LOW-to-HIGH transition triggers the monostable); inputs are overvoltage tolerant to 5.5 V. |
| 11 | 2RD | input | Direct reset input 2, LOW level and positive-edge triggered, which terminates the output pulse. |
| 12 | 2Q | output | Active LOW output 2 of monostable 2. |
| 13 | 1Q | output | Active HIGH output 1 of monostable 1. |
| 14 | 1CEXT | passive | External capacitor connection 1; the datasheet recommends grounding this pin externally to GND for minimum noise generation. |
| 15 | 1REXT/CEXT | passive | External resistor and capacitor connection 1 that sets the output pulse width of monostable 1. |
| 16 | VCC | power_in | Supply voltage: 2.0 V to 5.5 V for 74AHC123A and 4.5 V to 5.5 V for 74AHCT123A (recommended operating conditions). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SO-16 |
| Category | Logic ICs |
| Pins | 16 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | -0.5 | | 7 | V | | 6 |
| Input voltage | VI | -0.5 | | 7 | V | | 6 |
| Input clamping current | IIK | -20 | | | mA | VI < -0.5 V | 6 |
| Output clamping current | IOK | -20 | | 20 | mA | VO < -0.5 V or VO > VCC + 0.5 V | 6 |
| Output current | IO | -25 | | 25 | mA | VO = -0.5 V to (VCC + 0.5 V) | 6 |
| Supply current | ICC | | | 75 | mA | | 6 |
| Ground current | IGND | -75 | | | mA | | 6 |
| Storage temperature | Tstg | -65 | | 150 | °C | | 6 |
| Total power dissipation | Ptot | | | 500 | mW | Tamb = -40 °C to +125 °C; SO16 derates 12.4 mW/K above 110 °C | 6 |
| Supply voltage | VCC | 2 | 5 | 5.5 | V | 74AHC123A | 6 |
| Input voltage | VI | 0 | | 5.5 | V | 74AHC123A | 6 |
| Output voltage | VO | 0 | | | V | max is VCC | 6 |
| Ambient temperature | Tamb | -40 | 25 | 125 | °C | | 6 |
| Input transition rise and fall rate | Δt/ΔV | | | 100 | ns/V | VCC = 3.3 V ± 0.3 V | 6 |
| Input transition rise and fall rate | Δt/ΔV | | | 20 | ns/V | VCC = 5.0 V ± 0.5 V | 6 |
| HIGH-level input voltage | VIH | 1.5 | | | V | VCC = 2.0 V; 25 °C | 7 |
| HIGH-level input voltage | VIH | 2.1 | | | V | VCC = 3.0 V; 25 °C | 7 |
| HIGH-level input voltage | VIH | 3.85 | | | V | VCC = 5.5 V; 25 °C | 7 |
| LOW-level input voltage | VIL | | | 0.5 | V | VCC = 2.0 V; 25 °C | 7 |
| LOW-level input voltage | VIL | | | 0.9 | V | VCC = 3.0 V; 25 °C | 7 |
| LOW-level input voltage | VIL | | | 1.65 | V | VCC = 5.5 V; 25 °C | 7 |
| HIGH-level output voltage | VOH | 1.9 | 2 | | V | VI = VIH or VIL; IO = -50 μA; VCC = 2.0 V; 25 °C | 7 |
| HIGH-level output voltage | VOH | 2.9 | 3 | | V | VI = VIH or VIL; IO = -50 μA; VCC = 3.0 V; 25 °C | 7 |
| HIGH-level output voltage | VOH | 4.4 | 4.5 | | V | VI = VIH or VIL; IO = -50 μA; VCC = 4.5 V; 25 °C | 7 |
| HIGH-level output voltage | VOH | 2.58 | | | V | VI = VIH or VIL; IO = -4.0 mA; VCC = 3.0 V; 25 °C | 7 |
| HIGH-level output voltage | VOH | 3.94 | | | V | VI = VIH or VIL; IO = -8.0 mA; VCC = 4.5 V; 25 °C | 7 |
| LOW-level output voltage | VOL | | 0 | 0.1 | V | VI = VIH or VIL; IO = 50 μA; VCC = 2.0 V; 25 °C | 7 |
| LOW-level output voltage | VOL | | | 0.36 | V | VI = VIH or VIL; IO = 4.0 mA; VCC = 3.0 V; 25 °C | 7 |
| Input leakage current, nREXT/CEXT | II | -0.25 | | 0.25 | μA | VI = 5.5 V or GND; VCC = 0 V to 5.5 V; 25 °C | 7 |
| Input leakage current, pins nA, nB, nRD | II | -0.1 | | 0.1 | μA | VI = 5.5 V or GND; VCC = 0 V to 5.5 V; 25 °C | 7 |
| Supply current | ICC | | | 4 | μA | VI = VCC or GND; IO = 0 A; VCC = 5.5 V; 25 °C | 7 |
| Supply current, active state (per circuit) | ICC | | 160 | 250 | μA | VI = VCC or GND; VCC = 3.0 V; 25 °C | 7 |
| Supply current, active state (per circuit) | ICC | | 380 | 500 | μA | VI = VCC or GND; VCC = 4.5 V; 25 °C | 7 |
| Supply current, active state (per circuit) | ICC | | 560 | 750 | μA | VI = VCC or GND; VCC = 5.5 V; 25 °C | 7 |
| Input capacitance | CI | | 5 | 10 | pF | 25 °C | 7 |
| Output capacitance | CO | | 4 | | pF | 25 °C | 7 |
| Propagation delay nA, nB to nQ, nQ | tpd | | 7.4 | 20.6 | ns | VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 °C | 9 |
| Propagation delay nA, nB to nQ, nQ | tpd | | 10.5 | 24.1 | ns | VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 |
| Propagation delay nA, nB to nQ, nQ | tpd | | 5.1 | 12 | ns | VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 °C | 9 |
| Propagation delay nA, nB to nQ, nQ | tpd | | 7.3 | 14 | ns | VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ | tpd | | 8.2 | 22.4 | ns | VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ | tpd | | 11.7 | 25.9 | ns | VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ | tpd | | 5.6 | 12.9 | ns | VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ | tpd | | 8.1 | 14.9 | ns | VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ (reset) | tpd | | 6.4 | 15.8 | ns | VCC = 3.0 V to 3.6 V; CL = 15 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ (reset) | tpd | | 9.2 | 19.3 | ns | VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ (reset) | tpd | | 4.4 | 9.4 | ns | VCC = 4.5 V to 5.5 V; CL = 15 pF; 25 °C | 9 |
| Propagation delay nRD to nQ, nQ (reset) | tpd | | 6.3 | 11.4 | ns | VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 |
| Pulse width | tW | | 115 | 240 | ns | CEXT = 28 pF; REXT = 2 kΩ; VCC = 3.0 V to 3.6 V; CL = 50 pF; 25 °C | 9 |
| Pulse width | tW | | 100 | 200 | ns | CEXT = 28 pF; REXT = 2 kΩ; VCC = 4.5 V to 5.5 V; CL = 50 pF; 25 °C | 9 |
| Pulse width | tW | 90 | 100 | 110 | μs | CEXT = 0.01 μF; REXT = 10 kΩ; VCC = 3.0 V to 3.6 V; 25 °C | 9 |
| Pulse width | tW | 0.9 | 1 | 1.1 | ms | CEXT = 0.1 μF; REXT = 10 kΩ; VCC = 3.0 V to 3.6 V; 25 °C | 9 |
| External resistance | REXT | 5 | | | kΩ | VCC = 2.0 V | 11 |
| External resistance | REXT | 1 | | | kΩ | VCC > 3.0 V | 11 |
## CAD (KiCad official)
- Symbol: `74AHC123AD`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SO-16 (KiCad packages3D, STEP)
- 3D model files: `74ahc123ad-etched.step` / `74ahc123ad-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74ahc123ad.step` / `74ahc123ad.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74AHC123AD.pdf) (20 pp, sha256 `c251c1363d537163`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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](docs/74ahc123ad-datasheet.pdf)