component
74HC251D
Public Made by Adomby adom
Nexperia Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdown74HC251D
Nexperia · Signal Switches, Multiplexers, Decoders · SOIC-16
74HC251D from Nexperia, in a SOIC-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 | I3 | input | Data input I3 of the 8-input multiplexer, selected when S2 is LOW and S1 and S0 are HIGH with OE LOW; the datasheet gives the input range as 0 V to VCC and states the clamp diodes allow current-limited interfacing to voltages above VCC. |
| 2 | I2 | input | Data input I2 of the 8-input multiplexer, selected when S2 is LOW, S1 is HIGH and S0 is LOW with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 3 | I1 | input | Data input I1 of the 8-input multiplexer, selected when S2 is LOW, S1 is LOW and S0 is HIGH with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 4 | I0 | input | Data input I0 of the 8-input multiplexer, selected when S2, S1 and S0 are all LOW with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 5 | Y | output | Multiplexer output that follows the selected data input (non-inverting) and goes to the high-impedance OFF-state when OE is HIGH, per the function table. |
| 6 | ~{Y} | output | Complementary multiplexer output that carries the inverse of the selected data input and goes to the high-impedance OFF-state when OE is HIGH, per the function table. |
| 7 | OE | input | Output enable input; the function table shows a HIGH level forces Y and Y̅ to high-impedance (Z) and the Section 1 text says a HIGH on OE causes the high-impedance OFF-state, although Table 2 labels it active LOW. |
| 8 | GND | power_in | Ground pin at 0 V, the reference for all voltages stated in the datasheet. |
| 9 | S2 | input | Common data select input (most significant select bit) that, together with S1 and S0, chooses which data input I0 to I7 is routed to Y and Y̅. |
| 10 | S1 | input | Common data select input (middle select bit) that, together with S2 and S0, chooses which data input I0 to I7 is routed to Y and Y̅. |
| 11 | S0 | input | Common data select input (least significant select bit) that, together with S2 and S1, chooses which data input I0 to I7 is routed to Y and Y̅. |
| 12 | I7 | input | Data input I7 of the 8-input multiplexer, selected when S2, S1 and S0 are all HIGH with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 13 | I6 | input | Data input I6 of the 8-input multiplexer, selected when S2 is HIGH, S1 is HIGH and S0 is LOW with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 14 | I5 | input | Data input I5 of the 8-input multiplexer, selected when S2 is HIGH, S1 is LOW and S0 is HIGH with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 15 | I4 | input | Data input I4 of the 8-input multiplexer, selected when S2 is HIGH, S1 is LOW and S0 is LOW with OE LOW; the input range is 0 V to VCC and clamp diodes allow current-limited interfacing to voltages above VCC. |
| 16 | VCC | power_in | Supply voltage; the recommended range is 2.0 V to 6.0 V for 74HC251 and 4.5 V to 5.5 V for 74HCT251, with absolute maximum 7 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOIC-16 |
| Category | Logic |
| 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 |
|---|---|---|---|---|---|---|---|
| VCC supply voltage | VCC | -0.5 | 7 | V | 4 | ||
| Input clamping current | IIK | -20 | 20 | mA | VI < -0.5 V or VI > VCC + 0.5 V | 4 | |
| Output clamping current | IOK | -20 | 20 | mA | VO < -0.5 V or VO > VCC + 0.5 V | 4 | |
| Output current | IO | -25 | 25 | mA | VO = -0.5 V to (VCC + 0.5 V) | 4 | |
| Supply current | ICC | 50 | mA | 4 | |||
| Ground current | IGND | -50 | mA | 4 | |||
| Storage temperature | Tstg | -65 | 150 | °C | 4 | ||
| Total power dissipation | Ptot | 500 | mW | Tamb = -40 °C to +125 °C; derates 12.4 mW/K above 110 °C (SO16, note [1]) | 4 | ||
| Supply voltage (74HC251) | VCC | 2 | 5 | 6 | V | 5 | |
| Input voltage (74HC251) | VI | 0 | V | 5 | |||
| Output voltage (74HC251) | VO | 0 | V | 5 | |||
| Ambient temperature (74HC251) | Tamb | -40 | 25 | 125 | °C | 5 | |
| Input transition rise and fall rate | Δt/ΔV | 625 | ns/V | VCC = 2.0 V | 5 | ||
| Input transition rise and fall rate | Δt/ΔV | 1.67 | 139 | ns/V | VCC = 4.5 V | 5 | |
| Input transition rise and fall rate | Δt/ΔV | 83 | ns/V | VCC = 6.0 V | 5 | ||
| HIGH-level input voltage | VIH | 1.5 | 1.2 | V | VCC = 2.0 V; 25 °C | 5 | |
| HIGH-level input voltage | VIH | 1.5 | V | VCC = 2.0 V; -40 °C to +125 °C | 5 | ||
| HIGH-level input voltage | VIH | 3.15 | 2.4 | V | VCC = 4.5 V; 25 °C | 5 | |
| HIGH-level input voltage | VIH | 3.15 | V | VCC = 4.5 V; -40 °C to +125 °C | 5 | ||
| HIGH-level input voltage | VIH | 4.2 | 3.2 | V | VCC = 6.0 V; 25 °C | 5 | |
| HIGH-level input voltage | VIH | 4.2 | V | VCC = 6.0 V; -40 °C to +125 °C | 5 | ||
| LOW-level input voltage | VIL | 0.8 | 0.5 | V | VCC = 2.0 V; 25 °C | 5 | |
| LOW-level input voltage | VIL | 0.5 | V | VCC = 2.0 V; -40 °C to +125 °C | 5 | ||
| LOW-level input voltage | VIL | 2.1 | 1.35 | V | VCC = 4.5 V; 25 °C | 5 | |
| LOW-level input voltage | VIL | 1.35 | V | VCC = 4.5 V; -40 °C to +125 °C | 5 | ||
| LOW-level input voltage | VIL | 2.8 | 1.8 | V | VCC = 6.0 V; 25 °C | 5 | |
| LOW-level input voltage | VIL | 1.8 | V | VCC = 6.0 V; -40 °C to +125 °C | 5 | ||
| HIGH-level output voltage | VOH | 1.9 | 2 | V | VI = VIH or VIL; IO = -20 μA; VCC = 2.0 V; 25 °C | 5 | |
| HIGH-level output voltage | VOH | 1.9 | V | VI = VIH or VIL; IO = -20 μA; VCC = 2.0 V; -40 °C to +125 °C | 5 | ||
| HIGH-level output voltage | VOH | 4.4 | 4.5 | V | VI = VIH or VIL; IO = -20 μA; VCC = 4.5 V; 25 °C | 5 | |
| HIGH-level output voltage | VOH | 4.4 | V | VI = VIH or VIL; IO = -20 μA; VCC = 4.5 V; -40 °C to +125 °C | 5 | ||
| HIGH-level output voltage | VOH | 5.9 | 6 | V | VI = VIH or VIL; IO = -20 μA; VCC = 6.0 V; 25 °C | 5 | |
| HIGH-level output voltage | VOH | 5.9 | V | VI = VIH or VIL; IO = -20 μA; VCC = 6.0 V; -40 °C to +125 °C | 5 | ||
| HIGH-level output voltage | VOH | 3.98 | 4.32 | V | VI = VIH or VIL; IO = -4.0 mA; VCC = 4.5 V; 25 °C | 5 | |
| HIGH-level output voltage | VOH | 3.7 | V | VI = VIH or VIL; IO = -4.0 mA; VCC = 4.5 V; -40 °C to +125 °C | 5 | ||
| HIGH-level output voltage | VOH | 5.48 | 5.81 | V | VI = VIH or VIL; IO = -5.2 mA; VCC = 6.0 V; 25 °C | 5 | |
| HIGH-level output voltage | VOH | 5.2 | V | VI = VIH or VIL; IO = -5.2 mA; VCC = 6.0 V; -40 °C to +125 °C | 5 | ||
| LOW-level output voltage | VOL | 0 | 0.1 | V | VI = VIH or VIL; IO = 20 μA; VCC = 2.0 V; 25 °C | 5 | |
| LOW-level output voltage | VOL | 0.1 | V | VI = VIH or VIL; IO = 20 μA; VCC = 2.0 V; -40 °C to +125 °C | 5 | ||
| LOW-level output voltage | VOL | 0.15 | 0.26 | V | VI = VIH or VIL; IO = 4.0 mA; VCC = 4.5 V; 25 °C | 5 | |
| LOW-level output voltage | VOL | 0.4 | V | VI = VIH or VIL; IO = 4.0 mA; VCC = 4.5 V; -40 °C to +125 °C | 5 | ||
| LOW-level output voltage | VOL | 0.16 | 0.26 | V | VI = VIH or VIL; IO = 5.2 mA; VCC = 6.0 V; 25 °C | 5 | |
| Input leakage current | II | -0.1 | 0.1 | μA | VI = VCC or GND; VCC = 6.0 V; 25 °C | 6 | |
| Input leakage current | II | -1 | 1 | μA | VI = VCC or GND; VCC = 6.0 V; -40 °C to +125 °C | 6 | |
| OFF-state output current | IOZ | -0.5 | 0.5 | μA | VI = VIH or VIL; VO = VCC or GND; VCC = 6.0 V; 25 °C | 6 | |
| OFF-state output current | IOZ | -10 | 10 | μA | VI = VIH or VIL; VO = VCC or GND; VCC = 6.0 V; -40 °C to +125 °C | 6 | |
| Supply current | ICC | 8 | μA | VI = VCC or GND; IO = 0 A; VCC = 6.0 V; 25 °C | 6 | ||
| Supply current | ICC | 160 | μA | VI = VCC or GND; IO = 0 A; VCC = 6.0 V; -40 °C to +125 °C | 6 | ||
| Propagation delay In to Y | tpd | 50 | 170 | ns | In to Y; see Fig. 6; CL = 50 pF; VCC = 2.0 V; 25 °C | 7 | |
| Propagation delay In to Y | tpd | 18 | 34 | ns | In to Y; see Fig. 6; CL = 50 pF; VCC = 4.5 V; 25 °C | 7 | |
| Propagation delay In to Y | tpd | 14 | 29 | ns | In to Y; see Fig. 6; CL = 50 pF; VCC = 6.0 V; 25 °C | 7 | |
| Propagation delay Sn to Y | tpd | 66 | 205 | ns | Sn to Y; see Fig. 7; CL = 50 pF; VCC = 2.0 V; 25 °C | 7 | |
| Propagation delay Sn to Y | tpd | 24 | 41 | ns | Sn to Y; see Fig. 7; CL = 50 pF; VCC = 4.5 V; 25 °C | 7 | |
| Propagation delay Sn to Y | tpd | 19 | 35 | ns | Sn to Y; see Fig. 7; CL = 50 pF; VCC = 6.0 V; 25 °C | 7 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | per input pin; Sn input - 150 540 - 675 - 735 μA input | 6 |
CAD (KiCad official)
- Symbol:
74HC251D - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
74hc251d-etched.step/74hc251d-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);74hc251d.step/74hc251d.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Nexperia datasheet (16 pp, sha256
548cffe1beed1ca5, retrieved 2026-10-18, 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).