74HC14 hex Schmitt-trigger inverter
Six independent inverters with Schmitt-trigger inputs and push-pull outputs.
Pinout
Arrows show signal direction between paired pins.
8 · 4Y
Push-pull output · 0 V to VCC
Connect to a compatible logic input. Leave it open when unused. Avoid tying push-pull outputs together.
All 14 pins
| Pin | Name | Role | Range |
|---|---|---|---|
| 1 | 1A | Schmitt-trigger input | 0 V to VCC |
| 2 | 1Y | Push-pull output | 0 V to VCC |
| 3 | 2A | Schmitt-trigger input | 0 V to VCC |
| 4 | 2Y | Push-pull output | 0 V to VCC |
| 5 | 3A | Schmitt-trigger input | 0 V to VCC |
| 6 | 3Y | Push-pull output | 0 V to VCC |
| 7 | GND | Ground reference | 0 V |
| 8 | 4Y | Push-pull output | 0 V to VCC |
| 9 | 4A | Schmitt-trigger input | 0 V to VCC |
| 10 | 5Y | Push-pull output | 0 V to VCC |
| 11 | 5A | Schmitt-trigger input | 0 V to VCC |
| 12 | 6Y | Push-pull output | 0 V to VCC |
| 13 | 6A | Schmitt-trigger input | 0 V to VCC |
| 14 | VCC | Positive supply | 2–6 V |
Inverter channels
Each channel has a fixed input and output. Below the falling threshold A reads LOW and Y is HIGH. Above the rising threshold A reads HIGH and Y is LOW. Between the two thresholds of a given gate, Y retains its previous state while powered.
Electrical limits
Recommended operation for TI SN74HC14 is VCC 2–6 V, free-air temperature −40 to +85 °C, and input and output voltages within the supply rails. All voltages are relative to GND.
Schmitt thresholds and hysteresis
Entries are min / typ / max in volts. Limits cover −40 to +85 °C. Typical values are at 25 °C.
| VCC | Rising Vₜ₊ | Falling Vₜ₋ | Hysteresis ΔVₜ |
|---|---|---|---|
| 2 V | 0.7 / 1.2 / 1.5 | 0.3 / 0.6 / 1 | 0.2 / 0.6 / 1.2 |
| 4.5 V | 1.55 / 2.5 / 3.13 | 0.9 / 1.6 / 2.45 | 0.4 / 0.9 / 2.1 |
| 6 V | 2.1 / 3.3 / 4.2 | 1.2 / 2 / 3.2 | 0.5 / 1.3 / 2.5 |
To guarantee switching across parts, drive above the rising maximum for HIGH and below the falling minimum for LOW. At 4.5 V, those boundaries are 3.13 V and 0.90 V respectively. The two threshold ranges describe variation across parts. Use the specified ΔVₜ for the threshold separation of one gate.
TI specifies no input transition-rate limit for this device. Slow edges can increase supply current. Check logic levels at the actual supply voltage. TI tabulates threshold limits at 2 V, 4.5 V and 6 V. The input clamp diodes make power sequencing and rail compatibility important when connecting another voltage domain.
Output levels at 4.5 V
| Output load magnitude | VOL max | VOH min |
|---|---|---|
| 20 µA | ≤ 0.1 V | ≥ 4.4 V |
| 4 mA | 0.33 V | 3.84 V |
Limits apply over −40 to +85 °C with a valid LOW or HIGH input. At 4.5 V and 50 pF, propagation delay is 12 ns typical at 25 °C and 31 ns maximum across the operating temperature range.
TI SCLS085L §§ 5.3, 5.5 and 5.7 specify operating and switching limits. The absolute maximum current ratings in § 5.1 are stress limits.
Package and documents
TI package code D · 8.65 × 3.9 mm nominal body · 1.27 mm lead pitch. Use TI’s package outline for footprint dimensions and tolerances.
TI lists these active order codes in its 18 September 2026 addendum. SN74HC14DR, SN74HC14DR.A, SN74HC14DRG3, SN74HC14DRG3.A, SN74HC14DRG4, SN74HC14DRG4.A. Obsolete codes in the same package SN74HC14D, SN74HC14DT.
- TI D package drawing (PDF)
- TI SNx4HC14 datasheet (PDF)· SCLS085L, Rev. L (February 2025), with package option addendum
- TI SN74HC14 product and ordering information
- TI Understanding Schmitt Triggers· SCEA046B, Rev. B (April 2025). Slow edges, noise, hysteresis and switch filtering.
TI SCLS085L § 4 shows the top-view pin assignments. § 11 includes the package option addendum and outline drawings.