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Texas Instruments SN74LS19AN — DC-DC Power Modules

SN74LS19AN 74LS Hex Schmitt-Trigger Inverter, 30ns, 14-DIP

MPNSN74LS19AN
End of Life

Texas Instruments 74LS series, SN74LS19AN, Hex Schmitt-Trigger Inverter, 6 circuits, 1 input per circuit, 30ns propagation delay @ 5V, 15pF, 400µA / 8mA output drive, 4.75V ~ 5.25V supply, 0°C ~ 70°C, 14-DIP (0.300", 7.62mm) through-hole package, Tube.

$2.26Ref. price · indicative, final on quote
Texas Instruments SN74LS19AN datasheet (PDF)
Packaging14-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Series74LS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

SN74LS19AN specifications
ParameterValue
Series74LS
Logic typeInverter
MountingThrough Hole
Supply voltage4.75V ~ 5.25V
Current - output high, low400µA, 8mA
I/O channels1
Operating temperature0°C ~ 70°C
PackageTube
FeaturesSchmitt Trigger
Case14-DIP (0.300\", 7.62mm)
Number of circuits6
Input logic level - low0.75V
Input logic level - high2.15V
Max propagation delay @ v, max CL30ns @ 5V, 15pF

Product details

The SN74LS19AN is a hex inverter from the 74LS Schottky TTL family, with Schmitt-trigger inputs on all six gates. It takes a single input per inverter and outputs the logical complement, with built-in hysteresis that cleans up slow or noisy edges — useful for switch debouncing, oscillator circuits, or squaring up a waveform from a sensor. The 14-DIP through-hole package suits breadboard prototyping, legacy PCB retrofits, and designs that avoid surface-mount assembly. Supply range is 4.75 V to 5.25 V, commercial temperature grade 0°C to 70°C, so it is sized for benchtop, office, or indoor equipment — not the engine bay or a factory floor with wide thermal swings.

Maximum propagation delay is 30 ns at 5 V supply and 15 pF load. Output drive is 400 µA source and 8 mA sink.

Active production — no LTB to plan around

Frequently asked questions

What is the propagation delay and output drive of SN74LS19AN?

Output drive capability is 400 µA source and 8 mA sink.

What is the difference between SN74LS19AN and SN74LS14AN?

Both are 74LS hex Schmitt-trigger inverters in 14-DIP packages with identical pinouts. The SN74LS19AN is functionally equivalent to the SN74LS14AN — the difference is in TI's internal test specifications, not in the published datasheet ratings. For all practical design and sourcing purposes, they are interchangeable.

Can SN74LS19AN be replaced with 74HC14?

A 74HC14 (e.g., SN74HC14N) is a functional replacement — same hex Schmitt-inverter logic, same 14-DIP footprint. The key difference is logic family: 74HC runs on 2 V to 6 V supply, has CMOS input thresholds (roughly 0.3×VCC and 0.7×VCC), and faster propagation delay (~15 ns). The 74LS19AN uses TTL thresholds (0.75 V / 2.15 V) and a 5 V-only supply. If the downstream logic is 74LS or 5 V TTL, the 74LS19AN is the drop-in; if the rest of the board is HC/HCT, the 74HC14 is a better fit.