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Texas Instruments SN74LS244DWR — Logic ICs

SN74LS244DWR 74LS Buffer, Non-Inverting 3-State, 20-SOIC, 5V

MPNSN74LS244DWR
End of Life

Texas Instruments 74LS series, SN74LS244DWR, Buffer Non-Inverting, 3-State output, 4.75V~5.25V supply, 2 elements x 4 bits, 15mA/24mA output, 0°C~70°C, 20-SOIC surface mount.

$1.05Ref. price · indicative, final on quote
Texas Instruments SN74LS244DWR datasheet (PDF)
Packaging20-SOIC (0.295", 7.50mm Width)
RoHSROHS3 Compliant
Series74LS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74LS244DWR specifications
ParameterValue
Series74LS
Logic typeBuffer, Non-Inverting
Output type3-State
MountingSurface Mount
Supply voltage4.75V ~ 5.25V
Current - output high, low15mA, 24mA
Operating temperature0°C ~ 70°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case20-SOIC (0.295\", 7.50mm Width)
Number of elements2
Number of bits per element4

Product details

What this 74LS octal buffer does on your board

The Texas Instruments SN74LS244DWR is a non-inverting octal buffer with 3-state outputs, built on the 74LS low-power Schottky TTL logic family. The 3-state control lets you float the outputs when another device owns the bus.

5 V only — no mixed-voltage tricks

Don't try to feed it 3.3 V — it won't switch properly, and the TTL input thresholds expect a 5 V environment. If your design has moved to 3.3 V or lower, you need a different logic family like the 74LVTH or 74LVC series.

Temperature grade: indoor and office duty

It belongs in benchtop instruments, office peripherals, consumer electronics, and telecom equipment inside a climate-controlled rack.

The 74LS family has been in production for decades, and TI continues to support it.

The wide-body SOIC footprint is standard for 20-pin buffers — no surprises for the pick-and-place programmer.

Frequently asked questions

Is SN74LS244DWR compatible with 5V TTL logic?

Yes. The 74LS family is designed for 5 V TTL logic. Input thresholds are TTL-compatible, and the 3-state outputs drive standard TTL loads with 15 mA source / 24 mA sink capability.

What is the equivalent of SN74LS244DWR?

A pin-compatible functional equivalent within the same 74LS family is the SN74LS645-1N, but that is a transceiver (bidirectional), not a buffer, and comes in a through-hole package. For a closer match in function and package, the SN74ABT2245DW is a surface-mount transceiver with higher drive (32 mA), but it runs from 4.5 V minimum and has a wider temperature range. Neither is a drop-in replacement — verify the direction control and pinout against your board.