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Texas Instruments SN74ALS645AN — Analog & Data Acquisition

SN74ALS645AN 74ALS Transceiver, Non-Inverting, 3-State

MPNSN74ALS645AN
End of Life

Texas Instruments 74ALS series transceiver, non-inverting, 3-state, SN74ALS645AN, 8-bit, 4.5V-5.5V supply, 15mA/24mA output, 20-DIP (0.300", 7.62mm), through hole, tube.

$2.54Ref. price · indicative, final on quote
Texas Instruments SN74ALS645AN datasheet (PDF)
Packaging20-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Series74ALS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74ALS645AN specifications
ParameterValue
Series74ALS
Logic typeTransceiver, Non-Inverting
Output type3-State
MountingThrough Hole
Supply voltage4.5V ~ 5.5V
Current - output high, low15mA, 24mA
Operating temperature0°C ~ 70°C (TA)
PackageTube
Case20-DIP (0.300\", 7.62mm)
Number of elements1
Number of bits per element8

Product details

8-bit transceiver in 20-pin DIP — 74ALS family

The SN74ALS645AN is an 8-bit non-inverting transceiver with 3-state outputs from Texas Instruments' 74ALS logic family.

Through-hole DIP — board-fit for legacy and new designs

Housed in a 20-pin DIP (0.300", 7.62 mm) with through-hole mounting, the SN74ALS645AN is suited for breadboard prototyping, legacy board repair, or new designs where a DIP footprint is preferred. The supplier device package is 20-PDIP.

The 74ALS series provides a balance of speed and power for 5 V bus interfaces.

Frequently asked questions

Will the SN74ALS645AN drop into a board specified for the SN74LS645-1N?

The SN74LS645-1N is a 74LS-series transceiver in the same 20-pin DIP package with the same 8-bit non-inverting 3-state logic. Both parts operate from a 5 V supply and have a 0°C to 70°C temperature range. The 74ALS family offers lower power consumption than 74LS, but the pinout and function are identical — a direct drop-in replacement in most designs. Confirm the output current drive requirements against your load: the SN74ALS645AN delivers 15 mA high / 24 mA low, while the SN74LS645-1N is rated 15 mA high / 24 mA low as well.

What compliance documentation does Texas Instruments provide for the SN74ALS645AN?

Texas Instruments provides ROHS3 compliance for the SN74ALS645AN. No UL, IEC, or other agency certifications are listed in the product record.