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Texas Instruments SN74LS645-1N — Signal Isolation
Texas Instruments

SN74LS645-1N 74LS Transceiver, Non-Inverting, 3-State

MPNSN74LS645-1N
End of Life

Texas Instruments SN74LS645-1N, series 74LS, logic type Transceiver Non-Inverting, output 3-State, 8-bit, 1 element, supply 4.75V~5.25V, output current 15mA/48mA, through hole 20-DIP (0.300", 7.62mm), 20-PDIP, operating temperature 0°C~70°C, tube.

$2.74Ref. price · indicative, final on quote
SN74LS645-1N datasheet
Packaging20-DIP (0.300", 7.62mm)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

SN74LS645-1N Technical Specifications
ParameterValue
Series74LS
Logic typeTransceiver, Non-Inverting
Output type3-State
Mounting typeThrough Hole
Voltage4.75V ~ 5.25V
Current - output high, low15mA, 48mA
Operating temperature0°C ~ 70°C (TA)
PackageTube
Case20-DIP (0.300\", 7.62mm)
Number of elements1
Number of bits per element8

Product details

Output drive and bus loading

The 15mA high-level and 48mA low-level output currents are typical for 74LS transceivers. The asymmetric sink-to-source ratio means the part can drive a heavier load when pulling a line low — useful for bus architectures where the low state is the active drive. The 3-state outputs allow multiple transceivers to share a common data bus without contention, controlled by the output-enable pins.

Temperature grade and environment

Rated for commercial temperature range 0°C to 70°C, this part is intended for indoor, temperature-controlled environments such as benchtop instrumentation, office equipment, and factory-floor PLC racks that are not exposed to extreme heat or cold. Not specified for automotive or extended industrial use.

Frequently asked questions

What is the difference between SN74LS645-1N and SN74LS245?

Both are 8-bit bus transceivers in the 74LS family, but the SN74LS645-1N is non-inverting while the SN74LS245 is inverting. The pinouts differ accordingly.

Is SN74LS645-1N compatible with 5V TTL logic?

Yes, the 4.75V to 5.25V supply range and 15mA/48mA output drive make it directly compatible with standard 5V TTL logic families.

What is the pinout diagram for SN74LS645-1N?

The pinout is standard for a 20-pin DIP transceiver with separate data ports (A and B), output-enable, and direction control. Refer to the manufacturer's datasheet for the exact pin assignments.