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Texas Instruments SN74HC540N — Memory (DRAM / SRAM / Flash / EEPROM)
Texas Instruments

SN74HC540N 74HC Inverting Buffer, 3-State, 20-DIP, Active

MPNSN74HC540N
End of Life

Texas Instruments 74HC series, Buffer, Inverting, 1-Element, 8-Bit per Element, 3-State Output, 2V to 6V Supply, Through Hole, 20-DIP (0.300", 7.62mm), -40°C to 85°C.

$0.85Ref. price · indicative, final on quote
SN74HC540N datasheet
Packaging20-DIP (0.300", 7.62mm)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
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Specifications

SN74HC540N Technical Specifications
ParameterValue
Series74HC
Logic typeBuffer, Inverting
Output type3-State
Mounting typeThrough Hole
Voltage2V ~ 6V
Current - output high, low7.8mA, 7.8mA
Operating temperature-40°C ~ 85°C (TA)
PackageTube
Case20-DIP (0.300\", 7.62mm)
Number of elements1
Number of bits per element8

Product details

Eight-bit inverting line driver with 3-state control

The Texas Instruments SN74HC540N is an 8-bit inverting buffer with 3-state outputs, built on the 74HC logic family. It takes eight input signals and delivers the inverted logic levels to the outputs, with a common output-enable (OE) pin that puts all outputs into a high-impedance state when pulled high. This makes it a straightforward choice for driving a data bus where the bus direction is fixed but bus contention must be avoided — typical in memory-interface, address-latch, or general-purpose line-driver roles on a 5V or 3.3V backplane. The wide supply range from 2V to 6V covers both TTL-compatible 5V rails and lower-voltage logic systems, and the industrial temperature range (-40°C to 85°C) suits factory-floor control cabinets, outdoor telecom gear, and similar environments where the board sees ambient swings.

What the 7.8 mA output drive means for your bus

The SN74HC540N sources and sinks 7.8 mA per output at 5V. That is enough to drive one or two standard 74HC or 74HCT inputs, or a low-power LED indicator.

Frequently asked questions

Can SN74HC540N be used as a non-inverting buffer?

No, the SN74HC540N is an inverting buffer — the output is the logical inverse of the input. For a non-inverting buffer with the same pinout, use the SN74HC541 (which is the non-inverting sibling in the same 74HC family).

What is the difference between SN74HC540 and SN74HC541?

The SN74HC540 is an inverting buffer; the SN74HC541 is a non-inverting buffer. Both are 8-bit, 3-state, 20-pin DIP parts with the same pinout except for the inversion. Choose the SN74HC540 when you need inverted logic on the bus; choose the SN74HC541 when you need the signal polarity preserved.