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Texas Instruments SN74HCT08D — Sensors & Transducers
Texas Instruments

SN74HCT08D TI 74HCT Quad 2-Input AND Gate

MPNSN74HCT08D
End of Life

Texas Instruments 74HCT series, quad 2-input AND gate, 14-SOIC (0.154", 3.90mm width), 4.5V ~ 5.5V supply, -40°C ~ 85°C, 22ns max propagation delay at 5.5V/50pF.

$1.16Ref. price · indicative, final on quote
SN74HCT08D datasheet
Packaging14-SOIC (0.154", 3.90mm Width)
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

SN74HCT08D Technical Specifications
ParameterValue
Series74HCT
Logic typeAND Gate
Mounting typeSurface Mount
Voltage4.5V ~ 5.5V
Current - quiescent2 µA
Current - output high, low4mA, 4mA
Number of inputs2
Operating temperature-40°C ~ 85°C
PackageTube
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits4
Input logic level - low0.8V
Input logic level - high2V
Max propagation delay @ v, max CL22ns @ 5.5V, 50pF

Product details

Why the 22 ns propagation delay matters for TTL replacement

The SN74HCT08D is a quad 2-input AND gate from the 74HCT family, designed to be a pin-for-pin, function-compatible drop-in for 74LS08 TTL gates in 5V systems. Its input logic thresholds (0.8V low, 2V high) match TTL levels, so it directly replaces a 74LS08 without changing the surrounding pull-up resistors or driver stages. The max propagation delay of 22 ns at 5.5V, 50pF is the critical timing spec: it is slower than a typical 74LS08 (around 10-15 ns), so verify the bus timing budget — if your system already runs near the 74LS08's limit, the extra nanoseconds may cause setup/hold violations on the downstream flip-flop or latch.

Supply voltage and temperature range for industrial 5V rails

The SN74HCT08D operates from 4.5V to 5.5V, a tighter window than the 74HC08D (2V to 6V) but deliberately matched to the 5V ±10% rail common in legacy TTL systems.

Active lifecycle — no imminent EOL risk for BOM planning

The 14-SOIC package (0.154", 3.90mm width) is a standard JEDEC outline, widely second-sourced by multiple manufacturers — if TI supply tightens, a cross to a 74HCT08 in the same SOIC-14 footprint is straightforward. ROHS3 compliant.

Package and mounting — SOIC-14 layout fit

Surface-mount 14-SOIC package with 1.27 mm pitch. No exposed pad; standard reflow profile for lead-free solder per J-STD-020.

Frequently asked questions

What is the difference between SN74HCT08D and SN74HC08D?

The SN74HCT08D has TTL-compatible input thresholds (0.8V low, 2V high) and a 4.5V-5.5V supply range, while the SN74HC08D uses CMOS thresholds (typically 0.3×Vcc and 0.7×Vcc) and works from 2V to 6V. In a 5V system with TTL-level inputs, the HCT version is the correct drop-in for 74LS08; the HC version may not reliably recognize a TTL low signal. Propagation delays are similar — both around 22 ns at 5V, 50pF.

Can SN74HCT08D replace a 74LS08?

Yes, the SN74HCT08D is designed as a direct TTL-compatible replacement for the 74LS08. Pinout and function are identical. The key trade-off is propagation delay: the HCT part has a max of 22 ns at 5.5V, 50pF, while a typical 74LS08 is faster (~10-15 ns). Verify that your system's timing budget can absorb the extra delay — especially on critical paths like address decoding or clock gating.