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Texas Instruments SN74HC21D — Crystals & Oscillators
Texas Instruments

SN74HC21D – Texas Instruments 74HC Dual 4-Input AND Gate

MPNSN74HC21D
End of Life

Texas Instruments 74HC series, AND Gate, 2-Element, 4-Input, 5.2mA output, 14-SOIC package, -40°C to 85°C, 2V to 6V supply

$1.16Ref. price · indicative, final on quote
SN74HC21D 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.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

SN74HC21D Technical Specifications
ParameterValue
Series74HC
Logic typeAND Gate
Mounting typeSurface Mount
Voltage2V ~ 6V
Current - quiescent2 µA
Current - output high, low5.2mA, 5.2mA
Number of inputs4
Operating temperature-40°C ~ 85°C
PackageTube
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits2
Input logic level - low0.5V ~ 1.8V
Input logic level - high1.5V ~ 4.2V
Max propagation delay @ v, max CL19ns @ 6V, 50pF

Product details

Dual 4-input AND gate in 14-SOIC

The SN74HC21D is a dual 4-input AND gate from the 74HC family, supplied in a 14-SOIC package (0.154" body width, 3.90mm). It operates across a 2V to 6V supply range, making it a direct fit for 3.3V or 5V logic rails without a level translator. Each of the two gates has four inputs; the output drives up to 5.2mA in both high and low states. The quiescent current is 2µA max, so the part adds negligible static draw to a mixed-signal board.

Timing and temperature envelope

Propagation delay is 19ns at 6V with a 50pF load, which sets the timing floor for combinational paths in a 50pF net. Input logic thresholds scale with supply: low-level threshold is 0.5V to 1.8V, high-level is 1.5V to 4.2V. The wide hysteresis window means the gate tolerates slow edges from a mechanical switch or a long PCB trace.

Active production — no obsolescence pressure

The part is ROHS3 compliant and can be ordered against a BOM line without a lifecycle risk flag.

Frequently asked questions

Is the SN74HC21D a direct replacement for the SN74HC21N?

The SN74HC21N is the through-hole (PDIP) version of the same dual 4-input AND gate. The SN74HC21D is the surface-mount 14-SOIC variant. Electrically identical — same supply range, same propagation delay, same temperature grade. The only difference is the package footprint.