Mitsubishi A1SX42-S1 — DC Input Unit

Part number	A1SX42-S1
Brand	Mitsubishi
Description	DC Input Unit
Manufacturer	Mitsubishi
Product Type	DC input unit
Product Line	A Series
Part Number	A1SX42-S1
Weight	0.50 lbs (0.23 kg)
Input Points	64 points
Isolation Method	Photocoupler
Rated Input Voltage	DC 24V
Rated Input Current	Approximately 5mA
Response Time	0.3ms
Input Common Method	32 points/common
External Wiring Connection Method	40-pin connector x 2
Operating Voltage Range	19.2V to 26.4V (DC)
ON Voltage Rating	18.5V (DC) or higher
ON Current Rating	3.5mA or higher
OFF Voltage Rating	3V (DC) or lower
OFF Current Rating	1.7mA or lower
Input Resistance Rating	Approximately 4.7 kiloohms

Mitsubishi Electric's A1SX42-S1 Melsec Input Module is a great option if you need a dependable digital input module for your industrial automation needs. The photocoupler isolation technique used in its 64 input locations makes it very secure. The module has a short reaction time of 0.3 ms, requires an input voltage of 24 V DC, and draws 5 mA of current. Its small form factor, 40-pin...

Compatibility data for this part number is being verified. Send an RFQ with your equipment model and serial — our suppliers confirm fitment before quoting.

Data compiled from 1 verified source. Last reviewed 2026-08-16.