Mitsubishi A1SX42 — The Mitsubishi A1SX42 is an input/output (I/O) module from the MELSEC-A series that is both small and powerful

Part number	A1SX42
Brand	Mitsubishi
Description	The Mitsubishi A1SX42 is an input/output (I/O) module from the MELSEC-A series that is both small and powerful
Manufacturer	Mitsubishi
Product Line	A Series
Part Number	A1SX42
Weight	0.88 lbs (0.40 kg)
Number of Input Points	64 points
Isolation Method	Photocoupler
Rated Input Voltage	12/24 V DC
Rated Input Current	Approx 2 mA/5 mA
Operating Voltage Range	10.2 to 26.4 V DC (ripple < 5%)
Max. Simultaneous Inputs	50% ON (at 26.4 V DC)
ON Voltage / ON Current	8 V DC or higher / 2 mA or higher
OFF Voltage / OFF Current	4 V DC or lower / 0.6 mA or lower
Input Resistance	Approx 5 k ohms
Response Time OFF - ON	10 ms or less (24 V DC)
Response Time ON - OFF	10 ms or less (24 V DC)
Common Terminal Arrangement	32 points / common terminals: 1B1, 1B2, 2B1, 2B2
Internal Current Consumption	90 mA (TYP, all points ON)

The Mitsubishi A1SX42 is an input/output (I/O) module from the MELSEC-A series that is both small and powerful. It features 64 DC digital input points with fast 10 ms response rates; they were developed specifically for use with programmable logic controllers (PLCs). The signal integrity is protected by the positive common end design and the photocoupler isolation. It's a space-saving...

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.