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Analog Devices MAX491CPD+ — Discrete Semiconductors

MAX491CPD+ RS-422/RS-485 Transceiver, Full Duplex, 2.5 Mbps

MPNMAX491CPD+
End of Life

Maxim Integrated MAX491CPD+, RS-422/RS-485 transceiver, full duplex, 1 driver / 1 receiver, 2.5 Mbps data rate, 4.75V–5.25V supply, 0°C–70°C, 14-pin DIP (0.300") through-hole.

$5.99Ref. price · indicative, final on quote
Analog Devices MAX491CPD+ datasheet (PDF)
Packaging14-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX491CPD+ specifications
ParameterValue
TypeTransceiver
MountingThrough Hole
Supply voltage4.75V ~ 5.25V
ProtocolRS422, RS485
Operating temperature0°C ~ 70°C
DuplexFull
PackageTube
Data rate2.5Mbps
Case14-DIP (0.300\", 7.62mm)
Receiver hysteresis70 mV
Number of drivers (Receivers)1/1

Product details

RS-422/RS-485 full-duplex transceiver in a 14-pin DIP

The Maxim Integrated MAX491CPD+ is a single-channel RS-422/RS-485 transceiver that handles full-duplex communication over a single twisted pair or two pairs.

Full duplex — one pair for transmit, one for receive

Full-duplex operation means the driver and receiver are active simultaneously, so the MAX491CPD+ needs two twisted pairs: one for transmit and one for receive. This contrasts with half-duplex RS-485 transceivers that share a single pair and require direction control via a DE/RE pin.

The 14-pin DIP (0.300" body width) is a through-hole package that fits standard pitch sockets or can be soldered directly into plated through-holes. The supplier device package is 14-PDIP.

It is ROHS3 compliant.

Frequently asked questions

What is the difference between MAX491 and MAX491CPD+?

The MAX491CPD+ is the lead-free / ROHS3-compliant version of the original MAX491. The electrical specifications — full-duplex RS-422/RS-485 transceiver, 2.5 Mbps data rate, 5 V supply, 0°C to 70°C range, 14-pin DIP package — are identical between the two. The MAX491CPD+ can be used as a direct replacement for the MAX491 in existing designs.

Is MAX491CPD+ compatible with 3.3V logic?

No. The MAX491CPD+ requires a 4.75 V to 5.25 V supply and its logic inputs are referenced to that 5 V rail. It is not rated for 3.3 V logic levels. For 3.3 V RS-485 transceivers, look at parts like the MAX3485 family.