±10kV ESD-Protected, Quad 5V RS-485/RS-422 Transmitters

Hot-Swap Capable Inputs Eliminate Erroneous Data Transmission During Circuit Initialization

Please check latest availability status for a specific part variant.


The MAX3040–MAX3045 is a family of 5V quad RS-485/RS-422 transmitters designed for digital data transmission over twisted-pair balanced lines. All transmitter outputs are protected to ±10kV using the Human Body Model. The MAX3040/MAX3043 (250kbps) and the MAX3041/MAX3044 (2.5Mbps) are slew-rate limited transmitters that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free transmission.

The MAX3040–MAX3045 feature a hot-swap capability that eliminates false transitions on the data cable during power-up or hot insertion. The MAX3042B/MAX3045B are optimized for data transfer rates up to 20Mbps, the MAX3041/MAX3044 for data rates up to 2.5Mbps, and the MAX3040/MAX3043 for data rates up to 250kbps. The MAX3040–MAX3045 offer optimum performance when used with the MAX3093E or MAX3095 5V quad differential line receivers or MAX3094E/MAX3096 3V quad differential line receivers.

The MAX3040–MAX3045 are ESD-protected pin-compatible, low-power upgrades to the industry-standard 'SN75174 and 'DS26LS31C. They are available in space-saving TSSOP, narrow SO, and wide SO packages.
MAX3040, MAX3041, MAX3042: Pin Configuration MAX3040, MAX3041, MAX3042: Pin Configuration Enlarge+

Key Features

  • ESD Protection: ±10kV—Human Body Model
  • Single +5V Operation
  • Guaranteed Device-to-Device Skew (MAX3040/MAX3041/MAX3043/MAX3044)
  • Pin-Compatible with 'SN75174, '26LS31C and LTC487
  • Hot-Swappable for Telecom Applications
  • Up to 20Mbps Data Rate (MAX3042B/MAX3045B)
  • Slew-Rate Limited (Data Rates at 2.5Mbps and 250kbps)
  • 2nA Low-Power Shutdown Mode
  • 1mA Operating Supply Current
  • ±2kV EFT Fast Transient Burst Immunity per IEC 1000-4-4
  • Level 2 Surge Immunity per IEC 1000-4-5, Unshielded Cable Model
  • Ultra-Small 16-Pin TSSOP, 16-Pin Narrow SO, and Wide 16-Pin SO


  • Handheld Equipment
  • Industrial Motor Control
  • Industrial PLCs
  • Networking
  • Telecommunications Equipment
  • Transmitter for ESD-Sensitive Applications

See parametric specs for RS-485/RS-422 Line Driver/Receivers (208)

Part NumberTx/RxVSUPPLY
Data Rate
Tx ENICC (Shutdn.)
Slew Rate LimitingOper. Temp.
(typ)(min)(typ)(See Notes)
MAX3042B 4Tx5120000Yes0.002No
-40 to +85
0 to +70
$3.03 @1k
MAX3045B 20000
$3.03 @1k
MAX3040 250
SOIC (N)/16
SOIC (W)/16
$3.18 @1k
MAX3041 2500
SOIC (N)/16
SOIC (W)/16
$3.18 @1k
MAX3043 250
SOIC (N)/16
SOIC (W)/16
$3.18 @1k
MAX3044 2500
SOIC (N)/16
SOIC (W)/16
$3.18 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX3044 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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