The and MAX3232 are both 2-driver/2-receiver RS-232 transceivers designed to bridge the gap between low-voltage TTL/CMOS logic (found in modern microcontrollers like the ESP32) and the higher voltage RS-232 standards used by PCs and industrial equipment. While they are often treated as direct drop-in replacements, there are subtle differences in their operating range and power efficiency. Key Technical Comparison MAX3232 (Analog Devices/Maxim) SP3232 (MaxLinear/Exar) Supply Voltage (Vcc) 3.0V to 5.5V 3.0V to 5.5V (Standard) / 2.7V (E-Series) Min. Data Rate 120 kbps (Standard) / 460 kbps (EH variant) External Capacitors 4 x 0.1μF 4 x 0.1μF Output Voltage True RS-232 levels (±5.5V typ.) EIA/TIA-562 levels (±3.7V) at 2.7V Critical Differences for Your Design MAX3222/MAX3232/MAX3237/MAX3241 - Analog Devices
Both chips advertise ESD protection, but read the fine print. sp3232+vs+max3232+exclusive
Let’s strip away the marketing and look at the raw numbers. The following exclusive comparison focuses on the most common variants: and SP3232EEN . Data Rate 120 kbps (Standard) / 460 kbps
are functionally identical RS-232 transceivers designed for level conversion between low-voltage logic (3.3V/5.5V) and standard RS-232 signals sp3232+vs+max3232+exclusive
Both are rated for 120kbps to 250kbps, though high-end Maxim variants can sometimes push toward 1Mbps, whereas SP3232 units usually adhere strictly to the lower speed ratings found in their baseline documentation. Market Availability and Cost