| Criterion | Choose MAX3232 when… | Choose SP3232 when… | |-----------|----------------------|----------------------| | | You need the ‘E’ version’s 1μA standby (exclusive) | Not available – trade‑off for higher temp range | | Temperature | Commercial 0–70°C is sufficient | You need –40°C to +125°C operation | | Capacitor flexibility | You prefer 1μF caps at 5V | You want 0.1μF for all supply voltages | | Noise immunity | Standard hysteresis is adequate | High noise floors – extra 0.5V hysteresis helps | | PCB space | µMAX is fine | You need the smallest 4x4mm QFN package | | Data rate | 250kbps typical is enough | You’re pushing 1Mbps with special cap values |
SP3232+ and MAX3232+ are functionally similar modern RS-232 transceivers that convert between TTL/CMOS UART levels and RS-232. The optimal choice depends on the specific electrical specs (output swing, ICC, ESD), package/pinout compatibility, availability, cost, and application environment. Always verify the exact datasheet numbers for the candidate part and prototype under expected real-world conditions before committing to a production design. sp3232+vs+max3232+exclusive
: Both devices use a "dual charge pump" that requires four external capacitors (typically 0.1µF ) to generate the necessary RS-232 voltages from a single low-voltage supply. | Criterion | Choose MAX3232 when… | Choose
| Feature | MAX3232 | SP3232+ | | :--- | :--- | :--- | | | 3.0V – 5.5V | 3.0V – 5.5V (Identical) | | Data Rate | 250kbps | 250kbps (Identical) | | ESD Protection (HBM) | ±8kV (Human Body Model) | ±15kV (Exclusive advantage) | | Slew Rate | Standard (<30V/µs) | Tighter control (Better EMI reduction) | | Auto-Powerdown | No (on standard version) | Yes (Saves battery life) | | Operating Temp | 0°C to 70°C | -40°C to +85°C (Industrial grade) | | Price | $$ (Higher) | $ (Lower) | : Both devices use a "dual charge pump"