
Maxim Integrated
The industry-standard part this family is based on; it is faster but not automotive qualified.
Finding a substitute for the automotive-grade TRS3232EQPWRQ1 involves balancing features. While several commercial-grade RS-232 transceivers offer similar functions and pinouts, they lack the target's critical AEC-Q100 qualification and extended temperature range.
Core electrical parameters like voltage and channel count are well-matched or improved.
All viable candidates use the same TSSOP-16 package, ensuring form-fit compatibility.
Using a non-automotive part in an automotive application carries significant reliability and liability risks.
No direct, drop-in replacement has been identified. All candidates lack the target's automotive qualification and 125°C maximum operating temperature.
Use a commercial-grade 3232-type transceiver like MAX3232EEUE+T, but only if the application can tolerate a lower max operating temperature (85°C) and does not strictly require AEC-Q100 qualification.
The primary risk is component failure in high-temperature automotive environments due to the lower temperature rating and lack of automotive-grade screening.

Maxim Integrated
The industry-standard part this family is based on; it is faster but not automotive qualified.
| Feature / factor | TRS3232EQPWRQ1 | MAX3232EEUE+T | ST3232EBTR | SN65C3232EPWR | Compatibility / risk |
|---|---|---|---|---|---|
| Package | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 — Package and pin count match.; ST3232EBTR: Package and pin count match.; SN65C3232EPWR: Package and pin count match.; UM3232EEUE: Package and pin count match. |
| Interface | 250 kbit/s | up to 1Mbps | 2/2 | 1 Mbit/s | up to 1Mbps / 2/2 / 1 Mbit/s — Candidate has a faster data rate.; ST3232EBTR: Number of drivers/receivers matches.; SN65C3232EPWR: Candidate has a faster data rate.; UM3232EEUE: Number of drivers/receivers matches. |
| Voltage | 3 V to 5.5 V | 3.0V to 5.5V | 3V to 5.5V | 3 V to 5.5 V | 3.0V to 5.5V / 3V to 5.5V / 3 V to 5.5 V — Supply voltage range matches.; ST3232EBTR: Supply voltage range matches.; SN65C3232EPWR: Supply voltage range matches.; UM3232EEUE: Supply voltage range matches. |
| Temperature | -40°C to 125°C | -40°C to +85°C | -40°C to 85°C | -40°C to 85°C | -40°C to +85°C / -40°C to 85°C — Candidate has a reduced maximum operating temperature.; ST3232EBTR: Candidate has a reduced maximum operating temperature.; SN65C3232EPWR: Candidate has a reduced maximum operating temperature.; UM3232EEUE: Candidate has a reduced maximum operating temperature. |
| Application | Yes (AEC-Q100) | No | No | No | No — Candidate is not automotive qualified.; ST3232EBTR: Candidate is not automotive qualified.; SN65C3232EPWR: Candidate is not automotive qualified.; UM3232EEUE: Candidate is not automotive qualified. |
For non-automotive use, MAX3232EEUE+T is a strong choice due to its industry-standard status and faster data rate. However, no candidate is a direct replacement for automotive applications due to qualification and temperature differences.