Is there a pin-compatible replacement for RSM232?

Yes, parts like TD301D232H and TD501D232H share the same DIP8 package. However, they are not electrically identical drop-in replacements due to differences in supply voltage and data rate. Pinout should be verified via datasheet comparison.

What risks should I check before replacing RSM232?

First, confirm your system's supply voltage; the RSM232 supports a wide 3.15V-5.25V range, while alternatives may be 3.3V-only or 5V-only. Second, ensure the lower data rate of alternatives (e.g., 115.2kbps) is sufficient. Finally, check the pinout diagram to confirm compatibility.

RSM232 Alternatives, Datasheet & Cross Reference | YLPTEC

YLPTEC RSM232 is a versatile isolated RS-232 transceiver in a DIP8 package, supporting a wide 3.15V to 5.25V supply. Finding a direct replacement requires careful review of supply voltage and data rate.

AI replacement insight

Electrical riskhigh

Supply voltage range mismatch is a critical failure point.

Package risklow

Candidates share the same DIP8 package.

Firmware risklow

No firmware changes expected for a transceiver swap.

Sourcing riskmedium

Alternatives are available but may have different supply chains.

Can it be replaced directly?

No direct drop-in replacement was found. Alternatives have narrower supply voltage ranges and lower data rates, requiring design verification.

Best replacement path

TD301D232H for 3.3V systems or TD501D232H for 5V systems, if a lower data rate (115.2kbps) is acceptable.

Main risk

The primary risk is supply voltage incompatibility. The target supports both 3.3V and 5V logic, while alternatives are typically fixed to one.

Recommended alternatives

A functional alternative for 5V systems, but with a lower data rate. Not compatible with 3.3V systems.

View details

Alternative comparison matrix

Feature / factor	RSM232	TD501D232H	TD301D232H	Compatibility / risk
Package	DIP8	DIP8	DIP8	DIP8 — Package matches.; TD301D232H: Package matches.
Voltage	3.15V to 5.25V	4.75V to 5.25V	3.15V to 3.45V	4.75V to 5.25V / 3.15V to 3.45V — Narrower supply range, 5V only. Target supports 3.3V and 5V.; TD301D232H: Narrower supply range, 3.3V only. Target supports 3.3V and 5V.
Data Rate	235kbps	115.2kbps	115.2kbps	115.2kbps — Slower data rate.; TD301D232H: Slower data rate.
Current	30mA	35mA	50mA	35mA / 50mA — Slightly higher quiescent current.; TD301D232H: Higher quiescent current.
Interface	RS-232	RS-232	RS-232	RS-232 — Interface protocol matches.; TD301D232H: Interface protocol matches.

Application & sourcing insights

Questions & answers

The best alternative depends on your system's supply voltage. For 3.3V systems, consider TD301D232H. For 5V systems, TD501D232H is an option. Both have a lower data rate (115.2kbps vs 235kbps), which must be verified for your application.