
ROHM
Form-fit compatible with higher voltage and current ratings, but has a higher forward voltage.
RB161M-20TR is a 20V, 1A Schottky diode in a SOD-123 package from ROHM, now marked as NRND. Alternatives exist within the ROHM family, but require checking the impact of a higher forward voltage on efficiency.
Higher forward voltage (Vf) in all candidates will increase power loss and heat. Must be verified.
Candidates share the same SOD-123 package, ensuring form-fit compatibility.
The target and all close alternatives are marked NRND, indicating potential long-term supply issues.
No direct drop-in replacement is confirmed. Several ROHM parts like RB160M-30TR are form-fit compatible but have a higher forward voltage, requiring design review.
Consider ROHM's RB060M-30TR for higher voltage/current ratings, but verify the impact of its higher forward voltage.
The primary risk is increased power dissipation and reduced efficiency due to higher forward voltage in all viable alternatives.

ROHM
Form-fit compatible with higher voltage and current ratings, but has a higher forward voltage.
| Feature / factor | RB161M-20TR | RB060M-30TR | RB160M-30TR | RB160M-60TR | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOD-123 | SOD-123 (PMDU) | SOD-123 | SOD-123 | SOD-123 (PMDU) — Package is a form-fit match.; RB160M-30TR: Package is a form-fit match.; RB160M-60TR: Package is a form-fit match. |
| Voltage | 20V | 30V | 30V | 60V | 30V / 60V — Higher reverse voltage provides more margin.; RB160M-30TR: Higher reverse voltage provides more design margin.; RB160M-60TR: Higher reverse voltage provides more design margin. |
| Current | 1A | 2A | 1A | 1A | 2A / 1A — Higher forward current provides more margin.; RB160M-30TR: Forward current rating is identical.; RB160M-60TR: Forward current rating is identical. |
| Forward Voltage | 0.35V | ~0.49V | 0.48V | 0.55V | ~0.49V / 0.48V / 0.55V — Higher Vf increases power dissipation.; RB160M-30TR: Higher Vf increases power dissipation.; RB160M-60TR: Higher Vf increases power dissipation. |
| Lifecycle | NRND | - | - | NRND | NRND — Both parts are not recommended for new designs. |
ROHM's RB060M-30TR offers higher voltage (30V) and current (2A) ratings in the same package, but its forward voltage is higher. For similar ratings, consider RB160M-30TR. Both require review.