NCP1117DT33RKG
onsemi
Needs validationlow risk
Strong alternative from the 1117 family with matching key electricals and compatible package.
Best Alternatives to LM1117RS-3.3
Finding a replacement for the LM1117RS-3.3 3.3V LDO involves matching the TO-252 package, 1A output current, and 20V maximum input voltage. Several alternatives from the popular 1117 family exist, offering strong compatibility.
AI replacement insight
Electrical riskmedium
Some alternatives have lower max input voltage. Verify your system's voltage does not exceed the substitute's rating.
Package risklow
Pinout for the 1117 family is standard but should always be confirmed against the datasheet to avoid errors.
Sourcing risklow
The 1117 family is widely available from multiple manufacturers, reducing sourcing risk.
Can it be replaced directly?
Direct replacement for LM1117RS-3.3 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
NCP1117DT33RKG from onsemi is the strongest direct replacement candidate, with NCV1117DT33T5G as an automotive-grade upgrade.
Main risk
The primary risk is using a substitute with a lower maximum input voltage than the target's 20V, which could damage the component.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | LM1117RS-3.3 | NCP1117DT33RKG | NCV1117DT33T5G | BL8072COTR33 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | TO-252 | DPAK | DPAK | TO-252 | DPAK / TO-252 / TO-252 (DPAK) — DPAK is a JEDEC standard for TO-252, considered compatible.; NCV1117DT33T5G: DPAK is compatible with TO-252.; BL8072COTR33: Package is a direct match.; AMS1117CD-3.3: Package is a direct match. |
| Voltage | 20V | 20V | 20V | 850mV | 20V / 850mV / 1.3V — Maximum input voltage is identical.; NCV1117DT33T5G: Maximum input voltage is identical.; BL8072COTR33: Dropout voltage is better.; AMS1117CD-3.3: Dropout voltage is slightly higher. |
| Current | 1.0A | 1.0A | 1.0A | 2.0A | 1.0A / 2.0A — Output current rating is identical.; NCV1117DT33T5G: Output current rating is identical.; BL8072COTR33: Output current is higher, which is an upgrade.; AMS1117CD-3.3: Output current is identical. |
| Temperature | -40°C to 125°C | 0°C to +125°C | - | - | 0°C to +125°C — Operating range start is higher, check application requirements. |
| Application | Commercial | - | AEC-Q100 | - | AEC-Q100 — Automotive grade offers higher reliability. |
Application & sourcing insights
Questions & answers
Verified drop-in options for LM1117RS-3.3 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.