CJT1117B-5.0
Jiangsu Changjing Electronics Technology Co., Ltd.
Needs validationmedium risk
A strong, pin-compatible alternative in the SOT-223 package, but with a lower maximum input voltage of 15V.
Best Alternatives to LD1117-5.0
The LD1117-5.0 is a popular 5V, 1A low-dropout (LDO) regulator in multiple SMD packages. When finding a replacement, key factors include matching the package (TO-252, SOT-223, or SOT-89), verifying the pinout, and ensuring electrical ratings meet application needs.
AI replacement insight
Package riskmedium
Multiple target packages exist, and candidates have different footprints.
Electrical riskmedium
Some candidates have lower voltage ratings that must be verified.
Firmware risklow
These are simple analog regulators with no firmware.
Can it be replaced directly?
No universal drop-in replacement exists across all packages. The CJT1117B-5.0 is pin-compatible for the SOT-223 version but has a lower voltage rating. Other candidates require board layout changes.
Best replacement path
For SOT-223 users, CJT1117B-5.0 is a near drop-in if the 15V max input is acceptable. For other packages, a PCB redesign is likely required as common alternatives have different pinouts.
Main risk
The primary risk is pinout incompatibility. Many 5V regulators in similar packages (like the 7805 series) have a different pin configuration than the 1117 series, which will damage the part or circuit if not corrected.
Recommended alternatives
6Alternative comparison matrix
| Feature / factor | LD1117-5.0 | CJT1117B-5.0 | CJ7805 3% | L7805CDT-TR | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-223 | SOT-223 | - | - | DPAK (TO-252) — Package form is a match. |
| Output Voltage V | 5.0V | 5.0V | - | - | 5.0V — matched |
| Output Current A | 1.0A | 1.0A | - | - | 1.5A — Higher current capability. |
| Input Voltage V | 18V | 15V | - | - | 35V — Higher input voltage tolerance. |
| Pinout | 1117 series | - | Different (78xx series) | - | Different (78xx series) — Pinout (IN,GND,OUT) differs from target's 1117 pinout (GND,OUT,IN). |
Application & sourcing insights
Questions & answers
The best alternative depends on your specific package and voltage needs. The CJT1117B-5.0 is a strong candidate in the SOT-223 package if your input voltage is 15V or less. For the TO-252 package, several 7805-series parts are functional matches but require PCB layout changes due to a different pinout.