Needs validationlow risk
A strong functional alternative with matching key electricals and a potential package match (SOT-89 variant).
Best Alternatives to CJA1117B-5.0
Find the best functional alternatives and replacements for the CJA1117B-5.0, a 5V 1A LDO in a SOT-89-3L package. This guide analyzes key parametric differences to help you select a suitable substitute.
AI replacement insight
Package riskhigh
Most alternatives are in different packages. Pinout must be verified even for potential package matches.
Electrical riskmedium
Some alternatives have significantly higher dropout voltage, which could cause regulation failure in the application.
Sourcing risklow
Many functional alternatives for 5V/1A regulators are widely available from multiple vendors.
Can it be replaced directly?
There is no confirmed direct drop-in replacement for CJA1117B-5.0. However, AMS1117-5.0(XBLW) is a strong candidate if its SOT-89 package variant has a compatible pinout.
Best replacement path
The most promising replacement is AMS1117-5.0(XBLW), which offers a SOT-89 package variant and closely matching electrical specifications. Verification of the specific variant and its pinout is essential.
Main risk
The primary risk is physical incompatibility. Most alternatives are in different packages (e.g., SOT223, TO-252) that require PCB layout changes. For LDOs, dropout voltage is also a critical parameter to verify.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | CJA1117B-5.0 | AMS1117-5.0(XBLW) | LDL1117S50R | CJ78D05 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-89-3L | SOT-89 (variant) | SOT223 | TO-252-2L | SOT-89 (variant) / SOT223 / TO-252-2L / TO-220S — One variant matches target package type, requires confirmation.; LDL1117S50R: Different package requires PCB redesign.; CJ78D05: Different package requires PCB redesign.; L7805CV-HXY: Different package requires PCB redesign. |
| Output Voltage V | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V — matched; LDL1117S50R: matched; CJ78D05: matched; L7805CV-HXY: matched |
| Output Current A | 1.0 A | 1.0 A | 1.2 A | 1.0 A | 1.0 A / 1.2 A — matched; LDL1117S50R: Higher current capability.; CJ78D05: matched; L7805CV-HXY: matched |
| Input Voltage V | 15 V | 15 V | 18 V | 35 V | 15 V / 18 V / 35 V — matched; LDL1117S50R: Higher max input voltage.; CJ78D05: Higher max input voltage.; L7805CV-HXY: Higher max input voltage. |
| Dropout Voltage V | 1.15 V | 1.1 V | 0.35 V | 2.0 V | 1.1 V / 0.35 V / 2.0 V — Slightly better dropout performance.; LDL1117S50R: Significantly better dropout performance.; CJ78D05: Significantly higher dropout voltage.; L7805CV-HXY: Significantly higher dropout voltage. |
| Temperature | 0°C to 125°C | -40°C to 125°C | - | - | -40°C to 125°C — Wider operating range. |
Application & sourcing insights
Questions & answers
The best alternative is likely AMS1117-5.0(XBLW), as it is available in a SOT-89 package and has very similar electrical characteristics. However, you must verify the pinout of the SOT-89 variant before use.