ProjectsPricingInsights

Best Alternatives to EL357C

Package: SOP-4GOODWORKPhotovoltaic OutputLoad Voltage: 35VRise time: 4us@2mA,100ΩIsolation Voltage(rms): 5kVOutput Current: 50mAFall time: 3us@2mA,100Ω

EL357C is a SOP-4 phototransistor optocoupler. GX357NC is the closest catalog candidate, pending pinout review.

AI replacement insight

Electrical riskmedium

CTR, speed, and input type may differ.

Package riskmedium

SOP-4 matches, pinout not shown.

Firmware risklow

No firmware interface.

Sourcing riskmedium

Lifecycle varies by candidate.

Can it be replaced directly?

No pin-compatible replacement is verified from the provided evidence.

Best replacement path

Start with GX357NC, then confirm pinout, input current, CTR, and agency ratings.

Main risk

Pinout and optocoupler bin details are not fully verified.

Recommended alternatives

3
GX357NC package
GX357NC

GUOXIN JIAPIN SEMICONDUCTOR

Needs validationmedium risk

GX357NC closely matches EL357C electrical ratings in SOP-4.

View details

Alternative comparison matrix

Feature / factorEL357CGX357NCCT521-1GB(SL)(T1)KPC354NT0BCompatibility / risk
PackageSOP-4, 4 pinSOP-4, 4 pinSOP-4, 4 pinSOP-4, 4 pinSOP-4, 4 pin — same catalog package; CT521-1GB(SL)(T1): same catalog package; KPC354NT0B: same catalog package
Voltage3750Vrms, 80V VCEO3750Vrms, 80V VCEO5300Vrms, 80V3750Vrms, 80V3750Vrms, 80V VCEO / 5300Vrms, 80V — isolation and VCEO match; CT521-1GB(SL)(T1): higher isolation; KPC354NT0B: ratings align
CurrentCTR 200-400%CTR 200-400%CTR 100-600%CTR 20-400%CTR 200-400% / CTR 100-600% / CTR 20-400% — same CTR bin; CT521-1GB(SL)(T1): broader bin; KPC354NT0B: lower min CTR
Temperature-55 to 110C-55 to 110C-55 to 125C-55 to 115C-55 to 110C / -55 to 125C / -55 to 115C — range matches; CT521-1GB(SL)(T1): wider range; KPC354NT0B: slightly wider
Pinoutnot shownnot shown--not shown — needs datasheet check
Application3us/4us-16us/16us-16us/16us — much slower
InterfaceDC input--AC inputAC input — input differs

Application & sourcing insights

Questions & answers

GX357NC is the closest candidate in the provided catalog data, but it still needs pinout review.