Is there a pin-compatible replacement for B1603S?

No pin-compatible replacement is proven because no candidate pinout evidence was checked.

What risks should I check before replacing B1603S?

Check pinout, footprint, OCL with bias, insertion loss, return loss, DCR and isolation rating.

B1603S Alternatives, Datasheet & Cross Reference | CND-tek

B1603S alternatives should be selected from 10/100 Ethernet magnetics with 350uH OCL and 1500Vrms isolation. Pinout is not verified here, so review is required.

AI replacement insight

Electrical riskmedium

return loss and DCR gaps remain

Package riskmedium

SMD and pins are not full footprint proof

Firmware risklow

passive LAN magnetics only

Sourcing riskmedium

candidate lifecycle is unclear

Can it be replaced directly?

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

Best replacement path

Review KMS-1102NL first, then verify B1603S pinout, footprint, return loss and DCR.

Main risk

Pinout and LAN magnetics AC specs are not fully checked.

Recommended alternatives

KMS-1102NL is the closest listed 10/100 Ethernet transformer candidate for B1603S.

View details

Alternative comparison matrix

Feature / factor	B1603S	KMS-1102NL	HX2326NL	HX2019NLT	Compatibility / risk
Package	SMD,16 pin	SMD,16 pin	SMD,16 pin	SMD,pins missing	SMD,16 pin / SMD,pins missing — mount class matches; HX2326NL: generic match only; HX2019NLT: pin count absent
Pinout	B1603S pins	not checked	not checked	not checked	not checked — no pin map evidence; HX2326NL: no pin map evidence; HX2019NLT: no pin map evidence
Interface	1CT:1CT,350uH	1CT:1CT,350uH	350uH, ratio missing	IL -1.4dB max	1CT:1CT,350uH / 350uH, ratio missing / IL -1.4dB max — LAN magnetics match; HX2326NL: ratio not indexed; HX2019NLT: loss is worse
Voltage	1500Vrms	1500Vrms	1500Vrms	1500Vrms	1500Vrms — isolation matches; HX2326NL: isolation matches; HX2019NLT: isolation matches
Resistance	DCR 1.2ohm max	missing	-	-	missing — DCR not indexed
Application	10/100 Ethernet	-	100Base-TX PoE+	10/100BASE-TX PoE	100Base-TX PoE+ / 10/100BASE-TX PoE — same LAN class; HX2019NLT: same LAN class

Application & sourcing insights

Questions & answers

KMS-1102NL is the closest candidate in the provided data, but pinout and AC specs need review.