High isolation voltage optocoupler MSKSEMI MEL357B designed for compact electronic devices and industrial control

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Product Description

Product Overview

The MEL357X is a compact surface-mount optocoupler designed for high-density applications. It comprises a gallium arsenide light-emitting diode and a phototransistor, offering superior miniaturization compared to DIP packages. Ideal for programmable controllers and various electronic devices, it provides excellent current transfer ratio (CTR) and high input-output isolation voltage.

Product Attributes

Brand: Msksemi
Product Line: MEL357X
Packaging: SOP-4

Technical Specifications

Model	Package	Minimum Packaging	Current Transfer Ratio (CTR) Range (IF=5mA, VCE=5V)	Input-Output Isolation Voltage (Viso)	Collector-Emitter Breakdown Voltage (BVCEO)
MEL357X	SOP-4	3000	50~600%	3750 Vrms	80V

Application Fields

Switching power supplies, smart meters
Industrial control, measuring instruments
Office equipment (e.g., copiers)
Home appliances (e.g., air conditioners, fans, water heaters)

Electrical Characteristics (Ta=25)

Parameter	Symbol	Condition	Min.	Typ.	Max.	Unit
Input	Forward Voltage (VF)	IF=20mA	1.2	1.4	-	V
	Reverse Current (IR)	VR=5V	-	-	10	A
	Terminal Capacitance (Ct)	V=0, f=1kHz	-	30	250	pF
Output	Collector Dark Current (ICEO)	VCE=70V	-	-	100	nA
	Collector-Emitter Breakdown Voltage (BVCEO)	IC=0.1mA, IF=0	80	-	-	V
	Emitter-Collector Breakdown Voltage (BVECO)	IE=0.1mA, IF=0	7	-	-	V
	Collector Power Dissipation (PC)	-	-	-	150	mW
Transfer Characteristics	Current Transfer Ratio (CTR)	IF=5mA, VCE=5V	50	-	400	%
	Collector-Emitter Saturation Voltage (VCE(sat))	IF=20mA, IC=1mA	-	0.1	0.2	V
	Isolation Resistance (RISO)	DC1000V, 40~60%R.H.	1x10¹¹	-	-
	Isolation Capacitance (Cf)	V=0, f=1MHz	-	0.6	1.0	pF
Cut-off Frequency (Fc)	VCE=5V, IC=2mA, RL=100, -3dB	-	80	-	kHz
Switching Time	Rise Time (Tr)	VCE=10V, IC=2mA, RL=100	-	4	18	s
Switching Time	Fall Time (Tf)	-	-	3	18	s

Absolute Maximum Ratings (Ta=25)

Parameter	Symbol	Rating	Unit
Input	Forward Current (IF)	50	mA
	Forward Pulse Current (IFP)	1	A
	Reverse Voltage (VR)	6	V
	Power Dissipation (P)	70	mW
Output	Collector Power Dissipation (PC)	150	mW
	Collector Current (IC)	50	mA
	Collector-Emitter Voltage (VCEO)	80	V
Total Power Dissipation (Ptot)	-	200	mW
Isolation Voltage (Viso)	-	3750 Vrms	-
Operating Temperature (Topr)	-	-55~+110
Storage Temperature (Tstg)	-	-55~+125
Soldering Temperature (Tsol)	-	260

CTR Grading Table

Model	Body Mark	Grading Standard	IC(mA)	CTR (%) Min	CTR (%) Max
MEL357	Blank	IF=5mA, VCE=5V, Ta=25C	2.5	50	600
MEL357A	A	IF=5mA, VCE=5V, Ta=25C	4.0	80	160
MEL357B	B	IF=5mA, VCE=5V, Ta=25C	6.5	130	260
MEL357C	C	IF=5mA, VCE=5V, Ta=25C	10.0	200	400
MEL357D	D	IF=5mA, VCE=5V, Ta=25C	15.0	300	600