SFH615AY-X019T Equivalent & Substitute Parts

Part Overview

The SFH615AY-X019T is an optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This surface mount device provides 5300Vrms isolation in a 4-SMD gull wing package and is designed for applications requiring galvanic isolation with DC input and transistor output configuration. The part is active and in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when surface mount tape and reel packaging is unavailable, when alternative current transfer ratio grades are required for specific circuit performance, or when through-hole mounting is preferred for prototype or legacy system applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SFH615AY-X019T
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Packaging	Tape & Reel (TR)
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the SFH615AY-X019T is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - Isolation: 5300Vrms (or equivalent)
Number of Channels: 1
Output Type: Transistor
Voltage - Output (Max): 70V
Current - Output / Channel: 50mA
Vce Saturation (Max): 400mV
Input Type: DC
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Current Transfer Ratio: May vary within device grades (50%-320% range across substitute options)
Packaging: Surface mount tape & reel or through-hole tube acceptable
Mounting Type: Surface mount or through-hole
Operating Temperature: May be narrower range (-30°C ~ 100°C acceptable for -55°C ~ 100°C requirement)
Turn On / Turn Off Time: Variation acceptable within specified ranges
Voltage - Forward (Vf): Variation acceptable (1.25V to 1.65V)
Current - DC Forward (If): May be 50mA or 60mA

The substitute parts listed maintain electrical compatibility through identical isolation voltage, output voltage rating, output current capability, and saturation voltage specifications. Current transfer ratio grades allow selection based on circuit gain requirements.

Parameter Comparison

Parameter	SFH615AY-X019T	SFH615A-2	SFH615A-2XSMT&R	SFH615A-3XSMT&R	SFH615A-4XSMT&R	SFH617A-3XSMT&R
Manufacturer	Vishay	Vishay	Isocom	Isocom	Isocom	Isocom
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	7.5Vpk
Number of Channels	1	1	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	63% @ 10mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	150% @ 5mA	125% @ 10mA	125% @ 10mA	200% @ 10mA	320% @ 10mA	200% @ 10mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Mounting Type	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-DIP (0.300", 7.62mm)	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

SFH615A-2: Direct substitute for through-hole applications. Maintains identical isolation voltage and output specifications. Suitable when PCB design requires through-hole mounting or when surface mount assembly is unavailable. Manufactured by Vishay with ROHS3 compliance and active product status.

SFH615A-2XSMT&R: Surface mount alternative with identical package footprint to SFH615AY-X019T. Manufactured by Isocom with ROHS3 compliance. Operating temperature range is -30°C to 100°C, which is narrower than the original part. Suitable for applications not requiring extended low-temperature operation below -30°C.

SFH615A-3XSMT&R: Surface mount option with higher current transfer ratio (100%-200% @ 10mA). Manufactured by Isocom with ROHS3 compliance. Provides increased gain for circuits requiring higher output current drive capability. Operating temperature range is -30°C to 100°C.

SFH615A-4XSMT&R: Surface mount option with highest current transfer ratio (160%-320% @ 10mA). Manufactured by Isocom with ROHS3 compliance. Suitable for applications requiring maximum output current drive. Operating temperature range is -30°C to 100°C.

SFH617A-3XSMT&R: Not recommended as direct substitute. Isolation voltage specification is 7.5Vpk, which differs from the 5300Vrms requirement of the SFH615AY-X019T. This part is listed in the substitute database but does not meet the mandatory isolation voltage parameter.

All recommended substitutes maintain active product status and ROHS3 compliance. Selection should be based on packaging requirements (surface mount vs. through-hole), current transfer ratio grade needed for circuit performance, and operating temperature range compatibility.

Frequently Asked Questions (FAQ)

Q: Can SFH615A-2 replace SFH615AY-X019T in a surface mount assembly?

A: No. SFH615A-2 is a through-hole 4-DIP package device, while SFH615AY-X019T is surface mount 4-SMD gull wing. PCB layout and assembly process are incompatible. Use SFH615A-2XSMT&R, SFH615A-3XSMT&R, or SFH615A-4XSMT&R for surface mount applications.

Q: What is the difference between the current transfer ratio grades?

A: Current transfer ratio (CTR) determines the output current relative to input current. SFH615A-2XSMT&R provides 63%-125% CTR, SFH615A-3XSMT&R provides 100%-200% CTR, and SFH615A-4XSMT&R provides 160%-320% CTR. Higher CTR grades deliver greater output current drive for the same input current, improving circuit gain and switching speed.

Q: Is SFH617A-3XSMT&R compatible with SFH615AY-X019T?

A: No. SFH617A-3XSMT&R has isolation voltage of 7.5Vpk, which does not meet the 5300Vrms isolation requirement of SFH615AY-X019T. This part is electrically incompatible and must not be used as a substitute.

Q: What is the impact of the narrower operating temperature range in Isocom substitutes?

A: Isocom substitute parts operate from -30°C to 100°C, while SFH615AY-X019T operates from -55°C to 100°C. If the application requires operation below -30°C, Isocom substitutes are not suitable. For applications with minimum operating temperature above -30°C, the narrower range is acceptable.

Q: Can I use SFH615A-2 (through-hole) in a prototype if surface mount parts are unavailable?

A: Yes. SFH615A-2 maintains identical electrical specifications including isolation voltage, output voltage, output current, and saturation voltage. Through-hole mounting is compatible with breadboard prototyping and hand-soldered PCBs. Transition to surface mount substitutes for production assembly.

Q: How do I select between SFH615A-2XSMT&R, SFH615A-3XSMT&R, and SFH615A-4XSMT&R?

A: Selection is based on required current transfer ratio for your circuit. SFH615A-2XSMT&R (63%-125% CTR) is closest to the original part's performance window. SFH615A-3XSMT&R (100%-200% CTR) provides moderate gain increase. SFH615A-4XSMT&R (160%-320% CTR) provides maximum gain for high-speed switching applications. All three maintain identical isolation voltage, output voltage, and output current specifications.

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