SFH6345-X019 Equivalent & Substitute Parts

Part Overview

The SFH6345-X019 is an optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This 8-SMD surface mount component provides 5300Vrms isolation voltage with a single channel configuration, designed for DC input applications requiring galvanic isolation. The part is currently active in production with 2911 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or application-specific requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	SFH6345-X019
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	19% @ 16mA
Output Type	Transistor
Voltage - Output (Max)	25V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.33V
Current - DC Forward (If) (Max)	25 mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SFH6345-X019 are classified into two categories based on parametric equivalence and manufacturer recommendation status:

Parametric Equivalents (Vishay SFH6345 Series): SFH6345-X007 and SFH6345-X009 are direct parametric equivalents manufactured by Vishay. These parts share identical electrical specifications including 5300Vrms isolation voltage, 19% minimum current transfer ratio at 16mA, 25V maximum output voltage, 8mA output current, 1.33V forward voltage, and 400mV Vce saturation. All three variants operate across -55°C to 100°C and are packaged in 8-SMD Gull Wing configuration. These substitutes are interchangeable at the circuit level.

Manufacturer Recommended Alternatives: 6N135SMT&R and 6N136SMT&R (Isocom Components) and HCPL-4504#300 (Broadcom Limited) are manufacturer-recommended alternatives with comparable but not identical specifications. These parts maintain the same 8-SMD surface mount package, single-channel configuration, and -55°C to 100°C operating temperature range. However, they differ in isolation voltage (5000Vrms for Isocom, 3750Vrms for Broadcom), output type (transistor with base for Isocom variants), and maximum output voltage (20V for Isocom and Broadcom versus 25V for SFH6345-X019).

Key Parameters Determining Substitution:

Isolation voltage rating (5300Vrms, 5000Vrms, or 3750Vrms)
Output type (transistor versus transistor with base)
Maximum output voltage (25V versus 20V)
Current transfer ratio range
Package configuration (8-SMD Gull Wing)
Operating temperature range (-55°C to 100°C)

Parameter Comparison

Parameter	SFH6345-X019	SFH6345-X007	SFH6345-X009	6N135SMT&R	6N136SMT&R	HCPL-4504#300
Manufacturer	Vishay	Vishay	Vishay	Isocom	Isocom	Broadcom
Number of Channels	1	1	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5000Vrms	5000Vrms	3750Vrms
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	19% @ 16mA	7% @ 16mA	19% @ 16mA	25% @ 16mA
Current Transfer Ratio (Max)	—	—	—	50% @ 16mA	50% @ 16mA	60% @ 16mA
Output Type	Transistor	Transistor	Transistor	Transistor with Base	Transistor with Base	Transistor
Voltage - Output (Max)	25V	25V	25V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.33V	1.33V	1.33V	1.45V	1.45V	1.5V
Current - DC Forward (If) (Max)	25 mA	25 mA	25 mA	25 mA	25 mA	25 mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Direct Substitution (Parametric Equivalents): SFH6345-X007 and SFH6345-X009 are direct substitutes for SFH6345-X019. All three parts are manufactured by Vishay, share identical electrical and mechanical specifications, and maintain ROHS3 compliance. These variants can be selected interchangeably without circuit redesign. Current inventory levels are 4646 units for SFH6345-X007 and 2543 units for SFH6345-X009.

Alternative Substitution with Design Considerations: 6N135SMT&R, 6N136SMT&R, and HCPL-4504#300 are manufacturer-recommended alternatives suitable for applications where isolation voltage requirements are less stringent or where output type flexibility exists. The 6N136SMT&R from Isocom matches the minimum current transfer ratio specification (19% @ 16mA) and maintains 5000Vrms isolation, making it the closest alternative among the recommended parts. The HCPL-4504#300 from Broadcom provides the lowest isolation voltage (3750Vrms) and is RoHS non-compliant, limiting its use to legacy or non-regulated applications.

Compliance Considerations: SFH6345-X019, SFH6345-X007, and SFH6345-X009 are ROHS3 compliant. The 6N135SMT&R and 6N136SMT&R are ROHS3 compliant. The HCPL-4504#300 is RoHS non-compliant and should not be selected for applications requiring RoHS certification.

Frequently Asked Questions (FAQ)

Q: Can SFH6345-X007 and SFH6345-X009 be used interchangeably with SFH6345-X019?

A: Yes. All three parts are parametric equivalents with identical electrical specifications, isolation voltage, output characteristics, and package configuration. No circuit modifications are required for substitution.

Q: What are the key differences between the Vishay SFH6345 variants and the Isocom 6N135/6N136 series?

A: The primary differences are isolation voltage (5300Vrms for SFH6345 versus 5000Vrms for Isocom), output type (standard transistor for SFH6345 versus transistor with base for Isocom), and maximum output voltage (25V for SFH6345 versus 20V for Isocom). The 6N135SMT&R has a lower minimum current transfer ratio (7% versus 19%), while 6N136SMT&R matches the 19% specification.

Q: Is the HCPL-4504#300 suitable as a substitute for the SFH6345-X019?

A: The HCPL-4504#300 can function as an alternative in applications where 3750Vrms isolation is sufficient. However, it has lower isolation voltage, lower maximum output voltage (20V versus 25V), and is RoHS non-compliant. It is not recommended for new designs requiring RoHS certification.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use 8-SMD Gull Wing surface mount packaging, ensuring mechanical compatibility with existing PCB layouts designed for the SFH6345-X019.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across the same temperature range: -55°C to 100°C, matching the SFH6345-X019 specification.

Q: Which substitute part has the best current transfer ratio performance?

A: The HCPL-4504#300 has the highest current transfer ratio range (25% to 60% @ 16mA). The 6N136SMT&R matches the SFH6345-X019 minimum specification (19% @ 16mA) with an upper range of 50%. The 6N135SMT&R has the lowest minimum specification (7% @ 16mA).

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