FOD814AW Equivalent & Substitute Parts

Part Overview

The FOD814AW is a 5000Vrms optoisolator with transistor output in 4-DIP packaging, manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The FOD814AW provides single-channel isolation suitable for AC and DC input applications with 50mA output current capability and 70V maximum output voltage.

Key Parameters

Parameter	FOD814AW Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 1mA
Current Transfer Ratio (Max)	150% @ 1mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Input Type	AC, DC
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	50mA
Vce Saturation (Max)	200mV
Rise / Fall Time (Typ)	4µs, 3µs
Operating Temperature	-55°C ~ 105°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)

Substitute Part Grouping Explanation

Substitution for the FOD814AW is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms required
Output Type: Transistor output only
Number of Channels: Single channel
Package: 4-DIP form factor
Input Type: AC and DC compatible
Output Voltage Rating: Minimum 70V
Output Current: Minimum 50mA per channel
Operating Temperature Range: Must encompass or overlap -55°C to 105°C
Mounting: Through-hole configuration

Substitute parts are grouped into two categories:

Category 1 - Direct onsemi Equivalents: FOD814A300W maintains identical electrical specifications with active product status and improved compliance documentation.

Category 2 - Cross-Manufacturer Alternatives: Vishay SFH620A series (SFH620A-1, SFH620A-2, SFH620A-3, SFH620A-2X016, SFH620A-3X016) and Lite-On LTV-814HM provide equivalent isolation voltage and output characteristics with active status. Isocom SFH620A-1G, SFH620A-2G, and SFH620A-3G variants offer similar functionality with alternative isolation voltage specifications.

Parameter Comparison

Parameter	FOD814AW	FOD814A300W	LTV-814HM	SFH620A-1	SFH620A-2	SFH620A-3	SFH620A-2X016	SFH620A-3X016
Manufacturer	onsemi	onsemi	Lite-On Inc.	Vishay	Vishay	Vishay	Vishay	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Number of Channels	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	50% @ 1mA	50% @ 1mA	20% @ 100mA	40% @ 10mA	63% @ 10mA	100% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	150% @ 1mA	150% @ 1mA	80% @ 100mA	125% @ 10mA	200% @ 10mA	320% @ 10mA	200% @ 10mA	320% @ 10mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	70V	35V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	80mA	50mA	50mA	50mA	50mA	50mA
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.4V	1.25V	1.25V	1.25V	1.25V	1.25V
Current - DC Forward (If) (Max)	50mA	50mA	150mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	200mV	200mV	200mV	400mV	400mV	400mV	400mV	400mV
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	2µs, 2µs	2µs, 2µs	2µs, 2µs	2µs, 2µs	2µs, 2µs
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-30°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	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: FOD814A300W

FOD814A300W is the direct successor to FOD814AW, manufactured by onsemi with identical electrical specifications. This part maintains 5000Vrms isolation, 50% to 150% current transfer ratio at 1mA, and 4-DIP (0.400", 10.16mm) package compatibility. FOD814A300W carries active product status and ROHS3 compliance certification, providing superior long-term availability and regulatory support compared to the obsolete FOD814AW.

Secondary Recommendations: Vishay SFH620A Series

SFH620A-2X016 and SFH620A-3X016 provide direct package compatibility with FOD814AW (4-DIP 0.400", 10.16mm) and exceed isolation voltage specifications at 5300Vrms. Both parts maintain 70V maximum output voltage and 50mA output current. SFH620A-2X016 offers 63% to 200% current transfer ratio, while SFH620A-3X016 provides 100% to 320% current transfer ratio. Both are ROHS3 compliant with active status.

SFH620A-1, SFH620A-2, and SFH620A-3 use smaller 4-DIP (0.300", 7.62mm) packaging and require PCB layout modification but deliver faster rise/fall times (2µs, 2µs) compared to FOD814AW (4µs, 3µs).

Alternative: Lite-On LTV-814HM

LTV-814HM maintains 5000Vrms isolation and 4-DIP (0.400", 10.16mm) package compatibility. This part supports higher output current (80mA) and forward current (150mA) but operates within -30°C to 100°C temperature range, which does not fully cover the FOD814AW upper temperature limit of 105°C. LTV-814HM is suitable for applications not requiring extended high-temperature operation.

Frequently Asked Questions (FAQ)

Q: Can FOD814A300W directly replace FOD814AW without PCB modifications?

A: Yes. FOD814A300W maintains identical electrical specifications, isolation voltage (5000Vrms), output voltage (70V), output current (50mA), and 4-DIP (0.400", 10.16mm) package dimensions. No PCB layout changes are required.

Q: What is the key difference between SFH620A-2X016 and SFH620A-3X016?

A: Both parts use identical 4-DIP (0.400", 10.16mm) packaging compatible with FOD814AW. The primary difference is current transfer ratio: SFH620A-2X016 ranges from 63% to 200% at 10mA, while SFH620A-3X016 ranges from 100% to 320% at 10mA. SFH620A-3X016 provides higher gain and faster response characteristics.

Q: Why do SFH620A-1, SFH620A-2, and SFH620A-3 use different package dimensions?

A: These Vishay parts use 4-DIP (0.300", 7.62mm) packaging, which is physically smaller than the FOD814AW 4-DIP (0.400", 10.16mm) package. While electrically compatible, PCB footprint modification is required. The smaller package enables higher circuit density but demands layout redesign.

Q: Is LTV-814HM suitable for applications requiring -55°C operation?

A: No. LTV-814HM operates from -30°C to 100°C, which does not cover the FOD814AW lower temperature limit of -55°C. Applications requiring extended low-temperature operation must use FOD814A300W, SFH620A series, or equivalent parts with -55°C minimum rating.

Q: What compliance certifications should I verify for new designs?

A: All recommended substitute parts carry ROHS3 compliance and REACH Unaffected status. FOD814A300W and Vishay SFH620A series provide complete regulatory documentation suitable for production environments. Verify specific certifications against your application requirements before final component selection.

Q: Can I use parts with higher current transfer ratio specifications?

A: Yes, provided your circuit design accommodates the increased gain. SFH620A-3 and SFH620A-3X016 deliver 100% to 320% current transfer ratio compared to FOD814AW's 50% to 150%. Higher gain may require input current adjustment to maintain proper output switching characteristics.

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