FOD814W Equivalent & Substitute Parts

Part Overview

The FOD814W is an optoisolator with transistor output manufactured by onsemi, rated for 5000Vrms isolation voltage in a 4-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The FOD814W provides single-channel isolation with 1 channel, 50mA output current capability, and operates across the temperature range of -55°C to 105°C. Substitute parts must maintain compatibility with the 4-DIP through-hole mounting and preserve the core isolation and switching characteristics required for the application.

Key Parameters

Parameter	FOD814W Value
Manufacturer	onsemi
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	20% @ 1mA
Current Transfer Ratio (Max)	300% @ 1mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	200mV
Operating Temperature	-55°C ~ 105°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)
Input Type	AC, DC
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the FOD814W is determined by the following critical parameters:

Primary Compatibility Criteria:

Single channel configuration (Number of Channels = 1)
Transistor output type
4-DIP through-hole package
Isolation voltage rating of 5000Vrms or higher
Maximum output voltage of 70V or higher
Output current capability of 50mA or higher
AC/DC input capability
Operating temperature range that encompasses or exceeds -55°C to 105°C

Substitute Categories:

Parametric Equivalent (Direct Replacement): FOD814300W from onsemi maintains identical electrical specifications and package configuration. This part is active and RoHS3 compliant, differing only in product status and packaging format (Tube vs. unspecified for FOD814W).

Similar Substitutes (Functional Equivalents): Parts from Vishay Semiconductor Opto Division (SFH620A series) and Lite-On Inc. (LTV-814HM) meet the core isolation voltage, output type, and package requirements. These parts operate within compatible parameter ranges for isolation voltage (5300Vrms or 5000Vrms), output voltage (70V), and output current (50mA or 80mA). Isocom Components 2004 LTD variants (SFH620A-xG series) provide functional equivalence with different isolation voltage specifications (7.5Vpk) and temperature ranges.

Parameter Comparison

Parameter	FOD814W	FOD814300W	LTV-814HM	SFH620A-1	SFH620A-2	SFH620A-3	SFH620A-2X016	SFH620A-3X016
Manufacturer	onsemi	onsemi	Lite-On Inc.	Vishay	Vishay	Vishay	Vishay	Vishay
Number of Channels	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	20% @ 1mA	20% @ 1mA	20% @ 100mA	40% @ 10mA	63% @ 10mA	100% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	300% @ 1mA	300% @ 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
Vce Saturation (Max)	200mV	200mV	200mV	400mV	400mV	400mV	400mV	400mV
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)
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FOD814300W (onsemi): This is the direct parametric equivalent and primary recommendation. It maintains all electrical specifications of the FOD814W while offering active product status and ROHS3 compliance. The part is available in high inventory (80,100 pcs) and requires no design modifications.

SFH620A-2X016 and SFH620A-3X016 (Vishay Semiconductor Opto Division): These parts provide functional equivalence with 5300Vrms isolation voltage, matching the 4-DIP (0.400", 10.16mm) package footprint of the FOD814W. Both are ROHS3 compliant and active. SFH620A-3X016 offers higher current transfer ratio (100% min @ 10mA) compared to SFH620A-2X016 (63% min @ 10mA), providing design flexibility. Vce saturation is higher at 400mV versus 200mV for the FOD814W, which may impact switching speed in low-voltage applications.

SFH620A-1, SFH620A-2, SFH620A-3 (Vishay Semiconductor Opto Division): These variants use the smaller 4-DIP (0.300", 7.62mm) package, requiring PCB layout modifications. They maintain 5300Vrms isolation and 70V output voltage ratings. Selection among these three depends on required current transfer ratio: SFH620A-1 (40% min), SFH620A-2 (63% min), or SFH620A-3 (100% min).

LTV-814HM (Lite-On Inc.): This part meets core isolation and package requirements but has reduced maximum output voltage (35V vs. 70V) and different current transfer ratio specifications (20% min @ 100mA vs. 20% min @ 1mA). Operating temperature range is narrower (-30°C to 100°C). Use only when output voltage and temperature requirements are compatible.

Isocom Components 2004 LTD variants (SFH620A-1G, SFH620A-2G, SFH620A-3G): These parts feature different isolation voltage specification (7.5Vpk) and narrower operating temperature range (-30°C to 100°C). They are suitable only for applications where the lower isolation voltage and temperature range are acceptable.

Frequently Asked Questions (FAQ)

Q: Can FOD814300W be used as a direct replacement for FOD814W?

A: Yes. FOD814300W is the parametric equivalent with identical electrical specifications, isolation voltage (5000Vrms), output voltage (70V), output current (50mA), and package configuration (4-DIP 0.400"). The only differences are product status (active vs. obsolete) and packaging format (Tube). No design changes are required.

Q: What is the key difference between SFH620A-1, SFH620A-2, and SFH620A-3?

A: The primary difference is current transfer ratio. SFH620A-1 specifies 40% minimum @ 10mA, SFH620A-2 specifies 63% minimum @ 10mA, and SFH620A-3 specifies 100% minimum @ 10mA. All three maintain 5300Vrms isolation and 70V output voltage. Higher current transfer ratio provides better switching performance at lower input currents. Selection depends on input drive capability and switching speed requirements.

Q: Why do SFH620A-1, SFH620A-2, and SFH620A-3 have a smaller package (0.300" vs. 0.400")?

A: The 4-DIP (0.300", 7.62mm) package is a narrower variant of the standard 4-DIP footprint. While the pin count and spacing remain compatible with 4-DIP sockets, the reduced body width requires PCB layout verification. Existing through-hole designs may require minor modifications to accommodate the narrower package body.

Q: Can LTV-814HM replace FOD814W in all applications?

A: LTV-814HM is not a universal replacement. While it maintains 5000Vrms isolation and 4-DIP package compatibility, it has reduced maximum output voltage (35V vs. 70V) and narrower operating temperature range (-30°C to 100°C vs. -55°C to 105°C). Use LTV-814HM only when application requirements are within these reduced specifications.

Q: What is the significance of the Vce saturation difference (200mV vs. 400mV)?

A: Vce saturation affects transistor switching characteristics and power dissipation. The FOD814W and FOD814300W specify 200mV maximum saturation voltage, while Vishay SFH620A series parts specify 400mV. Higher saturation voltage results in increased power dissipation during the on-state and may affect switching speed in low-voltage applications. Verify saturation voltage compatibility with circuit design requirements.

Q: Are all substitute parts RoHS3 compliant?

A: FOD814300W and all Vishay Semiconductor Opto Division parts (SFH620A series) are explicitly RoHS3 compliant. LTV-814HM and Isocom Components 2004 LTD variants do not specify RoHS status in the provided data. Verify RoHS compliance requirements with your procurement or regulatory team before final selection.

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

A: SFH620A-2X016 uses the larger 4-DIP (0.400", 10.16mm) package matching the FOD814W footprint, while SFH620A-2 uses the smaller 4-DIP (0.300", 7.62mm) package. Both maintain identical electrical specifications (5300Vrms isolation, 63% min current transfer ratio @ 10mA, 70V output). SFH620A-2X016 is the preferred choice for direct PCB replacement without layout modifications.

Q: Can Isocom Components 2004 LTD parts (SFH620A-xG) be used as substitutes?

A: Isocom parts are functionally compatible for 4-DIP through-hole mounting and AC/DC input capability. However, they specify different isolation voltage (7.5Vpk vs. 5000Vrms) and narrower operating temperature range (-30°C to 100°C). Use these parts only when isolation voltage and temperature specifications are compatible with application requirements.

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