SFH620AA Equivalent & Substitute Parts

Part Overview

The SFH620AA is a single-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation voltage and is designed for AC/DC input applications requiring galvanic isolation in 4-DIP through-hole packages. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent parts are identified based on matching isolation voltage class, output type, package configuration, and electrical performance parameters within acceptable operating ranges.

Key Parameters

Parameter	SFH620AA
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Output Type	Transistor
Input Type	AC, DC
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 100°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SFH620AA is determined by the following critical parameters:

Isolation Voltage Class: Minimum 5000Vrms (SFH620AA operates at 5300Vrms; substitutes at 5000Vrms are acceptable as they meet the isolation requirement)
Output Configuration: Transistor output type required
Package Format: 4-DIP through-hole package with 0.300" (7.62mm) pitch
Input Capability: AC/DC input support
Channel Count: Single channel
Electrical Compatibility: Maximum output voltage 70V, output current 50mA, and saturation voltage within specified limits

The FOD814 and FOD814A from onsemi meet these substitution criteria. Both parts operate at 5000Vrms isolation voltage, feature transistor outputs in identical 4-DIP packages, support AC/DC inputs, and maintain compatible electrical performance within the application envelope.

Parameter Comparison

Parameter	SFH620AA	FOD814	FOD814A
Manufacturer	Vishay	onsemi	onsemi
Number of Channels	1	1	1
Voltage - Isolation	5300Vrms	5000Vrms	5000Vrms
Output Type	Transistor	Transistor	Transistor
Input Type	AC, DC	AC, DC	AC, DC
Voltage - Output (Max)	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA
Vce Saturation (Max)	400mV	200mV	200mV
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	1.2V
Operating Temperature	-55°C ~ 100°C	-55°C ~ 105°C	-55°C ~ 105°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both FOD814 and FOD814A are qualified substitutes for the SFH620AA based on product status and compliance certifications. All three parts maintain active production status and ROHS3 compliance. The FOD814 and FOD814A operate within the same isolation voltage class (5000Vrms vs. 5300Vrms) and share identical package, mounting, and output specifications.

Selection between FOD814 and FOD814A depends on current transfer ratio requirements. The FOD814 provides 20% minimum CTR at 1mA, while FOD814A provides 50% minimum CTR at 1mA. The SFH620AA specifies 50% minimum CTR at 5mA. Applications requiring higher current transfer ratio performance at lower input currents should specify FOD814A. Both substitutes feature improved saturation voltage (200mV vs. 400mV) and extended operating temperature range (-55°C to 105°C vs. -55°C to 100°C).

Frequently Asked Questions (FAQ)

Q: Can FOD814 or FOD814A be used as direct pin-for-pin replacements for SFH620AA?

A: Yes. Both FOD814 and FOD814A are pin-compatible with SFH620AA in 4-DIP through-hole packages. Pinout and electrical interface are identical, enabling direct board-level substitution without circuit modification.

Q: What is the difference between FOD814 and FOD814A?

A: The primary difference is current transfer ratio specification. FOD814A guarantees 50% minimum CTR at 1mA input current, matching the SFH620AA's 50% minimum specification. FOD814 provides 20% minimum CTR at 1mA. For applications sensitive to CTR performance at low input currents, FOD814A is the preferred substitute.

Q: Is the 300Vrms isolation voltage difference between SFH620AA (5300Vrms) and FOD814/FOD814A (5000Vrms) significant?

A: Both parts operate within the same isolation voltage class. The 300Vrms difference does not affect substitution validity for applications designed for 5000Vrms minimum isolation. System-level isolation requirements determine acceptability.

Q: Do the substitute parts have better performance characteristics?

A: FOD814 and FOD814A feature lower saturation voltage (200mV vs. 400mV) and extended operating temperature range to 105°C. These represent performance improvements over SFH620AA within the same functional category.

Q: Are all three parts ROHS3 compliant?

A: Yes. SFH620AA, FOD814, and FOD814A all carry ROHS3 compliance certification and are suitable for applications with environmental compliance requirements.

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