FOD2743CT Equivalent & Substitute Parts

Part Overview

The FOD2743CT is an optoisolator with transistor output manufactured by onsemi, designed for applications requiring galvanic isolation up to 5000Vrms. This component features a single channel configuration in an 8-DIP package and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for ongoing system support, design updates, and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	FOD2743CT
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 1mA
Current Transfer Ratio (Max)	100% @ 1mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.07V
Vce Saturation (Max)	400mV
Operating Temperature	-40°C ~ 85°C
Package / Case	8-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FOD2743CT is determined by strict equivalence across the following critical parameters:

Isolation Voltage: 5000Vrms (primary isolation specification)
Number of Channels: 1 (functional configuration)
Output Type: Transistor (output stage architecture)
Current Transfer Ratio Range: 50% to 100% @ 1mA (optical coupling efficiency)
Maximum Output Voltage: 70V (voltage rating)
Maximum Output Current: 50mA per channel (current capacity)
Package Type: 8-DIP (0.400", 10.16mm) (physical and electrical interface)
Operating Temperature Range: -40°C ~ 85°C (thermal specification)

The FOD2743BTV meets all these criteria and is classified as an active product, making it a direct functional equivalent suitable for replacement applications.

Parameter Comparison

Parameter	FOD2743CT	FOD2743BTV	Match
Manufacturer	onsemi	onsemi	✓
Number of Channels	1	1	✓
Voltage - Isolation	5000Vrms	5000Vrms	✓
Current Transfer Ratio (Min)	50% @ 1mA	50% @ 1mA	✓
Current Transfer Ratio (Max)	100% @ 1mA	100% @ 1mA	✓
Output Type	Transistor	Transistor	✓
Voltage - Output (Max)	70V	70V	✓
Current - Output / Channel	50mA	50mA	✓
Voltage - Forward (Vf) (Typ)	1.07V	1.07V	✓
Vce Saturation (Max)	400mV	400mV	✓
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	✓
Package / Case	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	✓
Mounting Type	Through Hole	Through Hole	✓
Product Status	Obsolete	Active	—
REACH Status	REACH Unaffected	REACH Unaffected	✓
ECCN	EAR99	EAR99	✓
HTSUS	8541.49.8000	8541.49.8000	✓

Engineering Selection Recommendations

The FOD2743BTV is the direct substitute for the FOD2743CT. Selection is based on the following factors:

Product Status: The FOD2743BTV is classified as Active, ensuring ongoing availability and manufacturing support, whereas the FOD2743CT is Obsolete. This transition is necessary for long-term supply chain reliability.

Regulatory Compliance: Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring no change in export or environmental compliance requirements.

Electrical and Mechanical Equivalence: All critical electrical parameters—isolation voltage, current transfer ratio, output voltage and current ratings, and saturation characteristics—are identical. The 8-DIP through-hole package remains unchanged, allowing direct board-level substitution without layout modifications.

RoHS Compliance: The FOD2743BTV is RoHS3 Compliant, meeting modern environmental standards for new designs and procurement.