OCP-PCT124/A Equivalent & Substitute Parts Reference

Part Overview

The OCP-PCT124/A is a 5000Vrms optoisolator with transistor output manufactured by Lumex Opto/Components Inc. This single-channel device operates in 4-DIP through-hole packaging and supports both AC and DC input types. The part is Active in product status with ROHS3 compliance and REACH unaffected classification. Substitute parts are identified based on matching isolation voltage, package type, output configuration, and electrical performance parameters within specified tolerances.

Substiute Parts

OCP-PCT124/A

Lumex Opto/Components Inc.In Stock: 657OCP-PCT124/A Datasheet

Current PartRFQ

FOD814

onsemiIn Stock: 15944FOD814 Datasheet

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FOD814A

onsemiIn Stock: 5117FOD814A Datasheet

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FOD814A300

onsemiIn Stock: 4399FOD814A300 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OCP-PCT124/A are qualified based on the following criteria:

Primary Matching Parameters:

• Voltage - Isolation: 5000Vrms (exact match required)
• Number of Channels: 1 (exact match required)
• Output Type: Transistor (exact match required)
• Package / Case: 4-DIP (0.300", 7.62mm) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Input Type: AC, DC (exact match required)

Secondary Compatibility Parameters:

• Current - Output / Channel: 50mA (exact match required)
• Voltage - Forward (Vf) (Typ): 1.2V (exact match required)
• Current - DC Forward (If) (Max): 50mA (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)
• REACH Status: REACH Unaffected (exact match required)

The three onsemi FOD814 series parts (FOD814, FOD814A, FOD814A300) meet all primary and secondary matching criteria. Variations in Current Transfer Ratio, Vce Saturation, Rise/Fall Time, and Operating Temperature range represent acceptable performance differences within the optoisolator transistor output category.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (FOD814, FOD814A, FOD814A300) are Active products with ROHS3 compliance and REACH unaffected status, matching the regulatory and compliance profile of the OCP-PCT124/A.

FOD814A and FOD814A300 are functionally equivalent variants with identical electrical specifications. Both feature Current Transfer Ratio minimum of 50% @ 1mA and maximum of 150% @ 1mA, with Vce Saturation of 200mV. These parts provide improved saturation characteristics compared to the OCP-PCT124/A (200mV versus 300mV) and extended operating temperature range (-55°C ~ 105°C versus -30°C ~ 100°C).

FOD814 offers the widest Current Transfer Ratio range (20% to 300% @ 1mA) and maintains identical Vce Saturation (200mV) and operating temperature specifications as FOD814A and FOD814A300. This part accommodates applications requiring broader transfer ratio tolerance.

All substitute parts support identical isolation voltage (5000Vrms), output current (50mA), forward voltage (1.2V), and package configuration (4-DIP through-hole). Selection between FOD814, FOD814A, and FOD814A300 depends on specific Current Transfer Ratio requirements for the application circuit.

Frequently Asked Questions (FAQ)

Q: Can FOD814, FOD814A, and FOD814A300 be used interchangeably with OCP-PCT124/A?

A: Yes, within the constraints of Current Transfer Ratio specifications. All three parts share identical isolation voltage (5000Vrms), package type (4-DIP), output configuration (transistor, 50mA), and compliance certifications (ROHS3, REACH unaffected). Selection depends on whether the application circuit requires the OCP-PCT124/A's higher Current Transfer Ratio range (60% to 600%) or can operate within the FOD814 series ranges.

Q: What is the difference between FOD814, FOD814A, and FOD814A300?

A: FOD814A and FOD814A300 are functionally identical with Current Transfer Ratio of 50% to 150% @ 1mA. FOD814 provides a wider Current Transfer Ratio range of 20% to 300% @ 1mA. All three share identical Vce Saturation (200mV), operating temperature range (-55°C ~ 105°C), and other electrical parameters. The "300" suffix in FOD814A300 refers to packaging or internal binning but does not affect electrical performance relative to FOD814A.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All substitute parts use identical 4-DIP (0.300", 7.62mm) through-hole packaging. Pin configuration and board layout compatibility are maintained across OCP-PCT124/A and all FOD814 series variants.

Q: How do the operating temperature ranges compare?

A: The OCP-PCT124/A operates from -30°C to 100°C. All FOD814 series substitutes (FOD814, FOD814A, FOD814A300) operate from -55°C to 105°C, providing extended low-temperature and high-temperature capability.

Q: What is the significance of Vce Saturation differences?

A: The OCP-PCT124/A specifies Vce Saturation (Max) of 300mV, while all FOD814 series parts specify 200mV. Lower saturation voltage indicates improved transistor saturation characteristics and reduced voltage drop across the output stage, resulting in lower power dissipation in the output circuit.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. OCP-PCT124/A and all three FOD814 series substitutes (FOD814, FOD814A, FOD814A300) are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.