PS8821-2-A Equivalent & Substitute Parts

Part Overview

The PS8821-2-A is a 2-channel optoisolator with transistor output manufactured by CEL, rated for 2500Vrms isolation voltage. This component is classified as Obsolete, indicating it is no longer in active production. The NEPOC series optoisolator provides galvanic isolation for signal transmission in industrial and consumer applications requiring high voltage isolation.

Due to its obsolete status, alternative components from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain electrical and mechanical compatibility while offering improved availability and compliance status.

Substiute Parts

PS8821-2-A

CELIn Stock: 2295PS8821-2-A Datasheet

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PS8802-2-AX

Renesas Electronics CorporationIn Stock: 1385PS8802-2-AX Datasheet

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PS8802-2-F3-AX

Renesas Electronics CorporationIn Stock: 3704PS8802-2-F3-AX Datasheet

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PS8802-2-F4-AX

Renesas Electronics CorporationIn Stock: 1066PS8802-2-F4-AX Datasheet

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PS8802-2-V-AX

Renesas Electronics CorporationIn Stock: 1257PS8802-2-V-AX Datasheet

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PS8802-2-V-F3-AX

Renesas Electronics CorporationIn Stock: 2325PS8802-2-V-F3-AX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PS8821-2-A are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Number of Channels: 2 (must match)
• Voltage - Isolation: 2500Vrms (must match)
• Input Type: DC (must match)
• Output Type: Transistor (must match for PS8802-2-AX, PS8802-2-F3-AX, PS8802-2-F4-AX, PS8802-2-V-F3-AX; Darlington with Base for PS8802-2-V-AX)
• Mounting Type: Surface Mount (must match)
• Package / Case: 8-SOIC (0.154", 3.90mm Width) (must match)
• Operating Temperature: -55°C ~ 100°C (must match)
• Current - Output / Channel: 8mA (must match)

Secondary Compatibility Considerations:

• Current Transfer Ratio specifications
• Turn On / Turn Off Time characteristics
• Voltage - Output (Max) ratings
• Product Status and compliance certifications

All substitute parts listed maintain the core electrical isolation, channel configuration, and physical package specifications required for direct replacement in applications designed for the PS8821-2-A.

Parameter Comparison

Engineering Selection Recommendations

For Active Production and New Designs:

PS8802-2-F3-AX and PS8802-2-V-F3-AX are the primary recommended substitutes. Both components carry Active product status, ensuring long-term availability and manufacturer support. PS8802-2-F3-AX is available in Cut Tape (CT) packaging with REACH Unaffected compliance status, making it suitable for applications with strict regulatory requirements. PS8802-2-V-F3-AX is supplied in Tape & Reel (TR) format, optimized for high-volume production environments.

For Existing Inventory Management:

PS8802-2-F4-AX provides an alternative Active-status option with identical electrical specifications to PS8802-2-F3-AX. Current inventory levels across all substitute parts exceed 1000 units, ensuring supply continuity.

Compliance Considerations:

All substitute parts from Renesas Electronics Corporation comply with ROHS3 standards. PS8802-2-F3-AX and PS8802-2-F4-AX carry REACH Unaffected status, while PS8802-2-V-F3-AX also maintains REACH Unaffected compliance. PS8802-2-AX, classified as Not For New Designs, carries REACH Affected status and should be reserved for legacy system maintenance only.

Output Type Consideration:

PS8802-2-V-AX features Darlington with Base output configuration, differing from the transistor output of the main part and other substitutes. This variant is suitable only for applications specifically designed for Darlington output characteristics.

Voltage Rating Difference:

Substitute parts PS8802-2-AX, PS8802-2-F3-AX, PS8802-2-F4-AX, and PS8802-2-V-F3-AX specify maximum output voltage of 35V, compared to 7V for the PS8821-2-A. This higher rating provides additional design margin in applications with elevated output voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can PS8802-2-F3-AX directly replace PS8821-2-A in existing circuit designs?

A: Yes, PS8802-2-F3-AX provides direct functional replacement. Both components share identical channel count (2), isolation voltage (2500Vrms), input type (DC), output type (Transistor), package configuration (8-SOIC), and operating temperature range (-55°C ~ 100°C). The higher maximum output voltage (35V vs. 7V) and improved current transfer ratio range (15-45% vs. 20% minimum) represent enhanced performance characteristics compatible with existing designs.

Q: What is the difference between PS8802-2-F3-AX and PS8802-2-V-F3-AX?

A: Both parts are electrically equivalent with identical isolation voltage, channel configuration, and operating temperature. The primary difference is packaging format: PS8802-2-F3-AX is supplied in Cut Tape (CT) for smaller quantity orders, while PS8802-2-V-F3-AX is supplied in Tape & Reel (TR) format optimized for automated assembly and high-volume production. PS8802-2-V-F3-AX also carries REACH Unaffected compliance status.

Q: Why does PS8802-2-V-AX have different output type specifications?

A: PS8802-2-V-AX features Darlington with Base output configuration, distinct from the standard Transistor output of other substitutes. This output type is suitable only for applications specifically designed to interface with Darlington output characteristics. For direct replacement of PS8821-2-A transistor output functionality, use PS8802-2-F3-AX, PS8802-2-F4-AX, or PS8802-2-V-F3-AX instead.

Q: What is the significance of "Not For New Designs" status for PS8802-2-AX?

A: This status indicates the component is available for existing production and legacy system support but should not be selected for new circuit designs. For new applications, choose PS8802-2-F3-AX, PS8802-2-F4-AX, or PS8802-2-V-F3-AX, all classified as Active products with extended lifecycle support.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes, all substitute parts use the 8-SOIC (0.154", 3.90mm Width) package configuration, ensuring mechanical and electrical compatibility with existing PCB layouts designed for PS8821-2-A.

Q: What packaging options are available for production orders?

A: PS8802-2-F3-AX is available in Cut Tape (CT) format for standard orders. PS8802-2-V-F3-AX is supplied in Tape & Reel (TR) format for automated assembly lines. PS8802-2-AX and PS8802-2-F4-AX are available in Strip and unspecified packaging formats respectively. Packaging selection should align with production volume and assembly equipment capabilities.

Q: How do current transfer ratio specifications affect circuit performance?

A: The PS8821-2-A specifies minimum current transfer ratio of 20% at 16mA input current. Substitute parts specify 15% minimum with 45% maximum at the same input current. The wider specification range in substitute parts reflects improved manufacturing process control. Circuits designed for 20% minimum CTR will operate within the substitute part specifications, with potential for improved performance margin at the upper end of the range.

Q: What is the impact of turn-off time differences between PS8821-2-A and substitutes?

A: PS8821-2-A specifies turn-off time of 500ns typical, while substitute parts specify 600ns typical. This 100ns difference is negligible in most industrial applications operating below 1MHz switching frequencies. For high-speed switching applications, verify that 600ns turn-off time meets circuit timing requirements before component selection.