PS8821-1-F3-A Equivalent & Substitute Parts

Part Overview

The PS8821-1-F3-A is a 2500Vrms optoisolator with transistor output manufactured by CEL in the NEPOC series. This component features a single channel configuration in an 8-SOIC surface mount package, designed for DC input applications with 8mA output current capability. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

PS8821-1-F3-A

CELIn Stock: 1744PS8821-1-F3-A Datasheet

Current PartRFQ

PS8802-1-F3-AX

Renesas Electronics CorporationIn Stock: 2952PS8802-1-F3-AX Datasheet

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PS8802-1-V-AX

Renesas Electronics CorporationIn Stock: 1069PS8802-1-V-AX Datasheet

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PS8802-1-V-F3-AX

Renesas Electronics CorporationIn Stock: 2089PS8802-1-V-F3-AX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS8821-1-F3-A is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Isolation: 2500Vrms
• Number of Channels: 1
• Input Type: DC
• Output Type: Transistor (standard output, not base output variant)
• Current - Output / Channel: 8mA
• Voltage - Forward (Vf) (Typ): 1.7V
• Current - DC Forward (If) (Max): 25mA
• Operating Temperature: -55°C ~ 100°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Allowable Parameter Variations:

• Current Transfer Ratio (Min): Substitute minimum may be lower (15% acceptable vs. 20% original)
• Turn On / Turn Off Time (Typ): Substitute timing may differ (600ns acceptable vs. 500ns original)
• Voltage - Output (Max): Substitute may exceed original specification (35V acceptable vs. 7V original)

The PS8802-1-F3-AX qualifies as a direct substitute based on these criteria. The PS8802-1-V-AX and PS8802-1-V-F3-AX variants feature transistor with base output configuration and do not qualify as direct substitutes for standard transistor output applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: PS8802-1-F3-AX

The PS8802-1-F3-AX is the recommended direct substitute for the obsolete PS8821-1-F3-A. This part maintains identical electrical specifications for isolation voltage, channel count, input/output types, and thermal operating range. The PS8802-1-F3-AX is manufactured by Renesas Electronics Corporation with active product status, ensuring long-term availability and supply chain continuity. The part carries ROHS3 compliance and REACH unaffected status, providing superior regulatory positioning compared to the original part. The higher maximum output voltage (35V vs. 7V) and specified maximum current transfer ratio (45%) represent performance enhancements that do not compromise backward compatibility in applications designed for the original specification.

Alternative Variants: PS8802-1-V-AX and PS8802-1-V-F3-AX

The PS8802-1-V-AX and PS8802-1-V-F3-AX are not suitable direct substitutes for the PS8821-1-F3-A. These parts feature transistor with base output configuration, which differs fundamentally from the standard transistor output of the original part. Selection of these variants requires circuit redesign to accommodate the additional base connection and altered output characteristics. These parts are appropriate only for applications specifically requiring base output functionality.

Frequently Asked Questions (FAQ)

Q: Can the PS8802-1-F3-AX be used as a direct replacement for the PS8821-1-F3-A without circuit modification?

A: Yes. The PS8802-1-F3-AX maintains all critical electrical parameters including isolation voltage, channel configuration, input/output types, and operating temperature range. The part is pin-compatible within the 8-SOIC package and requires no circuit redesign.

Q: What is the significance of the lower minimum current transfer ratio (15% vs. 20%) in the PS8802-1-F3-AX?

A: The lower minimum CTR of the PS8802-1-F3-AX is acceptable for substitution purposes. The part specifies a maximum CTR of 45%, providing a wider operating range. Applications designed for the original 20% minimum will operate within the substitute's specified range.

Q: Why are the PS8802-1-V-AX and PS8802-1-V-F3-AX not suitable substitutes?

A: These variants feature transistor with base output configuration, which introduces an additional base connection not present in the original transistor output design. This architectural difference requires circuit modification and is not compatible with designs expecting standard transistor output.

Q: What packaging options are available for the PS8802-1-F3-AX substitute?

A: The PS8802-1-F3-AX is supplied in Cut Tape (CT) packaging. Alternative packaging formats (Strip and Tape & Reel) are available through the PS8802-1-V-AX and PS8802-1-V-F3-AX variants, though these feature different output configurations and are not direct substitutes.

Q: Does the PS8802-1-F3-AX meet current regulatory requirements?

A: Yes. The PS8802-1-F3-AX carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The original PS8821-1-F3-A is marked as REACH affected, making the substitute preferable for new designs and long-term compliance.

Q: Are there timing differences between the original and substitute parts?

A: The PS8802-1-F3-AX specifies turn-off time of 600ns compared to 500ns for the original part. This 100ns difference is within acceptable margins for most applications. Designs with critical timing requirements should verify compatibility through simulation or testing.

Q: What is the inventory status of the PS8802-1-F3-AX?

A: The PS8802-1-F3-AX has 2930 pieces in stock as new original inventory, providing immediate availability for production requirements.