PS9821-1-F3-A Optoisolator Equivalent and Substitute Parts

Part Overview

The PS9821-1-F3-A is a logic output optoisolator from CEL (series NEPOC) featuring 2500Vrms galvanic isolation, 15Mbps data rate capability, and open collector output configuration in an 8-SSOP package. This component is rated for 1 channel with 1 input and common mode transient immunity of 15kV/µs.

The PS9821-1-F3-A is currently classified as obsolete product status. Direct substitution is necessary for new designs and ongoing maintenance applications. Equivalent parts from Renesas Electronics Corporation are available with maintained electrical and mechanical compatibility for circuit-level drop-in replacement.

Substiute Parts

PS9821-1-F3-A

CELIn Stock: 2583PS9821-1-F3-A Datasheet

Current PartRFQ

PS9821-1-F3-AX

Renesas Electronics CorporationIn Stock: 1437PS9821-1-F3-AX Datasheet

DirectRFQ

PS9817A-1-AX

Renesas Electronics CorporationIn Stock: 1283PS9817A-1-AX Datasheet

SimilarRFQ

PS9817A-1-F3-AX

Renesas Electronics CorporationIn Stock: 32294PS9817A-1-F3-AX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS9821-1-F3-A is governed by the following electrical and mechanical parameters that define compatibility:

Critical Parameters (Must Match):

• Voltage - Isolation: 2500Vrms
• Number of Channels: 1
• Output Type: Open Collector
• Current - Output / Channel: 25 mA
• Common Mode Transient Immunity: 15kV/µs
• Propagation Delay tpLH / tpHL: 75ns / 75ns
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Operating Temperature Range: -40°C to 85°C

Variable Parameters (Allow Substitution):

• Data Rate: 10–15 Mbps (parts rated 10Mbps can substitute for 15Mbps applications requiring lower bandwidth tolerance)
• Voltage - Supply: 2.7–5.5V range (parts specified for 4.5–5.5V supply operate within acceptable input current specifications)
• Packaging Format: Tape & Reel (TR), Bulk, or Cut Tape (CT) & Digi-Reel®
• Product Status: Active or Not For New Designs (both support functional continuity)

The PS9821-1-F3-AX serves as the direct equivalent, maintaining all critical parameters with active product status. The PS9817A variants provide similar performance with reduced data rate specification and modified supply voltage range.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: PS9821-1-F3-AX

The PS9821-1-F3-AX is the direct equivalent for PS9821-1-F3-A replacement. This component maintains all critical electrical parameters and shares identical package specifications. The PS9821-1-F3-AX carries active product status from Renesas Electronics Corporation and is ROHS3 compliant with REACH unaffected status, supporting full supply chain compliance for new production and long-term availability.

Alternative Selection: PS9817A-1-F3-AX

The PS9817A-1-F3-AX is classified as a similar substitute when design requirements can accommodate a reduced data rate specification of 10Mbps versus the original 15Mbps rating. This part features active product status, ROHS3 compliance, and REACH unaffected certification. The supply voltage range differs at 4.5–5.5V; circuit design must confirm compatibility with this supply requirement before selection.

Not Recommended: PS9817A-1-AX

The PS9817A-1-AX exhibits "Not For New Designs" product status and is supplied in bulk packaging format. While electrical parameters remain compatible, the product lifecycle status and packaging configuration make this selection unsuitable for new production applications or designs requiring established supply chain assurance.

Frequently Asked Questions (FAQ)

Q: Can PS9821-1-F3-AX directly replace PS9821-1-F3-A without circuit modification?

A: Yes. The PS9821-1-F3-AX maintains identical electrical specifications across isolation voltage, output current, propagation delay, and supply voltage range. The 8-SSOP package and surface mount configuration enable direct board-level substitution without circuit redesign.

Q: What is the primary difference between PS9821-1-F3-AX and PS9817A-1-F3-AX?

A: The data rate specification differs: PS9821-1-F3-AX supports 15Mbps operation while PS9817A-1-F3-AX is rated for 10Mbps maximum. The supply voltage range also differs: PS9821-1-F3-AX accepts 2.7–3.6V, whereas PS9817A-1-F3-AX requires 4.5–5.5V. All other parameters including isolation voltage, output current, and propagation delay remain identical.

Q: Why is the PS9821-1-F3-A listed as obsolete?

A: The PS9821-1-F3-A obsolete status reflects product lifecycle management by CEL. Renesas Electronics Corporation manufactures electrically equivalent alternatives (PS9821-1-F3-AX) with active product status, ensuring availability and long-term supply chain support.

Q: Are there packaging considerations when substituting PS9821-1-F3-A with PS9821-1-F3-AX?

A: Both components use the 8-SSOP (8-SOIC) package specification of 0.154" width with 3.90mm dimensions. The primary packaging difference is format: PS9821-1-F3-A is supplied in bulk, while PS9821-1-F3-AX is available in Tape & Reel (TR) format. This difference does not affect electrical compatibility or PCB assembly compatibility.

Q: Which substitute part should be selected for cost optimization?

A: Cost optimization depends on supply voltage requirements. If the circuit operates at 2.7–3.6V logic levels, PS9821-1-F3-AX is the appropriate selection. If the circuit operates at 4.5–5.5V logic levels and data rate requirements are 10Mbps or less, PS9817A-1-F3-AX may provide cost advantages. Both parts are ROHS3 compliant and REACH unaffected, supporting equivalent supply chain and compliance profiles.

Q: Is PS9817A-1-AX suitable for new product designs?

A: No. The PS9817A-1-AX carries "Not For New Designs" product status. New designs should select either PS9821-1-F3-AX (preferred) or PS9817A-1-F3-AX (if supply voltage and data rate requirements allow). Both alternatives support active product lifecycles and current manufacturing availability.