PS9821-1-AX Equivalent & Substitute Parts

Part Overview

The PS9821-1-AX is a Logic Output Optoisolator operating at 2500Vrms isolation voltage with 15Mbps data rate and open collector output configuration in 8-SSOP package. This device is discontinued at DiGi Electronics, necessitating evaluation of equivalent alternatives that maintain functional compatibility for existing designs.

Substiute Parts

PS9821-1-AX

CELIn Stock: 1607PS9821-1-AX 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 logic for the PS9821-1-AX is determined by maintaining these critical parameters across alternative parts:

Primary Substitution Criteria:

• Isolation Voltage: 2500Vrms
• Output Type: Open Collector
• Common Mode Transient Immunity: 15kV/µs minimum
• Package: 8-SSOP (8-SOIC equivalent)
• Number of Channels: 1
• Operating Temperature Range: -40°C to 85°C

The substitute parts are grouped into two classifications based on data rate alignment:

Direct Substitutes (15Mbps Data Rate): PS9821-1-F3-AX maintains identical data rate and supply voltage specifications, providing direct functional replacement.

Similar Substitutes (10Mbps Data Rate): PS9817A-1-AX and PS9817A-1-F3-AX operate at reduced data rate (10Mbps) with different supply voltage requirements (4.5V ~ 5.5V), suitable where lower bandwidth requirements exist.

Parameter Comparison

Engineering Selection Recommendations

PS9821-1-F3-AX (Direct Substitute): This part is the preferred replacement for PS9821-1-AX. It matches all electrical specifications including 15Mbps data rate and 2.7V–3.6V supply voltage range. The device carries Active product status, ROHS3 compliance, and highest availability in Tape & Reel packaging. Selection of this part requires no design modifications.

PS9817A-1-F3-AX (Similar Substitute): This part maintains 2500Vrms isolation, open collector output, and 15kV/µs CMTI but operates at 10Mbps data rate with 4.5V–5.5V supply voltage. Active product status and largest inventory (32200 pcs) provide supply assurance. Selection requires design verification that 10Mbps bandwidth is sufficient and that supply voltage modification is feasible.

PS9817A-1-AX (Similar Substitute): This part carries "Not For New Designs" status and should be selected only when PS9821-1-F3-AX or PS9817A-1-F3-AX are unavailable. It operates at 10Mbps with 4.5V–5.5V supply voltage and is provided in Bulk packaging. Design verification for reduced data rate is required.

Frequently Asked Questions (FAQ)

Q: Can PS9821-1-F3-AX be used as a drop-in replacement for PS9821-1-AX? A: Yes. PS9821-1-F3-AX maintains identical electrical specifications (15Mbps, 2500Vrms isolation, 2.7V–3.6V supply) and package form factor. No design modifications are required.

Q: What is the key difference between PS9821-1-AX and PS9817A-1-F3-AX? A: The primary difference is data rate: PS9821-1-AX operates at 15Mbps while PS9817A-1-F3-AX is specified for 10Mbps. Additionally, PS9817A-1-F3-AX requires 4.5V–5.5V supply voltage versus 2.7V–3.6V for PS9821-1-AX. Both maintain 2500Vrms isolation and open collector output.

Q: Are all substitute parts compatible with the same PCB layout? A: Yes. All parts use the 8-SSOP package with identical 8-SOIC dimensions (0.154" width, 3.90mm). PCB layout changes are not required for any of the listed substitutes.

Q: Which substitute offers the best supply availability? A: PS9817A-1-F3-AX has the highest documented inventory at 32200 pieces and carries Active product status, ensuring long-term availability. However, data rate verification is required prior to selection.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitutes and the main part are ROHS3 compliant.

Q: What is the difference in packaging between the substitute options? A: PS9821-1-F3-AX is supplied in Tape & Reel (TR) packaging. PS9817A-1-F3-AX is supplied in Cut Tape (CT) & Digi-Reel® packaging. PS9817A-1-AX is supplied in Bulk packaging. Selection depends on assembly process requirements and order quantities.