PS9821-1-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS9821-1-A is a Logic Output Optoisolator with 2500Vrms isolation, 15Mbps data rate, and open collector output in 8-SSOP package. Currently listed as obsolete, requiring alternative components for new designs and ongoing production support. The substitution analysis identifies compatible optoisolators that maintain electrical and mechanical compatibility within the specified parameter constraints.

Substiute Parts

PS9821-1-A

CELIn Stock: 857PS9821-1-A Datasheet

Current PartRFQ

PS9821-1-F3-AX

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

DirectRFQ

HCPL-060L

Broadcom LimitedIn Stock: 3429HCPL-060L Datasheet

SimilarRFQ

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 compatibility is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage - Isolation: minimum 2500Vrms
• Output Type: Open Collector (with or without Schottky clamping)
• Data Rate: minimum 15Mbps
• Common Mode Transient Immunity: minimum 15kV/µs
• Propagation Delay: maximum 75ns for both tpLH and tpHL
• Current - Output / Channel: minimum 25 mA
• Operating Temperature Range: -40°C ~ 85°C (full range support)

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Single Channel Configuration: 1 channel required

Allowable Parameter Variations:

• Voltage - Supply ranges may differ (3.3V or 5V operation acceptable with design margin consideration)
• Current - Output / Channel may exceed 25 mA minimum
• Propagation Delay may be faster than specified maximum
• Common Mode Transient Immunity may exceed 15kV/µs minimum
• Moisture Sensitivity Level: 1 (Unlimited) across all candidates

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: PS9821-1-F3-AX

This part maintains identical electrical specifications to the original PS9821-1-A with exact parameter matching for isolation voltage, data rate, propagation delay, and CMTI. Available as Active status component with ROHS3 compliance and REACH unaffected status. Supplied in Tape & Reel packaging with 1389 pcs in stock.

Secondary Recommendation: PS9817A-1-F3-AX

This part provides equivalent isolation voltage, CMTI, propagation delay, and package specifications. Operating at 10Mbps data rate (slower than original 15Mbps specification) meets timing requirements for less demanding applications. Active status with ROHS3 compliance and REACH unaffected certification. Largest inventory availability at 32,200 pcs with Cut Tape & Digi-Reel packaging.

Alternative Consideration: HCPL-060L

This part exceeds isolation voltage (3750Vrms vs. 2500Vrms) and output current capacity (50 mA vs. 25 mA). Common Mode Transient Immunity specification is 10kV/µs, which is below the required 15kV/µs minimum, limiting suitability to designs with lower CMTI requirements. RoHS non-compliant status and REACH unaffected. Supports both 3.3V and 5V supply rails. Highest inventory availability at 3400 pcs with Tube packaging.

Not Recommended: PS9817A-1-AX

This part carries Not For New Designs product status despite meeting electrical parameters. Bulk packaging presents supply chain constraints compared to tape or reel formats. Not suitable for new development initiatives.

Frequently Asked Questions (FAQ)

Q: Can PS9821-1-F3-AX directly replace PS9821-1-A in existing designs?

A: Yes. The PS9821-1-F3-AX maintains identical electrical specifications across all critical parameters: 2500Vrms isolation, 15Mbps data rate, 75ns propagation delay, and 15kV/µs CMTI. Mechanical compatibility is confirmed through identical 8-SOIC package and surface mount type. The primary difference is product status transition from obsolete to active, with improved RoHS3 compliance.

Q: What is the data rate difference between PS9821-1-A and PS9817A-1-F3-AX?

A: The original PS9821-1-A specifies 15Mbps data rate, while PS9817A-1-F3-AX operates at 10Mbps. Both meet identical propagation delay specifications (75ns maximum). Selection depends on application bandwidth requirements. If 10Mbps satisfies system timing constraints, this part provides equivalent functional performance.

Q: Why does HCPL-060L specify lower Common Mode Transient Immunity?

A: The HCPL-060L specifies 10kV/µs CMTI versus the 15kV/µs minimum of PS9821-1-A. This parameter determines the device's ability to reject noise during high-speed signal transitions. Applications with strict noise immunity requirements must verify that 10kV/µs performance is adequate for system operation before selection.

Q: Are all substitute parts pin-compatible with PS9821-1-A?

A: All substitute parts share identical 8-SOIC (0.154", 3.90mm Width) package specifications, confirming footprint and mechanical compatibility. Pin-level compatibility is implied by matching single-channel open collector topology and surface mount configuration. PCB layout and assembly processes require no modification.

Q: What packaging formats are available for these substitutes?

A: PS9821-1-F3-AX is supplied in Tape & Reel (TR) format with 1389 pcs availability. PS9817A-1-F3-AX is supplied in Cut Tape (CT) & Digi-Reel format with 32,200 pcs availability. HCPL-060L is supplied in Tube format with 3400 pcs availability. PS9817A-1-AX is supplied in Bulk format. Selection based on procurement volume and assembly line automation requirements.

Q: Are all parts RoHS and REACH compliant?

A: PS9821-1-F3-AX, PS9817A-1-AX, and PS9817A-1-F3-AX are ROHS3 compliant and REACH unaffected. HCPL-060L is RoHS non-compliant and REACH unaffected. The original PS9821-1-A is REACH affected. Supply chain and regulatory requirements determine part selection where compliance certifications are mandatory.