PS9821-2-F4-A Equivalent & Substitute Parts

Part Overview

The PS9821-2-F4-A is a Logic Output Optoisolator from CEL's NEPOC series, providing 2500Vrms isolation with 2 channels in an 8-SSOP package. This device delivers 15Mbps data rate performance with 15kV/µs common mode transient immunity and open collector output configuration. The main part is marked as Obsolete, necessitating identification of active equivalent and substitute components for continued system support and new designs.

Substiute Parts

PS9821-2-F4-A

CELIn Stock: 842PS9821-2-F4-A Datasheet

Current PartRFQ

PS9821-2-AX

Renesas Electronics CorporationIn Stock: 2249PS9821-2-AX Datasheet

DirectRFQ

PS9821-2-F3-AX

Renesas Electronics CorporationIn Stock: 1505PS9821-2-F3-AX Datasheet

DirectRFQ

PS9817A-2-AX

Renesas Electronics CorporationIn Stock: 1949PS9817A-2-AX Datasheet

SimilarRFQ

PS9817A-2-F3-AX

Renesas Electronics CorporationIn Stock: 1801PS9817A-2-F3-AX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS9821-2-F4-A is determined by the following critical electrical and mechanical parameters: Number of Channels (2), Isolation Voltage (2500Vrms), CMTI (15kV/µs), Output Type (Open Collector), Package (8-SSOP), and mounting type (Surface Mount). These parameters define the core functionality and physical compatibility requirements.

The substitute parts are grouped into two categories based on data rate performance:

Direct Substitutes (15Mbps Data Rate): PS9821-2-AX and PS9821-2-F3-AX maintain identical electrical performance, including the 15Mbps data rate, propagation delay, and rise/fall time specifications. These parts are functionally equivalent and differ only in packaging format (Bulk vs. Cut Tape & Digi-Reel). Both are manufactured by Renesas Electronics Corporation with Active product status and ROHS3 compliance.

Similar Substitutes (10Mbps Data Rate): PS9817A-2-AX and PS9817A-2-F3-AX share the same isolation voltage, CMTI, output type, and package configuration but operate at a reduced 10Mbps data rate. These parts are suitable for applications where the lower bandwidth requirement is acceptable. The PS9817A-2-AX is marked as Not For New Designs, while PS9817A-2-F3-AX is Active.

Parameter Comparison

Engineering Selection Recommendations

For new designs, PS9821-2-F3-AX is the primary recommended substitute. This part maintains full electrical and functional equivalence with the PS9821-2-F4-A while offering Active product status from Renesas Electronics Corporation with ROHS3 compliance. The Cut Tape & Digi-Reel packaging format supports both prototype and production manufacturing workflows.

PS9821-2-AX serves as an alternative direct substitute with identical electrical specifications and Active status, with Bulk packaging suitable for high-volume procurement. Both PS9821 variants (15Mbps) are preferred over PS9817A options where bandwidth requirements align with the 15Mbps specification.

PS9817A-2-F3-AX is acceptable as a substitute only when the application's bandwidth requirement does not exceed 10Mbps and power supply availability allows for the 4.5V ~ 5.5V operating range. This part maintains Active product status and ROHS3 compliance. PS9817A-2-AX carries Not For New Designs designation and should not be selected for new development.

All substitute parts share identical isolation voltage (2500Vrms), CMTI performance (15kV/µs), output configuration (Open Collector), and mechanical form factor (8-SSOP package, 0.154" width) as the original PS9821-2-F4-A.

Frequently Asked Questions (FAQ)

Q: Can I use PS9821-2-AX in place of PS9821-2-F4-A directly in my PCB assembly?

A: Yes. PS9821-2-AX is a direct electrical and mechanical equivalent. The difference is packaging format: PS9821-2-F4-A ships on Tape & Reel while PS9821-2-AX ships in Bulk. Both occupy identical 8-SOIC footprint (0.154" width, 3.90mm) and mount identically on PCB. Verify your assembly process accommodates bulk or tape & reel packaging.

Q: What is the key difference between PS9821 and PS9817A series substitutes?

A: Data rate performance. PS9821 parts operate at 15Mbps while PS9817A parts operate at 10Mbps. All other critical parameters (isolation voltage, CMTI, output type, package) remain identical. For applications requiring bandwidth above 10Mbps, PS9821 series is required. Additionally, PS9817A-2-AX is marked Not For New Designs.

Q: Why does PS9817A require different supply voltage?

A: PS9821 series operates on 2.7V ~ 3.6V supply while PS9817A series requires 4.5V ~ 5.5V. This represents a different power supply domain. Substitution with PS9817A requires board-level power supply adjustment and design re-qualification.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts from Renesas Electronics (PS9821-2-AX, PS9821-2-F3-AX, PS9817A-2-AX, PS9817A-2-F3-AX) carry ROHS3 Compliant status. The original PS9821-2-F4-A from CEL does not specify RoHS status.

Q: Which substitute is best for new product development?

A: PS9821-2-F3-AX. This part is Active, ROHS3 compliant, maintains full 15Mbps performance equivalent to the original PS9821-2-F4-A, and supports standard Cut Tape & Digi-Reel packaging. It is the direct replacement for obsolete designs transitioning to production.

Q: Are propagation delays and rise/fall times identical across all parts?

A: Propagation delay and rise/fall time specifications are identical across all five parts (75ns max delay in both directions; 20ns typical rise time, 5ns typical fall time). This ensures timing-critical applications can substitute without recalibration of signal integrity margins.