PS9821-2-F4-AX Equivalent & Substitute Parts

Part Overview

The PS9821-2-F4-AX is a Logic Output Optoisolator from the NEPOC series manufactured by CEL, featuring 2500Vrms isolation voltage, 15Mbps data rate, and 15kV/µs common mode transient immunity in an 8-SSOP surface mount package. This part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility with existing designs.

Substiute Parts

PS9821-2-F4-AX

CELIn Stock: 2847PS9821-2-F4-AX 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

Substitute parts for the PS9821-2-F4-AX are classified into two categories based on allowed electrical parameters:

Direct Equivalents (Pin-Compatible, Identical Electrical Performance):

• PS9821-2-AX (Bulk packaging variant)
• PS9821-2-F3-AX (Cut Tape & Digi-Reel packaging variant)

These parts maintain identical electrical specifications across all critical parameters: 2500Vrms isolation voltage, 15Mbps data rate, 15kV/µs CMTI, 2.7V ~ 3.6V supply voltage, open collector output topology, and 8-SSOP package. The only differences are manufacturer status (active vs. discontinued) and packaging format.

Similar Alternatives (Reduced Performance, Same Package):

• PS9817A-2-AX (Bulk packaging variant)
• PS9817A-2-F3-AX (Cut Tape & Digi-Reel packaging variant)

These PS9817A variants share the same isolation voltage (2500Vrms), CMTI (15kV/µs), output type, channel count, and package geometry. However, they operate at reduced data rate (10Mbps vs. 15Mbps) and require different supply voltage range (4.5V ~ 5.5V vs. 2.7V ~ 3.6V).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Tier 1 - Recommended): PS9821-2-AX and PS9821-2-F3-AX are the primary substitutes. Both are manufactured by Renesas Electronics Corporation (active manufacturer status) and maintain full electrical equivalence with the discontinued PS9821-2-F4-AX. Select PS9821-2-AX for bulk packaging requirements or PS9821-2-F3-AX for tape-and-reel distribution. Both are ROHS3 compliant with identical MSL ratings.

For Supply Voltage-Dependent Applications (Tier 2 - Conditional): PS9817A-2-AX and PS9817A-2-F3-AX function as electrical alternatives only in applications where the reduced 10Mbps data rate is acceptable and power supply range can accommodate 4.5V ~ 5.5V operation. The PS9817A-2-F3-AX maintains active product status; PS9817A-2-AX is marked as "Not For New Designs." Both maintain 2500Vrms isolation and 15kV/µs CMTI specifications required for high-speed signal isolation.

Frequently Asked Questions (FAQ)

Q: Can PS9821-2-AX or PS9821-2-F3-AX directly replace PS9821-2-F4-AX? A: Yes. Both parts are electrical and mechanical equivalents with identical isolation voltage (2500Vrms), data rate (15Mbps), CMTI (15kV/µs), output type, and package specifications. The only differences are manufacturer (Renesas vs. CEL) and packaging format (Bulk vs. Cut Tape & Digi-Reel). No PCB or firmware modifications are required.

Q: What is the key limitation of PS9817A substitutes? A: The PS9817A series operates at 10Mbps maximum data rate compared to the 15Mbps specification of PS9821 parts. Additionally, PS9817A requires 4.5V ~ 5.5V supply voltage, whereas PS9821 operates at 2.7V ~ 3.6V. These parts are suitable only when system design can accommodate reduced bandwidth and different power supply parameters.

Q: Are all substitute parts ROHS3 compliant? A: Yes. PS9821-2-AX, PS9821-2-F3-AX, PS9817A-2-AX, and PS9817A-2-F3-AX are all ROHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity rating).

Q: What is the difference between Bulk and Cut Tape & Digi-Reel packaging? A: Bulk packaging (PS9821-2-AX, PS9817A-2-AX) is used for loose component quantities, while Cut Tape & Digi-Reel packaging (PS9821-2-F3-AX, PS9817A-2-F3-AX) is suitable for automated assembly environments. Electrical performance is identical; selection depends on procurement and manufacturing processes.

Q: Is the package geometry identical across all variants? A: Yes. All five parts (PS9821-2-F4-AX and four substitutes) share the same 8-SOIC package with 0.154" width and 3.90mm physical dimensions, enabling direct PCB footprint compatibility.

Q: Why is PS9817A marked "Not For New Designs"? A: PS9817A-2-AX carries "Not For New Designs" status, indicating it may be approaching obsolescence. While functionally operational, new designs should prioritize PS9821-2-F3-AX or PS9817A-2-F3-AX if PS9817A substitution is necessary.