PS9121-F3-A Equivalent & Substitute Parts Reference

Part Overview

The PS9121-F3-A is a Logic Output Optoisolator manufactured by CEL, designed for high-speed isolation applications requiring 3750Vrms isolation voltage. This single-channel optoisolator features 15Mbps data rate capability with open collector output and 15kV/µs common mode transient immunity. The device is currently classified as obsolete, necessitating identification of equivalent and substitute components for continued system development and maintenance.

Substiute Parts

PS9121-F3-A

CELIn Stock: 17752PS9121-F3-A Datasheet

Current PartRFQ

HCPL-M611-560E

Broadcom LimitedIn Stock: 4062HCPL-M611-560E Datasheet

SimilarRFQ

PS9122-F3-AX

Renesas Electronics CorporationIn Stock: 18447PS9122-F3-AX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS9121-F3-A requires matching critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage isolation rating: 3750Vrms minimum
• Package compatibility: 6-SOIC (0.173", 4.40mm Width), 5 Leads
• Output type: Open Collector configuration
• Number of channels: 1 channel
• Input type: DC
• Mounting type: Surface Mount

Secondary Compatibility Criteria:

• Common Mode Transient Immunity: 15kV/µs or greater
• Data rate: 15Mbps or greater (for high-speed applications)
• Operating temperature range: -40°C ~ 85°C or greater
• Supply voltage compatibility with system requirements

The PS9121-F3-A has two identified equivalents: the HCPL-M611-560E (Broadcom Limited) and the PS9122-F3-AX (Renesas Electronics Corporation). Both maintain identical isolation voltage, package type, output configuration, and channel count. Variations in data rate, CMTI performance, supply voltage requirements, and propagation delay characteristics must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

HCPL-M611-560E (Broadcom Limited): This substitute is currently active in production. It maintains identical isolation voltage and package specifications but operates at reduced CMTI (10kV/µs versus 15kV/µs) and data rate (10MBd versus 15Mbps). The device features Schottky clamped output configuration and higher output current capability (50 mA). Supply voltage requirement is 4.5V ~ 5.5V, requiring voltage translation from 2.7V ~ 3.6V supply systems. RoHS3 Compliant and REACH Unaffected status supports regulatory alignment.

PS9122-F3-AX (Renesas Electronics Corporation): This substitute maintains identical CMTI performance (15kV/µs) and isolation voltage. The device is currently active in production with RoHS3 Compliant status and REACH Unaffected designation. Significant differences include reduced data rate (1Mbps), extended propagation delay (700ns/500ns), and fixed supply voltage at 7V. Output current capability is 20 mA. Operating temperature range extends to 100°C. This option is preferred for applications prioritizing CMTI performance match and temperature margin over data rate requirements.

Selection between substitutes depends on application timing constraints, supply voltage availability, and CMTI performance requirements. Both maintain identical mechanical packaging, enabling direct footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can PS9121-F3-A be replaced with HCPL-M611-560E without redesign? A: Package and isolation voltage are identical, but the supply voltage requirement (4.5V ~ 5.5V vs. 2.7V ~ 3.6V) and reduced data rate (10MBd vs. 15Mbps) require evaluation. Systems operating above 10MBd data rates cannot use this substitute. Power supply voltage translation may be required.

Q: Which substitute best matches PS9121-F3-A performance? A: PS9122-F3-AX matches the 15kV/µs CMTI specification exactly. However, 1Mbps data rate limit restricts use to low-speed applications. HCPL-M611-560E supports 10MBd operation with 10kV/µs CMTI, suitable for mid-speed applications with reduced transient immunity margin.

Q: Are both substitutes footprint compatible? A: Yes. Both substitutes use identical 6-SOIC (0.173", 4.40mm Width), 5-lead packaging. PCB layouts require no modification for physical placement. Logic interface and supply voltage considerations must be evaluated separately.

Q: What is the impact of lower CMTI in HCPL-M611-560E? A: CMTI (10kV/µs) is 33% lower than PS9121-F3-A (15kV/µs). Applications experiencing high dV/dt transient conditions during isolation barrier crossing may require additional circuit protection or filtering when substituting this device.

Q: Does supply voltage difference affect circuit design? A: PS9121-F3-A operates at 2.7V ~ 3.6V, HCPL-M611-560E at 4.5V ~ 5.5V, and PS9122-F3-AX at 7V fixed. Direct supply connection without voltage conversion is not possible. Power supply architecture review is required for any substitute selection.

Q: Are these devices RoHS compliant? A: PS9121-F3-A provides no RoHS status in available data. Both substitutes are RoHS3 Compliant. REACH status differs: PS9121-F3-A is REACH Affected; both substitutes are REACH Unaffected.

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