PS2861-1-K-A Equivalent & Substitute Parts

Part Overview

The PS2861-1-K-A is a 2500Vrms optoisolator with transistor output manufactured by CEL in a 4-SOIC surface mount package. This component provides galvanic isolation for single-channel DC input applications with a maximum output current of 40mA per channel. The part is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for ongoing production and maintenance applications.

Substiute Parts

PS2861-1-K-A

CELIn Stock: 960PS2861-1-K-A Datasheet

Current PartRFQ

PS2811-1-K-A

Renesas Electronics CorporationIn Stock: 743PS2811-1-K-A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS2861-1-K-A is determined by the following critical parameters that must remain constant across equivalent components:

Mandatory Matching Parameters:

• Voltage - Isolation: 2500Vrms
• Number of Channels: 1
• Output Type: Transistor
• Voltage - Output (Max): 40V
• Current - Output / Channel: 40mA
• Operating Temperature Range: -55°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 4-SOIC (0.173", 4.40mm Width)
• Input Type: DC
• Vce Saturation (Max): 300mV

Allowable Parameter Variations:

• Current Transfer Ratio specifications may vary within the 200% to 400% range at different test currents
• Voltage - Forward (Vf) may vary within typical specifications
• Rise / Fall Time characteristics may differ while maintaining functional performance
• Supplier device package designation may differ (4-SOP vs. 4-SSOP) provided physical dimensions remain compatible

The PS2811-1-K-A qualifies as a direct substitute based on matching all mandatory parameters while maintaining electrical performance within specified tolerances.

Parameter Comparison

Engineering Selection Recommendations

The PS2811-1-K-A is a qualified direct substitute for the PS2861-1-K-A based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match or fall within acceptable tolerance ranges. The isolation voltage, output current rating, saturation voltage, and operating temperature range are identical. Current transfer ratio specifications are compatible, with the PS2811-1-K-A tested at a lower input current (1mA vs. 5mA) while maintaining the same minimum and maximum CTR percentages.

Mechanical Compatibility: Both components utilize identical 4-SOIC surface mount packages with matching physical dimensions (0.173", 4.40mm width), ensuring direct PCB footprint compatibility without layout modifications.

Product Status and Compliance: The PS2811-1-K-A is classified as active, providing assured long-term availability compared to the obsolete PS2861-1-K-A. The substitute part carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Both parts maintain identical REACH and ECCN classifications.

Moisture Sensitivity: Both components share MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

Selection of the PS2811-1-K-A eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can the PS2811-1-K-A be used as a direct replacement for the PS2861-1-K-A without PCB modifications?

A: Yes. Both components share identical 4-SOIC package dimensions and pin configurations. No PCB layout changes are required for substitution.

Q: What is the difference in Current Transfer Ratio testing between these parts?

A: The PS2861-1-K-A specifies CTR at 5mA input current, while the PS2811-1-K-A specifies CTR at 1mA input current. Both maintain the same 200% minimum and 400% maximum CTR range. The lower test current for the PS2811-1-K-A indicates superior input sensitivity.

Q: Are there any thermal or operating condition differences?

A: No. Both components operate across the identical temperature range of -55°C to 100°C with matching maximum output voltage (40V) and output current (40mA) specifications.

Q: Does the PS2811-1-K-A meet current environmental compliance standards?

A: Yes. The PS2811-1-K-A carries ROHS3 compliance certification. Both parts maintain identical REACH and ECCN classifications (EAR99).

Q: What is the significance of the different supplier device package designations (4-SOP vs. 4-SSOP)?

A: The designations reflect different supplier naming conventions for the same physical package. The 4-SOIC (0.173", 4.40mm width) specification confirms physical compatibility. Both designations refer to functionally equivalent small-outline packages.

Q: Is the PS2811-1-K-A available in the same quantities as the PS2861-1-K-A?

A: Inventory levels differ. The PS2811-1-K-A has 644 pieces in stock compared to 861 pieces for the PS2861-1-K-A. Availability should be confirmed with the supplier for production requirements.

Q: What is the impact of the 0.05V difference in forward voltage (Vf)?

A: The Vf difference (1.1V vs. 1.15V) is within typical component tolerance ranges and does not affect circuit functionality. Input drive circuits should be designed to accommodate standard LED forward voltage variations.