MCT5211S Equivalent & Substitute Parts

Part Overview

The MCT5211S is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications requiring 5300Vrms isolation rating. This component features a single-channel configuration with transistor output and integrated base connection, housed in a 6-SMD surface mount package. The MCT5211S is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

MCT5211S

onsemiIn Stock: 1181MCT5211S Datasheet

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MCT5210SM

Fairchild SemiconductorIn Stock: 4651MCT5210SM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCT5211S is determined by the following critical parameters that must remain compatible:

• Isolation Voltage: The substitute must maintain isolation rating at or above 4170Vrms minimum
• Output Configuration: Transistor with base output is required
• Channel Count: Single-channel configuration
• Maximum Output Voltage & Current: 30V maximum and 150mA per channel
• Vce Saturation: 400mV maximum specification
• Package Type: 6-SMD, Gull Wing surface mount configuration
• Input Type: DC input requirement

The MCT5210SM qualifies as a functional substitute based on these parameters. While the MCT5210SM exhibits lower isolation voltage (4170Vrms versus 5300Vrms) and reduced current transfer ratio (70% @ 3mA versus 150% @ 1.6mA), it maintains compatibility across all critical mechanical and electrical interfaces required for direct substitution in applications where the lower isolation rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

The MCT5210SM is available as an active product from Fairchild Semiconductor, providing procurement continuity for the obsolete MCT5211S. Both components share identical mechanical packaging (6-SMD, Gull Wing) and are compatible with existing PCB layouts and assembly processes.

Selection of the MCT5210SM as a substitute requires evaluation of three specific design parameters:

1. Isolation Voltage Requirement: Applications requiring isolation above 4170Vrms cannot use the MCT5210SM. Designs operating at or below 4170Vrms isolation are compatible.

2. Current Transfer Ratio Margin: The MCT5210SM exhibits 70% minimum CTR compared to 150% for the MCT5211S. Circuit designs must accommodate this reduced gain characteristic through appropriate base drive current adjustment.

3. Operating Temperature Range: The MCT5210SM operates from -40°C minimum versus -55°C for the MCT5211S. Applications requiring operation below -40°C require the original MCT5211S or alternative sourcing.

Both components carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, ensuring equivalent export compliance status.

Frequently Asked Questions (FAQ)

Q: Can the MCT5210SM directly replace the MCT5211S without circuit modification?

A: Direct pin-compatible replacement is possible due to matching 6-SMD package configuration and identical output voltage/current ratings. However, the reduced current transfer ratio (70% versus 150%) may require adjustment of input drive current to maintain equivalent output switching performance. Verify that your application isolation voltage requirement does not exceed 4170Vrms.

Q: What is the primary difference between these two optoisolators?

A: The MCT5211S provides higher isolation voltage (5300Vrms) and higher current transfer ratio (150% @ 1.6mA) compared to the MCT5210SM (4170Vrms, 70% @ 3mA). The MCT5210SM offers faster switching times (10µs on, 400ns off versus 14µs on, 2.5µs off).

Q: Are there any temperature range limitations when substituting?

A: Yes. The MCT5210SM minimum operating temperature is -40°C, while the MCT5211S operates to -55°C. Applications requiring operation below -40°C cannot use the MCT5210SM substitute.

Q: Do both parts use the same PCB footprint?

A: Yes. Both components use 6-SMD, Gull Wing surface mount packaging with identical mechanical dimensions and pin configuration, allowing direct PCB layout compatibility.

Q: What compliance certifications apply to both parts?

A: Both the MCT5211S and MCT5210SM carry ECCN classification EAR99 and HTSUS code 8541.49.8000, indicating equivalent export control and tariff classification status.

Q: Is the MCT5210SM currently available for procurement?

A: Yes. The MCT5210SM is classified as an active product, ensuring ongoing availability from Fairchild Semiconductor and authorized distributors, unlike the obsolete MCT5211S.