MCT52003S Equivalent & Substitute Parts

Part Overview

The MCT52003S 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 transistor output configuration in a 6-SMD surface mount package. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where this isolation topology is required.

Key Parameters

Parameter	MCT52003S
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	75% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	150mA
Vce Saturation (Max)	400mV
Operating Temperature Range	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MCT52003S is determined by the following critical parameters:

Isolation Voltage Rating: Minimum 4170Vrms (allowing for lower isolation ratings in active alternatives)
Number of Channels: Must be 1 channel
Output Configuration: Transistor with base output required
Maximum Output Voltage: 30V or greater
Maximum Output Current: 150mA or greater per channel
Vce Saturation: 400mV or lower
Package Type: 6-SMD, Gull Wing surface mount configuration
Input Type: DC input
Mounting: Surface mount technology

The MCT5210SM from Fairchild Semiconductor meets these substitution criteria while maintaining active product status and equivalent mechanical compatibility.

Parameter Comparison

Parameter	MCT52003S (onsemi)	MCT5210SM (Fairchild Semiconductor)	Compatibility
Number of Channels	1	1	Match
Voltage - Isolation	5300Vrms	4170Vrms	Substitute rated lower; acceptable for applications not requiring 5300Vrms
Current Transfer Ratio (Min)	75% @ 10mA	70% @ 3mA	Substitute has lower CTR; verify circuit margin requirements
Output Type	Transistor with Base	Transistor with Base	Match
Voltage - Output (Max)	30V	30V	Match
Current - Output / Channel	150mA	150mA	Match
Vce Saturation (Max)	400mV	400mV	Match
Operating Temperature Range	-55°C ~ 100°C	-40°C ~ 100°C	Substitute has narrower low-temperature range
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	Match
Mounting Type	Surface Mount	Surface Mount	Match
Product Status	Obsolete	Active	Substitute is actively manufactured

Engineering Selection Recommendations

The MCT5210SM is a qualified substitute for the MCT52003S based on the following engineering criteria:

Mechanical Compatibility: Both components use identical 6-SMD, Gull Wing surface mount packaging, enabling direct PCB footprint compatibility without layout modifications.

Electrical Equivalence: Output stage parameters (voltage, current, saturation voltage) are identical. The substitute maintains the transistor-with-base output configuration required for base-driven applications.

Product Status Advantage: The MCT5210SM is actively manufactured by Fairchild Semiconductor, ensuring long-term availability and supply chain continuity compared to the obsolete MCT52003S.

Isolation Rating Consideration: The MCT5210SM provides 4170Vrms isolation versus the MCT52003S 5300Vrms rating. This substitution is valid for applications where the lower isolation rating is acceptable. Applications requiring 5300Vrms isolation must confirm that 4170Vrms meets system safety and regulatory requirements.

Temperature Range: The MCT5210SM operates from -40°C to 100°C versus -55°C to 100°C for the MCT52003S. Applications requiring operation below -40°C must use the original part or identify alternatives with extended low-temperature ratings.

Current Transfer Ratio: The MCT5210SM specifies 70% CTR minimum at 3mA versus 75% at 10mA for the MCT52003S. Circuit designs must verify adequate drive margin with the lower CTR specification.

Frequently Asked Questions (FAQ)

Q: Can the MCT5210SM be used as a direct replacement for the MCT52003S in all applications?

A: Direct substitution is valid for applications where the 4170Vrms isolation rating is acceptable and operating temperature does not fall below -40°C. Applications with stricter isolation voltage or extended low-temperature requirements must evaluate alternative parts or confirm system compatibility.

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

A: The MCT52003S provides higher isolation voltage (5300Vrms) and extended low-temperature operation (-55°C minimum). The MCT5210SM offers active product status and equivalent output stage performance. Both share identical package, output current, and output voltage specifications.

Q: Are there any PCB layout considerations when substituting the MCT5210SM for the MCT52003S?

A: No layout modifications are required. Both components use the 6-SMD, Gull Wing package with identical pinout and footprint geometry, allowing direct component substitution on existing PCBs.

Q: How does the Current Transfer Ratio difference affect circuit design?

A: The MCT5210SM minimum CTR of 70% at 3mA is lower than the MCT52003S 75% at 10mA. Input drive circuits must provide sufficient LED current to ensure reliable transistor saturation. Verify that the application's input drive capability accommodates the lower CTR specification.

Q: What compliance certifications apply to the MCT5210SM?

A: The MCT5210SM carries ECCN EAR99 and HTSUS 8541.49.8000 classifications, matching the regulatory framework of the MCT52003S.

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