MCT2E3SD Equivalent & Substitute Parts

Part Overview

The MCT2E3SD is an optoisolator transistor with base output manufactured by onsemi, featuring 5300Vrms isolation voltage and single-channel configuration in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MCT2E3SD provides DC input with transistor output capability, suitable for applications requiring galvanic isolation with moderate current switching requirements.

Key Parameters

Parameter	MCT2E3SD
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the MCT2E3SD is determined by the following critical parameters:

Single-channel configuration: All substitute parts must maintain 1-channel optoisolator architecture
Output type: Transistor with base output is mandatory for functional compatibility
Package compatibility: 6-SMD, Gull Wing surface mount package ensures PCB layout compatibility
Maximum output voltage: 30V maximum output voltage requirement must be met or exceeded
Maximum output current: 50mA per channel minimum capability
Vce saturation: 400mV maximum saturation voltage for switching performance
Input type: DC input requirement must be maintained
Operating temperature range: Minimum -55°C to 100°C coverage required

The MCT2E3SD has two substitute categories: direct manufacturer substitutes (MCT2ESR2VM and MCT2ESM from Fairchild Semiconductor) and similar series alternatives (MCT2ESMT&R from Isocom Components 2004 LTD).

Parameter Comparison

Parameter	MCT2E3SD (onsemi)	MCT2ESR2VM (Fairchild)	MCT2ESM (Fairchild)	MCT2ESMT&R (Isocom)
Product Status	Obsolete	Active	Active	Active
Number of Channels	1	1	1	1
Voltage - Isolation	5300Vrms	7500Vpk	7500Vpk	7.5Vpk
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	20% @ 10mA	50% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	30V	30V
Current - Output / Channel	50mA	50mA	50mA	Not specified
Voltage - Forward (Vf) (Typ)	1.25V	1.25V	1.25V	1.2V
Current - DC Forward (If) (Max)	100mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

MCT2ESR2VM and MCT2ESM (Fairchild Semiconductor): Both parts are active products with enhanced isolation voltage specifications (7500Vpk versus 5300Vrms). These direct substitutes maintain identical output voltage, saturation voltage, and forward voltage characteristics. The primary design consideration is the reduced minimum operating temperature (-40°C versus -55°C), which may require thermal analysis for applications requiring full -55°C operation. Both parts carry EAR99 export classification and HTSUS code 8541.49.8000, matching the original part's compliance profile.

MCT2ESMT&R (Isocom Components 2004 LTD): This part maintains the full -55°C to 100°C operating temperature range and shares the MCT2 base product series designation. However, the isolation voltage specification (7.5Vpk) is significantly lower than the MCT2E3SD requirement, and output current capability is not specified. This part is suitable only for applications where isolation voltage requirements are substantially reduced. The part is supplied in Tape & Reel packaging and carries RoHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can MCT2ESR2VM or MCT2ESM be used as direct replacements for MCT2E3SD?

A: Yes, both Fairchild parts meet the core substitution criteria: single-channel configuration, transistor with base output, 6-SMD Gull Wing package, 30V maximum output voltage, 50mA output current, and 400mV Vce saturation. The higher isolation voltage (7500Vpk) provides additional design margin. The -40°C minimum operating temperature must be verified against application requirements if operation below -40°C is necessary.

Q: What is the key difference between MCT2ESR2VM and MCT2ESM?

A: Both parts are functionally equivalent with identical electrical specifications. MCT2ESR2VM is the tape and reel variant, while MCT2ESM is the standard packaging option. Selection depends on procurement and assembly requirements.

Q: Why is MCT2ESMT&R not recommended as a primary substitute?

A: The MCT2ESMT&R isolation voltage specification (7.5Vpk) is substantially lower than the MCT2E3SD requirement (5300Vrms). This part is suitable only for applications with significantly reduced isolation voltage requirements. Additionally, output current capability is not specified in the available data.

Q: Are there any temperature range limitations when substituting with Fairchild parts?

A: MCT2ESR2VM and MCT2ESM operate from -40°C to 100°C, compared to the MCT2E3SD range of -55°C to 100°C. Applications requiring operation below -40°C must use MCT2ESMT&R or verify that the reduced temperature range is acceptable for the specific design.

Q: Do all substitute parts maintain the same package footprint?

A: Yes, all substitute parts use 6-SMD Gull Wing surface mount packaging, ensuring PCB layout compatibility without redesign.

Q: What compliance certifications apply to these substitute parts?

A: MCT2ESR2VM and MCT2ESM carry EAR99 export classification and HTSUS code 8541.49.8000. MCT2ESMT&R additionally carries RoHS3 compliance certification and maintains REACH Unaffected status.

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