MCT2ES Equivalent & Substitute Parts

Part Overview

The MCT2ES is an optoisolator transistor with base output manufactured by onsemi, featuring 5300Vrms isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MCT2ES provides single-channel isolation with transistor output capability, suitable for applications requiring galvanic isolation in DC input circuits.

Key Parameters

Parameter	MCT2ES
Manufacturer	onsemi
Category	Optoisolators
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
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MCT2ES is determined by the following critical parameters:

Functional equivalence: Single-channel optoisolator with transistor output and base connection
Isolation voltage: Minimum 5300Vrms or equivalent peak voltage specification
Output characteristics: Maximum output voltage of 30V, output current of 50mA, and Vce saturation of 400mV
Current transfer ratio: Minimum 20% @ 10mA
Package compatibility: 6-SMD, Gull Wing surface mount configuration
Input type: DC input operation
Operating temperature range: Support for -55°C to 100°C or compatible subset

The MCT2ESM (Fairchild Semiconductor) qualifies as a direct substitute with enhanced isolation voltage (7500Vpk) and active product status. The MCT2ESMT&R (Isocom Components 2004 LTD) is classified as a similar substitute with different isolation voltage specification (7.5Vpk) and alternative packaging format (Tape & Reel).

Parameter Comparison

Parameter	MCT2ES (onsemi)	MCT2ESM (Fairchild)	MCT2ESMT&R (Isocom)
Number of Channels	1	1	1
Voltage - Isolation	5300Vrms	7500Vpk	7.5Vpk
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	50% @ 10mA
Turn On / Turn Off Time (Typ)	1.1µs, 50µs	2µs, 2µs	3µs, 3µs
Input Type	DC	DC	DC
Output Type	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	30V
Current - Output / Channel	50mA	50mA	Not specified
Voltage - Forward (Vf) (Typ)	1.25V	1.25V	1.2V
Current - DC Forward (If) (Max)	100mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Product Status	Obsolete	Active	Active
ECCN	EAR99	EAR99	EAR99

Engineering Selection Recommendations

MCT2ESM (Fairchild Semiconductor) is the primary direct substitute. It maintains functional equivalence with identical output specifications (30V maximum, 50mA output current, 400mV Vce saturation) and matching current transfer ratio (20% @ 10mA). The MCT2ESM offers superior isolation voltage (7500Vpk versus 5300Vrms) and holds active product status, ensuring long-term availability and supply chain stability. The operating temperature range is -40°C to 100°C, which covers the upper portion of the MCT2ES range.

MCT2ESMT&R (Isocom Components 2004 LTD) is a similar substitute with active product status and RoHS3 compliance. This part maintains the 6-SMD, Gull Wing package configuration and supports the full operating temperature range (-55°C to 100°C). However, the isolation voltage specification (7.5Vpk) differs significantly from the MCT2ES baseline. The current transfer ratio is higher (50% @ 10mA), and output current specification is not provided. This part is supplied in Tape & Reel packaging format.

Both substitute parts carry EAR99 ECCN classification and REACH Unaffected status, matching the regulatory profile of the original MCT2ES.

Frequently Asked Questions (FAQ)

Q: Can MCT2ESM directly replace MCT2ES in existing designs?

A: MCT2ESM maintains functional equivalence for the critical output parameters: 30V maximum output voltage, 50mA output current, and 400mV Vce saturation. The minimum current transfer ratio (20% @ 10mA) is identical. The higher isolation voltage (7500Vpk) provides additional margin. The operating temperature range difference (-40°C minimum versus -55°C) must be evaluated against application requirements.

Q: What are the key differences between MCT2ESM and MCT2ESMT&R?

A: MCT2ESM (Fairchild) and MCT2ESMT&R (Isocom) differ in isolation voltage specification (7500Vpk versus 7.5Vpk), current transfer ratio (20% versus 50% @ 10mA), and packaging format (standard versus Tape & Reel). The MCT2ESMT&R does not specify output current capability. Both maintain the 6-SMD, Gull Wing physical package.

Q: Is the 6-SMD, Gull Wing package identical across all three parts?

A: All three parts use 6-SMD, Gull Wing surface mount packaging, ensuring mechanical and footprint compatibility on PCB layouts. Tape & Reel packaging for MCT2ESMT&R refers to the supply format, not the component package itself.

Q: What compliance certifications apply to these substitutes?

A: MCT2ESM carries EAR99 ECCN and HTSUS 8541.49.8000 classification. MCT2ESMT&R adds RoHS3 compliance and maintains Moisture Sensitivity Level 1 (Unlimited), matching the original MCT2ES specifications.

Q: How do the switching characteristics compare?

A: MCT2ES specifies turn-on/turn-off times of 1.1µs and 50µs. MCT2ESM provides 2µs and 2µs respectively, with rise/fall times of 2µs and 1.5µs. MCT2ESMT&R specifies 3µs turn-on and turn-off times. Application timing requirements must be evaluated against these specifications.

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