MCT6-X009T Optoisolator Equivalent & Substitute Parts

Part Overview

The MCT6-X009T is a 2-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation in 8-SMD surface mount packages. The part is designated as Last Time Buy, indicating end-of-life status. Alternative equivalent parts are necessary for long-term design continuity and ongoing production support.

Key Parameters

Parameter	MCT6-X009T
Manufacturer	Vishay Semiconductor Opto Division
Number of Channels	2
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	30V
Current - Output / Channel	30mA
Vce Saturation (Max)	400mV
Turn On / Turn Off Time (Typ)	3µs, 3µs
Operating Temperature	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MCT6-X009T are grouped based on the following critical parameters that determine functional equivalence:

Number of Channels: Must be 2
Output Type: Must be Transistor
Package / Case: Must be 8-SMD, Gull Wing
Mounting Type: Must be Surface Mount
Voltage - Output (Max): Must be 30V
Current - Output / Channel: Must be 30mA
Vce Saturation (Max): Must be 400mV
Operating Temperature Range: Must be -55°C ~ 100°C
RoHS Status: Must be ROHS3 Compliant
MSL Rating: Must be 1 (Unlimited)

Substitutes are divided into two categories:

Parametric Equivalent (MCT6-X007T): Identical electrical and mechanical specifications to the main part, differing only in manufacturer part number suffix and inventory status.

MFR Recommended Alternatives (onsemi MCT6 Series): Parts from onsemi that maintain core functional parameters (2 channels, transistor output, 8-SMD package, 30V max output, 30mA per channel, 400mV Vce saturation, -55°C to 100°C operation) with variations in isolation voltage (5000Vrms vs 5300Vrms), current transfer ratio, and switching speed.

Parameter Comparison

Parameter	MCT6-X009T	MCT6-X007T	MCT61S	MCT61SD	MCT62S	MCT62SD	MCT6S	MCT6SD
Manufacturer	Vishay	Vishay	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi
Number of Channels	2	2	2	2	2	2	2	2
Voltage - Isolation	5300Vrms	5300Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	50% @ 5mA	50% @ 5mA	100% @ 5mA	100% @ 5mA	20% @ 10mA	20% @ 10mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	2.4µs, 2.4µs	2.4µs, 2.4µs	2.4µs, 2.4µs	2.4µs, 2.4µs	2.4µs, 2.4µs	2.4µs, 2.4µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	30V	30V	30V	30V	30V	30V	30V	30V
Current - Output / Channel	30mA	30mA	30mA	30mA	30mA	30mA	30mA	30mA
Voltage - Forward (Vf) (Typ)	1.25V	1.25V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Last Time Buy	Last Time Buy	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

MCT6-X007T (Vishay): Direct parametric equivalent with identical electrical specifications and Last Time Buy status. Selection is appropriate for designs currently using MCT6-X009T where inventory continuity is the primary concern. Both parts share the same base product number (MCT6) and are from the same manufacturer.

MCT6S / MCT6SD (onsemi): Functionally compatible substitutes with Active product status. These parts maintain the 20% minimum current transfer ratio @ 10mA specification matching the original MCT6-X009T. Isolation voltage is reduced to 5000Vrms (300V lower than the original). Switching speed is improved (2.4µs vs 3µs). Selection is appropriate for new designs or long-term production where active manufacturer support is required.

MCT61S / MCT61SD (onsemi): Compatible substitutes with Active product status and improved current transfer ratio (50% @ 5mA). Isolation voltage is 5000Vrms. Switching speed is 2.4µs. Selection is appropriate when higher current transfer ratio performance is beneficial within the application constraints.

MCT62S / MCT62SD (onsemi): Compatible substitutes with Active product status and maximum current transfer ratio (100% @ 5mA). Isolation voltage is 5000Vrms. Switching speed is 2.4µs. Selection is appropriate for applications requiring the highest current transfer ratio performance.

All onsemi alternatives provide ROHS3 compliance, MSL 1 rating, and identical package/mounting specifications. The primary design consideration is the 300Vrms reduction in isolation voltage for onsemi parts compared to the Vishay MCT6-X009T.

Frequently Asked Questions (FAQ)

Q: Can MCT6-X007T be used as a direct replacement for MCT6-X009T?

A: Yes. MCT6-X007T is a parametric equivalent with identical electrical and mechanical specifications. Both are Vishay products with Last Time Buy status and share the same base product number.

Q: What is the key difference between Vishay MCT6-X009T and onsemi MCT6S?

A: The primary difference is isolation voltage: MCT6-X009T provides 5300Vrms while MCT6S provides 5000Vrms. Both maintain 2 channels, transistor output, 30V max output, 30mA per channel, 400mV Vce saturation, and -55°C to 100°C operation. onsemi MCT6S has Active product status versus Last Time Buy for the Vishay part.

Q: Why do onsemi MCT61S and MCT62S have different current transfer ratios?

A: Current transfer ratio is a specified performance characteristic. MCT61S specifies 50% @ 5mA while MCT62S specifies 100% @ 5mA. Both are compatible with the MCT6-X009T package and pin configuration. Selection depends on application requirements for LED drive current efficiency.

Q: Are packaging options different between substitute parts?

A: Packaging format differs. MCT6-X009T and MCT6-X007T are supplied in Tape & Reel (TR). onsemi MCT6S and MCT61S are supplied in Tube. onsemi MCT6SD, MCT61SD, and MCT62SD are supplied in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel. All maintain identical 8-SMD, Gull Wing physical package specifications.

Q: Is the 300Vrms isolation voltage difference between Vishay and onsemi parts significant?

A: The difference is specified in the datasheets. Applications designed for 5300Vrms isolation should be evaluated for compatibility with 5000Vrms isolation. The onsemi parts remain suitable for most industrial isolation applications within the 5000Vrms specification.

Q: Can I mix different substitute parts in the same production run?

A: All listed substitutes maintain identical pin configuration, package dimensions, and core electrical parameters (2 channels, transistor output, 30V max, 30mA per channel, 400mV Vce saturation, -55°C to 100°C operation). Mixing is permissible provided the application does not require the specific isolation voltage or current transfer ratio of a particular part.

Q: What is the product status significance?

A: MCT6-X009T and MCT6-X007T are Last Time Buy, indicating Vishay will discontinue these parts. onsemi MCT6S, MCT6SD, MCT61S, MCT61SD, MCT62S, and MCT62SD are Active products with ongoing manufacturer support and availability.

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