MCR8SD Equivalent & Substitute Parts

Part Overview

The MCR8SD is a Silicon Controlled Rectifier (SCR) rated for 400V, 8A operation in a Through Hole TO-220-3 package. This component is classified as Obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The MCR8SD features a Sensitive Gate design, enabling reliable triggering at low gate current levels suitable for industrial control circuits.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Voltage - Gate Trigger (Vgt) (Max)	1 V
Current - Gate Trigger (Igt) (Max)	200 µA
Voltage - On State (Vtm) (Max)	1.8 V
Current - On State (It (RMS)) (Max)	8 A
Current - Hold (Ih) (Max)	6 mA
Current - Off State (Max)	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80 A @ 60Hz
SCR Type	Sensitive Gate
Operating Temperature Range	-40°C to 110°C
Mounting Type	Through Hole
Package / Case	TO-220-3

Substitute Part Grouping Explanation

Substitution of the MCR8SD is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, MCR8SDG, maintains identical electrical specifications across all critical parameters: 400V off-state voltage, 8A RMS on-state current, 1V maximum gate trigger voltage, and 200µA maximum gate trigger current. Both devices employ Sensitive Gate SCR technology and operate across the same temperature range (-40°C to 110°C). The mechanical interface remains consistent with TO-220-3 package configuration and Through Hole mounting.

The substitution is valid based on the following key parameters:

Voltage rating (400V off-state)
Current rating (8A RMS on-state)
Gate trigger characteristics (1V Vgt, 200µA Igt)
On-state voltage (1.8V Vtm)
Hold current (6mA Ih)
SCR type classification (Sensitive Gate)
Package and mounting configuration (TO-220-3, Through Hole)

Parameter Comparison

Parameter	MCR8SD	MCR8SDG
Manufacturer	onsemi	onsemi
Category	Thyristors	Thyristors
Voltage - Off State	400 V	400 V
Voltage - Gate Trigger (Vgt) (Max)	1 V	1 V
Current - Gate Trigger (Igt) (Max)	200 µA	200 µA
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V
Current - On State (It (RMS)) (Max)	8 A	8 A
Current - Hold (Ih) (Max)	6 mA	6 mA
Current - Off State (Max)	10 µA	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80 A @ 60Hz	80 A @ 60Hz
SCR Type	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C to 110°C	-40°C to 110°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3
Product Status	Obsolete	Active
ECCN	EAR99	EAR99
HTSUS	8541.30.0080	8541.30.0080

Engineering Selection Recommendations

The MCR8SDG is the direct equivalent for MCR8SD applications. Both components are manufactured by onsemi and share identical electrical and mechanical specifications. The primary distinction is product status: MCR8SD is classified as Obsolete, while MCR8SDG maintains Active status with current manufacturing support.

For new designs and production continuity, MCR8SDG is the appropriate selection. Both devices carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications, ensuring regulatory compliance equivalence. The MCR8SDG is available in Bulk packaging with higher inventory levels (2110 Pcs), supporting supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can MCR8SDG directly replace MCR8SD in existing circuits?

A: Yes. MCR8SDG is electrically and mechanically equivalent to MCR8SD. All critical parameters—voltage ratings, current ratings, gate trigger characteristics, and thermal operating range—are identical. The TO-220-3 package configuration ensures direct PCB compatibility.

Q: What is the primary reason for substitution?

A: MCR8SD is classified as Obsolete. MCR8SDG is the active equivalent from the same manufacturer, ensuring continued availability and manufacturing support.

Q: Are there packaging differences between MCR8SD and MCR8SDG?

A: Both devices use TO-220-3 package configuration with Through Hole mounting. MCR8SDG is supplied in Bulk packaging, while MCR8SD packaging information was not specified. The physical component form factor remains identical.

Q: Do compliance certifications differ between these parts?

A: No. Both MCR8SD and MCR8SDG carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications, ensuring regulatory equivalence for export and trade purposes.

Q: What are the critical electrical parameters for substitution validation?

A: Substitution is valid when the following parameters match: 400V off-state voltage, 8A RMS on-state current, 1V maximum gate trigger voltage, 200µA maximum gate trigger current, 1.8V maximum on-state voltage, and Sensitive Gate SCR type classification.

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