SCT151B-650R Equivalent & Substitute Parts

Part Overview

The SCT151B-650R is a Silicon Controlled Rectifier (SCR) rated for 650V off-state voltage with 12A on-state current capacity, packaged in TO-220-3 through-hole configuration. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and maintenance applications.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	650	V
Current - On State (It (RMS)) (Max)	12	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Gate Trigger (Igt) (Max)	15	mA
Voltage - On State (Vtm) (Max)	1.6	V
Current - Hold (Ih) (Max)	30	mA
Current - Off State (Max)	10	µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	120	A @ 50Hz
Operating Temperature Range	-40 to 125	°C (TJ)
Package / Case	TO-220-3	-
SCR Type	Standard Recovery	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitution of the obsolete SCT151B-650R is determined by electrical and mechanical parameter equivalence within the SCT151 base product family. The primary substitution criteria are:

Voltage rating: 650V off-state voltage (VDRM)
Current rating: 12A on-state RMS current (It)
Gate trigger characteristics: Vgt ≤ 1.5V, Igt ≤ 15mA
On-state voltage: Vtm ≤ 1.6V
Hold current: Ih ≤ 30mA
Package: TO-220-3 through-hole configuration
SCR type: Standard Recovery

The SCT151C-650R maintains identical electrical specifications and packaging, confirming direct substitution capability within the SCT151 product line.

Parameter Comparison

Parameter	SCT151B-650R (Obsolete)	SCT151C-650R (Active)	Unit
Voltage - Off State	650	650	V
Current - On State (It (RMS)) (Max)	12	12	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	1.5	V
Current - Gate Trigger (Igt) (Max)	15	15	mA
Voltage - On State (Vtm) (Max)	1.6	1.6	V
Current - Hold (Ih) (Max)	30	30	mA
Current - Off State (Max)	10	10	µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	120	120	A @ 50Hz
Operating Temperature Range	-40 to 125	-40 to 125	°C (TJ)
Package / Case	TO-220-3	TO-220-3	-
SCR Type	Standard Recovery	Standard Recovery	-
Mounting Type	Through Hole	Through Hole	-
Product Status	Obsolete	Active	-

Engineering Selection Recommendations

The SCT151C-650R is the direct equivalent for the obsolete SCT151B-650R. Both components share identical electrical specifications and mechanical packaging. The SCT151C-650R maintains active product status with current manufacturing support from SMC Diode Solutions, ensuring supply chain continuity and compliance with ROHS3 and REACH regulations. Selection of the SCT151C-650R eliminates obsolescence risk while preserving all functional and thermal characteristics required for existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SCT151C-650R be used as a direct replacement for the SCT151B-650R?

A: Yes. Both parts are members of the SCT151 base product family with identical voltage ratings (650V), current ratings (12A RMS), gate trigger characteristics, on-state voltage, and TO-220-3 packaging. Electrical and mechanical compatibility is complete.

Q: What is the difference between the SCT151B-650R and SCT151C-650R?

A: The primary difference is product status. The SCT151B-650R is obsolete, while the SCT151C-650R is active. All electrical parameters and packaging specifications are identical.

Q: Are there any compliance or certification differences?

A: Both parts comply with ROHS3 and REACH regulations. The SCT151C-650R maintains current compliance certifications as an active product.

Q: Is the TO-220-3 package identical between both parts?

A: Yes. Both components use the TO-220-3 through-hole package with identical pin configuration and thermal characteristics, ensuring mechanical and thermal compatibility in existing PCB designs.

Q: What inventory status should be considered for procurement?

A: The SCT151C-650R is the recommended selection for new designs and ongoing production due to active product status and current manufacturing availability.

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