CTB12-1200SWPT Equivalent & Substitute Parts

Part Overview

The CTB12-1200SWPT is a Logic - Sensitive Gate TRIAC manufactured by Sensata-Crydom, rated for 1.2 kV off-state voltage and 12 A on-state current in a Through Hole TO-220AB package. This component is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The sensitive gate configuration requires lower gate trigger current compared to standard TRIAC designs, which is a critical parameter for gate drive circuit compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	1.2	kV
Current - On State (It (RMS)) (Max)	12	A
Voltage - Gate Trigger (Vgt) (Max)	1.3	V
Current - Gate Trigger (Igt) (Max)	10	mA
Current - Hold (Ih) (Max)	15	mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	120A, 126A	A
Operating Temperature Range	-40 to 125	°C (TJ)
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitution of the CTB12-1200SWPT is determined by the following critical parameters:

Voltage - Off State: 1.2 kV (exact match required)
Current - On State: 12 A (exact match required)
Package / Case: TO-220-3 (mechanical and thermal compatibility)
Mounting Type: Through Hole (board layout compatibility)
Operating Temperature Range: -40°C to 125°C (environmental compatibility)

The TXDV1212RG from STMicroelectronics meets these core electrical and mechanical requirements. However, this substitute is classified as a Standard TRIAC rather than a Logic - Sensitive Gate type. This distinction affects gate drive circuit parameters: the substitute requires higher gate trigger current (100 mA maximum versus 10 mA for the original) and higher hold current (100 mA versus 15 mA). Gate drive circuits designed for the sensitive gate configuration must be evaluated for compatibility with the higher gate current requirements of the standard TRIAC substitute.

Parameter Comparison

Parameter	CTB12-1200SWPT (Original)	TXDV1212RG (Substitute)	Match Status
Manufacturer	Sensata-Crydom	STMicroelectronics	Different
Triac Type	Logic - Sensitive Gate	Standard	Different
Voltage - Off State	1.2 kV	1.2 kV	Match
Current - On State (It (RMS)) (Max)	12 A	12 A	Match
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.5 V	Different
Current - Gate Trigger (Igt) (Max)	10 mA	100 mA	Different
Current - Hold (Ih) (Max)	15 mA	100 mA	Different
Current - Non Rep. Surge 50, 60Hz (Itsm)	120A, 126A	120A, 125A	Comparable
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Match
Package / Case	TO-220-3	TO-220-3 Full Pack	Match
Mounting Type	Through Hole	Through Hole	Match
Product Status	Obsolete	Active	Substitute is Active
RoHS Status	Not specified	ROHS3 Compliant	Substitute is compliant

Engineering Selection Recommendations

The TXDV1212RG is the primary substitute for the obsolete CTB12-1200SWPT based on matching voltage and current ratings, identical package form factor, and active product status with current manufacturing support. The substitute maintains ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and system updates.

The primary consideration for substitution is the gate drive circuit compatibility. The original CTB12-1200SWPT requires gate drive circuits designed for sensitive gate operation with maximum 10 mA gate trigger current. The TXDV1212RG substitute requires gate drive circuits capable of delivering up to 100 mA gate trigger current. Existing gate drive circuits must be verified to supply adequate gate current for reliable triggering of the standard TRIAC substitute.

Frequently Asked Questions (FAQ)

Q: Can the TXDV1212RG directly replace the CTB12-1200SWPT without circuit modifications?

A: Direct mechanical and thermal replacement is possible due to identical TO-220-3 packaging and operating temperature ranges. However, gate drive circuit evaluation is required. The substitute requires higher gate trigger current (100 mA maximum) compared to the original sensitive gate design (10 mA maximum). Existing gate drive circuits must be confirmed capable of supplying this higher current.

Q: What is the difference between a Logic - Sensitive Gate TRIAC and a Standard TRIAC?

A: The Logic - Sensitive Gate configuration is optimized for low gate trigger current operation, typically used in circuits with limited gate drive capability. The Standard TRIAC requires higher gate trigger current but offers broader application flexibility. The TXDV1212RG Standard TRIAC requires gate drive circuits with higher current sourcing capability than the original sensitive gate design.

Q: Are there any compliance differences between the original and substitute?

A: The TXDV1212RG substitute is ROHS3 compliant and carries active product status with current manufacturing support. The original CTB12-1200SWPT is classified as Obsolete. Both components are REACH unaffected and carry EAR99 ECCN classification.

Q: What packaging formats are available for the TXDV1212RG?

A: The TXDV1212RG is supplied in Tube packaging with TO-220AB supplier device package designation, maintaining the Through Hole mounting configuration required for board-level compatibility.

Q: Are the surge current ratings equivalent between the two parts?

A: The non-repetitive surge current ratings are comparable. The original CTB12-1200SWPT is rated 120A and 126A for 50 and 60 Hz respectively. The TXDV1212RG substitute is rated 120A and 125A for 50 and 60 Hz respectively, representing negligible practical difference for surge protection circuit design.

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