CTB12-1200SW Equivalent & Substitute Parts

Part Overview

The CTB12-1200SW 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 essential for ongoing system support and new design implementations.

The primary reason for identifying substitute parts is the discontinued status of the original component. Active alternatives with matching electrical specifications and package compatibility ensure design continuity and supply chain reliability.

Substiute Parts

CTB12-1200SW

Sensata-CrydomIn Stock: 890CTB12-1200SW Datasheet

Current PartRFQ

TXDV1212RG

STMicroelectronicsIn Stock: 10328TXDV1212RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CTB12-1200SW is determined by the following critical parameters:

• Voltage - Off State: 1.2 kV (exact match required)
• Current - On State (It (RMS)) (Max): 12 A (exact match required)
• Package / Case: TO-220-3 (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -40°C ~ 125°C (exact match required)

The TXDV1212RG from STMicroelectronics meets all mandatory substitution criteria. While classified as a Standard TRIAC rather than Logic - Sensitive Gate, it maintains identical voltage, current, and thermal specifications. Differences in gate trigger parameters (Vgt: 1.5 V vs. 1.3 V; Igt: 100 mA vs. 10 mA; Ih: 100 mA vs. 15 mA) reflect the distinction between gate sensitivity classifications but do not prevent functional substitution in applications where the standard gate characteristics are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The TXDV1212RG is the qualified substitute for the CTB12-1200SW based on the following factors:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance meets current regulatory requirements for electronic components
• Identical voltage, current, and thermal specifications maintain system performance parameters
• TO-220AB package compatibility enables direct mechanical and electrical integration
• REACH Unaffected status confirms regulatory alignment with the original component

The transition from Logic - Sensitive Gate to Standard TRIAC classification requires circuit-level evaluation to confirm gate drive compatibility. Applications utilizing low-level gate drive signals may require circuit modification to accommodate the higher gate trigger requirements of the standard device.

Frequently Asked Questions (FAQ)

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

A: Direct mechanical and thermal replacement is possible due to identical TO-220AB packaging and thermal specifications. However, gate drive circuit compatibility must be evaluated. The TXDV1212RG requires higher gate trigger voltage (1.5 V vs. 1.3 V) and current (100 mA vs. 10 mA), which may necessitate gate drive circuit adjustments depending on the original design.

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

A: Logic - Sensitive Gate TRIACs are designed for low-level gate drive signals, requiring minimal gate current and voltage for triggering. Standard TRIACs have higher gate trigger thresholds and are suitable for applications with conventional gate drive circuits. The TXDV1212RG's standard classification reflects these higher trigger requirements.

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

A: The non-repetitive surge current ratings are nearly identical. The CTB12-1200SW specifies 120A and 126A for 50 and 60 Hz respectively, while the TXDV1212RG specifies 120A and 125A. Both devices provide equivalent surge protection characteristics.

Q: Is the TXDV1212RG available in the same packaging as the CTB12-1200SW?

A: Both devices use TO-220-3 Through Hole packages. The TXDV1212RG is supplied in Tube packaging format, while the original component packaging format is not specified. Both are compatible with standard TO-220 mounting and thermal management solutions.

Q: What compliance certifications should be considered when selecting a substitute?

A: The TXDV1212RG holds ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory standards. The original CTB12-1200SW REACH status is Unaffected, ensuring regulatory alignment between the two components.