CS3P-40PB Equivalent & Substitute Parts

Part Overview

The CS3P-40PB is a Silicon Controlled Rectifier (SCR) rated for 1.2 kV off-state voltage with 40 A on-state current capacity in a TO3 through-hole package. Manufactured by Central Semiconductor Corp, this component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations.

Substiute Parts

CS3P-40PB

Central Semiconductor CorpIn Stock: 1130CS3P-40PB Datasheet

Current PartRFQ

CLA80MT1200NHR

IXYSIn Stock: 1015CLA80MT1200NHR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CLA80MT1200NHR represents a functional alternative based on the following substitution criteria:

Matching Parameters:

• Voltage - Off State: 1.2 kV (identical)
• Mounting Type: Through Hole (identical)
• Operating Temperature Range: -55°C to 150°C (exceeds original range)

Critical Consideration: The CLA80MT1200NHR is a TRIAC device, not an SCR. While both are thyristor-based semiconductor switches operating at 1.2 kV, they have fundamentally different switching characteristics. TRIACs conduct in both directions and are typically used for AC applications, whereas SCRs conduct in one direction and are used for DC applications. This substitution is valid only in applications where bidirectional switching and AC operation are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The CLA80MT1200NHR is available as an active product with current manufacturing support and ROHS3 compliance, addressing the obsolescence status of the CS3P-40PB. The substitute device provides higher current capacity (88 A versus 40 A) and an extended operating temperature range (-55°C to 150°C versus -40°C to 125°C).

Device selection depends on application requirements. The CLA80MT1200NHR's higher gate trigger current (70 mA versus 6 mA) and voltage (1.7 V versus 1.5 V) require gate drive circuit adjustment. The package transition from TO3 to TO-247-3 necessitates PCB layout modification. The fundamental difference between SCR (unidirectional) and TRIAC (bidirectional) operation must be evaluated against the original circuit topology.

Frequently Asked Questions (FAQ)

Q: Can the CLA80MT1200NHR directly replace the CS3P-40PB without circuit modification?

A: Physical mounting requires PCB redesign due to package change from TO3 to TO-247-3. Gate drive circuitry must be adjusted for the higher gate trigger voltage (1.7 V) and current (70 mA). The TRIAC's bidirectional conduction differs fundamentally from the SCR's unidirectional operation.

Q: What is the primary difference between an SCR and a TRIAC?

A: An SCR (Silicon Controlled Rectifier) conducts current in one direction only and is used in DC applications. A TRIAC conducts in both directions and is used in AC applications. Both devices are thyristors controlled by a gate signal.

Q: Does the CLA80MT1200NHR meet the same voltage specifications?

A: Both devices are rated for 1.2 kV off-state voltage. The CLA80MT1200NHR has a slightly higher gate trigger voltage (1.7 V maximum versus 1.5 V maximum).

Q: Is the higher current rating of the CLA80MT1200NHR (88 A versus 40 A) a concern?

A: Higher current rating indicates greater capacity and does not create compatibility issues. The device will operate safely at the original 40 A specification. Thermal management design should account for the specific package characteristics of the TO-247-3.

Q: What compliance advantages does the CLA80MT1200NHR offer?

A: The CLA80MT1200NHR is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The CS3P-40PB's compliance status is not specified.