TISP4240F3LM Equivalent & Substitute Parts

Part Overview

The TISP4240F3LM is a Transient Voltage Suppressor (TVS) thyristor manufactured by Bourns Inc., rated for 180V off-state voltage and 120A peak pulse current in the TO-226-2 package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates as a bidirectional overvoltage protection device suitable for transient suppression applications in industrial and consumer electronics.

Substiute Parts

TISP4240F3LM

Bourns Inc.In Stock: 1042TISP4240F3LM Datasheet

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P1500EAL

LittelfuseIn Stock: 20418P1500EAL Datasheet

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P1800EAL

Littelfuse Inc.In Stock: 20221P1800EAL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TISP4240F3LM are selected based on the following critical parameters that determine functional equivalence:

Voltage Rating Compatibility: Off-state voltage must remain within acceptable operating margins. The TISP4240F3LM operates at 180V off-state; substitutes must support comparable voltage suppression thresholds.

Current Handling Capacity: Peak pulse current ratings (8/20µs and 10/1000µs) define the device's ability to clamp transient events. Substitutes must meet or exceed the 120A (8/20µs) specification.

Package and Mounting: Both substitute parts maintain the TO-226-2 / TO-92-2 through-hole package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Hold Current (Ih): The 150mA hold current specification is maintained across all substitute options, ensuring consistent latching behavior.

Number of Elements: Single-element configuration is preserved in all substitutes.

The P1500EAL and P1800EAL from Littelfuse Inc. meet these substitution criteria while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

P1800EAL (Primary Substitute): This Littelfuse SIDACtor® device provides the closest voltage profile to the TISP4240F3LM with 170V off-state and 220V breakover ratings. The P1800EAL maintains identical hold current specifications and package compatibility while offering superior peak pulse current capacity (150A vs. 120A). Active product status ensures long-term availability and supply chain stability. ROHS3 compliance satisfies modern regulatory requirements.

P1500EAL (Secondary Substitute): The P1500EAL operates at a lower voltage threshold (140V off-state, 180V breakover) and is suitable for applications where reduced voltage suppression is acceptable. This device also provides 150A peak pulse current capacity and active product status with ROHS3 compliance. The lower voltage rating makes this option appropriate for lower-voltage transient protection circuits.

Both substitutes are manufactured by Littelfuse Inc., a recognized supplier in the TVS thyristor market, and maintain identical hold current and through-hole package specifications as the original TISP4240F3LM.

Frequently Asked Questions (FAQ)

Q: Can the P1800EAL directly replace the TISP4240F3LM in existing designs?

A: The P1800EAL is mechanically and electrically compatible with the TISP4240F3LM. Both devices use the TO-226-2 package and maintain the same 150mA hold current. The voltage ratings differ slightly (170V vs. 180V off-state), which is acceptable for most transient suppression applications. Circuit validation is required to confirm suitability for specific voltage thresholds.

Q: What is the difference between the P1500EAL and P1800EAL?

A: The primary difference is voltage rating. The P1500EAL operates at 140V off-state with 180V breakover, while the P1800EAL operates at 170V off-state with 220V breakover. Both devices provide 150A peak pulse current and identical hold current. Selection depends on the required voltage suppression threshold for your application.

Q: Are the substitute parts available in the same package as the TISP4240F3LM?

A: Yes. Both P1500EAL and P1800EAL are available in the TO-226-2 / TO-92-2 through-hole package, matching the TISP4240F3LM footprint and mounting requirements.

Q: What compliance advantages do the substitute parts offer?

A: Both Littelfuse substitutes are ROHS3 compliant, whereas the TISP4240F3LM is non-compliant. This compliance status is essential for designs targeting modern regulatory standards and markets with RoHS requirements.

Q: Why is the TISP4240F3LM classified as obsolete?

A: Obsolete status indicates that Bourns Inc. has discontinued production and support for this component. Littelfuse SIDACtor® devices (P1500EAL and P1800EAL) represent active alternatives with equivalent functionality and superior compliance certifications.