TISP4145M3LM Equivalent & Substitute Parts

Part Overview

The TISP4145M3LM is a 120V off-state thyristor transient voltage suppressor manufactured by Bourns Inc., designed for transient overvoltage protection in TO-226-2 and TO-92-2 package configurations. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers 220 A peak pulse current (8/20µs) with a 145V breakover voltage and 3V on-state voltage, suitable for applications requiring high-current transient suppression.

Substiute Parts

TISP4145M3LM

Bourns Inc.In Stock: 1203TISP4145M3LM Datasheet

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P1300EAL

Littelfuse Inc.In Stock: 20403P1300EAL Datasheet

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P1300EBL

Littelfuse Inc.In Stock: 20357P1300EBL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TISP4145M3LM is determined by the following critical parameters:

• Off-State Voltage: Must be 120V to maintain circuit protection thresholds
• Package / Case: Must be TO-226-2 or TO-92-2 to ensure mechanical and electrical compatibility
• Mounting Type: Must be Through Hole for PCB integration compatibility
• Current - Hold (Ih): Must be 150 mA to ensure proper thyristor latching behavior
• Number of Elements: Must be 1 for single-element protection

The substitute parts P1300EAL and P1300EBL from Littelfuse Inc. meet these core substitution criteria. Both parts maintain the 120V off-state voltage, identical hold current, and compatible package configurations. Variations in peak pulse current ratings (150A and 250A respectively) and breakover voltage (160V) represent acceptable parameter ranges within the TVS thyristor category for this application class.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The TISP4145M3LM is obsolete, while both P1300EAL and P1300EBL are active products with confirmed inventory availability (20,300 units each). This status difference necessitates substitution for ongoing production.

Compliance Status: P1300EAL and P1300EBL are RoHS3 compliant, whereas the TISP4145M3LM is RoHS non-compliant. Both substitute parts maintain REACH Unaffected status and EAR99 ECCN classification, matching the original part's regulatory profile.

Current Rating Selection: P1300EAL provides 150A peak pulse current (8/20µs), which is lower than the original 220A rating. P1300EBL provides 250A peak pulse current (8/20µs), which exceeds the original specification. Selection between these substitutes depends on circuit current requirements: P1300EAL for applications tolerating reduced current capacity, P1300EBL for applications requiring equal or greater current handling.

Voltage Characteristics: Both substitutes operate at 160V breakover voltage compared to the original 145V. This 15V increase in breakover threshold represents a parameter variance within the TVS thyristor category. On-state voltage increases from 3V to 4V, a 1V difference with minimal impact on circuit performance.

Frequently Asked Questions (FAQ)

Q: Can P1300EAL and P1300EBL be used interchangeably with TISP4145M3LM?

A: Both parts are direct substitutes based on matching off-state voltage (120V), hold current (150 mA), package configuration (TO-226-2, TO-92-2), and mounting type (Through Hole). Selection between P1300EAL and P1300EBL depends on circuit peak pulse current requirements: P1300EAL for 150A applications, P1300EBL for 250A applications.

Q: What is the impact of the 15V breakover voltage difference?

A: The substitute parts trigger at 160V breakover compared to the original 145V. This represents a 10.3% increase in trigger threshold. Circuit design must accommodate this variance in transient suppression activation point.

Q: Are the substitute parts compatible with existing PCB layouts?

A: Yes. Both P1300EAL and P1300EBL use identical TO-226-2 and TO-92-2 package configurations with Through Hole mounting, ensuring direct PCB footprint compatibility with the TISP4145M3LM.

Q: What is the significance of the capacitance difference?

A: The original part specifies 65pF capacitance. P1300EAL provides 45pF and P1300EBL provides 60pF. These variations affect high-frequency transient response characteristics. Applications sensitive to capacitive loading should evaluate this parameter against circuit requirements.

Q: Why is RoHS compliance important for this substitution?

A: The original TISP4145M3LM is RoHS non-compliant, while both substitute parts are RoHS3 compliant. For new designs and production environments with RoHS requirements, the Littelfuse substitutes provide regulatory compliance alignment.