SMP100LC-120 Equivalent & Substitute Parts

Part Overview

The SMP100LC-120 is a 120V off-state transient voltage suppressor thyristor manufactured by STMicroelectronics in the TRISIL™ series. This component is rated for 400 A peak pulse current (8/20µs) and is housed in a DO-214AA (SMB) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMP100LC-120

STMicroelectronicsIn Stock: 27641SMP100LC-120 Datasheet

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P1300SCLRP

Littelfuse Inc.In Stock: 17137P1300SCLRP Datasheet

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TISP4145J1BJR-S

Bourns Inc.In Stock: 2302TISP4145J1BJR-S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMP100LC-120 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Off State: 120V (exact match required)
• Package / Case: DO-214AA, SMB (mechanical compatibility)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• Number of Elements: 1 (functional equivalence)
• RoHS Status: ROHS3 Compliant (regulatory compliance)

Secondary Compatibility Parameters:

• Voltage - Breakover: 150V nominal (acceptable range: 145V–160V)
• Current - Peak Pulse (8/20µs): 400A nominal (acceptable range: 400A–800A)
• Current - Hold (Ih): 150mA nominal (acceptable range: 20mA–150mA)

The substitute parts P1300SCLRP and TISP4145J1BJR-S meet the primary criteria and fall within acceptable ranges for secondary parameters. Both are active products with current manufacturing status and full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

P1300SCLRP (Littelfuse Inc.) - SIDACtor® Series

This substitute provides direct electrical equivalence to the SMP100LC-120. The 120V off-state voltage, 400A peak pulse current (8/20µs), and 150mA hold current match the original specification exactly. The breakover voltage of 160V is within acceptable tolerance. The part is active in production with ROHS3 compliance and REACH unaffected status. Packaging is DO-214AA, SMB with surface mount compatibility. This part is suitable for direct replacement in applications requiring identical electrical performance.

TISP4145J1BJR-S (Bourns Inc.)

This substitute offers enhanced current handling capability with 800A peak pulse current (8/20µs) and 200A peak pulse current (10/1000µs), compared to the original 400A and 100A specifications. The 120V off-state voltage and DO-214AA, SMB package maintain mechanical compatibility. The breakover voltage of 145V is within acceptable range. The hold current is significantly lower at 20mA. This part is active in production with ROHS3 compliance. REACH status is affected. This part is suitable for applications where higher transient current capacity is beneficial or required.

Both substitutes are ROHS3 compliant and maintain the DO-214AA, SMB package form factor. Selection between them depends on whether exact current specification matching (P1300SCLRP) or enhanced current capacity (TISP4145J1BJR-S) is required for the application.

Frequently Asked Questions (FAQ)

Q: Can P1300SCLRP be used as a direct replacement for SMP100LC-120?

A: Yes. The P1300SCLRP maintains identical off-state voltage (120V), peak pulse current (400A at 8/20µs), and hold current (150mA). The package, mounting type, and regulatory compliance are equivalent. The breakover voltage of 160V is within acceptable tolerance of the original 150V specification.

Q: What is the primary difference between P1300SCLRP and TISP4145J1BJR-S?

A: The TISP4145J1BJR-S has double the peak pulse current capacity (800A at 8/20µs versus 400A) and significantly lower hold current (20mA versus 150mA). Both maintain the 120V off-state voltage and DO-214AA, SMB package. Selection depends on whether the application requires exact current matching or can benefit from higher transient capacity.

Q: Are all three parts housed in the same package?

A: Yes. The SMP100LC-120, P1300SCLRP, and TISP4145J1BJR-S are all housed in the DO-214AA (SMB) surface mount package. They are mechanically interchangeable on PCB layouts designed for this package.

Q: What is the significance of the breakover voltage differences?

A: The SMP100LC-120 has a 150V breakover voltage, P1300SCLRP has 160V, and TISP4145J1BJR-S has 145V. These variations fall within acceptable tolerance for TVS thyristor applications. The off-state voltage of 120V is the critical parameter for circuit protection, and all three parts match this specification.

Q: Are there any regulatory compliance differences between the substitutes?

A: Both substitutes are ROHS3 compliant with MSL rating of 1 (Unlimited). The P1300SCLRP has REACH unaffected status, while the TISP4145J1BJR-S has REACH affected status. For applications subject to REACH restrictions, P1300SCLRP is the appropriate choice.

Q: What does the capacitance variation (75pF to 120pF) mean for circuit design?

A: The capacitance values provided are inherent to each device design. The SMP100LC-120 has 75pF, P1300SCLRP has 105pF, and TISP4145J1BJR-S has 120pF. These variations are within normal manufacturing tolerances for TVS thyristors and do not typically require circuit redesign for standard transient suppression applications.

Q: Why is the SMP100LC-120 marked as obsolete?

A: The SMP100LC-120 is classified as obsolete by STMicroelectronics, indicating it is no longer in active production. The listed substitutes (P1300SCLRP and TISP4145J1BJR-S) are active products from alternative manufacturers and provide equivalent or enhanced functionality for new designs and production continuity.