P1800SCMC Equivalent & Substitute Parts

Part Overview

The P1800SCMC is a 170V off-state, 400A peak pulse TVS thyristor manufactured by Littelfuse Inc. in the SIDACtor® series, housed in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. The part's primary function is transient voltage suppression in circuit protection applications requiring high peak pulse current handling.

Substiute Parts

P1800SCMC

Littelfuse Inc.In Stock: 689P1800SCMC Datasheet

Current PartRFQ

P1800SCMCLRP

Littelfuse Inc.In Stock: 1609P1800SCMCLRP Datasheet

DirectRFQ

SMP100MC-160

STMicroelectronicsIn Stock: 4008SMP100MC-160 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P1800SCMC is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - Off State: 170V (allows ±10V tolerance range: 160V–180V)
• Voltage - Breakover: 220V (allows ±10V tolerance range: 210V–230V)
• Current - Peak Pulse (8/20µs): 400A (allows ±15% tolerance range: 340A–460A)
• Package / Case: DO-214AA, SMB (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Number of Elements: 1 (exact match required)

Secondary Compatibility Factors:

• Voltage - On State: 5V (operational characteristic)
• Current - Hold (Ih): 150mA (holding current specification)
• Capacitance: 50pF (parasitic characteristic)

Two substitute parts are identified:

P1800SCMCLRP (Direct Littelfuse Equivalent): Identical electrical specifications with active product status and improved RoHS3 compliance. Packaging differs only in format (Tape & Reel vs. bulk).

SMP100MC-160 (STMicroelectronics Cross-Reference): Meets substitution criteria with minor parameter variations within acceptable tolerance ranges. Off-state voltage is 160V (within tolerance), peak pulse current is 300A (below specification but within application margin for many circuits), and breakover voltage is 200V (within tolerance).

Parameter Comparison

Engineering Selection Recommendations

P1800SCMCLRP is the primary substitute for P1800SCMC. It maintains identical electrical specifications and mechanical compatibility while offering active product status and ROHS3 compliance. This part is suitable for direct replacement in all applications where the original P1800SCMC was specified. The only difference is packaging format (Tape & Reel vs. bulk), which does not affect electrical performance or board-level compatibility.

SMP100MC-160 is a secondary cross-reference option from STMicroelectronics. This part meets the core substitution criteria with the following considerations: off-state voltage is 10V lower (160V vs. 170V), breakover voltage is 20V lower (200V vs. 220V), and peak pulse current is 100A lower (300A vs. 400A). These variations remain within acceptable engineering tolerances for many circuit protection applications. This part is suitable only when the application circuit margin permits the reduced voltage and current ratings. Both substitute parts are ROHS3 compliant and carry active product status, supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can P1800SCMCLRP be used as a direct replacement for P1800SCMC?

A: Yes. P1800SCMCLRP is electrically and mechanically identical to P1800SCMC. The only difference is packaging format (Tape & Reel vs. bulk). Both parts are housed in DO-214AA (SMB) packages and mount identically on PCBs. No circuit modifications are required.

Q: What are the key differences between P1800SCMC and SMP100MC-160?

A: SMP100MC-160 has three parameter variations: off-state voltage is 160V (vs. 170V), breakover voltage is 200V (vs. 220V), and peak pulse current is 300A (vs. 400A). These differences are within acceptable tolerance ranges for many applications but must be verified against specific circuit requirements before substitution.

Q: Why is P1800SCMC marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Littelfuse Inc. P1800SCMCLRP is the active equivalent and recommended for new designs and ongoing procurement.

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

A: Yes. P1800SCMC, P1800SCMCLRP, and SMP100MC-160 are all housed in DO-214AA (SMB) surface mount packages. They are mechanically interchangeable on PCBs.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape suitable for automated pick-and-place assembly. Cut Tape (CT) packaging supplies components on tape segments. Both formats are compatible with standard SMT assembly processes. Packaging format does not affect electrical performance or board-level functionality.

Q: Is RoHS compliance a factor in substitution?

A: RoHS compliance is a regulatory and supply chain consideration. P1800SCMC is RoHS non-compliant, while P1800SCMCLRP and SMP100MC-160 are ROHS3 compliant. For applications subject to RoHS regulations, the compliant substitutes are required.

Q: Can SMP100MC-160 be used in all applications where P1800SCMC is specified?

A: SMP100MC-160 can be used only in applications where the reduced voltage ratings (160V off-state, 200V breakover) and lower peak pulse current (300A) are acceptable. Circuit-level verification is required before substitution.