Equivalent & Substitute Parts for P1200SARP

Part Overview

The P1200SARP is a 100V off-state, 150A peak pulse TVS thyristor manufactured by Littelfuse Inc. in the SIDACtor® series, housed in a DO-214AA (SMB) surface mount package. This part is classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and procurement continuity. The device functions as a transient voltage suppressor for circuit protection applications requiring high peak pulse current handling.

Substiute Parts

P1200SARP

Littelfuse Inc.In Stock: 4167P1200SARP Datasheet

Current PartRFQ

P1200SALRP

Littelfuse Inc.In Stock: 7925P1200SALRP Datasheet

DirectRFQ

SMTPA100

STMicroelectronicsIn Stock: 2380SMTPA100 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS thyristors is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Parameters:

• Voltage - Off State: Must match or exceed the original specification (100V minimum)
• Voltage - Breakover: Must be within acceptable tolerance of the original (130V nominal)
• Current - Peak Pulse (8/20µs): Must meet or exceed the original requirement (150A minimum)
• Current - Peak Pulse (10/1000µs): Must support the specified pulse profile (45A minimum)
• Current - Hold (Ih): Must be compatible with circuit holding requirements (120mA nominal)
• Voltage - On State: Must remain within acceptable conduction voltage range (4V nominal)

Mechanical Parameters:

• Package / Case: Must be identical (DO-214AA, SMB)
• Mounting Type: Must be Surface Mount
• Capacitance: Should remain within acceptable range for circuit performance (45pF nominal)

Compliance Parameters:

• RoHS Status: Active substitutes should meet current regulatory requirements
• Moisture Sensitivity Level: Must be compatible with assembly and storage conditions (MSL 1)

Two substitute parts meet these criteria: P1200SALRP (direct Littelfuse equivalent) and SMTPA100 (STMicroelectronics manufacturer-recommended alternative).

Parameter Comparison

Engineering Selection Recommendations

P1200SALRP (Littelfuse Inc.) is the direct functional equivalent and primary substitute. This part maintains identical electrical specifications to the original P1200SARP while offering active product status and ROHS3 compliance. The packaging and mounting characteristics are unchanged. This substitute is suitable for direct replacement in existing designs without circuit modification.

SMTPA100 (STMicroelectronics) is the manufacturer-recommended alternative from a different supplier. This part meets all critical electrical requirements with minor parameter variations: breakover voltage is 133V (versus 130V), peak pulse current at 10/1000µs is 50A (versus 45A), holding current is 150mA (versus 120mA), and capacitance is 35pF (versus 45pF). The part maintains identical off-state voltage (100V), peak pulse current at 8/20µs (150A), and package form factor. ROHS3 compliance and active product status are confirmed. These parameter variations remain within acceptable substitution tolerances for TVS thyristor applications.

Both substitutes are available in active production with confirmed inventory levels, providing supply chain continuity for the obsolete P1200SARP.

Frequently Asked Questions (FAQ)

Q: Can P1200SALRP be used as a direct replacement for P1200SARP without circuit changes?

A: Yes. P1200SALRP maintains identical electrical specifications (100V off-state, 130V breakover, 150A peak pulse at 8/20µs, 120mA holding current) and identical package form factor (DO-214AA, SMB). No circuit modifications are required.

Q: What are the key differences between P1200SALRP and SMTPA100?

A: Both parts meet the core electrical requirements. SMTPA100 has a slightly higher breakover voltage (133V versus 130V), higher peak pulse current at 10/1000µs (50A versus 45A), higher holding current (150mA versus 120mA), and lower capacitance (35pF versus 45pF). These variations are within acceptable substitution tolerances for TVS thyristor applications.

Q: Are both substitutes available in the same packaging options?

A: Both P1200SALRP and SMTPA100 are housed in DO-214AA (SMB) surface mount packages. P1200SALRP is available in Cut Tape (CT) packaging, while SMTPA100 is available in both Cut Tape (CT) and Digi-Reel® options.

Q: What is the compliance status of the substitute parts?

A: Both P1200SALRP and SMTPA100 are ROHS3 compliant and REACH unaffected. The original P1200SARP is RoHS non-compliant, making these substitutes suitable for applications requiring current regulatory compliance.

Q: Does the capacitance difference between SMTPA100 (35pF) and the original (45pF) affect circuit performance?

A: Capacitance differences in TVS thyristors are determined by the specific application circuit requirements. The 10pF difference between SMTPA100 and the original specification should be evaluated within the context of the protection circuit design.

Q: Are there any moisture sensitivity concerns with these substitutes?

A: No. All three parts, including the original P1200SARP and both substitutes, have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or assembly.