P1200SB Equivalent & Substitute Parts

Part Overview

The P1200SB is a Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse Inc., designed for overvoltage protection in surface-mount applications. This component operates at 100V off-state voltage with a peak pulse current rating of 250A (8/20µs). The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

P1200SB

Littelfuse Inc.In Stock: 30265P1200SB Datasheet

Current PartRFQ

P1200SBLRP

Littelfuse Inc.In Stock: 30148P1200SBLRP Datasheet

DirectRFQ

SMTPA100

STMicroelectronicsIn Stock: 2380SMTPA100 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P1200SB is determined by matching the following critical parameters:

• Voltage rating (Off-State: 100V, Breakover: 130V range)
• Package type (DO-214AA, SMB surface mount)
• Peak pulse current capability (8/20µs waveform)
• On-state voltage and hold current characteristics
• Single-element configuration

Two substitute parts meet these criteria with varying levels of parameter alignment and product status.

Parameter Comparison

Engineering Selection Recommendations

P1200SBLRP is the primary direct substitute for P1200SB. Both parts are manufactured by Littelfuse Inc. within the SIDACtor® series and maintain identical electrical specifications across all critical parameters: 100V off-state voltage, 130V breakover voltage, 250A peak pulse current (8/20µs), and 120mA hold current. The P1200SBLRP is currently in active production status, whereas the P1200SB is obsolete. The P1200SBLRP is supplied in Tape & Reel packaging, suitable for automated assembly processes. Both parts are RoHS non-compliant and ROHS3 compliant respectively; verify RoHS requirements for your application.

SMTPA100 is a manufacturer-recommended alternative from STMicroelectronics (TRISIL™ series). This part maintains the same 100V off-state voltage and DO-214AA package footprint. However, the peak pulse current rating is reduced to 150A (8/20µs) compared to 250A for the P1200SB. The breakover voltage is 133V (within acceptable tolerance), and hold current is specified at 150mA versus 120mA. Capacitance is lower at 35pF. The SMTPA100 is active in production and ROHS3 compliant. Selection of SMTPA100 requires verification that the reduced peak pulse current (150A versus 250A) is acceptable for the intended application.

Frequently Asked Questions (FAQ)

Q: Can P1200SBLRP be used as a direct replacement for P1200SB?

A: Yes. P1200SBLRP is electrically and mechanically identical to P1200SB across all specified parameters. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). Both are Littelfuse SIDACtor® components with matching voltage ratings, current ratings, and DO-214AA package specifications.

Q: What are the limitations of using SMTPA100 as a substitute?

A: SMTPA100 has a reduced peak pulse current rating of 150A (8/20µs) compared to 250A for P1200SB. Applications requiring the full 250A pulse current capability cannot use SMTPA100. The breakover voltage (133V) is slightly higher, and hold current (150mA) is higher than the original part. Verify these differences against your circuit requirements before selection.

Q: Are all substitute parts RoHS compliant?

A: P1200SB is RoHS non-compliant. P1200SBLRP is ROHS3 compliant. SMTPA100 is ROHS3 compliant. Confirm RoHS compliance requirements for your application and supply chain before finalizing part selection.

Q: Do the substitute parts use the same package footprint?

A: Yes. All three parts use the DO-214AA (SMB) surface-mount package. PCB footprints are compatible. Packaging format differs (bulk, Tape & Reel, Cut Tape & Digi-Reel®), but this affects procurement and assembly processes, not board-level compatibility.

Q: What is the difference between P1200SB and P1200SBLRP packaging?

A: P1200SB is supplied in bulk packaging. P1200SBLRP is supplied in Tape & Reel (TR) format, which is standard for automated pick-and-place assembly. Both contain identical components; the difference is in delivery and handling format.