NP3500SBMCT3G Equivalent & Substitute Parts

Part Overview

The NP3500SBMCT3G is a Transient Voltage Suppressor (TVS) thyristor manufactured by onsemi, rated for 320V off-state voltage with 250A peak pulse current in a DO-214AA surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and mechanical form factor to ensure reliable circuit protection without redesign.

Substiute Parts

NP3500SBMCT3G

onsemiIn Stock: 1191NP3500SBMCT3G Datasheet

Current PartRFQ

P3500SBLRP

Littelfuse Inc.In Stock: 55437P3500SBLRP Datasheet

DirectRFQ

P3500SCMCLRP

Littelfuse Inc.In Stock: 2242P3500SCMCLRP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the NP3500SBMCT3G are classified based on electrical parameter compatibility within the TVS thyristor category. The primary substitution criteria are:

Direct Equivalent (Electrical Match): P3500SBLRP maintains identical voltage ratings (400V breakover, 320V off-state), current specifications (250A peak pulse at 8/20µs, 80A at 10/1000µs), and hold current (150mA). Package and mounting type are identical (DO-214AA, SMB surface mount). This part qualifies as a direct substitute with active product status and full RoHS3 compliance.

Similar Substitute (Enhanced Current Rating): P3500SCMCLRP shares the same voltage parameters (400V breakover, 320V off-state) and package form factor but provides increased peak pulse current capability (400A at 8/20µs, 100A at 10/1000µs). This part is suitable for applications requiring higher transient current handling within the same voltage protection window. On-state voltage is slightly elevated at 5V versus 4V.

Both substitute parts are manufactured by Littelfuse Inc. under the SIDACtor® series designation and maintain the same mechanical compatibility and environmental compliance as the original component.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: P3500SBLRP is the primary substitute for NP3500SBMCT3G. Both parts maintain identical electrical specifications across all critical parameters: voltage ratings, peak pulse current, and hold current. The P3500SBLRP carries active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Inventory availability (55,400 units) supports production continuity.

For Enhanced Performance Applications: P3500SCMCLRP is suitable when circuit design permits higher transient current absorption. The 400A peak pulse rating (versus 250A) provides additional margin for surge events while maintaining the same voltage protection window. The 5V on-state voltage and 40pF capacitance represent minor parameter shifts that must be evaluated against specific circuit requirements. This part is also ROHS3 compliant with active status.

Both Littelfuse substitutes are REACH unaffected and carry identical ECCN and HTSUS classifications as the original component, supporting regulatory and procurement consistency.

Frequently Asked Questions (FAQ)

Q: Can P3500SBLRP be used as a direct drop-in replacement for NP3500SBMCT3G?

A: Yes. P3500SBLRP maintains identical electrical specifications (400V breakover, 320V off-state, 250A peak pulse current, 150mA hold current) and package form factor (DO-214AA, SMB). No circuit modifications are required.

Q: What is the difference between P3500SBLRP and P3500SCMCLRP?

A: Both parts share identical voltage ratings and package specifications. P3500SCMCLRP provides higher peak pulse current capability (400A versus 250A at 8/20µs) and slightly elevated on-state voltage (5V versus 4V). Selection depends on transient current requirements in the application.

Q: Are the Littelfuse substitutes compatible with existing PCB layouts?

A: Yes. Both P3500SBLRP and P3500SCMCLRP use the DO-214AA (SMB) package with identical mechanical dimensions and pin configuration, ensuring compatibility with existing surface mount assembly processes and PCB footprints.

Q: What is the impact of increased capacitance in the Littelfuse parts?

A: Littelfuse substitutes specify 40pF capacitance compared to 29pF in the original NP3500SBMCT3G. This 11pF difference may affect high-frequency circuit behavior. Evaluate impact based on circuit bandwidth and signal integrity requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both P3500SBLRP and P3500SCMCLRP are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: Which substitute should be selected for new designs?

A: P3500SBLRP is recommended for new designs requiring direct electrical equivalence to NP3500SBMCT3G. P3500SCMCLRP is appropriate when circuit design specifications permit or require higher transient current handling within the same voltage protection class.