NP3500SAT3G Equivalent & Substitute Parts

Part Overview

The NP3500SAT3G is a 320V off-state thyristor-based transient voltage suppressor (TVS) in DO-214AA surface mount packaging, manufactured by onsemi. This component is designed for transient overvoltage protection applications requiring 50A peak pulse current capability. The part is currently obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity.

Substiute Parts

NP3500SAT3G

onsemiIn Stock: 2016NP3500SAT3G Datasheet

Current PartRFQ

P3500SALRP

Littelfuse Inc.In Stock: 10202P3500SALRP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS thyristor components is determined by the following critical parameters:

• Voltage Rating Match: Breakover voltage (400V) and off-state voltage (320V) must be identical to ensure proper transient suppression without nuisance triggering
• On-State Voltage: Must remain at 4V to maintain circuit protection characteristics
• Hold Current (Ih): Must match at 150mA for stable device operation
• Package Compatibility: DO-214AA, SMB surface mount package required for PCB layout compatibility
• Element Configuration: Single-element design must be preserved
• Mounting Type: Surface mount requirement must be maintained

The P3500SALRP meets all critical substitution criteria across voltage ratings, hold current, package type, and mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The P3500SALRP (Littelfuse SIDACtor®) is a direct functional substitute for the obsolete NP3500SAT3G. Both components share identical voltage ratings (400V breakover, 320V off-state), on-state voltage (4V), and hold current (150mA), with matching DO-214AA surface mount packaging and MSL rating.

The P3500SALRP offers the advantage of active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The peak pulse current specification differs slightly (45A at 10/1000µs versus 50A), and capacitance is marginally higher (35pF versus 28pF), but these variations remain within acceptable operating parameters for TVS thyristor applications.

Frequently Asked Questions (FAQ)

Q: Can the P3500SALRP directly replace the NP3500SAT3G in existing designs?

A: Yes. Both components share identical voltage ratings, on-state voltage, hold current, and DO-214AA packaging. The P3500SALRP is functionally equivalent for transient suppression applications.

Q: What is the significance of the peak pulse current difference (50A vs. 45A)?

A: The NP3500SAT3G is rated for 50A peak pulse at 10/1000µs, while the P3500SALRP is rated for 45A at the same pulse width. This difference reflects manufacturer test conditions and does not preclude substitution in applications designed for the original 50A specification, provided circuit transient energy remains within acceptable limits.

Q: Does the capacitance difference (28pF vs. 35pF) affect circuit performance?

A: The capacitance increase from 28pF to 35pF is minor and typically does not impact circuit performance in standard TVS applications. Verification may be necessary in high-frequency or sensitive timing-critical circuits.

Q: Is the P3500SALRP available in the same packaging format?

A: Yes. Both components use DO-214AA, SMB surface mount packaging, ensuring identical PCB footprint and assembly compatibility.

Q: What is the product status difference, and why does it matter?

A: The NP3500SAT3G is obsolete, meaning onsemi no longer manufactures or supports this component. The P3500SALRP is active, ensuring continued availability, technical support, and compliance with current regulatory standards including ROHS3.