SL15T3 Equivalent & Substitute Parts

Part Overview

The SL15T3 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in SOT-23-3 packaging. This component provides 15V reverse standoff voltage with 30V maximum clamping voltage and 5A peak pulse current capability. The SL15T3 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Substiute Parts

SL15T3

onsemiIn Stock: 1108SL15T3 Datasheet

Current PartRFQ

SL15T1G

onsemiIn Stock: 20766SL15T1G Datasheet

DirectRFQ

SL15.TCT

Semtech CorporationIn Stock: 17953SL15.TCT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SL15T3 are qualified based on the following electrical and mechanical parameters:

• Voltage - Reverse Standoff: 15V nominal
• Voltage - Breakdown (Min): 16.7V
• Voltage - Clamping (Max) @ Ipp: 30V
• Current - Peak Pulse: 5A (8/20µs)
• Power - Peak Pulse: 300W
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Two active substitute parts meet these electrical specifications while maintaining identical mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

SL15T1G (onsemi) is the primary recommended substitute for the obsolete SL15T3. Both parts are manufactured by onsemi, carry identical electrical specifications, and maintain automotive-grade qualification with AEC-Q101 certification. The SL15T1G is in active production status with higher inventory availability (20,662 pcs) and achieves ROHS3 compliance, addressing environmental regulatory requirements that the original SL15T3 does not meet.

SL15.TCT (Semtech Corporation) provides an alternative substitute with equivalent electrical performance and identical mechanical compatibility. This part is also in active production and ROHS3 compliant. The SL15.TCT exhibits slightly higher capacitance (5pF vs. 4.6pF @ 1MHz) and operates within a reduced temperature range (-55°C ~ 125°C vs. -55°C ~ 150°C). Selection of this part should account for the lower maximum operating temperature if the application requires operation above 125°C.

Frequently Asked Questions (FAQ)

Q: Can SL15T1G directly replace SL15T3 in existing designs?

A: Yes. The SL15T1G maintains identical electrical specifications (15V standoff, 30V clamping, 5A peak pulse current, 300W peak power) and mechanical compatibility (SOT-23-3 package, surface mount). Both parts are automotive-grade with AEC-Q101 qualification.

Q: What is the primary difference between SL15T1G and SL15.TCT?

A: Both parts meet the electrical requirements for SL15T3 substitution. The SL15T1G is manufactured by onsemi (original manufacturer) and operates to 150°C. The SL15.TCT is manufactured by Semtech Corporation and operates to 125°C maximum. The SL15.TCT exhibits 5pF capacitance versus 4.6pF for the SL15T1G at 1MHz.

Q: Are there packaging differences between these substitutes?

A: All three parts use identical SOT-23-3 (TO-236-3, SC-59) surface mount packaging. SL15T1G is available in Cut Tape and Digi-Reel packaging. SL15.TCT is supplied in Tape & Reel format.

Q: Does the capacitance difference between SL15T1G and SL15.TCT affect circuit performance?

A: The capacitance difference (4.6pF vs. 5pF @ 1MHz) is within typical TVS diode variation and does not affect the primary voltage suppression function. Applications sensitive to parasitic capacitance should evaluate both parts against specific circuit requirements.

Q: Why is RoHS compliance important for this substitution?

A: The original SL15T3 is RoHS non-compliant. Both active substitutes (SL15T1G and SL15.TCT) achieve ROHS3 compliance, meeting current environmental and regulatory standards for electronic component procurement and end-of-life management.