SP1105-01UTG Equivalent & Substitute Parts

Part Overview

The SP1105-01UTG is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 5V reverse standoff voltage with a 10.9V typical clamping voltage and 70A peak pulse current capability in a compact 2-DFN (1.6x1) package. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

SP1105-01UTG

LittelfuseIn Stock: 9391SP1105-01UTG Datasheet

Current PartRFQ

SP1105S-01UTG

Littelfuse Inc.In Stock: 3498SP1105S-01UTG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SP1105-01UTG is determined by strict equivalence across the following critical parameters:

• Reverse standoff voltage: 5V (Max)
• Package type: 2-DFN (1.6x1) surface mount
• Unidirectional channel configuration: 1 channel
• Operating temperature range: -40°C ~ 125°C
• RoHS3 compliance and MSL rating

The SP1105S-01UTG qualifies as a direct substitute based on identical reverse standoff voltage, package geometry, mounting type, and environmental specifications. Variations in clamping voltage (9.2V vs. 10.9V) and peak pulse current (80A vs. 70A) remain within acceptable tolerance for general-purpose TVS applications where the primary function is transient suppression at the specified voltage threshold.

Parameter Comparison

Engineering Selection Recommendations

The SP1105S-01UTG is the qualified substitute for the obsolete SP1105-01UTG. Both components maintain identical reverse standoff voltage specifications and package geometry, ensuring direct mechanical and electrical compatibility in existing PCB layouts. The SP1105S-01UTG carries active product status with full manufacturer support, ROHS3 compliance, and unlimited moisture sensitivity rating, making it suitable for new designs and legacy system updates. The marginal differences in clamping voltage and peak pulse current do not compromise the protective function in general-purpose transient suppression applications where the 5V threshold is the primary design criterion.

Frequently Asked Questions (FAQ)

Q: Can SP1105S-01UTG be used as a direct replacement for SP1105-01UTG in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (5V), package type (2-DFN 1.6x1), mounting configuration (surface mount), and operating temperature range (-40°C ~ 125°C). PCB layout and footprint modifications are not required.

Q: What are the differences between these two parts?

A: The SP1105S-01UTG exhibits a lower clamping voltage (9.2V vs. 10.9V) and higher peak pulse current capability (80A vs. 70A). These variations do not affect substitution validity for general-purpose TVS applications where voltage threshold matching is the primary requirement.

Q: Why is the SP1105-01UTG classified as obsolete?

A: Product obsolescence is determined by the manufacturer and typically reflects end-of-life status. The SP1105S-01UTG provides continued availability with active product support.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). No compliance barriers exist for substitution.

Q: What package considerations apply to this substitution?

A: Both components use identical 2-DFN (1.6x1) surface-mount packaging. No rework or PCB redesign is necessary for component replacement.