1KSMB13 Equivalent & Substitute Parts

Part Overview

The 1KSMB13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features an 11.1V reverse standoff voltage with an 18.2V maximum clamping voltage and 54.9A peak pulse current capability in a surface mount DO-214AA (SMB) package. The 1KSMB13 is classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure component availability for new production and field service applications.

Substiute Parts

1KSMB13

Littelfuse Inc.In Stock: 7691KSMB13 Datasheet

Current PartRFQ

1KSMB13A

Taiwan Semiconductor CorporationIn Stock: 301461KSMB13A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB13 is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Substitution):

• Voltage - Reverse Standoff (Typ): 11.1V
• Voltage - Breakdown (Min): 12.4V
• Voltage - Clamping (Max) @ Ipp: 18.2V
• Current - Peak Pulse (10/1000µs): 54.9A
• Power - Peak Pulse: 1000W

Mechanical Parameters (Critical for Substitution):

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

Functional Parameters:

• Transient Voltage Suppression application compatibility

The 1KSMB13A from Taiwan Semiconductor Corporation meets all critical electrical and mechanical parameters, providing direct functional equivalence for the obsolete 1KSMB13.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB13A from Taiwan Semiconductor Corporation is the direct equivalent substitute for the obsolete 1KSMB13 from Littelfuse Inc. All critical electrical parameters, mechanical specifications, and package configurations are identical. The 1KSMB13A maintains active product status, ensuring long-term availability and supply chain continuity.

Both components comply with RoHS requirements and share identical Moisture Sensitivity Level (MSL) ratings. The 1KSMB13A carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory standards. Operating temperature ranges differ slightly (1KSMB13A: -55°C to 175°C versus 1KSMB13: -65°C to 150°C), with the substitute providing an extended upper temperature limit.

Selection of the 1KSMB13A eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs and PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB13A be used as a direct replacement for the 1KSMB13?

A: Yes. The 1KSMB13A provides direct functional equivalence. All critical electrical parameters (voltage ratings, peak pulse current, clamping voltage) and mechanical specifications (DO-214AA SMB package, surface mount configuration) are identical.

Q: What is the primary reason for substitution?

A: The 1KSMB13 is classified as obsolete. The 1KSMB13A is an active product, ensuring component availability and supply chain reliability for current and future production.

Q: Are there any differences in operating temperature ranges?

A: The 1KSMB13A operates from -55°C to 175°C, compared to the 1KSMB13 range of -65°C to 150°C. The substitute provides a higher maximum junction temperature, suitable for applications requiring extended thermal performance.

Q: Do both components use the same package?

A: Yes. Both the 1KSMB13 and 1KSMB13A use the DO-214AA (SMB) surface mount package, ensuring PCB layout and footprint compatibility without design modifications.

Q: Are there compliance differences between the two parts?

A: Both components are RoHS compliant. The 1KSMB13A carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The 1KSMB13 is RoHS Compliant with no REACH status specified.

Q: What electrical parameters determine substitution eligibility?

A: Substitution is determined by matching reverse standoff voltage (11.1V), breakdown voltage (12.4V minimum), clamping voltage (18.2V maximum), peak pulse current (54.9A), and peak pulse power (1000W).

Q: Is the 1KSMB13A suitable for telecom applications?

A: The 1KSMB13A is classified for general purpose applications. However, it meets all electrical specifications required for telecom transient voltage suppression, providing functional equivalence for the original telecom-designated 1KSMB13.