1KSMB51C Equivalent & Substitute Parts

Part Overview

The 1KSMB51C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional zener diode operates with a reverse standoff voltage of 43.6V and provides clamping protection at 70.1V with a peak pulse current rating of 14.3A. The device is packaged in a surface mount DO-214AA (SMB) configuration and rated for automotive-grade applications.

The 1KSMB51C carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring identical electrical and mechanical specifications.

Substiute Parts

1KSMB51C

Littelfuse Inc.In Stock: 10971KSMB51C Datasheet

Current PartRFQ

1KSMB51CA

Taiwan Semiconductor CorporationIn Stock: 102271KSMB51CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1KSMB51C are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 43.6V
• Voltage - Breakdown (Min): 48.5V
• Voltage - Clamping (Max) @ Ipp: 70.1V
• Current - Peak Pulse (10/1000µs): 14.3A
• Power - Peak Pulse: 1000W

Mechanical Parameters (Must Match):

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

Functional Parameters (Must Match):

• Type: Zener
• Category: Transient Voltage Suppressors (TVS)

Parts meeting all these criteria are classified as direct electrical and mechanical equivalents, regardless of manufacturer or product status differences.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB51CA (Taiwan Semiconductor Corporation) is a direct electrical and mechanical equivalent to the 1KSMB51C. Both devices share identical voltage ratings, current specifications, and package configurations.

Key Considerations:

The 1KSMB51CA carries an active product status, ensuring ongoing availability and manufacturing support. This addresses the obsolescence of the original 1KSMB51C.

Both parts maintain RoHS compliance. The 1KSMB51CA achieves ROHS3 compliance, meeting current regulatory requirements. The 1KSMB51C is RoHS Compliant.

The 1KSMB51CA operates across a wider temperature range (-55°C ~ 175°C) compared to the 1KSMB51C (-65°C ~ 150°C). This extended range provides additional operational margin in temperature-sensitive applications.

The 1KSMB51CA is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. The original part was supplied in standard packaging.

Both devices maintain MSL Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB51CA replace the 1KSMB51C in existing designs?

A: Yes. The 1KSMB51CA meets all electrical and mechanical specifications of the 1KSMB51C. Voltage ratings, current ratings, package type, and mounting configuration are identical. Direct substitution is supported.

Q: What is the primary reason for substitution?

A: The 1KSMB51C is obsolete. The 1KSMB51CA is an active product with ongoing manufacturing support and availability.

Q: Are there temperature range differences between these parts?

A: Yes. The 1KSMB51CA operates from -55°C to 175°C, while the 1KSMB51C operates from -65°C to 150°C. The 1KSMB51CA provides a wider upper temperature limit. Applications operating below -55°C require verification against the 1KSMB51C's lower limit of -65°C.

Q: Do packaging differences affect circuit board assembly?

A: The 1KSMB51CA is supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly. The original 1KSMB51C used standard packaging. Both use identical DO-214AA (SMB) component packages. Assembly equipment compatibility depends on your manufacturing process, not the component itself.

Q: Are both parts RoHS compliant?

A: Yes. The 1KSMB51C is RoHS Compliant. The 1KSMB51CA is ROHS3 Compliant, meeting current regulatory standards.

Q: What is the moisture sensitivity level for both parts?

A: Both the 1KSMB51C and 1KSMB51CA carry MSL Level 1 (Unlimited), indicating no moisture sensitivity constraints. Standard storage and handling practices apply.

Q: Are there application differences between these parts?

A: The 1KSMB51C is specified for telecom applications. The 1KSMB51CA is specified for general purpose applications. Both devices are electrically and mechanically identical, supporting equivalent functional performance across application categories.