1KSMB36C Equivalent & Substitute Parts

Part Overview

The 1KSMB36C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional zener diode operates in the DO-214AA (SMB) surface mount package and provides 49.9V clamping protection at 20A peak pulse current. The part is classified as obsolete, necessitating identification of active equivalent components that maintain identical electrical and mechanical specifications for continued system integration and procurement.

Substiute Parts

1KSMB36C

Littelfuse Inc.In Stock: 11791KSMB36C Datasheet

Current PartRFQ

1KSMB36CA

Taiwan Semiconductor CorporationIn Stock: 11921KSMB36CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB36C is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Voltage - Reverse Standoff (Typ): 30.8V
• Voltage - Breakdown (Min): 34.2V
• Voltage - Clamping (Max) @ Ipp: 49.9V
• Current - Peak Pulse (10/1000µs): 20A
• Power - Peak Pulse: 1000W (1kW)

Mechanical Specifications:

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

The 1KSMB36CA manufactured by Taiwan Semiconductor Corporation meets all electrical and mechanical requirements for direct substitution. Both parts share identical voltage ratings, current handling capacity, power dissipation, and physical package specifications. The substitute part is classified as active product status, ensuring ongoing availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB36CA is a direct functional equivalent to the obsolete 1KSMB36C. Selection of the substitute part is based on the following engineering criteria:

Product Status: The 1KSMB36CA maintains active product status, ensuring long-term availability and supply chain reliability compared to the obsolete 1KSMB36C.

Compliance Certifications: Both parts maintain RoHS compliance. The 1KSMB36CA carries ROHS3 Compliant certification, meeting current regulatory requirements. Both parts are ECCN EAR99 classified and share identical HTSUS codes (8541.10.0080).

Electrical Equivalence: All critical voltage and current parameters are identical, including reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current specifications. Power dissipation capacity remains constant at 1000W.

Mechanical Compatibility: Both parts utilize the DO-214AA (SMB) surface mount package with identical footprints and mounting requirements. No PCB redesign or assembly process modification is required.

Environmental Specifications: Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating. The 1KSMB36CA operates across a wider temperature range (-55°C ~ 175°C) compared to the 1KSMB36C (-65°C ~ 150°C), providing enhanced thermal margin in high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB36CA be used as a direct replacement for the 1KSMB36C in existing designs?

A: Yes. The 1KSMB36CA is electrically and mechanically equivalent to the 1KSMB36C. All voltage ratings, current specifications, and package dimensions are identical. No circuit modifications or PCB layout changes are required.

Q: What is the primary reason for substitution?

A: The 1KSMB36C is classified as obsolete product. The 1KSMB36CA is an active equivalent that ensures continued procurement availability and supply chain continuity.

Q: Are there any differences in operating temperature ranges?

A: The 1KSMB36CA operates from -55°C to 175°C (TJ), while the 1KSMB36C operates from -65°C to 150°C (TJ). The substitute part provides a wider upper temperature limit, suitable for high-temperature environments.

Q: Do both parts share the same package specifications?

A: Yes. Both the 1KSMB36C and 1KSMB36CA use the DO-214AA (SMB) surface mount package. Physical dimensions, lead spacing, and PCB footprints are identical.

Q: Are there compliance or certification differences?

A: Both parts are RoHS compliant. The 1KSMB36CA carries ROHS3 Compliant certification, representing the current regulatory standard. Both parts maintain identical MSL 1 (Unlimited) moisture sensitivity ratings and EAR99 export classification.

Q: What are the critical electrical parameters that define substitution eligibility?

A: Substitution is determined by matching voltage ratings (30.8V reverse standoff, 34.2V breakdown minimum, 49.9V clamping maximum), current capacity (20A peak pulse), and power dissipation (1000W). The 1KSMB36CA meets all these specifications identically.

Q: Can the 1KSMB36CA be used in telecom applications?

A: Yes. The 1KSMB36CA is suitable for general purpose TVS applications and maintains the same electrical protection characteristics required for telecom transient voltage suppression.