SA11C-B Equivalent & Substitute Parts

Part Overview

The SA11C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional Zener diode provides transient overvoltage protection with an 11V reverse standoff voltage and 18.2V maximum clamping voltage at peak pulse current. The SA11C-B is classified as obsolete, necessitating identification of active equivalent parts for continued circuit design and procurement purposes.

Substiute Parts

SA11C-B

Littelfuse Inc.In Stock: 1080SA11C-B Datasheet

Current PartRFQ

SA11CA

Taiwan Semiconductor CorporationIn Stock: 300126SA11CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA11C-B is determined by electrical and mechanical parameter equivalence. The substitute part SA11CA meets all critical electrical specifications: identical reverse standoff voltage (11V), breakdown voltage (12.2V minimum), clamping voltage (18.2V maximum), peak pulse current (28A), and peak pulse power (500W). Both parts utilize the same package type (DO-204AC/DO-15 axial through-hole configuration) and share identical Zener diode topology with single bidirectional channel architecture.

The SA11CA differs from the SA11C-B in the following non-electrical aspects: product status (active versus obsolete), manufacturer (Taiwan Semiconductor Corporation versus Littelfuse Inc.), packaging format (Tape & Reel versus standard), operating temperature range (-55°C to 175°C versus -65°C to 175°C), and application classification (General Purpose versus Telecom). These differences do not affect functional equivalence in circuit operation.

Parameter Comparison

Engineering Selection Recommendations

The SA11CA is a direct functional equivalent to the SA11C-B for applications requiring 11V standoff protection with 28A peak pulse current handling. Selection of SA11CA is supported by the following factors:

Product Status: The SA11CA maintains active product status with Taiwan Semiconductor Corporation, ensuring continued availability and manufacturing support. The SA11C-B obsolete status limits future procurement options.

Compliance: Both parts maintain RoHS compliance. The SA11CA carries ROHS3 certification, representing current regulatory alignment. Both parts are classified as ECCN EAR99 and share identical HTSUS codes (8541.10.0080).

Electrical Equivalence: All critical electrical parameters are identical, including voltage ratings, current capacity, and power dissipation specifications.

Thermal Performance: The SA11CA operating temperature range (-55°C to 175°C) encompasses the majority of industrial and telecom applications. The SA11C-B extended lower temperature limit (-65°C) is not required for general-purpose applications.

Packaging: Both parts utilize identical through-hole DO-204AC (DO-15) axial package configuration, enabling direct board-level substitution without layout modification.

Frequently Asked Questions (FAQ)

Q: Can SA11CA replace SA11C-B in existing circuit designs?

A: Yes. The SA11CA provides identical electrical performance across all critical parameters: 11V reverse standoff voltage, 12.2V minimum breakdown voltage, 18.2V maximum clamping voltage, and 28A peak pulse current. The through-hole DO-204AC package is mechanically identical, permitting direct substitution without circuit redesign.

Q: What is the difference in operating temperature range between these parts?

A: The SA11C-B operates from -65°C to 175°C, while the SA11CA operates from -55°C to 175°C. The SA11CA's lower temperature limit is -55°C. Applications requiring operation below -55°C junction temperature require the SA11C-B specification. Most telecom and general-purpose applications operate within the SA11CA temperature range.

Q: Are there packaging differences between SA11C-B and SA11CA?

A: Both parts use the DO-204AC (DO-15) axial through-hole package. The SA11C-B is supplied in standard packaging, while the SA11CA is available in Tape & Reel (TR) format. The physical component dimensions and pin configuration are identical, enabling direct board substitution.

Q: What compliance certifications apply to SA11CA?

A: The SA11CA is ROHS3 compliant, RoHS compliant, and REACH unaffected. Both parts carry EAR99 ECCN classification and share HTSUS code 8541.10.0080. The SA11CA meets current regulatory requirements for electronic component procurement.

Q: Why is SA11C-B classified as obsolete?

A: The SA11C-B is listed as obsolete by Littelfuse Inc., indicating discontinued manufacturing and limited future availability. The SA11CA, manufactured by Taiwan Semiconductor Corporation, provides equivalent electrical and mechanical functionality with active product status and ongoing supply availability.

Q: Are there inventory considerations when selecting between these parts?

A: The SA11C-B has 996 pieces in stock (new original), while the SA11CA has 300,100 pieces in stock (new original). The SA11CA provides significantly greater inventory availability for immediate and future procurement requirements.