SA16-B Equivalent & Substitute Parts

Part Overview

The SA16-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in telecom applications. This component features a 16V reverse standoff voltage with a 26V maximum clamping voltage and 19.6A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package.

The SA16-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and repairs.

Substiute Parts

SA16-B

Littelfuse Inc.In Stock: 730SA16-B Datasheet

Current PartRFQ

SA16A

Fairchild SemiconductorIn Stock: 4202SA16A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA16-B is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 16V
• Voltage - Breakdown (Min): 17.8V
• Voltage - Clamping (Max) @ Ipp: 26V
• Current - Peak Pulse (10/1000µs): within acceptable tolerance of 19.6A
• Power - Peak Pulse: 500W
• Unidirectional Channels: 1
• Type: Zener

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, or Axial configuration
• Operating Temperature Range: must support the application's thermal requirements

The SA16A meets these substitution criteria with electrical parameters that align with the SA16-B specification, with a peak pulse current of 19.2A (within acceptable tolerance) and identical voltage ratings. Both components are through-hole mounted in axial packages suitable for direct circuit board replacement.

Parameter Comparison

Engineering Selection Recommendations

SA16A Substitution Suitability:

The SA16A from Fairchild Semiconductor is a direct electrical substitute for the SA16-B. Both components share identical voltage ratings (16V standoff, 17.8V breakdown, 26V clamping) and equivalent power dissipation (500W peak pulse). The peak pulse current difference of 0.4A (19.6A vs. 19.2A) is within acceptable engineering tolerance for transient suppression applications.

Compliance Considerations:

Both the SA16-B and SA16A are RoHS compliant, with the SA16A meeting ROHS3 standards. Both components carry the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications, supporting equivalent regulatory and export compliance profiles.

Temperature Range Consideration:

The SA16-B operates across a wider temperature range (-65°C to 175°C) compared to the SA16A (-55°C to 150°C). Applications requiring operation below -55°C or above 150°C junction temperature must retain the SA16-B or identify alternative parts with extended temperature specifications.

Packaging and Mounting:

Both components are through-hole mounted in DO-204AC (DO-15) axial packages, enabling direct mechanical and electrical substitution on printed circuit boards without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the SA16A directly replace the SA16-B in all applications?

A: The SA16A is electrically and mechanically equivalent to the SA16-B for applications operating within the SA16A temperature range of -55°C to 150°C junction temperature. Applications requiring the extended lower temperature range of the SA16-B (-65°C) require verification of actual operating conditions before substitution.

Q: What is the significance of the 0.4A difference in peak pulse current (19.6A vs. 19.2A)?

A: The peak pulse current difference of 0.4A represents a 2% variance and is within acceptable tolerance for transient voltage suppression applications. Both components are rated for 500W peak pulse power and will perform equivalently in standard telecom protection circuits.

Q: Are both parts available in the same package?

A: Yes. Both the SA16-B and SA16A are supplied in DO-204AC (DO-15) axial through-hole packages, enabling direct board-level substitution without requiring circuit board redesign or component repositioning.

Q: What compliance certifications apply to both parts?

A: Both the SA16-B and SA16A are RoHS compliant. The SA16A meets ROHS3 standards. Both components carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications for regulatory and export purposes.

Q: Why are both parts classified as obsolete?

A: Both the SA16-B and SA16A are obsolete products. Identifying equivalent substitutes is necessary for legacy system support and repair. Current production alternatives with equivalent electrical specifications should be evaluated for new designs.

Q: What parameters must match for a valid substitution?

A: Valid substitution requires equivalence in voltage ratings (16V standoff, 17.8V breakdown, 26V clamping), peak pulse current (within tolerance), power dissipation (500W), unidirectional channel configuration (1 channel), package type (DO-204AC axial), and mounting method (through-hole). Operating temperature range must support the application's thermal requirements.