SA15-B Equivalent & Substitute Parts

Part Overview

The SA15-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 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 20.9A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package.

The SA15-B is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production builds, repairs, and system upgrades where the original part is no longer in active manufacturing.

Substiute Parts

SA15-B

Littelfuse Inc.In Stock: 824SA15-B Datasheet

Current PartRFQ

SA15A

Taiwan Semiconductor CorporationIn Stock: 300129SA15A Datasheet

DirectRFQ

SA15A-B

Littelfuse Inc.In Stock: 1173SA15A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA15-B is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 15V
• Voltage - Breakdown (Min): 16.7V
• Voltage - Clamping (Max) @ Ipp: 24.4V
• Current - Peak Pulse (10/1000µs): 20.9A minimum
• Power - Peak Pulse: 500W
• Type: Zener, Unidirectional

Mechanical Equivalence Criteria:

• Package / Case: DO-204AC (DO-15) Axial
• Mounting Type: Through-Hole

Compliance Criteria:

• RoHS Status: RoHS Compliant or ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute parts SA15A and SA15A-B meet all electrical and mechanical equivalence requirements. Both parts maintain identical voltage ratings, clamping characteristics, and package specifications. The SA15A operates at 21A peak pulse current, which exceeds the minimum 20.9A requirement. The SA15A-B maintains the exact 20.9A specification of the original part.

Parameter Comparison

Engineering Selection Recommendations

SA15A (Taiwan Semiconductor Corporation)

The SA15A is an active product with ROHS3 compliance and represents a direct electrical equivalent with 21A peak pulse current capability, exceeding the SA15-B specification of 20.9A. This part is suitable for new designs and production applications where component availability and long-term supply are required. The SA15A operates across a -55°C to 175°C temperature range, which covers the majority of standard industrial and telecom applications. Availability is high with 300,100 pieces in stock.

SA15A-B (Littelfuse Inc.)

The SA15A-B is an active product manufactured by the original equipment supplier, Littelfuse Inc., with ROHS3 compliance. This part maintains exact electrical equivalence to the SA15-B with identical 20.9A peak pulse current and operating temperature range of -55°C to 175°C. Selection of the SA15A-B is appropriate for applications requiring continuity with the original manufacturer or where design validation has been performed with Littelfuse components. Availability is 1,065 pieces in stock.

Both substitute parts are electrically and mechanically compatible with the SA15-B in DO-204AC through-hole applications. Selection between SA15A and SA15A-B depends on manufacturer preference, supply chain strategy, and application-specific requirements.

Frequently Asked Questions (FAQ)

Q: Can the SA15A or SA15A-B be used as direct replacements for the SA15-B in existing designs?

A: Yes. Both substitute parts maintain identical voltage ratings (15V reverse standoff, 24.4V clamping), equivalent or superior peak pulse current specifications, and identical DO-204AC through-hole packaging. Electrical and mechanical compatibility is confirmed across all critical parameters.

Q: What is the difference between SA15A and SA15A-B?

A: The SA15A is manufactured by Taiwan Semiconductor Corporation and operates at 21A peak pulse current. The SA15A-B is manufactured by Littelfuse Inc. and operates at 20.9A peak pulse current, matching the original SA15-B specification exactly. Both parts are electrically equivalent and suitable for substitution. The choice depends on manufacturer preference and supply availability.

Q: Are there temperature range differences between the SA15-B and substitute parts?

A: The SA15-B operates from -65°C to 175°C. Both SA15A and SA15A-B operate from -55°C to 175°C. The substitute parts have a narrower lower temperature limit by 10°C. For applications requiring operation below -55°C, the original SA15-B specification must be maintained.

Q: What packaging options are available for the substitute parts?

A: The SA15A is supplied in Tape & Reel (TR) packaging. The SA15A-B is supplied in Bulk packaging. Both maintain the same DO-204AC (DO-15) axial through-hole component format. Packaging selection depends on production volume and assembly process requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SA15A and SA15A-B are ROHS3 compliant. The original SA15-B is RoHS compliant. All three parts meet RoHS environmental standards and are suitable for applications with RoHS requirements.

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

A: All three parts—SA15-B, SA15A, and SA15A-B—have a Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or assembly.