SA15A-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA15A-B is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates across a temperature range of -55°C to 175°C and is RoHS3 compliant. The part is currently active in production with 1065 pieces available in bulk packaging. Alternative equivalent parts are available from multiple manufacturers to support supply chain flexibility and design requirements.

Substiute Parts

SA15A-B

Littelfuse Inc.In Stock: 1173SA15A-B Datasheet

Current PartRFQ

SA15A

Taiwan Semiconductor CorporationIn Stock: 300129SA15A Datasheet

MFR RecommendedRFQ

SA15A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 19315SA15A-E3/54 Datasheet

DirectRFQ

SA15A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 32167SA15A-E3/73 Datasheet

DirectRFQ

P6KE18A

Fairchild SemiconductorIn Stock: 45230P6KE18A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA15A-B are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff (Typ): 15V nominal
• Voltage - Breakdown (Min): 16.7V minimum
• Voltage - Clamping (Max) @ Ipp: 24.4V maximum
• Current - Peak Pulse (10/1000µs): 20.9A nominal
• Power - Peak Pulse: 500W minimum
• Package / Case: DO-204AC (DO-15) axial through-hole
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C to 175°C
• Type: Zener unidirectional

Parts meeting these electrical and mechanical specifications are considered direct substitutes. Variations in peak pulse current within the specified range and packaging format (bulk, tape & reel, or cut tape) do not affect functional compatibility in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active product status and are suitable for direct replacement in applications requiring 15V reverse standoff protection with DO-204AC (DO-15) through-hole packaging.

SA15A (Taiwan Semiconductor Corporation) and SA15A-E3/54 and SA15A-E3/73 (Vishay General Semiconductor - Diodes Division) are functionally equivalent to the SA15A-B across all critical electrical parameters. These parts are RoHS3 compliant and operate within the specified temperature range. Selection between these three options may be based on packaging format availability (tape & reel versus cut tape) and supply chain considerations.

P6KE18A (Fairchild Semiconductor) operates at a slightly elevated reverse standoff voltage (15.3V) and clamping voltage (25.2V) with higher peak pulse current (25A) and power dissipation (600W). This part is suitable for applications where higher transient energy absorption is required. The minimum operating temperature is -50°C rather than -55°C. RoHS compliance status is not specified for this part.

Frequently Asked Questions (FAQ)

Q: Can SA15A-B be directly replaced with SA15A from Taiwan Semiconductor Corporation?

A: Yes. Both parts share identical voltage specifications (15V reverse standoff, 16.7V breakdown minimum, 24.4V clamping maximum), equivalent peak pulse current (20.9A versus 21A), and identical operating temperature range (-55°C to 175°C). The primary difference is packaging format: SA15A is supplied in tape & reel format while SA15A-B is supplied in bulk. Both are RoHS3 compliant.

Q: What is the difference between Vishay SA15A-E3/54 and SA15A-E3/73?

A: Both Vishay parts are electrically identical with 15V reverse standoff, 16.7V breakdown minimum, 24.4V clamping maximum, and 20.5A peak pulse current. The difference lies in packaging format: SA15A-E3/54 is supplied in cut tape while SA15A-E3/73 is also supplied in cut tape. Both operate across -55°C to 175°C and are RoHS3 compliant.

Q: When should P6KE18A be selected instead of SA15A-B?

A: P6KE18A is selected when the application requires higher transient energy absorption capability. This part provides 25A peak pulse current (versus 20.9A) and 600W power dissipation (versus 500W). The clamping voltage is slightly higher at 25.2V. The minimum operating temperature is -50°C rather than -55°C. Use P6KE18A only if the circuit design specifically requires these enhanced specifications.

Q: Are all substitute parts available in DO-204AC (DO-15) through-hole packaging?

A: Yes. All listed substitute parts use DO-204AC (DO-15) axial through-hole packaging, ensuring mechanical and electrical compatibility with SA15A-B in PCB designs.

Q: What compliance certifications apply to these TVS diodes?

A: SA15A-B, SA15A, SA15A-E3/54, and SA15A-E3/73 are all RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level). All parts are REACH unaffected and classified under ECCN EAR99. P6KE18A RoHS compliance status is not specified in available documentation.