SA150-B Equivalent & Substitute Parts

Part Overview

The SA150-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 150V reverse standoff voltage with a 243V maximum clamping voltage and 2.1A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA150-B is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance, repair, and component sourcing.

Substiute Parts

SA150-B

Littelfuse Inc.In Stock: 1093SA150-B Datasheet

Current PartRFQ

SA150A

Fairchild SemiconductorIn Stock: 16654SA150A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA150-B is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 150V
• Voltage - Breakdown (Min): 167V
• Voltage - Clamping (Max) @ Ipp: 243V
• Current - Peak Pulse (10/1000µs): 2.1A
• Power - Peak Pulse: 500W
• Type: Zener, Unidirectional (1 channel)

Mechanical Equivalence Criteria:

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

Compliance Criteria:

• RoHS Status: RoHS Compliant or ROHS3 Compliant
• ECCN: EAR99
• HTSUS: 8541.10.0080

The SA150A from Fairchild Semiconductor meets all electrical and mechanical equivalence requirements. Both parts share identical voltage ratings, current specifications, power dissipation capability, and package configuration. Compliance certifications are compatible across both components.

Parameter Comparison

*Operating temperature range differs at the lower limit. SA150-B supports -65°C minimum junction temperature, while SA150A supports -55°C minimum. For applications requiring operation below -55°C, the SA150-B provides extended low-temperature capability.

Engineering Selection Recommendations

SA150A (Fairchild Semiconductor) as Primary Substitute:

The SA150A is a direct electrical and mechanical equivalent to the SA150-B. Both components are classified as obsolete, indicating end-of-life status from their respective manufacturers. The SA150A carries ROHS3 compliance certification, meeting current regulatory requirements for electronic components. With 16,583 units in current inventory stock, the SA150A offers superior availability compared to the SA150-B (985 units in stock).

Application Compatibility:

The SA150-B was specified for telecom applications, while the SA150A is designated for general-purpose applications. The identical electrical specifications and package configuration ensure functional compatibility across both application categories. The SA150A substitution is appropriate for all circuit designs currently utilizing the SA150-B.

Temperature Consideration:

The SA150-B supports a lower operating temperature minimum of -65°C compared to the SA150A at -55°C. For applications requiring operation at temperatures below -55°C junction temperature, the SA150-B remains the required component. For all other temperature ranges within the -55°C to 175°C overlap, the SA150A provides equivalent performance.

Frequently Asked Questions (FAQ)

Q: Can the SA150A directly replace the SA150-B in existing circuit designs?

A: Yes. The SA150A provides direct electrical and mechanical substitution for the SA150-B. Both components share identical voltage ratings (150V standoff, 167V breakdown minimum, 243V clamping maximum), current specifications (2.1A peak pulse), power dissipation (500W peak pulse), and package configuration (DO-204AC through-hole axial). Pin-for-pin and functional compatibility is confirmed.

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

A: The SA150-B operates from -65°C to 175°C junction temperature, while the SA150A operates from -55°C to 175°C. The SA150A has a 10°C higher minimum operating temperature limit. For applications operating below -55°C, the SA150-B is required. For all applications within the -55°C to 175°C range, both parts are equivalent.

Q: Are there any compliance or certification differences?

A: Both parts are RoHS compliant. The SA150-B carries RoHS Compliant certification, while the SA150A carries ROHS3 Compliant certification. Both share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. The ROHS3 certification on the SA150A reflects current regulatory standards.

Q: Why is the SA150-B listed as obsolete?

A: The SA150-B is an end-of-life component from Littelfuse Inc. Obsolete status indicates the manufacturer has discontinued production. The SA150A from Fairchild Semiconductor provides equivalent functionality and remains available through component distributors.

Q: What is the package configuration for both parts?

A: Both the SA150-B and SA150A use the DO-204AC package, also designated as DO-15. This is a through-hole axial package with two leads suitable for insertion into printed circuit boards with standard 0.1-inch lead spacing. The package dimensions and lead configuration are identical between both parts.

Q: Can I use the SA150A in telecom applications originally designed for the SA150-B?

A: Yes. While the SA150-B was specified for telecom applications and the SA150A is designated for general-purpose applications, the identical electrical specifications and package configuration ensure the SA150A functions equivalently in telecom circuit designs. The general-purpose designation of the SA150A does not limit its application scope.

Q: What inventory availability should I expect?

A: The SA150-B has 985 units in current stock. The SA150A has 16,583 units in current stock, providing significantly greater availability. For new designs or high-volume requirements, the SA150A offers superior supply chain reliability.