SA45-E3/54 Equivalent & Substitute Parts

Part Overview

The SA45-E3/54 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is designed for general-purpose transient voltage suppression applications in through-hole configurations using the DO-204AC (DO-15) axial package format.

The SA45-E3/54 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production and maintenance requirements for systems utilizing this TVS diode.

Substiute Parts

SA45-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1157SA45-E3/54 Datasheet

Current PartRFQ

SA45A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 978SA45A-E3/54 Datasheet

DirectRFQ

SA45A

Fairchild SemiconductorIn Stock: 10501SA45A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA45-E3/54 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Breakdown (Min): 50V
• Unidirectional Channels: 1
• Mounting Type: Through Hole
• Package / Case: DO-204AC (DO-15) Axial
• Operating Temperature Range: -55°C to 175°C (TJ)
• RoHS Status: ROHS3 Compliant

Substitute parts must maintain identical or compatible values for these parameters to ensure functional equivalence in circuit protection applications. Variations in clamping voltage and peak pulse current are acceptable within the design envelope of the protected circuit, provided the standoff voltage, breakdown voltage, and package format remain consistent.

Parameter Comparison

Engineering Selection Recommendations

SA45A-E3/54 is the primary substitute for the SA45-E3/54. This part maintains all critical electrical parameters (45V standoff, 50V breakdown minimum) and identical mechanical specifications (DO-204AC through-hole axial package). The SA45A-E3/54 is currently in active production status, ensuring long-term availability and supply chain continuity. It carries ROHS3 compliance and unlimited moisture sensitivity rating, matching the original part's environmental specifications.

SA45A (Fairchild Semiconductor) is an alternative substitute that meets all critical electrical and mechanical requirements. However, this part is classified as obsolete, which may limit future availability. It is suitable for applications where existing inventory exists or where design flexibility permits cross-manufacturer sourcing.

For new designs or ongoing production requiring maximum component availability, SA45A-E3/54 is the recommended selection due to its active product status.

Frequently Asked Questions (FAQ)

Q: Can SA45A-E3/54 be used as a direct replacement for SA45-E3/54?

A: Yes. Both parts share identical reverse standoff voltage (45V), breakdown voltage minimum (50V), operating temperature range (-55°C to 175°C), and DO-204AC through-hole axial package format. The SA45A-E3/54 exhibits lower clamping voltage (72.7V vs. 80.3V) and higher peak pulse current capability (6.9A vs. 6.2A), making it functionally compatible for general-purpose transient voltage suppression applications.

Q: What is the difference between SA45A-E3/54 and SA45A?

A: Both parts are electrically equivalent with identical standoff and breakdown voltages. The primary differences are manufacturer (Vishay vs. Fairchild), series designation (TransZorb® vs. SA), packaging format (Tape & Reel vs. Bulk), and product status (Active vs. Obsolete). For new applications, SA45A-E3/54 is preferred due to active production status.

Q: Are there any package compatibility concerns when substituting these parts?

A: No. All three parts use the DO-204AC (DO-15) axial through-hole package format. Pin configuration and mechanical dimensions are identical, permitting direct board-level substitution without layout modifications.

Q: Does the lower clamping voltage of SA45A-E3/54 affect circuit protection performance?

A: The clamping voltage difference (72.7V vs. 80.3V) reflects manufacturing variation within the same voltage class. Both parts maintain the same 45V standoff and 50V minimum breakdown specifications. Circuit protection effectiveness is determined by these standoff and breakdown parameters, not clamping voltage alone. The SA45A-E3/54's improved peak pulse current rating (6.9A) provides enhanced transient suppression capability.

Q: Are all substitute parts RoHS compliant?

A: Yes. SA45-E3/54, SA45A-E3/54, and SA45A are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.