SA45A-E3/54 Equivalent & Substitute Parts

Part Overview

The SA45A-E3/54 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates with a 45V reverse standoff voltage and provides 72.7V maximum clamping voltage at peak pulse current. The device is designed for general-purpose transient voltage suppression applications and is currently in active product status with RoHS3 compliance.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, obsolescence, or when alternative packaging or performance characteristics better suit specific application requirements. The parts listed below maintain electrical compatibility within defined parameter tolerances while offering different manufacturers, packaging options, or enhanced performance specifications.

Substiute Parts

SA45A-E3/54

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

Current PartRFQ

SA45A

Fairchild SemiconductorIn Stock: 10501SA45A Datasheet

DirectRFQ

5KP45A

Littelfuse Inc.In Stock: 30585KP45A Datasheet

MFR RecommendedRFQ

SAC45

Littelfuse Inc.In Stock: 4625SAC45 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SA45A-E3/54 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Breakdown (Min): 50V
• Voltage - Clamping (Max) @ Ipp: 72.7V (±tolerance acceptable)
• Type: Zener
• Unidirectional Channels: 1
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole
• Package / Case: DO-204AC (DO-15) or equivalent axial package

Compliance Requirements:

• RoHS3 Compliant
• ECCN: EAR99
• HTSUS: 8541.10.0080

Substitute parts must maintain all electrical parameters within the specified ranges and support the same through-hole mounting configuration. Current rating and power dissipation may vary provided the application requirements are met.

Parameter Comparison

Engineering Selection Recommendations

SA45A (Fairchild Semiconductor): This part maintains identical electrical specifications and DO-204AC package compatibility with the SA45A-E3/54. However, the part is marked as obsolete, making it unsuitable for new designs or long-term supply assurance. Use only when existing inventory must be consumed or for legacy system maintenance.

5KP45A (Littelfuse Inc.): This part maintains the same voltage ratings and operating temperature range but differs in package form (P600 vs. DO-204AC) and offers significantly higher peak pulse current (70.2A) and power dissipation (5000W). The 5KP45A is suitable for applications requiring enhanced transient suppression capability but requires PCB layout modification due to different package geometry. This part is active and RoHS3 compliant.

SAC45 (Littelfuse Inc.): This part maintains the same voltage standoff and breakdown specifications with nearly identical peak pulse current (6.8A vs. 6.9A) and power rating (500W). The clamping voltage is slightly higher at 77V compared to 72.7V. The SAC45 uses the same DO-204AC package and is active with RoHS3 compliance, making it a direct functional substitute with minimal design impact.

All substitute parts maintain RoHS3 compliance, EAR99 ECCN classification, and the specified HTSUS code, ensuring regulatory and export compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can SA45A-E3/54 be replaced with SA45A from Fairchild Semiconductor?

A: Electrically and mechanically, yes. Both parts share identical voltage ratings (45V standoff, 50V breakdown, 72.7V clamping) and the same DO-204AC package. However, the Fairchild SA45A is obsolete. Substitution is only recommended for legacy applications where existing inventory is available or for maintenance of fielded systems.

Q: What is the primary difference between SA45A-E3/54 and 5KP45A?

A: The 5KP45A offers significantly higher peak pulse current (70.2A vs. 6.9A) and power dissipation (5000W vs. 500W), making it suitable for higher-energy transient events. The trade-off is a different package form (P600 vs. DO-204AC), requiring PCB layout changes. Voltage ratings remain identical.

Q: Is SAC45 a direct replacement for SA45A-E3/54?

A: SAC45 is functionally equivalent with minimal differences. Both maintain 45V standoff and 50V breakdown voltages. The clamping voltage is slightly higher (77V vs. 72.7V), and peak pulse current is nearly identical (6.8A vs. 6.9A). Both use DO-204AC packaging. SAC45 is active and RoHS3 compliant, making it suitable for direct substitution in most applications.

Q: Do all substitute parts support the same operating temperature range?

A: Yes. SA45A, 5KP45A, and SAC45 all operate across -55°C to 175°C (TJ), matching the SA45A-E3/54 specification.

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

A: SA45A and SAC45 use identical DO-204AC (DO-15) axial packages and are pin-compatible. The 5KP45A uses a P600 package with different physical dimensions and pin spacing, requiring PCB layout modification. Verify footprint compatibility before selecting 5KP45A.

Q: What compliance certifications apply to all substitute parts?

A: All listed parts are RoHS3 compliant, classified as EAR99 for export control, and share the same HTSUS code (8541.10.0080), ensuring regulatory equivalence across all substitutes.