SA45HE3/73 Equivalent & Substitute Parts

Part Overview

The SA45HE3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for transient overvoltage protection in through-hole applications. Manufactured in the DO-204AC (DO-15) axial package, this component operates across an automotive-grade temperature range with AEC-Q101 qualification. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

SA45HE3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 1036SA45HE3/73 Datasheet

Current PartRFQ

SA45AHE3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 1257SA45AHE3/73 Datasheet

DirectRFQ

SA45A

Fairchild SemiconductorIn Stock: 10501SA45A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SA45HE3/73 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Breakdown (Min): 50V
• Package / Case: DO-204AC (DO-15) Axial
• Mounting Type: Through Hole
• Unidirectional Channels: 1
• Type: Zener

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: Must not exceed 80.3V (lower values acceptable)
• Current - Peak Pulse (10/1000µs): Must meet or exceed 6.2A
• Power - Peak Pulse: 500W (standard for this category)
• Operating Temperature Range: -55°C to 175°C (TJ)

The SA45AHE3/73 and SA45A meet these substitution criteria with compatible electrical characteristics and identical package specifications.

Parameter Comparison

Engineering Selection Recommendations

SA45AHE3/73 (Direct Substitute - Preferred)

The SA45AHE3/73 is the primary substitute for the obsolete SA45HE3/73. Both components share identical voltage ratings (45V reverse standoff, 50V breakdown minimum) and package specifications (DO-204AC through-hole axial). The SA45AHE3/73 maintains automotive-grade qualification with AEC-Q101 certification and ROHS3 compliance. The clamping voltage is lower (72.7V vs. 80.3V), and peak pulse current is higher (6.9A vs. 6.2A), both favorable characteristics for transient protection. Critically, the SA45AHE3/73 is currently in active production status, ensuring long-term availability and supply chain continuity.

SA45A (Alternative Substitute - Secondary Option)

The SA45A from Fairchild Semiconductor meets all mandatory electrical and package requirements with identical voltage ratings and DO-204AC through-hole configuration. Peak pulse current is 7A, exceeding the original specification. However, the SA45A is listed as obsolete and lacks automotive-grade designation and AEC-Q101 qualification, making it suitable only for non-automotive applications or as a temporary solution when SA45AHE3/73 is unavailable.

Frequently Asked Questions (FAQ)

Q: Can SA45AHE3/73 be used as a direct replacement for SA45HE3/73?

A: Yes. Both components share identical reverse standoff voltage (45V), breakdown voltage (50V), and DO-204AC through-hole package specifications. The SA45AHE3/73 is electrically compatible and maintains automotive-grade AEC-Q101 qualification. The lower clamping voltage (72.7V vs. 80.3V) and higher peak pulse current (6.9A vs. 6.2A) are acceptable variations for TVS diode substitution.

Q: What is the difference between SA45HE3/73 and SA45AHE3/73?

A: The primary differences are clamping voltage (80.3V vs. 72.7V) and peak pulse current (6.2A vs. 6.9A). Both maintain the same 45V reverse standoff and 50V breakdown specifications. The SA45AHE3/73 is in active production, while SA45HE3/73 is obsolete. Both are AEC-Q101 qualified automotive-grade components.

Q: Is SA45A suitable for automotive applications?

A: SA45A lacks automotive-grade designation and AEC-Q101 qualification. It is classified as general purpose and is obsolete. Use SA45A only for non-automotive applications or as a temporary interim solution.

Q: Are all three parts in the same package?

A: Yes. SA45HE3/73, SA45AHE3/73, and SA45A all use the DO-204AC (DO-15) axial through-hole package, ensuring mechanical and electrical compatibility on PCBs designed for the original component.

Q: What compliance standards apply to these TVS diodes?

A: SA45HE3/73 and SA45AHE3/73 are ROHS3 compliant and REACH unaffected. Both are AEC-Q101 qualified for automotive applications. SA45A is ROHS3 compliant but lacks automotive qualification.