SA7.5 Equivalent & Substitute Parts

Part Overview

The SA7.5 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 7.5V reverse standoff voltage with a 14.65V maximum clamping voltage and 39.5A peak pulse current capability in a through-hole DO-204AC (DO-15) package. The SA7.5 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SA7.5

Littelfuse Inc.In Stock: 1046SA7.5 Datasheet

Current PartRFQ

SA7.5A

Taiwan Semiconductor CorporationIn Stock: 300283SA7.5A Datasheet

DirectRFQ

P5KE7.5A-AP

Micro Commercial CoIn Stock: 1061P5KE7.5A-AP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA7.5 are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff (Typ): 7.5V
• Voltage - Clamping (Max) @ Ipp: Within acceptable range for transient suppression
• Current - Peak Pulse (10/1000µs): Minimum 38.8A
• Power - Peak Pulse: 500W
• Package / Case: DO-204AC or DO-15 (through-hole axial)
• Type: Zener diode, unidirectional
• Operating Temperature Range: -55°C minimum to 175°C maximum

The substitute parts listed maintain these electrical and mechanical specifications within the tolerances required for direct circuit substitution without design modification.

Parameter Comparison

Engineering Selection Recommendations

Both SA7.5A (Taiwan Semiconductor Corporation) and P5KE7.5A-AP (Micro Commercial Co) are active product alternatives to the obsolete SA7.5. Selection between these substitutes is based on the following factors:

SA7.5A is the direct manufacturer equivalent from Taiwan Semiconductor Corporation, maintaining identical reverse standoff voltage and operating temperature range as the original SA7.5. This part is available in tape and reel packaging with high inventory levels (300,200 pcs), providing supply chain continuity. Both parts carry ROHS3 compliance and REACH unaffected status.

P5KE7.5A-AP from Micro Commercial Co offers an extended lower operating temperature limit (-65°C vs -55°C), providing broader thermal coverage for applications requiring enhanced cold-temperature performance. This part is available in bulk packaging with active product status. The clamping voltage is marginally lower (12.9V vs 14.65V), and peak pulse current is slightly reduced (38.8A vs 39.5A), remaining within functional equivalence for general-purpose transient suppression.

Both substitutes are ROHS3 compliant and carry EAR99 export classification identical to the original part.

Frequently Asked Questions (FAQ)

Q: Can SA7.5A and P5KE7.5A-AP be used interchangeably with SA7.5?

A: Both parts meet the core electrical specifications for substitution: 7.5V reverse standoff voltage, 500W peak pulse power, and through-hole DO-15 package compatibility. The clamping voltage and peak pulse current variations are within acceptable ranges for general-purpose transient protection circuits. Direct substitution is possible without circuit redesign.

Q: What is the difference in clamping voltage between these parts?

A: The SA7.5 clamps at 14.65V maximum, while both SA7.5A and P5KE7.5A-AP clamp at 12.9V maximum. This 0.65V difference represents improved clamping performance in the substitute parts and does not compromise circuit protection.

Q: Are there packaging differences I should consider?

A: All three parts use through-hole axial packages (DO-204AC or DO-15). SA7.5A is supplied in tape and reel format, while P5KE7.5A-AP is supplied in bulk. Both are compatible with standard through-hole PCB assembly processes.

Q: Which substitute should I select for new designs?

A: SA7.5A is recommended as the primary substitute due to identical operating temperature range and direct manufacturer equivalence. P5KE7.5A-AP is suitable when extended low-temperature performance (-65°C) is required.

Q: Are all parts RoHS compliant?

A: Yes. SA7.5, SA7.5A, and P5KE7.5A-AP are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.