SA75C Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SA75C is a 75V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 127.05V maximum clamping voltage, 4.2A peak pulse current capability, and 500W peak pulse power rating in a through-hole DO-204AC (DO-15) axial package. The SA75C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Substiute Parts

SA75C

Littelfuse Inc.In Stock: 893SA75C Datasheet

Current PartRFQ

SA75CA

Taiwan Semiconductor CorporationIn Stock: 910SA75CA Datasheet

DirectRFQ

P5KE75CA-TP

Micro Commercial CoIn Stock: 980P5KE75CA-TP Datasheet

MFR RecommendedRFQ

SA75CA-AP

Micro Commercial CoIn Stock: 857SA75CA-AP Datasheet

MFR RecommendedRFQ

SA75CA-BP

Micro Commercial CoIn Stock: 1098SA75CA-BP Datasheet

MFR RecommendedRFQ

SA75CA-TP

Micro Commercial CoIn Stock: 925SA75CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA75C is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 75V (±tolerance)
• Clamping Characteristics: Maximum clamping voltage and breakdown voltage within acceptable operating range
• Peak Pulse Current: Minimum 4.1A capability to meet or exceed original specification
• Package Compatibility: DO-204AC / DO-15 axial through-hole configuration
• Temperature Range: Operating range of -55°C to 175°C or broader
• Compliance: ROHS3 compliance and EAR99 classification

All substitute parts listed maintain these core electrical and mechanical parameters, ensuring functional equivalence in transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SA75CA (Taiwan Semiconductor Corporation)

The SA75CA is the direct functional equivalent with active product status. It maintains identical reverse standoff voltage (75V), equivalent clamping voltage (121V vs. 127.05V), and superior peak pulse current (4.3A vs. 4.2A). ROHS3 compliance and identical operating temperature range (-55°C to 175°C) ensure regulatory and thermal compatibility. This part is recommended as the first choice for SA75C replacement.

Alternative Substitutes: SA75CA-TP, SA75CA-BP, SA75CA-AP (Micro Commercial Co)

These variants provide active product status with identical electrical specifications to SA75CA. All three maintain 75V reverse standoff voltage, 121V clamping voltage, and 4.2A peak pulse current. Operating temperature ranges are -55°C to 175°C (matching SA75C). These parts are suitable where Micro Commercial Co supply chain or packaging preferences align with procurement requirements.

Extended Temperature Option: P5KE75CA-TP (Micro Commercial Co)

The P5KE75CA-TP offers an extended lower operating temperature limit (-65°C vs. -55°C), providing additional thermal margin for applications requiring broader temperature performance. Electrical specifications remain equivalent with 75V standoff voltage, 121V clamping voltage, and 4.1A peak pulse current. This part is appropriate for designs requiring enhanced low-temperature performance.

All substitute parts maintain DO-15 axial through-hole package compatibility, ensuring direct mechanical and electrical interchangeability with the SA75C in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can SA75CA directly replace SA75C in existing designs?

A: Yes. The SA75CA maintains identical reverse standoff voltage (75V), equivalent clamping voltage (121V vs. 127.05V), and superior peak pulse current (4.3A vs. 4.2A). Both use DO-15 axial through-hole packaging with identical pin configuration and footprint. No circuit modifications are required.

Q: What is the difference between SA75CA and the MCC variants (SA75CA-TP, SA75CA-BP, SA75CA-AP)?

A: All variants share identical electrical specifications (75V standoff, 121V clamping, 4.2A peak pulse current). The suffix designations (TP, BP, AP) indicate packaging or supplier-specific variants from Micro Commercial Co. Selection depends on supply chain availability and procurement preferences. Electrical performance is equivalent across all variants.

Q: Why does P5KE75CA-TP have a lower operating temperature minimum (-65°C vs. -55°C)?

A: The P5KE75CA-TP is designed for applications requiring extended low-temperature performance. The -65°C minimum operating temperature provides additional thermal margin compared to the standard -55°C specification. All other electrical parameters remain equivalent. This part is selected only when the broader temperature range is a design requirement.

Q: Are all substitute parts ROHS3 compliant?

A: SA75CA (Taiwan Semiconductor Corporation) is explicitly ROHS3 compliant. Compliance status for MCC variants (P5KE75CA-TP, SA75CA-TP, SA75CA-BP, SA75CA-AP) is not specified in available documentation. Verify ROHS3 compliance with the supplier if regulatory certification is required for your application.

Q: What is the significance of the clamping voltage difference (127.05V vs. 121V)?

A: The SA75C specifies a maximum clamping voltage of 127.05V, while substitute parts specify 121V. Both values fall within acceptable transient suppression performance for 75V standoff applications. The lower clamping voltage of substitutes provides slightly improved transient suppression characteristics. This difference does not affect functional compatibility in general-purpose transient protection circuits.

Q: Can these parts be used interchangeably in production?

A: Yes, all listed substitute parts are electrically and mechanically equivalent for transient voltage suppression applications. They share identical DO-15 axial through-hole packaging, 75V reverse standoff voltage, 500W peak pulse power rating, and general-purpose application classification. Production changeover requires only supplier and part number updates; no circuit redesign is necessary.