SA85A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA85A is a unidirectional Zener-type transient voltage suppressor diode designed for general-purpose overvoltage protection applications. Manufactured by onsemi in DO-15 through-hole packaging, this component provides 85V reverse standoff voltage with 137V maximum clamping voltage and 3.6A peak pulse current capability. The main part is currently obsolete, making equivalent and substitute parts essential for ongoing system support and new designs requiring this voltage protection specification.

Substiute Parts

SA85A

onsemiIn Stock: 1233SA85A Datasheet

Current PartRFQ

SA85A-AP

Micro Commercial CoIn Stock: 1004SA85A-AP Datasheet

DirectRFQ

SA85A-BP

Micro Commercial CoIn Stock: 931SA85A-BP Datasheet

DirectRFQ

SA85A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 784SA85A-E3/54 Datasheet

DirectRFQ

SA85AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1204SA85AHE3/54 Datasheet

DirectRFQ

P5KE85A-AP

Micro Commercial CoIn Stock: 909P5KE85A-AP Datasheet

SimilarRFQ

P5KE85A-BP

Micro Commercial CoIn Stock: 1114P5KE85A-BP Datasheet

SimilarRFQ

P5KE85A-TP

Micro Commercial CoIn Stock: 4792P5KE85A-TP Datasheet

SimilarRFQ

SA85A

Taiwan Semiconductor CorporationIn Stock: 1219SA85A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA85A are classified based on strict electrical and mechanical parameter alignment:

Direct Substitutes maintain identical electrical specifications (85V standoff, 137V clamping, 500W peak pulse power) with compatible through-hole DO-15 packaging. These parts are interchangeable at the circuit level:

• SA85A-AP (Micro Commercial Co)
• SA85A-BP (Micro Commercial Co)
• SA85A-E3/54 (Vishay General Semiconductor)
• SA85AHE3/54 (Vishay General Semiconductor)
• SA85A (Taiwan Semiconductor Corporation)

Similar Substitutes share the same voltage protection parameters (85V standoff, 137V clamping) and through-hole mounting but may have different peak pulse current ratings or temperature operating ranges. These require verification of application-specific current and thermal requirements:

• P5KE85A-AP (Micro Commercial Co)
• P5KE85A-BP (Micro Commercial Co)
• P5KE85A-TP (Micro Commercial Co)

Substitution eligibility is determined by matching: reverse standoff voltage, breakdown voltage minimum, clamping voltage maximum, peak pulse power rating, package type, and mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Preferred for Obsolete Part Replacement):

SA85A-E3/54 and SA85AHE3/54 from Vishay General Semiconductor are recommended as primary replacements. Both maintain exact electrical specifications (85V standoff, 137V clamping, 3.6A peak pulse) with active product status and RoHS3 compliance. SA85AHE3/54 includes AEC-Q101 automotive qualification for applications requiring automotive-grade reliability.

SA85A-AP and SA85A-BP from Micro Commercial Co provide active alternatives with marginally higher peak pulse current (3.7A) and confirmed operating temperature range (-55°C to 175°C). Both are available in bulk packaging.

SA85A from Taiwan Semiconductor Corporation offers active status with 3.8A peak pulse current capability, RoHS3 compliance, and tape & reel packaging suitable for automated assembly.

Similar Substitutes (Application-Dependent Selection):

P5KE85A series parts (AP, BP, TP variants) from Micro Commercial Co maintain identical voltage protection parameters with extended lower temperature operating range (-65°C to 175°C). These are suitable for applications requiring enhanced cold-temperature performance. All three variants are active with bulk packaging.

Compliance Considerations:

All active substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original SA85A. RoHS3 compliance is confirmed for Vishay and Taiwan Semiconductor Corporation variants.

Frequently Asked Questions (FAQ)

Q: Can SA85A-AP or SA85A-BP be used as direct replacements for the obsolete onsemi SA85A?

A: Yes. Both maintain identical reverse standoff voltage (85V), breakdown voltage (94.4V minimum), and clamping voltage (137V maximum) specifications. The 3.7A peak pulse current is marginally higher than the original 3.6A, which is acceptable for general-purpose protection applications. Both are active products with confirmed operating temperature range.

Q: What is the difference between SA85A-E3/54 and SA85AHE3/54?

A: Both parts share identical electrical specifications and packaging. SA85AHE3/54 includes AEC-Q101 automotive qualification and is designated for automotive applications. Select SA85AHE3/54 for automotive or mission-critical applications requiring automotive-grade reliability.

Q: Are P5KE85A series parts compatible with SA85A applications?

A: P5KE85A series parts (AP, BP, TP) maintain the same voltage protection parameters (85V standoff, 137V clamping, 500W peak pulse power) and through-hole DO-15 packaging. The primary difference is extended lower temperature operating range (-65°C versus -55°C). These are suitable substitutes when cold-temperature performance is required.

Q: What packaging options are available for SA85A substitutes?

A: All substitute parts are available in through-hole DO-15 or DO-204AC (DO-15) axial packaging. Vishay and Taiwan Semiconductor Corporation variants are supplied in tape & reel (TR) packaging suitable for automated assembly. Micro Commercial Co variants are available in bulk packaging.

Q: Do all substitute parts meet REACH and export compliance requirements?

A: Yes. All listed substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original SA85A specification.