SA170ARLG Equivalent & Substitute Parts

Part Overview

The SA170ARLG is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in through-hole axial configurations. This component operates with a 170V reverse standoff voltage and provides 275V maximum clamping voltage with 1.8A peak pulse current capability. The SA170ARLG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SA170ARLG

onsemiIn Stock: 976SA170ARLG Datasheet

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SA170A

Taiwan Semiconductor CorporationIn Stock: 1033SA170A Datasheet

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1N8182

Microchip TechnologyIn Stock: 8391N8182 Datasheet

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P5KE170A-AP

Micro Commercial CoIn Stock: 822P5KE170A-AP Datasheet

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P5KE170A-BP

Micro Commercial CoIn Stock: 913P5KE170A-BP Datasheet

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P5KE170A-TP

Micro Commercial CoIn Stock: 984P5KE170A-TP Datasheet

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SA170A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 923SA170A-E3/54 Datasheet

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SA170AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 817SA170AHE3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA170ARLG are selected based on strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters determining substitution eligibility are:

• Voltage - Reverse Standoff (Typ): 170V
• Voltage - Clamping (Max) @ Ipp: 275V
• Current - Peak Pulse (10/1000µs): 1.8A
• Power - Peak Pulse: 500W
• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial

Substitute parts are grouped into two categories: direct equivalents matching all primary electrical specifications, and similar parts meeting core voltage and current requirements with minor parameter variations. All substitute parts maintain the same unidirectional zener diode topology and general-purpose application profile.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The P5KE170A-AP, P5KE170A-BP, and P5KE170A-TP manufactured by Micro Commercial Co provide complete electrical and mechanical equivalence to the SA170ARLG. These parts match all critical parameters: 170V reverse standoff, 275V clamping voltage, 1.8A peak pulse current, and 500W peak pulse power. All three variants are active products with extended operating temperature ranges (-65°C to 175°C) and identical electrical specifications. Selection among these three variants depends on packaging requirements (all available in bulk).

The SA170A-E3/54 and SA170AHE3/54 manufactured by Vishay General Semiconductor are active equivalents with matching electrical specifications and ROHS3 compliance. The SA170AHE3/54 includes AEC-Q101 automotive qualification. Both are available in Tape & Reel packaging.

Secondary Substitute (Limited Application):

The SA170A manufactured by Taiwan Semiconductor Corporation is an active product with matching voltage specifications and 500W peak pulse power. However, the peak pulse current is specified at 100mA, significantly lower than the 1.8A requirement of the SA170ARLG. This part is suitable only for applications with reduced current demands.

Alternative with Parameter Variation:

The 1N8182 manufactured by Microchip Technology maintains the 170V reverse standoff voltage but specifies 294V maximum clamping voltage and 510mA peak pulse current with 150W peak pulse power. This part is not RoHS compliant and represents a lower-power alternative suitable only for reduced transient energy applications.

Frequently Asked Questions (FAQ)

Q: Can the SA170A be used as a direct replacement for the SA170ARLG?

A: The SA170A matches voltage specifications but specifies 100mA peak pulse current versus the SA170ARLG's 1.8A. Direct substitution is not recommended for applications requiring full 1.8A pulse handling capability.

Q: What is the difference between the P5KE170A variants (AP, BP, TP)?

A: All three P5KE170A variants (P5KE170A-AP, P5KE170A-BP, P5KE170A-TP) are electrically identical with matching 170V standoff, 275V clamping, and 1.8A peak pulse specifications. Differences relate to packaging and supplier configurations. Selection should be based on procurement and inventory requirements.

Q: Are the Vishay SA170A-E3/54 and SA170AHE3/54 interchangeable?

A: Both parts are electrically equivalent with identical voltage and current specifications. The SA170AHE3/54 includes AEC-Q101 automotive qualification, making it suitable for automotive applications. For non-automotive applications, either part is acceptable.

Q: Does the 1N8182 provide equivalent protection to the SA170ARLG?

A: The 1N8182 maintains the 170V reverse standoff voltage but specifies higher clamping voltage (294V) and lower peak pulse power (150W versus 500W). This part is suitable only for applications with reduced transient energy requirements and is not recommended as a general replacement.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in two packaging formats: Tape & Reel (TR) for automated assembly applications, and Bulk for manual or selective assembly. The SA170A, SA170A-E3/54, and SA170AHE3/54 are available in Tape & Reel. The P5KE170A variants and 1N8182 are available in Bulk packaging.

Q: Are all substitute parts RoHS compliant?

A: The SA170A, SA170A-E3/54, and SA170AHE3/54 are ROHS3 compliant. The 1N8182 is RoHS non-compliant. The P5KE170A variants do not specify RoHS status in available documentation.