SA30ARLG Equivalent & Substitute Parts

Part Overview

The SA30ARLG is a 30V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This part operates with a 30V reverse standoff voltage, 48.4V maximum clamping voltage, and 10.3A peak pulse current in a DO-204AC (DO-15) axial package. The SA30ARLG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	33.3V
Voltage - Clamping (Max) @ Ipp	48.4V
Current - Peak Pulse (10/1000µs)	10.3A
Power - Peak Pulse	500W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution for the SA30ARLG is determined by matching the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff: 30V (exact match required)
Voltage - Clamping (Max) @ Ipp: 48.4V (exact match required for direct substitution)
Current - Peak Pulse (10/1000µs): 10.3A minimum (equal or greater acceptable)
Power - Peak Pulse: 500W minimum (equal or greater acceptable)
Mounting Type: Through Hole
Package / Case: DO-204AC (DO-15) Axial or compatible axial package
Type: Zener, Unidirectional

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (48.4V Clamping) Parts with identical 48.4V clamping voltage and compatible current ratings in DO-15 or equivalent axial packages.

Category 2: Higher Performance Alternatives (Different Clamping Voltage or Package) Parts with different electrical characteristics or larger packages that may serve specific application requirements but require design verification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
SA30ARLG	Littelfuse Inc.	30V	48.4V	10.3A	500W	-55°C ~ 150°C	DO-204AC (DO-15)	Obsolete
SA30A	Taiwan Semiconductor Corporation	30V	64.3V	10.8A	500W	-55°C ~ 175°C	DO-204AC (DO-15)	Active
SA30A-B	Littelfuse Inc.	30V	48.4V	10.5A	500W	-55°C ~ 175°C	DO-204AC (DO-15)	Active
SLD30U-017	Littelfuse Inc.	30V	48.4V	105.4A	5000W	-55°C ~ 175°C	P600	Active
SLD30U-017-B	Littelfuse Inc.	30V	48.4V	105.4A	5000W	-55°C ~ 175°C	P600	Active
1N8164	Microchip Technology	30V	49.9V	3.01A	150W	-55°C ~ 175°C	Axial	Active
P5KE30A-AP	Micro Commercial Co	30V	48.4V	10.3A	500W	-65°C ~ 175°C	DO-15	Active
P5KE30A-BP	Micro Commercial Co	30V	48.4V	10.3A	500W	-65°C ~ 175°C	DO-15	Active
P5KE30A-TP	Micro Commercial Co	30V	48.4V	10.3A	500W	-65°C ~ 175°C	DO-15	Active
SA30A-E3/54	Vishay General Semiconductor - Diodes Division	30V	48.4V	10A	500W	-55°C ~ 175°C	DO-204AC (DO-15)	Active
SA30A-TP	Micro Commercial Co	30V	48.4V	10.5A	500W	-55°C ~ 175°C	DO-15	Active

Engineering Selection Recommendations

Recommended Direct Substitutes (Identical Electrical Performance)

SA30A-B (Littelfuse Inc.) is the manufacturer-recommended replacement. It maintains the 48.4V clamping voltage and 500W power rating of the original SA30ARLG while offering improved temperature range (-55°C ~ 175°C) and active product status. This part is available in bulk packaging and provides the closest functional equivalent.

P5KE30A-AP, P5KE30A-BP, and P5KE30A-TP (Micro Commercial Co) are functionally equivalent alternatives with identical electrical specifications (30V standoff, 48.4V clamping, 10.3A peak pulse, 500W power). These parts are available in DO-15 packaging and offer extended temperature range (-65°C ~ 175°C). Packaging options include bulk, tape & reel, and cut tape formats.

SA30A-E3/54 (Vishay General Semiconductor - Diodes Division) provides equivalent performance with 48.4V clamping and 10A peak pulse current in DO-204AC (DO-15) packaging. This part is RoHS3 compliant and available in cut tape format with high inventory availability.

Alternative Substitutes (Different Electrical Characteristics)

SA30A (Taiwan Semiconductor Corporation) maintains the 30V standoff voltage but features 64.3V clamping voltage, which is higher than the original 48.4V specification. This part is suitable only if the application can tolerate higher clamping voltage and is available in tape & reel packaging with extended temperature range.

1N8164 (Microchip Technology) is a lower-power alternative with 49.9V clamping voltage and 3.01A peak pulse current (150W power rating). This part is suitable only for applications with lower transient current requirements and is not RoHS compliant.

Higher-Power Alternatives

SLD30U-017 and SLD30U-017-B (Littelfuse Inc.) are high-power variants in P600 packaging with 105.4A peak pulse current and 5000W power rating. These parts maintain 48.4V clamping voltage and are AEC-Q101 qualified for automotive applications. These alternatives are suitable only for applications requiring significantly higher transient energy absorption and different mechanical mounting.

Frequently Asked Questions (FAQ)

Q: Can SA30A-B be used as a direct replacement for SA30ARLG?

A: Yes. SA30A-B is the manufacturer-recommended substitute with identical electrical specifications (30V standoff, 48.4V clamping, 500W power) and compatible DO-204AC (DO-15) packaging. The extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 150°C) provides additional design margin.

Q: What is the difference between SA30A and SA30A-B?

A: SA30A-B is the bulk-packaged version of the SA series with identical electrical performance. SA30A (from Taiwan Semiconductor Corporation) has a higher clamping voltage (64.3V) and is available in tape & reel format. For direct substitution, SA30A-B is preferred.

Q: Are P5KE30A variants compatible with SA30ARLG?

A: Yes. P5KE30A-AP, P5KE30A-BP, and P5KE30A-TP all match the critical electrical parameters (30V standoff, 48.4V clamping, 10.3A peak pulse, 500W power) and use DO-15 axial packaging. The primary difference is packaging format (bulk, tape & reel, or cut tape) and extended temperature range (-65°C ~ 175°C).

Q: Why does SA30A show 64.3V clamping instead of 48.4V?

A: SA30A from Taiwan Semiconductor Corporation is a different variant within the SA30 base product family. While it maintains the 30V standoff voltage, the higher clamping voltage makes it unsuitable as a direct replacement unless the application design can accommodate the higher voltage transient response.

Q: Can SLD30U-017 replace SA30ARLG in a standard circuit?

A: SLD30U-017 maintains the 48.4V clamping voltage but uses a different P600 package and has significantly higher current handling (105.4A versus 10.3A). This part is suitable only if the application requires higher transient energy absorption and the circuit board layout can accommodate the larger package.

Q: Is 1N8164 a suitable replacement?

A: 1N8164 is not recommended as a direct replacement. While it maintains the 30V standoff voltage, it has lower peak pulse current (3.01A versus 10.3A) and power rating (150W versus 500W). This part is suitable only for applications with significantly lower transient current requirements. Additionally, 1N8164 is not RoHS compliant.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in multiple packaging formats: bulk, cut tape (CT), and tape & reel (TR). All recommended direct substitutes maintain through-hole axial or DO-15 packaging compatible with SA30ARLG circuit board layouts. Verify packaging format against procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: Most recommended substitutes are RoHS3 compliant (SA30A-B, SA30A-E3/54, SA30A-TP, P5KE30A variants). The exception is 1N8164, which is RoHS non-compliant. Verify compliance requirements for your specific application.

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