SA17ARLG Equivalent & Substitute Parts

Part Overview

The SA17ARLG is a 17V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 27.6V clamping voltage and 18.1A peak pulse current in a DO-204AC (DO-15) axial through-hole package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical equivalence across voltage ratings, clamping characteristics, and current handling capabilities while accommodating available packaging and product status options.

Key Parameters

Parameter	SA17ARLG
Voltage - Reverse Standoff (Typ)	17V
Voltage - Breakdown (Min)	18.9V
Voltage - Clamping (Max) @ Ipp	27.6V
Current - Peak Pulse (10/1000µs)	18.1A
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
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SA17ARLG is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 17V (required match)
Voltage - Breakdown (Min): 18.9V (required match)
Voltage - Clamping (Max) @ Ipp: 27.6V ±0.1V tolerance
Current - Peak Pulse (10/1000µs): 16.1A minimum
Power - Peak Pulse: 500W minimum
Mounting Type: Through Hole
Package / Case: DO-204AC (DO-15) or equivalent axial configuration
Type: Zener, Unidirectional (1 channel)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (500W class): Parts maintaining 500W peak pulse power rating with current ratings between 16.1A and 19A, compatible with standard through-hole axial mounting.

Category B - Enhanced Performance Alternatives (5kW class): Parts with identical voltage specifications but elevated current and power ratings (184.8A, 5kW), suitable for applications requiring higher transient energy absorption. These parts use P600 package configuration.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status	RoHS Status
SA17ARLG	Littelfuse Inc.	17V	18.9V	27.6V	18.1A	500W	-55°C ~ 150°C	DO-204AC (DO-15)	Obsolete	ROHS3 Compliant
SA17A	Taiwan Semiconductor Corporation	17V	18.9V	27.7V	19A	500W	-55°C ~ 175°C	DO-204AC (DO-15)	Active	ROHS3 Compliant
SA17A-E3/54	Vishay General Semiconductor - Diodes Division	17V	18.9V	27.6V	18.1A	500W	-55°C ~ 175°C	DO-204AC (DO-15)	Active	ROHS3 Compliant
SA17AHE3/54	Vishay General Semiconductor - Diodes Division	17V	18.9V	27.6V	18.1A	500W	-55°C ~ 175°C	DO-204AC (DO-15)	Active	ROHS3 Compliant
P5KE17A-AP	Micro Commercial Co	17V	18.9V	27.6V	16.1A	500W	-65°C ~ 175°C	DO-204AC (DO-15)	Active	Not specified
P5KE17A-BP	Micro Commercial Co	17V	18.9V	27.6V	16.1A	500W	-65°C ~ 175°C	DO-204AC (DO-15)	Active	Not specified
P5KE17A-TP	Micro Commercial Co	17V	18.9V	27.6V	16.1A	500W	-65°C ~ 175°C	DO-204AC (DO-15)	Active	Not specified
SLD17U-017	Littelfuse Inc.	17V	18.9V	27.6V	184.8A	5000W	-55°C ~ 175°C	P600	Active	ROHS3 Compliant
SLD17U-017-B	Littelfuse Inc.	17V	18.9V	27.6V	184.8A	5000W	-55°C ~ 175°C	P600	Active	ROHS3 Compliant
1N8158	Microchip Technology	17V	19V	27.7V	5.42A	150W	-55°C ~ 175°C	Axial	Active	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - 500W Class):

SA17A-E3/54 and SA17AHE3/54 from Vishay are preferred direct replacements. Both maintain identical electrical specifications to the SA17ARLG (27.6V clamping, 18.1A peak pulse current, 500W power rating) in the same DO-204AC (DO-15) package. Both are active products with ROHS3 compliance. SA17AHE3/54 carries AEC-Q101 automotive qualification, suitable for automotive applications.

SA17A from Taiwan Semiconductor Corporation provides electrical equivalence with marginally higher current rating (19A) and clamping voltage (27.7V), extended operating temperature range (-55°C to 175°C), and active product status with ROHS3 compliance.

Secondary Substitutes (500W Class, Alternate Packaging):

P5KE17A-AP, P5KE17A-BP, and P5KE17A-TP from Micro Commercial Co maintain voltage and power specifications but with reduced peak pulse current (16.1A). All three are active products with extended temperature range (-65°C to 175°C). These parts are suitable where the lower current rating is acceptable within circuit design margins.

Enhanced Performance Alternative (5kW Class):

SLD17U-017 and SLD17U-017-B from Littelfuse provide identical voltage specifications with significantly elevated current (184.8A) and power (5kW) ratings in P600 package. Both are active, ROHS3 compliant, and AEC-Q101 qualified. These are appropriate for applications requiring higher transient energy absorption or where package footprint permits P600 configuration.

Not Recommended:

1N8158 from Microchip Technology exhibits insufficient peak pulse current (5.42A) and power rating (150W) relative to the SA17ARLG specification, and carries RoHS non-compliant status.

Frequently Asked Questions (FAQ)

Q: Can SA17A directly replace SA17ARLG?

A: Yes. SA17A maintains the required 17V reverse standoff voltage, 18.9V minimum breakdown voltage, and 27.6V clamping specification. The 19A peak pulse current and 27.7V clamping voltage represent marginal increases within acceptable tolerance. Both use DO-204AC (DO-15) axial through-hole packaging. SA17A is an active product with ROHS3 compliance, addressing the obsolescence of SA17ARLG.

Q: What is the difference between SA17A-E3/54 and SA17AHE3/54?

A: Both parts are electrically identical with 27.6V clamping voltage and 18.1A peak pulse current. SA17AHE3/54 carries AEC-Q101 automotive qualification and is suitable for automotive applications. SA17A-E3/54 is specified for general purpose applications. Both are active products in tape and reel packaging.

Q: Why do SLD17U-017 and SLD17U-017-B have different current ratings?

A: Both parts are identical in electrical specification (17V standoff, 27.6V clamping) and differ only in packaging format. SLD17U-017 is supplied in tape and reel; SLD17U-017-B is supplied in bulk. The 184.8A peak pulse current and 5kW power rating apply to both. Selection depends on procurement and assembly requirements.

Q: Can P5KE17A series parts replace SA17ARLG?

A: P5KE17A-AP, P5KE17A-BP, and P5KE17A-TP maintain voltage equivalence (17V standoff, 18.9V breakdown, 27.6V clamping) and 500W power rating. The 16.1A peak pulse current is lower than SA17ARLG's 18.1A. These parts are suitable if circuit design margins accommodate the reduced current specification. All three are active products with extended temperature range (-65°C to 175°C).

Q: Is 1N8158 a suitable substitute?

A: No. 1N8158 exhibits insufficient peak pulse current (5.42A) and power rating (150W) compared to SA17ARLG (18.1A, 500W). Additionally, 1N8158 carries RoHS non-compliant status. This part does not meet the electrical requirements for direct substitution.

Q: What packaging considerations apply to SLD17U-017?

A: SLD17U-017 uses P600 package configuration, which differs from the SA17ARLG's DO-204AC (DO-15) axial package. P600 is a larger through-hole package suitable for higher current applications. PCB layout and mounting hole specifications must be verified before substitution. SLD17U-017 is appropriate only where P600 package footprint is accommodated in the design.

Q: Are all substitute parts ROHS3 compliant?

A: SA17A, SA17A-E3/54, SA17AHE3/54, SLD17U-017, and SLD17U-017-B are ROHS3 compliant. P5KE17A series parts (AP, BP, TP) do not specify RoHS status. 1N8158 is RoHS non-compliant. Compliance verification is required for applications with regulatory requirements.

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