SA17 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA17 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features a 17V reverse standoff voltage with a 28.98V maximum clamping voltage at peak pulse current of 18.5A, packaged in the DO-204AC (DO-15) through-hole configuration. The SA17 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	17.91	V
Voltage - Clamping (Max) @ Ipp	28.98	V
Current - Peak Pulse (10/1000µs)	18.5	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution eligibility for the SA17 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 17V
Voltage - Breakdown (Min): minimum 17.91V
Voltage - Clamping (Max) @ Ipp: maximum 28.98V
Current - Peak Pulse (10/1000µs): minimum 18.5A
Power - Peak Pulse: 500W
Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15
Type: Zener
Unidirectional Channels: 1

Substitute parts must maintain electrical compatibility within these parameters and be available in the same through-hole axial package configuration. All identified substitutes meet these core requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	Packaging
SA17	Littelfuse Inc.	17	17.91	28.98	18.5	500	-55 to 175	Obsolete	DO-204AC (DO-15)
SA17A	Taiwan Semiconductor Corporation	17	18.9	27.7	19	500	-55 to 175	Active	DO-204AC (DO-15)
SA17A-AP	Micro Commercial Co	17	18.9	27.6	18.5	500	-55 to 175	Active	DO-15
SA17A-BP	Micro Commercial Co	17	18.9	27.6	18.5	500	-55 to 175	Active	DO-15
SA17A-TP	Micro Commercial Co	17	18.9	27.6	18.5	500	-55 to 175	Active	DO-15
P5KE17A-AP	Micro Commercial Co	17	18.9	27.6	16.1	500	-65 to 175	Active	DO-15
P5KE17A-BP	Micro Commercial Co	17	18.9	27.6	16.1	500	-65 to 175	Active	DO-15
P5KE17A-TP	Micro Commercial Co	17	18.9	27.6	16.1	500	-65 to 175	Active	DO-15

Engineering Selection Recommendations

All identified substitute parts maintain the core electrical parameters required for SA17 replacement: 17V reverse standoff voltage, 500W peak pulse power rating, and through-hole DO-15 package configuration. All substitutes are classified as Active products, ensuring ongoing availability and manufacturing support.

SA17A (Taiwan Semiconductor Corporation) and SA17A variants (Micro Commercial Co) provide direct functional equivalence with identical peak pulse current ratings of 18.5A or 19A, matching or exceeding the original SA17 specification. These parts are ROHS3 compliant and carry REACH Unaffected status.

P5KE17A variants (Micro Commercial Co) offer functional substitution with a reduced peak pulse current rating of 16.1A. These parts are suitable for applications where the lower current specification remains within design margins. The P5KE17A series extends the operating temperature range to -65°C, providing enhanced low-temperature performance.

All substitute parts are available in bulk or tape & reel packaging configurations with substantial inventory levels, supporting both prototype and production-volume procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can SA17A directly replace SA17 in existing designs?

A: Yes. SA17A maintains the 17V reverse standoff voltage, 500W peak pulse power rating, and DO-15 through-hole package. The clamping voltage is slightly lower (27.7V vs 28.98V), and peak pulse current is equal or higher (19A vs 18.5A), making it electrically compatible for general-purpose transient suppression applications.

Q: What is the difference between SA17A variants (AP, BP, TP)?

A: The suffix designations (AP, BP, TP) indicate packaging and tape configuration options. All three variants share identical electrical specifications: 17V reverse standoff, 27.6V clamping voltage, and 18.5A peak pulse current. Selection depends on procurement and assembly requirements rather than electrical performance.

Q: Are P5KE17A parts suitable replacements despite lower peak pulse current?

A: P5KE17A variants specify 16.1A peak pulse current compared to SA17's 18.5A. These parts are functionally equivalent if circuit design margins accommodate the reduced current specification. The extended operating temperature range (-65°C to 175°C) provides additional environmental protection. Verify application requirements before selection.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts are ROHS3 compliant and carry REACH Unaffected status. Moisture sensitivity level is rated as 1 (Unlimited) for all parts. ECCN classification is EAR99 for all variants.

Q: Does package configuration affect electrical performance?

A: No. All parts use the DO-204AC or DO-15 through-hole axial package. Package variants (bulk, tape & reel) affect procurement and assembly processes but not electrical characteristics. Verify supplier device package specifications match assembly equipment requirements.

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