SA20A-T Equivalent & Substitute Parts

Part Overview

The SA20A-T is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, rated for 20V reverse standoff voltage with a 32.4V maximum clamping voltage. This through-hole component in DO-15 packaging is designed for general-purpose transient voltage protection applications. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	20V
Voltage - Breakdown (Min)	22.2V
Voltage - Clamping (Max) @ Ipp	32.4V
Current - Peak Pulse (10/1000µs)	15.4A
Power - Peak Pulse	500W
Type	Zener
Unidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature	-65°C ~ 175°C (TJ)
Applications	General Purpose

Substitute Part Grouping Explanation

Substitution for the SA20A-T TVS diode is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 20V (±tolerance)
Voltage - Clamping (Max) @ Ipp: 32.4V
Current - Peak Pulse (10/1000µs): 15.4A minimum
Power - Peak Pulse: 500W
Package / Case: DO-15 or DO-204AC (DO-15)
Mounting Type: Through Hole
Type: Zener, Unidirectional

All substitute parts listed maintain these electrical specifications and physical form factors, ensuring direct functional replacement without circuit redesign. Differences in product status, manufacturer, and packaging format (bulk, cut tape, tape & reel) do not affect electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Inventory
SA20A-T	Diodes Incorporated	Obsolete	20V	32.4V	15.4A	500W	-65°C ~ 175°C (TJ)	DO-15	678 Pcs
P5KE20A-AP	Micro Commercial Co	Active	20V	32.4V	15.4A	500W	-65°C ~ 175°C (TJ)	DO-15	820 Pcs
P5KE20A-BP	Micro Commercial Co	Active	20V	32.4V	15.4A	500W	-65°C ~ 175°C (TJ)	DO-15	791 Pcs
P5KE20A-TP	Micro Commercial Co	Active	20V	32.4V	15.4A	500W	-65°C ~ 175°C (TJ)	DO-15	802 Pcs
SA20A	Fairchild Semiconductor	Obsolete	20V	32.4V	15.7A	500W	-55°C ~ 175°C (TJ)	DO-204AC (DO-15)	300400 Pcs
SA20A-E3/54	Vishay General Semiconductor - Diodes Division	Active	20V	32.4V	15.4A	500W	-55°C ~ 175°C (TJ)	DO-204AC (DO-15)	4300 Pcs
SA20AHE3/54	Vishay General Semiconductor - Diodes Division	Active	20V	32.4V	15.4A	500W	-55°C ~ 175°C (TJ)	DO-204AC (DO-15)	883 Pcs
SA20A-AP	Micro Commercial Co	Active	20V	32.4V	15.7A	500W	-55°C ~ 175°C (TJ)	DO-15	1082 Pcs
SA20A-BP	Micro Commercial Co	Active	20V	32.4V	15.7A	500W	-55°C ~ 175°C (TJ)	DO-15	720 Pcs
SA20A-TP	Micro Commercial Co	Active	20V	32.4V	15.7A	500W	-55°C ~ 175°C (TA)	DO-15	10214 Pcs

Engineering Selection Recommendations

For applications requiring the SA20A-T, the following active substitute parts are recommended based on product status and compliance:

Primary Substitutes (Active Status, Full Electrical Equivalence):

SA20A-TP (Micro Commercial Co): Active product with highest inventory (10214 Pcs), RoHS3 compliant, MSL 1. Available in cut tape packaging.
SA20A-AP (Micro Commercial Co): Active product with 1082 Pcs inventory, RoHS3 compliant. Available in bulk packaging.
SA20A-BP (Micro Commercial Co): Active product with 720 Pcs inventory. Available in bulk packaging.
P5KE20A-TP (Micro Commercial Co): Active product with 802 Pcs inventory. Available in bulk packaging.
P5KE20A-AP (Micro Commercial Co): Active product with 820 Pcs inventory. Available in bulk packaging.
P5KE20A-BP (Micro Commercial Co): Active product with 791 Pcs inventory. Available in bulk packaging.

Secondary Substitutes (Active Status, Vishay TransZorb® Series):

SA20A-E3/54 (Vishay): Active product with 4300 Pcs inventory, RoHS3 compliant, MSL 1. Available in cut tape packaging.
SA20AHE3/54 (Vishay): Active product with 883 Pcs inventory, RoHS3 compliant, MSL 1, AEC-Q101 automotive qualified. Available in tape & reel packaging.

All listed substitutes maintain the critical electrical parameters (20V standoff, 32.4V clamping, 15.4A–15.7A peak pulse current, 500W peak power) and through-hole DO-15 form factor required for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can SA20A-TP directly replace SA20A-T without circuit modification? A: Yes. SA20A-TP maintains identical electrical specifications (20V standoff, 32.4V clamping, 15.4A peak pulse, 500W peak power) and DO-15 through-hole packaging. No circuit redesign is required.

Q: What is the difference between SA20A-TP, SA20A-AP, and SA20A-BP? A: These parts are electrically identical. The suffix indicates packaging format: TP = cut tape, AP = bulk, BP = bulk. Selection depends on procurement and assembly requirements.

Q: Are P5KE20A series parts compatible with SA20A-T? A: Yes. P5KE20A-TP, P5KE20A-AP, and P5KE20A-BP are electrically equivalent to SA20A-T, maintaining the same voltage ratings, current ratings, and power dissipation. They are manufactured by Micro Commercial Co and are active products.

Q: Why is SA20AHE3/54 listed as a secondary substitute? A: SA20AHE3/54 is electrically equivalent but includes AEC-Q101 automotive qualification and is supplied in tape & reel format. It is suitable for applications requiring automotive-grade components.

Q: Does operating temperature range affect substitution? A: The SA20A-T operates from -65°C to 175°C (TJ). Most active substitutes operate from -55°C to 175°C (TJ), which is acceptable for general-purpose applications. For applications requiring the full -65°C lower limit, verify specific design requirements.

Q: Are all substitute parts RoHS3 compliant? A: SA20A-TP, SA20A-E3/54, and SA20AHE3/54 are explicitly RoHS3 compliant. Compliance status for other substitutes should be verified with the manufacturer or distributor.

Q: What is the inventory status for each substitute? A: SA20A-TP has the highest inventory (10214 Pcs), followed by SA20A-E3/54 (4300 Pcs) and SA20A (300400 Pcs, Fairchild, obsolete). All active Micro Commercial Co and Vishay parts have confirmed stock availability.

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