SA20CA-T Equivalent & Substitute Parts

Part Overview

The SA20CA-T is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in through-hole applications. This component features a 20V reverse standoff voltage with a 32.4V maximum clamping voltage and 15.4A peak pulse current capability in a DO-15 package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

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
Operating Temperature Range	-65°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Type	Zener
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility for the SA20CA-T is determined by strict equivalence across the following critical parameters: reverse standoff voltage (20V), breakdown voltage minimum (22.2V), clamping voltage maximum (32.4V), peak pulse current (15.4A), power dissipation (500W), package type (DO-15/DO-204AC), mounting configuration (through-hole axial), and zener diode type with single bidirectional channel.

Substitute parts are grouped into two categories:

Direct Electrical Equivalents: Parts maintaining identical electrical specifications (20V standoff, 22.2V breakdown, 32.4V clamp, 15.4A peak pulse) with active product status and full compliance certifications.

Functionally Compatible Alternatives: Parts with minor parameter variations (clamping voltage up to 43V, peak pulse current up to 16A) that remain within acceptable operating margins for general-purpose TVS applications while maintaining the same voltage class and package form factor.

Parameter Comparison

Part Number	Manufacturer	Status	Standoff (V)	Breakdown Min (V)	Clamp Max (V)	Peak Pulse (A)	Package	Temp Range (°C)
SA20CA-T	Diodes Incorporated	Obsolete	20	22.2	32.4	15.4	DO-15	-65 ~ 175
SA20CA	Taiwan Semiconductor Corporation	Active	20	22.2	43	16	DO-204AC (DO-15)	-55 ~ 175
SA20CA-E3/54	Vishay General Semiconductor	Active	20	22.2	32.4	15.4	DO-204AC (DO-15)	-55 ~ 175
SA20CAHE3/54	Vishay General Semiconductor	Active	20	22.2	32.4	15.4	DO-204AC (DO-15)	-55 ~ 175
P5KE20CA-AP	Micro Commercial Co	Active	20	22.2	32.4	15.4	DO-15	-65 ~ 175
P5KE20CA-BP	Micro Commercial Co	Active	20	22.2	32.4	15.4	DO-15	-65 ~ 175
P5KE20CA-TP	Micro Commercial Co	Active	20	22.2	32.4	15.4	DO-15	-65 ~ 175
SA20CA-AP	Micro Commercial Co	Active	20	22.2	32.4	15.7	DO-15	-55 ~ 175
SA20CA-BP	Micro Commercial Co	Active	20	22.2	32.4	15.7	DO-15	-55 ~ 175
SA20CA-TP	Micro Commercial Co	Active	20	22.2	32.4	15.7	DO-15	-55 ~ 175

Engineering Selection Recommendations

Primary Substitutes (Exact Electrical Match):

SA20CA-E3/54 and SA20CAHE3/54 from Vishay General Semiconductor provide direct electrical equivalence with identical 32.4V clamping voltage and 15.4A peak pulse current. Both parts maintain active product status with ROHS3 compliance and REACH unaffected designation. SA20CAHE3/54 includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

P5KE20CA-AP, P5KE20CA-BP, and P5KE20CA-TP from Micro Commercial Co maintain exact electrical specifications matching the original SA20CA-T, including the extended temperature range of -65°C to 175°C. All three variants are active with REACH unaffected status and support the full operating temperature envelope of the obsolete part.

Secondary Substitute (Functionally Compatible):

SA20CA from Taiwan Semiconductor Corporation offers active product status with slightly elevated clamping voltage (43V maximum) and peak pulse current (16A). This part remains within the 20V voltage class and maintains mechanical compatibility through DO-204AC/DO-15 equivalence. The reduced lower operating temperature limit (-55°C versus -65°C) should be evaluated against application requirements.

Temperature Consideration:

Applications requiring the full -65°C lower temperature limit should prioritize P5KE20CA series variants or the original SA20CA-T equivalent from Diodes Incorporated. Designs with -55°C minimum operating temperature can utilize Vishay or Taiwan Semiconductor alternatives.

Frequently Asked Questions (FAQ)

Q: Can SA20CA-T be directly replaced with SA20CA-E3/54?

A: Yes. SA20CA-E3/54 provides identical electrical specifications (20V standoff, 32.4V clamp, 15.4A peak pulse) in the same DO-15 package configuration. Both are zener-type TVS diodes with single bidirectional channels. The primary difference is packaging format (cut tape versus original bulk), which does not affect electrical performance.

Q: What is the difference between SA20CA-TP and SA20CA-AP?

A: Both parts are manufactured by Micro Commercial Co with identical electrical ratings (20V standoff, 32.4V clamp, 15.7A peak pulse) and package type (DO-15). The suffix designates packaging format: TP indicates cut tape, AP indicates bulk packaging. Electrical performance is equivalent.

Q: Is SA20CA from Taiwan Semiconductor Corporation a suitable replacement?

A: SA20CA maintains the critical 20V standoff voltage and 22.2V breakdown voltage, ensuring voltage class compatibility. The elevated clamping voltage (43V maximum versus 32.4V) and peak pulse current (16A versus 15.4A) represent functional improvements for overvoltage protection. The reduced lower operating temperature limit (-55°C versus -65°C) requires application-specific evaluation.

Q: Why do some substitutes have different peak pulse current ratings (15.4A versus 15.7A or 16A)?

A: Peak pulse current variations reflect manufacturer-specific design margins and measurement conditions within the same voltage class. All parts maintain 500W peak pulse power dissipation and are suitable for general-purpose TVS applications with equivalent circuit protection performance.

Q: Are all substitute parts ROHS3 compliant?

A: SA20CA-E3/54, SA20CAHE3/54, and SA20CA-TP are explicitly ROHS3 compliant. P5KE20CA series and other Micro Commercial Co variants do not list explicit ROHS3 status in provided specifications. Compliance verification with component suppliers is recommended for applications with mandatory ROHS3 requirements.

Q: What is the significance of AEC-Q101 qualification on SA20CAHE3/54?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and qualification. This certification is relevant only for automotive or safety-critical applications. General-purpose industrial applications do not require this qualification.

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