1SMB17CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB17CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 17V reverse standoff voltage with a 27.6V maximum clamping voltage and 21.7A peak pulse current capability in the DO-214AA (SMB) package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	18.9	V
Voltage - Clamping (Max) @ Ipp	27.6	V
Current - Peak Pulse (10/1000µs)	21.7	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—
Type	Zener	—
Applications	General Purpose	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1SMB17CAT3 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 17V
Voltage - Breakdown (Min): 18.9V
Voltage - Clamping (Max) @ Ipp: 27.6V
Current - Peak Pulse (10/1000µs): 21.7A (±0.04A tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener
Applications: General Purpose

Substitute parts are classified into two categories:

Direct Equivalents: Parts meeting all electrical specifications with identical clamping voltage (27.6V) and peak pulse current (21.7A ±0.04A).

Similar Alternatives: Parts meeting core voltage and current specifications but with minor variations in clamping voltage or operating temperature range that remain within acceptable design margins for general-purpose protection applications.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) V	VBR (Min) V	VC (Max) @ Ipp V	Ipp (10/1000µs) A	PPP W	Package	Product Status	RoHS Status
1SMB17CAT3	onsemi	17	18.9	27.6	21.7	600	DO-214AA (SMB)	Obsolete	Non-compliant
SMBJ17CA	Meritek	17	18.9	27.6	21.74	600	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ17CA-13-F	Diodes Incorporated	17	18.9	27.6	21.7	600	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ17CA-TP	Micro Commercial Co	17	18.9	27.6	21.7	600	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ17CAE3/TR13	Microchip Technology	17	18.9	27.6	21.7	600	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ17CE3/TR13	Microchip Technology	17	18.9	30.5	19.7	600	DO-214AA (SMB)	Active	ROHS3 Compliant
TV06B170JB-G	Comchip Technology	17	18.9	27.6	21.74	600	DO-214AA (SMB)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

SMBJ17CA (Meritek), SMBJ17CA-13-F (Diodes Incorporated), SMBJ17CA-TP (Micro Commercial Co), SMBJ17CAE3/TR13 (Microchip Technology), and TV06B170JB-G (Comchip Technology) are direct functional equivalents to the 1SMB17CAT3. All maintain identical reverse standoff voltage (17V), breakdown voltage (18.9V minimum), clamping voltage (27.6V maximum), and peak pulse current (21.7A ±0.04A). All substitute parts are in active production status with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance of the original part.

Secondary Alternative (Modified Clamping Characteristics):

SMBJ17CE3/TR13 (Microchip Technology) maintains the same reverse standoff voltage (17V) and breakdown voltage (18.9V) but features a higher clamping voltage of 30.5V with reduced peak pulse current of 19.7A. This part is suitable for applications where slightly higher clamping voltage is acceptable and peak pulse current requirements do not exceed 19.7A.

Compliance Considerations:

All active substitute parts carry ROHS3 compliance certification, making them suitable for designs requiring regulatory compliance. The original 1SMB17CAT3 is RoHS non-compliant; substitution with any listed alternative addresses this compliance gap.

Frequently Asked Questions (FAQ)

Q: Can SMBJ17CE3/TR13 be used as a direct replacement for 1SMB17CAT3?

A: SMBJ17CE3/TR13 is functionally compatible for general-purpose overvoltage protection but with design considerations. The clamping voltage is 30.5V (versus 27.6V) and peak pulse current is 19.7A (versus 21.7A). Use this part only if your circuit design accommodates the higher clamping voltage and lower peak pulse current specification.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with the original 1SMB17CAT3 footprint.

Q: What is the difference between SMBJ17CA from different manufacturers?

A: SMBJ17CA is offered by multiple manufacturers (Meritek, Diodes Incorporated, Micro Commercial Co, Microchip Technology) with identical electrical specifications. Selection may be based on availability, lead time, pricing, or supply chain preference. All maintain the same 17V reverse standoff, 27.6V clamping voltage, and 21.7A peak pulse current.

Q: Does substitution require circuit re-qualification?

A: All listed substitute parts meet the electrical and mechanical parameters of the original 1SMB17CAT3. Circuit re-qualification is not required for direct electrical equivalents (SMBJ17CA variants, SMBJ17CAE3/TR13, TV06B170JB-G). For SMBJ17CE3/TR13, verify that the higher clamping voltage (30.5V) and lower peak pulse current (19.7A) are acceptable for your specific application.

Q: Are these parts suitable for power line protection applications?

A: The 1SMB17CAT3 and all listed substitutes are designated for general-purpose applications. None are specified for power line protection. Verify application requirements before selection.

Q: What is the moisture sensitivity level for substitute parts?

A: All substitute parts carry MSL 1 (Unlimited) rating, matching the original 1SMB17CAT3 specification. No special moisture control measures are required during storage or handling.

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