1SMB13CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB13CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi in the DO-214AA (SMB) surface mount package. This component is rated for 13V reverse standoff voltage with a 21.5V maximum clamping voltage and 27.9A peak pulse current, designed for general-purpose transient 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)	13V
Voltage - Breakdown (Min)	14.4V
Voltage - Clamping (Max) @ Ipp	21.5V
Current - Peak Pulse (10/1000µs)	27.9A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C (TJ)
Bidirectional Channels	1
Type	Zener

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB13CAT3 is determined by strict electrical and mechanical parameter matching:

Critical Parameters for Substitution:

Voltage - Reverse Standoff: 13V (exact match required)
Voltage - Clamping (Max) @ Ipp: 21.5V (exact match required)
Current - Peak Pulse (10/1000µs): 27.9A minimum (tolerance range 27.9A to 29A acceptable)
Power - Peak Pulse: 600W (exact match required)
Package / Case: DO-214AA, SMB (exact match required)
Mounting Type: Surface Mount (exact match required)
Bidirectional Channels: 1 (exact match required)

All substitute parts listed meet these electrical specifications within the defined tolerance ranges and maintain identical mechanical compatibility with the original package footprint.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Vc (V)	Ipp (A)	Pp (W)	Package	Status	RoHS
1SMB13CAT3	onsemi	13	21.5	27.9	600	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ13CA	MDD	13	21.5	28	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-13-F	Diodes Incorporated	13	21.5	27.9	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-HR	Littelfuse	13	21.5	28	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-HRA	Littelfuse Inc.	13	21.5	28	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-M3/52	Vishay General Semiconductor - Diodes Division	13	21.5	27.9	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-M3/5B	Vishay General Semiconductor - Diodes Division	13	21.5	27.9	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-TP	Micro Commercial Co	13	21.5	27.9	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ13CA-TR	STMicroelectronics	13	21.5	29	600	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active production components with ROHS3 compliance certification, providing regulatory advantage over the obsolete 1SMB13CAT3. Selection among substitutes should be based on:

Availability and Lead Time: MDD SMBJ13CA and STMicroelectronics SMBJ13CA-TR offer the highest inventory levels (20,461 and 12,800 units respectively), ensuring supply continuity.

Temperature Range Considerations: Littelfuse SMBJ13CA-HR and SMBJ13CA-HRA extend the lower operating temperature to -65°C, matching the original 1SMB13CAT3 specification. Micro Commercial Co SMBJ13CA-TP extends the upper temperature to 175°C, providing enhanced thermal margin.

Peak Pulse Current Tolerance: Parts rated at 28A or 29A (SMBJ13CA, SMBJ13CA-HR, SMBJ13CA-HRA, SMBJ13CA-TR) operate within acceptable tolerance of the original 27.9A specification. Parts rated at exactly 27.9A (SMBJ13CA-13-F, SMBJ13CA-M3/52, SMBJ13CA-M3/5B, SMBJ13CA-TP) provide exact electrical matching.

Packaging Variants: All substitutes maintain DO-214AA (SMB) package compatibility. Tape & Reel (TR) packaging is standard across active production parts, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1SMB13CAT3 with any of the listed substitutes?

A: Yes. All listed parts meet the critical electrical parameters (13V standoff, 21.5V clamping, 600W peak power) and maintain identical DO-214AA SMB package footprint. No circuit redesign is required.

Q: What is the difference between parts rated 27.9A, 28A, and 29A peak pulse current?

A: These variations fall within the acceptable tolerance range for this device category. The 1SMB13CAT3 original specification is 27.9A. Parts rated 28A or 29A provide equivalent protection with slightly higher current handling capability. Selection depends on design margin requirements.

Q: Why is RoHS compliance important for this substitution?

A: The original 1SMB13CAT3 is RoHS non-compliant. All active substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Q: Are there temperature range differences I should consider?

A: Most substitutes operate -55°C to 150°C. Littelfuse variants (SMBJ13CA-HR, SMBJ13CA-HRA) match the original -65°C lower limit. Micro Commercial Co SMBJ13CA-TP extends to 175°C upper limit. Verify your application's thermal requirements before selection.

Q: Can I use these parts interchangeably in existing designs?

A: Yes. All substitutes are pin-compatible and electrically equivalent within specified tolerances. No PCB layout modifications are necessary. Verify datasheet specifications for your specific application requirements.

Q: Which substitute offers the best long-term availability?

A: MDD SMBJ13CA and STMicroelectronics SMBJ13CA-TR are recommended for long-term production due to high inventory levels and active product status from established manufacturers.

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