1KSMB13CA Equivalent & Substitute Parts

Part Overview

The 1KSMB13CA is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode operates with an 11.1V reverse standoff voltage and provides 18.2V clamping at peak pulse current, delivering 1000W peak pulse power dissipation in a compact DO-214AA (SMB) package. Substitute parts are necessary when the primary manufacturer part is unavailable, when alternative packaging formats are required, or when inventory constraints necessitate equivalent alternatives from qualified manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	1KSMB13CA
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	11.1V
Voltage - Breakdown (Min)	12.4V
Voltage - Clamping (Max) @ Ipp	18.2V
Current - Peak Pulse (10/1000µs)	54.9A
Power - Peak Pulse	1000W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 1KSMB13CA is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 11.1V ± tolerance
Voltage - Breakdown (Min): 12.4V minimum
Voltage - Clamping (Max) @ Ipp: 18.2V maximum
Package / Case: DO-214AA (SMB) form factor
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener

Substitute parts must maintain identical voltage specifications and package geometry to ensure direct functional replacement. Peak pulse current and power dissipation may vary within acceptable ranges provided the clamping voltage and standoff voltage remain within specification. All substitute parts listed are active products with ROHS3 compliance.

Parameter Comparison

Parameter	1KSMB13CA (Littelfuse)	P6SMB13CA-E3/52 (Vishay)	SMBJ11CA (Fairchild)	SMBJP6KE13CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	11.1V	11.1V	11V	11.1V
Voltage - Breakdown (Min)	12.4V	12.4V	12.2V	12.4V
Voltage - Clamping (Max) @ Ipp	18.2V	18.2V	18.2V	18.2V
Current - Peak Pulse (10/1000µs)	54.9A	33A	33A	34.6A
Power - Peak Pulse	1000W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain the critical voltage parameters (11.1V standoff, 12.4V breakdown, 18.2V clamping) required for functional equivalence with the 1KSMB13CA. Selection among substitutes should be based on the following criteria:

P6SMB13CA-E3/52 (Vishay General Semiconductor): This part offers extended lower operating temperature range (-65°C minimum) and is supplied in Tape & Reel packaging. Peak pulse current is reduced to 33A with 600W power dissipation, suitable for applications where the 1KSMB13CA's 54.9A capability exceeds system requirements. ROHS3 compliant.

SMBJ11CA (Fairchild Semiconductor): This part maintains the same voltage clamping specification with 33A peak pulse current and 600W power dissipation. Supplied in bulk packaging. Reverse standoff voltage is 11V (0.1V lower than primary part). Product status is active; RoHS compliance status is not specified in available data.

SMBJP6KE13CA-TP (Micro Commercial Co): This part provides the highest operating temperature range (-55°C to 175°C) and is supplied in Tape & Reel packaging. Peak pulse current is 34.6A with 600W power dissipation. Voltage specifications match the primary part exactly. ROHS3 compliant.

All substitute parts are active products suitable for direct replacement in general-purpose overvoltage protection applications where the DO-214AA package and specified voltage parameters are required.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB13CA be directly replaced with P6SMB13CA-E3/52?

A: Yes. Both parts maintain identical voltage specifications (11.1V standoff, 12.4V breakdown, 18.2V clamping) and use the DO-214AA package. The substitute has lower peak pulse current (33A vs 54.9A) and power dissipation (600W vs 1000W), making it suitable for applications not requiring the higher current capability of the primary part.

Q: What is the difference between the SMBJ11CA and other substitutes?

A: The SMBJ11CA has a reverse standoff voltage of 11V compared to 11.1V for other parts. This 0.1V difference falls within typical tolerance ranges for TVS diodes. Peak pulse current and power dissipation are 33A and 600W respectively. The part is supplied in bulk packaging rather than tape and reel.

Q: Are all substitute parts ROHS3 compliant?

A: P6SMB13CA-E3/52 and SMBJP6KE13CA-TP are explicitly ROHS3 compliant. SMBJ11CA RoHS compliance status is not specified in available documentation.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range does not affect functional substitution eligibility for the voltage protection function. However, application-specific thermal requirements may influence part selection. SMBJP6KE13CA-TP offers the widest range (-55°C to 175°C), while P6SMB13CA-E3/52 extends to -65°C minimum.

Q: Can I use a substitute with lower peak pulse current rating?

A: Yes, provided the application's transient current does not exceed the substitute part's rating. All listed substitutes are rated for 33A or 34.6A peak pulse current. If your circuit requires the full 54.9A capability of the 1KSMB13CA, substitutes with lower ratings are not suitable.

Q: Are packaging format differences significant?

A: Packaging format (Tape & Reel vs Bulk) affects procurement and assembly processes but does not impact electrical function. All parts use the same DO-214AA (SMB) physical package for PCB mounting.

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