1KSMB47C Equivalent & Substitute Parts

Part Overview

The 1KSMB47C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 40.2V reverse standoff voltage with a 68.04V maximum clamping voltage and 15.4A peak pulse current capability in a DO-214AA (SMB) package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	40.2V
Voltage - Breakdown (Min)	42.35V
Voltage - Clamping (Max) @ Ipp	68.04V
Current - Peak Pulse (10/1000µs)	15.4A
Power - Peak Pulse	1000W
Bidirectional Channels	1
Operating Temperature Range	-55°C ~ 150°C
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1KSMB47C is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 40.2V to maintain circuit protection threshold
Bidirectional Channels: Must be 1 channel
Package / Case: Must be DO-214AA or SMB compatible for PCB footprint compatibility
Mounting Type: Must be Surface Mount
Current - Peak Pulse (10/1000µs): Minimum 9.4A acceptable; 15.4A preferred for full performance equivalence
Power - Peak Pulse: Minimum 600W acceptable; 1000W preferred for full performance equivalence
Voltage - Clamping (Max) @ Ipp: Range 64.8V to 68.04V acceptable for protection circuit operation

The substitute parts listed maintain the core voltage protection characteristics while accommodating minor variations in peak pulse current and clamping voltage within acceptable engineering tolerances for general-purpose TVS applications.

Parameter Comparison

Parameter	1KSMB47C (Littelfuse)	1KSMB47CA (Taiwan Semiconductor)	P6SMB47CA (Eaton)	SMBJP6KE47CA-TP (Micro Commercial Co)
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor Corporation	Eaton - Electronics Division	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	40.2V	40.2V	40.2V	40.2V
Voltage - Breakdown (Min)	42.35V	44.7V	44.7V	44.7V
Voltage - Clamping (Max) @ Ipp	68.04V	64.8V	64.8V	64.8V
Current - Peak Pulse (10/1000µs)	15.4A	15.4A	9.4A	9.4A
Power - Peak Pulse	1000W	1000W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1KSMB47CA (Taiwan Semiconductor Corporation) provides the closest electrical equivalence to the 1KSMB47C, maintaining identical peak pulse current (15.4A) and power dissipation (1000W) ratings. This part is active in production with ROHS3 compliance and extended operating temperature range to 175°C. This is the preferred direct substitute.

SMBJP6KE47CA-TP (Micro Commercial Co) offers the highest inventory availability and extended temperature range to 175°C with ROHS3 compliance. The reduced peak pulse current (9.4A) and power rating (600W) are acceptable for applications where the full 15.4A pulse capability is not required. This part is suitable for general-purpose protection circuits with moderate transient energy levels.

P6SMB47CA (Eaton - Electronics Division) maintains the same voltage protection characteristics with reduced peak pulse current (9.4A) and power rating (600W). Operating temperature range matches the original part at -55°C to 150°C. This option is suitable for applications with lower transient energy requirements and offers good inventory availability.

All substitute parts maintain ROHS3 or RoHS compliance and are actively produced, ensuring long-term component availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use P6SMB47CA or SMBJP6KE47CA-TP as direct replacements for 1KSMB47C?

A: Yes, both parts are functionally compatible. The 1KSMB47C, P6SMB47CA, and SMBJP6KE47CA-TP all maintain the 40.2V reverse standoff voltage and 64.8V clamping voltage required for circuit protection. The primary difference is peak pulse current: the original part and 1KSMB47CA support 15.4A, while P6SMB47CA and SMBJP6KE47CA-TP support 9.4A. Selection depends on your circuit's transient energy requirements.

Q: What is the difference between the clamping voltages (68.04V vs 64.8V)?

A: The 1KSMB47C has a maximum clamping voltage of 68.04V, while the substitute parts specify 64.8V. Both values fall within acceptable protection ranges for general-purpose TVS applications. The lower clamping voltage of the substitutes provides slightly tighter voltage regulation during transient events.

Q: Are all substitute parts pin-compatible with the original 1KSMB47C?

A: Yes. All parts use the DO-214AA (SMB) surface-mount package, which provides identical PCB footprint and pin configuration. No layout modifications are required for substitution.

Q: Which substitute part should I choose for new designs?

A: For new designs, 1KSMB47CA is recommended due to its full electrical equivalence (15.4A peak pulse current, 1000W power rating) and active production status. If inventory or cost considerations are primary factors, SMBJP6KE47CA-TP offers the highest stock availability with acceptable performance for general-purpose applications.

Q: Do all parts meet RoHS compliance requirements?

A: Yes. The 1KSMB47C is ROHS3 compliant. All substitute parts are either ROHS3 or RoHS compliant, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: What is the operating temperature difference between parts?

A: The 1KSMB47C operates from -55°C to 150°C. The 1KSMB47CA and SMBJP6KE47CA-TP extend the upper limit to 175°C, providing additional thermal margin for high-temperature applications. P6SMB47CA matches the original temperature range.

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