P6SMBJ47C Equivalent & Substitute Parts

Part Overview

The P6SMBJ47C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates with a reverse standoff voltage of 40.2V and provides clamping at 68.04V with a peak pulse current of 9.4A. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued circuit protection functionality.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	40.2V
Voltage - Breakdown (Min)	42.35V
Voltage - Clamping (Max) @ Ipp	68.04V
Current - Peak Pulse (10/1000µs)	9.4A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
Type	Zener
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitution of the P6SMBJ47C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 40.2V (Typ)
Voltage clamping range: 64.8V to 68.04V @ Ipp
Peak pulse current capability: minimum 9.4A
Power dissipation: 600W or greater
Package type: DO-214AA or SMB (surface mount)
Operating temperature range: minimum -55°C to 150°C
Bidirectional configuration: single channel
Type: Zener diode

Substitute parts are grouped into two categories based on peak pulse current rating:

Category A (9.3A - 9.4A Peak Pulse Current): Direct electrical equivalents with identical current handling and power dissipation (600W). These parts maintain the same thermal and electrical performance envelope as the original P6SMBJ47C.

Category B (15.4A Peak Pulse Current / 1kW Power Rating): Enhanced performance alternatives with higher current capacity and power dissipation. These parts provide superior transient protection capability while maintaining voltage compatibility and package form factor.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Reverse Standoff (Typ)	Clamping Voltage @ Ipp	Peak Pulse Current	Power Rating	Operating Temp Range	Package	Product Status
P6SMBJ47C	Littelfuse Inc.	40.2V	68.04V	9.4A	600W	-55°C ~ 150°C	DO-214AA (SMBJ)	Obsolete
P6SMB47CA	Eaton - Electronics Division	40.2V	64.8V	9.4A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJP6KE47CA-TP	Micro Commercial Co	40.2V	64.8V	9.4A	600W	-55°C ~ 175°C	DO-214AA (SMBJ)	Active
1KSMB47CA	Taiwan Semiconductor Corporation	40.2V	64.8V	15.4A	1000W	-55°C ~ 175°C	DO-214AA (SMB)	Active
1KSMB47CAH	Taiwan Semiconductor Corporation	40.2V	64.8V	15.4A	1000W	-55°C ~ 175°C	DO-214AA (SMB)	Active
P6SMB47CA-E3/52	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	9.3A	600W	-65°C ~ 150°C	DO-214AA (SMB)	Active
P6SMB47CA-E3/5B	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	9.3A	600W	-65°C ~ 150°C	DO-214AA (SMB)	Active
P6SMB47CA-M3/52	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	9.3A	600W	-65°C ~ 150°C	DO-214AA (SMBJ)	Active
P6SMB47CA-M3/5B	Vishay General Semiconductor - Diodes Division	40.2V	64.8V	9.3A	600W	-65°C ~ 150°C	DO-214AA (SMBJ)	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: P6SMB47CA (Eaton) and SMBJP6KE47CA-TP (Micro Commercial Co) are direct electrical and mechanical equivalents. Both maintain the 40.2V standoff voltage, 64.8V clamping voltage, 9.4A peak pulse current, and 600W power rating. Both are active products with RoHS3 compliance. SMBJP6KE47CA-TP offers extended operating temperature range (-55°C to 175°C) compared to the original specification.

Secondary Recommendation - Enhanced Performance: P6SMB47CA-E3/52, P6SMB47CA-E3/5B, P6SMB47CA-M3/52, and P6SMB47CA-M3/5B (Vishay) provide equivalent electrical performance with extended lower temperature rating (-65°C minimum). These parts are available in both tape & reel and tape & box packaging options.

Higher Current Alternative: 1KSMB47CA and 1KSMB47CAH (Taiwan Semiconductor Corporation) provide enhanced transient protection with 15.4A peak pulse current and 1000W power rating. These parts maintain voltage compatibility and are suitable for applications requiring higher surge current capacity. The 1KSMB47CAH variant includes AEC-Q101 automotive qualification.

All recommended substitutes are active products with RoHS3 compliance and surface mount DO-214AA/SMB packaging compatible with the original P6SMBJ47C footprint.

Frequently Asked Questions (FAQ)

Q: Can P6SMB47CA directly replace P6SMBJ47C in existing designs? A: Yes. P6SMB47CA maintains identical reverse standoff voltage (40.2V), peak pulse current (9.4A), and power rating (600W). Both use DO-214AA/SMB surface mount packaging. The primary difference is clamping voltage: P6SMBJ47C clamps at 68.04V while P6SMB47CA clamps at 64.8V, which is within acceptable tolerance for general-purpose transient suppression.

Q: What is the difference between the Vishay variants (E3/52, E3/5B, M3/52, M3/5B)? A: The suffix designations indicate packaging and tape configuration. E3 variants use tape & reel (TR) packaging, while M3 variants use tape & box (TB) packaging. The /52 and /5B suffixes denote different tape specifications. All four variants maintain identical electrical specifications: 40.2V standoff, 64.8V clamping, 9.3A peak pulse current, and 600W power rating.

Q: Should I use the 1KSMB47CA for higher surge protection? A: The 1KSMB47CA and 1KSMB47CAH provide 15.4A peak pulse current and 1000W power rating compared to 9.4A and 600W for direct equivalents. Use these higher-rated parts only if circuit analysis confirms the need for enhanced transient protection. Both maintain 40.2V standoff and 64.8V clamping voltage compatibility.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitute parts are RoHS3 compliant. The 1KSMB47CAH additionally carries AEC-Q101 automotive qualification for applications requiring automotive-grade components.

Q: What is the operating temperature difference between substitutes? A: The original P6SMBJ47C and most direct equivalents operate from -55°C to 150°C. SMBJP6KE47CA-TP extends the upper limit to 175°C. Vishay variants (P6SMB47CA-E3 and M3 series) extend the lower limit to -65°C. The 1KSMB47CA and 1KSMB47CAH also operate to 175°C. Select based on specific thermal requirements of the application.

Q: Is package compatibility guaranteed between DO-214AA and SMB designations? A: Yes. DO-214AA and SMB refer to the same physical package form factor used for surface mount diodes. All substitute parts listed use this identical package, ensuring PCB footprint compatibility with the original P6SMBJ47C design.

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