P4SMA47 Equivalent & Substitute Parts

Part Overview

The P4SMA47 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 40.2V reverse standoff voltage with a 68.04V maximum clamping voltage and 6.3A peak pulse current capability in a surface-mount DO-214AC (SMA) package. The P4SMA47 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	40.2V
Voltage - Breakdown (Min)	42.47V
Voltage - Clamping (Max) @ Ipp	68.04V
Current - Peak Pulse (10/1000µs)	6.3A
Power - Peak Pulse	400W
Operating Temperature Range	-65°C ~ 150°C (TJ)
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the P4SMA47 are qualified based on the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 40.2V
Voltage - Clamping (Max) @ Ipp: 64.8V to 68.04V range
Current - Peak Pulse (10/1000µs): 6.2A to 6.3A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener, Unidirectional

All substitute parts maintain the same reverse standoff voltage and comparable clamping voltage performance within acceptable engineering tolerances. Peak pulse current ratings remain at or above 6.2A, and all parts are housed in the same DO-214AC (SMA) surface-mount package.

Parameter Comparison

Parameter	P4SMA47 (Littelfuse)	P4SMA47A (Eaton)	P4SMA47A-M3/61 (Vishay)	SMAJP4KE47A-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	40.2V	40.2V	40.2V	40.2V
Voltage - Breakdown (Min)	42.47V	44.7V	44.7V	44.7V
Voltage - Clamping (Max) @ Ipp	68.04V	64.8V	64.8V	64.8V
Current - Peak Pulse (10/1000µs)	6.3A	6.3A	6.2A	6.3A
Power - Peak Pulse	400W	400W	400W	400W
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	Not specified
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing support, addressing the obsolescence of the original P4SMA47.

P4SMA47A (Eaton - Electronics Division): This direct manufacturer equivalent maintains identical reverse standoff voltage and peak pulse current specifications. It is RoHS compliant and available in high volume (22,400 pcs in stock). The clamping voltage is 64.8V, which is lower than the original 68.04V specification. Operating temperature range is -55°C to 150°C, which is narrower at the lower end compared to the original -65°C minimum.

P4SMA47A-M3/61 (Vishay General Semiconductor - Diodes Division): This manufacturer-recommended substitute is designated as the TransZorb® series equivalent. It maintains the full operating temperature range of -65°C to 150°C, matching the original specification. Peak pulse current is 6.2A, marginally lower than the original 6.3A. Clamping voltage is 64.8V. ROHS3 compliance is confirmed. This part is actively manufactured with 719 units in stock.

SMAJP4KE47A-TP (Micro Commercial Co): This substitute maintains 6.3A peak pulse current and 64.8V clamping voltage. It offers the widest operating temperature range of -55°C to 175°C. REACH compliance is confirmed. This part is actively manufactured with 623 units in stock.

Selection should prioritize product status (all active), compliance certifications (RoHS/ROHS3), and operating temperature requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can P4SMA47A be used as a direct replacement for P4SMA47?

A: P4SMA47A is electrically compatible as a substitute. Both maintain 40.2V reverse standoff voltage and 6.3A peak pulse current. The primary difference is clamping voltage (64.8V vs. 68.04V) and operating temperature range (-55°C to 150°C vs. -65°C to 150°C). Applications requiring the full -65°C lower temperature limit should use P4SMA47A-M3/61 or SMAJP4KE47A-TP instead.

Q: What is the difference between P4SMA47A and P4SMA47A-M3/61?

A: Both parts share identical electrical specifications (40.2V standoff, 64.8V clamping, 6.3A peak pulse). P4SMA47A-M3/61 is the Vishay TransZorb® equivalent with full -65°C to 150°C operating range and ROHS3 compliance. P4SMA47A (Eaton) has a -55°C lower temperature limit. Selection depends on application temperature requirements.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use DO-214AC (SMA) surface-mount packaging, ensuring mechanical and footprint compatibility with the original P4SMA47 design.

Q: Which substitute part has the best availability?

A: P4SMA47A (Eaton) has the highest inventory at 22,400 units in stock, followed by SMAJP4KE47A-TP (623 units) and P4SMA47A-M3/61 (719 units).

Q: What compliance certifications should I verify for my application?

A: P4SMA47A-M3/61 carries ROHS3 compliance matching the original part. P4SMA47A is RoHS compliant. SMAJP4KE47A-TP compliance status is not specified in available data. Verify compliance requirements against your specific application and regional regulations.

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