Littelfuse P4SMA510 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse P4SMA510 is a unidirectional Zener transient voltage suppressor (TVS) diode in DO-214AC (SMA) surface mount package, designed for general-purpose overvoltage protection applications. With a reverse standoff voltage of 434V and peak pulse current rating of 600mA, this component provides transient suppression in high-voltage circuits.

The P4SMA510 is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	434	V
Voltage - Breakdown (Min)	460.75	V
Voltage - Clamping (Max) @ Ipp	732.9	V
Current - Peak Pulse (10/1000µs)	600	mA
Power - Peak Pulse	400	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA510 is determined by the following critical parameters:

Reverse standoff voltage: 434V (Typ)
Peak pulse current: 600mA
Power dissipation: 400W peak pulse
Package type: DO-214AC (SMA) surface mount
Unidirectional configuration: 1 channel
Zener diode type

Substitute parts must maintain identical or functionally equivalent values across these parameters to ensure proper circuit protection without altering transient suppression characteristics. Clamping voltage variations within the specified range do not disqualify substitution when other electrical parameters remain compatible.

Parameter Comparison

Parameter	P4SMA510 (Main)	P4SMA510A (Direct)	SMAJP4KE510A-TP (MFR Recommended)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co
Product Status	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	434V	434V	434V
Voltage - Breakdown (Min)	460.75V	485V	485V
Voltage - Clamping (Max) @ Ipp	732.9V	698V	698V
Current - Peak Pulse (10/1000µs)	600mA	600mA	600mA
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	-55°C to 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMAJ
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

P4SMA510A (Littelfuse Inc.) is the primary direct substitute. This part maintains active product status with identical electrical specifications and operating temperature range. It is manufactured by the original equipment supplier and carries ROHS3 compliance with REACH unaffected status. Packaging is supplied in Tape & Reel format with significantly higher inventory availability (40,400 units).

SMAJP4KE510A-TP (Micro Commercial Co) is the manufacturer-recommended alternative. This part is active and meets all critical electrical parameters. Operating temperature range extends to 175°C maximum junction temperature, providing enhanced thermal performance. Package designation is DO-214AC (SMAJ) with ROHS3 compliance and REACH unaffected status. Inventory availability is 1,116 units in bulk packaging.

Both substitute parts satisfy the electrical and mechanical requirements for direct replacement in applications designed for the P4SMA510.

Frequently Asked Questions (FAQ)

Q: Can P4SMA510A be used as a direct replacement for P4SMA510?

A: Yes. The P4SMA510A maintains identical reverse standoff voltage (434V), peak pulse current (600mA), and power dissipation (400W). Operating temperature range is identical (-65°C to 150°C). Both use DO-214AC (SMA) surface mount packaging. The primary difference is product status: P4SMA510A is active production while P4SMA510 is obsolete.

Q: What is the difference between P4SMA510A and SMAJP4KE510A-TP?

A: Both parts share identical reverse standoff voltage, peak pulse current, and power ratings. The SMAJP4KE510A-TP offers an extended operating temperature range (-55°C to 175°C) compared to P4SMA510A (-65°C to 150°C). The SMAJP4KE510A-TP is manufactured by Micro Commercial Co rather than Littelfuse Inc. Package designation differs slightly (SMAJ versus SMA), though both are DO-214AC form factor.

Q: Are there any clamping voltage differences between these parts?

A: The P4SMA510 specifies maximum clamping voltage of 732.9V at peak pulse current. Both P4SMA510A and SMAJP4KE510A-TP specify 698V maximum clamping voltage. This represents a lower clamping voltage in the substitute parts, which provides improved transient suppression performance without affecting circuit compatibility.

Q: What packaging formats are available?

A: P4SMA510A is supplied in Tape & Reel (TR) format. SMAJP4KE510A-TP is supplied in bulk packaging. Both are surface mount DO-214AC packages suitable for automated assembly processes.

Q: Are these parts RoHS compliant?

A: Yes. All three parts (P4SMA510, P4SMA510A, and SMAJP4KE510A-TP) are ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life). SMAJP4KE510A-TP and P4SMA510A carry REACH unaffected status.

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