P4SMA350C Equivalent & Substitute Parts

Part Overview

The P4SMA350C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications. This component features a 300V reverse standoff voltage with a 506.1V maximum clamping voltage and 900mA peak pulse current capability in a surface-mount DO-214AC (SMA) package. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

P4SMA350C

Littelfuse Inc.In Stock: 989P4SMA350C Datasheet

Current PartRFQ

P4SMA350CA

Eaton - Electronics DivisionIn Stock: 10366P4SMA350CA Datasheet

DirectRFQ

P4SMA350CA

Eaton - Electronics DivisionIn Stock: 10366P4SMA350CA Datasheet

DirectRFQ

SMAJ300CA

MeritekIn Stock: 5114SMAJ300CA Datasheet

MFR RecommendedRFQ

SMAJ300CA-TP

Micro Commercial CoIn Stock: 5979SMAJ300CA-TP Datasheet

MFR RecommendedRFQ

SMAJP4KE350CA-TP

Micro Commercial CoIn Stock: 997SMAJP4KE350CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA350C is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Reverse Standoff Voltage: 300V (Typ)
• Package Type: DO-214AC (SMA) surface mount
• Bidirectional Configuration: Single channel
• Peak Pulse Current: 900mA nominal
• Power Dissipation: 400W peak pulse
• Zener diode type with transient suppression function

Acceptable Variation Ranges:

• Voltage - Breakdown (Min): 315.4V to 335V
• Voltage - Clamping (Max) @ Ipp: 482V to 506.1V
• Current - Peak Pulse: 800mA to 900mA
• Operating Temperature: -55°C minimum to 150°C minimum

All substitute parts listed maintain the core electrical characteristics and mechanical compatibility required for direct replacement in the original application circuit.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: P4SMA350CA (Eaton - Electronics Division)

The P4SMA350CA is the direct equivalent replacement for the obsolete P4SMA350C. This part maintains identical electrical specifications including 300V reverse standoff voltage, 900mA peak pulse current, and 400W power dissipation. The component is currently in active production status with 10,300 units in stock. It carries RoHS compliance certification and is available in Tape & Reel packaging for automated assembly. The operating temperature range is -55°C to 150°C, which covers the majority of industrial applications, though it does not extend to the original part's -65°C lower limit.

Secondary Substitutes: SMAJ300CA-TP and SMAJP4KE350CA-TP (Micro Commercial Co)

Both Micro Commercial Co parts provide active-status alternatives with extended operating temperature ranges up to 175°C. The SMAJP4KE350CA-TP maintains the full 900mA peak pulse current specification, while the SMAJ300CA-TP operates at 800mA. Both parts are ROHS3 compliant and available in surface-mount DO-214AC packaging. The SMAJ300CA-TP is available in Tape & Reel format, while the SMAJP4KE350CA-TP is supplied in bulk packaging.

Tertiary Substitute: SMAJ300CA (Meritek)

The SMAJ300CA provides an alternative from Meritek with 300V reverse standoff voltage and 400W power dissipation. This part operates at 820mA peak pulse current and includes ROHS3 compliance. Operating temperature range is -55°C to 150°C. Availability is 5,100 units in stock.

All substitute parts maintain the critical DO-214AC (SMA) surface-mount package format and single-channel bidirectional configuration required for direct circuit board replacement.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA350CA directly replace the obsolete P4SMA350C?

A: Yes. The P4SMA350CA is a direct equivalent with identical reverse standoff voltage (300V), peak pulse current (900mA), power dissipation (400W), and package type (DO-214AC, SMA). The primary difference is the operating temperature minimum of -55°C versus the original -65°C. For applications operating above -55°C, this part is a complete substitute.

Q: What is the difference between the clamping voltage specifications across substitute parts?

A: The P4SMA350C specifies a maximum clamping voltage of 506.1V at peak pulse current. Substitute parts range from 482V to 486V. These variations remain within acceptable transient suppression performance for the 300V standoff voltage class. The lower clamping voltages in substitute parts provide equivalent or improved protection characteristics.

Q: Are all substitute parts RoHS compliant?

A: The P4SMA350CA (Eaton) carries RoHS compliance certification. The SMAJ300CA-TP and SMAJ300CA (Micro Commercial Co and Meritek) are ROHS3 compliant. The SMAJP4KE350CA-TP RoHS status is not specified in the provided data. Verify RoHS requirements with your procurement specifications before final selection.

Q: Which substitute part has the best temperature performance?

A: The SMAJ300CA-TP and SMAJP4KE350CA-TP both support operating temperatures up to 175°C, compared to 150°C for the P4SMA350CA and SMAJ300CA. Select these parts if your application requires extended high-temperature operation.

Q: What packaging options are available for these substitutes?

A: The P4SMA350CA is available in Tape & Reel format. The SMAJ300CA-TP is supplied in Tape & Reel. The SMAJP4KE350CA-TP is available in bulk packaging. The SMAJ300CA packaging format is not specified. Confirm packaging requirements with your assembly process before ordering.

Q: Is the 820mA or 800mA peak pulse current in the Meritek and Micro Commercial Co parts acceptable?

A: The original P4SMA350C and direct equivalent P4SMA350CA both specify 900mA peak pulse current. The SMAJ300CA operates at 820mA and the SMAJ300CA-TP at 800mA. These lower current ratings remain within the 400W power dissipation envelope and provide adequate transient suppression for 300V standoff applications. Verify your circuit's peak pulse current requirements before selecting lower-rated alternatives.

Q: Can I use these parts interchangeably on the same circuit board?

A: Yes, all substitute parts use the identical DO-214AC (SMA) surface-mount package and maintain the same pinout configuration. They are mechanically and electrically compatible for direct board-level substitution without layout modifications.