P4SMA440 Equivalent & Substitute Parts

Part Overview

The P4SMA440 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a DO-214AC (SMA) package with a peak pulse power rating of 400W and a peak pulse current of 700mA. The P4SMA440 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal operating ranges while meeting modern component availability and compliance standards.

Substiute Parts

P4SMA440

Littelfuse Inc.In Stock: 1064P4SMA440 Datasheet

Current PartRFQ

P4SMA440A

Eaton - Electronics DivisionIn Stock: 65229P4SMA440A Datasheet

MFR RecommendedRFQ

P4SMA440A

Eaton - Electronics DivisionIn Stock: 65229P4SMA440A Datasheet

MFR RecommendedRFQ

SMAJP4KE440A-TP

Micro Commercial CoIn Stock: 1014SMAJP4KE440A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA440 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 376V
• Current - Peak Pulse (10/1000µs): 700mA
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC, SMA
• Type: Zener, Unidirectional (1 channel)
• Mounting Type: Surface Mount

Acceptable Variation Parameters:

• Voltage - Breakdown (Min): Within component specification range
• Voltage - Clamping (Max) @ Ipp: Within component specification range
• Operating Temperature Range: May extend beyond original range
• Product Status: Active substitutes preferred for obsolete parts
• Compliance: RoHS and REACH status acceptable as provided

The substitute parts P4SMA440A and SMAJP4KE440A-TP maintain identical standoff voltage, peak pulse current, and power ratings. Both preserve the DO-214AC (SMA) package footprint and surface-mount configuration, ensuring direct circuit board compatibility.

Parameter Comparison

Engineering Selection Recommendations

P4SMA440A (Eaton - Electronics Division) is the primary recommended substitute. This part maintains active product status with established supply chain availability (65,200 pcs in stock). The component is RoHS compliant and carries MSL 1 rating, matching the original part's moisture sensitivity classification. The operating temperature range (-55°C ~ 150°C) covers the lower bound of the original specification, suitable for most general-purpose and telecom applications. Voltage clamping at 602V is lower than the original 632.1V, providing enhanced transient suppression margin.

SMAJP4KE440A-TP (Micro Commercial Co) serves as a secondary substitute option. This part is active with extended operating temperature range (-55°C ~ 175°C), providing thermal headroom for high-temperature environments. The SMAJ variant maintains DO-214AC package compatibility. Lower inventory availability (960 pcs) and bulk packaging may require longer lead times compared to the Eaton option.

Both substitutes are electrically equivalent for applications requiring 376V standoff voltage, 700mA peak pulse current, and 400W peak pulse power. Selection between P4SMA440A and SMAJP4KE440A-TP depends on supply chain requirements, thermal operating conditions, and packaging preferences.

Frequently Asked Questions (FAQ)

Q: Can P4SMA440A directly replace P4SMA440 in existing designs?

A: Yes. The P4SMA440A maintains identical reverse standoff voltage (376V), peak pulse current (700mA), and power rating (400W). The DO-214AC (SMA) package footprint is identical, enabling direct board-level substitution without layout modifications.

Q: What is the difference between the clamping voltages?

A: The P4SMA440 specifies 632.1V maximum clamping voltage, while both substitutes specify 602V. The lower clamping voltage in substitutes provides improved transient suppression performance by limiting voltage peaks to a lower threshold. This is a beneficial characteristic for circuit protection.

Q: Are there temperature range limitations when using substitutes?

A: The P4SMA440A operates from -55°C to 150°C, compared to the original -65°C to 150°C. For applications requiring operation below -55°C, the SMAJP4KE440A-TP extends the lower operating range to -55°C while extending the upper range to 175°C. Verify application temperature requirements before selection.

Q: Is the SMAJ package variant compatible with SMA footprints?

A: Both SMA and SMAJ are DO-214AC package variants with identical footprints and pin configurations. The SMAJP4KE440A-TP is mechanically and electrically compatible with existing P4SMA440 board designs.

Q: What compliance certifications apply to substitute parts?

A: P4SMA440A is RoHS compliant. SMAJP4KE440A-TP carries REACH Unaffected status. Both parts meet EAR99 export classification and HTSUS 8541.10.0080 tariff code, matching the original part's regulatory framework.

Q: How do packaging options affect component selection?

A: P4SMA440A is available in Cut Tape (CT) and Digi-Reel® packaging with 65,200 pcs inventory. SMAJP4KE440A-TP is supplied in bulk packaging with 960 pcs inventory. For production volumes, the Eaton option provides standard tape-and-reel formats suitable for automated assembly. Bulk packaging may require manual handling or custom reel preparation.