P4SMA170 Equivalent & Substitute Parts

Part Overview

The P4SMA170 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 145V reverse standoff voltage with a 245.7V maximum clamping voltage and 1.8A peak pulse current capability in a surface-mount DO-214AC (SMA) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

P4SMA170

Littelfuse Inc.In Stock: 748P4SMA170 Datasheet

Current PartRFQ

P4SMA170A

Eaton - Electronics DivisionIn Stock: 5310P4SMA170A Datasheet

MFR RecommendedRFQ

P4SMA170A

Eaton - Electronics DivisionIn Stock: 5310P4SMA170A Datasheet

MFR RecommendedRFQ

SMAJP4KE170A-TP

Micro Commercial CoIn Stock: 775SMAJP4KE170A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4SMA170 is based on electrical and mechanical parameter alignment within the P4SMA series TVS diode family. Valid substitutes must maintain the following critical parameters:

• Reverse standoff voltage: 145V (Typ)
• Peak pulse current: 1.8A
• Peak pulse power: 400W
• Package: DO-214AC (SMA) surface mount
• Unidirectional Zener configuration

The substitute parts identified—P4SMA170A and SMAJP4KE170A-TP—meet these core electrical specifications. Clamping voltage variations (234V to 245.7V) fall within acceptable operating margins for general-purpose transient suppression. Operating temperature ranges differ slightly but remain suitable for standard industrial applications.

Parameter Comparison

Engineering Selection Recommendations

Both P4SMA170A (Eaton) and SMAJP4KE170A-TP (Micro Commercial Co) are active production alternatives to the obsolete P4SMA170. Selection between these substitutes should be based on the following factors:

P4SMA170A (Eaton) is recommended for applications requiring established supply chain continuity within the P4SMA series. This part maintains full RoHS compliance and unlimited moisture sensitivity rating, with 5,300 units currently in stock. The slightly lower clamping voltage (234V vs. 245.7V) provides adequate margin for general-purpose transient suppression.

SMAJP4KE170A-TP (Micro Commercial Co) offers an extended operating temperature range (-55°C to 175°C) suitable for applications requiring higher thermal performance. This part is supplied in bulk packaging and maintains active production status with 723 units available. REACH compliance status is unaffected.

Both substitutes share identical electrical performance in peak pulse current (1.8A) and power dissipation (400W), ensuring direct functional equivalence in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can P4SMA170A be used as a direct replacement for P4SMA170?

A: Yes. Both parts share identical reverse standoff voltage (145V), peak pulse current (1.8A), and package configuration (DO-214AC SMA). The clamping voltage difference (234V vs. 245.7V) is within acceptable operating margins for general-purpose transient suppression circuits.

Q: What is the difference between P4SMA170A and SMAJP4KE170A-TP?

A: Both parts meet the core electrical specifications (145V standoff, 1.8A peak current, 400W power). The primary differences are manufacturer (Eaton vs. Micro Commercial Co), operating temperature range (150°C vs. 175°C maximum), and packaging format (standard vs. bulk). Electrical performance in circuit operation is equivalent.

Q: Are there temperature range limitations when substituting?

A: The original P4SMA170 operates from -65°C to 150°C. Both substitutes operate from -55°C minimum, which is acceptable for most industrial applications. The SMAJP4KE170A-TP extends to 175°C maximum, providing additional thermal margin if required by application specifications.

Q: Do all three parts use the same package?

A: Yes. All three parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and thermal compatibility on PCB layouts without modification.

Q: What compliance certifications apply to these substitutes?

A: P4SMA170A is RoHS compliant. SMAJP4KE170A-TP has REACH unaffected status. Both parts carry EAR99 export classification and HTSUS code 8541.10.0080.