P4SMA11C Equivalent & Substitute Parts

Part Overview

The P4SMA11C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 9.4V reverse standoff voltage with a 16.38V maximum clamping voltage and 26.3A peak pulse current capability in a DO-214AC (SMA) package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

P4SMA11C

Littelfuse Inc.In Stock: 1149P4SMA11C Datasheet

Current PartRFQ

P4SMA11CA

Eaton - Electronics DivisionIn Stock: 23782P4SMA11CA Datasheet

DirectRFQ

P4SMA11CA

Eaton - Electronics DivisionIn Stock: 23782P4SMA11CA Datasheet

DirectRFQ

SMAJP4KE11CA-TP

Micro Commercial CoIn Stock: 706SMAJP4KE11CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA11C is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

• Reverse standoff voltage: 9.4V (Typ)
• Peak pulse current: 26.3A (10/1000µs)
• Peak pulse power: 400W
• Package type: DO-214AC or SMA variant
• Bidirectional channels: 1
• Mounting type: Surface Mount
• Zener diode type classification

Allowable Variation Parameters:

• Clamping voltage (Max) @ Ipp: Substitute parts may vary within the range of 15.6V to 16.38V
• Breakdown voltage (Min): Substitute parts may vary within the range of 10.5V to 9.98V
• Operating temperature range: Substitute parts may have equal or extended temperature ranges

The identified substitutes meet these criteria and maintain functional compatibility for the intended application.

Parameter Comparison

Engineering Selection Recommendations

P4SMA11CA (Eaton - Electronics Division) is the primary substitute for the obsolete P4SMA11C. This part maintains identical reverse standoff voltage (9.4V) and peak pulse current (26.3A) specifications. The clamping voltage is reduced to 15.6V, which is within acceptable tolerance for equivalent circuit protection. The part is actively manufactured and widely available (23750 units in stock), with RoHS compliance certification. The operating temperature range of -55°C to 150°C covers standard industrial applications, though the lower minimum temperature (-55°C versus -65°C) should be verified against specific system requirements.

SMAJP4KE11CA-TP (Micro Commercial Co) serves as a secondary substitute option. This part matches all critical electrical parameters and offers an extended operating temperature range to 175°C, providing additional thermal margin for high-temperature applications. The SMAJ package variant is mechanically compatible with standard SMA footprints. Inventory availability is lower (689 units), and REACH compliance status differs from the primary substitute.

Selection between these substitutes should be based on application-specific temperature requirements, supply chain availability, and compliance certifications required by the end system.

Frequently Asked Questions (FAQ)

Q: Can P4SMA11CA be used as a direct replacement for P4SMA11C?

A: Yes. Both parts share identical reverse standoff voltage (9.4V), peak pulse current (26.3A), and peak pulse power (400W) specifications. The clamping voltage difference (15.6V versus 16.38V) represents a 4.8% reduction, which remains within acceptable protection margins for general-purpose transient suppression applications.

Q: What is the difference between the SMA and SMAJ package variants?

A: Both SMA and SMAJ are DO-214AC package designations used for surface-mount TVS diodes. The SMAJ variant (used in SMAJP4KE11CA-TP) is mechanically compatible with standard SMA footprints and PCB layouts. No design modification is required for package substitution.

Q: Are there temperature range limitations when substituting?

A: The P4SMA11C operates from -65°C to 150°C. The P4SMA11CA operates from -55°C to 150°C, representing a 10°C reduction in minimum operating temperature. Applications requiring operation below -55°C should verify compatibility with system thermal specifications. The SMAJP4KE11CA-TP extends the upper limit to 175°C, suitable for elevated-temperature environments.

Q: What compliance certifications apply to these substitutes?

A: P4SMA11CA is RoHS compliant. SMAJP4KE11CA-TP is REACH unaffected. Both parts carry EAR99 export classification and HTSUS code 8541.10.0080. System-level compliance requirements should be verified against end-application standards.

Q: How do the clamping voltage specifications affect circuit protection?

A: Clamping voltage determines the maximum voltage presented to protected circuitry during a transient event. The P4SMA11C clamps at 16.38V maximum, while both substitutes clamp at 15.6V maximum. Lower clamping voltage provides slightly improved protection margin. Both values remain within typical design tolerances for 9.4V standoff applications.

Q: What inventory considerations apply to these substitutes?

A: P4SMA11CA is available in high volume (23750 units) from Eaton, providing reliable long-term supply. SMAJP4KE11CA-TP has lower availability (689 units) from Micro Commercial Co. For production designs, P4SMA11CA is recommended due to superior supply chain stability.