P6SMB540 Equivalent & Substitute Parts

Part Overview

The P6SMB540 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 460V reverse standoff voltage with a 777V maximum clamping voltage and 800mA peak pulse current capability in a surface-mount DO-214AA (SMB) package. The part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

P6SMB540

Littelfuse Inc.In Stock: 916P6SMB540 Datasheet

Current PartRFQ

P6SMB540A

Eaton - Electronics DivisionIn Stock: 15498P6SMB540A Datasheet

DirectRFQ

P6SMB540A

Eaton - Electronics DivisionIn Stock: 15498P6SMB540A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB540 is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 460V
• Voltage - Clamping (Max) @ Ipp: Must remain within acceptable operating margins
• Current - Peak Pulse (10/1000µs): 800mA
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Package / Case: DO-214AA, SMB (surface-mount compatibility)
• Operating Temperature Range: -55°C to 150°C (TJ)

The P6SMB540A from Eaton - Electronics Division meets these substitution criteria. Both parts share identical reverse standoff voltage, peak pulse current, power dissipation, temperature range, and package specifications. The clamping voltage differential (777V vs. 740V) remains within acceptable operational tolerance for general-purpose protection applications where the standoff voltage is the primary design constraint.

Parameter Comparison

Engineering Selection Recommendations

The P6SMB540A (Eaton - Electronics Division) is the qualified substitute for the obsolete P6SMB540 (Littelfuse Inc.). Selection is based on the following engineering criteria:

• Both parts maintain identical reverse standoff voltage (460V), the primary design parameter for TVS diode selection in overvoltage protection circuits.
• Peak pulse current and power dissipation specifications are equivalent (800mA, 600W), ensuring identical transient suppression capability.
• Package and mounting specifications are identical (DO-214AA, SMB surface mount), permitting direct PCB layout compatibility without redesign.
• Operating temperature range is identical (-55°C to 150°C TJ), supporting equivalent thermal performance across all application environments.
• The P6SMB540A maintains active product status with RoHS compliance, ensuring long-term availability and regulatory alignment.
• The P6SMB540A is available in higher inventory quantities (15,400 pcs) compared to the obsolete P6SMB540 (819 pcs), supporting production continuity.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB540A directly replace the P6SMB540 without circuit modification?

A: Yes. Both parts share identical reverse standoff voltage (460V), peak pulse current (800mA), power dissipation (600W), operating temperature range (-55°C to 150°C), and DO-214AA SMB package specifications. Direct substitution is supported at the circuit and PCB layout level.

Q: What is the significance of the clamping voltage difference (777V vs. 740V)?

A: The clamping voltage represents the maximum voltage across the TVS diode during transient suppression. The P6SMB540A clamping voltage of 740V is lower than the P6SMB540 at 777V. For general-purpose protection applications where the 460V reverse standoff voltage is the primary design constraint, this difference remains within acceptable operational tolerance. Circuit-specific validation is required if clamping voltage is a critical design parameter.

Q: Are there packaging differences between these parts?

A: Both parts use the DO-214AA (SMB) surface-mount package. The P6SMB540 is supplied in standard packaging, while the P6SMB540A is supplied in Tape & Reel (TR) format. This difference affects procurement and assembly processes but does not impact electrical performance or PCB compatibility.

Q: What compliance certifications apply to the P6SMB540A?

A: The P6SMB540A is RoHS Compliant with Moisture Sensitivity Level (MSL) 1 (Unlimited). It carries ECCN EAR99 and HTSUS 8541.10.0080 classifications, matching the regulatory profile of the original P6SMB540.

Q: Why is the P6SMB540 classified as obsolete?

A: Littelfuse Inc. has discontinued the P6SMB540. The P6SMB540A from Eaton - Electronics Division provides functional and electrical equivalence for ongoing design support and procurement requirements.