P6SMBJ440 Equivalent & Substitute Parts

Part Overview

The P6SMBJ440 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 376V reverse standoff voltage with a 632.1V maximum clamping voltage and 1A peak pulse current rating in a DO-214AA (SMB) package.

The P6SMBJ440 is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

P6SMBJ440

Littelfuse Inc.In Stock: 889P6SMBJ440 Datasheet

Current PartRFQ

P6SMB440A

Eaton - Electronics DivisionIn Stock: 20427P6SMB440A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMBJ440 is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage (Typ): 376V — The substitute must maintain this voltage rating to ensure proper circuit protection thresholds.
• Peak Pulse Current (10/1000µs): 1A — The substitute must support this current specification for transient suppression capability.
• Power - Peak Pulse: 600W — The substitute must dissipate equivalent peak pulse power.
• Clamping Voltage (Max) @ Ipp: The substitute clamping voltage must be within acceptable limits to prevent overvoltage damage to protected circuits.
• Package / Case: DO-214AA, SMB — The substitute must use the same surface-mount package for PCB compatibility.
• Unidirectional Channels: 1 — The substitute must maintain single-channel configuration.
• Operating Temperature Range: -55°C to 150°C — The substitute must support the same thermal operating window.

The P6SMB440A qualifies as a direct substitute based on these parameters.

Parameter Comparison

Engineering Selection Recommendations

The P6SMB440A is the manufacturer-recommended substitute for the obsolete P6SMBJ440. Both components share identical reverse standoff voltage (376V), peak pulse current (1A), peak pulse power (600W), operating temperature range (-55°C to 150°C), and package configuration (DO-214AA, SMB).

The P6SMB440A offers the advantage of active product status with current manufacturing availability (20,400 pcs in stock versus 856 pcs for the obsolete P6SMBJ440). The substitute exhibits a lower maximum clamping voltage (602V versus 632.1V), which provides improved transient suppression performance.

Design teams should note the RoHS compliance difference: the P6SMBJ440 is RoHS3 compliant, while the P6SMB440A is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulatory requirements. The P6SMB440A is classified as REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB440A directly replace the P6SMBJ440 in existing designs?

A: Yes. Both components maintain identical reverse standoff voltage (376V), peak pulse current (1A), power dissipation (600W), operating temperature range (-55°C to 150°C), and surface-mount package configuration (DO-214AA, SMB). The P6SMB440A clamping voltage (602V) is lower than the P6SMBJ440 (632.1V), which represents improved transient suppression performance.

Q: What is the significance of the different clamping voltages?

A: The P6SMB440A maximum clamping voltage of 602V is lower than the P6SMBJ440 at 632.1V. Lower clamping voltage indicates faster transient suppression and reduced overvoltage stress on protected circuit components. This is a functional improvement for transient protection applications.

Q: Are there packaging differences between these components?

A: Both components use the DO-214AA (SMB) surface-mount package. The P6SMBJ440 is supplied in standard packaging, while the P6SMB440A is supplied in Tape & Reel (TR) format. Both packages are compatible with standard PCB assembly processes.

Q: What compliance considerations apply to substitution?

A: The P6SMBJ440 is RoHS3 compliant, while the P6SMB440A is RoHS non-compliant. Applications subject to RoHS regulatory requirements must evaluate this compliance difference. The P6SMB440A is REACH Unaffected. Both components have MSL rating of 1 (Unlimited).

Q: Why is the P6SMBJ440 classified as obsolete?

A: The P6SMBJ440 is no longer in active production. The P6SMB440A represents the current active equivalent from the manufacturer's product line, with superior availability and active manufacturing support.