P6SMB440C Equivalent & Substitute Parts

Part Overview

The P6SMB440C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component operates with a reverse standoff voltage of 376V and provides clamping at 632.1V with a peak pulse power rating of 600W. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	376V
Breakdown Voltage (Min)	396V
Clamping Voltage (Max) @ Ipp	632.1V
Peak Pulse Current (10/1000µs)	1A
Peak Pulse Power	600W
Operating Temperature Range	-55°C to 150°C (TJ)
Package Type	DO-214AA (SMB)
Bidirectional Channels	1
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the P6SMB440C is determined by strict alignment of the following electrical and mechanical parameters:

Reverse Standoff Voltage: 376V (typical)
Peak Pulse Current: 1A
Peak Pulse Power: 600W
Package: DO-214AA (SMB) surface mount
Bidirectional configuration with single channel
Operating temperature range compatibility

All substitute parts listed maintain these core specifications, ensuring functional equivalence in transient voltage suppression applications. Clamping voltage variations within the specified range (602V to 632.1V) remain within acceptable operational limits for this device category.

Parameter Comparison

Parameter	P6SMB440C (Littelfuse)	P6SMB440CA (Eaton)	SMBJ376CA (Bourns)	SMBJP6KE440CA-TP (Micro Commercial)
Reverse Standoff Voltage (Typ)	376V	376V	376V	376V
Breakdown Voltage (Min)	396V	418V	418V	418V
Clamping Voltage (Max) @ Ipp	632.1V	602V	602V	602V
Peak Pulse Current (10/1000µs)	1A	1A	1A	1A
Peak Pulse Power	600W	600W	600W	600W
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

P6SMB440CA (Eaton - Electronics Division): This part maintains identical electrical specifications to the original P6SMB440C and carries active product status with RoHS compliance. It is available in high volume (740,100 pcs) with Cut Tape and Digi-Reel packaging options, making it suitable for both prototype and production environments.

SMBJ376CA (Bourns Inc.): This manufacturer-recommended substitute provides equivalent electrical performance with active product status and ROHS3 compliance. Availability is moderate (902 pcs), and it is supplied in Tape & Reel packaging. This option is appropriate for applications requiring established Bourns supply chain support.

SMBJP6KE440CA-TP (Micro Commercial Co): This manufacturer-recommended substitute offers the widest operating temperature range (-55°C to 175°C) among all substitutes, extending beyond the original specification. It maintains all core electrical parameters and carries ROHS3 compliance with the highest inventory availability (3,820 pcs). This option is optimal for applications requiring extended temperature performance or maximum supply security.

All three substitutes are electrically and mechanically compatible with the P6SMB440C in DO-214AA (SMB) surface-mount applications.

Frequently Asked Questions (FAQ)

Q: Can P6SMB440CA be used as a direct replacement for P6SMB440C?

A: Yes. The P6SMB440CA maintains identical reverse standoff voltage (376V), peak pulse current (1A), and peak pulse power (600W) specifications. Both use the DO-214AA (SMB) package. The primary difference is product status: P6SMB440C is obsolete while P6SMB440CA is active.

Q: What is the difference between the clamping voltages listed for these parts?

A: The original P6SMB440C specifies a maximum clamping voltage of 632.1V, while the substitute parts specify 602V. Both values fall within acceptable operational ranges for transient voltage suppression. The lower clamping voltage in substitutes provides equivalent or improved protection characteristics.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility. Packaging formats differ (Cut Tape, Digi-Reel, or Tape & Reel), but the component package itself is identical.

Q: Which substitute offers the best temperature performance?

A: The SMBJP6KE440CA-TP extends the operating temperature range to -55°C to 175°C, compared to -55°C to 150°C for the original and other substitutes. This provides an additional 25°C of high-temperature operation capability.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts carry RoHS compliance certifications (either RoHS or ROHS3), meeting environmental and regulatory requirements equivalent to or exceeding the original P6SMB440C specification.

Q: What is the inventory status for each substitute?

A: P6SMB440CA (Eaton) has 740,100 pcs available; SMBJ376CA (Bourns) has 902 pcs; SMBJP6KE440CA-TP (Micro Commercial) has 3,820 pcs. All are classified as new original stock.

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