SMBJ250C Equivalent & Substitute Parts

Part Overview

The SMBJ250C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 250V reverse standoff voltage with a 405V maximum clamping voltage and 1.5A peak pulse current rating in a surface mount DO-214AA (SMB) package. The SMBJ250C is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure ongoing component availability for new production and field replacements.

Substiute Parts

SMBJ250C

Littelfuse Inc.In Stock: 998SMBJ250C Datasheet

Current PartRFQ

SMBJ250CA

SMC Diode SolutionsIn Stock: 24348SMBJ250CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ250C is determined by electrical and mechanical parameter equivalence. The substitute part must satisfy the following criteria:

Electrical Parameters (Critical for Substitution):

• Voltage - Reverse Standoff (Typ): 250V
• Voltage - Breakdown (Min): 279V
• Voltage - Clamping (Max) @ Ipp: 405V
• Current - Peak Pulse (10/1000µs): 1.5A
• Power - Peak Pulse: 600W
• Type: Zener
• Bidirectional Channels: 1

Mechanical Parameters (Critical for Substitution):

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount

The SMBJ250CA from SMC Diode Solutions meets all electrical and mechanical substitution criteria, maintaining identical voltage ratings, current specifications, and package configuration while offering active product status and improved availability.

Parameter Comparison

*The SMBJ250CA operates from -55°C to 150°C, which does not extend to the -65°C minimum of the SMBJ250C. Applications requiring operation below -55°C require design review.

Engineering Selection Recommendations

The SMBJ250CA is the direct electrical and mechanical equivalent to the SMBJ250C. Selection of the SMBJ250CA is supported by the following factors:

Product Status: The SMBJ250CA maintains active product status with 24,300 units in stock, ensuring long-term availability compared to the obsolete SMBJ250C.

Compliance: Both parts are RoHS compliant. The SMBJ250CA carries ROHS3 compliance certification and is REACH Affected, meeting current regulatory requirements for electronic components.

Electrical Equivalence: All critical electrical parameters—reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power—are identical between the two parts.

Mechanical Compatibility: Both parts use the DO-214AA (SMB) surface mount package, ensuring PCB footprint and assembly process compatibility.

Temperature Range Consideration: The SMBJ250CA minimum operating temperature is -55°C versus -65°C for the SMBJ250C. Applications operating below -55°C require thermal analysis to confirm suitability.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ250CA directly replace the SMBJ250C on existing PCBs?

A: Yes. The SMBJ250CA is mechanically and electrically equivalent to the SMBJ250C. Both components use the DO-214AA (SMB) surface mount package with identical footprints and pinouts. No PCB redesign is required.

Q: What is the difference between the SMBJ250C and SMBJ250CA?

A: The primary differences are manufacturer (Littelfuse vs. SMC Diode Solutions), product status (Obsolete vs. Active), and minimum operating temperature (-65°C vs. -55°C). All electrical specifications and package configurations are identical.

Q: Does the SMBJ250CA meet the same compliance standards as the SMBJ250C?

A: Both parts are RoHS compliant. The SMBJ250CA carries ROHS3 certification and is REACH Affected, meeting current regulatory standards. The SMBJ250C is RoHS Compliant without ROHS3 designation.

Q: Is the SMBJ250CA suitable for telecom applications?

A: The SMBJ250CA is rated for general purpose applications and meets all electrical requirements for telecom transient voltage suppression. The electrical specifications are identical to the SMBJ250C, which was specified for telecom use.

Q: What is the packaging difference between the SMBJ250C and SMBJ250CA?

A: The SMBJ250C is supplied in standard packaging, while the SMBJ250CA is supplied in Tape & Reel (TR) format. Both use the DO-214AA (SMB) package. Tape & Reel packaging is standard for high-volume surface mount assembly.

Q: Are there any temperature-related limitations when substituting the SMBJ250CA for the SMBJ250C?

A: The SMBJ250CA operates from -55°C to 150°C, while the SMBJ250C operates from -65°C to 150°C. Applications requiring operation below -55°C must be evaluated for thermal performance with the SMBJ250CA.

Q: What is the inventory status of these parts?

A: The SMBJ250C (obsolete) has 945 units in stock. The SMBJ250CA (active) has 24,300 units in stock, providing significantly greater availability for current and future production requirements.