SMBJ45C Equivalent & Substitute Parts

Part Overview

The SMBJ45C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 45V reverse standoff voltage with a 76.34V maximum clamping voltage and 8.3A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ45C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

SMBJ45C

Littelfuse Inc.In Stock: 879SMBJ45C Datasheet

Current PartRFQ

SMBJ45CA

MDDIn Stock: 17275SMBJ45CA Datasheet

DirectRFQ

SMBJ45CA

MDDIn Stock: 17275SMBJ45CA Datasheet

DirectRFQ

SMBJ45CA-13-F

Diodes IncorporatedIn Stock: 66074SMBJ45CA-13-F Datasheet

MFR RecommendedRFQ

SMBJ45CA-TP

Micro Commercial CoIn Stock: 1172SMBJ45CA-TP Datasheet

MFR RecommendedRFQ

SMBJ45CE3/TR13

Microchip TechnologyIn Stock: 1221SMBJ45CE3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ45C are qualified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Voltage - Reverse Standoff (Typ): 45V
• Current - Peak Pulse (10/1000µs): 8.3A or compatible
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB (surface mount)
• Bidirectional Channels: 1
• Applications: General Purpose

Secondary Compatibility Factors:

• Voltage - Clamping (Max) @ Ipp: Within acceptable range for circuit protection
• Operating Temperature Range: Minimum -55°C to maximum 150°C
• RoHS3 Compliance and MSL rating

All substitute parts listed maintain the same reverse standoff voltage (45V) and peak pulse current (8.3A), ensuring direct functional replacement in 45V protection circuits. Variations in clamping voltage (72.7V to 80.3V) remain within acceptable tolerance for general-purpose TVS applications with identical standoff specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): SMBJ45CA-13-F (Diodes Incorporated) is the manufacturer-recommended substitute. This part maintains full electrical equivalence with 45V reverse standoff, 8.3A peak pulse current, and 600W power rating. The part is in active production status with extensive inventory availability (66,041 pcs), ensuring supply chain continuity. Operating temperature range of -55°C to 150°C covers standard industrial applications. ROHS3 compliance and MSL 1 rating match the original specification.

Alternative Substitutes (Active Production): SMBJ45CA (MDD) and SMBJ45CA-TP (Micro Commercial Co) provide equivalent electrical performance with identical 45V standoff and 8.3A current ratings. SMBJ45CA-TP offers extended operating temperature to 175°C, suitable for high-temperature environments. All three alternatives are in active production with ROHS3 compliance.

Secondary Option (Clamping Voltage Variation): SMBJ45CE3/TR13 (Microchip Technology) maintains 45V reverse standoff voltage but features 80.3V clamping voltage and 7.5A peak pulse current. This part is suitable for applications where slightly higher clamping voltage is acceptable and peak pulse current requirements do not exceed 7.5A. Active production status and ROHS3 compliance are confirmed.

All substitute parts are surface-mount DO-214AA (SMB) package compatible with the original SMBJ45C footprint and are ROHS3 compliant with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45CA-13-F directly replace SMBJ45C in existing designs? A: Yes. SMBJ45CA-13-F maintains identical reverse standoff voltage (45V), peak pulse current (8.3A), and power rating (600W). The DO-214AA (SMB) package is footprint-compatible. No circuit modifications are required.

Q: What is the difference between SMBJ45CA and SMBJ45CA-13-F? A: Both parts share identical electrical specifications (45V standoff, 8.3A peak pulse, 600W power). SMBJ45CA-13-F is supplied in Tape & Reel packaging by Diodes Incorporated, while SMBJ45CA (MDD version) may have different packaging or supplier configurations. Electrical performance is equivalent.

Q: Why does SMBJ45CE3/TR13 have different current and clamping specifications? A: SMBJ45CE3/TR13 is a variant within the 45V standoff family with 80.3V clamping voltage and 7.5A peak pulse current. It remains functionally equivalent for 45V protection circuits where peak pulse current does not exceed 7.5A and higher clamping voltage is acceptable.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (SMBJ45CA, SMBJ45CA-13-F, SMBJ45CA-TP, SMBJ45CE3/TR13) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ45C specification.

Q: Which substitute has the widest operating temperature range? A: SMBJ45CA-TP (Micro Commercial Co) offers the extended operating temperature range of -55°C to 175°C, compared to -55°C to 150°C for most alternatives. This makes it suitable for high-temperature applications.

Q: Is the DO-214AA package the same as SMB? A: Yes. DO-214AA and SMB refer to the same surface-mount package designation. All substitute parts use this identical package, ensuring direct footprint compatibility with SMBJ45C designs.