SMBJ45 Equivalent & Substitute Parts

Part Overview

The SMBJ45 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 45V reverse standoff voltage with a 76.34V maximum clamping voltage at peak pulse current of 8.3A, packaged in the DO-214AA (SMB) form factor. The SMBJ45 is classified as obsolete; equivalent and substitute parts with active product status are available to maintain design continuity and ensure supply chain reliability.

Substiute Parts

SMBJ45

Littelfuse Inc.In Stock: 834SMBJ45 Datasheet

Current PartRFQ

SMBJ45A

MDDIn Stock: 46008SMBJ45A Datasheet

MFR RecommendedRFQ

SMBJ45A

MDDIn Stock: 46008SMBJ45A Datasheet

MFR RecommendedRFQ

SMBJ45A-13-F

Diodes IncorporatedIn Stock: 8608SMBJ45A-13-F Datasheet

MFR RecommendedRFQ

SMBJ45A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 773SMBJ45A-E3/5B Datasheet

MFR RecommendedRFQ

SMBJ45A-M3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 889SMBJ45A-M3/52 Datasheet

MFR RecommendedRFQ

SMBJ45A-M3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 826SMBJ45A-M3/5B Datasheet

MFR RecommendedRFQ

TV06B450J-HF

Comchip TechnologyIn Stock: 974TV06B450J-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ45 is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Clamping (Max) @ Ipp: 72.7V to 76.34V range
• Current - Peak Pulse (10/1000µs): 8.25A to 8.3A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain electrical compatibility within the specified parameter tolerances and are housed in the same DO-214AA (SMB) surface-mount package. Substitute parts with active product status provide improved supply availability compared to the obsolete SMBJ45.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain functional equivalence to the SMBJ45 within the specified electrical and mechanical parameters. Selection among substitute parts should be based on the following criteria:

Product Status: All substitute parts carry active product status, ensuring ongoing availability and manufacturing support. The SMBJ45 is obsolete and should be replaced in new designs.

Compliance & Certifications: All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ45 specifications.

Manufacturer Options: Multiple manufacturers provide equivalent parts, including MDD, Diodes Incorporated, Vishay General Semiconductor - Diodes Division, and Comchip Technology. Selection may be based on supply chain preference, lead time, or existing qualification requirements.

Temperature Range Consideration: The SMBJ45 operates from -65°C to 150°C. Substitute parts from Diodes Incorporated and Vishay operate from -55°C to 150°C, which covers most industrial and commercial applications. The MDD variant operates from -50°C to 150°C. Applications requiring operation below -55°C should verify thermal performance requirements.

Packaging Variants: Vishay parts are available in Tape & Reel (TR) packaging, while MDD and Diodes Incorporated variants offer standard packaging options. Comchip Technology TV06B450J-HF is supplied in Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A substitute for the obsolete SMBJ45?

A: Yes. SMBJ45A from MDD maintains the same 45V reverse standoff voltage, 8.3A peak pulse current, and 600W peak pulse power rating. The clamping voltage is 72.7V compared to the original 76.34V, which remains within acceptable overvoltage protection parameters for general-purpose applications. Both are housed in DO-214AA (SMB) surface-mount packages.

Q: What is the difference between SMBJ45A variants from different manufacturers?

A: All SMBJ45A variants (MDD, Diodes Incorporated, Vishay) maintain identical electrical specifications: 45V reverse standoff, 50V minimum breakdown, 72.7V maximum clamping voltage, and 8.3A peak pulse current. Differences exist in operating temperature ranges, packaging options (Tape & Reel vs. standard), and manufacturer-specific part number suffixes. Selection should be based on supply availability and existing design qualifications.

Q: Is TV06B450J-HF from Comchip Technology a direct substitute?

A: TV06B450J-HF is functionally equivalent with one minor difference: peak pulse current is specified as 8.25A compared to 8.3A in other substitutes. This 0.05A difference is negligible for general-purpose overvoltage protection applications. The part maintains 45V reverse standoff, 72.7V clamping voltage, and 600W peak pulse power. Operating temperature range is not specified in available documentation.

Q: Can I use these substitutes in designs originally specified for SMBJ45?

A: Yes, provided the application does not require operation below -55°C. All substitute parts are ROHS3 compliant, carry MSL 1 rating, and are packaged in DO-214AA (SMB) form factor. The electrical parameters fall within acceptable tolerance ranges for transient voltage suppression in general-purpose circuits. Verify that the slightly lower clamping voltage (72.7V vs. 76.34V) meets your specific overvoltage protection threshold requirements.

Q: What packaging options are available for these substitutes?

A: MDD SMBJ45A is available in standard packaging. Diodes Incorporated SMBJ45A-13-F and Vishay variants (SMBJ45A-E3/5B, SMBJ45A-M3/52, SMBJ45A-M3/5B) are supplied in Tape & Reel (TR) format. Comchip Technology TV06B450J-HF is also supplied in Tape & Reel. Tape & Reel packaging is standard for high-volume surface-mount assembly operations.