SMBJ45CA-TP Equivalent & Substitute Parts

Part Overview

The SMBJ45CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode operates with a 45V reverse standoff voltage and provides 72.7V maximum clamping voltage at peak pulse current of 8.3A. The component is housed in a DO-214AA (SMB) package and is currently in active production status with RoHS3 compliance.

Equivalent and substitute parts are identified based on matching electrical performance parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and power dissipation capability. Mechanical compatibility is ensured through identical or functionally equivalent packaging specifications.

Substiute Parts

SMBJ45CA-TP

Micro Commercial CoIn Stock: 1172SMBJ45CA-TP Datasheet

Current PartRFQ

SMBJ45CA

MDDIn Stock: 17275SMBJ45CA Datasheet

DirectRFQ

SMBJ45CA

MDDIn Stock: 17275SMBJ45CA Datasheet

DirectRFQ

SMBJ45CA

MDDIn Stock: 17275SMBJ45CA Datasheet

DirectRFQ

SMBJ45CA-13-F

Diodes IncorporatedIn Stock: 66074SMBJ45CA-13-F Datasheet

DirectRFQ

SMBJ45CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 45502SMBJ45CA-E3/52 Datasheet

DirectRFQ

SZ1SMB45CAT3G

Littelfuse Inc.In Stock: 5703SZ1SMB45CAT3G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ45CA-TP are classified into two categories based on electrical and mechanical parameter alignment:

Direct Equivalents match all critical electrical parameters: 45V reverse standoff voltage, 50V minimum breakdown voltage, 72.7V maximum clamping voltage, 8.3A peak pulse current, and 600W peak pulse power. These parts are functionally interchangeable in the same circuit application and use identical DO-214AA (SMB) surface-mount packaging.

Similar Equivalents maintain the same reverse standoff voltage (45V), breakdown voltage (50V), peak pulse current (8.3A), and power dissipation (600W), with minor variations in clamping voltage (72.2V versus 72.7V) within acceptable engineering tolerance. These parts are mechanically compatible and electrically suitable for the same application class.

Substitution eligibility is determined by:

• Reverse Standoff Voltage: 45V (required)
• Breakdown Voltage: 50V minimum (required)
• Peak Pulse Current: 8.3A (required)
• Clamping Voltage: 72.2V to 72.7V (acceptable range)
• Package Type: DO-214AA / SMB (required)
• Bidirectional Channels: 1 (required)

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and RoHS3 compliance, meeting regulatory requirements for current applications. Selection among direct equivalents (SMBJ45CA, SMBJ45CA-13-F, SMBJ45CA-E3/52) is based on manufacturer availability and supply chain considerations, as electrical performance is identical.

The Littelfuse SZ1SMB45CAT3G variant offers extended lower operating temperature range (-65°C versus -55°C) and carries AEC-Q101 automotive qualification. The clamping voltage specification of 72.2V remains within acceptable tolerance relative to the 72.7V nominal value. This part is suitable for applications requiring automotive-grade reliability or extended low-temperature operation.

The MDD SMBJ45CA variant operates within a narrower temperature range (-50°C to 150°C) compared to the original specification (-55°C to 175°C). Verification of application temperature requirements is necessary before selection.

All substitute parts are packaged in DO-214AA (SMB) surface-mount format, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45CA-13-F replace SMBJ45CA-TP directly?

A: Yes. Both parts share identical electrical specifications: 45V reverse standoff voltage, 50V breakdown voltage, 72.7V clamping voltage, 8.3A peak pulse current, and 600W power dissipation. Both use DO-214AA (SMB) packaging. The primary difference is the operating temperature range: SMBJ45CA-13-F operates from -55°C to 150°C, while SMBJ45CA-TP operates from -55°C to 175°C. Confirm application temperature requirements before substitution.

Q: What is the difference between SMBJ45CA-E3/52 and SMBJ45CA-TP?

A: Electrical performance is identical across all critical parameters. SMBJ45CA-E3/52 is manufactured by Vishay and operates within -55°C to 150°C temperature range, compared to SMBJ45CA-TP's -55°C to 175°C range. Both are RoHS3 compliant and use identical DO-214AA (SMB) packaging.

Q: Is SZ1SMB45CAT3G compatible with SMBJ45CA-TP?

A: SZ1SMB45CAT3G is electrically compatible for the same application class. The clamping voltage is specified as 72.2V versus 72.7V on the original part—a 0.5V difference within acceptable engineering tolerance. The part operates across -65°C to 150°C and carries AEC-Q101 automotive qualification. Mechanical compatibility is confirmed through identical DO-214AA (SMB) packaging. Use this variant when automotive-grade reliability or extended low-temperature performance is required.

Q: Why does MDD SMBJ45CA have a narrower operating temperature range?

A: The MDD variant operates from -50°C to 150°C, compared to SMBJ45CA-TP's -55°C to 175°C specification. This represents a design or manufacturing difference between suppliers. Verify that your application does not require operation below -50°C or above 150°C before selecting this substitute.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, meeting current regulatory requirements for lead-free and restricted substance compliance.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes, all substitute parts use identical DO-214AA (SMB) surface-mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts and reflow assembly processes. No design modifications are required.