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SMBJ45CA-M3/52 Equivalent & Substitute Parts
Part Overview
The SMBJ45CA-M3/52 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 45V reverse standoff category with a 72.7V maximum clamping voltage and 8.3A peak pulse current rating. The device is classified as Active product status and is designed for general purpose transient voltage suppression applications. Equivalent and substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and manufacturing specifications to ensure direct circuit board replacement capability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 45 | V |
| Voltage - Breakdown (Min) | 50 | V |
| Voltage - Clamping (Max) @ Ipp | 72.7 | V |
| Current - Peak Pulse (10/1000µs) | 8.3 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ45CA-M3/52 are grouped into two categories based on electrical parameter alignment:
Category 1: Direct Electrical Equivalents Parts that maintain identical or near-identical electrical specifications across all critical parameters: Voltage - Reverse Standoff (45V), Voltage - Breakdown (50V minimum), Voltage - Clamping (72.7V maximum), and Current - Peak Pulse (8.3A). These parts are mechanically compatible in DO-214AA/SMB package format and support direct circuit board substitution without design modification.
Category 2: Voltage-Variant Alternatives Parts that operate within the same product family but with different reverse standoff voltage ratings (40V, 43V, or 48V). These alternatives are suitable only when circuit design permits voltage parameter variation and the application tolerance allows deviation from the original 45V specification.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package |
|---|---|---|---|---|---|---|---|---|
| SMBJ45CA-M3/52 | Vishay | 45 | 50 | 72.7 | 8.3 | 600 | -55 to 150 | DO-214AA |
| SMBJ45CD-M3/H | Vishay | 45 | 50.8 | 71.6 | 8.4 | 600 | -55 to 150 | DO-214AA |
| SMBJ45CA-E3/52 | Vishay | 45 | 50 | 72.7 | 8.3 | 600 | -55 to 150 | DO-214AA |
| SMBJ45CA | MDD | 45 | 50 | 72.7 | 8.3 | 600 | -50 to 150 | DO-214AA |
| SMBJ45CA-13-F | Diodes Incorporated | 45 | 50 | 72.7 | 8.3 | 600 | -55 to 150 | DO-214AA |
| SMBJ40CA | MDD | 40 | 44.4 | 64.5 | 9.3 | 600 | -50 to 150 | DO-214AA |
| SMBJ43CA | MDD | 43 | 47.8 | 69.4 | 8.7 | 600 | -50 to 150 | DO-214AA |
| SMBJ48CA | MDD | 48 | 53.3 | 77.4 | 7.8 | 600 | -50 to 150 | DO-214AA |
Engineering Selection Recommendations
Primary Substitutes (Direct Equivalents)
SMBJ45CA-E3/52 (Vishay) and SMBJ45CA-13-F (Diodes Incorporated) are direct electrical equivalents with identical reverse standoff voltage (45V), breakdown voltage (50V minimum), clamping voltage (72.7V), and peak pulse current (8.3A) specifications. Both maintain ROHS3 compliance and MSL 1 rating. SMBJ45CA-E3/52 offers higher inventory availability (45,400 units) and is manufacturer-recommended. SMBJ45CA-13-F provides an alternative source from Diodes Incorporated with equivalent electrical performance and -55°C to 150°C operating range.
SMBJ45CD-M3/H (Vishay) operates at 45V reverse standoff with marginally different clamping characteristics (71.6V versus 72.7V) and slightly elevated peak pulse current (8.4A versus 8.3A). This part maintains full ROHS3 and MSL 1 compliance and is suitable for applications where ±1.1V clamping voltage variation is acceptable.
SMBJ45CA (MDD) provides electrical equivalence with identical 45V standoff, 50V breakdown, 72.7V clamping, and 8.3A peak pulse specifications. Operating temperature range is -50°C to 150°C, which is 5°C narrower at the lower bound compared to the original part.
Voltage-Variant Alternatives
SMBJ43CA (MDD) operates at 43V reverse standoff with 69.4V clamping voltage and 8.7A peak pulse current. This part is suitable only when circuit design permits 2V reduction in standoff voltage and 3.3V reduction in clamping voltage.
SMBJ48CA (MDD) operates at 48V reverse standoff with 77.4V clamping voltage and 7.8A peak pulse current. This part is suitable only when circuit design permits 3V increase in standoff voltage and 4.7V increase in clamping voltage.
SMBJ40CA (MDD) operates at 40V reverse standoff with 64.5V clamping voltage and 9.3A peak pulse current. This part is suitable only when circuit design permits 5V reduction in standoff voltage and 8.2V reduction in clamping voltage.
All substitute parts maintain 600W peak pulse power rating, ROHS3 compliance, and MSL 1 moisture sensitivity classification.
Frequently Asked Questions (FAQ)
Q: Can SMBJ45CA-E3/52 be used as a direct replacement for SMBJ45CA-M3/52?
A: Yes. Both parts share identical electrical specifications: 45V reverse standoff, 50V minimum breakdown voltage, 72.7V maximum clamping voltage, and 8.3A peak pulse current. Both are manufactured by Vishay, packaged in DO-214AA format, and maintain ROHS3 compliance and MSL 1 rating. The parts are electrically and mechanically interchangeable.
Q: What is the difference between SMBJ45CA-M3/52 and SMBJ45CD-M3/H?
A: Both parts operate at 45V reverse standoff voltage. SMBJ45CD-M3/H exhibits a clamping voltage of 71.6V (versus 72.7V) and peak pulse current of 8.4A (versus 8.3A). The 1.1V clamping voltage difference and 0.1A current difference are within typical device variation. Both maintain identical operating temperature range (-55°C to 150°C) and compliance certifications.
Q: Can SMBJ40CA, SMBJ43CA, or SMBJ48CA be used instead of SMBJ45CA-M3/52?
A: These parts operate at different reverse standoff voltages (40V, 43V, and 48V respectively) and exhibit different clamping voltages and peak pulse currents. Substitution is permissible only if circuit design specifications explicitly allow voltage parameter variation. Direct substitution without design review is not recommended.
Q: What is the operating temperature difference between SMBJ45CA-M3/52 and SMBJ45CA (MDD)?
A: SMBJ45CA-M3/52 operates from -55°C to 150°C. SMBJ45CA (MDD) operates from -50°C to 150°C. The MDD variant has a 5°C narrower lower temperature limit. For applications requiring operation below -50°C, the original Vishay part or SMBJ45CA-E3/52 is required.
Q: Are all substitute parts available in the same DO-214AA/SMB package?
A: Yes. All listed substitute parts are packaged in DO-214AA (SMB) format and are compatible with surface mount assembly processes designed for the original SMBJ45CA-M3/52.
Q: What compliance certifications apply to all substitute parts?
A: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level classification. All parts are classified as Active product status with no known end-of-life announcements.
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