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SMBG40HE3/5B Equivalent & Substitute Parts
Part Overview
The SMBG40HE3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface-mount component is designed for transient overvoltage protection in automotive-grade applications. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 40V |
| Voltage - Breakdown (Min) | 44.4V |
| Voltage - Clamping (Max) @ Ipp | 71.4V |
| Current - Peak Pulse (10/1000µs) | 8.4A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Package / Case | DO-215AA, SMB Gull Wing |
| Mounting Type | Surface Mount |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SMBG40HE3/5B is determined by the following critical parameters:
- Reverse Standoff Voltage (40V): Defines the normal operating voltage threshold. Substitute parts must maintain this specification.
- Package Type (DO-215AA, SMB Gull Wing): Physical and electrical compatibility requires identical package geometry and pin configuration.
- Mounting Type (Surface Mount): Ensures compatibility with existing PCB layouts and assembly processes.
- Automotive Grade & AEC-Q101 Qualification: Maintains compliance with automotive reliability and qualification standards.
- Operating Temperature Range (-55°C to 150°C): Ensures thermal performance across the specified operating envelope.
The SMBG40AHE3/5B qualifies as a direct substitute based on matching all critical parameters while offering improved electrical performance characteristics within the same package and qualification framework.
Parameter Comparison
| Parameter | SMBG40HE3/5B (Main Part) | SMBG40AHE3/5B (Substitute) |
|---|---|---|
| Manufacturer | Vishay General Semiconductor - Diodes Division | Vishay General Semiconductor - Diodes Division |
| Series | TransZorb® | TransZorb® |
| Type | Zener | Zener |
| Unidirectional Channels | 1 | 1 |
| Voltage - Reverse Standoff (Typ) | 40V | 40V |
| Voltage - Breakdown (Min) | 44.4V | 44.4V |
| Voltage - Clamping (Max) @ Ipp | 71.4V | 64.5V |
| Current - Peak Pulse (10/1000µs) | 8.4A | 9.3A |
| Power - Peak Pulse | 600W | 600W |
| Operating Temperature | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) |
| Grade | Automotive | Automotive |
| Qualification | AEC-Q101 | AEC-Q101 |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | DO-215AA, SMB Gull Wing | DO-215AA, SMB Gull Wing |
| Supplier Device Package | SMBG (DO-215AA) | SMBG (DO-215AA) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The SMBG40AHE3/5B is the qualified substitute for the obsolete SMBG40HE3/5B. Both components maintain identical automotive-grade specifications and AEC-Q101 qualification, ensuring compliance with automotive reliability requirements. The substitute part is currently in active production status, providing long-term availability and supply chain continuity.
The SMBG40AHE3/5B demonstrates improved peak pulse current capability (9.3A versus 8.4A) and lower clamping voltage (64.5V versus 71.4V), both favorable characteristics for transient suppression performance. These enhancements occur within the same power dissipation envelope (600W peak pulse) and identical package geometry, confirming direct functional compatibility.
Selection of the SMBG40AHE3/5B eliminates obsolescence risk while maintaining full compliance with automotive qualification standards and environmental regulations (ROHS3, REACH).
Frequently Asked Questions (FAQ)
Q: Can the SMBG40AHE3/5B be used as a direct replacement for the SMBG40HE3/5B in existing designs?
A: Yes. Both parts share identical reverse standoff voltage (40V), breakdown voltage (44.4V), operating temperature range (-55°C to 150°C), package type (DO-215AA SMB), and automotive-grade AEC-Q101 qualification. The substitute part is electrically and mechanically compatible with existing PCB layouts and assembly processes.
Q: What are the key differences between these two parts?
A: The primary differences are product status and electrical performance. The SMBG40HE3/5B is obsolete, while the SMBG40AHE3/5B is active. The substitute offers improved peak pulse current (9.3A versus 8.4A) and lower clamping voltage (64.5V versus 71.4V), both beneficial for transient protection.
Q: Are there packaging differences between these parts?
A: No. Both components use identical DO-215AA (SMB Gull Wing) surface-mount packaging. The SMBG40AHE3/5B is supplied in Tape & Reel format, which is standard for high-volume production and assembly automation.
Q: Do both parts meet automotive qualification requirements?
A: Yes. Both the SMBG40HE3/5B and SMBG40AHE3/5B carry automotive-grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.
Q: What is the moisture sensitivity level for these components?
A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or assembly processes.
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