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SMBJ33AHM3_A/I Equivalent & Substitute Parts
Part Overview
The SMBJ33AHM3_A/I 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 telecom applications requiring transient voltage protection. The device features a 33V reverse standoff voltage with a 53.3V maximum clamping voltage and 11.3A peak pulse current capability in a DO-214AA (SMB) package.
The SMBJ33AHM3_A/I is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 33V |
| Voltage - Breakdown (Min) | 36.7V |
| Voltage - Clamping (Max) @ Ipp | 53.3V |
| Current - Peak Pulse (10/1000µs) | 11.3A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Package / Case | DO-214AA (SMB) |
| Mounting Type | Surface Mount |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the SMBJ33AHM3_A/I is determined by strict equivalence across the following critical parameters:
- Voltage - Reverse Standoff: 33V (±tolerance)
- Voltage - Breakdown (Min): 36.7V
- Voltage - Clamping (Max) @ Ipp: 53.3V
- Current - Peak Pulse (10/1000µs): 11.3A
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA (SMB)
- Unidirectional configuration (1 channel)
- Operating Temperature Range: -55°C to 150°C (TJ)
- Automotive Grade with AEC-Q101 qualification
- RoHS3 Compliance
The SMBJ33AHM3_B/I meets all these criteria and is identified as the manufacturer-recommended substitute. The primary distinction is product status: the original part is obsolete, while the substitute is active in production.
Parameter Comparison
| Parameter | SMBJ33AHM3_A/I | SMBJ33AHM3_B/I |
|---|---|---|
| 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) | 33V | 33V |
| Voltage - Breakdown (Min) | 36.7V | 36.7V |
| Voltage - Clamping (Max) @ Ipp | 53.3V | 53.3V |
| Current - Peak Pulse (10/1000µs) | 11.3A | 11.3A |
| 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 |
| Package / Case | DO-214AA (SMB) | DO-214AA (SMB) |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The SMBJ33AHM3_B/I is the direct substitute for the SMBJ33AHM3_A/I. Both components are manufactured by Vishay and maintain identical electrical and mechanical specifications. The substitute part carries active product status, ensuring ongoing availability and manufacturing support.
Both parts meet automotive-grade requirements with AEC-Q101 qualification and maintain ROHS3 compliance. The packaging format (DO-214AA SMB) and mounting type (surface mount) are identical, enabling direct PCB-level replacement without design modification.
Selection of the SMBJ33AHM3_B/I is appropriate for new designs, production continuity, and field replacement applications where the original obsolete part is no longer available.
Frequently Asked Questions (FAQ)
Q: Can the SMBJ33AHM3_B/I be used as a direct replacement for the SMBJ33AHM3_A/I?
A: Yes. The SMBJ33AHM3_B/I is electrically and mechanically identical to the SMBJ33AHM3_A/I across all specified parameters. Both components feature identical voltage ratings (33V standoff, 53.3V clamping), current handling (11.3A peak pulse), power dissipation (600W), operating temperature range (-55°C to 150°C), and package format (DO-214AA SMB). Direct substitution is supported without circuit modification.
Q: What is the primary difference between these two part numbers?
A: The SMBJ33AHM3_A/I is classified as obsolete, while the SMBJ33AHM3_B/I is active in production. The packaging differs: the original uses standard packaging, while the substitute is supplied in Tape & Reel (TR) format. Electrical performance and specifications remain identical.
Q: Are both parts automotive-qualified?
A: Yes. Both the SMBJ33AHM3_A/I and SMBJ33AHM3_B/I carry automotive-grade classification with AEC-Q101 qualification, meeting automotive industry reliability and quality standards.
Q: Is the DO-214AA (SMB) package compatible with existing PCB designs?
A: Yes. Both parts use the identical DO-214AA (SMB) surface mount package. PCB footprints, solder pad layouts, and mounting procedures remain unchanged, enabling direct component substitution without PCB redesign.
Q: Do both parts comply with RoHS requirements?
A: Yes. Both the SMBJ33AHM3_A/I and SMBJ33AHM3_B/I are ROHS3 compliant, meeting current environmental and material restriction standards.
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