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SMBJ33C-E3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ33C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 33V reverse standoff voltage and provides 59V maximum clamping voltage at peak pulse current. The SMBJ33C-E3/5B is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ33C-E3/5B |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Bidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 33V |
| Voltage - Breakdown (Min) | 36.7V |
| Voltage - Clamping (Max) @ Ipp | 59V |
| Current - Peak Pulse (10/1000µs) | 10.2A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the SMBJ33C-E3/5B is determined by the following critical electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 33V
- Voltage - Breakdown (Min): 36.7V
- Package / Case: DO-214AA, SMB (surface mount)
- Type: Zener, Bidirectional (1 channel)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Substitute parts are grouped into two categories based on clamping voltage performance:
Category A - Direct Electrical Match (59V Clamping): Parts with identical clamping voltage specifications (59V @ Ipp), matching the original SMBJ33C-E3/5B performance envelope.
Category B - Improved Performance (53.3V Clamping): Parts with lower clamping voltage (53.3V @ Ipp) and higher peak pulse current (11.3A), offering enhanced transient suppression capability while maintaining the same reverse standoff and breakdown voltage specifications.
All substitute parts maintain DO-214AA/SMB package compatibility, surface-mount configuration, ROHS3 compliance, and MSL 1 rating.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ33C-E3/5B | Vishay General Semiconductor - Diodes Division | Obsolete | 33V | 36.7V | 59V | 10.2A | 600W | -55°C ~ 150°C | DO-214AA, SMB |
| SMBJ33CA-E3/5B | Vishay General Semiconductor - Diodes Division | Active | 33V | 36.7V | 53.3V | 11.3A | 600W | -55°C ~ 150°C | DO-214AA, SMB |
| SMBJ33CE3/TR13 | Microchip Technology | Active | 33V | 36.7V | 59V | 10.2A | 600W | -65°C ~ 150°C | DO-214AA, SMB |
| SMBJ33CA-HRA | Littelfuse Inc. | Active | 33V | 36.7V | 53.3V | 11.3A | 600W | -65°C ~ 150°C | DO-214AA, SMB |
| 1SMB33CA TR13 PBFREE | Central Semiconductor Corp | Active | 33V | 36.7V | 53.3V | 11.3A | 600W | -65°C ~ 150°C | DO-214AA, SMB |
| SMBJ33CA | MDD | Active | 33V | 36.7V | 53.3V | 11.3A | 600W | -50°C ~ 150°C | DO-214AA, SMB |
| SMBJ33CA-13-F | Diodes Incorporated | Active | 33V | 36.7V | 53.3V | 11.3A | 600W | -55°C ~ 150°C | DO-214AA, SMB |
| SMBJ33CA-TP | Micro Commercial Co | Active | 33V | 36.7V | 53.3V | 11.3A | 600W | -55°C ~ 175°C | DO-214AA, SMB |
Engineering Selection Recommendations
Direct Replacement (Electrical & Thermal Match):
SMBJ33CE3/TR13 (Microchip Technology) provides the closest functional equivalent to the obsolete SMBJ33C-E3/5B, maintaining identical clamping voltage (59V), peak pulse current (10.2A), and power dissipation (600W). This part is active, ROHS3 compliant, and extends the operating temperature range to -65°C, providing enhanced low-temperature performance. Microchip Technology's active product status ensures long-term availability and supply chain stability.
Performance-Enhanced Alternatives (Improved Transient Suppression):
SMBJ33CA-E3/5B (Vishay General Semiconductor - Diodes Division) offers improved performance with reduced clamping voltage (53.3V) and increased peak pulse current (11.3A) while maintaining the original manufacturer's product line. This part is active and maintains identical temperature range specifications (-55°C ~ 150°C).
SMBJ33CA-TP (Micro Commercial Co) provides the widest operating temperature range (-55°C ~ 175°C) among active substitutes, supporting applications requiring extended high-temperature operation. This part maintains 53.3V clamping voltage and 11.3A peak pulse current specifications.
SMBJ33CA-13-F (Diodes Incorporated) offers high inventory availability (35,300 pcs) with active product status, 53.3V clamping voltage, and 11.3A peak pulse current. Operating temperature range is -55°C ~ 150°C, matching the original part's thermal envelope.
All recommended substitutes maintain DO-214AA/SMB package compatibility, ROHS3 compliance, and MSL 1 rating, ensuring direct PCB compatibility without design modification.
Frequently Asked Questions (FAQ)
Q: Can SMBJ33CA-E3/5B replace SMBJ33C-E3/5B directly?
A: Yes. Both parts share identical reverse standoff voltage (33V), breakdown voltage (36.7V), package (DO-214AA/SMB), and operating temperature range (-55°C ~ 150°C). The SMBJ33CA-E3/5B features improved performance with lower clamping voltage (53.3V vs 59V) and higher peak pulse current (11.3A vs 10.2A), providing enhanced transient suppression. The part is active and manufactured by the same company.
Q: What is the difference between 59V and 53.3V clamping voltage?
A: Clamping voltage is the maximum voltage across the TVS diode during transient suppression at peak pulse current. Lower clamping voltage (53.3V) provides better protection by limiting voltage rise to a lower level, while 59V clamping allows slightly higher voltage transients. Both values are within the same protection class for 33V standoff applications. Selection depends on circuit tolerance requirements.
Q: Are all substitute parts in the same package?
A: Yes. All listed substitutes use DO-214AA/SMB surface-mount package, ensuring mechanical and electrical compatibility with the original SMBJ33C-E3/5B footprint. No PCB redesign is required.
Q: Which substitute offers the best temperature performance?
A: SMBJ33CA-TP (Micro Commercial Co) supports the widest operating temperature range (-55°C ~ 175°C), extending 25°C above the original part's maximum rating. This is beneficial for applications in high-temperature environments. Other substitutes maintain the original -55°C ~ 150°C range or extend to -65°C minimum.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory specifications.
Q: What is the inventory status of these substitutes?
A: All substitute parts are active products with confirmed inventory availability. SMBJ33CA (MDD) offers the highest inventory (25,840 pcs), while SMBJ33CA-13-F (Diodes Incorporated) provides 35,300 pcs. SMBJ33CE3/TR13 (Microchip Technology) has 1,073 pcs available.
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