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SMBJ33A-T7 Equivalent & Substitute Parts
Part Overview
The SMBJ33A-T7 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 33V reverse standoff voltage and provides 600W peak pulse power dissipation in a DO-214AA (SMB) package. The part is active in production and RoHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and manufacturing optimization while maintaining electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 33 | V |
| Voltage - Breakdown (Min) | 36.7 | V |
| Voltage - Clamping (Max) @ Ipp | 53.3 | V |
| Current - Peak Pulse (10/1000µs) | 11.3 | A |
| Power - Peak Pulse | 600 | W |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ33A-T7 are qualified based on the following electrical and mechanical criteria:
Electrical Parameters (Must Match):
- Voltage - Reverse Standoff (Typ): 33V
- Voltage - Breakdown (Min): 36.7V
- Voltage - Clamping (Max) @ Ipp: 53.3V
- Current - Peak Pulse (10/1000µs): 11.3A (tolerance ±0.5A acceptable)
- Power - Peak Pulse: 600W
- Type: Zener, Unidirectional
Mechanical Parameters (Must Match):
- Package / Case: DO-214AA, SMB
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Acceptable Variations:
- Operating Temperature Range: Minimum -55°C acceptable (main part: -65°C); Maximum 150°C or higher acceptable
- Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® are interchangeable for procurement
- Manufacturer: Different qualified manufacturers permitted
All substitute parts listed maintain identical electrical performance and package compatibility with the SMBJ33A-T7.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ33A-T7 | Littelfuse Inc. | 33 | 36.7 | 53.3 | 11.3 | 600 | -65 to 150 | DO-214AA, SMB | ROHS3 |
| SMBJ33A | Good-Ark Semiconductor | 33 | 36.7 | 53.3 | 11.3 | 600 | -55 to 150 | DO-214AA, SMB | ROHS3 |
| SZ1SMB33AT3G | Littelfuse | 33 | 36.7 | 53.3 | 11.3 | 600 | -65 to 150 | DO-214AA, SMB | ROHS3 |
| 1SMB33A TR13 PBFREE | Central Semiconductor Corp | 33 | 36.7 | 53.3 | 11.3 | 600 | -65 to 150 | DO-214AA, SMB | ROHS3 |
| SMBJ33A-13-F | Diodes Incorporated | 33 | 36.7 | 53.3 | 11.3 | 600 | -55 to 150 | DO-214AA, SMB | ROHS3 |
| SMBJ33A-E3/52 | Vishay General Semiconductor - Diodes Division | 33 | 36.7 | 53.3 | 11.3 | 600 | -55 to 150 | DO-214AA, SMB | ROHS3 |
| SMBJ33A-M3/52 | Vishay General Semiconductor - Diodes Division | 33 | 36.7 | 53.3 | 11.3 | 600 | -55 to 150 | DO-214AA, SMB | ROHS3 |
| SMBJ33A-TP | Micro Commercial Co | 33 | 36.7 | 53.3 | 11.3 | 600 | -55 to 175 | DO-214AA, SMB | ROHS3 |
| SMBJ33A-TR | STMicroelectronics | 33 | 36.7 | 53.3 | 11.8 | 600 | -55 to 150 | DO-214AA, SMB | ROHS3 |
Engineering Selection Recommendations
All listed substitute parts maintain full electrical and mechanical compatibility with the SMBJ33A-T7. Selection among qualified substitutes is based on the following factors:
Supply Chain Availability: Good-Ark Semiconductor SMBJ33A offers the highest inventory level (17,111 pcs), providing optimal supply continuity. Littelfuse SZ1SMB33AT3G (16,623 pcs) and Vishay SMBJ33A-E3/52 (10,126 pcs) represent secondary sources with substantial stock.
Temperature Range Considerations: The SMBJ33A-T7 operates from -65°C to 150°C. Substitute parts from Good-Ark, Diodes, Vishay, and STMicroelectronics operate from -55°C to 150°C, which is acceptable for applications not requiring the extended lower temperature range. The Micro Commercial Co SMBJ33A-TP extends to 175°C maximum, providing additional thermal margin for high-temperature environments.
Compliance and Certifications: All parts are RoHS3 compliant with MSL 1 (Unlimited). The Littelfuse SZ1SMB33AT3G carries AEC-Q101 automotive qualification, suitable for automotive-grade applications.
Peak Pulse Current: The STMicroelectronics SMBJ33A-TR specifies 11.8A peak pulse current, compared to 11.3A for other parts. This represents a 4.4% increase and remains within acceptable tolerance for the 600W power rating.
Packaging Format: All parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats, supporting both high-volume and low-volume procurement strategies.
Frequently Asked Questions (FAQ)
Q: Can I substitute SMBJ33A-TR from STMicroelectronics for SMBJ33A-T7?
A: Yes. The SMBJ33A-TR maintains identical reverse standoff voltage (33V), breakdown voltage (36.7V), clamping voltage (53.3V), and power rating (600W). The peak pulse current specification of 11.8A is 0.5A higher than the 11.3A of the SMBJ33A-T7, which is within acceptable tolerance for the same power class. Both use DO-214AA SMB packaging and are RoHS3 compliant.
Q: What is the difference between SMBJ33A-E3/52 and SMBJ33A-M3/52?
A: Both parts are manufactured by Vishay General Semiconductor and share identical electrical specifications (33V standoff, 36.7V breakdown, 53.3V clamping, 11.3A peak pulse, 600W power). The difference lies in packaging format: SMBJ33A-E3/52 is supplied in Cut Tape (CT) & Digi-Reel®, while SMBJ33A-M3/52 is supplied in Tape & Reel (TR). Electrical performance and mechanical compatibility are equivalent.
Q: Is the Littelfuse SZ1SMB33AT3G suitable for automotive applications?
A: Yes. The SZ1SMB33AT3G carries AEC-Q101 automotive qualification and is part of the TransZorb® series. It maintains the same electrical parameters as the SMBJ33A-T7 and is RoHS3 compliant, making it suitable for automotive-grade overvoltage protection circuits.
Q: Can I use SMBJ33A-TP in applications requiring -65°C operation?
A: The SMBJ33A-TP from Micro Commercial Co operates from -55°C to 175°C. If your application requires operation at -65°C, this part is not suitable. Use SMBJ33A-T7, SZ1SMB33AT3G, or 1SMB33A TR13 PBFREE, which all support -65°C minimum operating temperature.
Q: Are all substitute parts available in the same package?
A: Yes. All substitute parts use the DO-214AA SMB surface-mount package. Packaging format (Tape & Reel or Cut Tape & Digi-Reel®) varies by manufacturer and part number, but the physical component package remains identical, ensuring PCB footprint compatibility.
Q: What is the difference between Good-Ark SMBJ33A and Littelfuse SMBJ33A-T7?
A: Both parts are electrically identical with 33V standoff voltage, 36.7V breakdown, 53.3V clamping, 11.3A peak pulse, and 600W power rating. The primary difference is operating temperature range: SMBJ33A-T7 operates from -65°C to 150°C, while Good-Ark SMBJ33A operates from -55°C to 150°C. For applications not requiring -65°C operation, the Good-Ark part offers superior supply availability (17,111 pcs in stock).
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