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1SMB48CAT3 Equivalent & Substitute Parts
Part Overview
The 1SMB48CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, rated for 48V reverse standoff voltage with a 77.4V maximum clamping voltage at peak pulse current. This component is designed for general-purpose transient voltage suppression in surface mount applications using the DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMB48CAT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Voltage - Reverse Standoff (Typ) | 48V |
| Voltage - Breakdown (Min) | 53.3V |
| Voltage - Clamping (Max) @ Ipp | 77.4V |
| Current - Peak Pulse (10/1000µs) | 7.7A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -65°C ~ 150°C (TJ) |
| Bidirectional Channels | 1 |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the 1SMB48CAT3 is determined by strict electrical and mechanical parameter matching:
Critical Parameters for Substitution:
- Voltage - Reverse Standoff (Typ): 48V
- Voltage - Breakdown (Min): 53.3V
- Voltage - Clamping (Max) @ Ipp: 77.4V
- Current - Peak Pulse (10/1000µs): 7.7A minimum
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB
- Bidirectional Channels: 1
Substitute parts are grouped into two categories:
Direct Substitutes: Parts with identical electrical specifications and active product status, suitable for direct replacement without circuit redesign.
Similar Substitutes: Parts meeting all critical electrical parameters with minor variations in peak pulse current (7.7A to 8.1A range) or operating temperature range, maintaining functional equivalence within the 48V TVS diode classification.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 1SMB48CAT3 | onsemi | 48V | 53.3V | 77.4V | 7.7A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Obsolete | RoHS non-compliant |
| SMBJ48CA | MDD | 48V | 53.3V | 77.4V | 7.8A | 600W | -50°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ48A-TP | Micro Commercial Co | 48V | 53.3V | 77.4V | 7.7A | 600W | -55°C ~ 175°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ48CA-13 | Diodes Incorporated | 48V | 53.3V | 77.4V | 7.7A | 600W | -55°C ~ 150°C | DO-214AA, SMB | Discontinued at DiGi Electronics | RoHS non-compliant |
| SMBJ48CA-13-F | Diodes Incorporated | 48V | 53.3V | 77.4V | 7.7A | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ48CA-HR | Littelfuse Inc. | 48V | 53.3V | 77.4V | 7.8A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ48CA-HRA | Littelfuse | 48V | 53.3V | 77.4V | 7.8A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ48CA-TP | Micro Commercial Co | 48V | 53.3V | 77.4V | 7.7A | 600W | -55°C ~ 175°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ48CA-TR | STMicroelectronics | 48V | 53.3V | 77.4V | 8.1A | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Preferred Direct Substitutes (Active Status, RoHS3 Compliant):
SMBJ48CA (MDD) and SMBJ48CA-13-F (Diodes Incorporated) are direct electrical equivalents with active product status and RoHS3 compliance. Both maintain the 48V reverse standoff voltage, 77.4V clamping voltage, and 600W peak pulse power rating. SMBJ48CA offers the widest inventory availability at 5539 pieces.
Extended Temperature Range Options:
SMBJ48A-TP and SMBJ48CA-TP (Micro Commercial Co) extend the operating temperature range to -55°C ~ 175°C, providing enhanced performance in extreme temperature environments while maintaining all critical electrical parameters and RoHS3 compliance.
SMBJ48CA-HR and SMBJ48CA-HRA (Littelfuse) offer the original -65°C ~ 150°C temperature range with active status and RoHS3 compliance, matching the thermal performance envelope of the obsolete 1SMB48CAT3.
Higher Peak Pulse Current Option:
SMBJ48CA-TR (STMicroelectronics) provides 8.1A peak pulse current, exceeding the 7.7A specification while maintaining all other critical parameters. This part offers additional margin for transient suppression applications.
Avoid:
SMBJ48CA-13 (Diodes Incorporated) is discontinued at DiGi Electronics and carries RoHS non-compliant status, limiting its suitability for new designs despite active electrical equivalence.
Frequently Asked Questions (FAQ)
Q: Can SMBJ48CA directly replace 1SMB48CAT3 without circuit modification?
A: Yes. SMBJ48CA maintains identical reverse standoff voltage (48V), breakdown voltage (53.3V), clamping voltage (77.4V), and power rating (600W). The 7.8A peak pulse current exceeds the original 7.7A specification, providing additional margin. Both use the DO-214AA (SMB) package with identical pinout and footprint.
Q: What is the difference between SMBJ48CA-TP and SMBJ48CA-TR?
A: Both are manufactured by different suppliers (Micro Commercial Co vs. STMicroelectronics) with identical electrical ratings. SMBJ48CA-TP operates from -55°C ~ 175°C, while SMBJ48CA-TR operates from -55°C ~ 150°C. SMBJ48CA-TR provides slightly higher peak pulse current (8.1A vs. 7.7A). Selection depends on temperature requirements and supplier availability.
Q: Why is SMBJ48CA-13 listed as discontinued?
A: SMBJ48CA-13 is discontinued at DiGi Electronics and carries RoHS non-compliant status. While electrically equivalent, its discontinuation status and compliance limitations make it unsuitable for new production designs. Active alternatives with RoHS3 compliance are available.
Q: Are all substitute parts available in the same packaging options?
A: All substitute parts use the DO-214AA (SMB) surface mount package. Packaging variations (Tape & Reel, Cut Tape, bulk) differ by manufacturer and supplier. Verify specific packaging requirements with your component distributor.
Q: What is the significance of the -HR and -HRA designations from Littelfuse?
A: The -HR and -HRA designations indicate Littelfuse's high-reliability product lines. Both SMBJ48CA-HR and SMBJ48CA-HRA maintain identical electrical specifications and operating temperature range (-65°C ~ 150°C) while offering enhanced reliability screening and documentation suitable for critical applications.
Q: Can I use SMBJ48CA-TR with its 8.1A peak pulse current in place of 7.7A rated parts?
A: Yes. The 8.1A peak pulse current is a higher specification that provides additional transient suppression margin. This part is functionally compatible and suitable for direct substitution in applications requiring the 48V TVS diode classification.
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