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1SMB14CAT3 Equivalent & Substitute Parts
Part Overview
The 1SMB14CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 14V reverse standoff voltage with a 23.2V maximum clamping voltage and 25.8A peak pulse current capability in the DO-214AA (SMB) package. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMB14CAT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Voltage - Reverse Standoff (Typ) | 14V |
| Voltage - Breakdown (Min) | 15.6V |
| Voltage - Clamping (Max) @ Ipp | 23.2V |
| Current - Peak Pulse (10/1000µs) | 25.8A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -65°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the 1SMB14CAT3 is determined by strict equivalence across the following critical electrical and mechanical parameters:
Electrical Equivalence Criteria:
- Voltage - Reverse Standoff (Typ): 14V
- Voltage - Breakdown (Min): 15.5V to 15.6V
- Voltage - Clamping (Max) @ Ipp: 23.2V
- Current - Peak Pulse (10/1000µs): 25.8A to 25.9A
- Power - Peak Pulse: 600W
- Bidirectional Channels: 1
- Type: Zener
Mechanical Equivalence Criteria:
- Package / Case: DO-214AA, SMB
- Mounting Type: Surface Mount
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
All substitute parts listed maintain these parameters within the specified tolerances. Substitute parts are grouped by manufacturer and product status (Active vs. Obsolete).
Parameter Comparison
| Part Number | Manufacturer | VWM (Typ) | VBR (Min) | VC (Max) | Ipp (A) | Temp Range | Status | RoHS |
|---|---|---|---|---|---|---|---|---|
| 1SMB14CAT3 | onsemi | 14V | 15.6V | 23.2V | 25.8A | -65°C ~ 150°C | Obsolete | Non-compliant |
| SMBJ14CA | MDD | 14V | 15.6V | 23.2V | 25.9A | -50°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ14CA-13-F | Diodes Incorporated | 14V | 15.6V | 23.2V | 25.8A | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ14CA-HR | Littelfuse Inc. | 14V | 15.6V | 23.2V | 25.9A | -65°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ14CA-HRA | Littelfuse Inc. | 14V | 15.6V | 23.2V | 25.9A | -65°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ14CA-M3/52 | Vishay General Semiconductor - Diodes Division | 14V | 15.5V | 23.2V | 25.9A | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ14CA-M3/5B | Vishay General Semiconductor - Diodes Division | 14V | 15.5V | 23.2V | 25.9A | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ14CA-TP | Micro Commercial Co | 14V | 15.6V | 23.2V | 25.8A | -55°C ~ 175°C | Active | ROHS3 Compliant |
| SMBJ14CAE3/TR13 | Microchip Technology | 14V | 15.6V | 23.2V | 25.8A | -65°C ~ 150°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts are electrically and mechanically equivalent to the 1SMB14CAT3 within the specified parameter tolerances. Selection should be based on the following factors:
Product Status: All substitute parts listed carry Active product status, ensuring long-term availability and manufacturing support compared to the obsolete 1SMB14CAT3.
Regulatory Compliance: All substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements that the original non-compliant part does not meet. This is a critical consideration for new designs and procurement in regulated markets.
Temperature Range: SMBJ14CA-HR, SMBJ14CA-HRA, and SMBJ14CAE3/TR13 maintain the full -65°C to 150°C operating range of the original part. SMBJ14CA-TP extends the upper temperature limit to 175°C, providing additional thermal margin in high-temperature applications.
Packaging and Availability: All parts use the DO-214AA (SMB) surface mount package with identical pinout and footprint compatibility. Inventory levels vary by manufacturer and part variant, with SMBJ14CA-TP offering the highest stock availability at 4200 units.
Manufacturer Variants: MDD SMBJ14CA, Littelfuse SMBJ14CA-HR/HRA, Vishay SMBJ14CA-M3 series, and Microchip SMBJ14CAE3/TR13 represent established manufacturers with established supply chains and quality certifications.
Frequently Asked Questions (FAQ)
Q: Can I directly replace 1SMB14CAT3 with any of the listed substitute parts?
A: Yes. All listed parts meet the electrical specifications (14V standoff, 23.2V clamping, 25.8-25.9A peak pulse) and use the identical DO-214AA (SMB) surface mount package. Footprint and pinout are fully compatible with no circuit modifications required.
Q: What is the primary reason to substitute the 1SMB14CAT3?
A: The original part is classified as obsolete. All substitute parts carry Active product status, ensuring continued manufacturing, availability, and support. Additionally, all substitutes are ROHS3 compliant, addressing regulatory requirements not met by the original part.
Q: Are there differences in operating temperature ranges among the substitutes?
A: Yes. Most substitutes operate from -50°C to -65°C minimum to 150°C maximum. SMBJ14CA-TP extends the upper limit to 175°C. SMBJ14CA operates from -50°C minimum, which is 15°C warmer than the original part's -65°C minimum. Verify your application's temperature requirements before selection.
Q: Do all substitutes have the same peak pulse current rating?
A: Nearly all substitutes are rated at 25.8A to 25.9A peak pulse current, matching the original 25.8A specification. This variation is within normal manufacturing tolerance and does not affect circuit compatibility.
Q: What is the difference between SMBJ14CA-M3/52 and SMBJ14CA-M3/5B?
A: Both are Vishay TransZorb® series parts with identical electrical specifications and operating temperature range (-55°C to 150°C). The suffix designates different packaging configurations (tape reel variants). Electrical performance is equivalent; selection depends on your procurement and assembly requirements.
Q: Are all substitutes available in tape and reel packaging?
A: Yes. All listed substitute parts are available in Tape & Reel (TR) packaging suitable for automated assembly processes. The MDD SMBJ14CA is listed with standard packaging designation.
Q: Which substitute offers the best long-term availability?
A: SMBJ14CA-TP from Micro Commercial Co currently shows the highest inventory level at 4200 units. However, all listed parts carry Active product status from established manufacturers, ensuring continued availability. Consult your distributor for current stock levels and lead times.
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