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SMCJ300 Equivalent & Substitute Parts
Part Overview
The SMCJ300 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 300V reverse standoff voltage with a 510.3V maximum clamping voltage and 3.1A peak pulse current capability in a DO-214AB (SMC) package. The SMCJ300 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 300V |
| Voltage - Clamping (Max) @ Ipp | 510.3V |
| Current - Peak Pulse (10/1000µs) | 3.1A |
| Power - Peak Pulse | 1500W |
| Package / Case | DO-214AB, SMC |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 150°C |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the SMCJ300 are qualified based on the following critical parameters:
- Voltage - Reverse Standoff (Typ): 300V (exact match required)
- Voltage - Clamping (Max) @ Ipp: 480V–510V range (acceptable variation for equivalent protection)
- Current - Peak Pulse (10/1000µs): 3.1A–3.2A (compatible current handling)
- Package / Case: DO-214AB, SMC (identical form factor)
- Mounting Type: Surface Mount (identical mounting method)
- Power - Peak Pulse: 1500W (1.5kW) (identical power rating)
- RoHS Status: ROHS3 Compliant (regulatory compliance match)
All substitute parts maintain the same unidirectional zener TVS diode topology and general-purpose application profile as the original SMCJ300.
Parameter Comparison
| Parameter | SMCJ300 (Littelfuse) | SMCJ300A (Meritek) | 1.5SMC350AHE3_AIH (Vishay) | 1.5SMC350AHE3_ALL (Vishay) | SMCJ1.5KE350A-TP (MCC) |
|---|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 300V | 300V | 300V | 300V | 300V |
| Voltage - Breakdown (Min) | 317.7V | 335V | 333V | 333V | 332V |
| Voltage - Clamping (Max) @ Ipp | 510.3V | 486V | 482V | 482V | 482V |
| Current - Peak Pulse (10/1000µs) | 3.1A | 3.1A | 3.1A | 3.1A | 3.2A |
| Power - Peak Pulse | 1500W | 1500W | 1500W | 1500W | 1500W |
| Package / Case | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC |
| Operating Temperature Range | -55°C ~ 150°C | -55°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -55°C ~ 175°C |
| Product Status | Obsolete | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All substitute parts listed maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The SMCJ300A (Meritek) provides the closest electrical match with identical reverse standoff voltage, breakdown voltage, and peak pulse current specifications. The Vishay 1.5SMC350AHE3 variants (AIH and ALL) offer extended operating temperature range (-65°C to 150°C) and AEC-Q101 automotive qualification, suitable for applications requiring enhanced temperature performance or automotive-grade reliability. The SMCJ1.5KE350A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C and provides marginally higher peak pulse current (3.2A), accommodating designs with elevated thermal requirements.
Clamping voltage variations across substitutes (482V–510V) remain within acceptable engineering tolerance for general-purpose transient suppression, with all parts maintaining the 300V reverse standoff specification critical to circuit protection function.
Frequently Asked Questions (FAQ)
Q: Can SMCJ300A directly replace SMCJ300 in existing designs?
A: Yes. The SMCJ300A maintains identical reverse standoff voltage (300V), peak pulse current (3.1A), power rating (1500W), and DO-214AB package form factor. The clamping voltage difference (486V vs. 510.3V) falls within acceptable substitution tolerance for general-purpose TVS applications.
Q: What is the primary difference between Meritek SMCJ300A and Vishay 1.5SMC350AHE3 variants?
A: The Meritek part matches the original SMCJ300 operating temperature range (-55°C to 150°C), while Vishay variants extend to -65°C minimum and include AEC-Q101 automotive qualification. Clamping voltage is slightly lower on Vishay parts (482V vs. 486V–510.3V).
Q: Are the Vishay 1.5SMC350AHE3_AIH and 1.5SMC350AHE3_ALL electrically identical?
A: Yes. Both Vishay parts share identical electrical specifications, reverse standoff voltage, clamping voltage, peak pulse current, and operating temperature range. Designation differences reflect packaging or distribution channel variations only.
Q: Which substitute offers the widest operating temperature range?
A: The SMCJ1.5KE350A-TP (Micro Commercial Co) provides the widest operating temperature range at -55°C to 175°C, compared to -55°C to 150°C for SMCJ300A and -65°C to 150°C for Vishay variants.
Q: Do all substitutes maintain the same DO-214AB package footprint?
A: Yes. All substitute parts use the DO-214AB (SMC) surface-mount package, ensuring PCB layout compatibility without redesign.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the regulatory status of the original SMCJ300.
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