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1SMC30AT3 Equivalent & Substitute Parts
Part Overview
The 1SMC30AT3 is a 1500W unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi with a 30V reverse standoff voltage rating. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The part operates in the SMC/DO-214AB package and provides clamping protection for transient voltage events in general-purpose applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMC30AT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Description | TVS 1500W 30V UNIDIRECT SMC |
| Product Status | Obsolete |
| Power - Peak Pulse | 1500W (1.5kW) |
| Voltage - Reverse Standoff (Typ) | 30V |
| Package / Case | SMC/DO-214AB |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the 1SMC30AT3 is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 30V
- Power - Peak Pulse: 1500W (1.5kW)
- Package / Case: SMC/DO-214AB
- Mounting Type: Surface Mount
- Unidirectional Configuration: Single channel
All identified substitute parts maintain the 30V reverse standoff voltage, 1500W peak pulse power rating, and SMC/DO-214AB surface mount package. Variations in clamping voltage and peak pulse current specifications reflect different manufacturer designs while preserving the core functional requirements for transient suppression at the 30V protection level.
Parameter Comparison
| Parameter | 1SMC30AT3 (onsemi) | SMCJ30A (MDD) | SMCJ30A-TP (Micro Commercial Co) | SMCJ30A-TR (STMicroelectronics) |
|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 30V | 30V | 30V | 30V |
| Voltage - Breakdown (Min) | — | 33.3V | 33.3V | 33.3V |
| Voltage - Clamping (Max) @ Ipp | — | 48.4V | 48.4V | 64.3V |
| Current - Peak Pulse | — | 31A (10/1000µs) | 31A (10/1000µs) | 156A (8/20µs) |
| Power - Peak Pulse | 1500W | 1500W | 1500W | 1500W |
| Type | Zener | Zener | Zener | Zener |
| Unidirectional Channels | 1 | 1 | 1 | 1 |
| Package / Case | SMC/DO-214AB | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Operating Temperature | — | -50°C ~ 150°C (TJ) | -55°C ~ 175°C (TJ) | -55°C ~ 150°C (TJ) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitutes: SMCJ30A (MDD) and SMCJ30A-TP (Micro Commercial Co) are direct functional equivalents, maintaining identical reverse standoff voltage, breakdown voltage, and peak pulse power specifications. Both are active products with ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete 1SMC30AT3.
Alternative Substitute: SMCJ30A-TR (STMicroelectronics) maintains the 30V reverse standoff voltage and 1500W power rating but exhibits higher clamping voltage (64.3V) and peak pulse current (156A at 8/20µs). This part is suitable for applications where higher current handling and clamping voltage tolerance are acceptable.
Compliance Consideration: All substitute parts are ROHS3 compliant and carry active product status, providing long-term availability and regulatory alignment compared to the obsolete, RoHS non-compliant 1SMC30AT3.
Frequently Asked Questions (FAQ)
Q: Can SMCJ30A-TR be used as a direct replacement for 1SMC30AT3?
A: SMCJ30A-TR maintains the critical 30V reverse standoff voltage and 1500W power rating required for functional equivalence. However, the higher clamping voltage (64.3V versus 48.4V in MDD variants) and different peak pulse current specification (156A at 8/20µs) indicate a different transient response profile. Selection depends on circuit tolerance for clamping voltage variation.
Q: What is the difference between SMCJ30A and SMCJ30A-TP?
A: Both parts are electrically identical with 30V reverse standoff, 33.3V minimum breakdown, 48.4V maximum clamping voltage, and 31A peak pulse current. The primary difference is packaging: SMCJ30A-TP is supplied in Tape & Reel format with an extended operating temperature range (-55°C to 175°C versus -50°C to 150°C), making it suitable for high-temperature applications.
Q: Are all substitute parts in the SMC/DO-214AB package?
A: Yes. All identified substitutes use the SMC/DO-214AB surface mount package, ensuring mechanical and thermal compatibility with the original 1SMC30AT3 footprint.
Q: Why is the 1SMC30AT3 obsolete?
A: The 1SMC30AT3 is classified as obsolete by onsemi. Active equivalent parts from MDD, Micro Commercial Co, and STMicroelectronics provide current manufacturing support and regulatory compliance for new designs and ongoing procurement.
Q: Do substitute parts meet RoHS requirements?
A: Yes. SMCJ30A (MDD), SMCJ30A-TP (Micro Commercial Co), and SMCJ30A-TR (STMicroelectronics) are all ROHS3 compliant, addressing the RoHS non-compliance status of the original 1SMC30AT3.
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