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Vishay General Semiconductor - Diodes Division 1.5SMC350A-E3/57T
- Part No.:
- 1.5SMC350A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC350A-E3/57T.pdf
- Description:
- TVS DIODE 300VWM 482VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,236
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Product details
Overview
1.5SMC350A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 350 V standoff voltage (VWM), 368 V maximum breakdown voltage (VBR), 482 V clamping voltage at 3.1 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 μs waveform - deployed in automotive power supplies, industrial motor controllers, and telecom DC feed protection.
For engineers reviewing the 1.5SMC350A-E3/57T datasheet, 1.5SMC350A-E3/57T pinout, 1.5SMC350A-E3/57T application, or 1.5SMC350A-E3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, SMC (DO-214AB) package compatibility, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse-biased voltage exceeds VBR (333–368 V), it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM).
The device sustains 1500 W peak pulse power per 10/1000 μs waveform with <0.01% duty cycle, exhibits fast response time (<1.0 ns), and maintains clamping voltage (VC = 482 V) within specification up to TJ = 150 °C - validated under JEDEC J-STD-020 MSL Level 1 reflow conditions (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 300 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working limit. |
| VBR (Breakdown) | 333–368 V at IT = 1 mA - Voltage range where avalanche conduction initiates; ensures predictable turn-on threshold. |
| VC (Clamping) | 482 V at IPPM = 3.1 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; critical for IC/MOSFET survival. |
| PPPM | 1500 W - Peak transient power dissipation capability; determines survivability against lightning or inductive switch-off surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads; governs derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum allowable junction temperature; sets upper limit for sustained power dissipation and surge repetition rate. |
| Polarity | Unidirectional - Cathode marked with band; blocks forward current until VF ≈ 3.5 V at 100 A, enabling DC-biased protection. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, RoHS-compliant, matte tin-plated leads solderable per J-STD-002/JESD 22-B102. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line. | Enables unidirectional clamping - conducts only when cathode is >300 V above anode; used in DC supply rail protection. |
| Cathode | Current exit point in forward bias; marked with band; connected to higher-potential side or ground reference. | Defines polarity-sensitive placement - must be tied to system ground or return path to shunt surge energy safely to earth/reference. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance in properly laid-out PCBs with 8 mm² copper pads per terminal. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage (<1 μA at 300 V), critical for high-reliability automotive and industrial deployments. |
| MSL Level 1 rating | Allows single-reflow assembly without moisture sensitivity concerns - compatible with standard 260 °C peak reflow profiles. |
| AEC-Q101 qualified (HE3/HM3 variants) | Validated for automotive under-hood applications; this E3/57T variant is commercial grade but shares identical die and package construction. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), preserving margin for 3.3 V/5 V logic interface protection. |
Applications
| Automotive Power Supply Protection | Industrial Motor Drive DC Bus |
|---|---|
Use Scenario: Protecting 24 V/48 V battery-fed ECUs from load dump (ISO 16750-2) and alternator transients. IC Role / Device Role / Timing Role: Shunt TVS placed across input filter capacitor to clamp spikes up to ±120 V, limiting stress on DC-DC converters and microcontrollers. Use Value: With 482 V clamping at 3.1 A, 1.5SMC350A-E3/57T prevents overvoltage failure of 36 V-rated input stages while surviving repeated 1500 W pulses. |
Use Scenario: Safeguarding IGBT gate drivers and bus voltage sensors in variable-frequency drives exposed to inductive kickback. IC Role / Device Role / Timing Role: Mounted across DC link capacitors to suppress switching-induced dv/dt spikes and commutation noise. Use Value: 300 V VWM allows operation on 400 V nominal bus; 482 V VC ensures MOSFETs rated ≥500 V remain within safe SOA during 10/1000 μs surges. |
| Telecom DC Feeder Protection | Renewable Energy Charge Controller Input |
Use Scenario: Shielding PoE injectors and remote radio units from lightning-induced surges on -48 V DC distribution lines. IC Role / Device Role / Timing Role: Unidirectional TVS installed between feed line and chassis ground to absorb common-mode transients without disrupting bias. Use Value: 1500 W PPPM and 75 °C/W RθJA enable robust protection in sealed outdoor enclosures with limited airflow and ambient up to 85 °C. |
Use Scenario: Securing solar charge controller inputs against reverse polarity connection errors and PV array surge events. IC Role / Device Role / Timing Role: Placed upstream of MPPT circuitry to clamp reverse-voltage faults and lightning-induced transients on 300–600 V PV strings. Use Value: 350 V VWM matches typical 400 V string configurations; 368 V VBR ensures reliable triggering before damage to buck converter MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ350A-E3/52 | Lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 90 °C/W), same VWM/VBR/VC specs. | Preferred for space-constrained designs with lower surge exposure (e.g., consumer electronics); not suitable for ISO 16750-2 load dump. | Select SMBJ350A-E3/52 only if board area is critical and peak surge energy remains ≤600 W. |
| 1.5KE350A | Through-hole DO-201 package, identical electrical specs, higher mechanical robustness but incompatible with SMT assembly. | Used in legacy industrial controls or repair scenarios requiring hand-soldered replacements; no reflow compatibility. | Choose 1.5KE350A only for through-hole prototyping or field-service replacement where SMT is unavailable. |
Compared with SMBJ350A-E3/52 and 1.5KE350A, the 1.5SMC350A-E3/57T uniquely balances 1500 W surge capacity, SMT manufacturability, and thermal performance in the SMC footprint - making it optimal for automotive and industrial production where both reliability and assembly efficiency are required.
Availability
1.5SMC350A-E3/57T is available at Aetrix Electronics and suitable for automotive ECU protection, industrial motor drive DC bus safeguarding, and telecom DC feeder surge suppression requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC350A-E3/57T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The 1.5SMC Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against lightning, load dump, and inductive switching is mandatory.
FAQ
What is the clamping voltage of the 1.5SMC350A-E3/57T under a 10/1000 μs surge?
The 1.5SMC350A-E3/57T has a maximum clamping voltage (VC) of 482 V at a peak pulse current (IPPM) of 3.1 A with a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88303 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream components like MOSFETs or DC-DC controllers remain within safe operating area.
Is the 1.5SMC350A-E3/57T AEC-Q101 qualified?
No, the 1.5SMC350A-E3/57T is RoHS-compliant commercial-grade with E3 suffix; AEC-Q101 qualification applies only to HE3 or HM3 variants (e.g., 1.5SMC350AHE3_B). The 1.5SMC350A-E3/57T shares identical die and SMC package construction but lacks the extended automotive test validation - use HE3_B for under-hood automotive applications requiring AEC-Q101 certification.
What is the standoff voltage (VWM) and why does it matter for 1.5SMC350A-E3/57T placement?
The 1.5SMC350A-E3/57T has a VWM of 300 V, meaning it remains non-conductive up to this reverse voltage. This parameter dictates placement: it must be selected so that normal operating voltage (e.g., 400 V DC bus) stays below VBR but well above VWM to avoid leakage or thermal runaway - ensuring the 1.5SMC350A-E3/57T activates only during fault conditions, not steady-state operation.
Can the 1.5SMC350A-E3/57T be used in bidirectional protection circuits?
No - the 1.5SMC350A-E3/57T is unidirectional, indicated by the "A" suffix and cathode band marking. For bidirectional protection, select the "CA" variant (e.g., 1.5SMC350CA), which provides symmetrical clamping in both polarities. Using the 1.5SMC350A-E3/57T in AC or floating applications risks forward conduction and failure due to lack of reverse-blocking capability.
What is the thermal resistance and how does it affect 1.5SMC350A-E3/57T layout?
The 1.5SMC350A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This means each watt of sustained power raises junction temperature by 75 °C - so layout must provide adequate copper area and minimize trace length to maintain TJ ≤ 150 °C during repetitive surges or elevated ambient conditions.
1.5SMC350A-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 300V
- Voltage - Breakdown (Min):
- 333V
- Voltage - Clamping (Max) @ Ipp:
- 482V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC350A-E3/57T FAQ
1.How can I place an order for 1.5SMC350A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC350A-E3/57T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1.5SMC350A-E3/57T reliable?
The price and inventory of 1.5SMC350A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC350A-E3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC350A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC350A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC350A-E3/57T?
1.5SMC350A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC350A-E3/57T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1.5SMC350A-E3/57T?
For technical support, including 1.5SMC350A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC350A-E3/57T requirements.
6.How does Aetrix verify that 1.5SMC350A-E3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC350A-E3/57T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1.5SMC350A-E3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC350A-E3/57T?
All 1.5SMC350A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC350A-E3/57T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1.5SMC350A-E3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC350A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC350A-E3/57T Tags
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