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Vishay General Semiconductor - Diodes Division SM6S33A-E3/2D
- Part No.:
- SM6S33A-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM6S33A-E3/2D.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,592
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Product details
Overview
SM6S33A-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection in 12 V and 24 V systems. It features a 33.0 V stand-off voltage (VWM), 36.7–40.6 V breakdown range (VBR), 53.3 V clamping voltage at 86 A peak pulse current (10/1000 μs), 4600 W peak pulse power, and AEC-Q101 qualification for under-hood reliability.
For engineers reviewing the SM6S33A-E3/2D datasheet, SM6S33A-E3/2D pinout, SM6S33A-E3/2D application, or SM6S33A-E3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 0.95 °C/W), 175 °C junction rating, ISO7637-2 compliance, and low leakage (<10 μA at VWM).
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive electronics, conducting only when reverse voltage exceeds its breakdown threshold. Its passivated anisotropic rectifier structure enables stable operation up to TJ = 175 °C and supports high-reliability automotive environments where thermal cycling and surge stress are common.
The DO-218AB package integrates a metal heatsink (anode terminal) for low thermal resistance and high surge current handling (IFSM = 600 A). Its 10/1000 μs waveform rating of 4600 W and 10/10,000 μs rating of 3600 W reflect robust energy absorption capability validated per ISO7637-2 load dump test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 36.7 V / 40.6 V - Breakdown occurs within this range at 5 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 53.3 V - Clamped voltage at 86 A peak pulse current (10/1000 μs); determines protected circuit's maximum transient exposure |
| PPPM (10/1000 μs) | 4600 W - Peak surge power it can absorb without failure; critical for load dump immunity |
| TJ max. | 175 °C - Maximum junction temperature; enables placement near hot engine compartments |
| Polarity | Unidirectional - Blocks forward current like a rectifier; conducts only on reverse overvoltage |
| Package | DO-218AB - Surface-mount case with integral metal heatsink (anode) for low RθJC = 0.95 °C/W |
Pinout & Package
DO-218AB package features two terminals: Lead 1 (cathode, marked end) and Lead 2 / Metal Heatsink (anode). The heatsink serves as both mechanical mounting surface and primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Transient sensing and clamping node | Connected to protected line (e.g., battery rail); conducts surge current to anode during overvoltage |
| Lead 2 / Metal Heatsink (anode) | Reference and thermal interface | Electrically tied to system ground or chassis; provides low-impedance thermal path to PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier technology ensures stable VBR and low leakage over lifetime and temperature |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| ISO7637-2 compliance | Meets automotive load dump surge immunity requirements (10 ms exponential waveform, up to 60 V) |
| MSL Level 1 | Moisture sensitivity level 1 per J-STD-020 - no floor life limitation; safe for standard reflow |
| Low VF at high IF | Max 1.9 V forward voltage at 100 A enables efficient clamping without excessive forward conduction loss |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting ECUs, body control modules, and infotainment systems during alternator load dump events in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across battery input rail to clamp transients up to 60 V. Use Value: Limits voltage seen by downstream ICs to ≤53.3 V at 86 A, preventing latch-up or gate oxide damage. | Use Scenario: Safeguarding DC-DC converters and PMICs in dual-voltage architectures (e.g., 12 V main bus + 24 V subsystem). IC Role / Device Role / Timing Role: Standoff-rated clamping device with 33.0 V VWM ensures normal operation during nominal 28.5 V battery conditions. Use Value: Maintains <10 μA leakage at VWM, minimizing quiescent current drain in always-on vehicle networks. |
| Engine Control Unit (ECU) Input Protection | Industrial CAN Bus Power Line Protection |
Use Scenario: Shielding microcontroller I/O and sensor interfaces from inductive switching spikes in engine management systems. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) clamping element on power inputs and signal lines with shared ground reference. Use Value: Withstands 600 A non-repetitive surge (IFSM), surviving repeated starter motor engagement transients. | Use Scenario: Protecting industrial CAN transceivers and isolated power supplies connected to long cable runs subject to lightning-induced surges. IC Role / Device Role / Timing Role: High-energy TVS on 24 V CAN power rail, leveraging DO-218AB thermal mass for sustained dissipation. Use Value: Delivers 3600 W surge rating at 10/10,000 μs - matching long-tail surge profiles typical in factory automation wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5B | DO-214AC (SMA) package; lower PPPM (400 W); higher RθJC (~50 °C/W); same VWM/VBR range | Limited to lower-energy transients; unsuitable for ISO7637-2 load dump; better for board-level ESD | Select when space-constrained layout prohibits DO-218AB footprint and surge demands are sub-1 kW |
| TPSMD33A | DO-218AB package; identical VWM/VBR/VC specs; 5000 W PPPM (10/1000 μs); not AEC-Q101 qualified | Higher surge margin but lacks automotive qualification; requires additional reliability validation for vehicle use | Choose for industrial 24 V systems needing extra headroom where AEC-Q101 is not mandated |
Compared with SMAJ33A-E3/5B and TPSMD33A, SM6S33A-E3/2D uniquely balances AEC-Q101 qualification, ISO7637-2 compliance, and DO-218AB thermal performance-making it the preferred choice for production automotive power rail protection where reliability and standardized testing are mandatory.
Availability
SM6S33A-E3/2D is available at Aetrix Electronics and suitable for automotive ECU design, 12 V/24 V power distribution units, and industrial CAN bus power conditioning requiring stable component supply and full traceability.
Supply support for SM6S33A-E3/2D 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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-grade solutions.
The SM6SxxA series is part of Vishay's PAR® TVS platform, engineered specifically for automotive load dump and inductive switching surge suppression in harsh-temperature environments up to 175 °C.
FAQ
What is the clamping voltage of the SM6S33A-E3/2D at its rated peak pulse current?
The SM6S33A-E3/2D has a maximum clamping voltage (VC) of 53.3 V when subjected to its specified peak pulse current (IPPM) of 86 A using the 10/1000 μs waveform. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during a surge event. The SM6S33A-E3/2D maintains this clamping performance across its operational temperature range due to its passivated junction design.
Is the SM6S33A-E3/2D suitable for bidirectional transient suppression?
No, the SM6S33A-E3/2D is a unidirectional TVS diode and is not suitable for bidirectional suppression. Its electrical behavior mirrors that of a rectifier: it blocks forward current and clamps only reverse overvoltages. For AC or bipolar signal line protection, a bidirectional variant such as SM6S33CA would be required. The SM6S33A-E3/2D datasheet explicitly states "Available in uni-directional polarity only" and identifies the heatsink as the anode terminal.
Does the SM6S33A-E3/2D meet automotive qualification standards?
Yes, the SM6S33A-E3/2D is AEC-Q101 qualified and meets MSL Level 1 per J-STD-020. It is also compliant with ISO7637-2 for load dump surge immunity under defined test conditions. These qualifications are documented in Vishay's official datasheet (Document Number: 88384, Revision: 22-Jul-16) and confirmed by the "HE3" suffix, which denotes RoHS-compliant, AEC-Q101-qualified construction. The SM6S33A-E3/2D is intended for under-hood and other high-reliability automotive applications.
What is the thermal resistance from junction to case (RθJC) for the SM6S33A-E3/2D?
The SM6S33A-E3/2D has a typical thermal resistance from junction to case (RθJC) of 0.95 °C/W, as specified in the Thermal Characteristics section of its datasheet. This low value is enabled by the DO-218AB package's integrated metal heatsink (anode terminal), which provides an efficient thermal path to the PCB copper. Proper PCB layout with ≥1 cm² of 2 oz copper connected to the heatsink is required to realize this thermal performance in practice. The SM6S33A-E3/2D relies on this thermal path to sustain its 4600 W peak pulse rating.
How does the SM6S33A-E3/2D differ from the SM6S33A without the -E3/2D suffix?
The -E3/2D suffix on SM6S33A-E3/2D indicates RoHS-compliant matte tin plating (E3) and packaging in 13" diameter plastic tape and reel with anode orientation toward the sprocket hole (2D). The base device SM6S33A refers to the electrical and thermal specifications only; the suffix defines environmental compliance and packaging format. All SM6S33A-E3/2D units meet the same VWM, VBR, VC, and surge ratings as the generic SM6S33A, but the -E3/2D variant is the standard orderable version for automated SMT assembly. The SM6S33A-E3/2D is the recommended part for new designs requiring lead-free compliance and reel-fed placement.
SM6S33A-E3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 86A
- Power - Peak Pulse:
- 4600W (4.6kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM6S33A-E3/2D FAQ
1.How can I place an order for SM6S33A-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S33A-E3/2D 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 SM6S33A-E3/2D reliable?
The price and inventory of SM6S33A-E3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S33A-E3/2D is usually 5 days.
3.What payment methods are accepted for SM6S33A-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S33A-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S33A-E3/2D?
SM6S33A-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S33A-E3/2D 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 SM6S33A-E3/2D?
For technical support, including SM6S33A-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S33A-E3/2D requirements.
6.How does Aetrix verify that SM6S33A-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM6S33A-E3/2D 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 SM6S33A-E3/2D meets industry standards.
7.What is the process for return or replacement of SM6S33A-E3/2D?
All SM6S33A-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM6S33A-E3/2D, 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 SM6S33A-E3/2D part is unused and in its original packaging.
Return procedure for SM6S33A-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S33A-E3/2D Tags
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