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Vishay General Semiconductor - Diodes Division SM6S33ATHE3/I
- Part No.:
- SM6S33ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S33ATHE3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,736
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Product details
Overview
SM6S33ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 5 mA, 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 applications.
For engineers reviewing the SM6S33ATHE3/I datasheet, SM6S33ATHE3/I pinout, SM6S33ATHE3/I application, or SM6S33ATHE3/I equivalent, this device serves as a high-reliability, high-temperature (TJ = 175 °C) TVS diode in 12 V/24 V automotive power networks where ISO 7637-2 compliance and low leakage (<10 μA at VWM) are critical selection criteria.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance across -55 °C to +175 °C junction temperature. Its DO-218AC package integrates a metal heatsink (anode) for low thermal resistance (RθJC = 0.95 °C/W) and high surge capability (IFSM = 600 A).
The device operates exclusively in unidirectional mode with polarity defined by heatsink-as-anode configuration. It meets MSL Level 1 per J-STD-020 (245 °C peak reflow) and passes JESD201 Class 2 whisker testing due to its matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/typ/max) | 36.7 / 38.7 / 40.6 V at 5 mA - precise breakdown threshold enabling accurate overvoltage triggering |
| VC @ IPPM | 53.3 V at 86 A (10/1000 μs) - clamping voltage limiting downstream circuit stress during transients |
| PPPM (10/1000 μs) | 4600 W - peak transient energy absorption capacity for severe load dump events |
| ID @ VWM | <10 μA at 25 °C - ultra-low leakage preserving battery drain-critical systems |
| TJ max. | +175 °C - enables placement near hot engine compartments without derating |
| Polarity | Unidirectional, anode = metal heatsink - defines PCB layout orientation and grounding strategy |
Pinout & Package
Package: DO-218AC - surface-mount, thermally enhanced case with integral metal heatsink (anode terminal); RoHS-compliant, AEC-Q101 qualified, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (metal heatsink) | Positive terminal / thermal path | Must be soldered to large copper pour for thermal management; electrically connects to system ground or battery positive depending on protection topology |
| Cathode (lead 1) | Transient current sink | Connected to protected line (e.g., alternator output); conducts surge current to anode/heatsink during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable VBR over lifetime and temperature cycling |
| TJ = 175 °C rating | Enables direct mounting on high-temperature automotive modules without external heat sinking |
| ISO 7637-2 compliance | Validated for load dump waveforms (test condition dependent), supporting OEM-level ECU certification |
| Low forward voltage drop | VF ≤ 1.9 V at 100 A - minimizes conduction loss during high-current surges |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 245 °C peak, eliminating moisture sensitivity handling |
Applications
| Automotive Alternator Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses 12 V system load dump transients (up to 35 V, 400 ms) generated when battery disconnects during alternator operation. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between alternator output and main power rail. Use Value: Limits voltage to ≤53.3 V during 4600 W surges, protecting downstream DC-DC converters and microcontrollers rated for 36 V absolute max. |
Use Scenario: Guards ECU power inputs against coupled transients from solenoid switching (fuel injectors, ignition coils) in engine bay environments. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply input prior to LDO regulator stage. Use Value: Withstands 600 A non-repetitive surge (IFSM) and maintains <10 μA leakage at 33 V, ensuring low quiescent current in always-on modules. |
| Body Control Module (BCM) Power Rail | Advanced Driver Assistance Systems (ADAS) Camera Power |
Use Scenario: Protects BCM power distribution nodes from inductive kickback during relay and motor actuation (windows, locks, lighting). IC Role / Device Role / Timing Role: High-power TVS on fused 12 V feed to central body electronics cluster. Use Value: 0.95 °C/W thermal resistance allows direct PCB copper heatsinking, eliminating need for discrete thermal pads or clips. |
Use Scenario: Shields ADAS camera module power input from transients induced by nearby radar or infotainment switching noise. IC Role / Device Role / Timing Role: Final-stage transient suppressor before low-noise LDO supplying image sensor and ISP. Use Value: AEC-Q101 qualification and TJ = 175 °C rating ensure reliability in sealed, thermally constrained camera housings exposed to sunlight heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S33AHM3 | Same VWM/VBR/VC specs; HM3 suffix indicates halogen-free molding compound and enhanced robustness vs. mechanical stress | Preferred for new designs targeting long-term material compliance and higher board-level shock/vibration tolerance | Select SM6S33AHM3 for new automotive programs; SM6S33ATHE3/I remains valid for legacy production continuity |
| SMAJ33A | Lower PPPM (400 W vs. 4600 W), SMA package (DO-214AC), RθJC ≈ 45 °C/W - significantly lower surge capacity and thermal performance | Suitable only for low-energy transients (e.g., ESD, small inductive loads); not rated for load dump | Use SMAJ33A only where peak surge energy is <500 W; SM6S33ATHE3/I is required for ISO 7637-2 load dump compliance |
Compared with SM6S33AHM3, SM6S33ATHE3/I offers identical electrical protection but lacks halogen-free certification and enhanced mechanical ruggedness; compared with SMAJ33A, it delivers 11.5× higher surge power and 47× better thermal resistance - making it the sole choice for under-hood load dump protection.
Availability
SM6S33ATHE3/I is available at Aetrix Electronics and suitable for automotive power distribution, engine control unit (ECU) protection, and body control module (BCM) designs requiring stable component supply across extended production lifecycles.
Supply support for SM6S33ATHE3/I 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM6SxxAT family was engineered specifically for AEC-Q101-compliant automotive transient suppression, emphasizing high-temperature stability, ISO 7637-2 load dump capability, and robust packaging for under-hood deployment.
FAQ
What is the maximum clamping voltage of the SM6S33ATHE3/I during a 10/1000 μs surge?
The SM6S33ATHE3/I clamps to a maximum of 53.3 V at 86 A peak pulse current under the 10/1000 μs waveform. This value is measured per standard test conditions (TC = 25 °C) and ensures downstream ICs with 36 V absolute maximum ratings remain within safe operating limits during load dump events. The SM6S33ATHE3/I achieves this with minimal voltage overshoot due to its optimized junction passivation.
Is the SM6S33ATHE3/I suitable for new automotive designs?
No - Vishay explicitly marks SM6S33ATHE3/I as "Not For New Designs," recommending SM6S33AHM3 instead. The SM6S33ATHE3/I remains fully supported for existing production and legacy program continuity, but new designs should adopt the HM3 variant for improved halogen-free compliance and mechanical robustness. The SM6S33ATHE3/I retains full AEC-Q101 qualification and identical electrical specs.
How is polarity configured on the SM6S33ATHE3/I DO-218AC package?
The SM6S33ATHE3/I uses unidirectional polarity with the metal heatsink serving as the anode terminal and lead 1 as the cathode. This configuration requires the heatsink to be connected to the system reference (typically battery ground or chassis) while the cathode connects to the protected line. Incorrect orientation will prevent proper clamping and may cause catastrophic failure.
What is the thermal resistance junction-to-case (RθJC) for the SM6S33ATHE3/I?
The SM6S33ATHE3/I has a typical thermal resistance of 0.95 °C/W from junction to case (RθJC). This low value results from its DO-218AC package's integrated metal heatsink, enabling efficient heat transfer directly into the PCB copper. Engineers must design ≥250 mm² of 2-oz copper connected to the anode pad to maintain rated 4600 W surge capability at TC = 25 °C.
Does the SM6S33ATHE3/I meet ISO 7637-2 requirements?
Yes - the SM6S33ATHE3/I is specified to meet ISO 7637-2 surge requirements, though compliance depends on test condition (pulse shape, duration, source impedance). It is validated for load dump (Pulse 5a/5b) and inductive switching (Pulse 1/2a/3a/3b) waveforms when properly mounted with adequate PCB copper area. Full test reports are available upon request from Vishay.
SM6S33ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AC
SM6S33ATHE3/I FAQ
1.How can I place an order for SM6S33ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S33ATHE3/I 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 SM6S33ATHE3/I reliable?
The price and inventory of SM6S33ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S33ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM6S33ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S33ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S33ATHE3/I?
SM6S33ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S33ATHE3/I 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 SM6S33ATHE3/I?
For technical support, including SM6S33ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S33ATHE3/I requirements.
6.How does Aetrix verify that SM6S33ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM6S33ATHE3/I 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 SM6S33ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM6S33ATHE3/I?
All SM6S33ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S33ATHE3/I, 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 SM6S33ATHE3/I part is unused and in its original packaging.
Return procedure for SM6S33ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S33ATHE3/I Tags
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