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Vishay General Semiconductor - Diodes Division SM8S33AHE3/2D
- Part No.:
- SM8S33AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S33AHE3/2D.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,572
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Product details
Overview
SM8S33AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) 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 124 A peak pulse current (10/1000 μs), and 6600 W peak pulse power capability.
For engineers reviewing the SM8S33AHE3/2D datasheet, SM8S33AHE3/2D pinout, SM8S33AHE3/2D application, or SM8S33AHE3/2D equivalent, key selection criteria include its AEC-Q101 qualification, DO-218AB package with heatsink-anode polarity, 175 °C junction rating, and compliance with ISO 7637-2 load dump surge requirements.
Technical Context
This TVS diode operates exclusively in unidirectional mode with the metal heatsink serving as the anode terminal. Its junction passivation and anisotropic rectifier technology enable stable performance up to TJ = 175 °C and low leakage (<10 μA at VWM, <150 μA at TJ = 175 °C).
The device delivers 6600 W peak pulse power (10/1000 μs) and 5200 W (10/10 000 μs), with thermal resistance RθJC = 0.90 °C/W enabling high-power transient absorption on properly heatsinked PCBs. It meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 24 V automotive circuits. |
| VBR (min/max) | 36.7 V / 40.6 V - Breakdown occurs within this range at 5 mA test current; ensures predictable turn-on during transients. |
| VC @ IPPM | 53.3 V at 124 A - Clamped voltage under 10/1000 μs surge; limits downstream IC stress during load dump events. |
| PPPM (10/1000 μs) | 6600 W - Peak transient energy handling capacity; supports ISO 7637-2 Pulse 5a/b without failure. |
| TJ max | 175 °C - Maximum junction temperature rating; enables operation in under-hood environments without derating. |
| IFSM | 700 A - Non-repetitive forward surge current (8.3 ms half-sine); withstands high-current inrush during fault conditions. |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation in series with protected line. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with integral metal heatsink acting as anode terminal. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 reliability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Transient current sink | Connected to protected line (e.g., battery rail); carries full surge current during clamping. |
| Lead 2 / Metal Heatsink (anode) | Current return path & thermal interface | Must be soldered to large copper pour or heatsink; serves as primary thermal conduction path and circuit reference. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability across temperature, humidity, and mechanical stress tests per AEC standard. |
| Junction passivation optimized design | Reduces leakage drift and improves long-term stability at 175 °C, critical for engine compartment applications. |
| Meets ISO 7637-2 | Withstands standardized automotive load dump pulses (Pulse 5a/b) without degradation or parametric shift. |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required pre-assembly. |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, eliminating risk of latent short-circuit failures. |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting ECUs, body control modules, and infotainment systems from alternator-induced load dump transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ground, clamping surges above 33 V. Use Value: Limits peak voltage to ≤53.3 V during 6600 W transients, preventing damage to downstream 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding power distribution networks in ADAS cameras, radar modules, and telematics units exposed to harsh electrical environments. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main supply input, activated within nanoseconds of transient onset. Use Value: Maintains system uptime by absorbing ISO 7637-2 Pulse 5a (12 V system) and Pulse 5b (24 V system) without latch-up or degradation. |
| Engine Control Unit (ECU) Input Protection | Start-Stop System Voltage Regulation |
Use Scenario: Shielding microcontroller I/O and sensor interfaces in gasoline/diesel engine management systems subject to repeated load dump events. IC Role / Device Role / Timing Role: Front-end transient suppressor on power input and CAN bus lines, leveraging DO-218AB thermal mass. Use Value: Enables reliable operation at TJ = 175 °C ambient, supporting extended under-hood deployment without thermal derating. |
Use Scenario: Stabilizing voltage rails during aggressive start-stop cycles where battery voltage can spike to >35 V during alternator recharge. IC Role / Device Role / Timing Role: Fast-response clamp that activates before LDOs or buck regulators reach overvoltage trip thresholds. Use Value: Prevents false resets and brownouts in safety-critical modules by holding rail voltage below 53.3 V for ≥100 ms duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33A | Same VWM (33 V), but lower PPPM (400 W vs. 6600 W); DO-214AC package; RθJC ≈ 50 °C/W vs. 0.90 °C/W. | Not suitable for load dump; limited to ESD and low-energy transients; requires external heatsinking for >100 W surges. | Select only for non-automotive, low-power signal-line protection where thermal mass is not required. |
| ON Semiconductor SMCJ33A | Same VWM (33 V), PPPM = 1500 W (10/1000 μs); DO-214AB package; RθJC = 2.2 °C/W; AEC-Q101 qualified. | Supports moderate surges (e.g., ISO 16750-2), but insufficient for full ISO 7637-2 Pulse 5; lower thermal efficiency. | Choose when cost is prioritized over peak surge margin and board space allows larger thermal pad area. |
Compared with SMAJ33A and SMCJ33A, the SM8S33AHE3/2D delivers 4.4× and 4.4× higher peak pulse power respectively, with 55× and 2.4× better thermal resistance-enabling direct integration into high-reliability automotive power rails without supplemental heatsinks.
Availability
SM8S33AHE3/2D is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and start-stop system designs requiring stable component supply, AEC-Q101 compliance, and high-temperature operational integrity.
Supply support for SM8S33AHE3/2D 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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM8SxxA family was engineered specifically for automotive load dump suppression, combining ultra-high surge capability, AEC-Q101 qualification, and DO-218AB thermal performance to replace legacy axial and SMC-packaged TVS solutions.
FAQ
What is the maximum clamping voltage of the SM8S33AHE3/2D under a 10/1000 μs surge?
The SM8S33AHE3/2D has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 124 A using the 10/1000 μs waveform. This value is measured per the conditions specified in the Vishay datasheet (Document Number: 88387, Rev. 31-Aug-16) and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM8S33AHE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM8S33AHE3/2D suitable for 24 V automotive systems?
Yes, the SM8S33AHE3/2D is explicitly designed for 24 V automotive systems, with a 33.0 V stand-off voltage (VWM) and 36.7–40.6 V breakdown range that aligns with ISO 7637-2 Pulse 5b requirements. Its 6600 W peak pulse power rating and AEC-Q101 qualification confirm suitability for under-hood applications in trucks, buses, and off-road vehicles where sustained 24 V nominal operation and high-energy load dump events occur. The SM8S33AHE3/2D is referenced in Vishay's application guidance for 24 V load dump protection.
How is polarity configured on the SM8S33AHE3/2D DO-218AB package?
The SM8S33AHE3/2D uses unidirectional polarity with the metal heatsink serving as the anode terminal and Lead 1 as the cathode. This configuration is fixed and non-reversible: the heatsink must be connected to system ground or the lower-potential node, while Lead 1 connects to the line being protected. Incorrect orientation will prevent clamping action and may cause catastrophic failure. Polarity is confirmed in the "Mechanical Data" section of the Vishay datasheet (88387), which states "Polarity: heatsink is anode."
Does the SM8S33AHE3/2D require external heatsinking?
The SM8S33AHE3/2D integrates a metal heatsink as part of the DO-218AB package and achieves RθJC = 0.90 °C/W, meaning it conducts heat directly from the junction to the heatsink. While no *external* heatsink is mandatory, optimal thermal performance requires soldering the metal heatsink (Lead 2) to a minimum 100 mm² copper pour on the PCB. Without adequate copper area, power derating is necessary per Figure 1 in the Vishay datasheet. The SM8S33AHE3/2D is engineered to operate at TJ = 175 °C with proper PCB layout-not with added heatsinks.
What is the leakage current specification for the SM8S33AHE3/2D at maximum operating temperature?
At TJ = 175 °C and VWM = 33.0 V, the SM8S33AHE3/2D exhibits a maximum reverse leakage current (ID) of 150 μA, as specified in the "Electrical Characteristics" table of the Vishay datasheet (88387). This value is significantly higher than the 10 μA maximum at 25 °C, reflecting expected thermal-driven leakage increase-but remains well within design margins for automotive power rail monitoring and protection. The SM8S33AHE3/2D maintains stable leakage behavior across its full temperature range without parametric drift.
SM8S33AHE3/2D 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):
- 124A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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-218AB
SM8S33AHE3/2D FAQ
1.How can I place an order for SM8S33AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S33AHE3/2D 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 SM8S33AHE3/2D reliable?
The price and inventory of SM8S33AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S33AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S33AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S33AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S33AHE3/2D?
SM8S33AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S33AHE3/2D 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 SM8S33AHE3/2D?
For technical support, including SM8S33AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S33AHE3/2D requirements.
6.How does Aetrix verify that SM8S33AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S33AHE3/2D 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 SM8S33AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S33AHE3/2D?
All SM8S33AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S33AHE3/2D, 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 SM8S33AHE3/2D part is unused and in its original packaging.
Return procedure for SM8S33AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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