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Vishay General Semiconductor - Diodes Division SM5S33AHE3_A/I
- Part No.:
- SM5S33AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S33AHE3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
SM5S33AHE3_A/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), 38.7 V nominal breakdown voltage (VBR), 53.3 V clamping voltage at 150 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the SM5S33AHE3_A/I datasheet, SM5S33AHE3_A/I pinout, SM5S33AHE3_A/I application, or SM5S33AHE3_A/I equivalent, key selection criteria include its DO-218AB package thermal performance (RθJM = 0.45 °C/W), 175 °C junction rating, low leakage (<10 μA at VWM), and compliance with ISO7637-2 surge testing - critical for 12 V/24 V vehicle electrical system robustness.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping behavior across -55 °C to +175 °C operating range. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to metal chassis for enhanced thermal dissipation in high-power transients.
The device is optimized for single-pulse load dump events (e.g., alternator disconnection), with validated 10 ms exponential waveform capability up to 2500 W at TJ = 125 °C. Its 0.091 %/°C VBR temperature coefficient ensures predictable voltage margin shift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before conduction begins; sets safe operating margin below system nominal 24 V rail. |
| VBR (nom) | 38.7 V - Breakdown voltage at 5 mA test current; defines onset of avalanche clamping during overvoltage events. |
| VC @ IPPM | 53.3 V - Clamping voltage at 150 A peak pulse current (10/1000 μs); limits downstream IC stress during load dump surges. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling; supports high-energy transients without failure in automotive environments. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near heat sources (e.g., engine control units) without derating. |
| Leakage @ VWM | <10 μA - Low reverse leakage preserves battery life in always-on vehicle modules. |
| Package | DO-218AB - Thermally efficient surface-mount package with metal heatsink terminal; RθJM = 0.45 °C/W enables direct PCB copper pour attachment. |
Pinout & Package
DO-218AB package with two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). The heatsink serves as the anode connection and provides primary thermal path to PCB copper or chassis.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into the device during clamping. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal and electrical return path; must be soldered to large copper area or chassis for effective heat dissipation and low-inductance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
| Junction passivation | Reduces surface leakage and improves long-term stability under high-humidity, high-temperature automotive conditions. |
| ISO7637-2 compliant | Meets Pulse 5a (load dump) requirements for 12 V systems up to 35 V initial battery voltage and 10 ms duration. |
| RoHS-compliant & halogen-free (E3) | Meets automotive environmental regulations with matte tin-plated leads and UL 94 V-0 molding compound. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection against alternator load dump transients during ignition-off events in gasoline/diesel powertrain ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO/regulator input to limit voltage excursion to ≤53.3 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers rated for 40 V absolute maximum. |
Use Scenario: Surge suppression on 12 V supply rail feeding door module actuators, lighting drivers, and LIN bus interfaces. IC Role / Device Role / Timing Role: Primary overvoltage protector upstream of DC-DC converters and power management ICs. Use Value: Maintains system uptime by absorbing 3600 W pulses without degradation, enabling >100,000 cycle lifetime in production vehicles. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Input | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Input protection for 12 V–5 V buck converter powering CMOS image sensors and ISP processors in forward-facing cameras. IC Role / Device Role / Timing Role: Fast-response clamping device with <1 ns response time to suppress ESD and load dump-induced spikes. Use Value: Ensures uninterrupted video stream by preventing reset or corruption during roadside electromagnetic disturbances. |
Use Scenario: Protection of H-bridge gate driver ICs and current sense amplifiers from inductive kickback during EPS motor commutation. IC Role / Device Role / Timing Role: High-surge-capability TVS placed at main 12 V input to motor driver board. Use Value: Withstands repetitive 500 A IFSM surges and maintains clamping performance after 1000+ load dump events per ISO16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S33AHM3_A/I | Same electrical specs; HM3 suffix indicates enhanced MSL level 1 qualification with extended reflow profile tolerance (up to 260 °C). | Preferred for new designs targeting higher reflow process margins or dual-sourcing flexibility. | Select when upgrading from legacy HE3 parts or requiring documented compatibility with JEDEC J-STD-020 Class 3A reflow. |
| SMAJ33A | Lower PPPM (400 W), smaller SMA package (RθJA ≈ 65 °C/W), no AEC-Q101 qualification. | Limited to non-automotive industrial or consumer applications with lower surge energy requirements. | Use only for cost-sensitive, non-automotive designs where 3600 W surge immunity is not required. |
Compared with SM5S33AHE3_A/I, SM5S33AHM3_A/I offers identical protection performance with improved manufacturability for high-reliability SMT lines, while SMAJ33A sacrifices surge capacity and automotive qualification for footprint and cost reduction - making it unsuitable for load dump duty cycles.
Availability
SM5S33AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU protection, body electronics surge suppression, and ADAS camera power conditioning requiring stable component supply across multi-year vehicle production programs.
Supply support for SM5S33AHE3_A/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 SM5SxxA family is engineered specifically for automotive load dump and ISO7637-2 transient suppression, leveraging DO-218AB's metal heatsink for superior thermal management in space-constrained under-hood environments.
FAQ
What is the clamping voltage of SM5S33AHE3_A/I at its rated peak pulse current?
The SM5S33AHE3_A/I has a maximum clamping voltage (VC) of 53.3 V at 150 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The clamping performance remains stable across its full operating temperature range (-55 °C to +175 °C), ensuring consistent protection in automotive environments.
Is SM5S33AHE3_A/I suitable for new automotive designs despite the "Not For New Designs" note in the datasheet?
While the SM5S10A–SM5S36A family carries a "Not For New Designs" notice due to Vishay's introduction of the enhanced HM3 series, SM5S33AHE3_A/I remains fully qualified, in active production, and supported for existing programs. It retains AEC-Q101 qualification, ISO7637-2 compliance, and full traceability - making it appropriate for sustaining engineering, replacement part sourcing, and legacy platform continuity.
How does the DO-218AB package of SM5S33AHE3_A/I improve thermal performance compared to SMA or SMC packages?
The DO-218AB package of SM5S33AHE3_A/I integrates a metal heatsink as the anode terminal, achieving a junction-to-mount thermal resistance (RθJM) of just 0.45 °C/W - over 5× better than typical SMA packages (~2.5 °C/W). This allows direct thermal coupling to PCB copper pours or chassis, enabling sustained power dissipation and reliable operation during repeated load dump events without thermal runaway.
Does SM5S33AHE3_A/I meet RoHS and halogen-free requirements?
Yes, SM5S33AHE3_A/I carries the E3 suffix, confirming it is RoHS-compliant, halogen-free, and features matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. The molding compound also complies with UL 94 V-0 flammability requirements, satisfying automotive material compliance mandates per Vishay document 99912.
What is the maximum reverse leakage current of SM5S33AHE3_A/I at 33 V and 175 °C?
At VWM = 33 V and TJ = 175 °C, the SM5S33AHE3_A/I exhibits a maximum reverse leakage current (ID) of 10 μA. This low leakage preserves standby power integrity in always-on vehicle modules such as telematics and alarm systems, and is verified per the manufacturer's electrical characteristics table in Document Number 88382.
SM5S33AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 68A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S33AHE3_A/I FAQ
1.How can I place an order for SM5S33AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S33AHE3_A/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 SM5S33AHE3_A/I reliable?
The price and inventory of SM5S33AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S33AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM5S33AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S33AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S33AHE3_A/I?
SM5S33AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S33AHE3_A/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 SM5S33AHE3_A/I?
For technical support, including SM5S33AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S33AHE3_A/I requirements.
6.How does Aetrix verify that SM5S33AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM5S33AHE3_A/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 SM5S33AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM5S33AHE3_A/I?
All SM5S33AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S33AHE3_A/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 SM5S33AHE3_A/I part is unused and in its original packaging.
Return procedure for SM5S33AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S33AHE3_A/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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