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Vishay General Semiconductor - Diodes Division SM5S33A-E3/2D
- Part No.:
- SM5S33A-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S33A-E3/2D.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM5S33A-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AB package, rated for 33 V stand-off voltage, 53.3 V clamping voltage at 68 A peak pulse current (10/1000 µs), and 3600 W peak pulse power. It operates up to 175 °C junction temperature and is AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM5S33A-E3/2D datasheet, SM5S33A-E3/2D pinout, SM5S33A-E3/2D application, or SM5S33A-E3/2D equivalent, key selection criteria include unidirectional polarity, 33 V VWM, low leakage (<10 µA at VWM), DO-218AB thermal performance (RθJC = 1.0 °C/W), and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve high reliability under repetitive surge stress and elevated temperature operation. Its unidirectional configuration provides forward conduction path with low VF (≤2.0 V at 100 A) and reverse clamping action during overvoltage events.
The DO-218AB case features a metal heatsink terminal (anode) and optimized thermal path for high-power dissipation-enabling 5 W steady-state power on infinite heatsink and 2800 W capability under 10/10,000 µs waveform-while meeting MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VC @ IPPM | 53.3 V - Clamped voltage at 68 A peak pulse current (10/1000 µs), defining worst-case voltage seen by protected circuit |
| PPPM (10/1000 µs) | 3600 W - Peak surge power handling capacity for standard lightning/surge waveform |
| TJ max. | 175 °C - Enables use in under-hood automotive environments without derating penalties |
| IFSM | 500 A - Single half-sine surge current rating (8.3 ms), supporting high-energy load dump events |
| RθJC | 1.0 °C/W - Low thermal resistance from junction to case enables efficient heat transfer to PCB/heatsink |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended metal heatsink case with anode-connected heatsink terminal and cathode lead. Dimensions: 15.4 × 9.5 × 3.8 mm (L × W × H). UL 94 V-0 molding compound; matte tin-plated leads compliant with J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Primary current path during forward conduction and thermal interface | Electrically connected to metal case; must be soldered to large copper area for thermal management and electrical return |
| Cathode (Lead 1) | Reverse-biased terminal during clamping; connects to protected line | Connected to the signal/power line requiring transient suppression; carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Passivated anisotropic rectifier technology | Enables stable breakdown characteristics and low leakage (<10 µA at VWM) across temperature and lifetime |
| DO-218AB metal heatsink construction | Provides 1.0 °C/W thermal resistance and supports 5 W continuous power dissipation on infinite heatsink |
| ISO7637-2 compliance | Validated for automotive load dump and switching transient immunity per test pulses 1, 2a, 3a/b, and 5a |
| AEC-Q101 qualification | Includes HTGB, AC/HTRB, TC, UHAST, and mechanical stress testing per automotive reliability standards |
| MSL Level 1 (245 °C peak) | Allows standard SMT reflow without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Load Dump Protection | DC Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs), body control modules (BCMs), and infotainment systems from 12 V/24 V battery system load dump transients (up to ±120 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and ground, clamping surges above 33 V while maintaining low leakage during normal operation. Use Value: Limits voltage to ≤53.3 V during 68 A transients, preventing damage to downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding industrial DC power supplies (e.g., 24 V PLC I/O modules) against inductive switching spikes from solenoids, relays, and motors. IC Role / Device Role / Timing Role: Standoff device absorbing energy from fast-rising transients (tr < 10 µs) on +24 V distribution lines before they reach sensitive analog front-ends or communication ICs. Use Value: Withstands 3600 W peak pulses and maintains <10 µA leakage at 33 V, ensuring minimal standby power loss and reliable long-term operation. |
| Automotive Lighting Transient Suppression | High-Temperature Sensor Interface Protection |
Use Scenario: Shielding LED headlamp drivers and CAN/LIN bus transceivers from voltage spikes generated by HID ballast switching and lamp filament inrush. IC Role / Device Role / Timing Role: Unidirectional clamp on supply input of lighting control ICs, leveraging DO-218AB thermal mass to absorb repeated 10/1000 µs surges without degradation. Use Value: Operates reliably at 175 °C junction temperature, enabling placement near hot LED drivers without derating or thermal shutdown. | Use Scenario: Protecting temperature, pressure, and position sensors mounted in high-temperature zones (e.g., exhaust manifolds, turbochargers) from ESD and cable discharge events. IC Role / Device Role / Timing Role: First-line defense at sensor harness entry point, shunting transients before they propagate into precision amplifier or ADC input stages. Use Value: Low clamping voltage (53.3 V) prevents latch-up in 5 V or 3.3 V sensor signal chains, while AEC-Q101 qualification ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPPM (400 W vs. 3600 W); SMA package (RθJC ≈ 40 °C/W); VC = 53.3 V at 7.5 A | Not suitable for automotive load dump; limited to low-energy ESD and inductive spikes | Select SMAJ33A only for space-constrained consumer electronics where surge energy is <100 mJ |
| SMCJ33A | Same DO-214AB package; lower PPPM (1500 W); VC = 53.3 V at 28.3 A; RθJC = 2.2 °C/W | Acceptable for non-critical 12 V automotive subsystems but fails ISO7637-2 Pulse 5a validation | Choose SMCJ33A when cost is prioritized over full AEC-Q101 compliance and load dump margin |
Compared with SMAJ33A and SMCJ33A, the SM5S33A-E3/2D delivers 2.4× higher surge power than SMCJ33A and 9× higher than SMAJ33A within the same 33 V VWM class, enabled by its DO-218AB thermal architecture and AEC-Q101 stress validation-making it the only option qualified for under-hood load dump protection.
Availability
SM5S33A-E3/2D is available at Aetrix Electronics and suitable for automotive ECUs, industrial 24 V power supplies, LED lighting drivers, and high-temperature sensor interfaces requiring stable component supply, long-lifecycle support, and AEC-Q101 assurance.
Supply support for SM5S33A-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 reliability, thermal performance, and automotive-grade qualification.
The SM5SxxA series is part of Vishay's PAR® TVS platform designed specifically for high-energy automotive transients-including load dump, jump start, and ISO7637-2 pulses-with focus on thermal robustness, AEC-Q101 compliance, and DO-218AB package scalability.
FAQ
What is the clamping voltage of the SM5S33A-E3/2D at its rated peak pulse current?
The SM5S33A-E3/2D has a maximum clamping voltage (VC) of 53.3 V at 68 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuits during surge events. The SM5S33A-E3/2D maintains this clamping performance across its full operating temperature range (–55 °C to +175 °C), making it suitable for under-hood automotive applications where thermal stability is critical.
Is the SM5S33A-E3/2D suitable for bidirectional transient protection?
No, the SM5S33A-E3/2D is a unidirectional TVS diode and is not rated for bidirectional operation. Its polarity is fixed with the metal heatsink serving as the anode terminal, and it conducts only in forward bias during overvoltage events on the cathode side. For bidirectional protection, a separate symmetric device such as the SMBJ33CA would be required-but that part lacks AEC-Q101 qualification and DO-218AB thermal capability. The SM5S33A-E3/2D is engineered exclusively for unidirectional automotive load dump and power rail suppression.
Does the SM5S33A-E3/2D meet ISO7637-2 requirements for automotive applications?
Yes, the SM5S33A-E3/2D meets ISO7637-2 surge specifications for automotive electronics, including Pulse 1 (inductive load disconnect), Pulse 2a (power supply interruption), Pulse 3a/b (capacitive coupling), and Pulse 5a (load dump). This compliance is validated through standardized testing per the specification and supported by its AEC-Q101 qualification. The SM5S33A-E3/2D's 3600 W peak pulse power and 175 °C junction rating ensure robust performance across all relevant test conditions.
What is the thermal resistance from junction to case (RθJC) for the SM5S33A-E3/2D?
The SM5S33A-E3/2D has a typical thermal resistance from junction to case (RθJC) of 1.0 °C/W, as specified in the Vishay datasheet (Document Number: 88382). This low value results from its DO-218AB metal heatsink construction and direct thermal path from die to case. When mounted on a properly sized copper pad, the SM5S33A-E3/2D can dissipate 5 W continuously-critical for sustained surge duty cycles in automotive and industrial environments.
How does the SM5S33A-E3/2D differ from the SM5S33 (non-A) variant?
The SM5S33A-E3/2D features tighter parameter tolerances than the SM5S33: its breakdown voltage (VBR) range is 36.7 V to 40.6 V (min/max) versus 36.7 V to 44.9 V for SM5S33, and its clamping voltage is lower (53.3 V vs. 59.0 V at rated IPPM). The "A" suffix indicates enhanced consistency for automotive applications where predictable clamping behavior is essential. Both share identical packaging, AEC-Q101 qualification, and DO-218AB thermal performance-but the SM5S33A-E3/2D offers superior design margin for voltage-sensitive systems.
SM5S33A-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):
- 68A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S33A-E3/2D FAQ
1.How can I place an order for SM5S33A-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S33A-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 SM5S33A-E3/2D reliable?
The price and inventory of SM5S33A-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 SM5S33A-E3/2D is usually 5 days.
3.What payment methods are accepted for SM5S33A-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S33A-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S33A-E3/2D?
SM5S33A-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S33A-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 SM5S33A-E3/2D?
For technical support, including SM5S33A-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S33A-E3/2D requirements.
6.How does Aetrix verify that SM5S33A-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S33A-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 SM5S33A-E3/2D meets industry standards.
7.What is the process for return or replacement of SM5S33A-E3/2D?
All SM5S33A-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S33A-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 SM5S33A-E3/2D part is unused and in its original packaging.
Return procedure for SM5S33A-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S33A-E3/2D Tags
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