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Vishay General Semiconductor - Diodes Division SM8S33A-001HE3/2D
- Part No.:
- SM8S33A-001HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S33A-001HE3/2D.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,649
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Product details
Overview
SM8S33A-001HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 33.0 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 53.3 V clamping voltage at 124 A peak pulse current, 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S33A-001HE3/2D datasheet, SM8S33A-001HE3/2D pinout, SM8S33A-001HE3/2D application, or SM8S33A-001HE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 0.90 °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 to shunt high-energy transients-especially 12 V automotive load dump surges-away from downstream circuitry. Its passivated anisotropic rectifier technology enables stable operation up to TJ = 175 °C and low forward voltage drop (VF ≤ 1.8 V at 100 A).
The device is optimized for high-reliability automotive environments: it meets MSL Level 1 (245 °C reflow), passes JESD201 Class 2 whisker testing, and delivers 5200 W surge capability under the longer 10/10,000 μs waveform-critical for sustained load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 36.7 V / 40.6 V - Breakdown occurs within this range at 5 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 53.3 V at 124 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on protected ICs. |
| PPPM (10/1000 μs) | 6600 W - Peak transient energy handling capacity; supports severe automotive load dump events. |
| TJ max | 175 °C - Maximum junction temperature; enables under-hood placement without derating penalties. |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation in series with protected line. |
| RθJC | 0.90 °C/W - Low thermal resistance from junction to case; enables efficient heat transfer to PCB copper or external heatsink. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with metal heatsink tab (Lead 2). Molding compound meets UL 94 V-0; matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards. HE3 suffix indicates RoHS-compliant, AEC-Q101 qualified construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery rail); carries transient current into device during clamping. |
| Lead 2 / Metal Heatsink | Anode | Must be connected to system ground or low-impedance return path; serves as primary thermal conduction path and electrical reference. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable VBR and low leakage over lifetime and temperature. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock per AEC standard. |
| ISO7637-2 compliance | Meets Pulse 5a/b load dump requirements when properly mounted on adequate copper area. |
| MSL Level 1 rating | Supports lead-free reflow up to 245 °C peak without popcorn or delamination risk. |
| Low clamping ratio | VC/VWM = 53.3/33.0 ≈ 1.62 - Tight clamping margin preserves headroom for downstream 3.3 V/5 V ICs. |
Applications
| Automotive Load Dump Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs), body control modules (BCMs), and infotainment systems from 12 V battery line transients during alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed in parallel with input filter capacitor, clamping surge voltage before it reaches DC-DC converters or microcontrollers. Use Value: Limits peak voltage to 53.3 V during 6600 W surges, preventing latch-up or permanent damage to 36 V-rated input stages. | Use Scenario: Safeguarding industrial 12 V power distribution boards exposed to relay switching, motor commutation, and ESD coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main supply rail, coordinated with upstream fuses and downstream LC filters. Use Value: Withstands 700 A non-repetitive forward surge (IFSM), enabling robust protection against repetitive inductive kickback. |
| Under-Hood Electronics Protection | High-Temperature Power Interface |
Use Scenario: Shielding sensors, actuators, and CAN transceivers mounted near engines or exhaust systems where ambient temperatures exceed 125 °C. IC Role / Device Role / Timing Role: High-temperature-stable TVS providing continuous protection without parameter drift up to 175 °C junction temperature. Use Value: Maintains <10 μA reverse leakage at VWM even at TJ = 175 °C, avoiding excessive standby current in always-on circuits. | Use Scenario: Securing power inputs of telematics control units (TCUs) and ADAS domain controllers requiring long-term reliability in hot-cabinet environments. IC Role / Device Role / Timing Role: Thermally anchored TVS leveraging DO-218AB metal heatsink for direct PCB copper conduction and minimal RθJC. Use Value: 0.90 °C/W junction-to-case thermal resistance enables >8 W steady-state dissipation with modest copper area, reducing need for external heatsinks. |
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-E3/5AT | Lower PPPM (400 W vs. 6600 W); SMA package (RθJC ≈ 50 °C/W); VBR 36.7–40.6 V same range. | Not suitable for load dump; limited to ESD and low-energy transients in consumer/portable gear. | Select only for space-constrained, low-surge applications where thermal mass and peak power are not critical. |
| TPSMD33A | Same DO-218AB package; 6600 W PPPM; VBR 36.7–40.6 V; but not AEC-Q101 qualified and higher ID (50 μA vs. 10 μA at VWM). | Lacks automotive qualification; may require additional validation for under-hood deployment. | Consider for cost-sensitive industrial designs where AEC-Q101 is not mandated and higher leakage is acceptable. |
Compared with SMAJ33A-E3/5AT and TPSMD33A, the SM8S33A-001HE3/2D uniquely combines automotive qualification, ultra-low thermal resistance, and 6600 W surge capacity in a single DO-218AB package-making it the only option among the three validated for ISO7637-2 load dump in production vehicles.
Availability
SM8S33A-001HE3/2D is available at Aetrix Electronics and suitable for automotive ECU protection, 12 V power rail surge suppression, and under-hood sensor interface applications requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SM8S33A-001HE3/2D 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and automotive-grade validation.
The SM8SxxA family is engineered specifically for high-energy transient suppression in 12 V automotive systems, targeting load dump, jump-start, and inductive switching events with guaranteed AEC-Q101 compliance and 175 °C operation.
FAQ
What is the clamping voltage of the SM8S33A-001HE3/2D at its rated peak pulse current?
The SM8S33A-001HE3/2D has a maximum clamping voltage (VC) of 53.3 V when subjected to its peak pulse current (IPPM) of 124 A under the standard 10/1000 μs waveform. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The SM8S33A-001HE3/2D maintains this clamping performance across its full operating temperature range due to its passivated junction design.
Is the SM8S33A-001HE3/2D suitable for bidirectional transient protection?
No, the SM8S33A-001HE3/2D is unidirectional only, with the metal heatsink serving as the anode and Lead 1 as the cathode. It must be oriented correctly in-circuit to protect against positive-going transients on a grounded-line configuration. For bidirectional protection, a separate device such as the SMBJ33CA or a back-to-back SM8S33A-001HE3/2D pair would be required-not the SM8S33A-001HE3/2D alone.
Does the SM8S33A-001HE3/2D meet automotive qualification standards?
Yes, the SM8S33A-001HE3/2D is AEC-Q101 qualified and explicitly listed as such in Vishay's documentation. It undergoes stress testing for high-temperature operating life, temperature cycling, humidity, and mechanical shock per AEC-Q101 Rev D. The "HE3" suffix confirms RoHS compliance and AEC-Q101 qualification, making the SM8S33A-001HE3/2D appropriate for production automotive electronics.
What is the thermal resistance from junction to case for the SM8S33A-001HE3/2D?
The SM8S33A-001HE3/2D has a typical thermal resistance from junction to case (RθJC) of 0.90 °C/W, measured under standard conditions. This low value is enabled by the DO-218AB package's metal heatsink terminal (Lead 2), which provides direct thermal conduction to PCB copper. Proper layout-using ≥100 mm² of 2 oz copper connected to the heatsink pad-is required to realize the full thermal benefit of the SM8S33A-001HE3/2D.
Can the SM8S33A-001HE3/2D be used in non-automotive applications?
Yes, the SM8S33A-001HE3/2D is widely deployed in industrial 12 V systems, telecom power interfaces, and transportation equipment where high-surge, high-temperature, and high-reliability protection is needed. Its 175 °C rating, 6600 W surge capacity, and low leakage make it suitable beyond automotive-though its AEC-Q101 qualification and ISO7637-2 validation were specifically established for automotive use cases like load dump.
SM8S33A-001HE3/2D 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
SM8S33A-001HE3/2D FAQ
1.How can I place an order for SM8S33A-001HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S33A-001HE3/2D 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 SM8S33A-001HE3/2D reliable?
The price and inventory of SM8S33A-001HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S33A-001HE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S33A-001HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S33A-001HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S33A-001HE3/2D?
SM8S33A-001HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S33A-001HE3/2D 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 SM8S33A-001HE3/2D?
For technical support, including SM8S33A-001HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S33A-001HE3/2D requirements.
6.How does Aetrix verify that SM8S33A-001HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S33A-001HE3/2D 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 SM8S33A-001HE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S33A-001HE3/2D?
All SM8S33A-001HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S33A-001HE3/2D, 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 SM8S33A-001HE3/2D part is unused and in its original packaging.
Return procedure for SM8S33A-001HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S33A-001HE3/2D Tags
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