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Vishay General Semiconductor - Diodes Division SM8S33AHE3S/2D
- Part No.:
- SM8S33AHE3S/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S33AHE3S/2D.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,038
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Product details
Overview
SM8S33AHE3S/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 voltage (VBR), 53.3 V clamping voltage at 124 A peak pulse current (10/1000 μs), and 6600 W peak pulse power capability - all rated at TJ = 175 °C for under-hood reliability.
For engineers reviewing the SM8S33AHE3S/2D datasheet, SM8S33AHE3S/2D pinout, SM8S33AHE3S/2D application, or SM8S33AHE3S/2D equivalent, key selection criteria include its DO-218AB package thermal resistance (RθJC = 0.90 °C/W), AEC-Q101 qualification, ISO7637-2 compliance, and unidirectional polarity with heatsink-as-anode configuration.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive electronics, activating above its breakdown threshold to shunt high-energy transients-such as automotive load dump pulses-to ground. Its junction passivation and anisotropic rectifier technology ensure stable leakage (<10 μA at VWM) and low forward voltage drop (VF ≤ 1.8 V at 100 A).
The device is optimized for high-reliability automotive environments: it sustains continuous operation up to TJ = 175 °C, meets MSL Level 1 reflow (245 °C peak), and delivers 700 A non-repetitive surge current (IFSM, 8.3 ms half-sine). Its DO-218AB package enables direct thermal coupling to PCB copper or external heatsinks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum reverse operating voltage before clamping begins; defines safe DC operating margin in 24 V automotive systems. |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 5.0 mA - Confirmed breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 53.3 V at 124 A (10/1000 μs) - Clamping voltage limits downstream IC stress during ISO7637-2 load dump events. |
| PPPM | 6600 W (10/1000 μs) - Enables single-pulse suppression of high-energy transients without failure. |
| TJ max | 175 °C - Supports under-hood placement without derating in engine control units and body controllers. |
| RθJC | 0.90 °C/W - Enables efficient heat transfer to heatsink or copper pour, critical for sustained surge handling. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive-grade discrete semiconductors including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with metal heatsink acting as anode terminal. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| 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 path and electrical return; must be connected to system ground plane or heatsink for RθJC performance. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation + anisotropic rectifier | Enables stable leakage (<10 μA at VWM, TJ = 175 °C) and repeatable VBR over lifetime and temperature. |
| DO-218AB package with metal heatsink | Provides 0.90 °C/W thermal resistance and supports >700 A IFSM surge without bond wire failure. |
| AEC-Q101 qualification | Validates robustness for automotive applications including temperature cycling, humidity bias, and high-temperature reverse bias. |
| ISO7637-2 compliance | Guarantees survivability against standardized 12 V/24 V vehicle load dump waveforms (e.g., Pulse 5a/b). |
| MSL Level 1 rating | Permits single-reflow assembly at 245 °C peak without popcorn or delamination risk. |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protects microcontroller power rails and CAN transceivers from alternator load dump surges during battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 24 V supply and ground, activated within nanoseconds of overvoltage onset. Use Value: Limits clamped voltage to 53.3 V, ensuring downstream 60 V-rated regulators and interface ICs remain within absolute maximum ratings. |
Use Scenario: Shields BCM power input from transients induced by relay switching of lighting, HVAC, and window motors. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on main 12 V input rail, upstream of DC/DC converters and LDOs. Use Value: Absorbs 6600 W peak pulse energy without degradation, maintaining system uptime in harsh duty cycles. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) ECU |
Use Scenario: Safeguards image sensor and SerDes power supplies in rear-view and surround-view cameras exposed to vehicle-level surges. IC Role / Device Role / Timing Role: Fast-response clamping device with <1 ns response time, placed adjacent to camera module input connector. Use Value: Maintains <10 μA leakage at 33 V, preventing quiescent current increase that would compromise parking mode battery life. |
Use Scenario: Protects motor driver gate drivers and position sensor interfaces from inductive kickback during EPS motor commutation. IC Role / Device Role / Timing Role: High-current TVS integrated into power stage PCB layout with direct heatsink connection via metal tab. Use Value: Sustains 175 °C junction temperature during continuous operation, eliminating thermal shutdown in stop-and-go driving conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection 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 ≈ 35 °C/W. | Rated for lower-energy transients only; not suitable for ISO7637-2 load dump; limited to infotainment or low-power modules. | Select SMAJ33A only if system-level surge energy is confirmed <100 mJ and thermal management is constrained. |
| ON Semiconductor 1.5SMC33A | Same VWM (33 V), PPPM = 1500 W; DO-214AB package; RθJC ≈ 15 °C/W; AEC-Q101 not claimed. | Meets basic IEC61000-4-5 but lacks ISO7637-2 validation and high-temperature derating data for automotive under-hood use. | Choose 1.5SMC33A for cost-sensitive industrial controls where AEC-Q101 and 175 °C operation are not required. |
Compared with SMAJ33A and 1.5SMC33A, SM8S33AHE3S/2D delivers 4.4× and 4.4× higher peak pulse power respectively, with verified 175 °C operation and ISO7637-2 compliance-making it the only option qualified for primary load dump protection in engine bay ECUs.
Availability
SM8S33AHE3S/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across extended temperature and high-surge environments.
Supply support for SM8S33AHE3S/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, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM8SxxA series is part of Vishay's PAR® (Protection Against Transients) platform, engineered specifically for automotive-grade transient suppression with emphasis on high-temperature stability, AEC-Q101 compliance, and ISO7637-2 load dump immunity.
FAQ
What is the clamping voltage of SM8S33AHE3S/2D at its rated peak pulse current?
The SM8S33AHE3S/2D has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 124 A under the standard 10/1000 μs waveform. This value is measured at TC = 25 °C and guarantees predictable overvoltage limiting for downstream 60 V-rated components in automotive power rails.
Is SM8S33AHE3S/2D qualified for automotive applications?
Yes, SM8S33AHE3S/2D is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO7637-2 load dump requirements, operates reliably up to TJ = 175 °C, and passes MSL Level 1 reflow (245 °C peak), making it suitable for engine control units, body controllers, and ADAS modules.
What does the "HE3S/2D" suffix indicate in SM8S33AHE3S/2D?
The "HE3S" suffix denotes RoHS-compliant, matte tin-plated leads meeting JESD201 Class 2 whisker resistance and J-STD-002 solderability. The "/2D" indicates packaging in 13-inch plastic tape and reel with 750 units per reel and anode orientation toward the sprocket hole - critical for automated placement alignment.
How does the DO-218AB package of SM8S33AHE3S/2D improve thermal performance?
The DO-218AB package uses a large metal heatsink as the anode terminal, achieving a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W. This allows efficient heat transfer to PCB copper pours or external heatsinks, sustaining high surge currents without thermal runaway - a key advantage over smaller DO-214 packages.
Can SM8S33AHE3S/2D replace SM8S33AHE3/2D?
Yes, SM8S33AHE3S/2D is a direct replacement for SM8S33AHE3/2D. The "S" suffix indicates the same RoHS-compliant, AEC-Q101-qualified construction with identical electrical specs, thermal performance, and packaging - the change reflects Vishay's updated internal manufacturing code and does not affect form, fit, or function.
SM8S33AHE3S/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
SM8S33AHE3S/2D FAQ
1.How can I place an order for SM8S33AHE3S/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S33AHE3S/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 SM8S33AHE3S/2D reliable?
The price and inventory of SM8S33AHE3S/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S33AHE3S/2D is usually 5 days.
3.What payment methods are accepted for SM8S33AHE3S/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S33AHE3S/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S33AHE3S/2D?
SM8S33AHE3S/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S33AHE3S/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 SM8S33AHE3S/2D?
For technical support, including SM8S33AHE3S/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S33AHE3S/2D requirements.
6.How does Aetrix verify that SM8S33AHE3S/2D is sourced from the original manufacturer or authorized distributors?
All SM8S33AHE3S/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 SM8S33AHE3S/2D meets industry standards.
7.What is the process for return or replacement of SM8S33AHE3S/2D?
All SM8S33AHE3S/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S33AHE3S/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 SM8S33AHE3S/2D part is unused and in its original packaging.
Return procedure for SM8S33AHE3S/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S33AHE3S/2D Tags
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