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Vishay General Semiconductor - Diodes Division SM5S20HE3/2D
- Part No.:
- SM5S20HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S20HE3/2D.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,452
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Product details
Overview
SM5S20HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in high-reliability 12 V systems. It features a 20 V stand-off voltage (VWM), 22.2–27.1 V breakdown range (VBR), 35.8 V clamping voltage at 101 A peak pulse current, and 3600 W peak pulse power (10/1000 μs). Its DO-218AB package supports TJ = 175 °C operation and AEC-Q101 qualification.
For engineers reviewing the SM5S20HE3/2D datasheet, SM5S20HE3/2D pinout, SM5S20HE3/2D application, or SM5S20HE3/2D equivalent, key selection criteria include unidirectional polarity, 101 A IPPM rating at 35.8 V VC, thermal resistance of 1.0 °C/W (junction-to-case), compliance with ISO7637-2 load dump waveforms, and RoHS-compliant matte tin-plated leads meeting JESD 201 Class 2 whisker test.
Technical Context
The SM5S20HE3/2D employs passivated anisotropic rectifier technology optimized for junction stability under high-temperature stress. Its unidirectional architecture provides forward conduction during overvoltage events while maintaining low leakage (≤10 μA at VWM) and low forward voltage drop (≤2.0 V at 100 A).
Rated for 175 °C junction temperature and qualified to AEC-Q101, it delivers robust surge immunity against inductive switching transients and automotive load dump pulses. Its DO-218AB package enables direct heatsink mounting via the metal anode tab, supporting efficient thermal dissipation in constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - Maximum continuous reverse operating voltage before clamping begins; defines system nominal bus voltage compatibility (e.g., 12 V automotive). |
| VBR (min/max) | 22.2 V / 27.1 V - Breakdown voltage range at 5 mA test current; ensures reliable turn-on margin above VWM with production tolerance control. |
| VC @ IPPM | 35.8 V - Clamping voltage at 101 A peak pulse current (10/1000 μs); limits downstream IC stress during worst-case transients. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capability; supports ISO7637-2 Pulse 5a load dump energy absorption without failure. |
| TJ max. | 175 °C - Maximum junction temperature rating; enables deployment in engine bay and other high-ambient automotive locations. |
| RθJC | 1.0 °C/W - Junction-to-case thermal resistance; allows accurate thermal design when mounted to heatsink or copper pour. |
| Polarity | Unidirectional - Anode-connected heatsink configuration; requires correct orientation for forward-biased clamping during positive transients. |
Pinout & Package
Package: DO-218AB - Surface-mount, dual-terminal case with integral metal heatsink tab (anode). Dimensions: 15.4 mm × 9.3 mm × 3.0 mm (L × W × H); anode tab occupies full bottom surface for thermal and mechanical anchoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Transient current sink | Connected to protected line (e.g., battery rail); conducts reverse surge current into anode during overvoltage events. |
| Lead 2 / Metal Heatsink (anode) | Current return path & thermal interface | Must be soldered to large copper area or external heatsink; serves as both electrical return and primary thermal conduction path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics per stress test requirements including HTGB, TCT, and HTRB. |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
| ISO7637-2 compliance | Meets Pulse 5a (load dump) waveform requirements for 12 V systems up to 35 V test voltage, enabling direct use in OEM designs. |
| Low leakage at high temperature | ≤10 μA at VWM and TJ = 175 °C - minimizes standby power loss and prevents false triggering in hot environments. |
| Junction passivation | Optimized anisotropic rectifier process reduces parameter drift over lifetime and improves long-term stability under thermal cycling. |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting 12 V battery-fed circuits during alternator load dump events (ISO7637-2 Pulse 5a). IC Role / Device Role: Unidirectional TVS diode clamping positive transients on main power rail upstream of DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤35.8 V at 101 A, preventing damage to downstream PMICs and MCUs rated for 40 V absolute maximum. |
Use Scenario: Safeguarding ECU main power input against inductive switching spikes from fuel injectors and solenoids. IC Role / Device Role: Fast-response transient suppressor placed at board-level power entry point before bulk capacitance and LDO regulators. Use Value: Withstands 500 A IFSM surge and maintains <10 μA leakage at 175 °C, ensuring signal integrity and low quiescent current in harsh under-hood conditions. |
| Body Control Module (BCM) Power Rail | ADAS Camera Power Supply |
Use Scenario: Securing BCM power inputs exposed to relay coil flyback and motor driver commutation noise. IC Role / Device Role: Primary overvoltage clamp on fused 12 V supply line feeding microcontroller, CAN transceivers, and sensor interfaces. Use Value: 3600 W PPPM rating absorbs repetitive 10/1000 μs surges without degradation; DO-218AB package enables high-current PCB trace routing to heatsink plane. |
Use Scenario: Protecting front-facing ADAS camera module power input from vehicle-level transients during ignition and accessory mode transitions. IC Role / Device Role: High-reliability TVS placed between connector and DC/DC converter input to prevent latch-up or burnout of image sensor power management ICs. Use Value: AEC-Q101 qualification and 175 °C TJ rating ensure uninterrupted operation in sealed, thermally isolated camera housings exposed to solar loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/A | Lower PPPM (400 W), SMA package (DO-214AC), 20 V VWM, bidirectional variant available. | Targeted at lower-energy transients; unsuitable for ISO7637-2 load dump due to insufficient power rating. | Select only for cost-sensitive non-automotive applications where surge energy remains below 100 mJ. |
| TPSMD20HE3/2D | Same DO-218AB package, 20 V VWM, but 3500 W PPPM and 36.0 V VC at 98 A; not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial power supplies but not for OEM automotive BOMs requiring AEC certification. | Consider for industrial controls where AEC-Q101 is not mandated and thermal performance matches. |
Compared with SMAJ20AHE3/A and TPSMD20HE3/2D, the SM5S20HE3/2D uniquely combines AEC-Q101 qualification, 3600 W surge capability, and DO-218AB thermal performance-making it the only option among the three validated for automotive load dump protection in production vehicles.
Availability
SM5S20HE3/2D is available at Aetrix Electronics and suitable for automotive power protection, engine control unit (ECU) design, and body control module (BCM) development requiring stable component supply and long-term lifecycle support.
Supply support for SM5S20HE3/2D 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, and optoelectronics for automotive, industrial, and computing markets.
The SM5S series is engineered specifically for automotive-grade transient suppression, emphasizing high-temperature stability, AEC-Q101 compliance, and robust load dump immunity in compact surface-mount packages.
FAQ
What is the clamping voltage of the SM5S20HE3/2D at its rated peak pulse current?
The SM5S20HE3/2D has a maximum clamping voltage (VC) of 35.8 V at 101 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per the manufacturer's test methodology and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SM5S20HE3/2D maintains this clamping performance across its qualified temperature range up to TJ = 175 °C.
Is the SM5S20HE3/2D suitable for ISO7637-2 load dump protection?
Yes, the SM5S20HE3/2D meets ISO7637-2 surge specification for load dump (Pulse 5a) in 12 V automotive systems. Its 3600 W peak pulse power rating, 101 A IPPM, and 35.8 V clamping voltage enable effective suppression of the high-energy exponential waveform defined in the standard. The SM5S20HE3/2D is explicitly cited in Vishay documentation as compliant under varied test conditions.
What does the "HE3/2D" suffix indicate in SM5S20HE3/2D?
The "HE3" suffix denotes RoHS-compliant, matte tin-plated leads that meet JESD 201 Class 2 whisker resistance, while "/2D" specifies the preferred packaging: 13-inch plastic tape and reel with 750 units per reel and anode oriented toward the sprocket hole. This packaging format ensures consistent automated placement and thermal anchoring during reflow. The SM5S20HE3/2D uses this exact delivery mode per Vishay's ordering information.
How is thermal management implemented for the SM5S20HE3/2D?
The SM5S20HE3/2D relies on its metal heatsink tab (anode) for thermal conduction, with a specified junction-to-case thermal resistance (RθJC) of 1.0 °C/W. Effective thermal management requires soldering the anode tab to a large copper area or external heatsink. The DO-218AB package's low RθJC enables sustained power dissipation up to 5 W on an infinite heatsink at TC = 25 °C. The SM5S20HE3/2D must be mounted with verified thermal interface to avoid exceeding TJ = 175 °C.
Does the SM5S20HE3/2D have AEC-Q101 qualification?
Yes, the SM5S20HE3/2D is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 22-Jul-16 (Document Number: 88382). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling (TCT), and high-temperature gate bias (HTGB), validating its suitability for automotive electronic modules. The SM5S20HE3/2D carries the HE3 suffix, which explicitly denotes AEC-Q101 qualification per Vishay's material categorization.
SM5S20HE3/2D 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 101A
- 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
SM5S20HE3/2D FAQ
1.How can I place an order for SM5S20HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S20HE3/2D 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 SM5S20HE3/2D reliable?
The price and inventory of SM5S20HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S20HE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S20HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S20HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S20HE3/2D?
SM5S20HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S20HE3/2D 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 SM5S20HE3/2D?
For technical support, including SM5S20HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S20HE3/2D requirements.
6.How does Aetrix verify that SM5S20HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S20HE3/2D 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 SM5S20HE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S20HE3/2D?
All SM5S20HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S20HE3/2D, 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 SM5S20HE3/2D part is unused and in its original packaging.
Return procedure for SM5S20HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S20HE3/2D Tags
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