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Vishay General Semiconductor - Diodes Division SM5S20AHE3/2D
- Part No.:
- SM5S20AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S20AHE3/2D.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
SM5S20AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor diode designed for automotive load dump protection in 12 V systems. It features a 20 V standoff voltage (VWM), 22.2–24.5 V breakdown range (VBR), 32.4 V clamping voltage at 111 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood reliability.
For engineers reviewing the SM5S20AHE3/2D datasheet, SM5S20AHE3/2D pinout, SM5S20AHE3/2D application, or SM5S20AHE3/2D equivalent, key selection criteria include its DO-218AB package thermal performance (RθJC = 1.0 °C/W), 175 °C junction rating, uni-directional polarity with anode-connected heatsink, and compliance with ISO7637-2 load dump surge testing.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive electronics, conducting only when reverse voltage exceeds VBR to limit transients to ≤32.4 V. Its passivated anisotropic rectifier structure enables low leakage (<10 μA at VWM) and low forward voltage (<2.0 V at 100 A) while sustaining 500 A non-repetitive surge current.
The DO-218AB package integrates a metal heatsink terminal (anode) for direct PCB thermal coupling, supporting 5 W steady-state dissipation on infinite heatsink and enabling stable operation up to TJ = 175 °C - critical for engine control units and body electronics exposed to high ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold for 12 V automotive rails. |
| VBR (min/max) | 22.2 V / 24.5 V - Verified breakdown range at 5 mA test current; ensures consistent clamping onset across production lots and temperature. |
| VC @ IPPM | 32.4 V - Clamped voltage at 111 A peak pulse (10/1000 μs); guarantees downstream ICs see no more than this during load dump events. |
| PPPM (10/1000 μs) | 3600 W - Peak transient power handling capacity; meets ISO7637-2 Pulse 5a requirements for 12 V vehicle systems. |
| TJ max. | 175 °C - Maximum junction temperature rating; supports placement near heat sources without derating in engine compartment applications. |
| RθJC | 1.0 °C/W - Junction-to-case thermal resistance; enables precise thermal design when mounted to copper pour or heatsinked PCB layers. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD per JESD22 standards; required for ECUs and ADAS modules. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with integrated metal heatsink terminal (anode). Dimensions: 15.4 mm × 9.5 mm × 3.0 mm (L × W × H); matte tin-plated leads; MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Transient current return path | Soldered to protected circuit ground; carries full clamp current during surge events; requires low-inductance trace routing. |
| Lead 2 / Metal Heatsink (anode) | Main power rail connection & thermal interface | Connected to 12 V supply line; serves as primary thermal conduction path to PCB copper; must be soldered to ≥200 mm² copper area for rated power handling. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables <10 μA reverse leakage at VWM and 25 °C, reducing standby power loss in always-on automotive modules. |
| DO-218AB metal heatsink terminal | Provides direct thermal path from die to PCB, achieving 1.0 °C/W RθJC and enabling 5 W continuous dissipation without external heatsink. |
| AEC-Q101 qualification | Validates robustness against temperature cycling, humidity, mechanical shock, and ESD - mandatory for powertrain and chassis control units. |
| ISO7637-2 compliance (Pulse 5a) | Guarantees survivability against 12 V system load dump transients up to 3600 W, eliminating need for additional external filtering stages. |
| Uni-directional polarity with anode heatsink | Prevents unintended conduction during normal forward-biased operation while maximizing thermal coupling to the 12 V rail. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Load Dump Suppression |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and sensor interfaces in gasoline/diesel ECUs from alternator load dump surges during battery disconnect events. IC Role / Device Role / Timing Role: Clamping TVS diode placed directly across 12 V input rail and chassis ground, activated within nanoseconds of overvoltage detection. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies derived from the main rail. |
Use Scenario: Shields BCM power inputs during simultaneous switching of multiple high-current loads (e.g., headlights, HVAC blower, window motors). IC Role / Device Role / Timing Role: Fast-response parallel protection device absorbing energy from inductive kickback and line transients before they reach LDOs and MCU cores. Use Value: Sustains 3600 W peak pulse without degradation, maintaining system uptime and avoiding false resets during aggressive load cycling. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Rail | Electric Power Steering (EPS) Motor Driver Supply Protection |
Use Scenario: Secures 12 V input to image sensor SoCs and ISP processors in front/rear-view cameras exposed to engine bay thermal and electrical stress. IC Role / Device Role / Timing Role: Primary overvoltage clamp on camera module's main power entry point, coordinated with upstream fusing and downstream LC filtering. Use Value: Operates reliably at 175 °C junction temperature, ensuring protection integrity even when mounted adjacent to hot optics housings or LED illuminators. |
Use Scenario: Guards gate driver ICs and current sense amplifiers in EPS motor control boards subjected to repeated load dump and jump-start conditions. IC Role / Device Role / Timing Role: High-energy transient suppressor connected between motor driver high-side supply and ground, referenced to the same heatsink plane as power MOSFETs. Use Value: Leverages DO-218AB anode heatsink for shared thermal management with power stage, minimizing board space while delivering 500 A surge current capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Lower PPPM (400 W), SMA package (RθJC ≈ 45 °C/W), VC = 32.4 V at 12.3 A - not suitable for ISO7637-2 Pulse 5a. | Limited to low-energy transients (e.g., ESD, minor switching noise); insufficient for automotive load dump. | Select SM5S20AHE3/2D when full ISO7637-2 compliance and 3600 W surge handling are required. |
| TPSMD20A | Same DO-218AB package and 3600 W rating, but VBR = 22.2–24.5 V and VC = 32.4 V match exactly; RoHS/AEC-Q101 qualified. | Drop-in functional replacement with identical electrical specs and thermal performance; differs only in manufacturer and branding. | TPSMD20A offers second-source availability but shares identical design constraints and layout requirements as SM5S20AHE3/2D. |
Compared with SMAJ20A and TPSMD20A, SM5S20AHE3/2D uniquely combines AEC-Q101 qualification, DO-218AB thermal efficiency (1.0 °C/W), and verified ISO7637-2 Pulse 5a compliance - making it the only choice for high-reliability 12 V automotive power rail protection where thermal margin and surge energy absorption are co-critical.
Availability
SM5S20AHE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and advanced driver assistance systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant transient protection.
Supply support for SM5S20AHE3/2D 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-power, and automotive-qualified components.
The SM5SxxA series was developed specifically for demanding automotive power rail protection, integrating thermal robustness, surge immunity, and AEC-Q101 validation into the DO-218AB package for under-hood deployment.
FAQ
What is the maximum clamping voltage of the SM5S20AHE3/2D during a 10/1000 μs surge event?
The SM5S20AHE3/2D clamps to a maximum of 32.4 V at its rated peak pulse current of 111 A under a 10/1000 μs waveform. This value is measured and guaranteed per the Vishay datasheet (Document Number: 88382, Rev. 22-Jul-16) and defines the upper voltage limit imposed on protected circuits during standardized load dump transients.
Is the SM5S20AHE3/2D suitable for bidirectional transient suppression?
No, the SM5S20AHE3/2D is strictly unidirectional - its anode is the metal heatsink terminal and cathode is Lead 1. It conducts only during reverse-biased overvoltage events and cannot suppress positive-going transients on grounded lines. For bidirectional protection, a separate device or a dedicated bi-directional TVS such as SMBJ20CA would be required.
Does the SM5S20AHE3/2D require a heatsink on the PCB?
The SM5S20AHE3/2D uses its metal heatsink terminal (anode) as the primary thermal path; no external heatsink is needed if mounted to ≥200 mm² of 2 oz copper on the PCB. Its RθJC of 1.0 °C/W allows 5 W continuous dissipation with proper copper area - essential for sustained operation in high-ambient environments like engine compartments.
How does the SM5S20AHE3/2D meet ISO7637-2 compliance?
The SM5S20AHE3/2D meets ISO7637-2 Pulse 5a (load dump) requirements by sustaining 3600 W peak pulse power (10/1000 μs) and clamping to ≤32.4 V at 111 A. Vishay confirms compliance in the datasheet, noting performance varies by test condition - actual validation requires system-level testing per ISO7637-2 Annex A using the specified exponential waveform.
What is the meaning of the "HE3/2D" suffix in SM5S20AHE3/2D?
The "HE3" suffix indicates RoHS-compliant, matte tin-plated leads meeting JESD201 Class 2 whisker resistance and J-STD-002 solderability standards. The "/2D" denotes packaging: 750-unit quantity on 13-inch plastic tape and reel, with anode oriented toward the sprocket hole - critical for automated pick-and-place alignment during assembly.
SM5S20AHE3/2D 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:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 111A
- 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
SM5S20AHE3/2D FAQ
1.How can I place an order for SM5S20AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S20AHE3/2D 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 SM5S20AHE3/2D reliable?
The price and inventory of SM5S20AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S20AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S20AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S20AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S20AHE3/2D?
SM5S20AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S20AHE3/2D 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 SM5S20AHE3/2D?
For technical support, including SM5S20AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S20AHE3/2D requirements.
6.How does Aetrix verify that SM5S20AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S20AHE3/2D 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 SM5S20AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S20AHE3/2D?
All SM5S20AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S20AHE3/2D, 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 SM5S20AHE3/2D part is unused and in its original packaging.
Return procedure for SM5S20AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S20AHE3/2D Tags
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