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Vishay General Semiconductor - Diodes Division SM5S22AHE3_A/I
- Part No.:
- SM5S22AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S22AHE3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,379
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Product details
Overview
SM5S22AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 5 mA, 3600 W peak pulse power (10/1000 μs), 101 A clamping current (IPPM), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S22AHE3_A/I datasheet, SM5S22AHE3_A/I pinout, SM5S22AHE3_A/I application, or SM5S22AHE3_A/I equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJM = 0.45 °C/W), 175 °C junction rating, low leakage (<10 μA at VWM), and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for high-reliability operation. Its unidirectional configuration places the heatsink as the anode terminal, enabling efficient thermal dissipation into PCB copper during high-energy transients.
The device delivers stable clamping performance across -55 °C to +175 °C, supported by a VBR temperature coefficient of 0.086 %/°C. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing due to matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins; defines system bus voltage compatibility. |
| VBR (min/typ/max) | 24.4 / 25.7 / 26.9 V at 5 mA - Ensures reliable triggering above nominal supply while accommodating tolerance and temperature drift. |
| VC @ IPPM | 35.5 V at 101 A (10/1000 μs) - Clamping voltage limits downstream IC stress during load dump events. |
| PPPM | 3600 W (10/1000 μs) - Sustains high-energy transients common in 12 V automotive systems without failure. |
| TJ max | +175 °C - Enables placement near heat sources (e.g., engine control units) without derating concerns. |
| Leakage ID | <10 μA at VWM, <15 μA at TJ = 175 °C - Minimizes standby power loss in always-on vehicle modules. |
| Package | DO-218AB - Thermally enhanced surface-mount case with metal heatsink terminal for low RθJM (0.45 °C/W). |
Pinout & Package
Package: DO-218AB - thermally optimized surface-mount case with integrated metal heatsink; anode connected to heatsink, cathode on lead 1; UL 94 V-0 molding compound; RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive terminal / thermal path | Directly bonded to PCB copper pour for low-impedance heat transfer; must be connected to system ground or chassis return. |
| Cathode (Lead 1) | Transient current sink | Connected to protected line (e.g., battery rail); conducts surge current to anode/heatsink during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivated anisotropic rectifier | Enables stable VBR and low leakage up to 175 °C junction temperature without parametric shift. |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock tests. |
| ISO7637-2 compliance | Withstands standardized automotive load dump pulses (Test Pulse 5a) when properly mounted on adequate copper area. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 245 °C without moisture-induced damage. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth on matte tin terminations, ensuring long-term solder joint reliability. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of 12 V power input against alternator load dump spikes during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy directly at power entry point before DC/DC converters. Use Value: Limits clamped voltage to 35.5 V, preventing damage to 40 V-rated power management ICs and microcontrollers. |
Use Scenario: Safeguarding LIN bus power rails and sensor interfaces from coupled transients in door modules and lighting controls. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp placed adjacent to connector entry to absorb coupled noise and switching surges. Use Value: Low leakage (<10 μA) avoids signal integrity degradation on always-on 12 V monitoring lines. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) ECU |
Use Scenario: Input protection for image sensor power supplies exposed to ignition transients and hot-swap events. IC Role / Device Role / Timing Role: Primary front-end TVS on 12 V input, coordinated with secondary LC filtering for broadband suppression. Use Value: 3600 W peak pulse rating handles worst-case ISO7637-2 Pulse 5a without degradation over 1000+ events. |
Use Scenario: Transient suppression on motor driver power stage inputs subjected to inductive kickback from steering column actuation. IC Role / Device Role / Timing Role: High-current TVS placed between battery feed and H-bridge MOSFET source terminals. Use Value: Metal heatsink anode enables direct thermal coupling to EPS aluminum housing, maintaining TJ < 150 °C during repeated surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S22AHM3_A/I | Same electrical specs and DO-218AB package; HM3 suffix indicates halogen-free, Pb-free, and AEC-Q101 qualified with updated material content. | No functional difference; intended as direct replacement for HE3-series in new designs requiring updated environmental compliance. | Select SM5S22AHM3_A/I for new designs where halogen-free and latest AEC-Q101 revision compliance are mandatory. |
| SMAJ22A | Lower PPPM (400 W), SMA package (RθJA ≈ 60 °C/W), no AEC-Q101 qualification, higher leakage (≤50 μA). | Limited to non-automotive industrial or consumer applications with lower surge severity and ambient temperature. | Use SMAJ22A only in cost-sensitive, non-automotive applications where 3600 W surge capability and 175 °C operation are not required. |
Compared with SM5S22AHE3_A/I, SM5S22AHM3_A/I offers identical protection performance with updated environmental compliance, while SMAJ22A provides basic TVS functionality at lower cost and power handling but lacks automotive qualification and thermal robustness.
Availability
SM5S22AHE3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power systems requiring stable component supply, AEC-Q101 validation, and high-temperature transient protection.
Supply support for SM5S22AHE3_A/I 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 SM5SxxA family is engineered specifically for automotive load dump and ISO7637-2 transient suppression, emphasizing thermal robustness, AEC-Q101 qualification, and high-power pulse handling in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SM5S22AHE3_A/I during a 10/1000 μs transient?
The SM5S22AHE3_A/I has a maximum clamping voltage (VC) of 35.5 V at 101 A peak pulse current under a 10/1000 μs waveform. This value is measured per standard test conditions and ensures protected downstream circuitry remains below safe voltage thresholds during automotive load dump events. The SM5S22AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SM5S22AHE3_A/I suitable for new automotive designs?
No - the SM5S22AHE3_A/I is marked "Not For New Designs" in Vishay's official documentation. Vishay recommends SM5S22AHM3_A/I as the designated alternative for new projects, offering identical electrical performance with updated halogen-free and Pb-free compliance. The SM5S22AHE3_A/I remains available for legacy production continuity but should not be selected for newly initiated designs.
How is the anode terminal configured on the SM5S22AHE3_A/I DO-218AB package?
On the SM5S22AHE3_A/I, the metal heatsink serves as the anode terminal, while Lead 1 is the cathode. This configuration requires the heatsink to be soldered directly to a large PCB copper pour or chassis ground plane to achieve the specified RθJM of 0.45 °C/W. Proper thermal anchoring is essential to sustain repeated 3600 W transients without exceeding the 175 °C maximum junction temperature.
Does the SM5S22AHE3_A/I meet ISO7637-2 requirements?
Yes - the SM5S22AHE3_A/I is specified to meet ISO7637-2 surge requirements, particularly Test Pulse 5a (load dump), when implemented with appropriate PCB layout: minimum 2 oz. copper on both sides, ≥25 mm² heatsink pad, and short, low-inductance connections. Compliance is validated per Vishay's characterization data in Document Number 88382, not assumed from generic TVS capability.
What is the leakage current specification for SM5S22AHE3_A/I at elevated temperature?
The SM5S22AHE3_A/I exhibits ≤15 μA maximum reverse leakage current at VWM = 22 V and TJ = 175 °C. At room temperature (25 °C), leakage is ≤10 μA. This low, thermally stable leakage ensures minimal impact on always-on vehicle subsystems such as telematics and alarm circuits, preserving battery life over extended parking periods.
SM5S22AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- 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
SM5S22AHE3_A/I FAQ
1.How can I place an order for SM5S22AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S22AHE3_A/I 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 SM5S22AHE3_A/I reliable?
The price and inventory of SM5S22AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S22AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM5S22AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S22AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S22AHE3_A/I?
SM5S22AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S22AHE3_A/I 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 SM5S22AHE3_A/I?
For technical support, including SM5S22AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S22AHE3_A/I requirements.
6.How does Aetrix verify that SM5S22AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM5S22AHE3_A/I 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 SM5S22AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM5S22AHE3_A/I?
All SM5S22AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S22AHE3_A/I, 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 SM5S22AHE3_A/I part is unused and in its original packaging.
Return procedure for SM5S22AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S22AHE3_A/I Tags
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