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Vishay General Semiconductor - Diodes Division SM5S22AHE3/2D
- Part No.:
- SM5S22AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S22AHE3/2D.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,245
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Product details
Overview
SM5S22AHE3/2D 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 22.0 V stand-off voltage (VWM), 24.4–26.9 V breakdown range (VBR), 35.5 V clamping voltage at 101 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S22AHE3/2D datasheet, SM5S22AHE3/2D pinout, SM5S22AHE3/2D application, or SM5S22AHE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 1.0 °C/W), TJ = 175 °C operation, ISO7637-2 compliance, and low leakage (<10 μA at VWM).
Technical Context
The SM5S22AHE3/2D employs passivated anisotropic rectifier technology optimized for junction stability at TJ = 175 °C, enabling sustained operation in automotive engine compartments. Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining low VF ≤ 2.0 V at 100 A surge.
It delivers 3600 W peak pulse power with 10/1000 μs waveform and sustains 2800 W with 10/10 000 μs waveform-critical for extended load dump transients. The heatsink-is-anode polarity and DO-218AB case support efficient thermal coupling to PCB copper planes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before clamping begins; defines system nominal bus tolerance. |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown voltage range at 5 mA test current; ensures reliable turn-on margin above VWM. |
| VC @ IPPM | 35.5 V at 101 A - Clamping voltage during 10/1000 μs surge; limits downstream IC stress in 12 V automotive circuits. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling; supports ISO7637-2 Load Dump Pulse 5a (up to 35 V, 100 ms) when derated. |
| TJ max. | 175 °C - Maximum junction temperature; enables placement near heat sources without derating penalties. |
| RθJC | 1.0 °C/W - Junction-to-case thermal resistance; allows direct heatsinking to PCB ground plane for sustained power dissipation. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink cathode terminal (Lead 2), matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (245 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to protected line (e.g., battery feed); conducts forward during clamping event. |
| Lead 2 / Metal Heatsink | Cathode | Primary thermal path and electrical return; must be soldered to large copper area for RθJC = 1.0 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage up to TJ = 175 °C. |
| Low forward voltage drop | VF ≤ 2.0 V at 100 A (8.3 ms half-sine) minimizes conduction loss during sustained overvoltage events. |
| High surge capability | IFSM = 500 A (8.3 ms) and IPPM = 101 A (10/1000 μs) enable robust protection against alternator load dump. |
| Automotive qualification | AEC-Q101 qualified and ISO7637-2 compliant - validated for harsh automotive environments including thermal cycling and humidity exposure. |
| RoHS-compliant HE3 suffix | Meets JESD 201 Class 2 whisker resistance and RoHS Directive 2011/65/EU - suitable for lead-free assembly. |
Applications
| Automotive Load Dump Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting ECUs, body control modules, and infotainment systems from alternator-induced load dump transients (ISO7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping excess energy into chassis ground via heatsink terminal. Use Value: Limits voltage to ≤35.5 V during 101 A surges, preventing damage to downstream 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding 12 V supply inputs of ADAS cameras, radar sensors, and gateway ECUs against switching noise and inductive kickback. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed at board-level input connector, ahead of EMI filters and LDOs. Use Value: Achieves <10 μA leakage at 22 V, preserving sleep-mode current budgets while delivering 3600 W pulse immunity. |
| Engine Control Unit Input Protection | Start-Stop System Voltage Clamp |
Use Scenario: Shielding fuel injection drivers and crankshaft position sensor interfaces from battery reversal and cranking spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V rail feeding MCU power management ICs. Use Value: Withstands TJ = 175 °C ambient and maintains VBR stability across -55 °C to +175 °C, ensuring reliability in under-hood locations. |
Use Scenario: Managing voltage overshoot during engine restart in 12 V start-stop systems where battery voltage can spike to 35 V. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing transient energy between battery and buck converter input. Use Value: Delivers 2800 W rating at 10/10 000 μs waveform - matches extended duration of start-stop transients better than standard 10/1000 μs ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5AT | DO-214AC package (SMA), lower PPPM (400 W), higher RθJA, no AEC-Q101 qualification. | Limited to non-automotive industrial or consumer applications; unsuitable for under-hood use. | Select only for cost-sensitive, non-automotive designs where 3600 W surge capacity and 175 °C operation are not required. |
| TPSMD22A | DO-218AB package, same VWM/VBR range, but lower clamping voltage (33.2 V @ 103 A) and no ISO7637-2 validation. | Validated for general-purpose surge suppression but lacks documented automotive load dump compliance. | Consider when lower VC is prioritized and ISO7637-2 certification is not mandated by OEM specification. |
Compared with SMAJ22A-E3/5AT and TPSMD22A, the SM5S22AHE3/2D uniquely combines AEC-Q101 qualification, 3600 W peak power, DO-218AB thermal performance (RθJC = 1.0 °C/W), and explicit ISO7637-2 compliance - making it the only option qualified for front-end 12 V load dump protection in production automotive ECUs.
Availability
SM5S22AHE3/2D is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and start-stop system designs requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SM5S22AHE3/2D 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 TVS devices for automotive, industrial, and computing markets.
The SM5SxxA series is engineered specifically for automotive load dump protection, emphasizing high-temperature stability (TJ = 175 °C), low-leakage unidirectional clamping, and robust surge endurance in DO-218AB packaging.
FAQ
What is the maximum clamping voltage of the SM5S22AHE3/2D at its rated peak pulse current?
The SM5S22AHE3/2D has a maximum clamping voltage (VC) of 35.5 V at 101 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per the conditions specified in the Vishay datasheet Document Number 88382 and ensures downstream components see limited overvoltage stress during automotive load dump events. The SM5S22AHE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S22AHE3/2D suitable for bidirectional transient suppression?
No, the SM5S22AHE3/2D is a unidirectional TVS diode only, with polarity defined as heatsink = cathode and Lead 1 = anode. It does not provide reverse-direction clamping. For bidirectional protection, a separate device such as the SMBJ22CA or a dual-diode configuration would be required. The SM5S22AHE3/2D datasheet explicitly states "Available in uni-directional polarity only" and specifies anode-to-heatsink orientation.
What does the HE3/2D suffix indicate for the SM5S22AHE3/2D?
The HE3 suffix denotes RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance, while the /2D indicates packaging in 13" diameter plastic tape and reel with 750 units per reel and anode orientation toward the sprocket hole. This packaging format ensures compatibility with automated SMT placement equipment and supports high-volume automotive manufacturing. The SM5S22AHE3/2D uses matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Does the SM5S22AHE3/2D meet ISO7637-2 requirements?
Yes, the SM5S22AHE3/2D meets ISO7637-2 surge specification for automotive applications, as confirmed in the Vishay datasheet. It is validated for Load Dump Pulse 5a under defined test conditions and leverages its 3600 W (10/1000 μs) and 2800 W (10/10 000 μs) ratings to absorb energy from both fast and extended transients. The SM5S22AHE3/2D is also AEC-Q101 qualified, reinforcing its suitability for certified automotive designs.
What is the thermal resistance from junction to case (RθJC) for the SM5S22AHE3/2D?
The SM5S22AHE3/2D has a typical thermal resistance of RθJC = 1.0 °C/W, measured from junction to the metal heatsink terminal (Lead 2). This low value enables effective heat transfer to PCB copper planes or external heatsinks, supporting sustained power dissipation in high-temperature environments. The DO-218AB package design and heatsink-is-cathode configuration are integral to achieving this RθJC performance in the SM5S22AHE3/2D.
SM5S22AHE3/2D 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):
- 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
SM5S22AHE3/2D FAQ
1.How can I place an order for SM5S22AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S22AHE3/2D 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 SM5S22AHE3/2D reliable?
The price and inventory of SM5S22AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S22AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S22AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S22AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S22AHE3/2D?
SM5S22AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S22AHE3/2D 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 SM5S22AHE3/2D?
For technical support, including SM5S22AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S22AHE3/2D requirements.
6.How does Aetrix verify that SM5S22AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S22AHE3/2D 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 SM5S22AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S22AHE3/2D?
All SM5S22AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S22AHE3/2D, 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 SM5S22AHE3/2D part is unused and in its original packaging.
Return procedure for SM5S22AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S22AHE3/2D Tags
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