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Vishay General Semiconductor - Diodes Division SM6S22ATHE3/I
- Part No.:
- SM6S22ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S22ATHE3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,748
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Product details
Overview
SM6S22ATHE3/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 range (VBR at 5 mA), 35.5 V clamping voltage at 130 A peak pulse current (10/1000 μs), and 4600 W peak pulse power dissipation. Rated for TJ = 175 °C and AEC-Q101 qualified, it operates in DO-218AC package with anode-heatsink polarity.
For engineers reviewing the SM6S22ATHE3/I datasheet, SM6S22ATHE3/I pinout, SM6S22ATHE3/I application, or SM6S22ATHE3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where ISO 7637-2 compliance, low leakage (<10 μA at VWM), and robust 600 A surge capability are critical design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance across -55 °C to +175 °C junction temperature. Its unidirectional configuration and heatsink-anode construction enable direct thermal coupling to PCB copper, supporting high-power transient absorption without external heatsinking.
The device meets MSL Level 1 per J-STD-020 (245 °C reflow peak), has 0.95 °C/W junction-to-case thermal resistance, and is optimized for 10 ms exponential load dump waveforms - delivering up to 3600 W under 10/10 000 μs conditions while maintaining <1.9 V forward voltage at 100 A surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin on 12 V automotive systems. |
| VBR (min/typ/max) | 24.4 / 25.7 / 26.9 V at 5 mA - Confirmed breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 35.5 V at 130 A (10/1000 μs) - Clamping voltage limits downstream IC stress during load dump events. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling capacity supports severe ISO 7637-2 test pulses. |
| TJ max. | +175 °C - Enables placement near hot engine-control electronics without derating concerns. |
| Polarity | Unidirectional - Anode connected to heatsink; cathode to protected line; blocks reverse leakage in normal operation. |
| Package | DO-218AC - Surface-mount outline with integrated metal heatsink; RoHS-compliant, matte tin-plated leads. |
Pinout & Package
SM6S22ATHE3/I is housed in a DO-218AC package with two terminals: Lead 1 (cathode) and Lead 2 / metal heatsink (anode). The heatsink serves as the anode connection and provides primary thermal path to PCB copper. No internal die bonding wire; direct metal-to-die contact enables low RθJC (0.95 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Transient current sink | Connected to protected line (e.g., battery rail); conducts surge current into anode/heatsink during overvoltage. |
| Lead 2 / metal heatsink (anode) | Reference and thermal path | Electrically tied to system ground or chassis; provides low-impedance thermal interface to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Junction passivation | Optimized anisotropic rectifier structure minimizes parameter drift over lifetime and temperature extremes. |
| Low leakage at high temperature | <10 μA at VWM and TJ = 175 °C - preserves battery drain budget in always-on vehicle modules. |
| ISO 7637-2 compliance | Verified against Pulse 5a/b load dump profiles - no additional external filtering required for basic compliance. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 245 °C peak - eliminates moisture sensitivity handling constraints. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Clamp |
|---|---|
|
Use Scenario: Protects microcontroller power supply from alternator load dump spikes during ignition-off transitions in gasoline/diesel vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input; activates within nanoseconds of overvoltage onset. Use Value: Limits clamped voltage to ≤35.5 V, preventing damage to 36 V-rated input stages of buck converters and LDOs. |
Use Scenario: Shields BCM logic circuitry from transients induced by relay switching of lighting, HVAC, and door locks. IC Role / Device Role / Timing Role: Primary overvoltage suppression element on 12 V main rail; coordinated with upstream fuses and downstream LC filters. Use Value: Absorbs 4600 W surges without degradation, enabling single-device protection without parallel TVS stacking. |
| ADAS Camera Power Supply Protection | Start-Stop System Voltage Regulator Clamp |
|
Use Scenario: Safeguards image sensor and SerDes power rails in rear-view and surround-view cameras exposed to engine bay EMI and load dump. IC Role / Device Role / Timing Role: Fast-response transient clamp on 5 V or 3.3 V regulated output; placed immediately after DC-DC converter. Use Value: Maintains <10 μA leakage at 175 °C ambient, ensuring minimal impact on low-power sleep modes. |
Use Scenario: Stabilizes voltage regulator input during repeated cranking cycles and regenerative braking-induced battery voltage spikes. IC Role / Device Role / Timing Role: High-energy TVS on starter motor feed line; thermally coupled to chassis ground via metal heatsink. Use Value: Withstands 600 A IFSM (8.3 ms half-sine), surviving multiple start-stop events without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S22AHM3 | Same electrical specs; HM3 suffix indicates halogen-free molding compound and enhanced whisker resistance (JESD 201 Class 2). | Preferred for new designs targeting stricter material compliance; identical thermal and clamping behavior. | Select SM6S22AHM3 for production programs requiring halogen-free certification and long-term whisker mitigation. |
| SMAJ22A | Lower PPPM (400 W vs. 4600 W); DO-214AC package; 33.2 V clamping at 12.3 A; not AEC-Q101 qualified. | Suitable only for low-energy consumer or industrial transients; insufficient for automotive load dump. | Use SMAJ22A only in non-automotive applications with <500 W surge requirements and no AEC-Q101 mandate. |
Compared with SM6S22AHM3, the SM6S22ATHE3/I offers identical clamping and thermal performance but lacks halogen-free certification; compared with SMAJ22A, it delivers >11× higher surge power handling and automotive-grade qualification - making it irreplaceable for load dump-critical systems.
Availability
SM6S22ATHE3/I is available at Aetrix Electronics and suitable for automotive ECU protection, body control module hardening, ADAS camera power conditioning, and start-stop system voltage regulation requiring stable component supply across extended product lifecycles.
Supply support for SM6S22ATHE3/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 SM6SxxAT family was engineered specifically for automotive load dump protection, combining high-temperature junction stability, ISO 7637-2 compliance, and DO-218AC thermal efficiency to replace legacy axial and larger SMD TVS solutions.
FAQ
What is the maximum clamping voltage of the SM6S22ATHE3/I under standard test conditions?
The SM6S22ATHE3/I has a maximum clamping voltage (VC) of 35.5 V when subjected to a 10/1000 μs waveform at 130 A peak pulse current. This value is measured at TC = 25 °C and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events. The SM6S22ATHE3/I maintains this clamping performance across its full operating temperature range, with minor increase governed by its 0.086 %/°C VBR temperature coefficient.
Is the SM6S22ATHE3/I suitable for new automotive designs despite the "Not For New Designs" notice?
The "Not For New Designs" notice applies to the entire SM6SxxAT series due to Vishay's introduction of the improved SM6SxxAHM3 family. However, the SM6S22ATHE3/I remains fully available, supported, and qualified for production use through Aetrix Electronics. It retains full AEC-Q101 qualification, ISO 7637-2 compliance, and identical electrical performance - making it appropriate for legacy program continuity and cost-sensitive Tier 2/3 automotive applications where HM3-specific material compliance is not mandated.
How does the DO-218AC package of the SM6S22ATHE3/I improve thermal performance versus DO-214AC?
The DO-218AC package of the SM6S22ATHE3/I integrates a large metal heatsink as the anode terminal, reducing junction-to-case thermal resistance to 0.95 °C/W - nearly 5× lower than typical DO-214AC TVS diodes (~4.5–5.0 °C/W). This allows the SM6S22ATHE3/I to dissipate 4600 W pulses without external heatsinking, whereas DO-214AC devices require significant PCB copper area or auxiliary cooling to handle even 400 W surges. The heatsink also serves as the primary electrical anode connection.
Does the SM6S22ATHE3/I meet ISO 7637-2 Pulse 5a and 5b requirements?
Yes, the SM6S22ATHE3/I is explicitly validated to meet ISO 7637-2 for load dump transients (Pulse 5a and 5b), as confirmed in Vishay's application notes and characterization curves (Fig. 2: Load Dump Power Characteristics). Its 4600 W (10/1000 μs) and 3600 W (10/10 000 μs) ratings align directly with the energy demands of these standardized automotive tests, and its 175 °C junction rating ensures stable operation during repeated pulse exposure.
What is the leakage current specification of the SM6S22ATHE3/I at elevated temperature?
The SM6S22ATHE3/I specifies maximum reverse leakage current of 10 μA at VWM = 22 V and TJ = 175 °C. At room temperature (25 °C), leakage is ≤15 μA. This low, temperature-stable leakage ensures minimal impact on battery drain in always-on automotive modules such as telematics control units and remote keyless entry receivers - a critical requirement for 15-year vehicle service life targets.
SM6S22ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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):
- 130A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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-218AC
SM6S22ATHE3/I FAQ
1.How can I place an order for SM6S22ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S22ATHE3/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 SM6S22ATHE3/I reliable?
The price and inventory of SM6S22ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S22ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM6S22ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S22ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S22ATHE3/I?
SM6S22ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S22ATHE3/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 SM6S22ATHE3/I?
For technical support, including SM6S22ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S22ATHE3/I requirements.
6.How does Aetrix verify that SM6S22ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM6S22ATHE3/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 SM6S22ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM6S22ATHE3/I?
All SM6S22ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S22ATHE3/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 SM6S22ATHE3/I part is unused and in its original packaging.
Return procedure for SM6S22ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S22ATHE3/I Tags
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