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Vishay General Semiconductor - Diodes Division SM5S22AHM3/I
- Part No.:
- SM5S22AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S22AHM3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,225
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Product details
Overview
SM5S22AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 22 V standoff voltage (VWM), 25.7 V nominal breakdown voltage (VBR), 3600 W peak pulse power (10/1000 μs), and 175 °C junction temperature-designed for automotive load dump protection in engine control units and body electronics.
For engineers reviewing the SM5S22AHM3/I datasheet, SM5S22AHM3/I pinout, SM5S22AHM3/I application, or SM5S22AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance values, clamping behavior under surge, and direct alternative part guidance for legacy design continuity.
Technical Context
The SM5S22AHM3/I uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM) and low forward voltage drop (<2.0 V at 100 A), enabling robust clamping during high-energy transients. Its unidirectional polarity and heatsink-anode configuration support efficient thermal dissipation via metal slug mounting.
It meets ISO 7637-2 surge requirements for automotive load dump events and complies with MSL Level 1 (245 °C reflow peak), while delivering 101 A peak pulse current (IPPM) at 35.5 V clamping voltage (VC) under 10/1000 μs waveform-critical for protecting downstream 24 V system ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V automotive systems. |
| VBR (nom) | 25.7 V - Breakdown voltage at 5 mA test current; ensures reliable turn-on during transients exceeding normal rail voltage. |
| VC @ IPPM | 35.5 V - Clamping voltage at 101 A peak pulse current; limits stress on protected ICs during ISO 7637-2 load dump events. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capability; supports high-energy surge suppression without failure. |
| TJ max | 175 °C - Maximum junction temperature rating; enables operation in under-hood environments with minimal derating. |
| RθJM | 0.45 °C/W - Junction-to-mount thermal resistance; confirms effective heat transfer to PCB copper or heatsink when mounted per JEDEC 51-14. |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD; required for OEM production use. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with integral metal heatsink (anode terminal), UL 94 V-0 rated, RoHS-compliant, and lead-free matte tin plating. Mounting pad layout follows IPC 7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Anode) | Current entry point during clamping | Connected to system ground or chassis; serves as primary thermal path to PCB copper pour or heatsink. |
| Lead 2 / Metal Heatsink | Anode terminal extension | Large-area metal slug providing low RθJM (0.45 °C/W); must be soldered to thermal pad for rated power handling. |
| Cathode (marked end) | Clamped output node | Connected to protected circuit rail (e.g., 24 V supply line); carries surge current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure reduces leakage to <10 μA at VWM and improves long-term stability at 175 °C. |
| High surge capability | 3600 W peak pulse power (10/1000 μs) and 500 A IFSM enable survival of repeated load dump and inductive switching events. |
| Automotive qualification | AEC-Q101 qualification covers HTGB, TC, AC/HAST, and ESD testing-ensuring reliability in harsh vehicle environments. |
| Thermal performance | RθJM = 0.45 °C/W allows >90 % of surge energy to dissipate through the metal heatsink, minimizing junction temperature rise. |
| Low clamping ratio | VC/VBR = 35.5/25.7 ≈ 1.38 - Tight clamping margin protects sensitive 3.3 V/5 V logic rails downstream of DC-DC converters. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects 24 V input stage of diesel/gasoline ECU against alternator load dump surges up to 120 V for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamps transient voltage to ≤35.5 V within nanoseconds, shielding MCU power supply and analog front-end. Use Value: Prevents latch-up or permanent damage to LDO regulators and microcontrollers during ISO 7637-2 Pulse 5a/b events. |
Use Scenario: Shields 24 V power rail feeding isolated CAN transceivers and microcontrollers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Fast-response TVS absorbs coupled transients from adjacent high-current loads (e.g., window motors, solenoids). Use Value: Maintains CAN bus signal integrity by preventing power rail collapse that could disrupt communication timing or cause node reset. |
| ADAS Camera Power Supply Protection | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Safeguards 12 V/24 V input to image sensor power management ICs in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Clamps voltage spikes induced by nearby relay switching or EMI coupling in compact automotive enclosures. Use Value: Avoids pixel corruption or frame loss caused by temporary brownout or overvoltage on sensor bias rails. |
Use Scenario: Protects gate driver ICs and MOSFETs in EPS motor control H-bridge from inductive kickback during rapid direction reversal. IC Role / Device Role / Timing Role: Absorbs reverse EMF energy from motor windings, limiting drain-source voltage overshoot on power switches. Use Value: Extends MOSFET lifetime and prevents false triggering of overvoltage protection circuits during dynamic steering maneuvers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S22AHM3 | No /I suffix - same electrical specs, but packaged in 13" tape with sprocket hole orientation unspecified; lacks traceable reel marking. | Acceptable for non-traceable production; not suitable where full lot traceability (per AEC-Q101 Annex D) is required. | Select SM5S22AHM3/I when full manufacturing traceability, RoHS compliance documentation, and consistent anode orientation are mandatory. |
| SM5S24AHM3/I | Higher VWM (24 V) and VBR (28.1 V nom); 38.9 V clamping voltage; same DO-218AB package and AEC-Q101 qualification. | Better suited for 24 V systems with wider tolerance margins; may allow higher system-level surge immunity but reduces clamping headroom for downstream 24 V ICs. | Choose SM5S24AHM3/I only if design validation confirms 24 V nominal rail has ≥3 V margin above VWM and clamping at 38.9 V remains within protected IC absolute maximum ratings. |
Compared with SM5S22AHM3/I, SM5S22AHM3 offers identical protection performance but lacks full traceability, while SM5S24AHM3/I trades tighter clamping for higher standoff-requiring careful review of protected circuit voltage tolerances and system-level surge test profiles.
Availability
SM5S22AHM3/I is available at Aetrix Electronics and suitable for automotive ECU power protection, body electronics surge suppression, and ADAS camera module input conditioning requiring stable component supply across extended production lifecycles.
Supply support for SM5S22AHM3/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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM5S series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing high-temperature stability (175 °C), low clamping ratio, and robust surge endurance in DO-218AB packaging.
FAQ
What is the clamping voltage of the SM5S22AHM3/I under a 100 A surge?
The SM5S22AHM3/I clamps to 35.5 V at its rated peak pulse current of 101 A (IPPM) under 10/1000 μs waveform. This value is measured and guaranteed per datasheet Table on page 2. The SM5S22AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C), making it suitable for under-hood applications where thermal stability is critical.
Is the SM5S22AHM3/I qualified for automotive use?
Yes, the SM5S22AHM3/I is AEC-Q101 qualified and explicitly listed as such in the Vishay ordering information table (page 3). It undergoes stress testing including high-temperature reverse bias, temperature cycling, and ESD per AEC-Q101 Rev G. The "H" in the part number denotes AEC-Q101 qualification, and the "/I" suffix confirms traceable reel packaging compliant with automotive production requirements.
What does the "/I" suffix mean in SM5S22AHM3/I?
The "/I" suffix in SM5S22AHM3/I indicates industry-standard tape-and-reel packaging with anode orientation toward the sprocket hole, per Vishay's preferred ordering code definition (page 3). It ensures consistent placement during automated assembly and provides full lot traceability-required for automotive PPAP submissions. This distinguishes it from SM5S22AHM3, which lacks the /I marking and associated traceability controls.
Can the SM5S22AHM3/I replace older SM5S22A variants?
The SM5S22AHM3/I is a direct replacement for legacy SM5S22A in new designs requiring AEC-Q101 qualification and RoHS compliance. It shares identical electrical characteristics (VWM = 22 V, VBR = 25.7 V, VC = 35.5 V) and DO-218AB mechanical form factor. However, the original SM5S22A is not AEC-Q101 qualified and lacks the "H" and "/I" markings-so SM5S22AHM3/I should be used where automotive reliability certification is mandatory.
What is the thermal resistance from junction to mount for SM5S22AHM3/I?
The SM5S22AHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.45 °C/W, measured per JEDEC 51-14 using the Transient Dual Interface Method. This low value reflects the efficiency of its metal heatsink (anode) in transferring surge energy directly to the PCB thermal pad. Proper soldering of the metal slug to a ≥100 mm² copper area is required to achieve this rating and sustain 3600 W peak pulse power.
SM5S22AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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-218AC
SM5S22AHM3/I FAQ
1.How can I place an order for SM5S22AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S22AHM3/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 SM5S22AHM3/I reliable?
The price and inventory of SM5S22AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S22AHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S22AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S22AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S22AHM3/I?
SM5S22AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S22AHM3/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 SM5S22AHM3/I?
For technical support, including SM5S22AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S22AHM3/I requirements.
6.How does Aetrix verify that SM5S22AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S22AHM3/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 SM5S22AHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S22AHM3/I?
All SM5S22AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S22AHM3/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 SM5S22AHM3/I part is unused and in its original packaging.
Return procedure for SM5S22AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S22AHM3/I Tags
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