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Vishay General Semiconductor - Diodes Division SM8S22CAHM3/I
- Part No.:
- SM8S22CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S22CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
SM8S22CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, designed for automotive load dump protection with 22 V standoff voltage, 25.7 V nominal breakdown voltage, and 35.5 V maximum clamping voltage at 186 A peak pulse current (10/1000 μs). It delivers 6600 W peak pulse power and operates up to 175 °C junction temperature.
For engineers reviewing the SM8S22CAHM3/I datasheet, SM8S22CAHM3/I pinout, SM8S22CAHM3/I application, or SM8S22CAHM3/I equivalent, this AEC-Q101 qualified TVS offers verified ISO 7637-2 and ISO 16750-2 compliance, low leakage (<10 μA at VWM), MSL Level 1 rating, and halogen-free RoHS-compliant construction - critical for high-reliability automotive power rail protection.
Technical Context
This TVS diode uses silicon avalanche technology to clamp transients by entering breakdown when reverse voltage exceeds VBR (24.4–26.9 V), limiting downstream voltage to ≤35.5 V under 186 A surge. Its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.35 °C/W) and high-power dissipation capability.
The device is unidirectionally non-applicable - polarity is strictly bidirectional with no cathode band - and features <10 μA reverse leakage at 22 V stand-off and <15 μA at 175 °C, enabling stable operation in hot under-hood environments without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bus margin for 24 V automotive systems. |
| VBR (nom) | 25.7 V - Typical breakdown voltage at 5 mA test current; ensures reliable turn-on during load dump events above system nominal. |
| VC @ IPPM | 35.5 V - Clamped voltage at 186 A (10/1000 μs); guarantees downstream ICs see ≤35.5 V during worst-case surge. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling; supports EN 50155 and ISO 7637-2 Pulse 5a/b waveforms without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near engines or power converters without derating concerns. |
| ID @ VWM | <10 μA at 25 °C - Ultra-low leakage preserves battery drain budgets in always-on vehicle modules. |
| MSL Level | Level 1 (245 °C peak reflow) - Supports standard SMT assembly without moisture sensitivity restrictions. |
Pinout & Package
Package: DO-218AC - surface-mount, bidirectional TVS with integrated metal heatsink terminal (Lead 2), matte tin-plated leads, UL 94 V-0 molding compound, and AEC-Q101 qualification. Dimensions: 6.28 × 5.00 × 3.00 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | Non-polarized terminal; connects to protected line (e.g., battery rail) - no marking required per spec. |
| Lead 2 / Metal Heatsink | Common reference / thermal path | Primary thermal interface to PCB copper pour; must be soldered to ≥100 mm² 2-oz copper for RθJA ≤55 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Pulse 5a (load dump) and Pulse 5b (superimposed ripple) tests - eliminates need for external validation in OEM designs. |
| DO-218AC metal heatsink | Enables 6600 W surge handling with RθJM = 0.35 °C/W - reduces thermal stress vs. SMA/SMB packages by >40 % under repeated surges. |
| Bidirectional symmetry | No polarity marking needed; simplifies layout and prevents misassembly in dual-rail or AC-coupled protection schemes. |
| Halogen-free, RoHS-compliant (M3) | Meets global environmental regulations and JESD201 Class 2 whisker resistance - suitable for export-controlled automotive programs. |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Clamp |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and infotainment head units from alternator load dump transients (ISO 7637-2 Pulse 5a, up to 60 V/100 ms). IC Role / Device Role / Timing Role: Primary clamping device on main battery input rail, placed upstream of DC-DC converters and LDOs. Use Value: Limits voltage to ≤35.5 V during 186 A surge, preventing latch-up or gate oxide damage in downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding 24 V industrial vehicle systems (e.g., forklifts, buses) against switching spikes from solenoids, relays, and motors. IC Role / Device Role / Timing Role: Standoff-clamp TVS on switched 24 V distribution lines feeding lighting, HVAC, and telematics modules. Use Value: Maintains 22 V working margin while clamping to 35.5 V - avoids nuisance tripping yet protects against >40 V transients. |
| ADAS Camera Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
Use Scenario: Securing front/rear camera modules powered from vehicle battery, exposed to ignition noise and jump-start surges. IC Role / Device Role / Timing Role: First-line transient suppressor on 12 V input before buck converter and image sensor power management IC. Use Value: Sub-10 μA leakage preserves sleep-mode current budget; 175 °C rating allows placement near heat-generating image processors. |
Use Scenario: Protecting BCM power inputs shared with CAN transceivers and LIN nodes during load switching in door modules and seat controls. IC Role / Device Role / Timing Role: Bidirectional clamp on fused 12 V supply rail feeding multiple communication ICs and drivers. Use Value: Bidirectional operation handles both positive and negative transients from inductive loads - no polarity risk during service replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A | Unidirectional; lower PPPM (400 W); SMA package; no AEC-Q101 or ISO compliance. | Limited to low-energy consumer or industrial I/O protection - not suitable for automotive load dump. | Select only for cost-sensitive non-automotive designs where surge energy is <10 % of SM8S22CAHM3/I capability. |
| TPSMD22CA | Bidirectional; same VWM/VBR range; DO-218AC package; but rated for 5000 W (10/10k μs), not 6600 W (10/1000 μs). | Valid for ISO 16750-2 but not fully validated for ISO 7637-2 Pulse 5a - requires additional system-level testing. | Acceptable for less demanding automotive sub-systems (e.g., interior lighting) where full load dump immunity is not mandated. |
Compared with SMAJ22A-E3/5A and TPSMD22CA, SM8S22CAHM3/I provides superior surge robustness (6600 W), certified automotive qualification (AEC-Q101 + ISO 7637-2), and thermal performance - making it the only choice for safety-critical 24 V rail protection without design margin compromise.
Availability
SM8S22CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, ADAS camera power conditioning, and 24 V commercial vehicle body control modules requiring stable component supply across multi-year production cycles.
Supply support for SM8S22CAHM3/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, and passive components for automotive, industrial, and computing markets.
The SM8SxxCA family is engineered specifically for high-energy automotive transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and DO-218AC thermal performance - targeting next-generation 12 V/24 V vehicle electrical architectures.
FAQ
What is the maximum clamping voltage of SM8S22CAHM3/I under a 10/1000 μs surge?
The SM8S22CAHM3/I has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 186 A using the 10/1000 μs waveform. This value is measured per Figure 4 in the official Vishay datasheet (Doc. #98229) and ensures downstream circuitry remains within safe operating limits during standardized load dump events.
Is SM8S22CAHM3/I suitable for 24 V automotive systems?
Yes, SM8S22CAHM3/I is explicitly designed for 24 V automotive systems. Its 22 V stand-off voltage (VWM) provides appropriate margin above nominal 24 V rails, while its 35.5 V clamping voltage safely contains ISO 7637-2 Pulse 5a load dump transients. It is AEC-Q101 qualified and meets ISO 16750-2 requirements - confirming suitability for under-hood and chassis-mounted applications.
Does SM8S22CAHM3/I require polarity-aware PCB layout?
No, SM8S22CAHM3/I is a bidirectional TVS diode with no cathode band or polarity marking. The DO-218AC package has symmetric terminals (Lead 1 and Lead 2/Metal Heatsink), and the device functions identically regardless of orientation on the PCB - reducing assembly errors and simplifying layout for dual-rail or AC-coupled protection schemes.
What is the thermal resistance from junction to mount (RθJM) for SM8S22CAHM3/I?
The SM8S22CAHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.35 °C/W, measured per JEDEC® 51-14 using the Transient Dual Interface Test Method. This low value is enabled by the DO-218AC package's integral metal heatsink terminal, which must be soldered to a large PCB copper area to realize full thermal benefit in high-surge applications.
How does SM8S22CAHM3/I differ from standard SMAJ-series TVS diodes?
SM8S22CAHM3/I differs from SMAJ22A in three key ways: it delivers 6600 W peak pulse power (vs. 400 W), is AEC-Q101 qualified and ISO 7637-2 compliant (SMAJ22A is not), and uses the thermally superior DO-218AC package with metal heatsink (vs. SMA's plastic-body thermal limit). These differences make SM8S22CAHM3/I suitable for automotive load dump, whereas SMAJ22A is limited to low-energy I/O protection.
SM8S22CAHM3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 186A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S22CAHM3/I FAQ
1.How can I place an order for SM8S22CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22CAHM3/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 SM8S22CAHM3/I reliable?
The price and inventory of SM8S22CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S22CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S22CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22CAHM3/I?
SM8S22CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22CAHM3/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 SM8S22CAHM3/I?
For technical support, including SM8S22CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22CAHM3/I requirements.
6.How does Aetrix verify that SM8S22CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S22CAHM3/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 SM8S22CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S22CAHM3/I?
All SM8S22CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22CAHM3/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 SM8S22CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S22CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S22CAHM3/I Tags
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