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Vishay General Semiconductor - Diodes Division SM8S75CAHM3/I
- Part No.:
- SM8S75CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S75CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
SM8S75CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR), 121 V maximum clamping voltage (VC) at 54.5 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified for under-hood electronics.
For engineers reviewing the SM8S75CAHM3/I datasheet, SM8S75CAHM3/I pinout, SM8S75CAHM3/I application, or SM8S75CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where ISO 7637-2 and ISO 16750-2 surge compliance, low leakage (<10 μA at VWM), and DO-218AC thermal performance are critical.
Technical Context
This TVS diode uses a planar junction structure with RoHS-compliant, halogen-free molding compound in a DO-218AC package. Its bidirectional configuration enables symmetrical clamping without polarity sensitivity, and its 0.35 °C/W junction-to-mount thermal resistance supports direct metal heatsink mounting for sustained surge handling.
The device delivers 6600 W peak pulse power under 10/1000 μs waveform and maintains stable clamping up to TJ = 175 °C - validated per AEC-Q101 stress testing including temperature cycling, HTRB, and ESD. It meets MSL Level 1 and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - reverse stand-off voltage; defines maximum continuous operating voltage before significant conduction begins |
| VBR min/max | 83.3 V / 92.1 V - breakdown voltage range at 5 mA test current; ensures predictable turn-on during transients |
| VC @ IPPM | 121 V at 54.5 A - clamping voltage limits downstream IC stress during 10/1000 μs surges |
| PPPM (10/1000 μs) | 6600 W - peak pulse power rating; supports high-energy load dump events per ISO 7637-2 |
| TJ max | +175 °C - extended junction temperature rating enables placement near hot engine components |
| ID @ VWM | <10 μA at 25 °C - ultra-low leakage preserves battery life in always-on automotive modules |
| RθJM | 0.35 °C/W - low junction-to-mount thermal resistance allows efficient heat transfer to PCB copper or metal heatsink |
Pinout & Package
Package: DO-218AC - surface-mount, bidirectional, no cathode band, matte tin-plated terminals, halogen-free, AEC-Q101 qualified, MSL Level 1, 245 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode (bidirectional terminal) | One side of the symmetrical avalanche junction; connects to protected line (e.g., battery rail) |
| Lead 2 / Metal Heatsink | Cathode / Thermal Pad | Second terminal and primary thermal path; must be soldered to large copper area or metal chassis for RθJM optimization |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or polarity-agnostic DC rails without orientation constraints |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules under harsh thermal and vibration conditions |
| ISO 7637-2 & ISO 16750-2 compliance | Guarantees robustness against real-world automotive transients including load dump, jump start, and alternator ripple |
| DO-218AC thermal design | Integrated metal heatsink pad reduces thermal impedance by >90% vs. standard SMC packages, enabling higher surge repetition rates |
| Halogen-free, RoHS-compliant construction | Meets global environmental regulations and supports lead-free assembly while maintaining UL 94 V-0 flammability rating |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 12 V supply input of engine management systems exposed to alternator load dump pulses up to 35 V for 400 ms. IC Role / Device Role: Primary overvoltage clamp on main battery rail, placed upstream of DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 121 V during 6600 W surges, preventing damage to 40 V-rated input stages and ensuring ASIL-B functional safety compliance. | Use Scenario: Safeguarding LIN bus power and I/O lines in door modules subject to cable discharge events and ESD. IC Role / Device Role: Secondary surge suppression at local power entry points, complementing upstream TVS and filtering networks. Use Value: Sub-10 μA leakage at 75 V minimizes quiescent current draw in sleep mode, extending vehicle battery life during extended parking. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Control Board |
Use Scenario: Securing 5 V/3.3 V camera module power derived from buck converters fed by 12 V battery rail. IC Role / Device Role: Point-of-load transient suppression directly at converter input, reducing layout parasitics and clamping overshoot. Use Value: 175 °C junction rating allows placement adjacent to power inductors without derating, maintaining full 6600 W surge capability at elevated ambient temperatures. | Use Scenario: Protecting motor driver gate drivers and MCU supply against inductive kickback from 3-phase BLDC motor windings. IC Role / Device Role: High-power bidirectional clamp on high-side and low-side power rails, mounted to aluminum heatsink via metal pad. Use Value: 0.35 °C/W RθJM enables >5× longer surge endurance than SMC packages under repeated 10/1000 μs pulses, improving EPS system durability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA | Lower PPPM (400 W), SMA package, RθJA = 100 °C/W, not AEC-Q101 qualified | Suitable for cost-sensitive industrial controls but lacks automotive surge margin and thermal performance | Select SMAJ75CA only for non-automotive, low-duty-cycle applications where space and cost outweigh reliability requirements |
| TPSMD75CA | Same DO-218AC package, 6600 W rating, but VWM = 75 V, VC = 122 V, and AEC-Q101 qualified - functionally identical clamping behavior | Drop-in replacement with identical footprint, thermal profile, and automotive qualification; minor manufacturer-specific process variation | TPSMD75CA offers same electrical and mechanical performance with alternate sourcing; verify reel packaging and traceability requirements |
Compared with SMAJ75CA, SM8S75CAHM3/I delivers 16.5× higher surge power and automotive-grade reliability; versus TPSMD75CA, it provides equivalent protection with Vishay's PAR® technology and documented ISO 7637-2 validation - making it optimal for safety-critical 12 V/24 V vehicle subsystems.
Availability
SM8S75CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera modules, electric power steering systems, and body control modules requiring stable component supply across long production lifecycles.
Supply support for SM8S75CAHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified solutions.
The SM8SxxCA family is engineered specifically for high-energy automotive transient suppression, combining DO-218AC thermal efficiency with AEC-Q101 validation and ISO 7637-2 compliance to address modern vehicle electrical architecture demands.
FAQ
What is the maximum clamping voltage of the SM8S75CAHM3/I under a 10/1000 μs surge?
The SM8S75CAHM3/I has a maximum clamping voltage (VC) of 121 V when subjected to its rated peak pulse current of 54.5 A under the standardized 10/1000 μs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc #98229) and ensures downstream components see limited overvoltage stress during load dump events. The SM8S75CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM8S75CAHM3/I suitable for 24 V commercial vehicle applications?
Yes, the SM8S75CAHM3/I is explicitly validated for 24 V systems: its 75 V stand-off voltage provides adequate margin above nominal 24 V rails (typically 28 V max), and its 121 V clamping voltage remains within safe limits for 36 V-rated downstream circuitry. The device meets ISO 16750-2 Pulse 5a/b for 24 V vehicles and is used in heavy-duty truck ECUs and trailer control units. SM8S75CAHM3/I's 175 °C rating further supports under-hood deployment in commercial platforms.
Does the SM8S75CAHM3/I require a heatsink for standard automotive operation?
No discrete heatsink is required for single-event surge protection, as the DO-218AC package's metal heatsink terminal is designed to transfer heat directly into PCB copper planes or chassis mounts. However, for repetitive surge conditions (e.g., frequent load dumps), thermal design must follow JEDEC 51-14 guidelines using the specified 0.35 °C/W RθJM value. Proper pad layout per IPC-7351 is essential - the SM8S75CAHM3/I relies on board-level copper mass, not external heatsinks, for thermal management.
How does the HM3 suffix affect the SM8S75CAHM3/I's compliance status?
The HM3 suffix on SM8S75CAHM3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads, AEC-Q101 qualification, and JESD 201 Class 2 whisker resistance. "H" denotes AEC-Q101 qualification, "M3" specifies halogen-free, Pb-free, and RoHS-compliant materials. This suffix confirms full automotive suitability - unlike base SM8S75CA variants without HM3, the SM8S75CAHM3/I is approved for safety-critical vehicle subsystems per OEM requirements.
Can the SM8S75CAHM3/I replace older SM8S75A or SMAJ75CA parts in existing designs?
The SM8S75CAHM3/I is not a direct drop-in for SM8S75A (which lacks AEC-Q101 and HM3 environmental specs) or SMAJ75CA (SMA package, 400 W rating). While electrical parameters align, the DO-218AC footprint, 6600 W surge capacity, and thermal performance of SM8S75CAHM3/I require PCB layout review. For legacy designs, SM8S75CAHM3/I offers superior protection but mandates verification of pad geometry, thermal relief, and reflow profile compatibility.
SM8S75CAHM3/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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 54.5A
- 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
SM8S75CAHM3/I FAQ
1.How can I place an order for SM8S75CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S75CAHM3/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 SM8S75CAHM3/I reliable?
The price and inventory of SM8S75CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S75CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S75CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S75CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S75CAHM3/I?
SM8S75CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S75CAHM3/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 SM8S75CAHM3/I?
For technical support, including SM8S75CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S75CAHM3/I requirements.
6.How does Aetrix verify that SM8S75CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S75CAHM3/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 SM8S75CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S75CAHM3/I?
All SM8S75CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S75CAHM3/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 SM8S75CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S75CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S75CAHM3/I Tags
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