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Vishay General Semiconductor - Diodes Division SM8S30CAHM3/I
- Part No.:
- SM8S30CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S30CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,745
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Product details
Overview
SM8S30CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, with 33.3 V min / 35.1 V nominal breakdown voltage, 30 V stand-off voltage, 48.4 V max clamping voltage at 136 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and rated for automotive load dump protection up to TJ = 175 °C.
For engineers reviewing the SM8S30CAHM3/I datasheet, SM8S30CAHM3/I pinout, SM8S30CAHM3/I application, or SM8S30CAHM3/I equivalent, this device serves as a high-reliability, high-surge-capability TVS for 12 V/24 V automotive power rail protection where low leakage (<10 μA at VWM), ISO 7637-2 compliance, and MSL Level 1 handling are required.
Technical Context
This TVS operates as a voltage-clamping overvoltage protection device across bidirectional signal or power lines, triggered when reverse voltage exceeds its breakdown threshold. Its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.35 °C/W) and high-power dissipation capability.
The SM8S30CAHM3/I delivers 6600 W peak pulse power under 10/1000 μs waveform and maintains stable clamping performance up to +175 °C junction temperature, meeting ISO 16750-2 surge requirements for automotive electronics. Its 30 V stand-off voltage ensures compatibility with nominal 24 V systems while avoiding false triggering during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 33.3 / 35.1 / 36.8 V - Ensures reliable turn-on above system operating voltage while accommodating manufacturing tolerance |
| VWM | 30 V - Maximum continuous reverse voltage before leakage rises; matches 24 V automotive rail with margin |
| VC @ IPPM | 48.4 V - Clamping voltage at 136 A limits downstream IC stress during load dump transients |
| PPPM (10/1000 μs) | 6600 W - Sustains high-energy surges per ISO 7637-2 Pulse 5a without failure |
| IPPM | 136 A - Peak surge current capacity enables robust protection of ECUs, body controllers, and ADAS modules |
| TJ max | +175 °C - Supports under-hood placement in modern automotive environments |
| Leakage @ VWM, 25 °C | <10 μA - Minimizes standby power loss in always-on vehicle networks |
Pinout & Package
DO-218AC package with two terminals: Lead 1 (anode/cathode indeterminate due to bidirectionality) and Lead 2/Metal Heatsink (common thermal and electrical path). Matte tin-plated leads meet J-STD-002 solderability; halogen-free, RoHS-compliant, and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Cathode (bidirectional) | No polarity marking; connects to protected line on either side of clamp node |
| Lead 2 / Metal Heatsink | Common reference & thermal path | Low-inductance, low-resistance connection to PCB ground plane or heatsink for surge energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or dual-polarity rails (e.g., CAN, LIN, sensor inputs) without polarity constraints |
| AEC-Q101 qualification | Validated reliability for automotive production use including temperature cycling, HTRB, and ESD testing |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns (peak 245 °C) |
| ISO 7637-2 & ISO 16750-2 compliance | Meets OEM-level surge immunity requirements for 12 V/24 V vehicle electrical systems |
| RθJM = 0.35 °C/W | Enables efficient heat transfer from junction to mounting surface, supporting sustained surge duty cycles |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Supply Rail |
|---|---|
Use Scenario: Protects ECU main 12 V input against load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Primary clamping TVS placed upstream of DC/DC converter and LDO regulators. Use Value: Limits transient voltage to ≤48.4 V at 136 A, preventing damage to MCU, CAN transceivers, and analog front-ends. | Use Scenario: Shields BCM power supply from battery disconnection/reconnection spikes and relay switching noise. IC Role / Device Role / Timing Role: Standoff-rated (30 V) TVS absorbing repetitive 50–100 ms surges up to 6600 W. Use Value: Maintains <10 μA leakage at 30 V to avoid battery drain in sleep mode while surviving >1000 surge events. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards 12 V camera module input against ignition-induced transients and ESD coupling. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) clamping element co-located with input filter capacitor. Use Value: Clamps within 1 ns to 48.4 V, preserving image sensor integrity and preventing false frame drops during road vibration events. | Use Scenario: Guards H-bridge driver IC supply against inductive kickback from motor phase switching. IC Role / Device Role / Timing Role: High-current (136 A) bidirectional TVS shunting energy into chassis ground via metal heatsink terminal. Use Value: Leverages RθJM = 0.35 °C/W to sustain repeated 10/1000 μs surges without thermal runaway in EPS control units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CAHE3/5BT | DO-214AC package; lower PPPM (400 W); VC = 48.4 V at 59.3 A; RθJA = 95 °C/W | Not AEC-Q101 qualified; limited to industrial/commercial use; unsuitable for under-hood automotive | Select only for cost-sensitive non-automotive designs with lower surge energy requirements |
| TPSMD30CA | DO-218AC package; same VWM/VC; PPPM = 6600 W; AEC-Q101 qualified; but VBR min = 31.5 V (wider tolerance) | Higher initial leakage (≤50 μA at VWM) and no MSL Level 1 rating | Acceptable for automotive use where tighter VBR tolerance and moisture robustness are not critical |
Compared with SMAJ30CAHE3/5BT and TPSMD30CA, the SM8S30CAHM3/I offers superior thermal performance (RθJM = 0.35 °C/W), guaranteed low leakage (<10 μA), and full MSL Level 1 process compatibility-making it the preferred choice for high-reliability automotive power rail protection where surge repetition and long-term stability are essential.
Availability
SM8S30CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, and electric power steering system design requiring stable component supply, AEC-Q101 traceability, and ISO 7637-2 compliance.
Supply support for SM8S30CAHM3/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 SM8S series is part of Vishay's PAR® TVS platform designed specifically for high-energy automotive load dump and surge protection, emphasizing AEC-Q101 qualification, high-temperature operation, and DO-218AC thermal efficiency.
FAQ
What is the maximum clamping voltage of the SM8S30CAHM3/I at its rated peak pulse current?
The SM8S30CAHM3/I has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 136 A under a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of the Vishay datasheet (Doc #98229) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SM8S30CAHM3/I maintains this clamping performance across its full operating temperature range up to +175 °C.
Is the SM8S30CAHM3/I suitable for automotive under-hood applications?
Yes, the SM8S30CAHM3/I is explicitly qualified for automotive under-hood use: it is AEC-Q101 certified, rated for TJ = -55 °C to +175 °C, meets ISO 7637-2 and ISO 16750-2 surge standards, and features MSL Level 1 moisture sensitivity. Its DO-218AC package with metal heatsink terminal provides low thermal resistance (RθJM = 0.35 °C/W), enabling reliable operation in high-ambient-temperature engine bay environments. The SM8S30CAHM3/I is designed for this exact application class.
Does the SM8S30CAHM3/I have polarity markings on the package?
No, the SM8S30CAHM3/I is a bidirectional TVS diode and carries no cathode band or polarity marking on the DO-218AC case. Its symmetrical construction allows installation in either orientation across the protected line and return path. This eliminates orientation errors during automated assembly and simplifies layout for differential or AC-coupled circuits. The SM8S30CAHM3/I functions identically regardless of terminal connection direction.
What is the standoff voltage rating of the SM8S30CAHM3/I, and why does it matter?
The SM8S30CAHM3/I has a maximum reverse stand-off voltage (VWM) of 30 V, meaning it remains in high-impedance state with leakage <10 μA up to this voltage. This rating ensures compatibility with nominal 24 V automotive systems while providing sufficient margin above normal operating voltage to prevent false triggering during load variations or ripple. Selecting a TVS with appropriate VWM is critical-too low causes excessive leakage; too high risks insufficient clamping. The SM8S30CAHM3/I strikes this balance for 24 V rail protection.
How does the DO-218AC package of the SM8S30CAHM3/I improve thermal performance compared to DO-214AC?
The DO-218AC package of the SM8S30CAHM3/I integrates a large metal heatsink terminal that reduces thermal resistance from junction to mount (RθJM) to just 0.35 °C/W-over 2.5× lower than typical DO-214AC devices (~0.9–1.0 °C/W). This enables faster heat transfer to the PCB ground plane or external heatsink, sustaining higher surge repetition rates and improving long-term reliability in thermally demanding automotive applications. The SM8S30CAHM3/I leverages this structural advantage for consistent 6600 W surge handling.
SM8S30CAHM3/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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 136A
- 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
SM8S30CAHM3/I FAQ
1.How can I place an order for SM8S30CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S30CAHM3/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 SM8S30CAHM3/I reliable?
The price and inventory of SM8S30CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S30CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S30CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S30CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S30CAHM3/I?
SM8S30CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S30CAHM3/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 SM8S30CAHM3/I?
For technical support, including SM8S30CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S30CAHM3/I requirements.
6.How does Aetrix verify that SM8S30CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S30CAHM3/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 SM8S30CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S30CAHM3/I?
All SM8S30CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S30CAHM3/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 SM8S30CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S30CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S30CAHM3/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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