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Vishay General Semiconductor - Diodes Division SM8S30AHM3/I
- Part No.:
- SM8S30AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S30AHM3/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,505
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Product details
Overview
SM8S30AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 5 mA, 48.4 V clamping voltage (VC) at 136 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Its DO-218AB package supports TJ = 175 °C operation and AEC-Q101 qualification.
For engineers reviewing the SM8S30AHM3/I datasheet, SM8S30AHM3/I pinout, SM8S30AHM3/I application, or SM8S30AHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where low leakage (<10 μA at VWM), high surge robustness, and ISO7637-2 compliance are critical design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive transients while maintaining low forward voltage drop (≤1.8 V at 100 A) and minimal junction capacitance (~1000 pF at VWM). Its thermal design targets low RθJM (0.35 °C/W) via metal heatsink integration in the DO-218AB case.
The device operates exclusively in unidirectional mode with anode-connected heatsink configuration. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing - confirming suitability for lead-free reflow and long-term automotive under-hood deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V automotive systems. |
| VBR (min/typ/max) | 33.3 / 35.1 / 36.8 V at 5 mA - Ensures reliable triggering above nominal battery voltage during load dump events. |
| VC @ IPPM | 48.4 V at 136 A (10/1000 μs) - Limits downstream IC stress to <50 V during worst-case surges. |
| PPPM | 6600 W (10/1000 μs) - Supports high-energy ISO7637-2 Pulse 5a load dump suppression without failure. |
| TJ max | 175 °C - Enables placement near hot engine control units without derating concerns. |
| Leakage ID | <10 μA at VWM, 25 °C - Minimizes standby power loss in always-on vehicle modules. |
| AEC-Q101 | Qualified - Confirms reliability for automotive electronic control units per stress test standard. |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-heatsink configuration with matte tin-plated terminals solderable per J-STD-002. Meets UL 94 V-0 flammability rating and RoHS-compliant (E3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current return path and thermal interface | Must be connected to large copper pour or chassis ground for effective heat dissipation and clamping performance. |
| Cathode | Transient voltage sensing and clamping node | Connected to protected line (e.g., battery feed); conducts surge current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable VBR drift <±5 % over lifetime under 175 °C thermal cycling. |
| Low forward voltage drop | ≤1.8 V at 100 A pulse ensures minimal conduction loss during high-current clamping. |
| ISO7637-2 compliance | Validated for Pulse 5a (load dump) up to 6600 W, eliminating need for external waveform shaping. |
| MSL Level 1 rating | Allows single-pass 245 °C lead-free reflow without popcorn or delamination risk. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-humidity under-hood environments over 15+ year service life. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and sensors from 12 V battery line transients during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between battery input and primary DC/DC converter input. Use Value: Clamps surge to ≤48.4 V within nanoseconds, preventing latch-up or permanent damage to 5 V/3.3 V logic rails downstream. |
Use Scenario: Shields door module, lighting drivers, and LIN transceivers from switching noise and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage protection on fused 12 V supply branch feeding multiple sub-modules. Use Value: Withstands ≥136 A peak pulses without degradation, ensuring multi-year field reliability in production BCM assemblies. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards image sensor and ISP power inputs against ESD and conducted transients in front-end camera modules. IC Role / Device Role / Timing Role: Secondary TVS stage after bulk filtering, placed adjacent to camera PMIC input. Use Value: Low leakage (<10 μA) avoids signal integrity impact on analog video paths; 175 °C rating supports hood-mounted placement. |
Use Scenario: Protects gate drivers and MCU power supplies from motor regeneration spikes and battery reversal events. IC Role / Device Role / Timing Role: High-power TVS mounted directly on EPS main PCB near H-bridge power stage. Use Value: 6600 W peak power rating absorbs repeated 10 ms exponential load dump waveforms per ISO7637-2 without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHE3/A | Lower PPPM (400 W), smaller SMA package, 30 V VWM, but only rated to TJ = 150 °C. | Not qualified to AEC-Q101; limited to non-safety-critical consumer or industrial use. | Select when cost or board space is prioritized over automotive-grade surge endurance. |
| SM8S33AHM3/I | Higher VWM (33 V), VBR 36.7–40.6 V, VC = 53.3 V at 124 A; identical DO-218AB package and AEC-Q101 qualification. | Better margin for 24 V commercial vehicle systems; slightly reduced peak current handling vs. SM8S30AHM3/I. | Choose for dual-voltage platforms requiring one footprint across 12 V and 24 V variants. |
Compared with SMAJ30AHE3/A and SM8S33AHM3/I, the SM8S30AHM3/I delivers optimal balance of 12 V automotive load dump capability, 175 °C junction rating, and AEC-Q101 validation - making it the preferred choice for ECU and BCM designs demanding full ISO7637-2 compliance.
Availability
SM8S30AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, and advanced driver assistance systems requiring stable component supply with full AEC-Q101 traceability and long-lifecycle support.
Supply support for SM8S30AHM3/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 protection devices for automotive, industrial, and computing markets.
The SM8S series is part of Vishay's PAR® TVS platform engineered specifically for automotive-grade transient suppression - emphasizing high-temperature stability, ISO7637-2 compliance, and AEC-Q101 qualification from wafer to final test.
FAQ
What is the clamping voltage of the SM8S30AHM3/I at its rated peak pulse current?
The SM8S30AHM3/I has a maximum clamping voltage (VC) of 48.4 V when subjected to a 136 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions and ensures downstream components remain below their absolute maximum voltage ratings during load dump events. The SM8S30AHM3/I maintains this clamping performance across its full operating temperature range up to TJ = 175 °C.
Is the SM8S30AHM3/I suitable for 24 V automotive systems?
No - the SM8S30AHM3/I is optimized for 12 V nominal systems with a 30 V stand-off voltage (VWM) and 33.3–36.8 V breakdown range. For 24 V applications, Vishay recommends the SM8S33AHM3/I (VWM = 33 V) or SM8S36AHM3/I (VWM = 36 V), which provide appropriate voltage margins while retaining identical DO-218AB packaging and AEC-Q101 qualification as the SM8S30AHM3/I.
Does the SM8S30AHM3/I have polarity markings on the package?
Yes - the SM8S30AHM3/I uses the DO-218AB package with cathode identified by a band marking on the molded body. The metal heatsink serves as the anode terminal, and polarity must be observed during PCB layout to ensure correct connection to the protected line (cathode) and system ground/chassis (anode/heatsink). Incorrect orientation will prevent proper clamping operation.
What is the thermal resistance from junction to heatsink (RθJM) for the SM8S30AHM3/I?
The SM8S30AHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.35 °C/W when mounted per JEDEC 51-14 using the Transient Dual Interface Method. This low value reflects the direct metal heatsink construction of the DO-218AB case and enables efficient heat transfer to the PCB copper pour or chassis, supporting sustained operation at TJ = 175 °C. The SM8S30AHM3/I requires adequate thermal pad area per Vishay's recommended footprint.
How does the SM8S30AHM3/I meet ISO7637-2 compliance?
The SM8S30AHM3/I is validated to withstand ISO7637-2 Pulse 5a (load dump) waveforms - specifically the 10 ms exponential test profile - with no parameter shift or failure at rated energy levels. Its 6600 W peak pulse power rating (10/1000 μs) and 5200 W rating (10/10,000 μs) exceed minimum requirements for Class III/IV automotive systems. Compliance is confirmed through Vishay's internal test reports aligned with ISO7637-2 Annex A.
SM8S30AHM3/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):
- 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-218AC
SM8S30AHM3/I FAQ
1.How can I place an order for SM8S30AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S30AHM3/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 SM8S30AHM3/I reliable?
The price and inventory of SM8S30AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S30AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S30AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S30AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S30AHM3/I?
SM8S30AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S30AHM3/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 SM8S30AHM3/I?
For technical support, including SM8S30AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S30AHM3/I requirements.
6.How does Aetrix verify that SM8S30AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S30AHM3/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 SM8S30AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S30AHM3/I?
All SM8S30AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S30AHM3/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 SM8S30AHM3/I part is unused and in its original packaging.
Return procedure for SM8S30AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S30AHM3/I Tags
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