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Vishay General Semiconductor - Diodes Division SM6A27HM3/I
- Part No.:
- SM6A27HM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6A27HM3/I.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,051
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Product details
Overview
SM6A27HM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor optimized for automotive load dump protection, featuring 27 V breakdown voltage (VBR = 24–30 V at 10 mA), 4600 W peak pulse power (10/1000 μs), 22 V working stand-off voltage (VWM), and AEC-Q101 qualification for under-hood reliability up to TJ = 175 °C.
For engineers reviewing the SM6A27HM3/I datasheet, SM6A27HM3/I pinout, SM6A27HM3/I application, or SM6A27HM3/I equivalent, this device delivers high-surge robustness in DO-218AC packaging with verified ISO 7637-2 compliance, low leakage (<0.5 μA at 25 °C), and clamping voltage ≤40.0 V at 65 A - critical for 12 V automotive power rail transient suppression.
Technical Context
The SM6A27HM3/I employs passivated anisotropic rectifier technology to achieve stable junction behavior across -55 °C to +175 °C, enabling operation in high-temperature engine bay environments. Its unidirectional polarity configures the metal heatsink as anode, supporting direct thermal coupling to PCB copper planes.
It meets MSL Level 1 per J-STD-020 with 245 °C lead-free reflow tolerance and delivers 90 A peak pulse current (IPPM) with 3600 W capability under 10/10 000 μs waveform - aligning with extended-duration load dump transients defined in ISO 7637-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 24 V / 30 V at 10 mA - defines precise clamping onset threshold for reliable overvoltage triggering |
| VWM | 22 V - maximum continuous reverse voltage before leakage exceeds 0.5 μA at 25 °C |
| PPPM (10/1000 μs) | 4600 W - sustains automotive load dump surges without degradation |
| IPPM | 90 A - peak transient current handling capacity under standardized surge waveform |
| TJ max. | +175 °C - enables placement near heat sources in AEC-Q101-compliant automotive modules |
| RθJM | 0.45 °C/W - low junction-to-mount thermal resistance supports efficient heat transfer to heatsink or PCB |
| Clamping voltage VC | ≤40.0 V at IPP = 65 A - ensures protected ICs remain below absolute maximum ratings during surge |
Pinout & Package
Package: DO-218AC - thermally enhanced surface-mount case with metal heatsink (anode) and molded body meeting UL 94 V-0; footprint compliant with IPC-7351 standard; matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | Current entry point during forward conduction; primary thermal path | Must be soldered to large copper area or external heatsink for RθJM = 0.45 °C/W performance |
| Cathode (Lead 1) | Current exit point during reverse-biased clamping | Connected to protected line (e.g., battery rail); defines polarity of transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ISO 7637-2 compliance | Guarantees survivability against standardized automotive load dump and switching transients |
| MSL Level 1 rating | Enables single-pass lead-free reflow at 245 °C without moisture-induced damage |
| Low VF (0.94 V at 100 A) | Minimizes forward conduction loss during high-current fault conditions |
| Halogen-free, RoHS-compliant (M3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Suppresses 12 V battery rail transients caused by alternator field-circuit interruption during engine run. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps surge to ≤40.0 V at 65 A while maintaining VWM = 22 V - prevents overvoltage damage to downstream PMICs and microcontrollers. |
Use Scenario: Protects ECU main power supply from inductive kickback generated by fuel injector or solenoid drivers. IC Role / Device Role / Timing Role: Primary transient suppressor on 12 V input rail upstream of LDO regulators and MCU power domains. Use Value: Withstands 90 A IPPM and 4600 W PPPM, ensuring immunity to repetitive switching transients in harsh under-hood environments. |
| Body Control Module (BCM) Power Interface | ADAS Camera Power Supply |
Use Scenario: Shields BCM power inputs from relay coil de-energization spikes and LIN bus coupling noise. IC Role / Device Role / Timing Role: Standoff-rated TVS on fused 12 V feed to microcontroller and CAN transceiver power rails. Use Value: Low leakage (<0.5 μA at 25 °C) avoids parasitic drain; 175 °C TJ max supports sealed module operation without derating. |
Use Scenario: Safeguards 12 V input to image sensor power management ICs in front-facing ADAS cameras exposed to vehicle-level surges. IC Role / Device Role / Timing Role: First-line transient defense before buck converters supplying 3.3 V/1.8 V camera SoCs. Use Value: DO-218AC package provides superior thermal dissipation vs. SMA/SMB, critical for compact, sealed camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ27A | Lower PPPM (400 W), SMA package, no AEC-Q101 qualification, RθJA = 110 °C/W | Rated for commercial/industrial use only; unsuitable for under-hood automotive deployment | Select when cost sensitivity outweighs automotive qualification and thermal performance requirements |
| 1.5KE27A | Through-hole DO-201 package, higher VF (~1.2 V), no MSL Level 1 or AEC-Q101 rating | Limited to non-automotive, non-reflow production; incompatible with automated SMT assembly | Choose only for legacy through-hole designs where board space and reflow compatibility are not constraints |
Compared with SMAJ27A and 1.5KE27A, the SM6A27HM3/I uniquely combines AEC-Q101 qualification, DO-218AC thermal efficiency (RθJM = 0.45 °C/W), and 4600 W surge rating - making it the sole option qualified for modern automotive SMT power rail protection requiring zero derating at 175 °C.
Availability
SM6A27HM3/I is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) power input, and body control module (BCM) power interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SM6A27HM3/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 SM6A27HM3/I belongs to Vishay's PAR® (Protected Automotive Rectifier) family - engineered specifically for under-hood automotive transient suppression with emphasis on thermal stability, surge endurance, and AEC-Q101 compliance.
FAQ
What is the polarity configuration of the SM6A27HM3/I?
The SM6A27HM3/I is a unidirectional TVS diode with the metal heatsink serving as the anode terminal and Lead 1 as the cathode. This configuration requires correct orientation during PCB layout to ensure proper clamping action on positive-going transients applied to the protected line. The SM6A27HM3/I datasheet explicitly states "Polarity: heatsink is anode", and its DO-218AC mechanical drawing confirms the anode is the large metal base plate.
Does the SM6A27HM3/I meet ISO 7637-2 requirements?
Yes, the SM6A27HM3/I is specified to meet ISO 7637-2 surge test requirements, as confirmed in the Vishay datasheet Document Number 98644 under "FEATURES". This certification validates its ability to withstand standardized automotive electrical transients, including load dump pulses, making the SM6A27HM3/I suitable for 12 V vehicle power network protection.
What is the maximum junction temperature rating for the SM6A27HM3/I?
The SM6A27HM3/I has a maximum operating junction temperature (TJ) of +175 °C, as stated in both the PRIMARY CHARACTERISTICS table and MAXIMUM RATINGS section of its official datasheet. This rating enables reliable operation in high-temperature automotive environments such as engine compartments, and the SM6A27HM3/I is explicitly qualified to AEC-Q101 under these thermal conditions.
Is the SM6A27HM3/I compatible with lead-free reflow processes?
Yes, the SM6A27HM3/I is rated for MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 245 °C, fully compatible with standard lead-free soldering profiles. Its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102, and the HM3 suffix confirms halogen-free, RoHS-compliant construction - all verified in the Vishay SM6A27HM3/I datasheet revision 11-Aug-2025.
How does the SM6A27HM3/I differ from standard SMAJ-series TVS diodes?
The SM6A27HM3/I differs from SMAJ-series devices in three key ways: it uses the thermally superior DO-218AC package (RθJM = 0.45 °C/W vs. ~110 °C/W for SMAJ), carries AEC-Q101 qualification, and delivers 4600 W PPPM - over 11× higher than the 400 W rating of SMAJ27A. These distinctions make the SM6A27HM3/I suitable for demanding automotive applications where the SMAJ27A would thermally saturate or fail qualification.
SM6A27HM3/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 (Max)
- Voltage - Breakdown (Min):
- 24V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 65A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
SM6A27HM3/I FAQ
1.How can I place an order for SM6A27HM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6A27HM3/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 SM6A27HM3/I reliable?
The price and inventory of SM6A27HM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6A27HM3/I is usually 5 days.
3.What payment methods are accepted for SM6A27HM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6A27HM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6A27HM3/I?
SM6A27HM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6A27HM3/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 SM6A27HM3/I?
For technical support, including SM6A27HM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6A27HM3/I requirements.
6.How does Aetrix verify that SM6A27HM3/I is sourced from the original manufacturer or authorized distributors?
All SM6A27HM3/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 SM6A27HM3/I meets industry standards.
7.What is the process for return or replacement of SM6A27HM3/I?
All SM6A27HM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6A27HM3/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 SM6A27HM3/I part is unused and in its original packaging.
Return procedure for SM6A27HM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6A27HM3/I Tags
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