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Vishay General Semiconductor - Diodes Division SM8A27HM3/I
- Part No.:
- SM8A27HM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8A27HM3/I.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,921
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Product details
Overview
SM8A27HM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor designed for automotive load dump protection. It features a 27 V breakdown voltage (VBR = 24–30 V), 6600 W peak pulse power (10/1000 μs), 130 A peak pulse current, 22 V working voltage (VWM), and AEC-Q101 qualification for under-hood reliability up to TJ = 175 °C.
For engineers reviewing the SM8A27HM3/I datasheet, SM8A27HM3/I pinout, SM8A27HM3/I application, or SM8A27HM3/I equivalent, this device serves as a high-surge-capability, low-leakage TVS diode optimized for ISO 7637-2 compliance in 12 V automotive power systems with strict thermal and reliability requirements.
Technical Context
The SM8A27HM3/I uses passivated anisotropic rectifier technology to achieve stable clamping at elevated junction temperatures. Its DO-218AC package integrates a metal heatsink anode and supports direct PCB mounting with RθJM = 0.35 °C/W for efficient thermal transfer to the board or external heatsink.
It delivers 40.0 V clamping voltage at 75 A (10 μs/10 ms waveform) and maintains ≤1.0 μA reverse leakage at 22 V and 25 °C - critical for low-power standby circuits. The device meets MSL Level 1 and JESD201 Class 2 whisker resistance, confirming robustness for automated assembly and long-term automotive deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 24 V / 30 V - ensures reliable triggering above 22 V system nominal while accommodating manufacturing tolerance and temperature drift |
| VWM | 22 V - maximum continuous reverse voltage before significant leakage; matches 12 V automotive battery + load dump margin |
| PPPM (10/1000 μs) | 6600 W - sustains high-energy transients like ISO 7637-2 Pulse 5a without failure |
| IPPM | 130 A - peak surge current handling capacity directly supports load dump energy absorption |
| TJ max | +175 °C - enables placement near hot engine control units without derating penalties |
| RθJM | 0.35 °C/W - low junction-to-mount thermal resistance allows effective heat sinking via PCB copper or chassis contact |
| Clamping VC @ 75 A | ≤40.0 V - limits downstream IC stress during worst-case surge events per ISO 7637-2 |
Pinout & Package
Package: DO-218AC - molded surface-mount case with integral metal heatsink terminal; anode connected to heatsink, cathode on lead 1; UL 94 V-0 rated compound; RoHS-compliant, halogen-free (M3), matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Cathode connection | Standard TVS polarity input; connects to protected line (e.g., battery rail); reverse-biased during clamping |
| Lead 2 / Metal Heatsink (anode) | Anode connection | Primary thermal path and electrical return; must be soldered to large copper pour or chassis for RθJM performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JEDEC standards |
| Junction passivation | Stable VBR and low IR across -55 °C to +175 °C; prevents parametric shift in harsh environments |
| Low forward voltage (0.93 V @ 100 A) | Minimizes conduction loss during bidirectional surge events; improves efficiency in clamp-and-dump paths |
| MSL Level 1 rating | Enables standard reflow without moisture-related popcorn failure; no bake required prior to assembly |
| ISO 7637-2 compliance | Guarantees survivability against load dump pulses (Pulse 5a) up to 6600 W without degradation |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Clamping |
|---|---|
Use Scenario: Protects microcontroller power rails from 12 V battery load dump surges during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity transients to <40 V within nanoseconds, preventing latch-up or overvoltage damage to LDOs and MCUs. Use Value: Enables single-device protection meeting ISO 7637-2 Pulse 5a with no external series impedance or timing components. |
Use Scenario: Shields BCM power inputs from switching transients induced by relay-driven lighting and HVAC loads. IC Role / Device Role / Timing Role: Absorbs repetitive 10/1000 μs surges up to 130 A while maintaining <1 μA leakage at 22 V for low-quiescent-current design. Use Value: Eliminates need for parallel TVS arrays; DO-218AC heatsink interface sustains 8 W continuous dissipation at ambient. |
| Automotive Infotainment Power Supply Protection | ADAS Camera Module Input Protection |
Use Scenario: Guards USB-C PD and PMIC inputs in head units against battery line transients during cold-cranking and jump-starts. IC Role / Device Role / Timing Role: Provides fast-response clamping (<1 ns) with low VF (0.93 V @ 100 A) to avoid voltage droop during high-current surges. Use Value: Maintains stable 5 V/3.3 V rail operation without brownout during 100 A transient events. |
Use Scenario: Safeguards image sensor and SerDes power lines in rear-view and surround-view cameras exposed to under-hood EMI. IC Role / Device Role / Timing Role: Suppresses ESD and inductive spikes while operating continuously at TJ = 150 °C near engine bay heat sources. Use Value: Delivers guaranteed 175 °C junction capability and <50 μA leakage at 175 °C - essential for sealed camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ27A | Lower PPPM (400 W), DO-214AC package, RθJA = 50 °C/W, no AEC-Q101 qualification | Rated for industrial/commercial use only; insufficient for automotive load dump | Select only for non-automotive 22 V systems where surge energy ≤400 W |
| TPSMD27 | Same DO-218AC package, 6600 W rating, but VBR = 28.9–31.9 V and VWM = 24.5 V; not AEC-Q101 qualified | Higher VWM reduces margin for 12 V nominal systems; lacks automotive reliability validation | Consider only if higher stand-off voltage is required and AEC-Q101 is not mandated |
Compared with SMAJ27A and TPSMD27, the SM8A27HM3/I uniquely combines AEC-Q101 qualification, 6600 W surge rating, 22 V VWM, and 0.35 °C/W RθJM - making it the only option validated for under-hood automotive load dump protection with minimal PCB thermal design overhead.
Availability
SM8A27HM3/I is available at Aetrix Electronics and suitable for automotive ECU power protection, body control module surge suppression, and ADAS camera input hardening requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for SM8A27HM3/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 TVS devices for automotive, industrial, and computing markets.
The SM8A27HM3/I belongs to Vishay's PAR® (Passivated Anisotropic Rectifier) TVS family, engineered specifically for automotive-grade transient suppression with emphasis on high-temperature stability, low leakage, and ISO 7637-2 compliance.
FAQ
What is the clamping voltage of the SM8A27HM3/I at 75 A?
The SM8A27HM3/I has a maximum clamping voltage (VC) of 40.0 V when subjected to a 10 μs/10 ms exponentially decaying waveform at IPP = 75 A. This value is measured per the device's datasheet (Document Number: 98646) and ensures downstream circuitry remains below safe overvoltage thresholds during standardized automotive surge events. The SM8A27HM3/I achieves this while maintaining low thermal resistance for repeatable performance.
Is the SM8A27HM3/I suitable for 24 V commercial vehicle applications?
The SM8A27HM3/I is specified for 22 V working voltage and 27 V breakdown, making it optimized for 12 V automotive systems. For 24 V nominal systems, its VWM provides insufficient margin - a higher-voltage variant such as SM8A33HM3/I (VWM = 28.2 V) is recommended. The SM8A27HM3/I should not be used in 24 V applications without verifying transient amplitude and duration against its 40.0 V clamping limit and thermal derating curves.
Does the SM8A27HM3/I require a heatsink on the PCB?
Yes - the SM8A27HM3/I's metal heatsink terminal (anode) must be soldered to a minimum 100 mm² copper pour or connected to a chassis ground plane to achieve its rated RθJM = 0.35 °C/W and sustain 8 W continuous power dissipation. Without adequate copper area, junction temperature will exceed 175 °C under sustained surge conditions. The SM8A27HM3/I datasheet specifies mounting pad layout dimensions for optimal thermal performance.
What does the "H" and "M3" suffix mean in SM8A27HM3/I?
In SM8A27HM3/I, "H" denotes AEC-Q101 qualification, confirming automotive-grade reliability testing; "M3" indicates halogen-free, RoHS-compliant, lead-free termination with JESD201 Class 2 whisker resistance. The "I" suffix specifies packaging in 13″ tape-and-reel (750 pcs), with anode orientation toward sprocket holes. These identifiers are defined in the Vishay ordering information table for the SM8A27HM3/I.
How does the SM8A27HM3/I compare to standard SMAJ-series TVS diodes?
The SM8A27HM3/I delivers 16.5× higher peak pulse power (6600 W vs. 400 W for SMAJ27A), uses DO-218AC packaging with integrated heatsink for superior thermal performance (RθJM = 0.35 °C/W vs. RθJA ≈ 50 °C/W), and is AEC-Q101 qualified - unlike SMAJ27A. The SM8A27HM3/I also exhibits lower leakage (<1 μA at 25 °C) and tighter VBR tolerance, making it suitable for mission-critical automotive applications where SMAJ-series parts are insufficient.
SM8A27HM3/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
- Voltage - Breakdown (Min):
- 24V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 75A
- 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
SM8A27HM3/I FAQ
1.How can I place an order for SM8A27HM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8A27HM3/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 SM8A27HM3/I reliable?
The price and inventory of SM8A27HM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8A27HM3/I is usually 5 days.
3.What payment methods are accepted for SM8A27HM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8A27HM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8A27HM3/I?
SM8A27HM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8A27HM3/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 SM8A27HM3/I?
For technical support, including SM8A27HM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8A27HM3/I requirements.
6.How does Aetrix verify that SM8A27HM3/I is sourced from the original manufacturer or authorized distributors?
All SM8A27HM3/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 SM8A27HM3/I meets industry standards.
7.What is the process for return or replacement of SM8A27HM3/I?
All SM8A27HM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8A27HM3/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 SM8A27HM3/I part is unused and in its original packaging.
Return procedure for SM8A27HM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8A27HM3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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