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Vishay General Semiconductor - Diodes Division SM8A27HE3/2D
- Part No.:
- SM8A27HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8A27HE3/2D.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:452
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Product details
Overview
SM8A27HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) 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 stand-off voltage, and AEC-Q101 qualification for operation up to TJ = 175 °C in DO-218AB package.
For engineers reviewing the SM8A27HE3/2D datasheet, SM8A27HE3/2D pinout, SM8A27HE3/2D application, or SM8A27HE3/2D equivalent, key selection criteria include clamping voltage (≤40.0 V at 75 A), low leakage (<1.0 μA at 25 °C), high surge capability, ISO7637-2 compliance, and thermal resistance RθJM = 0.35 °C/W for heatsink-mounted designs.
Technical Context
The SM8A27HE3/2D employs passivated anisotropic rectifier technology with junction passivation optimized for high-reliability automotive environments. Its unidirectional polarity and heatsink-anode configuration enable efficient thermal dissipation via the metal base, supporting sustained operation at TJ = 175 °C under load dump transients.
It meets MSL Level 1 per J-STD-020 (peak reflow 245 °C), complies with ISO7637-2 for automotive surge immunity, and delivers clamping voltage ≤40.0 V at 75 A with low forward voltage drop (≤0.98 V at 6 A), enabling robust protection of downstream 24 V systems without excessive conduction loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 24–30 V at 10 mA - defines precise breakdown threshold for reliable triggering during overvoltage events |
| VWM | 22 V - maximum continuous reverse voltage before leakage exceeds 1.0 μA, suitable for 24 V nominal systems |
| PPPM (10/1000 μs) | 6600 W - enables suppression of high-energy load dump surges without failure |
| IPPM | 130 A - peak transient current handling capacity under standardized surge waveform |
| RθJM | 0.35 °C/W - thermal resistance from junction to metal heatsink, critical for thermal design with direct mounting |
| TJ max. | 175 °C - extended junction temperature rating ensures reliability in under-hood automotive environments |
| VC @ 75 A | ≤40.0 V - clamping voltage limits protected circuit stress during surge events |
Pinout & Package
Package: DO-218AB - molded surface-mount package with metal heatsink base (anode), matte tin-plated leads, UL 94 V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink Base) | Positive terminal / thermal path | Primary heat dissipation interface; must be soldered to PCB copper pour or heatsink for RθJM = 0.35 °C/W performance |
| Cathode (Lead 1) | Negative terminal / surge current return | Connected to protected line (e.g., battery rail); carries full IPPM during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JEDEC standards |
| ISO7637-2 compliance | Guarantees protection against standardized automotive load dump and switching transients (Pulse 5a/b) |
| Low leakage at high temperature | ≤50.0 μA at TJ = 175 °C - prevents parasitic drain in always-on vehicle modules |
| Passivated anisotropic rectifier | Enhanced stability and reduced parameter drift over lifetime under thermal and electrical stress |
| MSL Level 1 rating | Enables standard SMT reflow without moisture-induced damage (peak 245 °C) |
Applications
| Automotive Load Dump Protection | 24 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) during alternator load dump events in 24 V commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient energy directly at the power input stage. Use Value: Limits voltage to ≤40.0 V during 6600 W surges, preventing latch-up or damage to downstream DC/DC converters and microcontrollers. | Use Scenario: Safeguarding infotainment head units and telematics gateways connected to vehicle battery rails subject to inductive switching noise. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed upstream of LDOs and PMICs to absorb sub-millisecond spikes. Use Value: Low VF (≤0.98 V) minimizes conduction loss during normal operation while maintaining <1.0 μA leakage at 25 °C for low standby power. |
| Under-Hood Sensor Interface Protection | Commercial Vehicle CAN Bus Power Line Guard |
Use Scenario: Shielding temperature, pressure, and position sensors mounted near engines or exhaust systems where ambient TA exceeds 125 °C. IC Role / Device Role / Timing Role: Primary overvoltage clamp on sensor supply lines, leveraging 175 °C TJ rating and stable VBR drift (≤36 mV/°C). Use Value: Maintains protection integrity across full automotive temperature range without derating, unlike lower-TJ alternatives. | Use Scenario: Protecting CAN transceivers and bus power conditioning circuits in heavy-duty truck ECUs exposed to long cable runs and high-inductance loads. IC Role / Device Role / Timing Role: High-energy TVS on VCC rail feeding isolated CAN power supplies, coordinated with common-mode chokes. Use Value: 5200 W rating (10/10,000 μs) handles sustained load dump energy better than standard 600 W TVS arrays, reducing failure risk in harsh duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8A27HM3 | Same electrical specs and DO-218AB package; HM3 suffix indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified variant with identical thermal and surge ratings | No functional difference; intended as direct replacement for new designs where E3 (non-halogen-free) is not required | Select SM8A27HM3 for new designs requiring halogen-free compliance; SM8A27HE3/2D remains valid for legacy builds with E3 material specification |
| SMAJ27A | Lower PPPM (400 W vs. 6600 W), SMA package (RθJA ≈ 55 °C/W), no AEC-Q101 qualification, VBR = 28.9–31.9 V | Not suitable for automotive load dump; limited to low-energy board-level ESD/surge protection in industrial controls | Use only in non-automotive, low-surge applications where space constraints preclude DO-218AB; cannot replace SM8A27HE3/2D in AEC-Q101 or ISO7637-2 contexts |
Compared with SM8A27HM3, the SM8A27HE3/2D offers identical surge performance but differs in material composition (E3 = non-halogen-free), making it suitable for specific legacy automotive programs. Versus SMAJ27A, SM8A27HE3/2D provides 16.5× higher peak power, certified automotive qualification, and integrated heatsink-enabling protection where thermal and energy demands exceed standard SMA devices.
Availability
SM8A27HE3/2D is available at Aetrix Electronics and suitable for automotive electronic control units, 24 V commercial vehicle power systems, and under-hood sensor interfaces requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101 qualified parts.
Supply support for SM8A27HE3/2D 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 TVS devices with emphasis on high-reliability, high-power, and automotive-qualified solutions.
The SM8A27HE3/2D belongs to Vishay's PAR® (Planar Anisotropic Rectifier) TVS family, engineered specifically for high-energy automotive load dump protection with superior thermal performance and long-term stability under extreme temperature and surge stress.
FAQ
What is the primary function of the SM8A27HE3/2D in automotive systems?
The SM8A27HE3/2D functions as a unidirectional transient voltage suppressor optimized for automotive load dump protection. It clamps high-energy voltage spikes-such as those generated during alternator disconnection-to ≤40.0 V at 75 A, safeguarding sensitive 24 V electronics like ECUs and BCMs. Its DO-218AB package with metal heatsink anode enables direct thermal coupling, and its AEC-Q101 qualification confirms suitability for under-hood deployment. The SM8A27HE3/2D is explicitly rated for ISO7637-2 Pulse 5 compliance.
Is the SM8A27HE3/2D pin-compatible with other DO-218AB TVS diodes?
The SM8A27HE3/2D uses the standard DO-218AB outline with anode on the metal heatsink base and cathode on lead 1, matching mechanical and thermal footprint requirements of other DO-218AB devices. However, pin compatibility alone does not guarantee functional equivalence-electrical parameters such as VBR, PPPM, and clamping voltage must be verified per application. The SM8A27HE3/2D is not a drop-in replacement for non-AEC-Q101 or non-ISO7637-2 rated DO-218AB parts due to its specific automotive qualification and surge performance profile.
What does the "HE3/2D" suffix indicate in SM8A27HE3/2D?
The "HE3/2D" suffix encodes manufacturing and packaging details: "H" denotes AEC-Q101 qualification; "E3" specifies RoHS-compliant, non-halogen-free material with matte tin plating and JESD201 Class 2 whisker resistance; "2D" identifies the preferred packaging code for 13-inch plastic tape-and-reel delivery with 750 units per reel and anode orientation toward sprocket holes. This full suffix ensures traceability to Vishay's documented ordering matrix and environmental compliance requirements.
Can the SM8A27HE3/2D be used in 12 V automotive systems?
The SM8A27HE3/2D is specified for 24 V nominal systems, with VWM = 22 V and VBR = 24–30 V-making it unsuitable for direct use in 12 V systems where typical operating voltages reach only ~14 V. Using it in 12 V applications risks premature conduction and excessive leakage, especially at elevated temperatures. For 12 V load dump protection, Vishay recommends lower-voltage variants such as SM8A15HE3/2D (VWM = 12.8 V). The SM8A27HE3/2D must be applied only where system nominal voltage and transient thresholds align with its 22–30 V operating window.
How does the thermal performance of SM8A27HE3/2D compare to standard SMA-package TVS diodes?
The SM8A27HE3/2D achieves RθJM = 0.35 °C/W by direct mounting its metal heatsink anode to PCB copper or external heatsinks-over 150× better than typical SMA-package TVS diodes (RθJA ≈ 55 °C/W). This enables sustained power dissipation (PD = 8 W) and safe operation at TJ = 175 °C, whereas SMA devices thermally saturate well below 1 W in most layouts. The SM8A27HE3/2D's thermal architecture is essential for automotive load dump, where energy must be absorbed without junction overheating. Its performance cannot be replicated using standard surface-mount packages.
SM8A27HE3/2D 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 75A (8/20µs)
- 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
SM8A27HE3/2D FAQ
1.How can I place an order for SM8A27HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8A27HE3/2D 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 SM8A27HE3/2D reliable?
The price and inventory of SM8A27HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8A27HE3/2D is usually 5 days.
3.What payment methods are accepted for SM8A27HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8A27HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8A27HE3/2D?
SM8A27HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8A27HE3/2D 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 SM8A27HE3/2D?
For technical support, including SM8A27HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8A27HE3/2D requirements.
6.How does Aetrix verify that SM8A27HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8A27HE3/2D 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 SM8A27HE3/2D meets industry standards.
7.What is the process for return or replacement of SM8A27HE3/2D?
All SM8A27HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8A27HE3/2D, 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 SM8A27HE3/2D part is unused and in its original packaging.
Return procedure for SM8A27HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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