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Vishay General Semiconductor - Diodes Division SM8S12A-001HE3/2D
- Part No.:
- SM8S12A-001HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S12A-001HE3/2D.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,345
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Product details
Overview
SM8S12A-001HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 13.3 V minimum breakdown voltage (VBR), 12.0 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 332 A peak pulse current, 6600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S12A-001HE3/2D datasheet, SM8S12A-001HE3/2D pinout, SM8S12A-001HE3/2D application, or SM8S12A-001HE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 0.90 °C/W), 175 °C junction rating, low leakage (<10 µA at VWM), and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode operates as a unidirectional clamping device with anode-connected heatsink configuration. Its junction passivation optimized design delivers stable clamping behavior up to TJ = 175 °C and supports high-reliability automotive environments where thermal cycling and surge robustness are critical.
The device meets MSL Level 1 per J-STD-020 (245 °C reflow peak), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing. Its DO-218AB package enables direct thermal coupling to PCB copper for effective power dissipation during 10/1000 µs surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 13.3 V / 14.7 V - ensures reliable turn-on above system nominal voltage while avoiding false triggering |
| VWM | 12.0 V - maximum continuous reverse operating voltage compatible with 12 V automotive systems |
| VC @ IPPM | 19.9 V - clamps transients to safe levels for downstream 24 V-rated components during 332 A surges |
| PPPM (10/1000 µs) | 6600 W - handles severe load dump events without degradation under controlled thermal conditions |
| IFSM | 700 A - withstands repetitive 8.3 ms half-sine surges common in alternator switching scenarios |
| TJ max. | 175 °C - supports operation in high-temperature engine bay locations without derating loss |
| RθJC | 0.90 °C/W - enables efficient heat transfer from junction to heatsink, critical for sustained surge duty cycles |
Pinout & Package
Package: DO-218AB - thermally enhanced surface-mount case with metal heatsink terminal (Lead 2) and anode-connected lead (Lead 1). Molding compound meets UL 94 V-0; RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to protected line; must be routed with low-inductance path to minimize clamping overshoot |
| Lead 2 / Metal Heatsink | Cathode / Thermal Path | Functions as cathode and primary thermal interface; requires direct connection to large copper pour for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Ensures stable VBR and low leakage over lifetime, even under high-temperature bias stress |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and chassis applications per stress test requirements |
| Meets ISO7637-2 surge specification | Guarantees survivability against standardized automotive load dump waveforms (Pulse 5a/b) |
| MSL Level 1 rating | Permits single-reflow assembly without moisture sensitivity concerns or baking requirements |
| Low forward voltage drop | VF ≤ 1.8 V at 100 A enables minimal conduction loss during forward-biased fault conditions |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Protecting 12 V power inputs of vehicle modules during alternator field-circuit interruption events. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed at main power entry point before DC/DC converters. Use Value: Limits transient voltage to ≤19.9 V at 332 A, preventing damage to downstream regulators rated for 24 V absolute maximum. | Use Scenario: Safeguarding microcontroller supply rails and sensor interfaces in engine management systems exposed to battery transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on ECU 12 V input rail, coordinated with secondary LC filtering. Use Value: Maintains <10 µA leakage at 12 V VWM, ensuring no impact on low-power sleep-mode current budgets. |
| Body Control Module (BCM) Power Input | ADAS Camera Power Line Protection |
Use Scenario: Securing power inputs of BCMs handling lighting, door locks, and HVAC control in modern vehicles. IC Role / Device Role / Timing Role: High-energy transient suppressor mounted directly at connector entry with thermal pad to inner ground plane. Use Value: Delivers 6600 W surge capability with RθJC = 0.90 °C/W, enabling compact layout without external heatsinks. | Use Scenario: Protecting 12 V supply lines of forward-facing cameras subject to ignition noise and load dump in ADAS systems. IC Role / Device Role / Timing Role: Fast-response clamping element placed adjacent to camera module's DC/DC input stage. Use Value: Achieves 19.9 V clamping at full 332 A surge, preserving image sensor functionality during ISO7637-2 Pulse 5a events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/5BT | Lower PPPM (400 W), SMA package, RθJC ≈ 45 °C/W, VC = 19.9 V at 21.2 A | Not suitable for load dump; limited to low-energy ESD/surge events in non-automotive contexts | Select only for cost-sensitive consumer electronics with <500 W surge requirements |
| TPSMD12A | Same DO-218AB package, PPPM = 6600 W, but VBR min = 12.6 V, VC = 19.2 V at 347 A | Compatible for load dump, but lacks AEC-Q101 qualification and ISO7637-2 validation | Acceptable for industrial 12 V systems where automotive qualification is not mandated |
Compared with SMAJ12A-E3/5BT and TPSMD12A, the SM8S12A-001HE3/2D uniquely combines AEC-Q101 qualification, ISO7637-2 compliance, and 6600 W surge rating in the DO-218AB package-making it the only option validated for under-hood automotive load dump protection.
Availability
SM8S12A-001HE3/2D is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) input safeguarding, and body control module (BCM) power line hardening requiring stable component supply across production lifecycles.
Supply support for SM8S12A-001HE3/2D 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, TVS devices, and MOSFETs for high-reliability applications.
The SM8SxxA series is engineered specifically for automotive-grade transient suppression, targeting load dump and inductive switching protection in 12 V and 24 V vehicle electrical systems with extended temperature and surge endurance requirements.
FAQ
What is the clamping voltage of SM8S12A-001HE3/2D at its rated peak pulse current?
The SM8S12A-001HE3/2D has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 332 A using a 10/1000 µs waveform. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The SM8S12A-001HE3/2D maintains this clamping performance across its full operating temperature range due to its junction passivation design.
Is SM8S12A-001HE3/2D qualified for automotive applications?
Yes, the SM8S12A-001HE3/2D is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO7637-2 surge requirements for load dump protection and is rated for continuous operation from –55 °C to +175 °C junction temperature. Its DO-218AB package, matte tin plating, and JESD 201 Class 2 whisker resistance further validate its suitability for under-hood deployment. The SM8S12A-001HE3/2D carries the HE3 suffix confirming RoHS compliance and AEC-Q101 qualification.
What is the thermal resistance from junction to case for SM8S12A-001HE3/2D?
The SM8S12A-001HE3/2D has a typical thermal resistance from junction to case (RθJC) of 0.90 °C/W. This low value is enabled by its DO-218AB package architecture, where the metal heatsink terminal (Lead 2) provides a direct thermal path to the PCB copper. Effective thermal design requires mounting the SM8S12A-001HE3/2D on a minimum 100 mm² copper area to sustain its 6600 W peak pulse power rating. The SM8S12A-001HE3/2D datasheet includes derating curves for elevated case temperatures.
Does SM8S12A-001HE3/2D support bidirectional transient suppression?
No, the SM8S12A-001HE3/2D is a unidirectional TVS diode only. Its polarity is fixed with the anode on Lead 1 and cathode on the metal heatsink (Lead 2). It protects against positive transients on the anode side relative to the cathode. For bidirectional protection, two unidirectional devices must be used in series opposition or a dedicated bidirectional part such as SM8S12CA must be selected. The SM8S12A-001HE3/2D datasheet explicitly states "Available in uni-directional polarity only".
What packaging format does SM8S12A-001HE3/2D ship in?
The SM8S12A-001HE3/2D ships in 13" diameter plastic tape and reel format with a base quantity of 750 units per reel. The delivery mode specifies anode orientation toward the sprocket hole, which is critical for automated placement verification. The "2D" in the part number denotes the preferred package code per Vishay's ordering information, and the "HE3" suffix confirms RoHS compliance, AEC-Q101 qualification, and JESD 201 Class 2 whisker resistance. The SM8S12A-001HE3/2D unit weight is 2.605 g.
SM8S12A-001HE3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 332A
- 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
SM8S12A-001HE3/2D FAQ
1.How can I place an order for SM8S12A-001HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S12A-001HE3/2D 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 SM8S12A-001HE3/2D reliable?
The price and inventory of SM8S12A-001HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S12A-001HE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S12A-001HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S12A-001HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S12A-001HE3/2D?
SM8S12A-001HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S12A-001HE3/2D 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 SM8S12A-001HE3/2D?
For technical support, including SM8S12A-001HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S12A-001HE3/2D requirements.
6.How does Aetrix verify that SM8S12A-001HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S12A-001HE3/2D 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 SM8S12A-001HE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S12A-001HE3/2D?
All SM8S12A-001HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S12A-001HE3/2D, 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 SM8S12A-001HE3/2D part is unused and in its original packaging.
Return procedure for SM8S12A-001HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S12A-001HE3/2D Tags
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