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Vishay General Semiconductor - Diodes Division SM8S12AHE3/2D
- Part No.:
- SM8S12AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S12AHE3/2D.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,850
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Product details
Overview
SM8S12AHE3/2D 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 (VC) at 332 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Its DO-218AB package supports high-reliability automotive applications operating up to TJ = 175 °C.
For engineers reviewing the SM8S12AHE3/2D datasheet, SM8S12AHE3/2D pinout, SM8S12AHE3/2D application, or SM8S12AHE3/2D equivalent, key selection criteria include unidirectional polarity, ISO7637-2 compliance, AEC-Q101 qualification, low leakage (<10 μA at VWM), and thermal resistance of 0.90 °C/W (junction-to-case).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability under high-temperature stress. Its unidirectional configuration provides forward conduction path with 1.8 V max forward voltage at 100 A, enabling robust clamping during load dump transients without reverse conduction.
The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive use. Its DO-218AB case features a metal heatsink terminal (anode) and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 13.3 V / 14.7 V - ensures reliable triggering above system nominal voltage while avoiding false trips |
| 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 surge |
| PPPM (10/1000 μs) | 6600 W - handles severe load dump energy without failure in engine control modules |
| IFSM | 700 A - withstands repetitive 8.3 ms half-sine surges common in alternator switching events |
| TJ max. | 175 °C - enables operation in under-hood environments with minimal derating |
| RθJC | 0.90 °C/W - allows efficient heat transfer to PCB copper or external heatsink for sustained power dissipation |
Pinout & Package
Package: DO-218AB - surface-mount, anode-heatsink configuration with metal base acting as primary thermal and electrical terminal. Leads are matte tin-plated; anode is connected to the metal heatsink (Lead 2), cathode to Lead 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into device during clamping |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and return path to ground/power rail; must be soldered to large copper area for RθJC performance |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable VBR and low leakage (<10 μA) over lifetime at 175 °C junction temperature |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and body electronics per stress test requirements |
| ISO7637-2 compliance | Guarantees survivability against standardized automotive load dump pulses (Pulse 5a) |
| MSL Level 1 rating | Permits unlimited floor life and reflow at 245 °C peak without moisture-induced damage |
| Low forward voltage | ≤1.8 V at 100 A enables efficient forward conduction during asymmetrical transients |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller power rails and CAN transceivers from alternator load dump spikes during battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-biased transients on 12 V supply line, limiting voltage to ≤19.9 V during 332 A surge. Use Value: Prevents latch-up or permanent damage to 24 V-rated regulators and interface ICs exposed to ISO7637-2 Pulse 5a. | Use Scenario: Shields LIN bus transceivers and door module drivers from inductive kickback generated by window motor and lock actuator switching. IC Role / Device Role / Timing Role: Fast-response clamping element placed at power entry point to absorb 6600 W transient energy within microseconds. Use Value: Maintains signal integrity and prevents reset events in distributed body electronics operating at ambient up to 105 °C. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Start-Stop System Battery Interface |
Use Scenario: Safeguards image sensor and ISP power supplies in front-facing cameras mounted near engine compartment. IC Role / Device Role / Timing Role: Primary overvoltage protection device on 12 V input rail, leveraging 0.90 °C/W RθJC for thermal stability under repeated surges. Use Value: Ensures uninterrupted video capture during cold-cranking and load dump events critical for collision avoidance functionality. | Use Scenario: Protects bidirectional DC-DC converter control circuitry from voltage reversals and surges during frequent engine restart cycles. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to battery ground, absorbing energy from regenerative braking and alternator transients. Use Value: Extends service life of MOSFET gate drivers and current sense amplifiers subjected to >100,000 start-stop cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ12A | DO-214AC package; 0.35 °C/W higher RθJA; same VWM/VC but 400 W lower PPPM (6200 W) | Less effective thermal coupling to PCB; requires larger copper area for equivalent power handling | Select when DO-214AC footprint is fixed and 6200 W surge capacity suffices |
| ON Semiconductor 1.5SMC12A | DO-214AB package; 1.25 °C/W RθJC; 1000 W lower PPPM (5600 W); non-AEC-Q101 | Not qualified for automotive under-hood use; limited to cabin or industrial applications | Select only for cost-sensitive non-automotive designs where AEC-Q101 is not required |
Compared with SMAJ12A and 1.5SMC12A, SM8S12AHE3/2D delivers superior thermal performance (0.90 °C/W), higher surge rating (6600 W), and full AEC-Q101 qualification-making it the preferred choice for demanding automotive load dump protection where reliability and power density are critical.
Availability
SM8S12AHE3/2D is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, and start-stop system battery interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM8S12AHE3/2D 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, and protection devices with emphasis on automotive-grade reliability and high-temperature performance.
The SM8SxxA series is engineered specifically for automotive load dump suppression, combining high-power transient absorption, AEC-Q101 qualification, and DO-218AB thermal efficiency to meet stringent ISO7637-2 requirements.
FAQ
What is the clamping voltage of SM8S12AHE3/2D at its rated peak pulse current?
The SM8S12AHE3/2D has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 332 A using a 10/1000 μs waveform. This value is measured at TC = 25 °C and ensures downstream 24 V-rated ICs remain within safe operating limits during automotive load dump events. The SM8S12AHE3/2D maintains this clamping performance across its full operating temperature range due to its passivated junction design.
Is SM8S12AHE3/2D qualified for automotive applications?
Yes, SM8S12AHE3/2D is AEC-Q101 qualified and rated for operation from -55 °C to +175 °C junction temperature. It meets ISO7637-2 load dump requirements and is packaged in DO-218AB with MSL Level 1 rating-making it suitable for under-hood automotive applications including engine control units and body control modules. The SM8S12AHE3/2D also complies with JESD201 Class 2 whisker testing and RoHS directives.
What is the thermal resistance of SM8S12AHE3/2D, and how does it affect PCB layout?
The SM8S12AHE3/2D has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W. This low value requires direct thermal connection of the metal heatsink (anode) to a large copper pour or external heatsink to dissipate up to 8 W continuously. PCB layout must allocate ≥200 mm² of 2-oz copper connected to Lead 2; insufficient copper area will cause excessive junction temperature rise and premature failure during repeated surges. The SM8S12AHE3/2D datasheet provides recommended mounting pad dimensions for optimal thermal performance.
Does SM8S12AHE3/2D support bidirectional transient suppression?
No, SM8S12AHE3/2D is a unidirectional TVS diode with anode-connected metal heatsink and cathode on Lead 1. It conducts only in forward bias during positive transients and blocks reverse voltage up to VWM = 12.0 V. For bidirectional protection, a separate device such as SM8S12AY or paired unidirectional units would be required. The SM8S12AHE3/2D polarity is fixed and marked on the package with a cathode band adjacent to Lead 1.
What packaging format is used for SM8S12AHE3/2D, and what does the "/2D" suffix indicate?
SM8S12AHE3/2D is supplied in 13" diameter plastic tape and reel, with 750 units per reel. The "/2D" suffix denotes the preferred package code indicating anode orientation toward the sprocket hole-a critical detail for automated placement verification. The "HE3" prefix confirms RoHS compliance, AEC-Q101 qualification, and JESD201 Class 2 whisker resistance. This packaging ensures consistent orientation and process compatibility for high-volume SMT assembly of the SM8S12AHE3/2D.
SM8S12AHE3/2D 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
SM8S12AHE3/2D FAQ
1.How can I place an order for SM8S12AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S12AHE3/2D 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 SM8S12AHE3/2D reliable?
The price and inventory of SM8S12AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S12AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S12AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S12AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S12AHE3/2D?
SM8S12AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S12AHE3/2D 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 SM8S12AHE3/2D?
For technical support, including SM8S12AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S12AHE3/2D requirements.
6.How does Aetrix verify that SM8S12AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S12AHE3/2D 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 SM8S12AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S12AHE3/2D?
All SM8S12AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S12AHE3/2D, 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 SM8S12AHE3/2D part is unused and in its original packaging.
Return procedure for SM8S12AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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