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Vishay General Semiconductor - Diodes Division SM8S14AHM3/I
- Part No.:
- SM8S14AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S14AHM3/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,253
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Product details
Overview
SM8S14AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 14.0 V stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 5 mA, 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S14AHM3/I datasheet, SM8S14AHM3/I pinout, SM8S14AHM3/I application, or SM8S14AHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where TJ = 175 °C operation, low leakage (<10 μA at VWM), and ISO7637-2 compliance are required.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance across -55 °C to +175 °C. Its DO-218AB package integrates a metal heatsink (anode) and supports 700 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine).
The device exhibits 23.2 V maximum clamping voltage (VC) at rated IPPM, with a typical VBR temperature coefficient of 0.078 %/°C. Thermal resistance junction-to-mount is 0.35 °C/W, enabling effective heat transfer to PCB copper or external heatsinks in high-power transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14.0 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12 V automotive system protection. |
| VBR (min/typ/max) | 15.6 / 16.4 / 17.2 V at 5 mA - Confirmed breakdown range ensures reliable turn-on during load dump events without premature conduction. |
| VC (at IPPM) | 23.2 V - Clamped voltage during 6600 W surge; limits downstream IC stress to safe levels in ISO7637-2 test conditions. |
| PPPM (10/1000 μs) | 6600 W - Peak surge power handling capacity; enables single-device protection against severe automotive load dump transients. |
| ID (at VWM, 25 °C) | <10 μA - Ultra-low reverse leakage preserves battery life and avoids false triggering in always-on vehicle modules. |
| TJ max. | +175 °C - Enables placement near hot engine compartments without derating; validated per AEC-Q101 stress testing. |
| Package | DO-218AB - Thermally enhanced surface-mount package with integral metal heatsink (anode terminal) and MSL Level 1 rating. |
Pinout & Package
DO-218AB package features two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). The metal base serves as both thermal path and electrical anode connection, requiring direct mounting to large copper pour or heatsink for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (marked side) | Cathode | Connected to protected line (e.g., battery rail); carries transient current into anode during clamping. |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to ≥25 mm² copper area or external heatsink; primary thermal and electrical return path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per JESD47. |
| Junction passivation design | Stable VBR and low leakage maintained over lifetime and after exposure to high humidity or thermal stress. |
| ISO7637-2 compliance | Meets Pulse 5a/b load dump requirements for 12 V systems up to 35 V test amplitude and 10 ms exponential decay. |
| MSL Level 1 rating | Reflow-compatible up to 245 °C peak without moisture-induced failure; no baking required prior to assembly. |
| Low VF (1.8 V @ 100 A) | Minimizes forward conduction loss during bidirectional surge events; reduces self-heating during high-current clamping. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
|
Use Scenario: Protects ECU microcontroller and CAN transceivers from alternator load dump spikes during ignition-off events. IC Role / Device Role / Timing Role: Primary clamping device on main 12 V input; activates within nanoseconds to limit voltage to ≤23.2 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails by holding clamp voltage well below absolute maximum ratings. |
Use Scenario: Shields BCM power management ICs and LIN transceivers from repeated switching surges in door module circuits. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converters; absorbs repetitive 10/1000 μs transients. Use Value: Enables >100,000-cycle reliability in 12 V battery-connected modules due to low leakage and 175 °C junction capability. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
|
Use Scenario: Safeguards image sensor and ISP power inputs against cranking-induced transients and nearby relay switching noise. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor on 5 V or 3.3 V LDO input; clamps before downstream regulator overvoltage shutdown. Use Value: Maintains uninterrupted video stream during engine start-stop cycles by limiting transient duration and amplitude. |
Use Scenario: Protects gate drivers and current sense amplifiers in EPS H-bridge from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: High-energy TVS mounted directly at motor driver power input; handles 700 A IFSM surges without degradation. Use Value: Eliminates need for redundant TVS stacking while meeting ASIL-B functional safety requirements for steering integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14AHE3_A/H | Lower PPPM (400 W), DO-214AC package, RθJA = 65 °C/W, no AEC-Q101 qualification. | Suitable for non-automotive industrial controls; insufficient for ISO7637-2 load dump or under-hood thermal environments. | Select only for cost-sensitive consumer or commercial designs with <100 W surge requirements. |
| SM8S14AHE3_A/I | Same electrical specs and DO-218AB package, but industry-grade (no H suffix); not AEC-Q101 qualified. | Acceptable for non-safety-critical automotive accessories (e.g., infotainment USB ports) where qualification is not mandated. | Choose when AEC-Q101 is not required and supply chain availability favors non-H variants. |
Compared with SMAJ14AHE3_A/H and SM8S14AHE3_A/I, the SM8S14AHM3/I delivers certified automotive reliability, higher surge robustness (6600 W vs. 400 W), and guaranteed 175 °C operation-making it the sole option for ASIL-compliant power rail protection.
Availability
SM8S14AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, body control module hardening, and ADAS camera power conditioning requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SM8S14AHM3/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 passive components for automotive, industrial, and computing markets.
The SM8S series is engineered specifically for automotive load dump suppression, combining AEC-Q101 qualification, DO-218AB thermal efficiency, and 6600 W surge capability to meet stringent ISO7637-2 requirements.
FAQ
What is the clamping voltage of SM8S14AHM3/I at its rated peak pulse current?
The SM8S14AHM3/I has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number 88387, page 2) and ensures downstream circuitry remains within safe operating limits during load dump events.
Is SM8S14AHM3/I qualified for automotive applications?
Yes, SM8S14AHM3/I is AEC-Q101 qualified and explicitly intended for automotive use. Its qualification covers temperature cycling, high-temperature operating life, and mechanical shock testing. The "H" in the part number denotes AEC-Q101 compliance, and the device meets ISO7637-2 load dump requirements per the Vishay datasheet.
What does the "M3" suffix indicate in SM8S14AHM3/I?
The "M3" suffix in SM8S14AHM3/I specifies packaging: 750 units per 13-inch plastic tape-and-reel, with anode oriented toward the sprocket hole. This matches the preferred delivery mode defined in Vishay's ordering information table (Document Number 88387, page 3) and ensures consistent automated placement orientation.
Can SM8S14AHM3/I replace SM8S14AHE3_A/I in existing designs?
Yes, SM8S14AHM3/I is a direct replacement for SM8S14AHE3_A/I in terms of electrical specs, package (DO-218AB), and pinout. The "H" denotes AEC-Q101 qualification, and "M3" reflects identical tape-and-reel packaging-so no layout or firmware changes are needed when upgrading to the qualified version.
What is the maximum junction temperature rating for SM8S14AHM3/I?
The SM8S14AHM3/I is rated for a maximum junction temperature (TJ max.) of +175 °C, verified per AEC-Q101 stress testing. This allows reliable operation in under-hood environments such as engine bays or near powertrain ECUs where ambient temperatures exceed 125 °C.
SM8S14AHM3/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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 284A
- 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
SM8S14AHM3/I FAQ
1.How can I place an order for SM8S14AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S14AHM3/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 SM8S14AHM3/I reliable?
The price and inventory of SM8S14AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S14AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S14AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S14AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S14AHM3/I?
SM8S14AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S14AHM3/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 SM8S14AHM3/I?
For technical support, including SM8S14AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S14AHM3/I requirements.
6.How does Aetrix verify that SM8S14AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S14AHM3/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 SM8S14AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S14AHM3/I?
All SM8S14AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S14AHM3/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 SM8S14AHM3/I part is unused and in its original packaging.
Return procedure for SM8S14AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S14AHM3/I Tags
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