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Vishay General Semiconductor - Diodes Division SM8S24AHM3/I
- Part No.:
- SM8S24AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S24AHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,581
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Product details
Overview
SM8S24AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in high-reliability 24 V systems. It features a 24.0 V stand-off voltage (VWM), 28.1 V nominal breakdown voltage (VBR), 38.9 V maximum clamping voltage (VC) at 170 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Its DO-218AB package supports TJ = 175 °C operation and AEC-Q101 qualification.
For engineers reviewing the SM8S24AHM3/I datasheet, SM8S24AHM3/I pinout, SM8S24AHM3/I application, or SM8S24AHM3/I equivalent, this page delivers verified electrical parameters, thermal performance data, automotive compliance status, and real-world protection use cases - all specific to the SM8S24AHM3/I variant with HE3 RoHS-compliant, matte tin-plated leads and anode-heatsink polarity.
Technical Context
The SM8S24AHM3/I employs passivated anisotropic rectifier technology optimized for junction stability under high-temperature transients. Its unidirectional configuration enables robust clamping during positive-going surges, with low leakage (<10 μA at VWM) and low forward voltage drop (≤1.8 V at 100 A).
It meets ISO 7637-2 load dump requirements and achieves MSL Level 1 per J-STD-020 (245 °C reflow peak). Thermal resistance is characterized as RθJM = 0.35 °C/W (junction-to-mount) and RθJA = 55 °C/W (junction-to-ambient on FR4), enabling direct heatsink mounting via its metal anode tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold for 24 V automotive rails. |
| VBR (nom) | 28.1 V - Breakdown voltage at 5 mA test current; defines onset of avalanche conduction during surge events. |
| VC @ IPPM | 38.9 V - Clamped voltage at 170 A (10/1000 μs); ensures downstream ICs see <40 V during worst-case load dump. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling; sustains 170 A × 38.9 V surge without failure under standardized waveform. |
| TJ max | +175 °C - Maximum junction temperature rating; enables operation in engine bay environments without derating. |
| IFSM | 700 A - Non-repetitive forward surge current (8.3 ms half-sine); withstands high-current battery connection transients. |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation in PCB layout to protect against positive surges only. |
Pinout & Package
Package: DO-218AB - molded surface-mount case with integral metal heatsink tab (anode), UL 94 V-0 rated compound, and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries clamped surge current to anode/heatsink during overvoltage event. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal and electrical path to PCB copper pour or external heatsink; must be routed to ground or chassis for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for under-hood deployment. |
| Junction passivation | Optimized anisotropic rectifier structure minimizes parameter drift over time and temperature, ensuring stable VBR across 175 °C life. |
| MSL Level 1 | Rated for peak reflow temperatures up to 245 °C without moisture-induced damage - eliminates pre-bake requirement in SMT assembly. |
| Low leakage at VWM | <10 μA at 24 V and 25 °C - prevents parasitic drain in always-on vehicle modules (e.g., body control units, telematics). |
| ISO 7637-2 compliance | Validated against Pulse 5a (load dump) test conditions - directly supports OEM-level EMC certification for 24 V commercial vehicles. |
Applications
| Automotive Load Dump Protection | DC-DC Converter Input Protection |
|---|---|
Use Scenario: Protecting 24 V power distribution networks in trucks and buses during alternator field decay after battery disconnect. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and main fuse box input, clamping transients within 1 ns. Use Value: Limits voltage to ≤38.9 V during 6600 W load dump events, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Safeguarding buck converter inputs in ADAS domain controllers exposed to battery rail surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and controller IC. Use Value: Absorbs 170 A surge current without degradation, maintaining DC-DC regulation integrity during engine cranking transients. |
| Industrial Motor Drive Power Supply | Commercial Vehicle Telematics Module |
Use Scenario: Shielding 24 V auxiliary power supplies in hydraulic pump controllers from inductive kickback. IC Role / Device Role / Timing Role: Fast-response transient suppressor mounted adjacent to motor driver H-bridge supply input. Use Value: Withstands repetitive 700 A IFSM surges and operates continuously at +125 °C ambient, supporting IP67-rated enclosures. |
Use Scenario: Securing GPS/GSM module power input in fleet management units subjected to cold-crank and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on main 24 V input line, preceding LDO regulators and communication ICs. Use Value: Delivers <10 μA leakage at 24 V to preserve battery life over multi-year deployments, while meeting AEC-Q101 vibration and thermal shock requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/A | Lower PPPM (400 W vs. 6600 W), DO-214AC package, 38.9 V VC at 10.3 A - not suitable for load dump. | Intended for board-level ESD (IEC 61000-4-2), not ISO 7637-2 load dump. | Select SMAJ24AHE3/A only for low-energy signal-line protection where peak current <15 A. |
| SM8S24AHE3/A | Same electrical specs and DO-218AB package, but lacks H-grade AEC-Q101 qualification (industry grade only). | Acceptable for non-automotive industrial use; not approved for OEM vehicle production. | Choose SM8S24AHE3/A for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
Compared with SMAJ24AHE3/A and SM8S24AHE3/A, the SM8S24AHM3/I uniquely combines 6600 W surge capability, AEC-Q101 qualification, and DO-218AB thermal performance - making it the only option among the three validated for automotive load dump compliance.
Availability
SM8S24AHM3/I is available at Aetrix Electronics and suitable for automotive load dump protection, 24 V DC-DC converter input safeguarding, and industrial motor drive power supply surge suppression requiring stable component supply across extended product lifecycles.
Supply support for SM8S24AHM3/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 SM8SxxA family was engineered specifically for high-energy automotive transients, emphasizing 175 °C operation, ISO 7637-2 compliance, and robust thermal mounting - targeting under-hood power rail protection.
FAQ
What is the clamping voltage of the SM8S24AHM3/I at its rated peak pulse current?
The SM8S24AHM3/I has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated 170 A peak pulse current under the 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number 88387, page 2) and ensures downstream 24 V system components remain within safe operating voltage limits during load dump events.
Is the SM8S24AHM3/I qualified for automotive applications?
Yes, the SM8S24AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering information table and device marking code ('H' suffix denotes AEC-Q101 qualification). It is explicitly intended for automotive load dump protection and meets ISO 7637-2 requirements, making it suitable for OEM production in trucks, buses, and off-highway vehicles.
What does the 'HM3' suffix mean in SM8S24AHM3/I?
The 'HM3' suffix in SM8S24AHM3/I decodes as follows: 'H' = AEC-Q101 qualified; 'M3' = packaging variant indicating 750-unit tape-and-reel delivery in 13-inch diameter reels with anode oriented toward sprocket holes. The 'I' denotes the preferred package code per Vishay's ordering matrix (page 3 of document 88387).
Can the SM8S24AHM3/I be used in bidirectional configurations?
No, the SM8S24AHM3/I is unidirectional only, with polarity defined as anode-connected-to-heatsink. It provides clamping only for positive-going transients on the cathode side. For bidirectional protection, two SM8S24AHM3/I devices must be used in series-opposing configuration - but this is not recommended due to increased footprint and thermal coupling limitations.
What is the thermal resistance from junction to mount (RθJM) for the SM8S24AHM3/I?
The SM8S24AHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.35 °C/W, as specified in the Thermal Characteristics table (page 3 of document 88387). This low value reflects efficient heat transfer from the silicon die through the metal heatsink tab to the PCB copper pour or external heatsink - critical for sustaining repeated surge events at elevated ambient temperatures.
SM8S24AHM3/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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 170A
- 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
SM8S24AHM3/I FAQ
1.How can I place an order for SM8S24AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S24AHM3/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 SM8S24AHM3/I reliable?
The price and inventory of SM8S24AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S24AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S24AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S24AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S24AHM3/I?
SM8S24AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S24AHM3/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 SM8S24AHM3/I?
For technical support, including SM8S24AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S24AHM3/I requirements.
6.How does Aetrix verify that SM8S24AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S24AHM3/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 SM8S24AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S24AHM3/I?
All SM8S24AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S24AHM3/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 SM8S24AHM3/I part is unused and in its original packaging.
Return procedure for SM8S24AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S24AHM3/I Tags
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