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Vishay General Semiconductor - Diodes Division SM8S24CAHM3/I
- Part No.:
- SM8S24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S24CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,025
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Product details
Overview
SM8S24CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 24 V stand-off voltage (VWM), 28.1 V nominal breakdown voltage (VBR), 38.9 V maximum clamping voltage at 170 A peak pulse current, and 6600 W peak pulse power rating with 10/1000 μs waveform - all rated for operation up to TJ = 175 °C.
For engineers reviewing the SM8S24CAHM3/I datasheet, SM8S24CAHM3/I pinout, SM8S24CAHM3/I application, or SM8S24CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where ISO 7637-2 and ISO 16750-2 surge compliance, low leakage (<10 μA at VWM), and AEC-Q101 qualification are mandatory.
Technical Context
This TVS diode operates as a voltage-clamping overvoltage protection device in parallel with sensitive electronics. Its bidirectional architecture enables symmetric suppression of both positive and negative transients without polarity sensitivity, and its DO-218AC package provides low thermal resistance (RθJM = 0.35 °C/W) for efficient heat transfer to the PCB metal heatsink.
The device delivers 170 A peak pulse current under 10/1000 μs surge conditions while maintaining clamping below 38.9 V - critical for safeguarding downstream 3.3 V, 5 V, and 12 V logic and power ICs in engine control units, body controllers, and ADAS modules against load dump and inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum reverse stand-off voltage before conduction; defines safe operating window for 24 V automotive systems. |
| VBR (nom) | 28.1 V - Nominal breakdown voltage at 5 mA test current; ensures reliable triggering above normal rail variation. |
| VC @ IPPM | 38.9 V - Clamping voltage at 170 A peak pulse; limits voltage seen by protected ICs during ISO 7637-2 Pulse 5a. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling; supports high-energy load dump surges without failure. |
| TJ max | 175 °C - Maximum junction temperature; enables under-hood deployment in modern automotive ECUs. |
| ID @ VWM | <10 μA - Reverse leakage at 24 V; minimizes standby power loss in always-on vehicle networks. |
| Package | DO-218AC - Surface-mount package with integrated metal heatsink terminal; optimized for thermal dissipation on FR4 PCB. |
Pinout & Package
DO-218AC package features two terminals: Terminal 1 (anode-side lead) and Terminal 2 (metal heatsink/cathode-side pad). The device is bidirectional with no cathode band marking; polarity is irrelevant for transient suppression function. Thermal performance relies on soldering Terminal 2 to a large copper pour acting as a heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode-side lead | Soldered to protected line (e.g., battery rail); forms one side of parallel-connected TVS path. |
| Terminal 2 | Metal heatsink pad | Primary thermal path to PCB copper; must be connected to ≥250 mm² copper area for RθJA ≤ 55 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD47. |
| ISO 7637-2 & ISO 16750-2 compliant | Meets Pulse 1, 2a, 2b, 3a/b, and 5a requirements for 12 V/24 V vehicle electrical systems. |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Halogen-free, RoHS-compliant (M3) | Meets environmental regulations and whisker resistance Class 2 per JESD201. |
| Bidirectional symmetry | No polarity marking required; simplifies layout and eliminates orientation errors in production. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: Protects microcontroller power supply and I/O lines from alternator load dump surges during battery disconnection. IC Role / Device Role: Parallel-connected clamping TVS placed directly at ECU main power entry point. Use Value: Limits transient voltage to ≤38.9 V, preventing latch-up or damage to 5 V/3.3 V regulators and MCU VDD pins. |
Use Scenario: Shields high-speed CAN transceivers from coupled transients on shared 12 V supply rails. IC Role / Device Role: Secondary protection stage after primary LC filter, clamping supply rail overshoot. Use Value: Maintains <10 μA leakage at 12 V, avoiding CAN bus bias current disruption and signal integrity loss. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Guards image sensor and serializer ICs against ignition noise and relay switching spikes in front-end camera harnesses. IC Role / Device Role: Localized TVS on 24 V input and 3.3 V domain rails within compact camera housing. Use Value: 175 °C rating allows placement near heat-generating image processors without derating. |
Use Scenario: Suppresses inductive kickback from H-bridge motor windings during PWM commutation. IC Role / Device Role: Bidirectional clamp across motor driver high-side and low-side supply rails. Use Value: 6600 W peak power rating absorbs repetitive 10/1000 μs surges without degradation over 10-year EPS lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | DO-214AC package; 400 W PPPM (10/1000 μs); 43.5 V VC @ 51.7 A; not AEC-Q101 qualified. | Rated for industrial/commercial use only; lacks automotive surge compliance and high-temp validation. | Select when cost-sensitive non-automotive designs require basic 24 V clamping with lower energy demands. |
| ON Semiconductor SMCJ24CA | DO-214AB package; 1500 W PPPM (10/1000 μs); 38.9 V VC @ 38.9 A; AEC-Q101 qualified. | Lower surge capacity limits use to lower-energy transients; smaller footprint but higher RθJA (60 °C/W). | Select when board space is constrained and peak surge energy remains below 1500 W, e.g., interior lighting modules. |
Compared with SMAJ24A and SMCJ24CA, SM8S24CAHM3/I delivers 4.4× higher peak pulse power (6600 W vs. 1500 W/400 W), superior thermal performance (RθJM = 0.35 °C/W), and full automotive qualification - making it the only choice for under-hood 24 V load dump protection requiring sustained 175 °C operation.
Availability
SM8S24CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, ADAS camera integration, and electric power steering system development requiring stable component supply and long-term lifecycle support.
Supply support for SM8S24CAHM3/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 SM8SxxCA family is engineered specifically for automotive-grade transient suppression, combining AEC-Q101 qualification, ISO 7637-2 compliance, and high-temperature stability to meet stringent under-hood power rail protection requirements.
FAQ
What is the clamping voltage of SM8S24CAHM3/I at its rated peak pulse current?
The SM8S24CAHM3/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 Figure 4 in the official Vishay datasheet (Doc. #98229) and ensures downstream 24 V system ICs remain within safe operating voltage limits during load dump events.
Is SM8S24CAHM3/I suitable for 12 V automotive systems?
Yes, SM8S24CAHM3/I is commonly deployed in 24 V systems but is also appropriate for robust 12 V applications where higher surge margin is needed. Its 24 V stand-off voltage (VWM) and 28.1 V breakdown provide sufficient headroom above 12 V nominal rails while maintaining fast response to transients exceeding 30 V - verified in ISO 16750-2 testing.
Does SM8S24CAHM3/I require a specific PCB layout for thermal performance?
Yes, optimal thermal performance of SM8S24CAHM3/I requires soldering Terminal 2 (metal heatsink pad) to a minimum 250 mm² copper area on the PCB. Per JEDEC 51-14, this achieves RθJM = 0.35 °C/W; insufficient copper results in excessive junction temperature rise and premature failure during repeated surge events.
What does the "HM3" suffix indicate in SM8S24CAHM3/I?
The "HM3" suffix in SM8S24CAHM3/I denotes AEC-Q101 qualification ("H"), halogen-free/RoHS-compliant construction with matte tin plating ("M3"), and JESD201 Class 2 whisker resistance. The "/I" indicates tape-and-reel packaging with 750 units per reel and anode-first orientation per Vishay's ordering convention.
How does SM8S24CAHM3/I compare to standard SMA or SMB TVS diodes in surge capability?
SM8S24CAHM3/I delivers 6600 W peak pulse power - over 4× higher than typical SMAJ/SMBJ devices (1500 W max). This is enabled by the DO-218AC package's integrated metal heatsink and low RθJM (0.35 °C/W), allowing it to absorb automotive load dump energy that would destroy smaller-outline TVS diodes without derating or parallel staging.
SM8S24CAHM3/I 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:
- -
- Bidirectional Channels:
- 1
- 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-218AB
SM8S24CAHM3/I FAQ
1.How can I place an order for SM8S24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S24CAHM3/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 SM8S24CAHM3/I reliable?
The price and inventory of SM8S24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S24CAHM3/I?
SM8S24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S24CAHM3/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 SM8S24CAHM3/I?
For technical support, including SM8S24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S24CAHM3/I requirements.
6.How does Aetrix verify that SM8S24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S24CAHM3/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 SM8S24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S24CAHM3/I?
All SM8S24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S24CAHM3/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 SM8S24CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S24CAHM3/I Tags
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