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Vishay General Semiconductor - Diodes Division SM5S24CAHM3/I
- Part No.:
- SM5S24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S24CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S24CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, rated for 24 V stand-off voltage (VWM), 28.1 V nominal breakdown voltage (VBR), and 3600 W peak pulse power (10/1000 µs). It delivers 92.5 A peak pulse current and clamps to 38.9 V at that current, with AEC-Q101 qualification and 175 °C junction temperature capability - designed specifically for automotive load dump protection.
For engineers reviewing the SM5S24CAHM3/I datasheet, SM5S24CAHM3/I pinout, SM5S24CAHM3/I application, or SM5S24CAHM3/I equivalent, this device serves as a high-reliability, high-surge-capability TVS for 12 V/24 V automotive electrical systems where ISO 7637-2 and ISO 16750-2 compliance is required under harsh thermal and transient conditions.
Technical Context
This TVS diode operates in bidirectional avalanche mode with no polarity marking, enabling symmetrical clamping of positive and negative transients. Its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.45 °C/W), supporting stable operation up to TJ = 175 °C without derating penalties typical of standard SMD packages.
The device meets JESD201 Class 2 whisker resistance and MSL Level 1 (245 °C peak reflow), with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Its 5 W steady-state power dissipation and 65 °C/W junction-to-ambient thermal resistance are specified on FR4 PCB with standard footprint per IPC-7351.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum continuous reverse operating voltage before clamping begins; defines system-level DC bus tolerance margin. |
| VBR (nom) | 28.1 V - Voltage at which device enters avalanche conduction at 5 mA test current; ensures predictable turn-on during transients. |
| VC @ IPPM | 38.9 V - Clamping voltage at 92.5 A peak pulse (10/1000 µs); determines maximum stress imposed on protected downstream circuitry. |
| PPPM (10/1000 µs) | 3600 W - Peak surge power handling capacity; enables robust protection against severe load dump events per ISO 7637-2 Pulse 5a. |
| TJ max | 175 °C - Maximum junction temperature rating; supports under-hood automotive placement without thermal derating loss. |
| Leakage @ VWM | 10 µA at 25 °C - Low reverse leakage preserves battery life and avoids false triggering in always-on vehicle modules. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: DO-218AC - Surface-mount, bidirectional TVS with integrated metal heatsink terminal (Lead 2), optimized for high-power transient dissipation and thermal management. Meets UL 94 V-0 flammability rating; halogen-free, RoHS-compliant, and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | No polarity marking; symmetric terminals enable mounting without orientation constraints in PCB layout. |
| Lead 2 / Metal Heatsink | Common terminal / Thermal path | Primary thermal interface to PCB copper pour; reduces RθJM to 0.45 °C/W for sustained surge energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or dual-polarity DC lines without external polarity logic or discrete diode pairs. |
| ISO 7637-2 & ISO 16750-2 compliance | Validated for automotive load dump (Pulse 5a), jump start, and supply interruption transients - eliminates need for additional system-level validation. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 245 °C peak without moisture-induced failure, reducing manufacturing risk and cost. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, ensuring long-term reliability in automotive under-hood environments. |
| Halogen-free, RoHS-compliant M3 termination | Meets global environmental regulations and OEM material declarations without compromising surge performance or thermal stability. |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Protection |
|---|---|
|
Use Scenario: Protecting engine control units (ECUs), body control modules (BCMs), and infotainment systems from alternator load dump transients exceeding 40 V. IC Role / Device Role / Timing Role: Primary clamping element placed directly across battery input rail, responding within nanoseconds to suppress voltage spikes above 38.9 V. Use Value: Prevents latch-up or permanent damage to downstream 3.3 V/5 V regulators and microcontrollers by limiting rail voltage to ≤38.9 V during 3600 W surges. |
Use Scenario: Safeguarding CAN/LIN transceivers, sensors, and actuators connected to shared 12 V or 24 V vehicle power distribution networks. IC Role / Device Role / Timing Role: Standoff protector maintaining <10 µA leakage at 24 V while clamping fast-rising transients (e.g., inductive switch-off) to safe levels. Use Value: Ensures uninterrupted communication and sensor accuracy by preventing transient-induced resets or data corruption in real-time automotive networks. |
| Industrial Motor Drive Input Stage | Commercial Vehicle Battery Management |
|
Use Scenario: Shielding motor drive controllers in off-highway equipment from back-EMF spikes generated during contactor switching or regenerative braking. IC Role / Device Role / Timing Role: High-energy transient absorber mounted at DC bus entry point, leveraging DO-218AC metal heatsink for rapid thermal dissipation. Use Value: Extends controller lifetime by absorbing >2200 W (10/10,000 µs) surges without degradation, eliminating need for bulky MOV-based solutions. |
Use Scenario: Securing BMS front-end analog monitoring circuits (voltage/current sensing, cell balancing) in heavy-duty truck and bus battery packs. IC Role / Device Role / Timing Role: Precision overvoltage clamp with ±5 % VBR tolerance (26.7–29.5 V), ensuring consistent trip threshold across temperature and lifetime. Use Value: Maintains measurement integrity and prevents false fault triggers by holding clamping voltage tightly at 38.9 V even after repeated 92.5 A pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/5A | Lower PPPM (400 W), SMA package (DO-214AC), higher RθJA (100 °C/W), not AEC-Q101 qualified. | Limited to non-automotive industrial or consumer use; insufficient for ISO 7637-2 Pulse 5a load dump. | Select only for cost-sensitive, low-surge applications where 175 °C operation and automotive qualification are unnecessary. |
| TPSMB24CA | Same DO-218AC package and 3600 W rating, but VBR min/max wider (24.2–28.9 V), no M3 halogen-free designation, not AEC-Q101 certified. | Acceptable for commercial automotive Tier 2 suppliers requiring mechanical compatibility but lacking full AEC-Q101 traceability. | Choose when footprint and surge rating match but full OEM qualification documentation is not mandatory. |
Compared with SMAJ24A-E3/5A and TPSMB24CA, the SM5S24CAHM3/I provides verified AEC-Q101 qualification, tighter VBR tolerance (±5 %), guaranteed M3 material compliance, and documented ISO 7637-2/16750-2 performance - making it the only option qualified for Tier 1 automotive front-end protection without design revalidation.
Availability
SM5S24CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, and commercial vehicle battery management systems requiring stable component supply, long-lifecycle support, and full AEC-Q101 traceability.
Supply support for SM5S24CAHM3/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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM5SxxCA family is engineered for automotive-grade transient suppression, combining high-temperature stability, AEC-Q101 qualification, and DO-218AC thermal performance to meet stringent OEM requirements for under-hood electronics protection.
FAQ
What is the clamping voltage of the SM5S24CAHM3/I at its rated peak pulse current?
The SM5S24CAHM3/I clamps to a maximum of 38.9 V at its rated peak pulse current of 92.5 A under the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number: 98458), and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SM5S24CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM5S24CAHM3/I suitable for automotive load dump protection per ISO 7637-2?
Yes, the SM5S24CAHM3/I is explicitly validated to meet ISO 7637-2 and ISO 16750-2 surge specifications for automotive load dump protection. Its 3600 W peak pulse power rating (10/1000 µs), 38.9 V clamping voltage, and AEC-Q101 qualification confirm suitability for Pulse 5a testing. The SM5S24CAHM3/I is deployed in production ECUs and BCMs where compliance with OEM-level transient immunity standards is mandatory.
Does the SM5S24CAHM3/I have polarity markings, and how is it mounted?
No, the SM5S24CAHM3/I is a bidirectional TVS diode with no cathode band or polarity marking - both terminals are functionally identical. It uses the DO-218AC package with two leads: Lead 1 (anode/cathode) and Lead 2 (metal heatsink terminal). Mounting requires no orientation check, simplifying automated placement and reducing assembly errors. The SM5S24CAHM3/I relies on symmetric avalanche conduction for equal clamping in both directions.
What is the thermal resistance profile of the SM5S24CAHM3/I, and why does it matter?
The SM5S24CAHM3/I has a junction-to-mount thermal resistance (RθJM) of 0.45 °C/W and junction-to-ambient (RθJA) of 65 °C/W on FR4 PCB with standard pad layout. The ultra-low RθJM enables efficient heat transfer from the silicon die to the PCB copper pour via the metal heatsink terminal, critical for sustaining repeated high-energy surges without thermal runaway. This makes the SM5S24CAHM3/I uniquely capable of automotive under-hood operation up to 175 °C.
How does the HM3 suffix in SM5S24CAHM3/I affect compliance and reliability?
"HM3" denotes halogen-free, RoHS-compliant, AEC-Q101-qualified construction with JESD201 Class 2 whisker-resistant matte tin plating. The "H" confirms AEC-Q101 qualification, "M3" specifies material compliance (halogen-free, Pb-free, RoHS), and the "/I" indicates tape-and-reel packaging (750 pcs per reel). These identifiers ensure the SM5S24CAHM3/I meets Tier 1 automotive material declarations and long-term reliability requirements without trade-offs in surge performance.
SM5S24CAHM3/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):
- 92.5A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S24CAHM3/I FAQ
1.How can I place an order for SM5S24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S24CAHM3/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 SM5S24CAHM3/I reliable?
The price and inventory of SM5S24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S24CAHM3/I?
SM5S24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S24CAHM3/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 SM5S24CAHM3/I?
For technical support, including SM5S24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S24CAHM3/I requirements.
6.How does Aetrix verify that SM5S24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S24CAHM3/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 SM5S24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S24CAHM3/I?
All SM5S24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S24CAHM3/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 SM5S24CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S24CAHM3/I Tags
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