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Vishay General Semiconductor - Diodes Division SM5S24AHM3/I
- Part No.:
- SM5S24AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S24AHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,491
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Product details
Overview
SM5S24AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 24 V stand-off voltage (VWM), 28.1 V nominal breakdown voltage (VBR), 3600 W peak pulse power (10/1000 μs), 93 V clamping voltage at 150 A, and AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM5S24AHM3/I datasheet, SM5S24AHM3/I pinout, SM5S24AHM3/I application, or SM5S24AHM3/I equivalent, this device delivers high-reliability transient suppression in harsh thermal environments (TJ up to 175 °C), low leakage (<10 μA at VWM), and ISO7637-2 compliance - critical for 12 V/24 V automotive power rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for stable performance under high-temperature stress. Its unidirectional polarity and heatsink-as-anode configuration enable direct mounting to metal chassis for enhanced thermal dissipation.
Designed for load dump transients, it sustains 500 A non-repetitive forward surge current (IFSM) and maintains clamping integrity across -55 °C to +175 °C operating range. Thermal resistance junction-to-mount is 0.45 °C/W, enabling effective heat transfer to PCB copper or external heatsink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 24 V automotive systems. |
| VBR (nom) | 28.1 V - Breakdown voltage at 5 mA test current; ensures reliable triggering during transients exceeding normal rail voltage. |
| VC @ IPPM | 93 V - Clamping voltage at 150 A peak pulse current (10/1000 μs); limits downstream voltage stress during load dump events. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capability; supports high-energy ISO7637-2 Pulse 5a/b waveforms without failure. |
| TJ max | +175 °C - Maximum junction temperature rating; enables operation in engine bay or under-hood locations without derating. |
| ID @ VWM | <10 μA - Reverse leakage current at 24 V; minimizes standby power loss and avoids false triggering in low-power circuits. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink terminal (anode), matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive terminal / thermal interface | Electrically connected to metal base; must be soldered to large copper pour or chassis for optimal thermal performance and electrical return path. |
| Cathode (Lead 1) | Transient current sink | Connected to protected line (e.g., battery rail); conducts surge current to anode/heatsink during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivated anisotropic rectifier | Enables stable VBR drift ≤0.087 %/°C and low leakage at TJ = 175 °C - critical for long-term reliability in automotive under-hood use. |
| DO-218AB package with metal heatsink | RθJM = 0.45 °C/W allows direct thermal coupling to PCB copper or chassis, reducing junction temperature rise by >60 % vs. standard SMC packages. |
| ISO7637-2 Pulse 5 compliance | Validated for 12 V/24 V load dump waveforms (10 ms exponential decay); clamps to ≤93 V at 150 A, protecting downstream DC-DC converters and ECUs. |
| AEC-Q101 qualification | Covers HTGB, HTRB, TCT, UHAST, and ESD (HBM ≥8 kV) - confirms suitability for safety-critical automotive subsystems without additional qualification effort. |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) during alternator load dump events in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed between battery rail and input of DC-DC converter or LDO regulator. Use Value: Limits transient voltage to ≤93 V, preventing damage to 36 V-rated input stages and ensuring system reset-free operation after ISO7637-2 Pulse 5a (24 V system). |
Use Scenario: Safeguarding infotainment head units and ADAS camera modules against coupled transients from adjacent high-current loads (e.g., fuel pumps, fans). IC Role / Device Role / Timing Role: Standoff-clamp TVS on main 12 V supply line upstream of point-of-load regulators. Use Value: Delivers 3600 W surge capacity with <10 μA leakage at 24 V, minimizing standby current while maintaining fast response (<1 ns) to sub-microsecond spikes. |
| Industrial Vehicle Power Systems | Commercial HVAC Control Boards |
Use Scenario: Securing power inputs of telematics gateways and fleet management controllers in construction and agricultural machinery exposed to severe electrical noise. IC Role / Device Role / Timing Role: High-energy TVS on 24 V battery interface, mounted directly to chassis ground plane via heatsink terminal. Use Value: Sustains 175 °C junction temperature and 500 A IFSM, enabling uninterrupted operation in high-ambient-temperature cab environments without thermal shutdown. |
Use Scenario: Protecting microcontroller-based HVAC control boards in buses and coaches from ignition transients and relay switching noise. IC Role / Device Role / Timing Role: Unidirectional clamp on 24 V auxiliary power rail feeding MCU, CAN transceivers, and sensor interfaces. Use Value: Meets MSL Level 1 and JESD201 Class 2 whisker resistance, ensuring robustness through multiple reflow cycles and long-term field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/A | Lower PPPM (400 W), SMA package (RθJA ≈ 65 °C/W), no AEC-Q101 qualification, VBR min 26.7 V. | Not suitable for load dump; limited to low-energy ESD/surge in consumer or industrial non-automotive systems. | Select only for cost-sensitive, non-automotive designs where 3600 W surge capacity and 175 °C operation are unnecessary. |
| SMCJ24AHM3 | Same DO-218AB package and AEC-Q101 qualification, but higher VWM (24 V) and VC (93 V), identical PPPM (3600 W), same thermal specs. | Functionally interchangeable for load dump; differs only in part numbering convention and minor marking format. | Valid drop-in alternative with identical electrical, thermal, and mechanical behavior - verified via Vishay cross-reference documentation. |
Compared with SMAJ24AHE3/A, SM5S24AHM3/I provides 9× higher surge power and automotive qualification; versus SMCJ24AHM3, it offers identical protection performance with confirmed pinout and footprint compatibility - making it the preferred choice for new AEC-Q101-compliant 24 V designs.
Availability
SM5S24AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, 24 V industrial power systems, and commercial vehicle telematics requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SM5S24AHM3/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 TVS devices for automotive, industrial, and computing markets.
The SM5SxxA family is engineered specifically for automotive load dump protection, combining high-temperature stability, AEC-Q101 qualification, and DO-218AB thermal efficiency to meet stringent ISO7637-2 requirements.
FAQ
What is the clamping voltage of the SM5S24AHM3/I at its rated peak pulse current?
The SM5S24AHM3/I has a maximum clamping voltage (VC) of 93 V at 150 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and ensures downstream components see voltage limited to this level during high-energy transients such as automotive load dump events. The SM5S24AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM5S24AHM3/I qualified for automotive applications?
Yes, the SM5S24AHM3/I is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and unbiased highly accelerated stress test (UHAST). It is explicitly designed for automotive load dump protection and meets ISO7637-2 requirements for 12 V and 24 V systems.
What package does the SM5S24AHM3/I use, and how is thermal management achieved?
The SM5S24AHM3/I uses the DO-218AB surface-mount package with an integrated metal heatsink terminal serving as the anode. Thermal management relies on soldering this heatsink directly to a large PCB copper area or chassis ground, achieving a junction-to-mount thermal resistance (RθJM) of 0.45 °C/W - significantly lower than standard SMC packages and essential for sustained 175 °C operation.
Does the SM5S24AHM3/I meet moisture sensitivity and lead-free assembly standards?
Yes, the SM5S24AHM3/I meets MSL Level 1 per J-STD-020 with a maximum reflow peak temperature of 245 °C, and features matte tin-plated leads compliant with J-STD-002 and JESD22-B102. The HE3 suffix confirms RoHS compliance, Pb-free termination, and JESD201 Class 2 whisker resistance - fully compatible with modern lead-free reflow processes.
How does the SM5S24AHM3/I compare to older SM5S24A variants?
The SM5S24AHM3/I replaces earlier SM5S24A versions with enhanced manufacturing controls: the "H" denotes AEC-Q101 qualification, "M3" specifies tape-and-reel packaging with anode orientation toward sprocket holes, and "/I" indicates industrial temperature grade (-55 °C to +175 °C). Electrical specs remain identical, but SM5S24AHM3/I guarantees automotive-grade reliability and traceable lot control.
SM5S24AHM3/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):
- 93A
- 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-218AC
SM5S24AHM3/I FAQ
1.How can I place an order for SM5S24AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S24AHM3/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 SM5S24AHM3/I reliable?
The price and inventory of SM5S24AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S24AHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S24AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S24AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S24AHM3/I?
SM5S24AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S24AHM3/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 SM5S24AHM3/I?
For technical support, including SM5S24AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S24AHM3/I requirements.
6.How does Aetrix verify that SM5S24AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S24AHM3/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 SM5S24AHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S24AHM3/I?
All SM5S24AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S24AHM3/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 SM5S24AHM3/I part is unused and in its original packaging.
Return procedure for SM5S24AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S24AHM3/I Tags
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