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Vishay General Semiconductor - Diodes Division SM6S24AHM3/I
- Part No.:
- SM6S24AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S24AHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,684
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Product details
Overview
SM6S24AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, designed for automotive load dump protection with 24 V stand-off voltage (VWM), 28.1 V nominal breakdown voltage (VBR), and 4600 W peak pulse power (10/1000 μs). It operates up to TJ = 175 °C and is AEC-Q101 qualified.
For engineers reviewing the SM6S24AHM3/I datasheet, SM6S24AHM3/I pinout, SM6S24AHM3/I application, or SM6S24AHM3/I equivalent, key selection criteria include clamping voltage (VC = 38.9 V at IPPM), low leakage (<10 μA at VWM), high surge current capability (IPPM = 118 A), and compliance with ISO7637-2 for automotive transients.
Technical Context
The SM6S24AHM3/I uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress at elevated junction temperatures. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to thermal planes for efficient heat dissipation in high-power transient events.
It delivers 4600 W peak pulse power with 10/1000 μs waveform and maintains ≤38.9 V clamping voltage at rated IPPM, supporting robust protection of 24 V automotive ECUs against load dump and inductive switching transients per ISO7637-2 test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 24 V rail protection. |
| VBR (nom) | 28.1 V - Breakdown voltage at 5 mA test current; defines onset of avalanche conduction during transient events. |
| VC @ IPPM | 38.9 V - Clamping voltage at 118 A peak pulse current; ensures downstream ICs see <39 V during worst-case surges. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling capacity; enables single-event suppression of high-energy automotive load dump pulses. |
| TJ max. | 175 °C - Maximum junction temperature rating; supports operation in under-hood environments without derating. |
| ID @ VWM | <10 μA - Reverse leakage at 24 V; minimizes standby power loss and avoids false triggering in battery-sensitive systems. |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD; required for Tier-1 ECU designs. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink terminal (anode), matte tin-plated leads, UL 94 V-0 flammability rating, MSL Level 1 (245 °C reflow peak), and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive terminal / thermal interface | Electrically connected to metal heatsink base; must be soldered to large copper pour for thermal management and low RθJM (0.45 °C/W). |
| Cathode (Lead 1) | Negative terminal / transient return path | Connected to protected circuit ground; carries full surge current during clamping; requires low-inductance PCB routing. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature, critical for long-term automotive field reliability. |
| High-temperature operation | Rated for continuous operation at TJ = 175 °C, enabling placement near hot components (e.g., power MOSFETs, DC/DC converters) without thermal derating. |
| ISO7637-2 compliance | Validated for Pulse 5a/b load dump waveforms; provides system-level immunity without external filtering or additional TVS staging. |
| Low forward voltage drop | VF ≤ 1.9 V at 100 A (300 μs pulse); reduces conduction losses during bidirectional surge events where forward conduction may occur. |
| Unidirectional polarity | Prevents reverse-bias leakage on positive rails; eliminates need for series diode in 24 V supply protection schemes. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protects BCM microcontroller and CAN transceivers from alternator load dump spikes during battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Primary clamping device on 24 V main input rail; responds within nanoseconds to limit voltage to safe levels. Use Value: Enables direct connection to vehicle battery without external RC snubbers; VC = 38.9 V ensures MCU IO tolerance margin remains intact. |
Use Scenario: Shields ECU power supply from high-energy transients generated by fuel injector or solenoid valve switching. IC Role / Device Role / Timing Role: Fast-acting shunt protector placed upstream of DC/DC converter input; clamps before input capacitor overvoltage. Use Value: 4600 W PPPM handles >100 A surge currents typical of ISO7637-2 Pulse 5a, preventing brownout or latch-up in safety-critical engine logic. |
| Commercial Vehicle Telematics Unit | Off-Highway Equipment Battery Management |
Use Scenario: Secures LTE/GPS module power input in fleet tracking devices exposed to harsh 24 V truck electrical systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary 24 V input; coordinates with secondary TVS on USB/CAN lines for layered protection. Use Value: AEC-Q101 qualification guarantees performance across -40 °C to +125 °C ambient, matching telematics unit thermal profile. |
Use Scenario: Guards BMS supervisor ICs and cell monitor ICs against transients induced by hydraulic pump motor commutation in construction machinery. IC Role / Device Role / Timing Role: High-reliability transient clamp on auxiliary 24 V supply feeding isolated analog front-ends. Use Value: 175 °C TJ rating allows mounting directly on BMS PCB near power stage, eliminating thermal interface layers while maintaining clamping integrity. |
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 vs. 4600 W), SMA package (DO-214AC), 24 V VWM, unidirectional, AEC-Q101 qualified. | Targeted at lower-energy transients (e.g., ESD, I/O line protection); insufficient for load dump in 24 V systems. | Select SMAJ24AHE3/A only for non-load-dump applications where board space is constrained and surge energy is <500 W. |
| SM6T24AHM3/A | Same DO-218AB package, 24 V VWM, but bidirectional polarity; identical PPPM (4600 W), VBR (28.1 V), and VC (38.9 V). | Required where AC-coupled or dual-polarity transients exist (e.g., LIN bus, sensor inputs); not suitable for DC rail protection without polarity awareness. | Choose SM6T24AHM3/A only when protecting bidirectional signal lines; SM6S24AHM3/I remains optimal for 24 V DC power rail clamping. |
Compared with SMAJ24AHE3/A and SM6T24AHM3/A, the SM6S24AHM3/I uniquely combines 4600 W load dump capability, unidirectional polarity, and DO-218AB thermal performance-making it the only option among the three qualified for primary 24 V automotive power rail protection per ISO7637-2 Pulse 5.
Availability
SM6S24AHM3/I is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, commercial vehicle telematics, and off-highway equipment battery management systems requiring stable component supply and AEC-Q101 assurance.
Supply support for SM6S24AHM3/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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM6SxxA family was engineered specifically for high-energy automotive load dump protection, emphasizing thermal robustness (TJ = 175 °C), ISO7637-2 compliance, and DO-218AB package efficiency in under-hood environments.
FAQ
What is the clamping voltage of the SM6S24AHM3/I at its rated peak pulse current?
The SM6S24AHM3/I has a maximum clamping voltage (VC) of 38.9 V at its rated peak pulse current (IPPM) of 118 A under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures protected circuits remain below critical voltage thresholds during automotive load dump events. The SM6S24AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM6S24AHM3/I suitable for use in automotive applications requiring AEC-Q101 qualification?
Yes, the SM6S24AHM3/I is explicitly AEC-Q101 qualified, as confirmed in Vishay's official documentation (Document Number: 88384). It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to meet automotive reliability requirements. The SM6S24AHM3/I is approved for use in safety-critical systems such as engine control units and body control modules.
What package type does the SM6S24AHM3/I use, and why is it important for thermal performance?
The SM6S24AHM3/I uses the DO-218AB package, which features an integrated metal heatsink terminal serving as the anode. This design achieves a low junction-to-mount thermal resistance (RθJM = 0.45 °C/W), enabling efficient heat transfer to the PCB copper pour. The DO-218AB package is essential for sustaining 4600 W surge events without thermal runaway, especially in high-ambient automotive environments.
How does the SM6S24AHM3/I differ from the SM6T24AHM3/A variant?
The SM6S24AHM3/I is unidirectional, while the SM6T24AHM3/A is bidirectional-meaning the latter conducts in both directions and is intended for AC or differential signal protection. Both share identical VWM (24 V), PPPM (4600 W), and VC (38.9 V), but the SM6S24AHM3/I's unidirectional polarity makes it optimal for 24 V DC power rail protection without risk of unintended forward conduction.
Does the SM6S24AHM3/I meet ISO7637-2 requirements for automotive transient immunity?
Yes, the SM6S24AHM3/I is validated to meet ISO7637-2 requirements for Pulse 5a and 5b (load dump) under specified test conditions. Its 4600 W peak pulse power rating and 38.9 V clamping voltage ensure compliance with the standard's voltage limiting and energy absorption mandates for 24 V vehicle systems. This validation is documented in Vishay's application notes and datasheet curves.
SM6S24AHM3/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):
- 118A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
SM6S24AHM3/I FAQ
1.How can I place an order for SM6S24AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S24AHM3/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 SM6S24AHM3/I reliable?
The price and inventory of SM6S24AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S24AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6S24AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S24AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S24AHM3/I?
SM6S24AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S24AHM3/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 SM6S24AHM3/I?
For technical support, including SM6S24AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S24AHM3/I requirements.
6.How does Aetrix verify that SM6S24AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6S24AHM3/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 SM6S24AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6S24AHM3/I?
All SM6S24AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S24AHM3/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 SM6S24AHM3/I part is unused and in its original packaging.
Return procedure for SM6S24AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S24AHM3/I Tags
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