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Vishay General Semiconductor - Diodes Division SM6S24ATHE3/I
- Part No.:
- SM6S24ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S24ATHE3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,728
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Product details
Overview
SM6S24ATHE3/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), 26.7–29.5 V breakdown voltage (VBR) at 5 mA, 38.9 V clamping voltage (VC) at 118 A peak pulse current, and 4600 W peak pulse power (10/1000 μs). Its DO-218AC package supports TJ = 175 °C operation and AEC-Q101 qualification.
For engineers reviewing the SM6S24ATHE3/I datasheet, SM6S24ATHE3/I pinout, SM6S24ATHE3/I application, or SM6S24ATHE3/I equivalent, key selection criteria include unidirectional polarity, 175 °C junction rating, ISO7637-2 compliance for load dump transients, low leakage (<10 μA at VWM), and DO-218AC thermal performance with RθJC = 0.95 °C/W.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge stress at elevated temperatures. Its unidirectional configuration places the heatsink as the anode terminal, enabling direct mounting to chassis ground for optimal thermal dissipation during 10 ms exponential load dump events.
The device meets MSL Level 1 per J-STD-020 (245 °C peak reflow), supports 600 A non-repetitive forward surge current (IFSM), and exhibits a +0.087 %/°C temperature coefficient of VBR - enabling predictable voltage shift across -55 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum continuous reverse working voltage before clamping begins; defines system operating margin in 24 V automotive circuits. |
| VBR (min/typ/max) | 26.7 / 28.1 / 29.5 V at 5 mA - Verified breakdown threshold ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 38.9 V at 118 A (10/1000 μs) - Clamping voltage limits downstream IC stress during ISO7637-2 load dump surges. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling capacity enables single-event suppression of severe automotive transients. |
| TJ max. | +175 °C - Enables placement near hot engine-control units without derating; validated per AEC-Q101 stress testing. |
| RθJC | 0.95 °C/W - Low thermal resistance from junction to case allows efficient heat transfer to heatsink or PCB copper pour. |
| Leakage @ VWM | <10 μA at 25 °C - Minimizes standby power loss and avoids false triggering in always-on vehicle modules. |
Pinout & Package
Package: DO-218AC - Surface-mount, anode-heatsink configuration with matte tin-plated leads; meets UL 94 V-0, J-STD-002 solderability, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery rail); carries full surge current during clamping. |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to chassis ground; serves as primary heat path and circuit reference. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood environments including temperature cycling, HTRB, and surge endurance per stress test plan. |
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and immunity to humidity-induced degradation. |
| ISO7637-2 compliance | Rated for load dump waveforms (test condition dependent); clamps 10 ms exponential surges up to 4600 W at TC = 25 °C. |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 245 °C peak, eliminating moisture sensitivity handling requirements. |
| Low VF | Max 1.9 V at 100 A (8.3 ms half-sine) - minimizes forward conduction loss during bidirectional surge events. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of 24 V supply input against alternator load dump transients during battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤38.9 V, preventing damage to 40 V-rated input MOSFETs and LDOs in ECU power stage. |
Use Scenario: Safeguarding LIN bus power supply and microcontroller I/O lines from switching noise generated by door lock actuators and window motors. IC Role / Device Role / Timing Role: Primary rail-level surge suppressor on 12/24 V switched power domain feeding BCM sub-circuits. Use Value: Withstands 600 A IFSM and maintains <10 μA leakage at 24 V, ensuring low-power sleep mode integrity. |
| Commercial Vehicle Telematics Unit | Truck HVAC Control System |
Use Scenario: Input protection for GPS/GSM module power input exposed to harsh cab electrical environment with frequent ignition cycling. IC Role / Device Role / Timing Role: First-line transient suppressor on main 24 V input before fuse and filtering stage. Use Value: 175 °C TJ rating enables direct placement near power entry connector without thermal derating in sealed enclosures. |
Use Scenario: Clamping induced spikes from blower motor relays and compressor clutch engagement in 24 V HVAC control boards. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to relay driver IC output pins. Use Value: DO-218AC anode-heatsink design allows direct thermal coupling to metal chassis, reducing transient thermal impedance by >40% vs. SO-8 alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S24AHM3 | Same VWM/VBR/VC specs; HM3 suffix indicates halogen-free, matte tin finish with enhanced whisker resistance (JESD201 Class 2). | Identical load dump performance; preferred for new designs requiring RoHS+halogen-free compliance beyond HE3 baseline. | Select SM6S24AHM3 for new automotive programs where long-term whisker mitigation and material sustainability are mandated. |
| SMAJ24A | Lower PPPM (400 W vs. 4600 W); SMA package (DO-214AC) with higher RθJA (~50 °C/W); no AEC-Q101 qualification. | Not suitable for load dump; limited to lower-energy ESD/inductive spike suppression in non-automotive industrial controls. | Use SMAJ24A only in cost-sensitive, non-automotive applications with <500 W surge requirements and no 175 °C or AEC-Q101 needs. |
Compared with SM6S24AHM3, the SM6S24ATHE3/I offers identical electrical performance but lacks halogen-free certification; versus SMAJ24A, it delivers 11.5× higher surge power, 50× better thermal resistance, and automotive-grade reliability - making it irreplaceable for under-hood 24 V load dump protection.
Availability
SM6S24ATHE3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, commercial telematics systems, and heavy-duty HVAC controllers requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SM6S24ATHE3/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 SM6SxxAT family was engineered specifically for AEC-Q101-compliant automotive load dump protection, emphasizing high-temperature stability (175 °C), robust surge capability (4600 W), and DO-218AC thermal efficiency in space-constrained ECUs.
FAQ
What is the maximum clamping voltage of the SM6S24ATHE3/I under standard test conditions?
The SM6S24ATHE3/I has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 μs waveform at 118 A peak pulse current. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM6S24ATHE3/I maintains this clamping performance across its full operating temperature range due to its +0.087 %/°C VBR temperature coefficient.
Is the SM6S24ATHE3/I suitable for 12 V automotive systems?
No - the SM6S24ATHE3/I is optimized for 24 V nominal systems. Its 24.0 V stand-off voltage (VWM) provides appropriate margin above 24 V battery rails while avoiding false triggering during normal operation. For 12 V systems, Vishay recommends SM6S12ATHE3/I (VWM = 12.0 V) or SM6S13ATHE3/I (VWM = 13.0 V), which match the lower voltage envelope and offer equivalent surge ratings and AEC-Q101 qualification.
Does the SM6S24ATHE3/I require a heatsink for rated power dissipation?
The SM6S24ATHE3/I does not require an external heatsink for its 6 W steady-state power dissipation (PD) when mounted on a minimum 1 in² (6.5 cm²) copper pad with two thermal vias - thanks to its DO-218AC package and 0.95 °C/W junction-to-case thermal resistance. However, for sustained 4600 W transient suppression, thermal mass from the PCB copper pour and chassis contact via the anode heatsink is essential to absorb short-duration energy without exceeding TJ = 175 °C.
What does the "HE3" suffix indicate in SM6S24ATHE3/I?
The "HE3" suffix in SM6S24ATHE3/I denotes RoHS-compliant construction with matte tin-plated leads, JESD201 Class 2 whisker resistance, and AEC-Q101 qualification. It also specifies packaging in 13″ plastic tape and reel (750 pcs per reel), with anode oriented toward sprocket holes. The "I" suffix indicates the preferred packaging code per Vishay's ordering matrix, confirming tape-and-reel delivery format.
Can the SM6S24ATHE3/I replace older SM6S24A variants in existing designs?
Yes - the SM6S24ATHE3/I is a direct replacement for legacy SM6S24A parts in terms of electrical specifications, package dimensions, and pinout. It retains identical VWM (24.0 V), VBR (26.7–29.5 V), VC (38.9 V), and DO-218AC mechanical outline. The HE3 suffix adds RoHS compliance, AEC-Q101 validation, and improved whisker resistance, making it suitable for drop-in upgrades in automotive production without layout or firmware changes.
SM6S24ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SM6S24ATHE3/I FAQ
1.How can I place an order for SM6S24ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S24ATHE3/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 SM6S24ATHE3/I reliable?
The price and inventory of SM6S24ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S24ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM6S24ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S24ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S24ATHE3/I?
SM6S24ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S24ATHE3/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 SM6S24ATHE3/I?
For technical support, including SM6S24ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S24ATHE3/I requirements.
6.How does Aetrix verify that SM6S24ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM6S24ATHE3/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 SM6S24ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM6S24ATHE3/I?
All SM6S24ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S24ATHE3/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 SM6S24ATHE3/I part is unused and in its original packaging.
Return procedure for SM6S24ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S24ATHE3/I Tags
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