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Vishay General Semiconductor - Diodes Division SM8S24AHE3/2D
- Part No.:
- SM8S24AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S24AHE3/2D.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,748
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Product details
Overview
SM8S24AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in 24 V systems. It features a 24.0 V stand-off voltage (VWM), 26.7–29.5 V breakdown range (VBR), 38.9 V clamping voltage at 170 A peak pulse current, and 6600 W peak pulse power (10/1000 µs). Its DO-218AB package supports high-reliability underhood applications up to TJ = 175 °C.
For engineers reviewing the SM8S24AHE3/2D datasheet, SM8S24AHE3/2D pinout, SM8S24AHE3/2D application, or SM8S24AHE3/2D equivalent, key selection criteria include unidirectional polarity, ISO7637-2 compliance for load dump transients, AEC-Q101 qualification, thermal resistance of 0.90 °C/W (junction-to-case), and low leakage (<10 µA at VWM).
Technical Context
The SM8S24AHE3/2D employs passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its unidirectional configuration uses the metal heatsink as anode, enabling efficient thermal dissipation during 10/1000 µs transients up to 6600 W.
It delivers 170 A peak pulse current with 38.9 V clamping at IPPM, maintains <10 µA reverse leakage at 24.0 V stand-off, and sustains operation across –55 °C to +175 °C junction temperature - meeting automotive-grade reliability requirements per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum continuous reverse operating voltage before clamping begins; defines system nominal bus voltage compatibility. |
| VBR min/max | 26.7 V / 29.5 V - Breakdown voltage range at 5 mA test current; ensures consistent turn-on threshold across production lot. |
| VC @ IPPM | 38.9 V - Clamping voltage at 170 A peak pulse; limits downstream IC stress during ISO7637-2 load dump events. |
| PPPM (10/1000 µs) | 6600 W - Peak pulse power handling capability; enables single-event suppression of high-energy automotive transients. |
| RθJC | 0.90 °C/W - Junction-to-case thermal resistance; allows direct mounting to PCB copper pour or heatsink for thermal management. |
| TJ max | +175 °C - Maximum junction temperature rating; supports underhood placement in engine control units and body controllers. |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation in series with protected line for forward-biased conduction path. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with integral metal heatsink (anode terminal), UL 94 V-0 molding compound, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery feed); conducts during overvoltage event to shunt current to anode/heatsink. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical return; must be soldered to large copper area or external heatsink for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage over lifetime and temperature cycling. |
| AEC-Q101 qualification | Validated for automotive use including HTOL, TC, UHAST, and ESD testing - required for powertrain and chassis modules. |
| ISO7637-2 compliance | Rated for load dump waveforms (10 ms exponential) up to 5200 W (10/10,000 µs), supporting OEM-level EMC requirements. |
| MSL Level 1 | Moisture sensitivity level 1 per J-STD-020 - no dry-pack or bake required prior to reflow assembly. |
| Low VF | ≤1.8 V forward voltage at 100 A surge - minimizes conduction loss and self-heating during repetitive clamping events. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Line Protection |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and analog sensors from 12 V/24 V load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor; clamps within nanoseconds to limit voltage to safe levels. Use Value: Enables reliable operation at TJ = 175 °C without derating, preserving system uptime in high-ambient underhood environments. | Use Scenario: Shields LIN transceivers, door lock actuators, and lighting drivers from switching surges induced by relays and motors in vehicle body networks. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 24 V supply rail; coordinates with upstream fuses and downstream LC filters. Use Value: 6600 W peak pulse rating absorbs worst-case ISO7637-2 Pulse 5a without degradation, extending field life beyond 15-year automotive service intervals. |
| ADAS Camera Power Supply Protection | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Safeguards image sensor and ISP power rails against coupled transients from nearby high-current loads (e.g., radar, infotainment). IC Role / Device Role / Timing Role: Secondary TVS after primary DC/DC converter; provides fast-response backup clamping for sensitive analog front-ends. Use Value: Low 38.9 V clamping voltage prevents latch-up in 3.3 V or 5 V LDOs feeding CMOS image sensors. | Use Scenario: Protects gate drivers and current-sense amplifiers from inductive kickback generated by EPS motor commutation. IC Role / Device Role / Timing Role: High-energy TVS mounted directly at motor driver power input; interfaces with heatsinked PCB copper for thermal stability. Use Value: 0.90 °C/W RθJC enables sustained 8 W power dissipation on 2 oz copper, eliminating need for discrete heatsinks in space-constrained EPS housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/5AT | Lower PPPM (400 W vs. 6600 W), SMA package (RθJC ≈ 45 °C/W), 24 V VWM, same AEC-Q101 qualification | Not suitable for load dump; limited to ESD and low-energy switching transients | Select only for non-automotive 24 V systems with <500 W surge exposure. |
| TPSMD24A | Same DO-218AB package, 6600 W PPPM, but higher VC (42.1 V vs. 38.9 V) and wider VBR (26.7–32.6 V) | Higher clamping increases stress on downstream 3.3 V/5 V regulators; less margin for tight-rail designs | Acceptable where 3.3 V logic tolerance >10% or where higher VBR spread is acceptable for cost optimization. |
Compared with SMAJ24A-E3/5AT and TPSMD24A, the SM8S24AHE3/2D delivers superior thermal performance (0.90 °C/W), tighter VBR tolerance (26.7–29.5 V), and lower clamping (38.9 V), making it the preferred choice for high-reliability 24 V automotive load dump protection where voltage margin and thermal headroom are critical.
Availability
SM8S24AHE3/2D is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across long-life automotive programs.
Supply support for SM8S24AHE3/2D 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on automotive, industrial, and computing applications.
The SM8SxxA family is engineered specifically for high-energy automotive transient suppression, targeting ISO7637-2 load dump compliance and AEC-Q101 qualification in thermally demanding underhood environments.
FAQ
What is the maximum clamping voltage of the SM8S24AHE3/2D at its rated peak pulse current?
The SM8S24AHE3/2D has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 170 A under the 10/1000 µs waveform. This value is measured at TC = 25 °C and guarantees that downstream circuitry remains below destructive voltage thresholds during standardized load dump events. The SM8S24AHE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM8S24AHE3/2D suitable for bidirectional transient protection?
No, the SM8S24AHE3/2D is a unidirectional TVS diode, with the metal heatsink serving as the anode and Lead 1 as the cathode. It conducts only during positive overvoltage events on the cathode relative to the anode. For bidirectional protection, a separate device such as the SMBJ24CA or a dual-diode configuration would be required. The SM8S24AHE3/2D datasheet explicitly states "Available in uni-directional polarity only".
Does the SM8S24AHE3/2D meet AEC-Q101 qualification, and what does that cover?
Yes, the SM8S24AHE3/2D is AEC-Q101 qualified, as confirmed in the Vishay document 88387. This qualification includes stress tests for high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and electrostatic discharge (HBM and CDM). It validates suitability for automotive powertrain, chassis, and body electronics where reliability under thermal and mechanical stress is mandatory.
What is the thermal resistance from junction to case (RθJC) for the SM8S24AHE3/2D, and why does it matter?
The SM8S24AHE3/2D has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W. This low value reflects its DO-218AB package's integrated metal heatsink, enabling efficient heat transfer from the silicon die to the PCB copper pour or external heatsink. In practice, this allows the SM8S24AHE3/2D to sustain its 8 W steady-state power dissipation without exceeding TJ = 175 °C - critical for underhood applications where ambient temperatures exceed 125 °C.
How does the SM8S24AHE3/2D differ from the non-A version (SM8S24HE3/2D)?
The SM8S24AHE3/2D has a tighter breakdown voltage tolerance (26.7–29.5 V) compared to the SM8S24HE3/2D (26.7–32.6 V), due to its ±5 % VBR specification versus ±10 %. This results in more predictable clamping onset and reduced variation in protection threshold across production lots. Both share identical package, power ratings, and AEC-Q101 qualification, but the 'A' suffix denotes enhanced VBR consistency required for precision-sensitive automotive subsystems.
SM8S24AHE3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- 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):
- 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
SM8S24AHE3/2D FAQ
1.How can I place an order for SM8S24AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S24AHE3/2D 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 SM8S24AHE3/2D reliable?
The price and inventory of SM8S24AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S24AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S24AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S24AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S24AHE3/2D?
SM8S24AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S24AHE3/2D 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 SM8S24AHE3/2D?
For technical support, including SM8S24AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S24AHE3/2D requirements.
6.How does Aetrix verify that SM8S24AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S24AHE3/2D 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 SM8S24AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S24AHE3/2D?
All SM8S24AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S24AHE3/2D, 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 SM8S24AHE3/2D part is unused and in its original packaging.
Return procedure for SM8S24AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S24AHE3/2D Tags
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