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Vishay General Semiconductor - Diodes Division SM8S24A-001HE3_A/I
- Part No.:
- SM8S24A-001HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S24A-001HE3_A/I.pdf
- Description:
- TVS DIODE 24VWM DO218AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM8S24A-001HE3_A/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 (VBR), and 6600 W peak pulse power (10/1000 μs), designed for automotive load dump protection in high-reliability 12 V systems.
For engineers reviewing the SM8S24A-001HE3_A/I datasheet, SM8S24A-001HE3_A/I pinout, SM8S24A-001HE3_A/I application, or SM8S24A-001HE3_A/I equivalent, key selection criteria include AEC-Q101 qualification, TJ = 175 °C operation, low leakage (<10 μA at VWM), clamping voltage of 38.9 V at 170 A, and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with heatsink-connected anode polarity, enabling robust surge handling under high-temperature conditions. Its junction-to-mount thermal resistance is 0.35 °C/W, supporting efficient heat transfer to PCB copper or external heatsinks in automotive power electronics.
The device delivers 170 A peak pulse current (10/1000 μs) while clamping at ≤38.9 V, limiting voltage stress on downstream DC/DC converters and microcontrollers during load dump events. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing via its matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before conduction; defines system bus voltage rating for 12 V automotive applications. |
| VBR (nom) | 28.1 V - Breakdown voltage at 5 mA test current; ensures reliable turn-on margin above VWM for transient suppression. |
| VC @ IPPM | 38.9 V - Clamping voltage at 170 A peak pulse; limits voltage seen by protected ICs during ISO7637-2 load dump surges. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power capability; enables survival of high-energy transients without failure. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood placement and long-term reliability in automotive environments. |
| ID @ VWM | <10 μA - Reverse leakage at rated stand-off voltage; minimizes standby power loss in always-on vehicle modules. |
| RθJM | 0.35 °C/W - Junction-to-mount thermal resistance; allows effective thermal coupling to PCB copper pour or heatsink for sustained power dissipation. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink tab (anode), UL 94 V-0 compliant molding compound, and matte tin-plated leads solderable per J-STD-002/JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Current entry point during clamping; electrically connected to metal base | Must be soldered to large copper area or external heatsink for thermal management and low-inductance surge path. |
| Cathode (Lead 1) | Current exit point during clamping; marked side of device | Connected to protected circuit node (e.g., input rail of DC/DC converter); polarity must match system grounding scheme. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Junction passivation optimized design | Reduces parameter drift over time and improves long-term stability under thermal stress and humidity exposure. |
| Meets ISO7637-2 surge specification | Rated for load dump pulses up to 10 ms exponential waveform, critical for 12 V battery system protection. |
| MSL Level 1, LF peak 245 °C | Compatible with standard lead-free reflow profiles without moisture-related cracking risk. |
| Low forward voltage drop | VF ≤ 1.8 V at 100 A (300 μs pulse) - minimizes conduction losses during high-current clamping events. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input Protection |
|---|---|
Use Scenario: Protects BCM power rails from load dump transients generated by alternator field coil de-energization during ignition-off events. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed at 12 V input stage before DC/DC converter and LDO regulators. Use Value: Limits input voltage to ≤38.9 V during 6600 W surges, preventing damage to 40 V-rated power management ICs and MCU supply pins. |
Use Scenario: Shields ECU main power input against ISO7637-2 Pulse 5a/b load dump and jump-start surges in gasoline/diesel engine bays. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery feed line, mounted directly to heatsinked PCB copper pour. Use Value: Enables operation up to +175 °C junction temperature and withstands repeated 170 A pulses without degradation, ensuring functional safety compliance. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Control Board |
Use Scenario: Guards 12 V input to image sensor and ISP power chain in rear-view or surround-view cameras exposed to vehicle-level transients. IC Role / Device Role / Timing Role: Fast-response TVS suppressing sub-microsecond rise-time spikes induced by nearby solenoid switching. Use Value: Low leakage (<10 μA) avoids signal noise injection; DO-218AB package provides mechanical robustness in vibration-prone mounting locations. |
Use Scenario: Protects EPS motor driver and MCU power rails from load dump and inductive kickback during steering assist actuation. IC Role / Device Role / Timing Role: High-surge-capability TVS integrated into multi-layer PCB with dedicated thermal vias to inner ground plane. Use Value: 0.35 °C/W RθJM enables stable thermal performance under continuous 8 W power dissipation, supporting ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S24AHM3 | Same electrical specs and DO-218AB package; HM3 suffix indicates enhanced material set and tighter process control per AEC-Q101 revision G. | Identical use cases; preferred for new designs requiring latest qualification baseline and extended lifecycle support. | Select SM8S24AHM3 for new automotive programs where long-term component availability and updated stress-test coverage are required. |
| SMAJ24A | Lower PPPM (400 W vs. 6600 W), SMA package (DO-214AC), higher RθJA (95 °C/W), not AEC-Q101 qualified. | Limited to low-energy industrial or consumer applications; unsuitable for automotive load dump due to insufficient surge rating. | Use SMAJ24A only in non-automotive, low-power systems where cost is prioritized over surge robustness and qualification. |
Compared with SM8S24A-001HE3_A/I, SM8S24AHM3 offers identical protection performance with improved manufacturing traceability and qualification rigor, while SMAJ24A falls short in energy handling, thermal performance, and automotive compliance-making it a non-substitutable alternative in safety-critical designs.
Availability
SM8S24A-001HE3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and ADAS power supply designs requiring stable component supply, AEC-Q101 validation, and high-temperature operational continuity.
Supply support for SM8S24A-001HE3_A/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 SM8S series is part of Vishay's PAR® TVS platform, engineered specifically for high-energy automotive load dump protection with AEC-Q101 qualification, 175 °C operation, and ISO7637-2 compliance.
FAQ
What is the maximum clamping voltage of the SM8S24A-001HE3_A/I at its rated peak pulse current?
The SM8S24A-001HE3_A/I has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 170 A under the 10/1000 μs waveform. This value is measured per the conditions specified in the Vishay datasheet (Document Number 88387, page 2) and ensures downstream components see limited overvoltage during transient events. The SM8S24A-001HE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SM8S24A-001HE3_A/I suitable for new automotive designs?
No-the SM8S24A-001HE3_A/I is marked "Not For New Designs" in the Vishay datasheet, with SM8S24AHM3 recommended as the alternative. While the SM8S24A-001HE3_A/I remains fully qualified (AEC-Q101) and functional, Vishay advises new designs use the HM3 variant for updated process controls, extended lifecycle support, and alignment with current qualification baselines. The SM8S24A-001HE3_A/I continues to be supported for legacy program continuity.
What does the "HE3_A/I" suffix indicate in SM8S24A-001HE3_A/I?
The "HE3_A/I" suffix in SM8S24A-001HE3_A/I decodes as follows: HE3 denotes RoHS-compliant, halogen-free, Pb-free termination with JESD201 Class 2 whisker resistance; "A" is the revision code; and "I" specifies the packaging format-750-unit 13-inch plastic tape and reel with anode oriented toward sprocket holes. This matches the ordering information table in Vishay document 88387, page 3.
How is thermal management implemented for the SM8S24A-001HE3_A/I in high-power applications?
The SM8S24A-001HE3_A/I uses its metal heatsink tab (anode) as the primary thermal path, with a specified RθJM of 0.35 °C/W. Effective thermal management requires soldering the tab to ≥100 mm² of 2 oz. copper on the PCB, optionally augmented with thermal vias to internal ground planes. This configuration enables safe dissipation of its 8 W steady-state power rating and supports repetitive 6600 W surge events without exceeding the +175 °C TJ limit.
Does the SM8S24A-001HE3_A/I meet ISO7637-2 requirements for automotive load dump?
Yes-the SM8S24A-001HE3_A/I is explicitly stated in the Vishay datasheet to meet ISO7637-2 surge specifications, validated for load dump waveforms including the 10 ms exponential pulse (Fig. 3). Its 6600 W peak pulse power rating and 38.9 V clamping voltage at 170 A ensure compliance with Pulse 5a/b test levels for 12 V systems. This makes the SM8S24A-001HE3_A/I suitable for front-end protection in automotive ECUs, BCMs, and ADAS modules.
SM8S24A-001HE3_A/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:
- 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
SM8S24A-001HE3_A/I FAQ
1.How can I place an order for SM8S24A-001HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S24A-001HE3_A/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 SM8S24A-001HE3_A/I reliable?
The price and inventory of SM8S24A-001HE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S24A-001HE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S24A-001HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S24A-001HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S24A-001HE3_A/I?
SM8S24A-001HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S24A-001HE3_A/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 SM8S24A-001HE3_A/I?
For technical support, including SM8S24A-001HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S24A-001HE3_A/I requirements.
6.How does Aetrix verify that SM8S24A-001HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S24A-001HE3_A/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 SM8S24A-001HE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S24A-001HE3_A/I?
All SM8S24A-001HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S24A-001HE3_A/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 SM8S24A-001HE3_A/I part is unused and in its original packaging.
Return procedure for SM8S24A-001HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S24A-001HE3_A/I Tags
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