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Diodes Incorporated ALS8W11A
- Part No.:
- ALS8W11A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W11A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,783
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Product details
Overview
ALS8W11A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 11.1–13.5 V breakdown, 11.0 V standoff, 6600 W peak pulse power (10/1000 µs), and 363 A peak pulse current - designed specifically for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W11A datasheet, ALS8W11A pinout, ALS8W11A application, or ALS8W11A equivalent, this device serves as a high-reliability clamping diode in 12 V automotive systems where thermal stability up to +175 °C, low forward voltage (<1.8 V @ 100 A), and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with anode-connected heatsink configuration, enabling direct mounting to PCB copper pour for enhanced thermal dissipation. Its 6600 W surge rating at 10/1000 µs and 5200 W at 10/10000 µs supports compliance with ISO 16750-2 load dump waveforms under real-world vehicle battery system conditions.
The device exhibits low thermal resistance and stable reverse leakage (<10 µA at VWM, <150 µA at +175 °C), ensuring predictable clamping behavior across automotive temperature extremes. Its DO-218 package delivers mechanical robustness with 2.74 g mass and UL 94V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 11.1 V / 13.5 V - defines precise clamping onset window for reliable overvoltage triggering in 12 V systems |
| VWM | 11.0 V - maximum continuous reverse operating voltage before leakage rises significantly |
| PPPM (10/1000 µs) | 6600 W - enables single-pulse suppression of severe load dump events without failure |
| IPPM | 363 A - peak surge current capability directly tied to clamping voltage of 18.2 V |
| VC @ IPPM | 18.2 V - maximum clamped voltage seen by protected circuit during full-rated surge |
| TJ range | −55 °C to +175 °C - ensures functional integrity in under-hood automotive environments |
| IFSM | 700 A - 8.3 ms half-sine surge current rating supporting high-energy transient handling |
Pinout & Package
Package: DO-218 plastic outline with integrated heatsink terminal; anode connected to heatsink (case), cathode marked by bar on body; polarity critical for correct mounting and thermal path design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive input / thermal interface | Electrically and thermally connected to PCB copper pour; must be soldered to large thermal pad for effective heat transfer |
| Cathode (Bar-marked lead) | Clamped output / surge return path | Connected to protected circuit ground; carries full surge current during transient event |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified, manufactured in IATF 16949 certified facilities for production automotive use |
| High-temperature stability | Reverse leakage remains ≤150 µA at +175 °C, ensuring consistent clamping performance in under-hood locations |
| Low thermal resistance | DO-218 package enables direct heatsink coupling, reducing junction-to-case thermal resistance for sustained surge handling |
| ISO 7637-2 compliance | Validated for Pulse 5a/b load dump testing per ISO 7637-2, meeting OEM-level ECU protection requirements |
| Green manufacturing | Halogen- and antimony-free, RoHS 3 compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb), UL 94V-0 rated molding compound |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting microcontroller power rails and CAN transceivers in gasoline/diesel engine ECUs exposed to alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and local DC/DC input, conducting only during overvoltage surges. Use Value: Limits transient voltage to 18.2 V, preventing damage to 24 V-tolerant LDOs and logic interfaces while maintaining system uptime. |
Use Scenario: Safeguarding BCM power inputs during vehicle start-stop cycling and battery disconnection/reconnection events. IC Role / Device Role / Timing Role: Primary surge suppression element at main 12 V input, absorbing energy before it reaches downstream regulators and communication ICs. Use Value: Withstands 6600 W pulses without degradation, enabling long-term reliability in high-cycle automotive modules. |
| LED Headlamp Driver Protection | ADAS Camera Power Supply |
Use Scenario: Shielding constant-current LED driver ICs from load dump-induced voltage spikes on vehicle battery lines. IC Role / Device Role / Timing Role: Fast-response clamping device placed upstream of buck controller, activated within nanoseconds of overvoltage onset. Use Value: Clamps to 18.2 V before driver IC's absolute maximum rating (typically 20–28 V) is exceeded, avoiding latch-up or gate oxide damage. |
Use Scenario: Securing 5 V/3.3 V camera module power supplies in front-facing ADAS systems subject to harsh electrical environments. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and LC filter, providing final line-of-defense against residual transients. Use Value: Low leakage (<10 µA at 11 V) prevents quiescent current impact on always-on camera wake-up circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower PPPM (400 W), SMA package, 12 V nominal VWM, 19.9 V clamping | Not suitable for ISO 7637-2 Pulse 5; limited to low-energy transients in non-automotive or auxiliary circuits | Select only for cost-sensitive, non-critical 12 V systems where full load dump immunity is not required |
| SMCJ12A | Higher PPPM (1500 W), SMC package, same VWM/VC as SMAJ12A but lower surge capacity than ALS8W11A | Meets ISO 7637-2 Pulse 5a only at reduced test levels; insufficient for full-spec automotive ECU deployment | Acceptable for less demanding automotive sub-systems (e.g., infotainment power input) but not for safety-critical ECUs |
Compared with SMAJ12A and SMCJ12A, ALS8W11A delivers 4.4× and 4.4× higher peak pulse power respectively, with DO-218 thermal design enabling sustained operation at +175 °C - making it the only option qualified for front-line automotive load dump protection in engine bay applications.
Availability
ALS8W11A is available at Aetrix Electronics and suitable for automotive ECU protection, LED headlamp driver circuits, ADAS camera power supplies, and body control module inputs requiring stable component supply across extended production lifecycles.
Supply support for ALS8W11A 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
ALS8W11A belongs to Diodes' automotive-grade TVS diode product line, engineered specifically for high-energy load dump suppression in 12 V vehicle electrical systems - emphasizing thermal robustness, AEC-Q101 compliance, and ISO 7637-2 validation.
FAQ
What is the maximum clamping voltage of ALS8W11A under full-rated surge conditions?
The maximum clamping voltage (VC) of ALS8W11A is 18.2 V when subjected to its rated peak pulse current of 363 A (10/1000 µs waveform). This value is measured at the device terminals under standardized test conditions and represents the highest voltage imposed on the protected circuit during worst-case surge events.
Can ALS8W11A be used in 24 V automotive systems?
No - ALS8W11A is specified for 12 V nominal systems with 11.0 V standoff and 18.2 V clamping. For 24 V systems, Diodes offers ALS8W22A (22.0 V VWM, 35.5 V VC) and higher variants in the same DO-218 family, each optimized for their respective voltage class and surge energy profile.
Is the DO-218 package lead-free and RoHS compliant?
Yes - ALS8W11A features matte tin-plated terminals and a halogen- and antimony-free "Green" molding compound, fully compliant with EU RoHS Directive 2015/863/EU (RoHS 3). It carries a moisture sensitivity level (MSL) rating of Level 1 per J-STD-020 and supports lead-free reflow up to +260 °C for 10 seconds.
Does ALS8W11A require external heat sinking beyond PCB copper pour?
No - the DO-218 package integrates the anode directly into the heatsink terminal, which is designed to be soldered to a minimum 100 mm² copper area on the PCB. This internal thermal path eliminates need for discrete heat sinks while achieving sufficient thermal dissipation for automotive load dump duty cycles.
ALS8W11A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-218AB
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 363A
- 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-218
ALS8W11A FAQ
1.How can I place an order for ALS8W11A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W11A 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 ALS8W11A reliable?
The price and inventory of ALS8W11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W11A is usually 5 days.
3.What payment methods are accepted for ALS8W11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W11A?
ALS8W11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W11A 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 ALS8W11A?
For technical support, including ALS8W11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W11A requirements.
6.How does Aetrix verify that ALS8W11A is sourced from the original manufacturer or authorized distributors?
All ALS8W11A 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 ALS8W11A meets industry standards.
7.What is the process for return or replacement of ALS8W11A?
All ALS8W11A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W11A, 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 ALS8W11A part is unused and in its original packaging.
Return procedure for ALS8W11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W11A Tags
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