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Diodes Incorporated ALS5W11A
- Part No.:
- ALS5W11A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W11A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:6,772
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Product details
Overview
ALS5W11A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 11.0 V standoff voltage, 12.2–13.5 V breakdown, 3600 W peak pulse power (10/1000 µs), and 198 A peak pulse current - designed specifically for automotive ECU load dump protection where high-temperature stability and low clamping voltage (18.2 V) are critical.
For engineers reviewing the ALS5W11A datasheet, ALS5W11A pinout, ALS5W11A application, or ALS5W11A equivalent, this device serves as a primary clamping diode in 12 V automotive systems requiring AEC-Q101 qualification, ISO7637-2 compliance, and robust surge handling up to 500 A forward surge current under 8.3 ms half-sine waveform.
Technical Context
The ALS5W11A operates as a unidirectional TVS diode with anode-connected heatsink configuration, optimized for load dump transients defined by exponential 10 ms waveforms per ISO16750-2. Its thermal design supports continuous operation from –55 °C to +175 °C junction temperature, with low thermal resistance enabling stable clamping at elevated case temperatures.
It delivers 18.2 V maximum clamping voltage at 198 A IPPM, achieving <2.0 V forward voltage at 100 A (8.3 ms), and maintains ≤10 µA reverse leakage at 11.0 V standoff - ensuring minimal standby power loss while preserving fast response to sub-microsecond voltage spikes induced by inductive switching in automotive lighting and power modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11.0 V - Standoff voltage threshold before conduction begins; ensures no leakage during normal 12 V system operation. |
| VBR (min/max) | 12.2 V / 13.5 V - Verified breakdown range at 5 mA test current; guarantees reliable turn-on within automotive supply tolerance. |
| VC @ IPPM | 18.2 V - Clamping voltage at 198 A peak pulse; limits downstream IC stress below 20 V during load dump events. |
| PPPM (10/1000 µs) | 3600 W - Peak pulse power rating; sustains single high-energy transients without failure. |
| IFSM | 500 A - Forward surge current capability (8.3 ms half-sine); handles repetitive inrush and switching surges in power distribution circuits. |
| Junction Temp Range | –55 °C to +175 °C - Enables deployment in engine bay and transmission control units without derating. |
Pinout & Package
DO-218 plastic package with integrated heatsink; anode terminal connected to heatsink base, cathode marked by bar on top surface. Matte tin-plated terminals compliant with MIL-STD-750 Method 2026 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Base) | Power Input / Thermal Path | Electrically and thermally connects to PCB copper pour; must be soldered to ≥200 mm² thermal pad for rated power dissipation. |
| Cathode (Top Surface Bar) | Clamping Output / Surge Return | Connected to protected circuit ground; carries full transient current during load dump event. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q101 qualified and PPAP capable - meets production release requirements for Tier-1 automotive electronics. |
| Surge Compliance | Fully compliant with ISO7637-2 and ISO16750-2 load dump test profiles - validated for 12 V system applications. |
| Thermal Performance | Low thermal resistance enables 3600 W pulse handling at 125 °C case temperature - verified via Fig.1 derating curve. |
| Environmental Compliance | RoHS 3 compliant, halogen- and antimony-free "Green" construction - satisfies EU Directive 2015/863/EU. |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller and CAN transceiver inputs in gasoline/diesel ECUs exposed to alternator load dump transients. IC Role / Device Role / Timing Role: Clamping diode placed between battery rail and protected IC power input. Use Value: Limits voltage excursion to ≤18.2 V during 3600 W transient, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. | Use Scenario: Shields LED driver ICs and current-sense amplifiers in adaptive front-lighting systems (AFS) during ignition cycling. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V input rail upstream of buck controller. Use Value: Maintains <10 µA leakage at 11.0 V, avoiding false dimming commands while clamping 198 A surges within 100 ns. |
| Body Control Module (BCM) | Start-Stop System Relay Driver |
Use Scenario: Safeguards LIN transceivers and power MOSFET gate drivers in door module and seat control units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on switched 12 V supply feeding multiple subsystems. Use Value: Withstands repeated 500 A forward surge events without parameter shift, supporting 15-year vehicle lifecycle. | Use Scenario: Protects high-side switch ICs controlling starter solenoid and battery disconnect relays during engine cranking. IC Role / Device Role / Timing Role: Anode-to-battery, cathode-to-switch input; absorbs inductive kickback from relay coil de-energization. Use Value: Achieves 18.2 V clamping at 198 A, reducing MOSFET VDS stress and eliminating need for snubber RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Lower PPPM (400 W), SMA package, 200 °C max soldering temp only | Not suitable for 3600 W load dump; limited to low-energy transients in non-automotive systems | Select only if system energy is <500 W and space constraints prohibit DO-218 footprint. |
| SMCJ11A | Same DO-214AB package, 1500 W PPPM, higher VC = 19.0 V at 113 A | Lacks AEC-Q101 qualification and ISO16750-2 validation; not approved for production automotive use | Acceptable for prototyping or industrial backup systems where automotive certification is not required. |
Compared with SMAJ11A and SMCJ11A, ALS5W11A uniquely combines AEC-Q101 qualification, 3600 W pulse rating, and DO-218 thermal performance - making it the only option qualified for volume production in engine bay–located automotive modules requiring sustained high-power transient suppression.
Availability
ALS5W11A is available at Aetrix Electronics and suitable for automotive ECU protection, LED headlamp driver design, body control module (BCM) development, and start-stop system relay driver implementation requiring stable component supply across multi-year vehicle programs.
Supply support for ALS5W11A 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 and manufacturing operations across Asia and the Americas.
The ALS5WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for high-energy load dump suppression in 12 V vehicle electrical systems - emphasizing thermal robustness, AEC-Q101 reliability, and ISO-compliant surge immunity.
FAQ
What is the polarity configuration of ALS5W11A and how must it be mounted?
The ALS5W11A is unidirectional with the heatsink serving as the anode terminal and the cathode marked by a bar on the top surface. It must be mounted with the heatsink soldered directly to a large copper thermal pad on the PCB, and the cathode connected to the protected circuit's ground reference. Incorrect polarity will prevent clamping during positive transients.
Does ALS5W11A meet ISO7637-2 Pulse 5a and 5b requirements?
Yes - ALS5W11A is explicitly validated per ISO7637-2 for load dump testing, including Pulse 5a (12 V system, 100 V/100 ms) and Pulse 5b (24 V system, 170 V/100 ms), as confirmed in Diodes' application note AN-103 and datasheet Rev-4 test reports. Its 3600 W rating covers worst-case energy levels defined in these pulses.
Can ALS5W11A be used in parallel to increase surge current handling?
No - paralleling ALS5W11A devices is not recommended due to mismatch in VBR (12.2–13.5 V) causing uneven current sharing. Diodes does not characterize or guarantee performance in parallel configurations. For higher current needs, select a higher-rated variant (e.g., ALS5W15A) or consult Diodes' application engineering for layout-optimized single-device solutions.
What is the maximum allowable soldering temperature and duration for ALS5W11A?
ALS5W11A supports lead-free reflow soldering at a peak temperature of 260 °C for up to 10 seconds, per J-STD-020 MSL Level 1 classification. The DO-218 package is qualified for this profile with no degradation to clamping performance or thermal resistance when proper PCB pad design (≥200 mm² copper) is implemented.
ALS5W11A 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):
- 198A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
ALS5W11A FAQ
1.How can I place an order for ALS5W11A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W11A 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 ALS5W11A reliable?
The price and inventory of ALS5W11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W11A is usually 5 days.
3.What payment methods are accepted for ALS5W11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W11A?
ALS5W11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W11A 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 ALS5W11A?
For technical support, including ALS5W11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W11A requirements.
6.How does Aetrix verify that ALS5W11A is sourced from the original manufacturer or authorized distributors?
All ALS5W11A 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 ALS5W11A meets industry standards.
7.What is the process for return or replacement of ALS5W11A?
All ALS5W11A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W11A, 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 ALS5W11A part is unused and in its original packaging.
Return procedure for ALS5W11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W11A Tags
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