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Diodes Incorporated ALS8W15A
- Part No.:
- ALS8W15A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W15A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,136
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Product details
Overview
ALS8W15A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 15 V stand-off voltage (VWM), 16.7–18.5 V breakdown (VBR), 6600 W peak pulse power (10/1000 μs), and 270 A peak pulse current, designed for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W15A datasheet, ALS8W15A pinout, ALS8W15A application, or ALS8W15A equivalent, key selection criteria include clamping voltage (24.4 V at 270 A), low thermal resistance, AEC-Q101 qualification readiness, +175°C junction rating, and DO-218 mechanical compatibility with high-power automotive PCB layouts.
Technical Context
The ALS8W15A operates as a unidirectional avalanche diode optimized for high-energy transient suppression in 12 V automotive systems. It delivers 6600 W peak pulse power under 10/1000 μs waveform and maintains stable clamping at 24.4 V up to 270 A, with <10 μA reverse leakage at 15 V and 25°C.
Its DO-218 package features an anode-heatsink configuration, enabling direct thermal coupling to heatsinks or copper planes. The device sustains operation from –55°C to +175°C and meets ISO 16750-2 surge requirements when tested per specified load dump profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.0 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (min/max) | 16.7 V / 18.5 V - Breakdown voltage range at 5 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 24.4 V - Clamping voltage at 270 A peak pulse; determines maximum protected circuit stress during load dump |
| PPPM (10/1000μs) | 6600 W - Peak transient energy absorption capability; enables single-device protection of 12 V ECUs |
| IFSM | 700 A - Non-repetitive forward surge rating; supports high-current inrush during system startup or fault recovery |
| TJ Range | –55°C to +175°C - Extended junction temperature range ensures reliability in under-hood environments |
| Polarity | Unidirectional - Anode-connected heatsink configuration simplifies thermal design and PCB layout |
Pinout & Package
Package: DO-218 plastic outline with anode-heatsink polarity; molded "Green" compound (UL 94V-0), matte tin-plated terminals, moisture sensitivity level 1, weight ≈2.74 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Current input / Thermal path | Electrically connected to metal tab; must be soldered to large copper area or external heatsink for thermal management |
| Cathode (Bar-marked lead) | Current output / Transient sink | Connected to protected circuit ground; clamps positive transients by conducting to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| High peak pulse power | 6600 W (10/1000 μs) enables single-diode protection of 12 V automotive modules without parallel staging |
| Low clamping voltage | 24.4 V at 270 A limits downstream IC stress below typical 28 V automotive rail derating thresholds |
| Automotive-grade thermal stability | Operates continuously up to +175°C junction temperature; validated for under-hood ECU placement |
| ISO 7637-2 compliance | Qualified per load dump test conditions (Pulse 5a); eliminates need for additional TVS staging in standard ECU designs |
| Lead-free & halogen-free | RoHS 3 compliant with <900 ppm Br/Cl and <1000 ppm Sb; supports global automotive environmental mandates |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protects 12 V microcontroller power rails in gasoline/diesel engine ECUs exposed to alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between battery feed and LDO/regulator input. Use Value: Clamps transients to 24.4 V, preventing overvoltage damage to 28 V-rated power management ICs and MCU I/Os. | Use Scenario: Shields BCM power inputs during vehicle jump-start or battery replacement with reverse polarity risk. IC Role / Device Role / Timing Role: Primary load dump clamp on main 12 V supply line upstream of DC-DC converters. Use Value: Absorbs 6600 W surges without degradation, maintaining system uptime during real-world service events. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Module |
Use Scenario: Secures 12 V input to image sensor SoCs and ISP processors in front/rear-view cameras. IC Role / Device Role / Timing Role: Fast-response clamping diode placed adjacent to connector entry point. Use Value: Sub-100 ns response time and low dynamic impedance limit voltage overshoot to safe levels for sensitive CMOS image sensors. | Use Scenario: Guards motor driver power stage and MCU supply in EPS control units subjected to aggressive load dump cycles. IC Role / Device Role / Timing Role: High-current transient suppressor mounted directly on heatsink near H-bridge FETs. Use Value: 700 A IFSM rating supports repeated surge events during steering assist activation without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Lower PPPM (400 W), DO-214AC package, 24.4 V VC at 16.7 A (not 270 A) | Not suitable for full ISO 7637-2 Pulse 5a; limited to low-energy transients | Select only for non-automotive or low-risk 12 V subsystems where peak current <20 A |
| SMCJ15A | Higher PPPM (1500 W), DO-214AB package, 24.4 V VC at 61.5 A | Insufficient for 6600 W load dump; requires parallel devices for equivalent energy handling | Use only if board space allows multiple devices and thermal design accommodates stacked dissipation |
Compared with SMAJ15A and SMCJ15A, ALS8W15A delivers 4.4× and 2.2× higher peak pulse power respectively in a thermally superior DO-218 package, enabling single-device compliance with automotive load dump standards without layout compromise.
Availability
ALS8W15A is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across long production lifecycles.
Supply support for ALS8W15A 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The ALS8W series belongs to Diodes' automotive-grade transient voltage suppressor product line, engineered specifically for ISO 7637-2 and ISO 16750-2 load dump protection in 12 V vehicle electrical architectures.
FAQ
What is the maximum clamping voltage of ALS8W15A under full-rated surge current?
The ALS8W15A clamps to 24.4 V at its rated peak pulse current of 270 A under the 10/1000 μs waveform. This value is measured and guaranteed per DS43856 Rev. 9, ensuring predictable overvoltage limiting for downstream 28 V-rated ICs in automotive power rails.
Is ALS8W15A qualified to AEC-Q101?
ALS8W15A is designed and tested to meet AEC-Q101 requirements for discrete semiconductors. While final qualification status depends on specific lot testing and PPAP submission, Diodes confirms this device family is manufactured in IATF 16949-certified facilities and supports automotive change control protocols.
Can ALS8W15A be used in 24 V systems?
No - ALS8W15A is specified for 12 V nominal systems with 15 V stand-off voltage. For 24 V applications, Diodes offers ALS8W26A (26 V VWM) and ALS8W30A (30 V VWM) variants in the same DO-218 package, maintaining identical thermal and surge performance.
How is thermal management implemented for ALS8W15A in high-power automotive layouts?
The DO-218 package uses the anode as an integrated heatsink tab. Effective thermal management requires soldering the tab to ≥250 mm² of 2 oz copper with ≥4 thermal vias to inner ground planes. Diodes specifies +260°C soldering tolerance and validates thermal impedance down to 0.3°C/W under optimized mounting conditions.
ALS8W15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 270A
- 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
ALS8W15A FAQ
1.How can I place an order for ALS8W15A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W15A 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 ALS8W15A reliable?
The price and inventory of ALS8W15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W15A is usually 5 days.
3.What payment methods are accepted for ALS8W15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W15A?
ALS8W15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W15A 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 ALS8W15A?
For technical support, including ALS8W15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W15A requirements.
6.How does Aetrix verify that ALS8W15A is sourced from the original manufacturer or authorized distributors?
All ALS8W15A 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 ALS8W15A meets industry standards.
7.What is the process for return or replacement of ALS8W15A?
All ALS8W15A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W15A, 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 ALS8W15A part is unused and in its original packaging.
Return procedure for ALS8W15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W15A Tags
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