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Diodes Incorporated ALS5W15A
- Part No.:
- ALS5W15A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W15A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,014
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Product details
Overview
ALS5W15A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 15 V standoff voltage (VWM), 16.7–18.5 V breakdown (VBR), 3600 W peak pulse power (10/1000 µs), and 500 A surge current (IFSM). It serves as a clamping diode for automotive ECU modules to protect sensitive electronics against ISO 7637-2 load dump transients.
For engineers reviewing the ALS5W15A datasheet, ALS5W15A pinout, ALS5W15A application, or ALS5W15A equivalent, key selection criteria include its 24.4 V clamping voltage at 148 A, AEC-Q101 qualification, 175 °C junction temperature rating, and DO-218 mechanical compatibility with high-power automotive PCB layouts.
Technical Context
This device operates as a unidirectional TVS diode optimized for automotive load dump protection, where it clamps induced voltage spikes by entering avalanche conduction above its 16.7–18.5 V breakdown threshold. Its low thermal resistance and high-temperature stability enable reliable operation up to +175 °C junction temperature.
The DO-218 package features a heatsink-connected anode terminal, enabling efficient heat dissipation during 3600 W transient events. It meets ISO 16750-2 test conditions for load dump immunity and supports lead-free reflow up to 260 °C per J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.0 V - Maximum reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V automotive systems. |
| VBR (min/max) | 16.7 V / 18.5 V - Measured at 5 mA; ensures consistent avalanche initiation across production lots and temperature range. |
| VC @ IPPM | 24.4 V @ 148 A - Clamping voltage under 10/1000 µs surge; limits downstream IC stress below 25 V during worst-case load dump. |
| PPPM (10/1000 µs) | 3600 W - Peak transient power handling capability; sustains ISO 7637-2 Pulse 5a without failure. |
| IFSM | 500 A - 8.3 ms half-sine surge current rating; validates robustness against repetitive inductive switching events. |
| TJ Range | −55 °C to +175 °C - Full automotive temperature operation; enables placement near hot ECU power stages. |
Pinout & Package
DO-218 plastic package with heatsink-connected anode terminal and cathode marked by bar. Anode serves as thermal and electrical reference point; cathode connects to protected circuit rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Power input / Thermal path | Electrically tied to PCB copper pour for thermal management; must be connected to system ground or chassis return path. |
| Cathode (Bar-marked) | Clamped output / Protected rail | Connected to sensitive 12 V supply rail; conducts surge current to anode when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables precise forward-biased protection of 12 V rails without reverse leakage interference during normal operation. |
| AEC-Q101 qualification | Validates reliability for automotive under-hood applications including engine control, lighting, and ADAS modules. |
| Low VF (≤2.0 V @ 100 A) | Minimizes conduction loss and self-heating during high-current surges, preserving clamping accuracy over time. |
| MSL Level 1 rating | Supports standard SMT reflow without moisture-induced popcorn failure; eliminates pre-bake requirement. |
| Halogen- and antimony-free | Meets automotive "Green" material requirements (<900 ppm Br/Cl, <1000 ppm Sb); compliant with EU RoHS 3. |
Applications
| Engine Control Unit (ECU) Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller power rails and CAN transceivers in gasoline/diesel engine ECUs exposed to alternator load dump events. IC Role / Device Role / Timing Role: Clamping diode placed between battery feed and local 12 V regulator input. Use Value: Limits transient voltage to ≤24.4 V, preventing latch-up or damage to 28 V-rated LDOs and MCU I/Os. | Use Scenario: Shields constant-current LED driver ICs and MOSFET gate drivers in adaptive front-lighting systems. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on main 12 V input bus upstream of buck controller. Use Value: Absorbs 3600 W pulses without derating, maintaining LED illumination continuity during ignition cycling. |
| Body Control Module (BCM) Power Input | Start-Stop System Battery Interface |
Use Scenario: Secures power management ICs and LIN transceivers in door modules and seat controllers subjected to vehicle-wide load dump propagation. IC Role / Device Role / Timing Role: Primary transient suppression element at BCM main power entry point. Use Value: Withstands repeated 10/1000 µs surges while maintaining <10 µA leakage at 15 V, ensuring low standby current. | Use Scenario: Guards bidirectional DC-DC converters and supercapacitor charging circuits in 12 V start-stop architectures. IC Role / Device Role / Timing Role: Bidirectional protection anchor at battery terminal interface with active energy recovery path. Use Value: Operates reliably at 175 °C ambient, enabling direct mounting on battery junction boxes without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Lower PPPM (400 W), SMA package, 23.2 V clamping at 17.3 A | Not suitable for ISO 7637-2 Pulse 5a; limited to low-energy transients | Select only for non-automotive 12 V systems with <500 W surge exposure. |
| SMCJ15A | Higher PPPM (1500 W), SMC package, 24.4 V clamping at 61.5 A | Lacks AEC-Q101 qualification and 175 °C rating; not validated for under-hood use | Acceptable for industrial control panels but not for automotive OEM designs requiring PPAP. |
Compared with SMAJ15A and SMCJ15A, ALS5W15A delivers 2.4× higher surge current capacity (148 A vs. 61.5 A), full automotive qualification, and DO-218 thermal performance essential for sustained load dump immunity in modern ECUs.
Availability
ALS5W15A is available at Aetrix Electronics and suitable for automotive engine control units, LED lighting systems, body control modules, and start-stop battery interfaces requiring stable component supply and long-term lifecycle support.
Supply support for ALS5W15A 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 ALS5WxxA series is part of Diodes' automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 load dump compliance in harsh under-hood environments.
FAQ
What is the maximum clamping voltage of ALS5W15A under a 10/1000 µs surge?
The maximum clamping voltage (VC) is 24.4 V when subjected to a peak pulse current (IPPM) of 148 A under the 10/1000 µs waveform. This value is measured at TA = 25 °C and guarantees that protected circuitry remains below critical 25 V thresholds during standardized load dump testing.
Is ALS5W15A suitable for bidirectional transient suppression?
No - ALS5W15A is a unidirectional TVS diode, designed to clamp positive transients only on a DC rail referenced to ground. It does not suppress negative-going surges or AC signals. For bidirectional protection, a separate design using back-to-back devices or a dedicated bidirectional TVS is required.
How does the DO-218 package improve thermal performance over SMA or SMC packages?
The DO-218 package integrates a large metal heatsink directly connected to the anode, reducing thermal resistance from junction to case (RθJC) and enabling continuous power dissipation up to 3600 W. Its footprint allows direct copper pour attachment, achieving >30% lower steady-state temperature rise than SMCJ equivalents at identical surge duty cycles.
Does ALS5W15A require external current-limiting components in series?
No - ALS5W15A is designed for direct parallel connection across protected rails without series impedance. Its low dynamic impedance and controlled avalanche behavior ensure self-limiting conduction during transients. Series resistors or fuses would degrade clamping response and are unnecessary unless mandated by system-level fault isolation requirements.
ALS5W15A 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):
- 148A
- 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
ALS5W15A FAQ
1.How can I place an order for ALS5W15A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W15A 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 ALS5W15A reliable?
The price and inventory of ALS5W15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W15A is usually 5 days.
3.What payment methods are accepted for ALS5W15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W15A?
ALS5W15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W15A 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 ALS5W15A?
For technical support, including ALS5W15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W15A requirements.
6.How does Aetrix verify that ALS5W15A is sourced from the original manufacturer or authorized distributors?
All ALS5W15A 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 ALS5W15A meets industry standards.
7.What is the process for return or replacement of ALS5W15A?
All ALS5W15A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W15A, 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 ALS5W15A part is unused and in its original packaging.
Return procedure for ALS5W15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W15A Tags
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