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Diodes Incorporated ALS5W14A
- Part No.:
- ALS5W14A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W14A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,257
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Product details
Overview
ALS5W14A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 14.0 V standoff voltage, 15.6–17.2 V breakdown, 23.2 V clamping at 155 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It serves as a clamping diode for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS5W14A datasheet, ALS5W14A pinout, ALS5W14A application, or ALS5W14A equivalent, key selection criteria include clamping voltage at rated IPPM, thermal resistance under high-temperature operation (−55 °C to +175 °C), compliance with AEC-Q101, and DO-218 mechanical compatibility in high-power automotive PCB layouts.
Technical Context
This device operates as a unidirectional TVS diode optimized for automotive load dump suppression, leveraging silicon avalanche structure to clamp transients above VWM while maintaining low forward voltage (<2.0 V at 100 A) and low reverse leakage (<10 µA at 14.0 V, 25 °C).
Its thermal design supports sustained operation up to +175 °C junction temperature, with low thermal resistance enabled by the DO-218 package's heatsink-anode construction and 2.74 g mass, delivering stable clamping performance across wide ambient and case temperature ranges per Fig.1 and Fig.2 derating curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14.0 V - Maximum continuous reverse operating voltage before significant leakage begins; defines system bus voltage compatibility. |
| VBR (min/max) | 15.6 V / 17.2 V - Breakdown occurs within this range at 5.0 mA test current; ensures reliable turn-on during surge onset. |
| VC @ IPPM | 23.2 V - Clamping voltage at 155 A peak pulse (10/1000 µs); limits downstream IC stress during load dump events. |
| PPPM (10/1000 µs) | 3600 W - Peak transient power handling capability; meets ISO 7637-2 Pulse 5a requirements for 12 V systems. |
| IFSM | 500 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports high-energy inrush and fault currents. |
| TJ Range | −55 °C to +175 °C - Extended junction temperature range enables under-hood deployment without derating loss. |
Pinout & Package
Package: DO-218 outline plastic case with heatsink-anode polarity; matte tin-plated terminals; UL94-V0 molding compound; 2.74 g mass; 750 pcs/reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry point during clamping | Integrated metal heatsink serves as electrical anode terminal; requires direct PCB copper pour for thermal and current path integrity. |
| Cathode (Bar-marked lead) | Current exit point during clamping | Marked terminal connects to protected circuit ground or low-side return; defines unidirectional conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive under-hood use including temperature cycling, HTRB, and surge endurance. |
| ISO 7637-2 & ISO 16750-2 compliance | Tested to meet Pulse 5a load dump waveform requirements across full temperature range. |
| Low thermal resistance | DO-218 heatsink-anode construction enables efficient heat dissipation at 175 °C junction. |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); <900 ppm Br/Cl, <1000 ppm Sb; satisfies automotive environmental mandates. |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller, CAN transceiver, and sensor interface circuits in engine bay ECUs exposed to 12 V battery load dump surges. IC Role / Device Role / Timing Role: Clamping diode placed between battery rail and protected subsystem input, conducting only during overvoltage events. Use Value: Limits transient voltage to ≤23.2 V at 155 A, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and analog front-ends. | Use Scenario: Shields constant-current LED driver ICs and MOSFET switches in adaptive headlamps from alternator-induced load dump spikes. IC Role / Device Role / Timing Role: Unidirectional shunt element connected across input capacitor of DC/DC buck controller. Use Value: Absorbs 3600 W peak energy without degradation, preserving LED driver functionality and enabling ASIL-B system compliance. |
| Body Control Module Input Protection | Start-Stop System Power Rail Protection |
Use Scenario: Safeguards LIN transceivers, power management ICs, and relay drivers in BCMs subjected to repeated cold-crank and load dump events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V main supply rail upstream of LDOs and PMICs. Use Value: Maintains <10 µA leakage at 14.0 V and 175 °C, ensuring low quiescent current in always-on vehicle domains. | Use Scenario: Protects bidirectional DC/DC converters and supercapacitor charge controllers in 12 V start-stop systems experiencing frequent battery disconnect/reconnect transients. IC Role / Device Role / Timing Role: High-energy transient absorber placed at battery input node of dual-battery architecture. Use Value: Withstands 500 A non-repetitive forward surge, enabling robust operation during cranking-induced voltage collapse and recovery overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Lower PPPM (400 W), SMA package, 200 A IPPM, higher VC (23.2 V → 25.5 V) | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients in non-automotive or auxiliary circuits. | Select only if system surge energy is ≤400 W and space constraints prohibit DO-218 footprint. |
| SMCJ14A | Higher PPPM (1500 W), SMC package, 123 A IPPM, same VC (23.2 V), lower IFSM (200 A) | Meets ISO 7637-2 Pulse 5b but not 5a; insufficient for full automotive load dump in 12 V systems. | Use where cost sensitivity outweighs full AEC-Q101 compliance and 3600 W requirement. |
Compared with SMAJ14A and SMCJ14A, ALS5W14A delivers 2.4× and 2.4× higher peak pulse power respectively, with verified AEC-Q101 qualification and DO-218 thermal performance essential for under-hood automotive deployment.
Availability
ALS5W14A is available at Aetrix Electronics and suitable for engine control units, LED headlamp drivers, body control modules, and start-stop system power rails requiring stable component supply across automotive production lifecycles.
Supply support for ALS5W14A 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 belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 load dump protection in 12 V vehicle electrical systems with extended temperature and surge endurance requirements.
FAQ
What is the maximum clamping voltage of ALS5W14A under full-rated surge current?
The maximum clamping voltage (VC) is 23.2 V at 155 A peak pulse current (10/1000 µs waveform), measured per JEDEC standards at TA = 25 °C. This value remains stable across −55 °C to +175 °C due to low thermal resistance and high-temperature stability design.
Is ALS5W14A compatible with lead-free reflow processes?
Yes - ALS5W14A is qualified for lead-free soldering at 260 °C for 10 seconds per J-STD-020, with matte tin-plated terminals meeting MIL-STD-750 Method 2026 and JESD22-B102 requirements. Its DO-218 package withstands high-temperature assembly without delamination or parameter shift.
How does ALS5W14A differ from standard TVS diodes like SMAJ14A?
ALS5W14A delivers 3600 W peak pulse power (vs. 400 W for SMAJ14A), uses DO-218 package with heatsink-anode for superior thermal management, and is AEC-Q101 qualified with ISO 7637-2 Pulse 5a validation - making it suitable for primary automotive load dump protection where SMAJ14A is limited to secondary or non-automotive use.
What is the polarity configuration and PCB layout requirement for ALS5W14A?
ALS5W14A is unidirectional with anode connected to the heatsink (case) and cathode marked by a bar. The heatsink must be soldered to a large copper pour acting as both thermal sink and anode connection; minimum 200 mm² 2 oz copper recommended for 175 °C operation per Diodes' application guidance.
ALS5W14A 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 155A
- 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
ALS5W14A FAQ
1.How can I place an order for ALS5W14A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W14A 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 ALS5W14A reliable?
The price and inventory of ALS5W14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W14A is usually 5 days.
3.What payment methods are accepted for ALS5W14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W14A?
ALS5W14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W14A 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 ALS5W14A?
For technical support, including ALS5W14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W14A requirements.
6.How does Aetrix verify that ALS5W14A is sourced from the original manufacturer or authorized distributors?
All ALS5W14A 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 ALS5W14A meets industry standards.
7.What is the process for return or replacement of ALS5W14A?
All ALS5W14A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W14A, 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 ALS5W14A part is unused and in its original packaging.
Return procedure for ALS5W14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W14A Tags
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