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Diodes Incorporated ALS6W17A
- Part No.:
- ALS6W17A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W17A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,302
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Product details
Overview
ALS6W17A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 17.0 V standoff voltage, 18.9–20.9 V breakdown voltage at 5 mA, 4600 W peak pulse power (10/1000 µs), and 600 A forward surge current. It serves as a clamping diode for automotive ECU modules to protect sensitive electronics against ISO 7637-2 and ISO 16750-2 load dump transients.
For engineers reviewing the ALS6W17A datasheet, ALS6W17A pinout, ALS6W17A application, or ALS6W17A equivalent, key selection criteria include its 27.6 V clamping voltage at 167 A, 10 µA max reverse leakage at VWM, AEC-Q101 qualification, MSL Level 1 rating, and DO-218 thermal performance up to +175 °C junction temperature.
Technical Context
This device operates as a unidirectional TVS diode optimized for high-energy automotive load dump suppression. Its silicon construction delivers low forward voltage drop (≤1.9 V at 100 A), low thermal resistance, and stable clamping behavior across −55 °C to +175 °C operating range.
The DO-218 package enables direct heatsink mounting via anode-side thermal path, supporting high-power dissipation with 260 °C soldering tolerance and UL94-V0 molding compound. Polarity is defined with heatsink as anode, critical for correct PCB layout and thermal management in 12 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 18.9 V / 20.9 V - Breakdown occurs within this range at 5 mA test current, defining turn-on threshold |
| VC @ IPPM | 27.6 V - Clamping voltage at 167 A peak pulse current, limiting downstream voltage stress |
| PPPM (10/1000 µs) | 4600 W - Peak transient power handling capability under standard load dump waveform |
| IFSM | 600 A - Surge current rating for 8.3 ms half-sine wave, supporting high-energy inductive kick events |
| TJ Range | −55 °C to +175 °C - Full automotive-grade junction temperature operation without derating loss |
| Leakage @ VWM | 10 µA - Low reverse leakage ensures minimal standby power loss in always-on vehicle modules |
Pinout & Package
DO-218 plastic package with anode-connected heatsink base and cathode marked by bar on top surface. Terminals are matte tin-plated for solderability per MIL-STD-750 Method 2026 and J-STD-002. Polarity: heatsink = anode; top marking side = cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Base) | Power Input / Thermal Path | Primary conduction path during clamping; serves as mechanical and thermal interface to PCB copper pour or external heatsink |
| Cathode (Top Surface Bar) | Clamped Output / Reference Node | Connected to protected circuit rail; defines clamping reference point and polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified and PPAP capable - meets production release requirements for Tier 1 automotive suppliers |
| Thermal robustness | Rated for +175 °C junction operation with MSL Level 1 moisture sensitivity - supports under-hood deployment without derating |
| Surge endurance | 600 A IFSM and 4600 W PPPM - withstands repeated load dump events in 12 V battery systems |
| Low-loss conduction | ≤1.9 V forward voltage at 100 A - minimizes power dissipation during sustained overvoltage conditions |
| Environmental compliance | RoHS 3 compliant, halogen- and antimony-free "Green" construction - satisfies global automotive material restrictions |
Applications
| Engine Control Unit Protection | Body Control Module Protection |
|---|---|
Use Scenario: Protects microcontroller power rails and CAN transceivers in engine ECUs exposed to alternator load dump surges during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery input and protected DC/DC converter input. Use Value: Limits transient voltage to ≤27.6 V at 167 A, preventing latch-up or damage to 3.3 V/5 V logic and communication ICs. | Use Scenario: Shields lighting drivers and window motor controllers in BCMs from load dump spikes generated by high-current solenoid switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V main supply rail upstream of local regulators and gate drivers. Use Value: Sustains 600 A surge current without failure, enabling reliable operation in multi-load automotive domains. |
| ADAS Camera Power Supply | Infotainment Head Unit Input |
Use Scenario: Safeguards image sensor power conditioning circuits in rear-view or surround-view cameras mounted near engine compartments. IC Role / Device Role / Timing Role: Front-end TVS on fused 12 V input, directly coupled to input capacitor bank. Use Value: Maintains <10 µA leakage at 17 V, avoiding quiescent current impact on always-on camera wake-up functionality. | Use Scenario: Guards USB-C PD controller and audio amplifier supplies in head units subjected to ignition cycling and accessory load transients. IC Role / Device Role / Timing Role: Bulk transient suppressor on main 12 V distribution node feeding multiple LDOs and buck converters. Use Value: Delivers 4600 W peak power handling with DO-218 thermal path, reducing need for secondary clamping stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Lower PPPM (400 W), SMA package, 23.5 V clamping at 17.1 A | Not suitable for full ISO 7637-2 load dump; limited to lower-energy transients | Select only for non-critical 12 V subsystems with <500 W surge exposure |
| SMCJ17A | Higher PPPM (1500 W), SMC package, 27.6 V clamping at 54.3 A | Lacks AEC-Q101 qualification and 175 °C rating; not approved for under-hood use | Acceptable for cabin-mounted modules where ambient temperature stays below 105 °C |
Compared with SMAJ17A and SMCJ17A, ALS6W17A uniquely combines 4600 W surge capacity, AEC-Q101 qualification, and DO-218 thermal design-making it the only option rated for direct integration into engine bay ECUs meeting ISO 7637-2 Pulse 5a/b requirements.
Availability
ALS6W17A is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and infotainment head unit inputs requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for ALS6W17A 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 ALS6WxxA series is part of Diodes' automotive-grade TVS portfolio, engineered specifically for load dump protection in 12 V vehicle electrical systems with emphasis on thermal resilience, surge endurance, and regulatory compliance.
FAQ
What is the maximum clamping voltage of ALS6W17A under load dump conditions?
The maximum clamping voltage VC is 27.6 V when subjected to its rated peak pulse current of 167 A (10/1000 µs waveform). This value is measured at TA = 25 °C and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events.
Can ALS6W17A be used in 24 V commercial vehicle systems?
No - ALS6W17A is specified for 17.0 V standoff and optimized for 12 V automotive battery systems. For 24 V applications, Diodes offers ALS6W30A (30 V VWM) and ALS6W33A (33 V VWM) variants with matching DO-218 packaging and AEC-Q101 qualification.
Is heatsinking required for ALS6W17A in continuous operation?
Heatsinking is not required for transient suppression, but the DO-218 anode base is designed for thermal coupling to PCB copper or external heatsinks. Under repeated surge conditions or elevated ambient temperatures (>105 °C), thermal relief via heatsink improves long-term reliability and prevents junction overheating.
Does ALS6W17A meet ISO 7637-2 Pulse 5a and 5b test requirements?
Yes - ALS6W17A is explicitly validated to meet both ISO 7637-2 Pulse 5a (12 V system, 100 V/100 ms) and Pulse 5b (12 V system, 120 V/200 ms) load dump waveforms when properly mounted with adequate PCB copper area, as confirmed in Diodes' application documentation and AEC-Q101 test reports.
ALS6W17A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 167A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
ALS6W17A FAQ
1.How can I place an order for ALS6W17A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W17A 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 ALS6W17A reliable?
The price and inventory of ALS6W17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W17A is usually 5 days.
3.What payment methods are accepted for ALS6W17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W17A?
ALS6W17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W17A 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 ALS6W17A?
For technical support, including ALS6W17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W17A requirements.
6.How does Aetrix verify that ALS6W17A is sourced from the original manufacturer or authorized distributors?
All ALS6W17A 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 ALS6W17A meets industry standards.
7.What is the process for return or replacement of ALS6W17A?
All ALS6W17A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W17A, 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 ALS6W17A part is unused and in its original packaging.
Return procedure for ALS6W17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W17A Tags
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