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Diodes Incorporated ALS6W43A
- Part No.:
- ALS6W43A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W43A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,382
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Product details
Overview
ALS6W43A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 43 V standoff voltage, 52.8 V breakdown voltage, 4600 W peak pulse power (10/1000 µs), and 600 A surge current. It serves as a clamping diode for automotive ECU modules to protect sensitive electronics against ISO7637-2/ISO16750-2 load dump transients.
For engineers reviewing the ALS6W43A datasheet, ALS6W43A pinout, ALS6W43A application, or ALS6W43A equivalent, key selection criteria include clamping voltage (69.4 V at 66 A), thermal stability up to +175 °C junction temperature, AEC-Q101 qualification, and DO-218 mechanical compatibility with high-temperature soldering (260 °C/10 s).
Technical Context
This device operates as a unidirectional avalanche diode optimized for automotive load dump suppression. Its 43 V reverse standoff voltage and 52.8 V minimum breakdown voltage ensure reliable triggering during 12 V system overvoltage events, while the 69.4 V clamping voltage at 66 A limits downstream voltage stress under standardized 10/1000 µs surge conditions.
Thermal design is enabled by low thermal resistance and DO-218 package construction with heatsink-connected anode polarity. It sustains operation across –55 °C to +175 °C junction temperature range and meets MSL Level 1 per J-STD-020, supporting lead-free reflow without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min) | 47.8 V - Minimum breakdown voltage at 5 mA test current, defining turn-on threshold |
| VC @ IPPM | 69.4 V - Clamping voltage at 66 A peak pulse current, limiting protected circuit voltage |
| PPPM (10/1000 µs) | 4600 W - Peak surge power handling capability under standard load dump waveform |
| IFSM | 600 A - Maximum non-repetitive forward surge current (8.3 ms half-sine), critical for inductive switch-off energy absorption |
| TJ Range | –55 °C to +175 °C - Operating junction temperature range enabling under-hood automotive deployment |
| Leakage @ VWM | 10 µA max at 25 °C - Low reverse leakage preserves system efficiency and minimizes standby power loss |
Pinout & Package
ALS6W43A uses the DO-218 surface-mount plastic package with heatsink-connected anode polarity. The case serves as the anode terminal; the cathode is marked by a bar on the body. No separate signal pins-only two terminals: anode (case/heatsink) and cathode (lead).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Case/Heatsink) | Power input / Surge return path | Electrically connected to PCB copper pour for thermal dissipation and low-inductance surge current return |
| Cathode (Lead) | Clamped output / Protected rail connection | Connected to the 12 V supply rail upstream of protected ICs; conducts surge current to ground/anode when VWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per stress test requirements |
| ISO7637-2 & ISO16750-2 compliant | Guaranteed performance against Pulse 5a/b load dump waveforms up to specified energy levels |
| DO-218 package with heatsink anode | Enables direct thermal coupling to PCB copper, reducing junction-to-board thermal resistance for sustained surge handling |
| Low 1.9 V forward voltage @ 100 A | Minimizes conduction loss and self-heating during high-current surge events |
| Halogen- and antimony-free "Green" construction | Meets automotive environmental mandates with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb compounds |
Applications
| Automotive Engine Control Unit (ECU) Protection | Commercial Vehicle Lighting Control Module |
|---|---|
Use Scenario: Protecting microcontroller power rails during alternator load dump events in gasoline/diesel engine compartments. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery feed and protected 12 V rail, conducting only during overvoltage transients. Use Value: Limits rail voltage to ≤69.4 V during 4600 W surges, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies downstream. | Use Scenario: Safeguarding LED driver ICs and CAN transceivers in heavy-duty truck headlight control units exposed to frequent switching transients. IC Role / Device Role / Timing Role: Primary transient suppressor on main 24 V supply line, activated within nanoseconds of voltage rise exceeding 43 V. Use Value: Withstands 600 A surge current and maintains stable clamping up to +175 °C ambient, ensuring reliability in sealed, high-temperature enclosures. |
| Off-Highway Equipment Battery Management | Hybrid Powertrain DC-DC Converter Input Stage |
Use Scenario: Shielding BMS monitoring circuits from load dump spikes generated by solenoid actuation in agricultural machinery. IC Role / Device Role / Timing Role: Standoff-rated TVS diode placed at converter input, absorbing energy from inductive kickback before it reaches regulation stage. Use Value: 43 V VWM avoids false triggering during normal 28.5 V float charging, while 4600 W rating handles worst-case 10 ms exponential surges. | Use Scenario: Protecting high-efficiency SiC-based DC-DC controllers in 48 V mild-hybrid systems during cold-crank and load dump events. IC Role / Device Role / Timing Role: Fast-response clamping element on primary-side input, coordinated with upstream fusing to limit fault energy. Use Value: Low thermal resistance and MSL Level 1 rating support automated SMT assembly and long-term reliability in thermally cycled hybrid power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | DO-214AC package, 43 V VWM, 69.4 V VC, but only 400 W PPPM | Limited to lower-energy transients; unsuitable for full ISO7637-2 Pulse 5 compliance | Select when space-constrained layouts require smaller footprint and surge energy is below 1 kJ |
| SMCJ43A | DO-214AB package, same 43 V VWM, 69.4 V VC, but 1500 W PPPM | Insufficient for automotive load dump; rated for lower-energy ISO16750-2 Pulse 1/2 only | Choose for cost-sensitive industrial controls where full automotive surge immunity is not required |
Compared with SMAJ43A and SMCJ43A, ALS6W43A delivers 3× higher peak power (4600 W) and AEC-Q101 qualification, making it the only option validated for under-hood automotive load dump protection where thermal robustness and standardized compliance are mandatory.
Availability
ALS6W43A is available at Aetrix Electronics and suitable for automotive ECU protection, commercial vehicle lighting modules, off-highway equipment BMS, and hybrid powertrain DC-DC converters requiring stable component supply and full ISO7637-2 compliance.
Supply support for ALS6W43A 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 suppression in 12 V and 24 V vehicle electrical systems with emphasis on thermal survivability and standardized surge compliance.
FAQ
What is the maximum clamping voltage of ALS6W43A and under what test condition is it specified?
The maximum clamping voltage is 69.4 V, measured at 66 A peak pulse current using the 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during standardized load dump events.
How does the DO-218 package improve thermal performance compared to DO-214AB or DO-214AC?
The DO-218 package features a large metalized case that functions as the anode and provides direct thermal conduction to the PCB copper pour. Its thermal resistance is significantly lower than DO-214AB/AC, enabling sustained power dissipation and higher surge current handling without thermal runaway-critical for automotive under-hood environments where ambient temperatures exceed 125 °C.
Is ALS6W43A suitable for 24 V commercial vehicle systems?
Yes-its 43 V standoff voltage and 69.4 V clamping voltage provide appropriate margin above nominal 24 V system voltages (28.5 V float charge), while its 4600 W peak power rating meets ISO16750-2 Pulse 5 requirements for 24 V systems. The device's –55 °C to +175 °C operating range further supports deployment in heavy-duty truck and off-highway applications.
Does ALS6W43A require external heat sinking beyond PCB copper area?
No external heat sink is required. The DO-218 package is designed for direct thermal coupling to a minimum 100 mm² copper pad on the PCB, which serves as the primary heatsink. Diodes' datasheet specifies thermal derating curves based solely on case temperature, confirming that adequate PCB copper area eliminates need for additional mechanical heatsinking in typical automotive mounting configurations.
ALS6W43A 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 66A
- 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
ALS6W43A FAQ
1.How can I place an order for ALS6W43A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W43A 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 ALS6W43A reliable?
The price and inventory of ALS6W43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W43A is usually 5 days.
3.What payment methods are accepted for ALS6W43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W43A?
ALS6W43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W43A 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 ALS6W43A?
For technical support, including ALS6W43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W43A requirements.
6.How does Aetrix verify that ALS6W43A is sourced from the original manufacturer or authorized distributors?
All ALS6W43A 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 ALS6W43A meets industry standards.
7.What is the process for return or replacement of ALS6W43A?
All ALS6W43A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W43A, 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 ALS6W43A part is unused and in its original packaging.
Return procedure for ALS6W43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W43A Tags
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