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Diodes Incorporated ALS6W12A
- Part No.:
- ALS6W12A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W12A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,790
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Product details
Overview
ALS6W12A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 4600 W peak pulse power (10/1000 µs), and 231 A peak pulse current, designed for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS6W12A datasheet, ALS6W12A pinout, ALS6W12A application, or ALS6W12A equivalent, key selection criteria include clamping voltage (19.9 V at 231 A), unidirectional polarity, 175 °C junction temperature rating, AEC-Q101 qualification, and DO-218 thermal performance for high-reliability under-hood electronics.
Technical Context
The ALS6W12A operates as a unidirectional TVS diode optimized for automotive load dump suppression per ISO 7637-2 and ISO 16750-2. Its 12 V stand-off voltage enables stable operation across 12 V battery systems while maintaining low leakage (<10 µA at VWM) up to 175 °C.
It delivers 4600 W peak pulse power under 10/1000 µs waveform with 19.9 V clamping voltage at 231 A, and sustains 3600 W under longer 10/10,000 µs surge. The DO-218 package provides low thermal resistance and heatsink-anode polarity for efficient PCB heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12.0 V - Stand-off voltage ensuring no conduction during normal 12 V system operation |
| VBR (min/max) | 13.3 / 14.7 V - Verified breakdown range at 5 mA, guaranteeing reliable turn-on before damaging overvoltage |
| VC @ IPPM | 19.9 V - Clamping voltage at 231 A peak pulse, limiting downstream IC stress during load dump |
| PPPM (10/1000 µs) | 4600 W - Sustained surge energy handling for worst-case ISO 7637-2 Pulse 5a events |
| IFSM | 600 A - Forward surge capability supporting high-current inductive switch-off events |
| TJ Range | −55 to +175 °C - Full automotive temperature coverage including under-hood hot zones |
| AEC-Q101 | Qualified - Validated reliability for automotive electronic control units per stress test standard |
Pinout & Package
DO-218 plastic package with heatsink-anode polarity; cathode marked by bar on case top; anode connected to metal slug for thermal path to PCB heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Slug) | Power return path & thermal interface | Electrically and thermally connects to PCB copper pour for low RθJC and sustained power dissipation |
| Cathode (Top Surface Bar) | Transient voltage clamp node | Connected to protected line (e.g., ECU power rail); conducts surge current to ground/anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature stability | Leakage <10 µA at VWM up to 175 °C ensures consistent clamping behavior in engine bay environments |
| Low clamping ratio | VC/VWM = 1.66 (19.9 V / 12 V) minimizes overvoltage exposure to downstream 12 V-rated ICs |
| Automotive qualification | AEC-Q101 qualified and PPAP capable supports Tier-1 production release without additional qualification effort |
| RoHS & Green compliance | Lead-free, halogen- and antimony-free per EU RoHS 3 and UL94-V0 molding compound meets global automotive environmental mandates |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller power rails in gasoline/diesel ECUs exposed to alternator load dump surges up to 40 V. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery input and LDO/regulator input. Use Value: Limits transient voltage to 19.9 V, preventing latch-up or damage to 28 V-rated power management ICs and MCU I/O. | Use Scenario: Shields constant-current LED driver ICs in adaptive front lighting systems (AFS) from 12 V bus transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on high-side switch input, activated within nanoseconds of surge onset. Use Value: Enables use of cost-optimized 24 V-rated drivers instead of 60 V+ parts, reducing BOM cost and footprint. |
| Body Control Module (BCM) | Start-Stop System Relay Driver |
Use Scenario: Safeguards CAN transceivers and power switches in BCMs managing door locks, windows, and lighting loads. IC Role / Device Role / Timing Role: Parallel-connected TVS on 12 V supply rail upstream of DC-DC converters and level shifters. Use Value: Maintains signal integrity by suppressing sub-100 ns transients that could corrupt CAN frame timing or reset logic. | Use Scenario: Protects high-current MOSFET gate drivers controlling starter solenoid relays during aggressive start-stop cycling. IC Role / Device Role / Timing Role: Clamp device on relay coil flyback path and main power input to driver IC. Use Value: Prevents driver IC destruction from 600 A inductive kickback, extending system lifetime beyond 100,000 cycles. |
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 |
|---|---|---|---|
| SMAJ12A | 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 requirements |
| SMCJ12A | Higher PPPM (1500 W), SMC package, 19.9 V clamping at 75.3 A | Fails 4600 W load dump test; insufficient for full-spec automotive ECU protection | Acceptable for auxiliary modules (e.g., infotainment) but not primary power rail protection |
Compared with SMAJ12A and SMCJ12A, ALS6W12A uniquely satisfies full ISO 7637-2 Pulse 5a load dump immunity with 4600 W rating and DO-218 thermal robustness-enabling single-device protection without parallel stacking or derating.
Availability
ALS6W12A is available at Aetrix Electronics and suitable for automotive engine control units, LED lighting drivers, body control modules, and start-stop system designs requiring stable component supply across extended temperature and high-surge environments.
Supply support for ALS6W12A 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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The ALS6WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 load dump protection in 12 V vehicle electrical systems with emphasis on thermal survivability and AEC-Q101 compliance.
FAQ
What is the maximum clamping voltage of ALS6W12A at its rated peak pulse current?
The ALS6W12A clamps to 19.9 V at its specified peak pulse current of 231 A under 10/1000 µs waveform. This value is measured and guaranteed per datasheet Figure 1 and Electrical Characteristics table, ensuring predictable overvoltage limiting for downstream 24 V-rated ICs.
Is ALS6W12A suitable for bidirectional transient suppression?
No. ALS6W12A is a unidirectional TVS diode with anode-heatsink polarity and cathode marking. It conducts only during positive transients relative to ground. For bidirectional protection (e.g., data lines), separate devices like P6SMB12CA or dedicated bidirectional TVS arrays are required.
How does the DO-218 package improve thermal performance over SMA or SMC packages?
The DO-218's integrated metal slug anode provides direct thermal conduction to PCB copper, achieving lower junction-to-case resistance (RθJC). At 175 °C ambient, it sustains 4600 W surges where SMA/SMC packages would thermally saturate below 1500 W due to higher thermal impedance and smaller thermal mass.
Does ALS6W12A require external series impedance for safe operation?
No external series resistor is required for basic load dump clamping. Its low dynamic impedance and 600 A IFSM rating allow direct placement on 12 V rail. However, a small ferrite bead may be added near the cathode to damp high-frequency ringing without affecting clamping response time.
ALS6W12A 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 231A
- 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
ALS6W12A FAQ
1.How can I place an order for ALS6W12A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W12A 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 ALS6W12A reliable?
The price and inventory of ALS6W12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W12A is usually 5 days.
3.What payment methods are accepted for ALS6W12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W12A?
ALS6W12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W12A 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 ALS6W12A?
For technical support, including ALS6W12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W12A requirements.
6.How does Aetrix verify that ALS6W12A is sourced from the original manufacturer or authorized distributors?
All ALS6W12A 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 ALS6W12A meets industry standards.
7.What is the process for return or replacement of ALS6W12A?
All ALS6W12A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W12A, 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 ALS6W12A part is unused and in its original packaging.
Return procedure for ALS6W12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W12A Tags
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