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Diodes Incorporated ALS6W26A
- Part No.:
- ALS6W26A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W26A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,059
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Product details
Overview
ALS6W26A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor diode in DO-218 package, rated for 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown (VBR), 4600 W peak pulse power (10/1000 µs), and 109 A peak pulse current, designed specifically for automotive ECU load dump protection per ISO7637-2 and ISO16750-2.
For engineers reviewing the ALS6W26A datasheet, ALS6W26A pinout, ALS6W26A application, or ALS6W26A equivalent, this device is selected for high-temperature-stable clamping in 12 V automotive systems where low forward voltage drop (≤1.9 V @ 100 A), low thermal resistance, and AEC-Q101 qualification are critical to protect sensitive downstream circuitry from inductive switching transients.
Technical Context
The ALS6W26A operates as a unidirectional TVS diode with anode-connected heatsink configuration, enabling efficient thermal dissipation during high-energy load dump events. Its 10/1000 µs waveform rating of 4600 W and 10/10,000 µs rating of 3600 W reflect robust energy handling across standardized surge profiles.
It exhibits ≤10 µA reverse leakage at 26 V (25 °C) and ≤150 µA at 175 °C, ensuring stable clamping performance under extended high-temperature operation. The device maintains clamping voltage ≤42.1 V at 109 A, limiting voltage overshoot to safe levels for 28 V nominal system interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines system working voltage margin. |
| VBR (min/max) | 28.9 V / 31.9 V - Breakdown onset range at 5 mA test current; ensures reliable turn-on within defined tolerance. |
| PPPM (10/1000 µs) | 4600 W - Peak pulse power capability for standard load dump waveform; determines transient energy absorption capacity. |
| VC @ IPPM | 42.1 V - Clamping voltage at 109 A peak pulse current; sets maximum voltage seen by protected ICs. |
| IFSM | 600 A - Non-repetitive forward surge current (8.3 ms half-sine); supports high-current inrush during fault conditions. |
| TJ Range | −55 °C to +175 °C - Operating junction temperature range; enables deployment in under-hood automotive environments. |
Pinout & Package
DO-218 plastic package with integrated heatsink terminal; polarity marked by cathode bar; heatsink serves as anode connection. Package dimensions: A = 4.75–5.25 mm, B = 3.66–4.26 mm, H = 13.20–13.80 mm; weight ≈2.74 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Main current path input / thermal interface | Electrically and thermally connected to PCB copper pour; must be soldered to large thermal pad for 175 °C operation. |
| Cathode (Bar-marked lead) | Clamped output / surge return path | Connected to protected circuit ground or low-side rail; carries full transient current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| ISO7637-2 & ISO16750-2 compliance | Validated for automotive load dump testing up to 100 V/100 ms exponential waveform, ensuring system-level reliability. |
| AEC-Q101 qualification | Passed stress tests including HTGB, HTRB, TCT, and UHAST; certified for automotive production use. |
| Low VF (≤1.9 V @ 100 A) | Minimizes conduction loss and self-heating during high-current surges, preserving clamping accuracy over time. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH; supports standard SMT reflow without baking preconditioning. |
| Halogen- and antimony-free "Green" construction | Meets RoHS 3 (2015/863/EU) with Br+Cl <1500 ppm and Sb <1000 ppm; compliant with automotive environmental directives. |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller I/O, CAN transceivers, and sensor interfaces in engine bay ECUs exposed to 12 V battery load dump events. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and protected subsystem ground. Use Value: Limits transient voltage to ≤42.1 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic components. | Use Scenario: Shields constant-current LED driver ICs and MOSFET switches in adaptive front lighting systems during alternator disconnection. IC Role / Device Role / Timing Role: High-power shunt clamp on main 12 V supply rail upstream of DC-DC converters. Use Value: Absorbs up to 4600 W for 1 ms, maintaining LED driver functionality without shutdown or reset. |
| Body Control Module Input Protection | Start-Stop System Power Rail Protection |
Use Scenario: Safeguards LIN transceivers, relay drivers, and power management ICs in BCMs subjected to repeated cold-crank and load dump cycles. IC Role / Device Role / Timing Role: Primary overvoltage suppression element on fused battery feed line. Use Value: Withstands ≥1000 surges at 80% PPPM rating while retaining ≤10 µA leakage at 26 V after thermal cycling. | Use Scenario: Secures buck controller inputs and gate drivers in start-stop battery management modules during engine restart voltage spikes. IC Role / Device Role / Timing Role: Fast-response clamping device on 12 V auxiliary rail feeding MCU and PMIC. Use Value: Delivers 109 A peak current with ≤42.1 V clamping, ensuring uninterrupted operation during 100 ms load dump pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower PPPM (400 W), SMA package, 26 V VWM, 42.1 V VC @ 9.9 A | Not suitable for automotive load dump; limited to low-energy ESD/surge events | Select only for non-automotive 12 V systems with <500 W surge requirements. |
| SMCJ26A | Higher PPPM (1500 W), SMC package, same VWM/VC, but lower IFSM (200 A) | Lacks AEC-Q101 qualification and ISO7637-2 validation | Acceptable for industrial control if automotive certification is not mandated. |
Compared with SMAJ26A and SMCJ26A, the ALS6W26A delivers 3× higher peak power handling, AEC-Q101 qualification, and verified ISO7637-2 compliance-making it the only option qualified for under-hood automotive load dump protection at 26 V system level.
Availability
ALS6W26A is available at Aetrix Electronics and suitable for automotive engine control units, LED lighting modules, body control modules, and start-stop system power rails requiring stable component supply with full automotive qualification traceability.
Supply support for ALS6W26A 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 protection, power management, and signal integrity solutions for automotive, industrial, and consumer markets.
The ALS6WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically to meet stringent ISO7637-2 load dump requirements and deliver robust clamping performance in high-temperature under-hood environments.
FAQ
What is the maximum clamping voltage of ALS6W26A at its rated peak pulse current?
The ALS6W26A has a maximum clamping voltage (VC) of 42.1 V when subjected to its peak pulse current (IPPM) of 109 A under a 10/1000 µs waveform. This value is measured and guaranteed per the datasheet's electrical characteristics table and ensures downstream components remain within safe operating voltage limits during load dump events.
Is ALS6W26A suitable for bidirectional transient suppression?
No, ALS6W26A is a unidirectional TVS diode, configured with anode-connected heatsink and cathode-bar marking. It conducts only during positive transients on the anode relative to cathode. For bidirectional protection, two devices in series-opposing configuration or a dedicated bidirectional TVS (e.g., SMBJ26CA) would be required.
How does the DO-218 package improve thermal performance compared to SMA or SMC packages?
The DO-218 package integrates a large metal heatsink terminal directly bonded to the die anode, reducing thermal resistance from junction-to-case (RθJC) and enabling sustained operation at 175 °C. Unlike SMA/SMC, its heatsink is electrically active and must be soldered to a ≥100 mm² copper area for optimal 4600 W pulse handling and thermal stability.
Does ALS6W26A require derating at elevated ambient temperatures?
Yes - the device's peak pulse power must be derated above 25 °C case temperature, per the published power derating curve. At 125 °C case temperature, PPPM drops to ~2600 W (57% of 4600 W), and at 175 °C, it falls to zero. Proper PCB thermal design and heatsink layout are essential to maintain performance in high-temperature automotive locations.
ALS6W26A 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 109A
- 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
ALS6W26A FAQ
1.How can I place an order for ALS6W26A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W26A 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 ALS6W26A reliable?
The price and inventory of ALS6W26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W26A is usually 5 days.
3.What payment methods are accepted for ALS6W26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W26A?
ALS6W26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W26A 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 ALS6W26A?
For technical support, including ALS6W26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W26A requirements.
6.How does Aetrix verify that ALS6W26A is sourced from the original manufacturer or authorized distributors?
All ALS6W26A 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 ALS6W26A meets industry standards.
7.What is the process for return or replacement of ALS6W26A?
All ALS6W26A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W26A, 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 ALS6W26A part is unused and in its original packaging.
Return procedure for ALS6W26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W26A Tags
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