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Diodes Incorporated ALS6W22A
- Part No.:
- ALS6W22A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W22A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
ALS6W22A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 22 V standoff voltage (VWM), 24.4–26.9 V breakdown (VBR), 4600 W peak pulse power (10/1000 µs), and 130 A peak pulse current, designed specifically for automotive ECU load dump protection.
For engineers reviewing the ALS6W22A datasheet, ALS6W22A pinout, ALS6W22A application, or ALS6W22A equivalent, key selection criteria include clamping voltage (35.5 V at 130 A), thermal stability up to +175 °C junction temperature, AEC-Q101 qualification, and compliance with ISO7637-2 and ISO16750-2 surge test profiles.
Technical Context
The ALS6W22A operates as a unidirectional TVS diode with anode-connected heatsink configuration, optimized for high-energy transient suppression during automotive 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 durations.
It features low forward voltage drop (≤1.9 V at 100 A), low reverse leakage (≤10 µA at VWM), and stable performance from −55 °C to +175 °C, enabling reliable operation in under-hood automotive environments where thermal cycling and high ambient temperatures are common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown voltage range at 5 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 35.5 V - Clamping voltage at 130 A peak pulse current; determines protected circuit stress level |
| PPPM (10/1000 µs) | 4600 W - Peak surge power capability; supports ISO7637-2 Pulse 5a load dump immunity |
| IFSM | 600 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush |
| TJ Range | −55 °C to +175 °C - Extended junction temperature range enables direct mounting on hot ECU heatsinks |
Pinout & Package
Package: DO-218 plastic outline with integral heatsink; anode terminal is the metal heatsink base, cathode marked by bar on molded body; matte tin-plated terminals compliant with MIL-STD-750 Method 2026 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Base) | Current entry point during clamping | Electrically and thermally connected to PCB copper pour; primary heat dissipation path |
| Cathode (Top Lead) | Current exit point during clamping | Connected to protected line (e.g., 24 V rail); polarity-sensitive installation required |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - ensures reliability for production automotive ECUs |
| High-temperature stability | Rated to +175 °C junction temperature - eliminates derating concerns in engine bay applications |
| Low thermal resistance | DO-218 package with metal heatsink base - enables efficient conduction cooling without external heatsink |
| Surge standard compliance | Fully meets ISO7637-2 and ISO16750-2 load dump test requirements - reduces need for additional validation |
| Green manufacturing | Halogen- and antimony-free, RoHS 3 compliant - satisfies Tier 1 automotive environmental mandates |
Applications
| Engine Control Unit Protection | Commercial Vehicle Lighting Control |
|---|---|
Use Scenario: Protecting 24 V microcontroller power rails in diesel engine ECUs exposed to 120 V load dump transients. IC Role / Device Role: Unidirectional clamping diode placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤35.5 V, preventing damage to downstream 40 V-rated regulators and MCU IOs. | Use Scenario: Safeguarding LED driver ICs in heavy-duty truck headlamp modules during alternator field collapse. IC Role / Device Role: Primary surge shunt on 24 V supply line upstream of buck controller. Use Value: Absorbs 4600 W surges without degradation, maintaining light output stability during ignition cycles. |
| Off-Highway Equipment Telematics | Hybrid Powertrain Battery Management |
Use Scenario: Securing CAN transceiver power supplies in GPS-enabled construction equipment subject to repeated load dumps. IC Role / Device Role: Standoff-clamped TVS on VCC rail feeding isolated CAN PHY. Use Value: Maintains <10 µA leakage at 22 V, ensuring low quiescent current in always-on telematics nodes. | Use Scenario: Protecting auxiliary 24 V bus in 48 V mild-hybrid systems during regenerative braking-induced voltage spikes. IC Role / Device Role: Bidirectional-capable unidirectional TVS used in conjunction with reverse-polarity protection MOSFET. Use Value: Withstands 600 A surge (8.3 ms) without bond wire failure, preserving BMS sensor accuracy during transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400 W), SMA package, 33.2 V clamping at 12.3 A | Not suitable for ISO7637-2 Pulse 5a; limited to low-energy transients | Select only for non-automotive 24 V systems with <500 W surge exposure |
| SMCJ22A | Higher PPPM (1500 W), SMC package, 35.5 V clamping at 42.3 A | Lacks AEC-Q101 qualification and 175 °C rating; not PPAP-capable | Acceptable for industrial control if automotive qualification is not mandated |
Compared with SMAJ22A and SMCJ22A, the ALS6W22A delivers 3× higher surge power handling, full automotive qualification, and superior thermal management-making it the only choice for production-grade 24 V load dump protection where reliability and regulatory compliance are mandatory.
Availability
ALS6W22A is available at Aetrix Electronics and suitable for automotive ECU design, commercial vehicle lighting control, off-highway telematics, and hybrid powertrain BMS requiring stable component supply across extended product lifecycles.
Supply support for ALS6W22A 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The ALS6WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for high-energy load dump suppression in 12 V and 24 V vehicle electrical systems per ISO standards.
FAQ
What is the maximum clamping voltage of ALS6W22A at its rated peak pulse current?
The ALS6W22A exhibits a maximum clamping voltage (VC) of 35.5 V when subjected to its specified peak pulse current of 130 A under the 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case load dump events.
Is ALS6W22A suitable for bidirectional transient suppression?
No, ALS6W22A is a unidirectional TVS diode with anode-heatsink polarity. It conducts only during positive transients on the cathode side relative to the anode. For bidirectional protection, two devices must be used in series-opposing configuration or a dedicated bidirectional TVS selected.
How does the DO-218 package improve thermal performance over standard SMC packages?
The DO-218 package integrates a large metal heatsink base directly connected to the anode, providing significantly lower thermal resistance from junction to PCB. This allows >3× higher sustained power dissipation compared to SMCJ devices and eliminates reliance on small lead-frame thermal paths alone.
Does ALS6W22A require derating at elevated ambient temperatures?
Yes - its peak pulse power must be derated above 25 °C case temperature, following the published power derating curve (Fig.1). At 125 °C case temperature, maximum PPPM drops to ~2600 W for 10/1000 µs waveforms, reflecting reduced thermal margin for energy absorption.
ALS6W22A 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 130A
- 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
ALS6W22A FAQ
1.How can I place an order for ALS6W22A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W22A 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 ALS6W22A reliable?
The price and inventory of ALS6W22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W22A is usually 5 days.
3.What payment methods are accepted for ALS6W22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W22A?
ALS6W22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W22A 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 ALS6W22A?
For technical support, including ALS6W22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W22A requirements.
6.How does Aetrix verify that ALS6W22A is sourced from the original manufacturer or authorized distributors?
All ALS6W22A 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 ALS6W22A meets industry standards.
7.What is the process for return or replacement of ALS6W22A?
All ALS6W22A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W22A, 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 ALS6W22A part is unused and in its original packaging.
Return procedure for ALS6W22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W22A Tags
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