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Diodes Incorporated ALS6W20A
- Part No.:
- ALS6W20A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W20A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,825
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Product details
Overview
ALS6W20A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 20 V standoff voltage (VWM), 22.2–24.5 V breakdown (VBR), 4600 W peak pulse power (10/1000 µs), and 142 A peak pulse current-designed specifically for automotive ECU load dump protection per ISO7637-2 and ISO16750-2.
For engineers reviewing the ALS6W20A datasheet, ALS6W20A pinout, ALS6W20A application, or ALS6W20A equivalent, key selection criteria include clamping voltage (32.4 V at IPPM), junction temperature range (−55 °C to +175 °C), unidirectional polarity, AEC-Q101 qualification, and DO-218 thermal performance under high-current surge conditions.
Technical Context
The ALS6W20A operates as a unidirectional TVS diode optimized for automotive load dump transients, featuring low clamping voltage (32.4 V) and high surge capability (600 A IFSM). Its DO-218 package provides low thermal resistance and supports 260 °C soldering, enabling robust thermal management in engine bay environments.
It meets ISO7637-2 Pulse 5a/b and ISO16750-2 load dump test profiles with specified 10/1000 µs and 10/10,000 µs waveforms, delivering 4600 W and 3600 W peak power respectively-critical for protecting sensitive 12 V automotive electronics against inductive switching surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown voltage range at 5 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 32.4 V - Clamping voltage at 142 A peak pulse; determines maximum protected circuit voltage during surge |
| PPPM (10/1000 µs) | 4600 W - Peak pulse power handling for standard load dump waveform; enables single-device protection of 12 V systems |
| IFSM | 600 A - Surge current rating for 8.3 ms half-sine wave; supports high-energy inductive kick events |
| TJ Range | −55 °C to +175 °C - Extended junction temperature range ensures reliability in under-hood automotive locations |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance |
Pinout & Package
DO-218 plastic package with heatsink-anode polarity: anode connected to metal base (heatsink tab), cathode marked by bar on molded body. Designed for high-power surface-mount mounting with low thermal resistance and 2.74 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Power return path & thermal interface | Electrically connected to internal die anode; serves as primary heat dissipation surface-must be soldered to copper pour or heatsink |
| Cathode (Marked End) | Transient voltage clamp output | Connected to protected circuit rail; conducts surge current to ground/anode when VRM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| ISO7637-2 & ISO16750-2 compliance | Validated for automotive load dump immunity testing-eliminates need for external test validation in Tier 1 designs |
| Low clamping voltage (32.4 V) | Minimizes overvoltage stress on downstream 36 V-rated ICs (e.g., CAN transceivers, MCU I/O) during 12 V system surges |
| DO-218 thermal performance | Enables 4600 W pulse handling without derating up to 125 °C case temperature-reduces need for oversized PCB copper |
| AEC-Q101 qualification | Includes HTRB, TC, and surge life testing-supports PPAP submission and long-term field reliability in automotive ECUs |
| Lead-free & halogen-free | RoHS 3 compliant with <900 ppm Br/Cl and <1000 ppm Sb-meets global automotive environmental requirements |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protects 12 V power input of gasoline/diesel engine ECUs against alternator load dump surges during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and upstream fuse-conducts surge current to chassis ground during VRM exceedance. Use Value: Limits peak voltage to 32.4 V, preventing damage to 36 V-rated power management ICs and microcontrollers without requiring additional series impedance. | Use Scenario: Shields BCM power supply from load dump events induced by high-current loads (e.g., headlight relays, HVAC blower motors). IC Role / Device Role / Timing Role: Primary transient suppressor on main 12 V input, positioned after main fuse and before DC-DC converter input stage. Use Value: Withstands 600 A surge current and maintains clamping below 33 V-preserving functionality of LIN/CAN physical layers and EEPROM during repeated surges. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Module |
Use Scenario: Safeguards 12 V input of rear-view or surround-view camera modules mounted near engine compartment. IC Role / Device Role / Timing Role: Standoff-rated TVS placed directly at connector entry point-clamps transients before they propagate into image sensor and ISP power domains. Use Value: −55 °C to +175 °C operation ensures reliability in high-ambient-temperature camera housings; low leakage (<10 µA at VWM) avoids quiescent current penalty. | Use Scenario: Protects EPS motor driver power stage from load dump surges generated by alternator regulation faults. IC Role / Device Role / Timing Role: High-energy TVS integrated into main power board near battery connector-shunts surge energy away from gate drivers and current sense amplifiers. Use Value: 4600 W peak power rating handles worst-case ISO7637-2 Pulse 5a without degradation; DO-218 thermal design sustains >100,000 surge cycles at 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A (onsemi) | DO-214AC package; 400 W PPPM; 32.4 V VC; 12.3 A IPPM | Limited to low-energy transients (e.g., ISO10605 ESD); insufficient for load dump | Select only for ESD-only protection where surge energy <50 mJ |
| SMCJ20A (Littelfuse) | DO-214AB package; 1500 W PPPM; 32.4 V VC; 46.4 A IPPM | Meets ISO7637-2 Pulse 5a only at reduced pulse width; not validated for full 10/1000 µs load dump | Acceptable for cost-sensitive non-critical 12 V modules with derated surge margin |
Compared with SMAJ20A and SMCJ20A, ALS6W20A delivers 3× higher peak power and 3× higher surge current in a thermally superior DO-218 package-making it the only option qualified for full automotive load dump compliance without parallel devices or external heatsinking.
Availability
ALS6W20A is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across multi-year vehicle production cycles.
Supply support for ALS6W20A 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-with AEC-Q101 and PPAP capabilities across its protection portfolio.
The ALS6WxxA series is part of Diodes' automotive-grade TVS product line, engineered specifically for load dump immunity in 12 V vehicle electrical systems-emphasizing high surge capacity, extended temperature operation, and regulatory compliance.
FAQ
What is the polarity configuration of ALS6W20A and how must it be mounted?
The ALS6W20A is unidirectional with anode connected to the metal heatsink tab and cathode marked by a bar on the molded body. It must be mounted with the tab soldered to a grounded copper pour or chassis-connected thermal pad to ensure low-impedance surge current return path and effective heat dissipation-reverse orientation will cause catastrophic failure during surge events.
Does ALS6W20A meet both ISO7637-2 and ISO16750-2 standards, and under what test conditions?
Yes-ALS6W20A is validated for ISO7637-2 Pulse 5a (12 V system, 10 Ω source impedance, 10/1000 µs) and ISO16750-2 Load Dump (12 V nominal, 10/1000 µs, 4600 W). Test reports confirm compliance at TA = 25 °C and TC = 85 °C with no parameter degradation after 1000 pulses, per Diodes' qualification documentation.
How does the DO-218 package improve thermal performance compared to DO-214AB or DO-214AC?
The DO-218 package features a larger metal heatsink tab (13.5 mm × 9.0 mm) and lower thermal resistance (RθJC ≈ 1.2 °C/W vs. ~3.5 °C/W for DO-214AB), enabling 4600 W pulse handling without external heatsink. Its 2.74 g mass and optimized mold compound also reduce thermal runaway risk during repetitive surges at elevated ambient temperatures.
Can ALS6W20A be used in 24 V commercial vehicle applications?
No-ALS6W20A is rated for 20 V standoff and 32.4 V clamping, making it suitable only for 12 V automotive systems. For 24 V applications, Diodes offers ALS6W40A (40 V VWM, 64.5 V VC) and ALS6W43A (43 V VWM, 69.4 V VC), both in the same DO-218 package and qualified to identical automotive standards.
ALS6W20A 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 142A
- 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
ALS6W20A FAQ
1.How can I place an order for ALS6W20A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W20A 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 ALS6W20A reliable?
The price and inventory of ALS6W20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W20A is usually 5 days.
3.What payment methods are accepted for ALS6W20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W20A?
ALS6W20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W20A 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 ALS6W20A?
For technical support, including ALS6W20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W20A requirements.
6.How does Aetrix verify that ALS6W20A is sourced from the original manufacturer or authorized distributors?
All ALS6W20A 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 ALS6W20A meets industry standards.
7.What is the process for return or replacement of ALS6W20A?
All ALS6W20A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W20A, 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 ALS6W20A part is unused and in its original packaging.
Return procedure for ALS6W20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W20A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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