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Diodes Incorporated ALS6W33A
- Part No.:
- ALS6W33A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W33A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:5,048
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Product details
Overview
ALS6W33A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown (VBR), 4600 W peak pulse power (10/1000 µs), and 600 A forward surge current-designed specifically for automotive ECU load dump protection per ISO7637-2 and ISO16750-2.
For engineers reviewing the ALS6W33A datasheet, ALS6W33A pinout, ALS6W33A application, or ALS6W33A equivalent, key selection criteria include clamping voltage (53.3 V at 86 A), thermal stability up to +175 °C junction temperature, low forward voltage drop (≤1.9 V at 100 A), AEC-Q101 qualification, and DO-218 mechanical compatibility with high-power automotive PCB layouts.
Technical Context
The ALS6W33A operates as a unidirectional TVS diode optimized for high-energy load dump transients in 12 V automotive systems. Its silicon avalanche structure delivers precise 33 V stand-off with tight 36.7–40.6 V breakdown tolerance and clamps to 53.3 V at 86 A (10/1000 µs), limiting voltage overshoot during generator disconnection events.
It features low thermal resistance due to its DO-218 package with heatsink-anode construction, enabling stable operation from −55 °C to +175 °C. The device meets MSL Level 1, supports 260 °C reflow, and maintains ≤10 µA reverse leakage at VWM up to 175 °C-critical for long-term reliability in engine bay environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 36.7 V / 40.6 V - guaranteed avalanche onset range at 5 mA test current |
| VC @ IPPM | 53.3 V - clamping voltage at 86 A peak pulse current (10/1000 µs), defining worst-case voltage seen by protected IC |
| PPPM (10/1000 µs) | 4600 W - peak transient energy absorption capability under standard load dump waveform |
| IFSM | 600 A - surge current handling for 8.3 ms half-sine, supporting high-current inductive switch-off events |
| TJ Range | −55 °C to +175 °C - validated junction temperature window for under-hood automotive deployment |
| Polarity | Unidirectional - anode connected to heatsink, cathode marked with bar; blocks reverse voltage, conducts forward surges |
Pinout & Package
DO-218 plastic package with heatsink-anode configuration: anode terminal is the metal slug/base (electrically and thermally connected to heatsink), cathode is the leaded terminal marked with a bar. Designed for high-power surface-mount mounting with 2.74 g mass and UL94-V0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Slug) | Power return path & thermal interface | Electrically tied to PCB copper pour for heat dissipation; must be soldered to thermal pad per JEDEC layout guidelines |
| Cathode (Leaded Terminal) | Transient voltage sensing & clamping node | Connected to protected line (e.g., battery rail); avalanche conduction occurs when voltage exceeds VBR toward anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
| ISO7637-2 & ISO16750-2 compliant | Passes Pulse 5a (load dump) testing up to 4600 W without degradation |
| Low VF (≤1.9 V @ 100 A) | Minimizes conduction loss and self-heating during sustained forward surge events |
| MSL Level 1 | Zero moisture sensitivity-safe for standard SMT reflow without baking |
| Halogen & antimony free | Meets "Green" definition: Br+Cl <1500 ppm, Sb <1000 ppm-compliant with automotive environmental mandates |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Generator disconnection during engine run causes 12 V system voltage spike up to 60 V for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS clamps battery rail to ≤53.3 V within nanoseconds, protecting MCU, CAN transceivers, and analog sensors. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails downstream of DC-DC converters during ISO7637-2 Pulse 5a events. | Use Scenario: Load switching of high-current lighting (headlamps, fog lamps) induces inductive kickback on shared 12 V supply. IC Role / Device Role / Timing Role: Absorbs reverse-energy transients before they propagate to microcontroller power inputs and LIN bus drivers. Use Value: Enables robust 12 V-to-3.3 V power architecture without oversized input capacitors or secondary filtering stages. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Voltage transients from adjacent motor drivers or solenoid actuators couple into camera module power input. IC Role / Device Role / Timing Role: Fast-response clamping element placed at main 12 V entry point, upstream of LDOs and image signal processors. Use Value: Maintains clean power delivery to CIS sensors during vehicle start-stop cycles and regenerative braking events. | Use Scenario: High-current motor commutation in EPS generates repetitive load dump spikes on the main power bus. IC Role / Device Role / Timing Role: Primary overvoltage suppression device mounted directly on power board near motor driver ICs. Use Value: Extends lifetime of gate drivers and current sense amplifiers by limiting peak voltage stress to <55 V across full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPPM (400 W), SMA package, 53.3 V VC but only 12.3 A IPPM | Not suitable for full ISO7637-2 Pulse 5a compliance; limited to low-energy transients | Select only for cost-sensitive non-automotive or auxiliary circuits with <1 kW surge exposure |
| SMCJ33A | Same VWM/VC, but 3000 W PPPM (10/1000 µs) and DO-214AB package | Lacks AEC-Q101 qualification and 175 °C rating; not validated for under-hood use | Acceptable for industrial control panels where ambient temperature stays <125 °C and PPAP not required |
Compared with SMAJ33A and SMCJ33A, ALS6W33A uniquely combines 4600 W surge capacity, AEC-Q101 qualification, and DO-218 thermal performance-making it the only option certified for front-end load dump protection in modern automotive ECUs requiring full ISO16750-2 compliance.
Availability
ALS6W33A is available at Aetrix Electronics and suitable for automotive ECU protection, body control module power rail stabilization, and ADAS camera module transient suppression requiring stable component supply across extended temperature and high-reliability production programs.
Supply support for ALS6W33A 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 belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for load dump surge immunity in 12 V vehicle electrical systems-prioritizing high peak power, thermal robustness, and AEC-Q101 validation.
FAQ
What is the maximum clamping voltage of ALS6W33A under standard load dump conditions?
The ALS6W33A clamps to 53.3 V at 86 A peak pulse current (10/1000 µs waveform), as specified in the datasheet's Electrical Characteristics table. This value is measured at 25 °C and remains stable across the full −55 °C to +175 °C junction temperature range, ensuring consistent protection during engine bay thermal cycling.
Is ALS6W33A suitable for bidirectional transient suppression?
No-ALS6W33A is a unidirectional TVS diode with anode connected to the heatsink and cathode marked by a bar. It conducts only in the forward direction during overvoltage events. For bidirectional protection (e.g., against both load dump and jump-start transients), a separate bidirectional device such as the D24Z33Q is required.
How does the DO-218 package improve thermal performance compared to SMA or SMC packages?
The DO-218 package uses a large metal heatsink slug as the anode terminal, providing direct thermal conduction to the PCB copper area. Its thermal resistance (RθJC) is significantly lower than SMA or SMC, enabling 4600 W surge dissipation without exceeding 175 °C junction temperature-even at 125 °C case temperature-as confirmed in Figure 2 of the datasheet.
Does ALS6W33A require derating at elevated ambient temperatures?
Yes-power derating is required above 25 °C ambient. Per Figure 1 in the datasheet, allowable peak pulse power drops linearly from 4600 W at 25 °C to ~2800 W at 125 °C case temperature. Designers must reference the power derating curve and ensure adequate PCB copper area and airflow to maintain safe junction temperature during repeated surge events.
ALS6W33A 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 86A
- 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
ALS6W33A FAQ
1.How can I place an order for ALS6W33A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W33A 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 ALS6W33A reliable?
The price and inventory of ALS6W33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W33A is usually 5 days.
3.What payment methods are accepted for ALS6W33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W33A?
ALS6W33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W33A 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 ALS6W33A?
For technical support, including ALS6W33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W33A requirements.
6.How does Aetrix verify that ALS6W33A is sourced from the original manufacturer or authorized distributors?
All ALS6W33A 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 ALS6W33A meets industry standards.
7.What is the process for return or replacement of ALS6W33A?
All ALS6W33A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W33A, 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 ALS6W33A part is unused and in its original packaging.
Return procedure for ALS6W33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W33A Tags
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