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Diodes Incorporated ALS6W24A
- Part No.:
- ALS6W24A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W24A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,573
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Product details
Overview
ALS6W24A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown (VBR), 4600 W peak pulse power (10/1000 µs), and 600 A surge current (IFSM), designed specifically for automotive ECU load dump protection.
For engineers reviewing the ALS6W24A datasheet, ALS6W24A pinout, ALS6W24A application, or ALS6W24A equivalent, key selection criteria include clamping voltage (38.9 V at 118 A), thermal stability up to +175 °C junction temperature, AEC-Q101 qualification, ISO7637-2/ISO16750-2 compliance, and DO-218 mechanical compatibility with high-power automotive PCB layouts.
Technical Context
The ALS6W24A operates as a unidirectional TVS diode optimized for high-energy automotive load dump transients-clamping reverse surges induced by sudden battery disconnection in 12 V systems. Its DO-218 package provides low thermal resistance and heatsink-anode polarity for efficient heat dissipation during 10 ms exponential waveform events.
It delivers 4600 W peak pulse power under 10/1000 µs waveform and retains 3600 W under longer 10/10,000 µs stress, with maximum clamping voltage of 38.9 V at 118 A IPPM and reverse leakage ≤10 µA at 24 V and 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Stand-off voltage ensuring no conduction during normal 12 V system operation with margin |
| VBR (min/max) | 26.7 / 29.5 V - Verified breakdown range at 5 mA test current, defining turn-on threshold |
| VC @ IPPM | 38.9 V - Clamping voltage at 118 A peak pulse, limiting downstream IC stress during load dump |
| PPPM (10/1000 µs) | 4600 W - Sustains high-energy transients per ISO7637-2 Pulse 5a without failure |
| IFSM | 600 A - Withstands 8.3 ms half-sine surge, critical for engine cranking and alternator regulation events |
| TJ Range | −55 to +175 °C - Enables placement near hot ECU components without derating loss |
| Polarity | Unidirectional, anode = heatsink - Requires correct PCB layout with thermal pad tied to ground plane or heatsink |
Pinout & Package
ALS6W24A uses the DO-218 plastic package with heatsink-anode configuration: the metal slug (heatsink) serves as the anode terminal, while the cathode is marked by a bar on the molded body. This single-terminal polarity design simplifies thermal management but mandates correct orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Slug) | Positive input / Power return path | Electrically and thermally connected to PCB copper pour or heatsink; must be soldered to ≥200 mm² thermal pad |
| Cathode (Marked End) | Clamping output / Transient sink | Connected to protected line (e.g., ECU supply rail); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use across −55 °C to +175 °C with HTOL, TC, and HTRB testing |
| ISO7637-2 & ISO16750-2 compliant | Passes Pulse 5a (load dump) up to 100 V/10 ms exponential waveform without degradation |
| Low thermal resistance | RθJC ≈ 0.8 °C/W (typ.) enables >3 kW sustained clamping power at 125 °C case temperature |
| Lead-free & Halogen-free | RoHS 3 compliant with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets automotive green material requirements |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85% RH; supports standard SMT reflow up to 260 °C/10 s |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protects microcontroller and CAN transceivers from 100 V/10 ms load dump transients during alternator field collapse. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery feed and LDO input, conducting only during overvoltage events. Use Value: Limits rail voltage to ≤38.9 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic supplies. | Use Scenario: Shields LIN transceivers and LED drivers from coupled surges in vehicle lighting control circuits. IC Role / Device Role / Timing Role: Primary transient suppressor on 12 V switched power bus feeding BCM sub-modules. Use Value: Absorbs 4600 W pulses without derating at +105 °C ambient, maintaining system uptime during repeated load switching. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards image sensor and ISP power inputs against battery disconnection spikes in rear-view cameras. IC Role / Device Role / Timing Role: Front-end TVS on camera module's 12 V input, upstream of DC-DC converter. Use Value: Clamps within 1 ns to protect sensitive analog front-ends, with <10 µA leakage preserving low-power sleep mode integrity. | Use Scenario: Guards gate driver ICs and current sense amplifiers from inductive kickback during EPS motor commutation. IC Role / Device Role / Timing Role: High-current transient suppressor on motor phase supply rail, co-located with power MOSFETs. Use Value: Handles 600 A IFSM surges while maintaining <1.9 V forward drop at 100 A, minimizing conduction loss during fault clearing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), SMA package, 33.2 V VC at 12.3 A | Not suitable for full ISO7637-2 Pulse 5a; limited to low-energy subsystems | Select only for non-critical 12 V accessories where peak power <500 W |
| SMCJ24A | Higher PPPM (1500 W), SMC package, 38.9 V VC at 38.9 A | Meets ISO7637-2 Pulse 5b but not Pulse 5a; insufficient for full load dump | Acceptable for cost-sensitive BCMs with external energy-limiting resistors |
Compared with SMAJ24A and SMCJ24A, ALS6W24A uniquely supports full 4600 W ISO7637-2 Pulse 5a load dump events in a surface-mount DO-218 package, enabling direct replacement of through-hole TVS without redesigning thermal layout or sacrificing automotive qualification.
Availability
ALS6W24A is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, body control module (BCM) rail stabilization, and electric power steering (EPS) supply safeguarding requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for ALS6W24A 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 power management, signal integrity, and protection solutions for automotive, industrial, and computing markets.
The ALS6WxxA series is part of Diodes' automotive-grade TVS portfolio, engineered specifically to meet stringent ISO7637-2 load dump and ISO16750-2 surge immunity requirements in engine bay and chassis-mounted electronic control units.
FAQ
What is the maximum clamping voltage of ALS6W24A under load dump conditions?
The ALS6W24A has a maximum clamping voltage (VC) of 38.9 V at 118 A peak pulse current (IPPM) under 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream 24 V-rated components remain within safe operating limits during ISO7637-2 Pulse 5a events.
Can ALS6W24A be used in 24 V commercial vehicle systems?
No-ALS6W24A is specified for 12 V nominal automotive systems with 24 V stand-off. For 24 V systems, Diodes offers ALS6W43A (43 V VWM). Using ALS6W24A in 24 V applications risks premature conduction and thermal runaway due to insufficient voltage margin above normal rail voltage.
Is the DO-218 package lead-free and RoHS 3 compliant?
Yes-ALS6W24A features matte tin-plated terminals and halogen/antimony-free molding compound, fully compliant with EU RoHS Directive 2015/863/EU (RoHS 3). Total bromine and chlorine content is <900 ppm each (<1500 ppm combined), and antimony <1000 ppm, certified per Diodes' Green Product definition.
How does the heatsink-anode configuration affect PCB layout?
The anode is the metal slug (heatsink), requiring direct solder connection to a large copper area (≥200 mm²) for thermal performance. Cathode connects to the protected line. Incorrect orientation-e.g., floating anode-causes thermal failure under surge. Layout must follow Diodes' recommended solder pad dimensions and stencil aperture per datasheet Fig. 12.
ALS6W24A 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 118A
- 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
ALS6W24A FAQ
1.How can I place an order for ALS6W24A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W24A 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 ALS6W24A reliable?
The price and inventory of ALS6W24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W24A is usually 5 days.
3.What payment methods are accepted for ALS6W24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W24A?
ALS6W24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W24A 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 ALS6W24A?
For technical support, including ALS6W24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W24A requirements.
6.How does Aetrix verify that ALS6W24A is sourced from the original manufacturer or authorized distributors?
All ALS6W24A 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 ALS6W24A meets industry standards.
7.What is the process for return or replacement of ALS6W24A?
All ALS6W24A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W24A, 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 ALS6W24A part is unused and in its original packaging.
Return procedure for ALS6W24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W24A Tags
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