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Diodes Incorporated ALS8W24A
- Part No.:
- ALS8W24A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W24A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,447
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Product details
Overview
ALS8W24A 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), 6600 W peak pulse power (10/1000 μs), and 170 A peak pulse current, designed for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W24A datasheet, ALS8W24A pinout, ALS8W24A application, or ALS8W24A equivalent, key selection criteria include clamping voltage (38.9 V at 170 A), thermal resistance performance up to +175°C junction temperature, unidirectional polarity with heatsink-anode configuration, and compliance with AEC-Q101 and ISO16750-2 surge requirements.
Technical Context
The ALS8W24A operates as a unidirectional TVS diode optimized for high-energy automotive load dump suppression. It features a low clamping ratio (VC/VBR ≈ 1.37), 1.8 V forward voltage at 100 A (8.3 ms half-sine), and thermal stability across −55°C to +175°C operating range.
Its DO-218 package provides low thermal resistance and high surge robustness, supporting 700 A non-repetitive forward surge current (IFSM) and meeting ISO 7637-2 Pulse 5a/b test conditions under defined mounting and PCB layout constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum continuous reverse operating voltage before significant leakage |
| VBR (min/max) | 26.7 V / 29.5 V - Voltage range at 5 mA test current where breakdown begins |
| VC @ IPPM | 38.9 V - Clamping voltage at 170 A peak pulse current (10/1000 μs) |
| PPPM (10/1000 μs) | 6600 W - Peak transient power handling capability under standard surge waveform |
| ID @ VWM | 10 μA - Reverse leakage current at rated stand-off voltage, ensuring low standby loss |
| TJ Range | −55°C to +175°C - Validated junction temperature range for automotive under-hood deployment |
| IFSM | 700 A - Non-repetitive forward surge current rating (8.3 ms half-sine), critical for inrush tolerance |
Pinout & Package
Package: DO-218 - Surface-mount plastic case with integral heatsink tab (anode), matte tin-plated terminals, moisture sensitivity level 1, and +260°C soldering capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Current input / thermal path | Electrically active anode terminal; primary thermal conduction path to PCB copper pour |
| Cathode (Bar-marked lead) | Current output / clamping node | Marked terminal connected to protected circuit rail; sinks surge current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified, manufactured in IATF 16949 certified facilities for production automotive use |
| High-temperature stability | Specified leakage and clamping performance maintained up to +175°C TJ |
| Low thermal resistance | DO-218 package enables efficient heat dissipation via heatsink-tab mounting |
| ISO 7637-2 compliance | Validated for Load Dump Pulse 5a/b per ISO 7637-2:2011 and ISO 16750-2:2012 |
| Green construction | Halogen- and antimony-free molding compound (≤900 ppm Br/Cl, ≤1000 ppm Sb) |
Applications
| Engine Control Unit Protection | Body Control Module Protection |
|---|---|
Use Scenario: Protects microcontroller power rails and sensor interfaces in engine control units exposed to alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between battery rail and downstream DC/DC converter input. Use Value: Limits transient voltage to ≤38.9 V during 6600 W surges, preventing latch-up or damage to 3.3 V/5 V logic supplies. | Use Scenario: Shields LIN bus transceivers and LED driver ICs in body control modules from battery line transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply input, upstream of local regulators. Use Value: Maintains <10 μA leakage at 24 V, minimizing quiescent current in always-on vehicle domains. |
| ADAS Camera Power Input | Electric Power Steering ECU |
Use Scenario: Safeguards image sensor and ISP power inputs in automotive camera modules subjected to cold-crank and load dump. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 5 V or 3.3 V camera module input, co-located with bulk capacitance. Use Value: Delivers 170 A peak current handling with 38.9 V clamping, preserving signal integrity during fast-rising transients. | Use Scenario: Protects motor gate drivers and position sensor interfaces in EPS ECUs operating near engine compartment temperatures. IC Role / Device Role / Timing Role: High-power transient suppressor on 12 V auxiliary rail feeding H-bridge controllers. Use Value: Supports continuous operation at +175°C junction temperature, enabling compact heatsink-less designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), smaller SMA package, 38.9 V clamping at 10.3 A (not 170 A) | Not suitable for full-load-dump energy absorption; limited to lower-energy transients | Select only for cost-sensitive non-automotive or low-energy subsystems |
| SMCJ24A | PPPM = 1500 W, DO-214AB package, 38.9 V clamping at 38.9 A | Insufficient for 6600 W ISO 7637-2 Pulse 5; requires parallel devices for equivalent energy handling | Use only when board space allows multiple devices or when derated for less severe environments |
Compared with SMAJ24A and SMCJ24A, ALS8W24A delivers 4.4× and 4.4× higher peak pulse power respectively, enabling single-device compliance with full automotive load dump requirements without paralleling or thermal derating compromises.
Availability
ALS8W24A is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering ECUs requiring stable component supply with AEC-Q101 qualification and ISO 7637-2 compliance.
Supply support for ALS8W24A 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 ALS8WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for robust load dump protection in 12 V and 24 V vehicle electrical systems with stringent thermal and surge endurance requirements.
FAQ
What is the polarity configuration of ALS8W24A?
ALS8W24A is a unidirectional TVS diode with the heatsink tab serving as the anode and the bar-marked lead as the cathode. This configuration ensures forward conduction during positive transients on the cathode side, making it suitable for battery-rail clamping where the protected circuit is referenced to ground.
Does ALS8W24A meet AEC-Q101 stress test requirements?
Yes - ALS8W24A is AEC-Q101 qualified per Diodes Incorporated's product definitions. It undergoes stress testing including high-temperature reverse bias, temperature cycling, and humidity bias life testing, and is manufactured in IATF 16949 certified facilities with PPAP capability for automotive production programs.
How does the DO-218 package improve thermal performance versus SMA or SMC packages?
The DO-218 package integrates a large metal heatsink tab directly connected to the anode, enabling low thermal resistance to PCB copper. Unlike SMA (SOD-123) or SMC (DO-214AB), DO-218 supports >700 A IFSM and sustained 6600 W surge dissipation without external heatsinking, verified by transient thermal impedance curves in DS43856 Rev. 9.
Can ALS8W24A be used in 24 V commercial vehicle systems?
Yes - with VWM = 24.0 V and VBR starting at 26.7 V, ALS8W24A is explicitly rated for 24 V nominal systems. Its 38.9 V clamping voltage and +175°C TJ rating make it appropriate for heavy-duty truck and bus ECUs where higher baseline voltages and ambient temperatures apply.
ALS8W24A 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):
- 170A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
ALS8W24A FAQ
1.How can I place an order for ALS8W24A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W24A 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 ALS8W24A reliable?
The price and inventory of ALS8W24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W24A is usually 5 days.
3.What payment methods are accepted for ALS8W24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W24A?
ALS8W24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W24A 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 ALS8W24A?
For technical support, including ALS8W24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W24A requirements.
6.How does Aetrix verify that ALS8W24A is sourced from the original manufacturer or authorized distributors?
All ALS8W24A 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 ALS8W24A meets industry standards.
7.What is the process for return or replacement of ALS8W24A?
All ALS8W24A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W24A, 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 ALS8W24A part is unused and in its original packaging.
Return procedure for ALS8W24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W24A Tags
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