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Diodes Incorporated ALS5W24A
- Part No.:
- ALS5W24A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W24A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,635
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Product details
Overview
ALS5W24A 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), 3600 W peak pulse power (10/1000 µs), and 500 A forward surge current-designed specifically for automotive ECU load dump protection per ISO7637-2 and ISO16750-2.
For engineers reviewing the ALS5W24A datasheet, ALS5W24A pinout, ALS5W24A application, or ALS5W24A equivalent, key selection criteria include clamping voltage (38.9 V at 93 A), thermal stability up to +175 °C junction temperature, AEC-Q101 qualification, and DO-218 mechanical compatibility with high-power automotive PCB layouts.
Technical Context
The ALS5W24A operates as a unidirectional TVS diode optimized for high-energy automotive load dump transients. Its silicon avalanche structure delivers precise 24 V stand-off with low leakage (<10 µA at VWM) and stable clamping (38.9 V max at IPPM), maintaining performance across -55 °C to +175 °C operating range.
It meets ISO7637-2 Pulse 5a/b and ISO16750-2 load dump test conditions using 10 ms exponential waveforms, with derated power capability down to 2800 W at 10/10,000 µs and full 3600 W at 10/1000 µs-enabled by low thermal resistance and heatsink-anode construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum reverse voltage before conduction; defines system operating margin before clamping activation |
| VBR (min/max) | 26.7 V / 29.5 V - Breakdown threshold range at 5 mA; ensures reliable turn-on under worst-case tolerance |
| VC @ IPPM | 38.9 V - Clamping voltage at 93 A peak pulse; limits downstream IC stress during load dump events |
| PPPM (10/1000 µs) | 3600 W - Peak pulse power handling; sustains 10 ms automotive load dump surges without failure |
| IFSM | 500 A - 8.3 ms half-sine surge rating; supports high-current inrush during engine cranking or relay switching |
| TJ Range | -55 °C to +175 °C - Extended junction temperature range; enables under-hood placement near ECUs and power modules |
Pinout & Package
DO-218 plastic package with heatsink-anode polarity: anode terminal is electrically connected to the metal heatsink tab (case), cathode is marked by a bar on the molded body. Designed for surface-mount reflow with 260 °C/10 s soldering profile and MSL Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Power return path & thermal interface | Electrically active anode; must be soldered to large copper pour for thermal dissipation and low-inductance grounding |
| Cathode (Marked End) | Transient voltage sensing & clamping node | Connected to protected line (e.g., battery rail); conducts during overvoltage to shunt energy to anode/heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables DC-biased battery rail protection without reverse conduction losses during normal operation |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on downstream 24 V-rated components such as CAN transceivers and microcontrollers |
| DO-218 thermal design | Heatsink-anode construction achieves <1.5 °C/W junction-to-case thermal resistance for sustained 3600 W pulse handling |
| RoHS 3 & Halogen-free | Complies with EU Directive 2015/863/EU and Diodes' "Green" standard (<900 ppm Br/Cl, <1000 ppm Sb) |
Applications
| Automotive Engine Control Unit (ECU) Protection | Commercial Vehicle Battery Rail Clamping |
|---|---|
Use Scenario: Protects 24 V ECU power input against alternator load dump transients during ignition-off events in trucks and buses. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ECU input filter capacitor. Use Value: Limits clamped voltage to 38.9 V, ensuring survival of 40 V-rated DC-DC converters and MCU power supplies. | Use Scenario: Safeguards telematics and ADAS modules powered from 24 V chassis battery subject to ISO16750-2 Pulse 5b waveform. IC Role / Device Role / Timing Role: Primary clamping device on main power entry point, upstream of fuse and input filter. Use Value: Withstands 3600 W pulses while maintaining <10 µA leakage at 24 V, minimizing standby current drain. |
| Off-Highway Equipment Power Management | Industrial 24 V PLC I/O Module Protection |
Use Scenario: Shields hydraulic control electronics in excavators and harvesters exposed to severe load dump and cranking surges. IC Role / Device Role / Timing Role: High-surge TVS mounted directly on power entry PCB with thermal pad to internal ground plane. Use Value: Rated for +175 °C junction temperature, enabling reliable operation in sealed enclosures near diesel engines. | Use Scenario: Protects programmable logic controller digital I/O channels fed from shared 24 V supply bus. IC Role / Device Role / Timing Role: Distributed clamping device per I/O group to prevent cross-coupling of transients between modules. Use Value: Low 24 V stand-off allows coordination with upstream fuses and downstream TVS arrays without over-clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), SMA package, 38.9 V VC but only 27.8 V VBR min | Not suitable for ISO7637-2 Pulse 5; limited to low-energy surges in non-automotive 24 V systems | Select only for cost-sensitive industrial controls where 3600 W surge immunity is not required |
| SMCJ24A | Higher PPPM (3000 W), SMC package, 38.9 V VC, 26.7 V VBR min - same clamping but lower pulse rating than ALS5W24A | Meets ISO7637-2 Pulse 5a but not Pulse 5b; insufficient for heavy-duty commercial vehicle load dump | Acceptable for light-duty automotive applications where 3600 W headroom is not mandated |
Compared with SMAJ24A and SMCJ24A, the ALS5W24A delivers 20% higher peak pulse power and DO-218 thermal performance essential for sustained load dump events in modern 24 V commercial vehicles-making it the only option qualified for full ISO7637-2 Pulse 5b compliance at 10 ms duration.
Availability
ALS5W24A is available at Aetrix Electronics and suitable for automotive ECU protection, commercial vehicle battery rail clamping, and off-highway equipment power management requiring stable component supply and AEC-Q101-compliant transient suppression.
Supply support for ALS5W24A 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 protection, power management, and signal integrity solutions for automotive, industrial, and computing markets.
The ALS5W series belongs to Diodes' AEC-Q101-qualified automotive TVS portfolio, engineered specifically for high-energy load dump suppression in 24 V systems-prioritizing thermal robustness, low clamping ratio, and ISO-standard compliance over generic surge ratings.
FAQ
What is the maximum clamping voltage of ALS5W24A at its rated peak pulse current?
The ALS5W24A has a maximum clamping voltage (VC) of 38.9 V when subjected to its peak pulse current (IPPM) of 93 A under the 10/1000 µs waveform. This value is measured at TA = 25 °C and represents the upper limit of voltage seen by protected circuitry during worst-case load dump events.
Is ALS5W24A suitable for bidirectional transient protection?
No. ALS5W24A is a unidirectional TVS diode, with anode connected to the heatsink tab and cathode marked on the body. It conducts only during positive overvoltage on the cathode relative to anode. For bidirectional protection (e.g., data lines), a symmetric TVS array or separate back-to-back configuration is required.
How does the DO-218 package improve thermal performance over SMC or SMA packages?
The DO-218 package integrates the anode directly into a large metal heatsink tab, achieving significantly lower junction-to-case thermal resistance (<1.5 °C/W). This enables sustained 3600 W pulse dissipation without thermal runaway-unattainable with SMC (≈3.5 °C/W) or SMA (≈5.0 °C/W) packages under identical surge conditions.
Does ALS5W24A require external heat sinking beyond PCB copper?
Yes. While the DO-218 heatsink tab provides superior thermal conduction versus standard SMD packages, effective operation at full 3600 W requires ≥250 mm² of 2 oz copper connected to the anode tab, plus optional external heatsinking for repeated surge duty cycles. Thermal simulation per JEDEC JESD51-14 is recommended for high-frequency load dump scenarios.
ALS5W24A 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):
- 93A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
ALS5W24A FAQ
1.How can I place an order for ALS5W24A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W24A 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 ALS5W24A reliable?
The price and inventory of ALS5W24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W24A is usually 5 days.
3.What payment methods are accepted for ALS5W24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W24A?
ALS5W24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W24A 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 ALS5W24A?
For technical support, including ALS5W24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W24A requirements.
6.How does Aetrix verify that ALS5W24A is sourced from the original manufacturer or authorized distributors?
All ALS5W24A 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 ALS5W24A meets industry standards.
7.What is the process for return or replacement of ALS5W24A?
All ALS5W24A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W24A, 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 ALS5W24A part is unused and in its original packaging.
Return procedure for ALS5W24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W24A Tags
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