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Diodes Incorporated ALS5W30A
- Part No.:
- ALS5W30A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W30A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,314
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Product details
Overview
ALS5W30A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor diode in DO-218 package, rated for 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown (VBR), 3600 W peak pulse power (10/1000 µs), and 500 A forward surge current (IFSM). It serves as a clamping diode for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS5W30A datasheet, ALS5W30A pinout, ALS5W30A application, or ALS5W30A equivalent, key selection criteria include its 30 V VWM, 48.4 V clamping voltage at 74 A, unidirectional polarity, DO-218 thermal performance, and AEC-Q101 qualification for under-hood automotive use.
Technical Context
This device operates as a unidirectional TVS diode optimized for high-energy automotive load dump suppression. Its silicon avalanche structure delivers precise clamping with low dynamic impedance, enabling fast response to 10 ms exponential load dump waveforms per ISO 16750-2.
Thermal design is enabled by low junction-to-case thermal resistance and DO-218 package heatsink integration (anode-connected case). It sustains operation from −55 °C to +175 °C junction temperature and meets MSL Level 1 with 260 °C soldering tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30.0 V - Maximum reverse operating voltage before clamping begins; sets system nominal bus voltage compatibility. |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown threshold range at 5 mA test current; defines clamping onset precision. |
| VC @ IPPM | 48.4 V - Clamping voltage at 74 A peak pulse current; determines maximum protected circuit stress during surge. |
| PPPM (10/1000 µs) | 3600 W - Peak pulse power handling; supports robust protection against ISO 7637-2 Test Pulse 5a. |
| IFSM | 500 A - 8.3 ms half-sine surge current rating; validates capability for repeated inductive turn-off events. |
| Junction Temp Range | −55 °C to +175 °C - Enables direct mounting on engine control unit heatsinks without derating. |
Pinout & Package
DO-218 plastic package with integrated heatsink anode terminal. Cathode identified by molded band. Anode (heatsink) must be electrically connected to system ground or chassis for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Power Input / Thermal Path | Primary current path during clamping; also serves as mechanical thermal interface to PCB copper pour or external heatsink. |
| Cathode (Banded End) | Clamped Output / Reference Node | Connected to protected circuit rail; voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control modules and body controllers. |
| ISO 7637-2 & ISO 16750-2 compliant | Meets Load Dump Pulse 5a requirements across full temperature range without external derating. |
| Low thermal resistance | Enables direct PCB mounting with minimal copper area while maintaining <175 °C junction temperature at full power. |
| Lead-free, halogen-free, RoHS 3 compliant | Complies with EU Directive 2015/863/EU and automotive supply chain sustainability mandates. |
| MSL Level 1 | Zero moisture sensitivity; no baking required prior to reflow, supporting standard SMT assembly flow. |
Applications
| Engine Control Unit Protection | Body Control Module Protection |
|---|---|
Use Scenario: Protects microcontroller power rails and CAN transceivers in gasoline/diesel ECUs exposed to alternator load dump surges during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and protected subsystem, conducting only during positive overvoltage events. Use Value: Limits transient voltage to ≤48.4 V at 74 A, preventing latch-up or damage to 3.3 V/5 V logic and 12 V analog front-ends. | Use Scenario: Shields lighting drivers, window motor controllers, and HVAC actuators in BCMs from load dump induced on shared 12 V distribution lines. IC Role / Device Role / Timing Role: High-current shunt element that diverts surge energy away from downstream FET drivers and MCU I/O pins. Use Value: Handles 500 A surge without failure, maintaining functional safety integrity during vehicle start-stop cycles. |
| ADAS Power Supply Protection | Electric Power Steering Protection |
Use Scenario: Safeguards radar sensor and camera module DC/DC converters in ADAS domain controllers subjected to load dump during battery regeneration events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input stage, activated within nanoseconds of surge onset. Use Value: Maintains <10 µA leakage at 30 V and stable clamping up to +175 °C, ensuring reliability in sealed, high-temp enclosures. | Use Scenario: Protects EPS motor gate drivers and position sensor interfaces from load dump transients generated by high-current steering actuation circuits. IC Role / Device Role / Timing Role: High-efficiency transient suppressor mounted directly to aluminum heatsink, minimizing thermal impedance. Use Value: Delivers 3600 W peak power dissipation with <2.0 V forward drop at 100 A, reducing conduction losses during sustained clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Lower PPPM (400 W), SMA package, 43.5 V clamping at 9.3 A | Not suitable for ISO 7637-2 Pulse 5a; limited to low-energy surges in non-automotive systems | Select only for cost-sensitive industrial controls where surge energy is <10% of ALS5W30A rating. |
| SMCJ30A | Higher VC (48.4 V same), but lower IFSM (100 A), SMC package | Lacks AEC-Q101 qualification and thermal robustness for under-hood mounting | Acceptable for cabin-mounted modules with active cooling, but not for engine bay deployment. |
Compared with SMAJ30A and SMCJ30A, ALS5W30A uniquely combines 3600 W pulse power, 500 A surge rating, AEC-Q101 qualification, and DO-218 heatsink integration-enabling single-device protection for full automotive load dump compliance without parallel devices or external heatsinking.
Availability
ALS5W30A is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS power supplies, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for ALS5W30A 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 ALS5W series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for ISO-compliant load dump protection in harsh environment ECUs and power modules.
FAQ
What is the maximum clamping voltage of ALS5W30A at rated peak pulse current?
The maximum clamping voltage (VC) is 48.4 V at 74 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per JEDEC standards and guarantees worst-case voltage seen by downstream circuitry during full-rated surge events.
Is ALS5W30A suitable for bidirectional transient suppression?
No. ALS5W30A is a unidirectional TVS diode with anode-heatsink polarity. It conducts only during positive overvoltage events relative to the anode. For bidirectional protection (e.g., data line ESD), a symmetric device such as P6SMB30CA is required.
How does the DO-218 package improve thermal performance over SMC or SMA packages?
The DO-218's integral metal heatsink tab provides direct thermal conduction from the die to PCB copper or external heatsinks, achieving significantly lower RθJC. At 175 °C junction temperature, it sustains 3600 W pulses without derating-unachievable with standard SMC/SMA packages due to higher thermal resistance.
Does ALS5W30A require derating at elevated ambient temperatures?
Yes. Per Figure 1 in the datasheet, power derating begins above 25 °C case temperature. At 125 °C case temperature, maximum PPPM drops to ~2200 W for 10/1000 µs waveform. Designers must size PCB copper area and airflow to maintain case temperature within limits for target surge duty cycle.
ALS5W30A 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 74A
- 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
ALS5W30A FAQ
1.How can I place an order for ALS5W30A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W30A 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 ALS5W30A reliable?
The price and inventory of ALS5W30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W30A is usually 5 days.
3.What payment methods are accepted for ALS5W30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W30A?
ALS5W30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W30A 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 ALS5W30A?
For technical support, including ALS5W30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W30A requirements.
6.How does Aetrix verify that ALS5W30A is sourced from the original manufacturer or authorized distributors?
All ALS5W30A 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 ALS5W30A meets industry standards.
7.What is the process for return or replacement of ALS5W30A?
All ALS5W30A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W30A, 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 ALS5W30A part is unused and in its original packaging.
Return procedure for ALS5W30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W30A Tags
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