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Diodes Incorporated ALS5W33A
- Part No.:
- ALS5W33A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W33A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,779
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Product details
Overview
ALS5W33A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor diode in DO-218 package, rated for 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown (VBR), 3600 W peak pulse power (10/1000 µs), and 500 A forward surge current (IFSM), designed specifically for automotive ECU load dump protection.
For engineers reviewing the ALS5W33A datasheet, ALS5W33A pinout, ALS5W33A application, or ALS5W33A equivalent, key selection criteria include clamping voltage (53.3 V at IPPM), thermal stability up to +175 °C junction temperature, AEC-Q101 qualification, ISO7637-2/ISO16750-2 compliance, and DO-218 mechanical robustness for high-reliability under-hood environments.
Technical Context
This TVS diode operates as a unidirectional clamping device with anode-connected heatsink configuration, enabling efficient thermal dissipation during high-energy transients. Its 3600 W peak pulse rating (10/1000 µs) and 2800 W rating (10/10,000 µs) support extended load dump waveforms per ISO16750-2.
Designed for automotive-grade reliability, it features low thermal resistance, <10 µA reverse leakage at 33 V and 25 °C, and maintains stable clamping performance across –55 °C to +175 °C operating junction range - critical for engine compartment electronics exposed to rapid thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse voltage before clamping onset; defines system operating margin below breakdown. |
| VBR (min/max) | 36.7 V / 40.6 V - Verified breakdown threshold at 5 mA; ensures predictable turn-on during transients. |
| VC @ IPPM | 53.3 V - Clamping voltage at 68 A peak pulse current; limits downstream IC stress during load dump events. |
| PPPM (10/1000 µs) | 3600 W - Peak power handling capability for standard ISO7637-2 Pulse 5a; determines survivability of short-duration surges. |
| IFSM | 500 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports high-current inductive kickback absorption. |
| TJ Range | –55 °C to +175 °C - Extended junction temperature range enables placement near heat sources in automotive ECUs. |
| Leakage @ VWM | ≤10 µA at 25 °C - Low reverse leakage preserves battery drain budget in always-on vehicle modules. |
Pinout & Package
DO-218 plastic package with integral heatsink terminal; polarity marked by cathode bar; heatsink serves as anode connection. Matte tin-plated terminals compliant with MIL-STD-750 Method 2026 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Main current path input / thermal interface | Electrically connected to heatsink; must be mounted to PCB copper pour for thermal management and electrical reference. |
| Cathode (Bar-marked lead) | Clamped output / transient return path | Connected to protected circuit rail; conducts surge current to ground or battery return during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per stress test requirements. |
| ISO7637-2 & ISO16750-2 compliant | Meets Pulse 5a (load dump) test profiles for 12 V and 24 V systems, ensuring immunity to real-world vehicle electrical disturbances. |
| Low clamping voltage (53.3 V) | Minimizes overvoltage exposure to downstream DC-DC converters, microcontrollers, and CAN transceivers in ECU designs. |
| MSL Level 1 (260 °C) | Enables standard SMT reflow without moisture-related popcorning; eliminates pre-bake requirement for production assembly. |
| Halogen- and antimony-free "Green" | Complies with EU RoHS 3 (2015/863/EU) and automotive environmental directives; supports sustainable supply chain goals. |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protecting 3.3 V/5 V microcontroller power domains from alternator-induced load dump transients during battery disconnect. IC Role / Device Role: Unidirectional clamping diode placed between battery rail and DC-DC input, shunting surge energy to chassis ground. Use Value: Limits rail voltage to ≤53.3 V, preventing latch-up or permanent damage to LDOs and PMICs downstream. | Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs against voltage spikes during headlight or fog lamp switching. IC Role / Device Role: Primary transient suppression on 12 V supply line feeding BCM sub-circuits. Use Value: Maintains signal integrity and prevents false resets by clamping transients before they propagate to sensitive analog/digital interfaces. |
| Transmission Control Module (TCM) | Advanced Driver Assistance Systems (ADAS) Camera ECU |
Use Scenario: Securing solenoid driver outputs and sensor supply rails in transmission control units exposed to high-temperature under-hood conditions. IC Role / Device Role: High-temperature-stable TVS on switched 12 V outputs driving torque converter solenoids. Use Value: Ensures reliable operation up to +175 °C junction temperature while sustaining 500 A surge capability during gear-shift inductive kicks. | Use Scenario: Protecting image sensor power and MIPI CSI-2 interface lines in front-facing ADAS cameras subjected to repeated ignition cycles. IC Role / Device Role: Front-end clamping device on main camera ECU power input, upstream of buck converters. Use Value: Prevents pixel corruption and frame loss by suppressing fast-rising transients (<100 ns rise time) before they couple into low-noise analog sensor paths. |
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 clamping same but lower surge current (32.4 A). | Not suitable for full ISO7637-2 Pulse 5a; limited to low-energy transients in non-automotive or auxiliary circuits. | Select only if system-level testing confirms 400 W suffices and thermal constraints allow smaller footprint. |
| SMCJ33A | Higher PPPM (1500 W), SMC package, 53.3 V clamping, 113 A IPPM - still below ALS5W33A's 68 A rating at same VC. | Acceptable for mid-tier automotive modules but fails full load dump margin in high-power ECUs (e.g., engine/transmission). | Prefer where board space allows SMC and cost sensitivity outweighs need for 3600 W robustness. |
Compared with SMAJ33A and SMCJ33A, ALS5W33A delivers 2.4× higher peak power and 2.1× higher surge current in the same clamping voltage class - making it the only DO-218 option qualified for full AEC-Q101 and ISO16750-2 load dump compliance in primary power domains.
Availability
ALS5W33A is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera ECUs requiring stable component supply with guaranteed long-term lifecycle support and PPAP documentation.
Supply support for ALS5W33A 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The ALS5WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for high-energy load dump suppression in 12 V and 24 V vehicle electrical systems - emphasizing thermal resilience, AEC-Q101 validation, and ISO standard conformance.
FAQ
What is the maximum clamping voltage of ALS5W33A at its rated peak pulse current?
The maximum clamping voltage (VC) of ALS5W33A is 53.3 V when subjected to its peak pulse current (IPPM) of 68 A under a 10/1000 µs waveform. This value is measured at 25 °C ambient and represents the upper bound of voltage seen by downstream components during worst-case load dump events.
Is ALS5W33A suitable for 24 V automotive systems?
Yes - ALS5W33A is rated for 33 V stand-off voltage and 53.3 V clamping, making it appropriate for 24 V nominal systems where load dump transients can exceed 40 V. Its 3600 W peak power rating and AEC-Q101 qualification confirm suitability for both 12 V and 24 V commercial and heavy-duty vehicle applications.
How does the DO-218 package improve thermal performance compared to SMA or SMC?
The DO-218 package integrates a large metal heatsink tab directly connected to the anode, reducing thermal resistance from junction-to-case (RθJC) and enabling sustained power dissipation at elevated temperatures. Unlike SMA/SMC, its heatsink is electrically active and must be soldered to a thermal pad, improving heat transfer by >40% in typical PCB layouts.
Does ALS5W33A require derating at high ambient temperatures?
Yes - its peak pulse power must be derated above 25 °C case temperature, following the published power derating curve. At 125 °C case temperature, maximum PPPM drops to ~2200 W (10/1000 µs), and at 175 °C, it falls to ~1300 W. Designers must verify thermal layout ensures case temperature remains within limits during worst-case transient repetition.
ALS5W33A 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):
- 68A
- 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
ALS5W33A FAQ
1.How can I place an order for ALS5W33A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W33A 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 ALS5W33A reliable?
The price and inventory of ALS5W33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W33A is usually 5 days.
3.What payment methods are accepted for ALS5W33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W33A?
ALS5W33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W33A 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 ALS5W33A?
For technical support, including ALS5W33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W33A requirements.
6.How does Aetrix verify that ALS5W33A is sourced from the original manufacturer or authorized distributors?
All ALS5W33A 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 ALS5W33A meets industry standards.
7.What is the process for return or replacement of ALS5W33A?
All ALS5W33A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W33A, 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 ALS5W33A part is unused and in its original packaging.
Return procedure for ALS5W33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W33A Tags
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