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Diodes Incorporated ALS5W22A
- Part No.:
- ALS5W22A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W22A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,368
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Product details
Overview
ALS5W22A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor diode in DO-218 package, rated for 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown (VBR), 35.5 V clamping voltage (VC) at 101 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It serves as a clamping diode for automotive ECU load dump protection.
For engineers reviewing the ALS5W22A datasheet, ALS5W22A pinout, ALS5W22A application, or ALS5W22A equivalent, key selection criteria include its AEC-Q101 qualification, ISO7637-2/ISO16750-2 compliance, 175 °C maximum junction temperature, unidirectional polarity with heatsink-anode configuration, and DO-218 mechanical outline compatibility with high-temperature reflow (260 °C/10 s).
Technical Context
This device operates as a unidirectional TVS diode optimized for automotive load dump transients-clamping inductive energy spikes from alternator regulation failure. Its low thermal resistance and high surge capability (500 A IFSM, 8.3 ms half-sine) enable robust protection without thermal runaway under repeated stress.
The DO-218 package integrates a heatsink-anode terminal to maximize heat dissipation during high-power clamping events. Electrical behavior follows standard avalanche breakdown characteristics with tight VBR tolerance (±5%), low leakage (<10 µA at VWM), and stable performance up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum reverse operating voltage before clamping begins; defines safe DC blocking range in automotive 24 V systems. |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown voltage range at 5 mA test current; ensures reliable turn-on during load dump surges above nominal bus voltage. |
| VC @ IPPM | 35.5 V at 101 A - Clamping voltage under 10/1000 µs waveform; limits downstream voltage stress to ≤35.5 V during worst-case transients. |
| PPPM (10/1000 µs) | 3600 W - Peak pulse power handling; supports high-energy load dump events per ISO7637-2 Pulse 5a/b without degradation. |
| IFSM | 500 A - Surge current rating for 8.3 ms half-sine wave; validates robustness against repetitive inrush and switching surges. |
| TJ Range | −55 °C to +175 °C - Operating junction temperature range; enables deployment in engine bay and powertrain control modules. |
| Leakage @ VWM | <10 µA at 25 °C - Low reverse leakage preserves system efficiency and prevents battery drain in always-on automotive circuits. |
Pinout & Package
DO-218 plastic package with heatsink-anode terminal configuration. Anode is electrically connected to the metal heatsink tab; cathode marked by bar on molded body. Designed for surface-mount assembly with 260 °C/10 s soldering tolerance and MSL Level 1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Power input / clamping return path | Electrically active anode terminal integrated into large-area metal tab for direct PCB thermal coupling and low RθJC. |
| Cathode (Top Surface Pad) | Clamping output / protected circuit connection | Surface-mount pad opposite heatsink; connects to protected line (e.g., ECU power rail) to divert surge current to ground/anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use with temperature cycling, HTRB, and surge endurance testing per stress requirements. |
| ISO7637-2 & ISO16750-2 compliant | Meets Pulse 5a (load dump) and Pulse 5b (superimposed ripple) test profiles for 24 V vehicle systems. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage margin between operating and clamping thresholds-critical for protecting 30 V-rated ICs in modern ECUs. |
| High-temperature stability (TJ = 175 °C) | Enables placement near heat sources (e.g., power MOSFETs, DC-DC converters) without derating or thermal shutdown. |
| Lead-free, halogen-free, RoHS 3 compliant | Meets EU Directive 2015/863/EU with Br+Cl <1500 ppm and Sb <1000 ppm-supports green manufacturing and end-of-life recycling. |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and analog sensors in gasoline/diesel engine ECUs from alternator load dump surges during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and local regulator input to shunt transient energy to chassis ground. Use Value: Limits voltage excursion to ≤35.5 V during 3600 W pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and 24 V analog front-ends. | Use Scenario: Shields BCM power distribution ICs and LIN transceivers from load dump events induced by headlight or HVAC motor switching in 24 V architectures. IC Role / Device Role / Timing Role: Primary transient suppressor on main 24 V input rail upstream of buck converters and load switches. Use Value: Maintains <10 µA leakage at 22 V to avoid standby current violations while delivering 101 A clamping current within 1 ns response time. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Safeguards image sensor interface and ISP power supplies in rear-view or surround-view cameras exposed to harsh vehicle electrical environments. IC Role / Device Role / Timing Role: Secondary protection device after primary fuse and upstream TVS, placed adjacent to camera module's DC-DC input stage. Use Value: Withstands 175 °C junction temperature and maintains clamping performance across −40 °C to +125 °C ambient-ensuring reliability in sealed, non-ventilated housings. | Use Scenario: Protects torque sensor signal conditioning, motor gate drivers, and MCU power rails in EPS units subjected to repeated load dump and jump-start conditions. IC Role / Device Role / Timing Role: High-current clamping element mounted directly to aluminum heatsink on EPS PCB to manage 500 A surge currents. Use Value: Achieves <2.0 V forward voltage at 100 A (8.3 ms), minimizing conduction loss during sustained clamping and reducing thermal stress on adjacent components. |
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 |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400 W), SMA package, 22 V VWM, 35.5 V VC @ 11.3 A | Not suitable for ISO7637-2 Pulse 5; limited to low-energy transients in non-automotive or 12 V systems. | Select only for cost-sensitive, non-automotive 24 V applications where peak surge energy is <500 W. |
| SMCJ22A | Higher PPPM (1500 W), SMC package, same VWM/VC, but lower IFSM (200 A) | Passes ISO7637-2 Pulse 5a at reduced amplitude; insufficient for full-spec 24 V load dump in heavy-duty vehicles. | Acceptable for light commercial vehicle ECUs with derated test levels, but not for OEM-grade 24 V truck/bus systems. |
Compared with SMAJ22A and SMCJ22A, ALS5W22A delivers 2.4× higher peak power (3600 W vs. 1500 W) and 2.5× higher surge current (500 A vs. 200 A), enabling single-device compliance with full ISO7637-2 Pulse 5 without parallel staging or external heatsinking.
Availability
ALS5W22A is available at Aetrix Electronics and suitable for automotive ECU protection, body control module power rail hardening, ADAS camera power integrity, and electric power steering unit surge suppression requiring stable component supply across extended production lifecycles.
Supply support for ALS5W22A 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 diode product line, engineered specifically for high-energy load dump protection in 24 V vehicle systems-prioritizing thermal robustness, AEC-Q101 reliability, and ISO-compliant transient immunity.
FAQ
What is the polarity configuration of ALS5W22A and how does it affect PCB layout?
ALS5W22A is unidirectional with the heatsink tab serving as the anode terminal and the top surface pad as the cathode. This requires routing the anode to chassis ground or low-impedance return path, and connecting the cathode to the protected 24 V rail. The heatsink-anode design mandates direct thermal coupling to a copper pour or metal core layer for effective heat dissipation during clamping events.
Does ALS5W22A meet ISO7637-2 Pulse 5a requirements for 24 V systems?
Yes-ALS5W22A is explicitly validated for ISO7637-2 Pulse 5a (load dump) and Pulse 5b (superimposed ripple) in 24 V automotive applications. Its 3600 W peak pulse power (10/1000 µs), 101 A clamping current, and 35.5 V clamping voltage ensure compliance with the 120 V/100 ms test profile when used with appropriate PCB layout and grounding.
How does the DO-218 package improve thermal performance compared to SMA or SMC packages?
The DO-218 package features an integrated metal heatsink tab that provides direct thermal conduction from the silicon die to the PCB, achieving significantly lower junction-to-case thermal resistance (RθJC). This allows sustained operation at 175 °C junction temperature and supports repeated 500 A surge events without thermal runaway-unattainable with standard SMA/SMC plastic packages lacking metal thermal paths.
Can ALS5W22A be used in parallel to increase surge current handling?
No-ALS5W22A is not designed for parallel operation due to inherent VBR mismatch (24.4–26.9 V) between units, which causes current imbalance and potential thermal runaway. For higher current requirements, Diodes recommends using a single higher-rated device (e.g., ALS5W30A or ALS5W33A) or verifying layout-based current sharing with matched devices and identical trace lengths per manufacturer guidance.
ALS5W22A 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 101A
- 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
ALS5W22A FAQ
1.How can I place an order for ALS5W22A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W22A 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 ALS5W22A reliable?
The price and inventory of ALS5W22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W22A is usually 5 days.
3.What payment methods are accepted for ALS5W22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W22A?
ALS5W22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W22A 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 ALS5W22A?
For technical support, including ALS5W22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W22A requirements.
6.How does Aetrix verify that ALS5W22A is sourced from the original manufacturer or authorized distributors?
All ALS5W22A 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 ALS5W22A meets industry standards.
7.What is the process for return or replacement of ALS5W22A?
All ALS5W22A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W22A, 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 ALS5W22A part is unused and in its original packaging.
Return procedure for ALS5W22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W22A Tags
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