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Diodes Incorporated ALS5W36A
- Part No.:
- ALS5W36A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W36A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,640
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Product details
Overview
ALS5W36A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 36 V standoff voltage (VWM), 40.0–44.2 V breakdown (VBR), 3600 W peak pulse power (10/1000 µs), and 500 A forward surge current-designed specifically for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS5W36A datasheet, ALS5W36A pinout, ALS5W36A application, or ALS5W36A equivalent, key selection criteria include clamping voltage (58.1 V at 62 A), thermal stability up to +175 °C junction temperature, unidirectional polarity with heatsink-anode configuration, and AEC-Q101 qualification for under-hood automotive environments.
Technical Context
This TVS diode operates as a clamping device in automotive power rails, activated only during overvoltage events exceeding its 36 V stand-off threshold. Its low 58.1 V clamping voltage at 62 A ensures downstream electronics remain within safe operating limits during 10/1000 µs load dump surges.
The DO-218 package provides low thermal resistance and high power dissipation capability, enabling stable operation at case temperatures up to +175 °C. Its unidirectional structure and heatsink-anode polarity require correct PCB layout alignment to maintain effective thermal path and surge conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| VBR (min/max) | 40.0–44.2 V at 5.0 mA - Confirmed breakdown onset range defining turn-on threshold |
| VC @ IPPM | 58.1 V at 62 A - Clamping voltage limiting downstream IC stress during 10/1000 µs surge |
| PPPM (10/1000 µs) | 3600 W - Peak transient energy absorption capacity without failure |
| IFSM | 500 A - Single half-sine surge current rating (8.3 ms), critical for load dump survival |
| Junction Temp Range | −55 °C to +175 °C - Validated operating envelope for engine bay placement |
| AEC-Q101 Qualified | Yes - Certified for automotive-grade reliability per stress test requirements |
Pinout & Package
DO-218 plastic package with integral metal heatsink acting as anode terminal; cathode identified by molded band. Matte tin-plated terminals meet MIL-STD-750 Method 2026 and JESD22-B102 solderability standards. Polarity is fixed: heatsink = anode, banded end = cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Heatsink (Anode) | Anode connection / thermal path | Primary current entry point and main thermal conduction interface to PCB copper pour |
| Cathode Band | Cathode connection | Marked terminal where transient current exits into protected circuit ground rail |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature stability | Rated for continuous operation up to +175 °C junction temperature, validated per AEC-Q101 |
| Low clamping voltage | 58.1 V at 62 A ensures protected microcontrollers and sensors stay below 60 V absolute max rating |
| Automotive compliance | Fully meets ISO 7637-2 and ISO 16750-2 load dump test requirements across defined test conditions |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb) |
| Robust surge handling | 500 A IFSM supports repeated 8.3 ms half-sine surges without degradation |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protecting 32-bit MCU and CAN transceivers in modern gasoline/diesel ECUs exposed to alternator load dump events. IC Role / Device Role / Timing Role: Clamping diode placed between battery rail and local DC/DC input, conducting only during >36 V transients. Use Value: Limits voltage seen by downstream regulators to ≤58.1 V, preventing latch-up or gate oxide damage in 40 V-rated power stages. | Use Scenario: Safeguarding buck-boost LED drivers powering adaptive front lighting systems (AFS) in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS connected across input capacitor to clamp 12 V rail surges induced by relay switching or alternator regulation faults. Use Value: Enables reliable operation at 175 °C ambient via low thermal resistance DO-218 package, avoiding thermal runaway during sustained load dump exposure. |
| Body Control Module (BCM) | Start-Stop System Power Rail |
Use Scenario: Securing LIN bus transceivers and motor drivers in BCMs managing door locks, windows, and interior lighting. IC Role / Device Role / Timing Role: Standoff-rated clamping device on 12 V supply line, responding within nanoseconds to inductive kickback from solenoid loads. Use Value: Maintains <10 µA leakage at 36 V, minimizing quiescent current drain critical for low-power sleep modes. | Use Scenario: Protecting bidirectional DC/DC converters and supercapacitor charging circuits in 12 V start-stop systems. IC Role / Device Role / Timing Role: High-energy TVS absorbing repetitive 3600 W pulses during engine restart cycles with rapid alternator re-engagement. Use Value: Withstands ≥1000 load dump events without parameter shift, verified per AEC-Q101 endurance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Lower PPPM (400 W), SMA package, 64.5 V clamping at 6.4 A | Not suitable for full ISO 7637-2 load dump; limited to lower-energy transients | Select only for non-critical 12 V subsystems with <100 A surge exposure |
| SMCJ36A | Higher PPPM (1500 W), SMC package, 58.1 V clamping at 25.8 A | Lacks AEC-Q101 qualification and 175 °C rating; not validated for under-hood use | Acceptable for industrial control panels but not automotive power modules requiring PPAP support |
Compared with SMAJ36A and SMCJ36A, ALS5W36A delivers 2.4× higher surge energy handling than SMCJ36A and full AEC-Q101 validation-making it the only option qualified for direct integration into production automotive ECU power inputs.
Availability
ALS5W36A is available at Aetrix Electronics and suitable for automotive engine control units, LED headlamp drivers, body control modules, and start-stop system power rails requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for ALS5W36A 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-qualified TVS portfolio, engineered specifically for robust load dump protection in harsh under-hood environments where high-temperature stability and repeatable surge immunity are mandatory.
FAQ
What is the maximum clamping voltage of ALS5W36A under standard test conditions?
The maximum clamping voltage (VC) is 58.1 V at 62 A peak pulse current using a 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case load dump events.
Is ALS5W36A suitable for bidirectional transient suppression?
No-ALS5W36A is a unidirectional TVS diode with heatsink-anode polarity. It conducts only during positive overvoltage events on the anode relative to cathode. For bidirectional protection (e.g., data lines), a symmetric TVS like D3V3F4U must be used instead.
Does ALS5W36A require derating at elevated ambient temperatures?
Yes-power dissipation must be derated linearly above +25 °C ambient, per the published power derating curve. At +125 °C case temperature, maximum PPPM drops to ~2200 W for 10/1000 µs waveforms, reflecting thermal limitations of the DO-218 package.
Can ALS5W36A be mounted directly to a heatsink?
Yes-the metal heatsink tab is electrically the anode and thermally optimized for direct mounting to a PCB copper pour or external heatsink. Thermal interface material is not required, but solder coverage ≥90% of the tab area is recommended for optimal heat transfer and mechanical reliability.
ALS5W36A 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 62A
- 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
ALS5W36A FAQ
1.How can I place an order for ALS5W36A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W36A 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 ALS5W36A reliable?
The price and inventory of ALS5W36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W36A is usually 5 days.
3.What payment methods are accepted for ALS5W36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W36A?
ALS5W36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W36A 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 ALS5W36A?
For technical support, including ALS5W36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W36A requirements.
6.How does Aetrix verify that ALS5W36A is sourced from the original manufacturer or authorized distributors?
All ALS5W36A 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 ALS5W36A meets industry standards.
7.What is the process for return or replacement of ALS5W36A?
All ALS5W36A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W36A, 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 ALS5W36A part is unused and in its original packaging.
Return procedure for ALS5W36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W36A Tags
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