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Diodes Incorporated ALS5W17A
- Part No.:
- ALS5W17A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W17A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
ALS5W17A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 17.0 V stand-off voltage, 18.9–20.9 V breakdown voltage at 5 mA, 27.6 V clamping voltage at 130 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It serves as a clamping diode for automotive ECU modules to protect sensitive electronics against ISO 7637-2/16750-2 load dump transients.
For engineers reviewing the ALS5W17A datasheet, ALS5W17A pinout, ALS5W17A application, or ALS5W17A equivalent, key selection criteria include unidirectional clamping behavior, 175 °C maximum junction temperature, AEC-Q101 qualification, DO-218 mechanical outline compliance, and 260 °C soldering tolerance - all critical for under-hood automotive power rail protection.
Technical Context
The ALS5W17A operates as a unidirectional TVS diode with anode-connected heatsink configuration, enabling high-current surge conduction during positive-going load dump events. Its low thermal resistance and high forward surge capability (500 A IFSM) support robust energy absorption without thermal runaway.
It meets ISO 7637-2 Pulse 5a/b and ISO 16750-2 load dump test profiles under defined test conditions, with clamping performance validated across -55 °C to +175 °C operating range. The device exhibits <10 µA reverse leakage at VWM and maintains stable VBR over temperature due to excellent high-temperature stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.0 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 18.9 V / 20.9 V at 5 mA - Confirmed breakdown threshold ensures reliable turn-on during transients |
| VC @ IPPM | 27.6 V at 130 A (10/1000 µs) - Clamping voltage limits downstream IC stress during worst-case surge |
| PPPM (10/1000 µs) | 3600 W - Peak power handling capacity for short-duration automotive load dump events |
| IFSM | 500 A (8.3 ms half-sine) - Forward surge rating supports repeated high-energy switching events |
| TJ Range | -55 °C to +175 °C - Full automotive under-hood temperature coverage without derating loss |
| RoHS & Green | Lead-free, halogen- and antimony-free per EU RoHS 3 and Diodes' "Green" definition - compliant for global automotive supply chains |
Pinout & Package
DO-218 plastic package with integrated heatsink terminal; polarity marked by cathode bar; heatsink terminal functions as anode connection point. Device uses matte tin-plated terminals, solderable per MIL-STD-750 Method 2026 and J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Main current-carrying terminal during clamping | Electrically connected to metal heatsink base - must be mounted to PCB copper pour for thermal and electrical performance |
| Cathode (Bar-marked lead) | Clamping output node | Connected to protected circuit rail; conducts surge current to anode/heatsink when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables precise overvoltage protection on positive-rail systems without reverse conduction interference |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance |
| DO-218 thermal design | Low RθJC enables 3600 W pulse dissipation with minimal case temperature rise during load dump |
| ISO 7637-2/16750-2 compliance | Tested to meet automotive transient immunity requirements for ECU power inputs |
| MSL Level 1 rating | Zero moisture sensitivity - safe for standard reflow without baking or special handling |
Applications
| Automotive Engine Control Unit (ECU) Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller and CAN transceiver power rails in gasoline/diesel engine ECUs exposed to alternator load dump surges up to 120 V. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤27.6 V at 130 A, preventing latch-up or damage to 3.3 V/5 V logic supplies downstream. | Use Scenario: Shields constant-current LED driver ICs and MOSFET switches in adaptive front-lighting systems (AFS) from load dump during headlamp on/off cycling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input rail upstream of buck controller and gate drivers. Use Value: Absorbs 3600 W peak energy within 1 ms, maintaining LED driver functionality without shutdown or reset. |
| Body Control Module (BCM) Power Input | Start-Stop System Battery Interface |
Use Scenario: Safeguards LIN bus transceivers, relay drivers, and sensor interfaces in BCMs subjected to repeated cold-crank and load dump events. IC Role / Device Role / Timing Role: Standoff-clamp TVS on fused 12 V main input, directly bonded to heatsink pad. Use Value: Withstands 500 A surge current and operates reliably at 175 °C ambient, ensuring long-term field durability. | Use Scenario: Protects bidirectional DC/DC converters and supercapacitor charge controllers in 12 V start-stop systems during alternator re-engagement surges. IC Role / Device Role / Timing Role: High-power clamping element on battery-side input of start-stop power management IC. Use Value: Maintains <10 µA leakage at 17 V, minimizing quiescent current drain during vehicle sleep mode. |
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 |
|---|---|---|---|
| SMAJ17A | Lower PPPM (400 W), SMA package, 200 °C max TJ, no AEC-Q101 qualification | Not suitable for under-hood automotive use; limited to industrial or consumer-grade 12 V systems | Select only if cost-sensitive non-automotive designs require basic clamping without thermal or qualification demands |
| SMCJ17A | Higher PPPM (1500 W), SMC package, 175 °C TJ, AEC-Q101 qualified but lower surge rating than ALS5W17A | Acceptable for less severe load dump profiles (e.g., ISO 7637-2 Pulse 5a only), not full Pulse 5b | Choose when board space allows larger SMC footprint and system surge energy is capped below 1500 W |
Compared with SMAJ17A and SMCJ17A, ALS5W17A delivers 2.4× higher peak power handling and DO-218 thermal integration - essential for modern high-power automotive ECUs where compact size and under-hood temperature margins are critical.
Availability
ALS5W17A is available at Aetrix Electronics and suitable for automotive engine control units, LED headlamp drivers, body control modules, and start-stop system battery interfaces requiring stable component supply across extended production lifecycles.
Supply support for ALS5W17A 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 ALS5WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for high-energy load dump suppression in next-generation 12 V vehicle electrical architectures.
FAQ
What is the maximum clamping voltage of ALS5W17A under standard test conditions?
The ALS5W17A clamps to 27.6 V at 130 A peak pulse current using the 10/1000 µs waveform. This value is measured at 25 °C and remains stable across its full operating temperature range (-55 °C to +175 °C), verified per Diodes' characterization data and ISO 16750-2 test methodology.
Is ALS5W17A compatible with lead-free reflow processes?
Yes - ALS5W17A features a matte tin-plated termination rated for peak reflow temperatures up to 260 °C for 10 seconds, meeting J-STD-020 MSL Level 1 requirements. No pre-baking is required, and it complies with RoHS 3 and Diodes' "Green" material specifications.
How does the DO-218 package improve thermal performance versus SMC or SMA packages?
The DO-218's integrated metal heatsink terminal provides direct thermal path to PCB copper, achieving lower junction-to-case resistance. This enables sustained 3600 W pulse dissipation without exceeding 175 °C junction temperature - a 2.4× improvement over SMCJ17A's 1500 W rating in comparable thermal environments.
Can ALS5W17A be used in bidirectional transient protection circuits?
No - ALS5W17A is strictly unidirectional. Its anode-heatsink construction and electrical characteristics are optimized for positive-rail clamping only. For bidirectional protection, Diodes offers complementary series such as the D3V3M1U or SP1003 series, which feature symmetrical breakdown and clamping in both polarities.
ALS5W17A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 130A
- 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
ALS5W17A FAQ
1.How can I place an order for ALS5W17A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W17A 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 ALS5W17A reliable?
The price and inventory of ALS5W17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W17A is usually 5 days.
3.What payment methods are accepted for ALS5W17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W17A?
ALS5W17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W17A 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 ALS5W17A?
For technical support, including ALS5W17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W17A requirements.
6.How does Aetrix verify that ALS5W17A is sourced from the original manufacturer or authorized distributors?
All ALS5W17A 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 ALS5W17A meets industry standards.
7.What is the process for return or replacement of ALS5W17A?
All ALS5W17A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W17A, 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 ALS5W17A part is unused and in its original packaging.
Return procedure for ALS5W17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W17A Tags
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