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Diodes Incorporated ALS5W43A
- Part No.:
- ALS5W43A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W43A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:6,070
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Product details
Overview
ALS5W43A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 43 V stand-off voltage (VWM), 52.8 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 ALS5W43A datasheet, ALS5W43A pinout, ALS5W43A application, or ALS5W43A equivalent, key selection criteria include clamping voltage (69.4 V at 52 A), thermal stability up to +175 °C junction temperature, AEC-Q101 qualification, and compliance with ISO7637-2 and ISO16750-2 surge test requirements.
Technical Context
This TVS diode operates in avalanche breakdown mode under transient overvoltage conditions, delivering precise clamping at 69.4 V when subjected to 52 A peak pulse current (10/1000 µs). Its unidirectional configuration enables robust reverse-biased protection of sensitive downstream electronics against inductive switching transients.
The DO-218 package provides low thermal resistance and high power dissipation capability, supporting stable operation across -55 °C to +175 °C junction temperature range. It meets MSL Level 1 per J-STD-020 and withstands 260 °C soldering for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 47.8 V / 52.8 V - Verified breakdown threshold at 5 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 69.4 V - Clamping voltage at 52 A peak pulse, limiting downstream voltage stress |
| PPPM (10/1000 µs) | 3600 W - Sustains high-energy automotive load dump surges without failure |
| IFSM | 500 A - Withstands 8.3 ms half-sine surge, critical for engine control module reliability |
| TJ Range | -55 °C to +175 °C - Enables deployment in under-hood automotive environments |
| Leakage @ VWM | 10 µA - Minimal standby power loss and signal integrity impact at rated voltage |
Pinout & Package
DO-218 plastic package with heatsink-connected anode terminal and cathode bar marking. Anode is electrically tied to the metal heat slug for low-inductance, high-current path routing and thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Input/Power Rail Connection | Low-impedance path to ground plane or chassis; serves as primary thermal interface and current entry point |
| Cathode (Bar-marked lead) | Clamped Output/Protected Side | Connected to protected circuit node; conducts surge current to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use with lifetime reliability under thermal cycling and humidity exposure |
| ISO7637-2 & ISO16750-2 compliant | Passes Pulse 5a (load dump) testing up to 40 V superimposed on 14 V supply, per automotive OEM requirements |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage margin between breakdown and clamping, improving system-level protection headroom |
| MSL Level 1 rating | Enables standard reflow assembly without moisture sensitivity concerns or baking preconditioning |
| Halogen- and antimony-free "Green" construction | Meets EU RoHS 3 (2015/863/EU) with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller I/O, CAN transceivers, and sensor interfaces in gasoline/diesel ECUs exposed to 12 V battery load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and protected IC power input, clamping transients within 1 ns response time. Use Value: Limits peak voltage to 69.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices downstream. | Use Scenario: Shields constant-current LED driver ICs and MOSFET switches in adaptive front-lighting systems (AFS) from alternator-induced surges. IC Role / Device Role / Timing Role: Mounted directly at DC/DC converter input, absorbing 3600 W pulses while maintaining <10 µA leakage at 43 V nominal. Use Value: Ensures uninterrupted illumination during cold cranking and load dump, avoiding flicker or shutdown due to overvoltage reset. |
| Body Control Module (BCM) Power Input | Electric Power Steering (EPS) ECU |
Use Scenario: Secures power management ICs and LIN transceivers in BCMs handling door locks, window lifts, and lighting control. IC Role / Device Role / Timing Role: Installed at 12 V input filter stage, shunting energy into chassis ground via heatsink-anode connection. Use Value: Maintains functional safety integrity by preventing false resets or brownouts during repeated 10/1000 µs surge events. | Use Scenario: Safeguards motor gate drivers and position sensor signal conditioning circuits in EPS systems subject to high-current inductive kickback. IC Role / Device Role / Timing Role: Positioned upstream of buck converter, providing fast-response clamping before voltage propagates to sensitive analog front-end. Use Value: Guarantees torque assist continuity by limiting transient overshoot to <70 V, well below 80 V absolute maximum ratings of common gate drivers. |
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 |
|---|---|---|---|
| SMAJ43A | Lower PPPM (400 W), SMA package, 73.5 V clamping at 5.9 A | Not suitable for full-load-dump duty; limited to lower-energy transients | Select only for non-automotive or low-power auxiliary circuits where 3600 W rating is unnecessary |
| SMCJ43A | Higher PPPM (3000 W), SMC package, 69.4 V clamping at 43.3 A | Lacks AEC-Q101 qualification and ISO7637-2 validation; not approved for production automotive | Acceptable for prototyping or industrial-grade designs but requires requalification for OEM vehicle programs |
Compared with SMAJ43A and SMCJ43A, ALS5W43A delivers certified automotive-grade surge immunity with 20% higher peak power handling, validated thermal performance to +175 °C, and direct heatsink integration-making it the only option qualified for series production in engine bay ECUs.
Availability
ALS5W43A is available at Aetrix Electronics and suitable for engine control units, LED headlamp drivers, body control modules, and electric power steering ECUs requiring stable component supply and long-term automotive lifecycle support.
Supply support for ALS5W43A 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 protection, power management, and signal integrity solutions for automotive, industrial, and computing markets.
The ALS5WxxA series is part of Diodes' Automotive TVS portfolio, engineered specifically to meet stringent OEM load dump surge requirements while enabling compact, thermally efficient PCB layouts in space-constrained ECU modules.
FAQ
What is the maximum clamping voltage of ALS5W43A under standard test conditions?
The maximum clamping voltage (VC) is 69.4 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 52 A. This value is measured at TA = 25 °C and reflects worst-case voltage seen by protected circuitry during a full automotive load dump event.
Is ALS5W43A suitable for bidirectional surge protection?
No, ALS5W43A is a unidirectional TVS diode optimized for reverse-biased protection of positive-rail electronics. It does not provide symmetrical clamping for AC or dual-polarity transients; bidirectional alternatives like the P6SMBJ43CA would be required for such use cases.
How does the DO-218 package improve thermal performance compared to SMA or SMC?
The DO-218's integrated metal heatsink anode reduces thermal resistance from junction to ambient by ~40% versus SMC packages and enables direct mounting to large copper areas. This allows sustained 3600 W pulse handling without exceeding +175 °C junction temperature, even at elevated case temperatures.
Does ALS5W43A require derating at high ambient temperatures?
Yes - power derating is required above 25 °C ambient. At 125 °C case temperature, maximum PPPM drops to ~1800 W (50% of rated 3600 W), as shown in Figure 1 of the datasheet. Designers must verify thermal layout ensures junction stays ≤ +175 °C under worst-case surge repetition and ambient conditions.
ALS5W43A 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 52A
- 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
ALS5W43A FAQ
1.How can I place an order for ALS5W43A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W43A 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 ALS5W43A reliable?
The price and inventory of ALS5W43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W43A is usually 5 days.
3.What payment methods are accepted for ALS5W43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W43A?
ALS5W43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W43A 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 ALS5W43A?
For technical support, including ALS5W43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W43A requirements.
6.How does Aetrix verify that ALS5W43A is sourced from the original manufacturer or authorized distributors?
All ALS5W43A 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 ALS5W43A meets industry standards.
7.What is the process for return or replacement of ALS5W43A?
All ALS5W43A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W43A, 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 ALS5W43A part is unused and in its original packaging.
Return procedure for ALS5W43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W43A Tags
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