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Diodes Incorporated ALS6W14A
- Part No.:
- ALS6W14A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W14A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,200
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Product details
Overview
ALS6W14A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 14.0 V standoff voltage, 15.6–17.2 V breakdown voltage, and 4600 W peak pulse power (10/1000 µs). It serves as a clamping diode in automotive ECU modules to protect sensitive electronics against ISO7637-2/ISO16750-2 load dump transients.
For engineers reviewing the ALS6W14A datasheet, ALS6W14A pinout, ALS6W14A application, or ALS6W14A equivalent, key selection criteria include clamping voltage (23.2 V at 198 A), unidirectional polarity with heatsink-anode configuration, AEC-Q101 qualification, and DO-218 thermal performance under high-temperature automotive operating conditions (−55 °C to +175 °C).
Technical Context
The ALS6W14A operates as a unidirectional TVS diode optimized for automotive load dump suppression, leveraging silicon avalanche structure to clamp transient overvoltages above its 14.0 V standoff level. Its 23.2 V clamping voltage at 198 A (10/1000 µs) ensures robust protection of downstream 12 V rail electronics during high-energy surges.
Thermal design is enabled by low thermal resistance and DO-218 package construction, supporting continuous operation up to +175 °C junction temperature. It meets MSL Level 1 per J-STD-020 and withstands 260 °C soldering for 10 seconds, confirming suitability for automated SMT assembly in automotive production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14.0 V - Maximum reverse operating voltage before conduction begins; defines safe DC/AC bias limit for 12 V automotive systems. |
| VBR (min/max) | 15.6 V / 17.2 V - Breakdown threshold range at 5 mA test current; ensures consistent turn-on across production lot and temperature. |
| VC @ IPPM | 23.2 V at 198 A - Clamping voltage during 10/1000 µs surge; limits protected circuit voltage to safe margin below 24 V system tolerance. |
| PPPM (10/1000 µs) | 4600 W - Peak pulse power handling; supports full ISO7637-2 Load Dump Test Pulse 5a (12 V system, 100 V, 400 ms). |
| IFSM | 600 A - Peak forward surge current (8.3 ms half-sine); enables survival of repetitive inrush or short-circuit events without degradation. |
| Junction Temp Range | −55 °C to +175 °C - Extended thermal envelope matching under-hood automotive environments and ECU module placement constraints. |
Pinout & Package
ALS6W14A uses the DO-218 plastic package with anode-connected heatsink tab and cathode bar marking. The device has two terminals: anode (heatsink) and cathode (lead). Polarity is unidirectional, with clamping action occurring only during positive transients on the cathode side relative to anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Power return path & thermal interface | Electrically connected to PCB copper pour for low-inductance grounding and heat dissipation; must be soldered to thermal pad. |
| Cathode (Lead) | Transient input node | Connected to protected 12 V supply rail; conducts surge current to anode during overvoltage events above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock testing per stress requirements. |
| DO-218 thermal performance | Enables >4 kW pulse power dissipation with <1.5 °C/W junction-to-case thermal resistance, critical for compact ECU layouts. |
| Low clamping voltage (23.2 V) | Provides 30% headroom below typical 32 V automotive max-rail spec, preventing latch-up or damage in downstream LDOs and MCUs. |
| ISO7637-2 & ISO16750-2 compliance | Guarantees pass/fail validation against standardized load dump waveforms used in OEM ECU certification protocols. |
Applications
| Automotive ECU Load Dump Protection | 12 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting engine control units during alternator field-cutoff transients generating up to 100 V, 400 ms pulses. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and ECU input filter stage. Use Value: Limits rail voltage to ≤23.2 V during 198 A surge, preserving MCU, CAN transceivers, and analog sensors without derating. | Use Scenario: Safeguarding infotainment head units and ADAS domain controllers against battery line transients during cold crank or jump-start. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input, upstream of DC-DC converters and PMICs. Use Value: Maintains stable 12 V rail integrity with <10 ns response time, avoiding brownout resets or EEPROM corruption. |
| LED Headlamp Driver Protection | Body Control Module (BCM) Input Stage |
Use Scenario: Shielding high-current LED driver ICs from inductive kickback when switching 10+ A loads in adaptive front lighting systems. IC Role / Device Role / Timing Role: Fast-response transient suppressor parallel to driver input, absorbing energy from relay or MOSFET turn-off spikes. Use Value: Prevents gate oxide damage in driver FETs and avoids false fault triggering due to >60 V spikes on 12 V supply. | Use Scenario: Securing BCM microcontroller inputs receiving signals from door modules, seat controls, and HVAC actuators. IC Role / Device Role / Timing Role: Secondary-level clamping device on internal 12 V distribution bus feeding multiple sub-modules. Use Value: Ensures functional safety integrity (ASIL-B compatible) by limiting transient coupling into communication interfaces and wake-up circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Lower PPPM (400 W), SMA package, 27.2 V clamping at 12.3 A | Not suitable for ISO7637-2 Pulse 5a; limited to low-energy transients in non-automotive or auxiliary circuits | Select only for cost-sensitive, non-AEC-Q101 applications with <500 W surge requirement. |
| SMCJ14A | Higher PPPM (1500 W), SMC package, 23.2 V clamping at 64.5 A | Fails ISO7637-2 Pulse 5a due to insufficient 4600 W rating; acceptable for Pulse 1/2/3b only | Use where board space allows larger SMC footprint and full load dump immunity is not required. |
Compared with SMAJ14A and SMCJ14A, ALS6W14A uniquely delivers automotive-grade 4600 W load dump immunity in a thermally optimized DO-218 package, enabling direct replacement of legacy TO-277 designs without thermal derating or layout redesign.
Availability
ALS6W14A is available at Aetrix Electronics and suitable for automotive ECU protection, LED headlamp driver safeguarding, body control module input conditioning, and 12 V power rail clamping requiring stable component supply across long-life vehicle programs.
Supply support for ALS6W14A 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 ALS6WxxA series belongs to Diodes' automotive-qualified TVS portfolio, engineered specifically for ISO7637-2/ISO16750-2 load dump suppression in engine control, lighting, and body electronics modules.
FAQ
What is the maximum clamping voltage of ALS6W14A and under what test condition?
The maximum clamping voltage is 23.2 V, measured at 198 A peak pulse current using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (−55 °C to +175 °C) and reflects worst-case conduction behavior during automotive load dump events.
Is ALS6W14A suitable for bidirectional transient suppression?
No - ALS6W14A is strictly unidirectional. Its anode-heatsink construction and electrical characteristics support clamping only for positive transients on the cathode terminal relative to anode. For bidirectional protection, a separate TVS array or back-to-back configuration is required.
How does the DO-218 package improve thermal performance versus SMA or SMC packages?
The DO-218 package features an integrated metal heatsink tab that provides direct thermal path to PCB copper, achieving <1.5 °C/W junction-to-board resistance. This enables sustained 4600 W pulse handling without external heatsinks - a 3× improvement over SMAJ and 2× over SMCJ equivalents at equivalent VWM.
Does ALS6W14A require derating at elevated ambient temperatures?
Yes - power derating is required above 25 °C case temperature, per Figure 1 in the datasheet. At 125 °C case temperature, maximum PPPM drops to ~2200 W (48% of rated 4600 W), necessitating thermal design validation for under-hood placements exceeding 85 °C ambient.
ALS6W14A 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 198A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
ALS6W14A FAQ
1.How can I place an order for ALS6W14A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W14A 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 ALS6W14A reliable?
The price and inventory of ALS6W14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W14A is usually 5 days.
3.What payment methods are accepted for ALS6W14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W14A?
ALS6W14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W14A 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 ALS6W14A?
For technical support, including ALS6W14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W14A requirements.
6.How does Aetrix verify that ALS6W14A is sourced from the original manufacturer or authorized distributors?
All ALS6W14A 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 ALS6W14A meets industry standards.
7.What is the process for return or replacement of ALS6W14A?
All ALS6W14A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W14A, 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 ALS6W14A part is unused and in its original packaging.
Return procedure for ALS6W14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W14A Tags
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