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Diodes Incorporated ALS8W16A
- Part No.:
- ALS8W16A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W16A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,808
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Product details
Overview
ALS8W16A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 16 V stand-off voltage (VWM), 17.8–19.7 V breakdown (VBR), 6600 W peak pulse power (10/1000 μs), and 254 A peak pulse current, designed for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W16A datasheet, ALS8W16A pinout, ALS8W16A application, or ALS8W16A equivalent, key selection criteria include clamping voltage (26.0 V at IPPM), low thermal resistance, AEC-Q101 qualification readiness, high-temperature operation up to +175°C junction, and compliance with automotive surge standards under defined test conditions.
Technical Context
This TVS diode operates in avalanche mode during overvoltage events, delivering fast response (<1 ns) and stable clamping across temperature. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to PCB copper planes for enhanced thermal dissipation.
Designed specifically for 12 V automotive systems, it meets ISO 7637-2 Pulse 5a/b and ISO 16750-2 load dump requirements when tested with specified exponential waveforms and source impedances, supporting robust protection without external series impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16.0 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level DC bus tolerance margin. |
| VBR (min/max) | 17.8–19.7 V - Breakdown voltage range at 5 mA test current; ensures reliable turn-on above nominal bus voltage. |
| VC @ IPPM | 26.0 V - Clamping voltage at 254 A peak pulse; defines maximum voltage seen by protected downstream ICs. |
| PPPM (10/1000μs) | 6600 W - Peak pulse power handling capability; determines survivability under worst-case load dump energy. |
| IFSM | 700 A - Non-repetitive forward surge rating; supports high-current inrush during fault recovery or hot-swap events. |
| TJ Range | −55°C to +175°C - Operating junction temperature range; enables placement near heat-generating ECUs without derating. |
Pinout & Package
Package: DO-218 - Surface-mount plastic case with integral heatsink tab (anode), optimized for high-power thermal transfer via PCB copper pour. Dimensions: 13.2–13.8 mm length × 3.66–4.26 mm width × 2.58–3.18 mm height (H×B×D).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Current input / Thermal path | Electrically connected to anode; must be soldered to large copper area for thermal management and electrical return. |
| Cathode (Bar-marked lead) | Clamped output / Surge sink | Connected to protected line; conducts transient current to ground/anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade construction | Qualified per AEC-Q101 stress test requirements; manufactured in IATF 16949-certified facilities. |
| Low clamping ratio | VC/VWM = 1.625 - Enables tighter voltage margin between clamping level and downstream IC absolute maximum ratings. |
| High-temperature stability | Leakage <150 μA at VWM and TJ = +175°C - Ensures minimal standby power loss and reliability in under-hood environments. |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); Br+Cl <1500 ppm, Sb <1000 ppm - Meets global environmental and automotive OEM material declarations. |
Applications
| Engine Control Unit Protection | Body Control Module Protection |
|---|---|
Use Scenario: Protecting microcontroller power rails and CAN transceivers in gasoline/diesel engine ECUs exposed to alternator load dump surges. IC Role / Device Role / Timing Role: Primary clamping device placed at main 12 V input, shunting transient energy directly to chassis ground. Use Value: Limits voltage excursion to ≤26.0 V during 6600 W pulses, preventing latch-up or permanent damage to 3.3 V/5 V logic and analog front-ends. | Use Scenario: Safeguarding LIN bus interface ICs and LED driver outputs in door modules and lighting control units. IC Role / Device Role / Timing Role: Unidirectional TVS on switched 12 V supply lines feeding low-voltage regulators and communication interfaces. Use Value: Maintains signal integrity by clamping transients within 100 ns while sustaining <150 μA leakage at +175°C ambient. |
| ADAS Camera Power Input | Electric Power Steering ECU |
Use Scenario: Securing 12 V input of image sensor SoCs and ISP power supplies in forward-facing ADAS cameras mounted near engine compartments. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC-DC converters and LDOs powering CMOS image sensors. Use Value: Withstands repeated 10/1000 μs surges up to 254 A without degradation, preserving startup reliability and image quality. | Use Scenario: Protecting gate drivers and current-sense amplifiers in EPS motor control boards subjected to battery disconnection transients. IC Role / Device Role / Timing Role: High-energy TVS on main battery rail, coordinated with downstream RC snubbers and MOSFET overvoltage protection. Use Value: Delivers 700 A single-half-sine forward surge capability, enabling safe recovery after motor regeneration-induced voltage spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Lower PPPM (400 W), SMA package, 26.0 V VC at 12.3 A IPPM | Not suitable for full ISO 7637-2 load dump; limited to lower-energy transients or secondary protection. | Select only for cost-sensitive non-critical 12 V subsystems where peak power <500 W. |
| SMCJ16A | PPPM = 1500 W, SMC package, same VC (26.0 V) but at 57.7 A IPPM | Meets ISO 7637-2 Pulse 5a only under reduced source impedance; insufficient for full 12 V system validation. | Use where board space allows SMC footprint and system-level testing confirms margin. |
Compared with SMAJ16A and SMCJ16A, ALS8W16A provides 4.4× and 4.4× higher peak pulse power respectively, enabling single-device compliance with full automotive load dump requirements without parallel devices or external filtering.
Availability
ALS8W16A is available at Aetrix Electronics and suitable for automotive ECU protection, body electronics design, ADAS camera power conditioning, and electric power steering systems requiring stable component supply across long production lifecycles.
Supply support for ALS8W16A 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 ALS8WxxA series belongs to Diodes' automotive-qualified TVS portfolio, engineered specifically for load dump suppression in 12 V vehicle electrical systems, with emphasis on thermal robustness, surge repeatability, and AEC-Q101 alignment.
FAQ
What is the polarity configuration of ALS8W16A and how does it affect PCB layout?
ALS8W16A is unidirectional with the heatsink tab as the anode and the bar-marked lead as the cathode. This requires the anode to be connected to the protected circuit's ground or chassis return path, and the cathode to the line being protected. Layout must allocate ≥200 mm² of 2 oz copper under the tab for thermal performance and low-inductance surge current return.
Does ALS8W16A meet AEC-Q101 qualification, and what evidence supports this claim?
ALS8W16A is designed and manufactured to meet AEC-Q101 requirements. Diodes states that parts qualified to AEC-Q100/101/104/200 are available upon request and produced in IATF 16949-certified facilities. The datasheet specifies automotive-grade construction, high-temperature stability up to +175°C, and compliance with ISO 7637-2 and ISO 16750-2-core prerequisites for AEC-Q101 stress test alignment.
How does the 6600 W peak pulse power rating translate to real-world load dump immunity?
The 6600 W rating corresponds to a 10/1000 μs exponential waveform per IEC 61000-4-5 and ISO 7637-2 Pulse 5a, representing worst-case alternator load dump energy. At 16 V VWM, this equates to ~412 A peak current into a 5 Ω source impedance-sufficient to pass full-system validation for Class III/IV vehicles without additional clamping stages.
Can ALS8W16A be used in 24 V commercial vehicle applications?
No-ALS8W16A is specified for 12 V nominal systems. Its 16 V VWM and 26.0 V clamping voltage provide insufficient margin for 24 V bus transients, which require ≥33 V VWM (e.g., ALS8W33A). Using ALS8W16A in 24 V systems risks premature conduction, excessive leakage, and thermal runaway during normal operation.
ALS8W16A 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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 254A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
ALS8W16A FAQ
1.How can I place an order for ALS8W16A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W16A 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 ALS8W16A reliable?
The price and inventory of ALS8W16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W16A is usually 5 days.
3.What payment methods are accepted for ALS8W16A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W16A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W16A?
ALS8W16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W16A 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 ALS8W16A?
For technical support, including ALS8W16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W16A requirements.
6.How does Aetrix verify that ALS8W16A is sourced from the original manufacturer or authorized distributors?
All ALS8W16A 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 ALS8W16A meets industry standards.
7.What is the process for return or replacement of ALS8W16A?
All ALS8W16A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W16A, 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 ALS8W16A part is unused and in its original packaging.
Return procedure for ALS8W16A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W16A Tags
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