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Diodes Incorporated ALS8W30A
- Part No.:
- ALS8W30A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W30A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:5,078
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Product details
Overview
ALS8W30A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown (VBR), 6600 W peak pulse power (10/1000 µs), and 136 A peak pulse current-designed specifically for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W30A datasheet, ALS8W30A pinout, ALS8W30A application, or ALS8W30A equivalent, this device is selected for high-energy clamping in 12 V automotive systems where thermal stability up to +175 °C, low forward voltage (<1.8 V at 100 A), and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with anode-connected heatsink configuration, enabling direct mounting to PCB copper planes for enhanced thermal dissipation. Its 6600 W surge rating at 10/1000 µs and 5200 W at 10/10000 µs supports compliance with ISO 16750-2 severe load dump waveforms under elevated case temperatures.
The device exhibits <10 µA reverse leakage at 30 V and +25 °C, rising to ≤150 µA at +175 °C, ensuring stable blocking behavior across automotive temperature extremes. Clamping voltage is specified at 48.4 V under 136 A peak pulse, delivering predictable overvoltage protection margin for downstream 3.3 V/5 V/12 V rail electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold for 12 V automotive bus. |
| VBR (min/max) | 33.3 V / 36.8 V - Verified breakdown range at 5 mA; ensures consistent turn-on across production lots and temperature. |
| PPPM (10/1000 µs) | 6600 W - Peak surge energy handling capability; sustains single load dump event without failure per ISO 7637-2 Test Pulse 5a. |
| IPP (10/1000 µs) | 136 A - Corresponding peak current at clamping voltage; defines minimum trace width and fuse coordination requirements. |
| VC @ IPP | 48.4 V - Clamped voltage during 136 A surge; establishes maximum stress on protected ICs (e.g., CAN transceivers, microcontrollers). |
| TJ Range | −55 °C to +175 °C - Full automotive junction temperature rating; enables placement near heat sources like power MOSFETs or DC/DC converters. |
| IFSM | 700 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush current tolerance during cold-crank or battery-reconnect events. |
Pinout & Package
Package: DO-218 plastic outline with integral heatsink tab (anode terminal). Molded "Green" compound (UL 94V-0), matte tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Main current path input / thermal interface | Electrically and thermally connected to PCB copper pour; must be soldered to ≥200 mm² 2 oz copper for rated 6600 W performance. |
| Cathode (Bar-marked lead) | Clamping output / reference node | Connected to protected circuit ground or low-side return; polarity-sensitive installation required to avoid catastrophic short. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified, manufactured in IATF 16949 certified facilities; supports PPAP documentation for Tier-1 OEM programs. |
| High-temperature stability | Leakage remains ≤150 µA at +175 °C; enables reliable operation in engine bay or under-hood ECUs without derating. |
| Low thermal resistance | RθJC = 0.35 °C/W typical (measured); allows >90% of surge energy to dissipate through heatsink tab into PCB. |
| ISO 7637-2 / 16750-2 compliance | Validated for Load Dump Pulse 5a (12 V system, 100 V/400 ms) and Pulse 5b (24 V system, 200 V/400 ms) test conditions. |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); Br+Cl <1500 ppm, Sb <1000 ppm; meets automotive OEM green material specifications. |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects MCU, CAN transceiver, and sensor interfaces in gasoline/diesel engine ECUs exposed to alternator load dump surges during ignition-off events. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and protected subsystem; activates within nanoseconds upon overvoltage detection. Use Value: Limits transient voltage to ≤48.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and analog front-ends. |
Use Scenario: Shields lighting drivers, window motor controllers, and door module power supplies from battery line transients during load switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V main input rail; coordinated with upstream fuses and downstream LDOs. Use Value: Enables robust operation at +125 °C ambient with <10 µA leakage, reducing standby power loss in always-on BCM functions. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Power Supply |
Use Scenario: Safeguards radar SoCs, camera ISPs, and power management ICs in front radar modules mounted near vehicle grille or bumper. IC Role / Device Role / Timing Role: First-line transient suppression before DC/DC converters; handles repetitive 10/1000 µs pulses up to 6600 W. Use Value: Maintains signal integrity during repeated load dump events without parameter drift-critical for ASIL-B functional safety compliance. |
Use Scenario: Clamps surges on head unit 12 V input caused by HVAC blower motor commutation or seat heater cycling. IC Role / Device Role / Timing Role: High-energy TVS placed at main power entry point; thermally coupled to chassis ground plane. Use Value: Eliminates need for secondary LC filtering due to fast response (<1 ns) and low clamping ratio (VC/VWM = 1.61). |
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 |
|---|---|---|---|
| SMAJ30A (onsemi) | DO-214AC package; 600 W PPPM (10/1000 µs); VBR = 33.3–36.7 V; VC = 48.4 V @ 12.3 A | Lower surge rating limits use to low-energy sub-systems (e.g., sensors), not main ECU rails | Select when board space is constrained and peak surge energy ≤600 W suffices. |
| TPSMD30A (Littelfuse) | DO-218 package; 6600 W PPPM; VBR = 33.3–36.7 V; VC = 48.4 V @ 136 A; AEC-Q101 qualified | Identical clamping performance and thermal design; differs in marking layout and reel packaging | Drop-in replacement with identical PCB footprint and thermal profile-verify date code traceability for OEM audits. |
Compared with SMAJ30A and TPSMD30A, ALS8W30A delivers matching clamping voltage and AEC-Q101 compliance but offers superior thermal interface via its DO-218 heatsink tab-enabling higher sustained surge duty cycles in compact under-hood layouts.
Availability
ALS8W30A is available at Aetrix Electronics and suitable for automotive ECU protection, body control modules, ADAS power conditioning, and infotainment system surge suppression requiring stable component supply across multi-year production cycles.
Supply support for ALS8W30A 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.
ALS8W30A belongs to Diodes' Automotive TVS Diode family, engineered specifically for ISO 7637-2/16750-2-compliant load dump protection in 12 V and 24 V vehicle electrical systems.
FAQ
What is the recommended PCB layout for optimal thermal performance of ALS8W30A?
Mount the anode heatsink tab directly to ≥200 mm² of 2 oz copper on the primary layer, connected via ≥8 thermal vias (0.3 mm diameter) to inner/ground planes. Avoid solder mask over the tab area and ensure ≥0.5 mm clearance from adjacent components to prevent thermal crosstalk during surge events.
Does ALS8W30A meet AEC-Q101 requirements out-of-the-box?
Yes-ALS8W30A is fully AEC-Q101 qualified per Rev. 9 of DS43856. Qualification includes HTOL (1000 hrs @ +175 °C), temperature cycling (−55 °C to +175 °C, 1000 cycles), and ESD (HBM ±8 kV). Full test reports and PPAP documentation are available upon request for qualified customers.
Can ALS8W30A be used in 24 V commercial vehicle systems?
Yes-its 6600 W rating and 48.4 V clamping voltage provide adequate margin for ISO 16750-2 Pulse 5b (200 V/400 ms) in 24 V systems. However, system-level validation is required to confirm coordination with upstream fusing and downstream voltage regulators under worst-case transient overlap conditions.
How does the DO-218 package compare to SMA/SMC alternatives for surge handling?
DO-218 provides ~3× lower thermal resistance than SMA (RθJC ≈ 1.2 °C/W) and ~1.8× lower than SMC (RθJC ≈ 0.65 °C/W), enabling full 6600 W dissipation without external heatsinks. Its integrated tab eliminates mechanical stress on leads during thermal cycling-critical for under-hood reliability.
ALS8W30A 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 136A
- 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
ALS8W30A FAQ
1.How can I place an order for ALS8W30A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W30A 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 ALS8W30A reliable?
The price and inventory of ALS8W30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W30A is usually 5 days.
3.What payment methods are accepted for ALS8W30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W30A?
ALS8W30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W30A 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 ALS8W30A?
For technical support, including ALS8W30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W30A requirements.
6.How does Aetrix verify that ALS8W30A is sourced from the original manufacturer or authorized distributors?
All ALS8W30A 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 ALS8W30A meets industry standards.
7.What is the process for return or replacement of ALS8W30A?
All ALS8W30A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W30A, 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 ALS8W30A part is unused and in its original packaging.
Return procedure for ALS8W30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W30A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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