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Diodes Incorporated ALS8W26A
- Part No.:
- ALS8W26A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W26A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,202
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Product details
Overview
ALS8W26A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown (VBR), 6600 W peak pulse power (10/1000 µs), and 157 A peak pulse current-designed specifically for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W26A datasheet, ALS8W26A pinout, ALS8W26A application, or ALS8W26A equivalent, this device delivers high-temperature stability (−55°C to +175°C), low thermal resistance, and AEC-Q101 qualification-critical when selecting clamping diodes for 12 V automotive power rail surge suppression.
Technical Context
The ALS8W26A operates as a unidirectional TVS diode with anode-connected heatsink polarity, optimized for fast clamping of exponential load dump waveforms up to 10 ms. Its 42.1 V maximum clamping voltage at 157 A ensures downstream electronics remain below safe overvoltage thresholds during transients.
It meets ISO 7637-2 and ISO 16750-2 surge immunity requirements under defined test conditions, supports 700 A forward surge capability (8.3 ms half-sine), and maintains ≤10 µA reverse leakage at 26 V and ≤150 µA at 175°C-enabling robust operation in under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 28.9 V / 31.9 V - Breakdown initiates within this range at 5 mA test current |
| VC @ IPPM | 42.1 V - Clamped voltage at 157 A peak pulse ensures downstream ICs stay within 45 V tolerance |
| PPPM (10/1000 µs) | 6600 W - Sustains high-energy automotive load dump surges without failure |
| IFSM | 700 A - Withstands 8.3 ms half-sine forward surge, critical for alternator-induced faults |
| TJ Range | −55°C to +175°C - Enables placement near hot engine compartments without derating |
| Package | DO-218 - Thermally efficient plastic case with heatsink-anode configuration for PCB mounting |
Pinout & Package
Package: DO-218 outline plastic package with heatsink-anode polarity; molded "Green" compound (UL 94V-0), matte tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry / Thermal path | Electrically and thermally connected to metal heatsink tab-must be soldered to large copper pour for thermal management |
| Cathode (Bar-marked lead) | Current exit / Transient clamp node | Connected to protected circuit rail; clamps positive transients to ground via anode-to-ground layout |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified and manufactured in IATF 16949 certified facilities-required for production ECUs |
| High-temperature stability | Reverse leakage remains ≤150 µA at +175°C junction temperature-prevents thermal runaway in under-hood use |
| Low thermal resistance | Enables >6 kW pulse dissipation with minimal ΔT rise when heatsink-anode is properly mounted |
| ISO-compliant surge handling | Validated per ISO 7637-2 (Load Dump) and ISO 16750-2 test profiles-reduces need for additional validation effort |
| Lead-free & green compliance | RoHS 3 compliant, halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb)-meets global automotive material mandates |
Applications
| Engine Control Unit Protection | Body Control Module Power Rail |
|---|---|
Use Scenario: Protects microcontroller power inputs in gasoline/diesel engine ECUs exposed to alternator load dump events. IC Role / Device Role: Unidirectional clamping diode placed between battery rail and LDO input, shunting surge energy to chassis ground. Use Value: Limits transient voltage to 42.1 V at 157 A, preventing latch-up or damage to 45 V-rated power management ICs. | Use Scenario: Safeguards BCM power supply during ignition cycling and accessory load switching in 12 V vehicle architectures. IC Role / Device Role: Primary surge suppressor on main 12 V input, upstream of DC-DC converters and CAN transceivers. Use Value: Maintains ≤10 µA leakage at 26 V, minimizing quiescent current drain in always-on modules. |
| LED Headlamp Driver Protection | ADAS Camera Power Input |
Use Scenario: Shields constant-current LED driver ICs from inductive kickback during headlamp dimming and fault clearing. IC Role / Device Role: High-power TVS in parallel with input capacitor, clamping fast-rising transients induced by MOSFET switching. Use Value: 6600 W peak pulse rating absorbs repetitive 10/1000 µs surges without degradation over 10-year vehicle life. | Use Scenario: Secures 12 V input to image sensor SoCs and ISP power rails in front/rear ADAS cameras. IC Role / Device Role: First-line transient suppressor before EMI filter and buck converter, ensuring clean startup after cold cranking. Use Value: −55°C to +175°C operating range supports camera housing near hot exhaust or radiator zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower PPPM (400 W), DO-214AC package, 43.5 V VC @ 9.2 A | Not suitable for ISO 7637-2 load dump; limited to lower-energy transients | Select only for non-automotive or low-risk 12 V systems where surge energy <500 W |
| SMCJ26A | PPPM = 1500 W, DO-214AB package, 42.5 V VC @ 35.3 A | Meets ISO 16750-2 but not full ISO 7637-2 load dump; insufficient for alternator surge | Acceptable for body electronics with controlled surge profiles, but not ECU-critical paths |
Compared with SMAJ26A and SMCJ26A, ALS8W26A provides 4.4× and 4.4× higher peak pulse power respectively, enabling single-device compliance with stringent automotive load dump standards-eliminating need for parallel TVS arrays or secondary protection stages.
Availability
ALS8W26A is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power systems requiring stable component supply across multi-year vehicle production cycles.
Supply support for ALS8W26A 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 ALS8W series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically to meet ISO 7637-2 load dump requirements with enhanced thermal performance and AEC-Q101 qualification.
FAQ
What is the correct PCB layout for ALS8W26A to ensure thermal reliability?
The anode (heatsink) must be connected to a minimum 200 mm² copper pour with ≥2 oz copper thickness and ≥4 thermal vias (0.3 mm diameter) to internal ground planes. Cathode trace width should be ≥1.5 mm to handle 157 A transient current without fusing. Avoid narrow necks or isolation gaps near the heatsink pad.
Does ALS8W26A require derating at elevated ambient temperatures?
Yes-power derating begins above +25°C case temperature per Figure 1 in DS43856. At +100°C case temperature, maximum PPPM drops to ~3300 W (50% derating). Layout and heatsinking must maintain case temperature ≤85°C in worst-case under-hood conditions to sustain full 6600 W rating.
Can ALS8W26A be used in bidirectional surge protection configurations?
No-ALS8W26A is strictly unidirectional with anode-heatsink polarity. It clamps only positive transients relative to ground. For bidirectional protection (e.g., data lines), separate devices or dedicated bidirectional TVS arrays like D28V0L4BPSQ are required.
How does ALS8W26A compare to standard TVS diodes in terms of surge lifetime endurance?
ALS8W26A is characterized for >1000 repetitive 10/1000 µs surges at rated PPPM without parameter shift, verified per AEC-Q101 stress testing. Standard TVS diodes (e.g., SMAJ series) typically specify only single-pulse rating and lack automotive-cycle endurance validation.
ALS8W26A 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 157A
- 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
ALS8W26A FAQ
1.How can I place an order for ALS8W26A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W26A 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 ALS8W26A reliable?
The price and inventory of ALS8W26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W26A is usually 5 days.
3.What payment methods are accepted for ALS8W26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W26A?
ALS8W26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W26A 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 ALS8W26A?
For technical support, including ALS8W26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W26A requirements.
6.How does Aetrix verify that ALS8W26A is sourced from the original manufacturer or authorized distributors?
All ALS8W26A 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 ALS8W26A meets industry standards.
7.What is the process for return or replacement of ALS8W26A?
All ALS8W26A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W26A, 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 ALS8W26A part is unused and in its original packaging.
Return procedure for ALS8W26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W26A Tags
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