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Diodes Incorporated ALS8W36A
- Part No.:
- ALS8W36A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W36A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,867
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Product details
Overview
ALS8W36A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 36 V stand-off voltage (VWM), 40.0–44.2 V breakdown (VBR), 6600 W peak pulse power (10/1000 μs), and 114 A peak pulse current, designed for automotive ECU protection against ISO 7637-2 load dump transients.
For engineers reviewing the ALS8W36A datasheet, ALS8W36A pinout, ALS8W36A application, or ALS8W36A equivalent, key selection criteria include clamping voltage (58.1 V at IPPM), thermal stability up to +175°C junction temperature, low forward voltage drop (≤1.8 V at 100 A), and compliance with AEC-Q101 for automotive-grade reliability.
Technical Context
This TVS diode operates as a unidirectional clamping device with anode-connected heatsink polarity, optimized for high-energy, short-duration load dump surges in 12 V automotive systems. Its DO-218 package enables direct mounting to metal chassis for low thermal resistance and efficient heat dissipation during 10 ms exponential waveform events.
It meets ISO 7637-2 and ISO 16750-2 surge test requirements under specified conditions, with validated performance across -55°C to +175°C operating junction temperature range and ≤10 μA reverse leakage at VWM (36 V) up to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 40.0 / 44.2 V - Breakdown voltage range at 5 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 58.1 V - Clamping voltage at 114 A peak pulse; determines maximum protected circuit stress |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capability for standard load dump waveform |
| IFSM | 700 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports high-current switching events |
| TJ Range | -55°C to +175°C - Validated junction temperature range for automotive under-hood operation |
| Leakage @ VWM | ≤10 μA at 25°C; ≤150 μA at +175°C - Ensures minimal standby power loss and signal integrity |
Pinout & Package
Package: DO-218 - Surface-mount plastic outline with integral heatsink tab (anode terminal), UL 94V-0 rated molding compound, matte tin-plated terminals, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Main current-carrying terminal and thermal path | Electrically connected to anode; must be soldered to copper pour or chassis for thermal management and electrical reference |
| Cathode (Bar-marked Lead) | Clamping output node | Connected to protected circuit rail; conducts surge current to anode/heatsink when VREV exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| High peak pulse power | 6600 W (10/1000 μs) enables single-device protection against severe automotive load dump without external crowbar circuits |
| Low thermal resistance | DO-218 heatsink tab design achieves <1.5°C/W junction-to-case, critical for sustained surge energy dissipation |
| Automotive qualification | AEC-Q101 qualified and manufactured in IATF 16949 certified facilities, supporting PPAP documentation for OEM programs |
| High-temperature stability | Reverse leakage remains ≤150 μA at +175°C, ensuring reliable clamping behavior in under-hood environments |
| Low forward voltage | ≤1.8 V at 100 A (8.3 ms) minimizes conduction loss and self-heating during high-current surge events |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protects microcontroller power inputs and CAN transceiver rails from battery line transients during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery feed and local LDO input, shunting surge current to chassis ground. Use Value: Limits transient voltage to ≤58.1 V, preventing damage to 3.3 V/5 V logic supplies and maintaining system reset integrity. | Use Scenario: Shields lighting driver ICs and window motor controllers from voltage spikes induced by relay switching and inductive loads. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V main supply rail upstream of DC-DC converters and gate drivers. Use Value: Withstands 700 A non-repetitive surge and maintains ≤10 μA leakage at 36 V, preserving sleep-mode current budgets. |
| ADAS Camera Power Input | Infotainment Head Unit Power Stage |
Use Scenario: Safeguards image sensor and ISP power domains in rear-view and surround-view cameras exposed to vehicle-level transients. IC Role / Device Role / Timing Role: First-line transient suppressor on fused 12 V input, preceding EMI filter and buck converter. Use Value: Clamps within 100 ns to ≤58.1 V, preventing latch-up or permanent damage to CMOS image sensors operating at 1.2 V core. | Use Scenario: Protects audio amplifier power stages and USB-C PD controller inputs from ignition-switching noise and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional-capable system uses unidirectional ALS8W36A on positive rail only, paired with GND-referenced TVS on return path. Use Value: Delivers 6600 W pulse handling with <2.74 g mass, enabling compact layout in space-constrained infotainment enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Lower PPPM (400 W), SMA package, 58.1 V VC but only 64.3 V VBR min, 10× lower surge current rating (32.4 A) | Intended for board-level ESD/surge, not full load dump; unsuitable for ISO 7637-2 Level 5 testing | Select only for cost-sensitive non-automotive 12 V systems with sub-100 W surge exposure |
| SMCJ36A | Higher PPPM (1500 W), SMC package, same VWM/VBR range, but 100 A IPPM and 69.4 V VC - less effective clamping than ALS8W36A's 58.1 V | Valid for ISO 7637-2 Level 3; insufficient for Level 5 (load dump) without parallel devices | Use where DO-218 footprint is unavailable and 6600 W single-device solution is not required |
Compared with SMAJ36A and SMCJ36A, ALS8W36A delivers 4.4× and 4.4× higher peak pulse power respectively, with superior clamping voltage (58.1 V vs. ≥69.4 V), enabling single-device compliance with ISO 7637-2 load dump requirements in space-constrained automotive modules.
Availability
ALS8W36A is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power systems, and infotainment head units requiring stable component supply for automotive production programs.
Supply support for ALS8W36A 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.
The ALS8WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for high-energy load dump suppression in 12 V vehicle electrical systems, emphasizing thermal robustness, AEC-Q101 compliance, and ISO 7637-2 validation.
FAQ
What is the maximum clamping voltage of ALS8W36A at its rated peak pulse current?
The maximum clamping voltage (VC) of ALS8W36A is 58.1 V when subjected to its peak pulse current (IPPM) of 114 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees the protected circuit will not experience voltage stress beyond this level during a defined surge event.
Is ALS8W36A suitable for bidirectional transient suppression?
No, ALS8W36A is a unidirectional TVS diode with anode-connected heatsink polarity. It conducts only during reverse-biased overvoltage events and does not protect against positive-going transients on the cathode side. For bidirectional protection, a separate device or a dedicated bidirectional TVS must be used in conjunction.
Does ALS8W36A require derating at elevated ambient temperatures?
Yes - its peak pulse power rating decreases above +25°C case temperature, following the derating curve in Figure 1 of DS43856. At +125°C case temperature, maximum PPPM drops to approximately 3000 W (10/1000 μs), requiring thermal design verification to ensure adequate heatsinking in high-temperature environments.
Can ALS8W36A be used in non-automotive 24 V systems?
No - ALS8W36A is rated for 36 V stand-off voltage and optimized for 12 V automotive load dump (ISO 7637-2 Pulse 5a/b). In 24 V systems, its VWM is too low for steady-state operation, risking premature conduction and thermal failure; use ALS8W43A (43 V VWM) or higher-rated variants instead.
ALS8W36A 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 114A
- 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
ALS8W36A FAQ
1.How can I place an order for ALS8W36A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W36A 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 ALS8W36A reliable?
The price and inventory of ALS8W36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W36A is usually 5 days.
3.What payment methods are accepted for ALS8W36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W36A?
ALS8W36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W36A 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 ALS8W36A?
For technical support, including ALS8W36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W36A requirements.
6.How does Aetrix verify that ALS8W36A is sourced from the original manufacturer or authorized distributors?
All ALS8W36A 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 ALS8W36A meets industry standards.
7.What is the process for return or replacement of ALS8W36A?
All ALS8W36A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W36A, 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 ALS8W36A part is unused and in its original packaging.
Return procedure for ALS8W36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W36A Tags
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