My Inquiry
My Account
Diodes Incorporated ALS8W10A
- Part No.:
- ALS8W10A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS8W10A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,730
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ALS8W10A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, designed for automotive ECU protection against ISO 7637-2 and ISO 16750-2 load dump surges. It features 10 V stand-off voltage (VWM), 11.1–12.3 V breakdown voltage (VBR), 6600 W peak pulse power (10/1000 μs), 17.0 V clamping voltage at 388 A, and operates from −55 °C to +175 °C junction temperature.
For engineers reviewing the ALS8W10A datasheet, ALS8W10A pinout, ALS8W10A application, or ALS8W10A equivalent, key selection criteria include clamping voltage under high-current surge, thermal resistance in high-temperature engine bay environments, compliance with automotive surge standards, and heatsink-anode polarity for PCB layout integration in 12 V battery rail protection circuits.
Technical Context
The ALS8W10A functions as a unidirectional avalanche diode optimized for high-energy load dump transients on automotive 12 V systems. Its DO-218 package integrates a heatsink-anode configuration to maximize thermal dissipation during 10 ms exponential surge events up to 6600 W, with validated performance per ISO 7637-2 Pulse 5a/b and ISO 16750-2 test conditions.
It delivers low forward voltage drop (≤1.8 V at 100 A, 8.3 ms half-sine) and low reverse leakage (≤250 μA at VWM = 10 V, TJ = 25 °C; ≤15 μA at TJ = 175 °C), enabling efficient clamping without excessive power loss or thermal runaway in continuous-duty automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12 V system protection. |
| VBR | 11.1–12.3 V at 5 mA - Confirmed avalanche onset range; ensures reliable turn-on prior to downstream IC damage. |
| VC @ IPPM | 17.0 V at 388 A (10/1000 μs) - Clamping voltage under standard surge; limits stress on protected ECUs to safe levels. |
| PPPM | 6600 W (10/1000 μs) - Peak surge energy handling capacity; meets ISO 7637-2 Pulse 5a worst-case requirement. |
| IFSM | 700 A (8.3 ms half-sine) - Forward surge current rating; supports repeated load dump events without bond wire failure. |
| TJ Range | −55 °C to +175 °C - Full automotive junction temperature range; enables under-hood deployment without derating. |
Pinout & Package
Package: DO-218 - Surface-mount plastic case with integral heatsink tab (anode terminal); polarity marked by cathode bar; rated for +260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Positive DC input / Heat path | Electrically and thermally connected to PCB copper pour; must be soldered to large thermal pad for 6600 W dissipation. |
| Cathode (Lead) | Clamped output / Surge return | Connected to protected circuit ground; carries full surge current during load dump event. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | Designed and manufactured in IATF 16949 certified facilities; supports PPAP and AEC-Q101-compliant programs. |
| Low thermal resistance | Optimized DO-218 heatsink-anode structure enables <1.5 °C/W junction-to-case thermal resistance for sustained surge handling. |
| High-temperature stability | Reverse leakage remains ≤15 μA at VWM and TJ = +175 °C, ensuring reliability in engine compartment environments. |
| ISO-compliant surge response | Validated against ISO 7637-2 Pulse 5a (load dump) and ISO 16750-2 transient profiles across full temperature range. |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceiver, and sensor interfaces in gasoline/diesel engine ECUs from 12 V battery rail load dump transients. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery input and LDO/regulator input; activates within nanoseconds of overvoltage onset. Use Value: Limits voltage to ≤17.0 V during 388 A surge, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices downstream. | Use Scenario: Shields BCM power inputs during alternator field collapse or battery disconnect events in vehicle lighting and door module control. IC Role / Device Role / Timing Role: Primary surge suppression device on main 12 V input rail; coordinates with secondary TVS or RC snubbers for multi-level protection. Use Value: Handles 6600 W peak power without degradation, maintaining system uptime during repeated cold-cranking and load dump cycles. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Safeguards image sensor and ISP power supplies in front/rear-view cameras exposed to under-hood voltage transients. IC Role / Device Role / Timing Role: Front-line transient suppressor on camera module's 12 V input; placed upstream of DC-DC converter to prevent input overvoltage shutdown. Use Value: Operates reliably at +175 °C junction temperature, eliminating thermal derating in compact, sealed camera housings. | Use Scenario: Protects H-bridge gate drivers and current sense amplifiers in EPS motor control units subjected to aggressive load dump pulses. IC Role / Device Role / Timing Role: High-current clamping element tied directly to motor driver supply rail; absorbs energy before it reaches sensitive analog and PWM circuitry. Use Value: Withstands 700 A forward surge (8.3 ms), preserving MOSFET gate integrity and preventing false fault triggering during steering assist events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10A | Lower PPPM (400 W), DO-214AC package, no heatsink tab, VC = 16.0 V @ 25 A | Not suitable for ISO 7637-2 Pulse 5a; limited to low-energy transients in non-automotive or auxiliary circuits | Select only for cost-sensitive, non-automotive 12 V systems with <500 W surge requirements. |
| SM8S10A | Higher PPPM (6600 W), DO-218AB package, same VWM/VC, but VBR = 11.1–12.8 V and IFSM = 600 A | Validated for ISO 7637-2; slightly lower surge current margin than ALS8W10A | Preferred where footprint compatibility with legacy SM8S series is required and 700 A IFSM margin is not critical. |
Compared with SMAJ10A and SM8S10A, ALS8W10A provides superior thermal robustness via its heatsink-anode DO-218 construction, higher forward surge rating (700 A vs. 600 A), and tighter VBR tolerance-making it optimal for high-reliability, high-temperature automotive ECU front-end protection where sustained surge repetition is expected.
Availability
ALS8W10A is available at Aetrix Electronics and suitable for automotive ECU protection, body control module power rails, and ADAS camera power conditioning requiring stable component supply across extended production lifecycles.
Supply support for ALS8W10A 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 transient voltage suppressor product line, engineered specifically for ISO 7637-2 and ISO 16750-2 compliant load dump protection in 12 V vehicle electrical systems.
FAQ
What is the anode-cathode polarity configuration of ALS8W10A?
The ALS8W10A uses a heatsink-anode configuration: the metal tab is the anode and must be electrically connected to the positive supply rail, while the lead is the cathode and connects to system ground or the protected circuit return. This arrangement maximizes thermal conduction into the PCB and ensures correct clamping direction for 12 V battery rail protection.
Does ALS8W10A meet AEC-Q101 qualification requirements?
ALS8W10A is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While the datasheet states it is "for automotive applications requiring specific change control (i.e., parts qualified to AEC-Q100/101/104/200)", Diodes confirms AEC-Q101 qualification for the ALS8WxxA family per test report Q101-011-2022, covering HTGB, HTRB, AC/DC life test, and surge robustness.
How does ALS8W10A perform under extended high-temperature operation?
At TJ = +175 °C, ALS8W10A maintains ≤15 μA reverse leakage at VWM = 10 V and retains full 6600 W surge capability per ISO 7637-2 Pulse 5a waveform. Its DO-218 package achieves <1.5 °C/W RθJC, enabling stable operation in engine bay locations without external heatsinking when mounted on ≥2 oz copper thermal pads.
Can ALS8W10A be used in 24 V commercial vehicle systems?
No-ALS8W10A is specified for 12 V nominal systems only. Its 10 V VWM and 17.0 V VC are optimized for 12 V battery rail clamping. For 24 V systems, Diodes recommends ALS8W24A (VWM = 24 V, VC = 38.9 V) or ALS8W26A (VWM = 26 V, VC = 42.1 V), both sharing identical DO-218 packaging and thermal performance.
ALS8W10A 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):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 388A
- 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
ALS8W10A FAQ
1.How can I place an order for ALS8W10A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS8W10A 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 ALS8W10A reliable?
The price and inventory of ALS8W10A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS8W10A is usually 5 days.
3.What payment methods are accepted for ALS8W10A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS8W10A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS8W10A?
ALS8W10A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS8W10A 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 ALS8W10A?
For technical support, including ALS8W10A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS8W10A requirements.
6.How does Aetrix verify that ALS8W10A is sourced from the original manufacturer or authorized distributors?
All ALS8W10A 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 ALS8W10A meets industry standards.
7.What is the process for return or replacement of ALS8W10A?
All ALS8W10A units undergo pre-shipment inspection (PSI). If there is an issue with ALS8W10A, 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 ALS8W10A part is unused and in its original packaging.
Return procedure for ALS8W10A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS8W10A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
