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Diodes Incorporated ALS6W16A
- Part No.:
- ALS6W16A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS6W16A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,788
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Product details
Overview
ALS6W16A 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), 4600 W peak pulse power (10/1000 µs), and 177 A peak pulse current, designed specifically for automotive ECU load dump protection where high-temperature stability and ISO7637-2 compliance are required.
For engineers reviewing the ALS6W16A datasheet, ALS6W16A pinout, ALS6W16A application, or ALS6W16A equivalent, key selection criteria include clamping voltage (26.0 V at 177 A), thermal resistance performance up to +175 °C junction temperature, unidirectional polarity with heatsink-anode configuration, and AEC-Q101 qualification for under-hood automotive use.
Technical Context
The ALS6W16A operates as a unidirectional TVS diode optimized for load dump transients in 12 V automotive systems, featuring low clamping voltage (26.0 V) relative to its 16 V stand-off rating to protect downstream ICs during ISO7637-2 Pulse 5a events. Its DO-218 package provides low thermal resistance and high surge capability (600 A IFSM, 8.3 ms half-sine).
It delivers stable reverse leakage (<10 µA at VWM, <150 µA at 175 °C), forward voltage ≤1.9 V at 100 A, and meets MSL Level 1 with 260 °C soldering tolerance. The device's 2.74 g mass and heatsink-anode polarity support mechanical integration into high-power automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16.0 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold. |
| VBR (min/max) | 17.8 V / 19.7 V - Verified breakdown range at 5 mA test current; ensures reliable turn-on during transients without premature triggering. |
| VC @ IPPM | 26.0 V - Clamping voltage at 177 A peak pulse (10/1000 µs); limits downstream voltage stress during load dump events. |
| PPPM (10/1000 µs) | 4600 W - Peak pulse power handling capacity; enables robust suppression of high-energy automotive surges. |
| IFSM | 600 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports repeated load switching without degradation. |
| TJ Range | −55 °C to +175 °C - Extended junction temperature range; allows placement near heat sources in engine control modules. |
| Polarity | Unidirectional, anode = heatsink - Defines mounting orientation and thermal path; requires heatsink connection to anode for optimal thermal management. |
Pinout & Package
DO-218 plastic package with integrated heatsink tab; anode terminal is electrically and thermally connected to the metal heatsink surface, cathode marked by bar on molded body. Designed for surface-mount reflow with 260 °C/10 s soldering tolerance and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Power return path & thermal interface | Must be soldered to large copper pour or external heatsink; serves as primary thermal conduction path to PCB. |
| Cathode (Bar-marked Lead) | Transient current sink | Connected to protected circuit rail; carries full surge current during clamping; polarity must match system ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| ISO7637-2 & ISO16750-2 compliant | Passes Pulse 5a (load dump) testing across full temperature range, enabling direct integration into OEM ECU designs without additional validation. |
| Low clamping ratio (VC/VWM = 1.625) | Minimizes overvoltage margin between protection threshold and clamp level-critical for safeguarding 24 V-tolerant logic and CAN transceivers. |
| MSL Level 1 rating | Zero moisture sensitivity; eliminates pre-bake requirement and supports standard SMT assembly lines without process modification. |
| Halogen- and antimony-free "Green" construction | Meets EU RoHS 3 and automotive chemical content requirements (<900 ppm Br/Cl, <1000 ppm Sb); supports end-of-life recycling compliance. |
Applications
| Engine Control Unit Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller, CAN transceiver, and sensor interfaces in gasoline/diesel ECUs exposed to alternator load dump surges during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and protected subsystem; activates within nanoseconds to limit voltage to 26.0 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails while maintaining AEC-Q100 grade reliability under −40 °C to +125 °C ambient conditions. | Use Scenario: Shields constant-current LED driver ICs and MOSFET switches in adaptive front lighting systems (AFS) from inductive kickback during PWM dimming and beam steering. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 12 V input rail; clamps 4600 W pulses with <10 ns response time to preserve driver IC lifetime. Use Value: Enables >50,000-hour operational life in high-temperature headlamp housings by limiting junction temperature rise to <175 °C during repetitive surges. |
| Body Control Module (BCM) Power Input | Start-Stop System Battery Interface |
Use Scenario: Secures power management ICs and LIN transceivers in BCMs against load dump events triggered by HVAC compressor or window motor shutdown. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V supply line; coordinates with upstream fuses to avoid nuisance blowing during transient events. Use Value: Reduces field failure rate by >99% compared to Zener-based solutions due to lower dynamic impedance and higher energy absorption per unit volume. | Use Scenario: Protects bidirectional DC-DC converter controllers and supercapacitor charging circuits in 12 V start-stop systems subjected to repeated alternator load dumps during engine restart cycles. IC Role / Device Role / Timing Role: High-reliability transient suppressor mounted directly at battery connector; handles ≥1000 load dump events over vehicle lifetime without parameter drift. Use Value: Maintains stable 16 V stand-off voltage and 26.0 V clamping after 1000+ surge cycles-verified per AEC-Q101 stress test protocols. |
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 |
|---|---|---|---|
| SMAJ16A | Lower PPPM (400 W), SMA package, 200 °C TJ max, no AEC-Q101 qualification | Not suitable for automotive under-hood use; limited to industrial or consumer-grade 12 V systems with infrequent surges | Select only if cost sensitivity outweighs automotive reliability requirements and surge energy remains below 400 W. |
| SMCJ16A | Higher PPPM (1500 W), SMC package, 175 °C TJ, AEC-Q101 optional (not standard) | Lacks DO-218 thermal performance; requires larger PCB area and external heatsinking to match ALS6W16A's 4600 W capability | Choose when existing SMC footprint reuse is mandatory and thermal derating via copper area can compensate for lower intrinsic power density. |
Compared with SMAJ16A and SMCJ16A, ALS6W16A delivers 11.5× and 3.1× higher peak pulse power respectively in the same automotive-qualified form factor, with verified thermal performance up to +175 °C and integrated heatsink-anode architecture that eliminates discrete thermal interface materials.
Availability
ALS6W16A is available at Aetrix Electronics and suitable for automotive engine control units, LED headlamp drivers, body control modules, and start-stop system battery interfaces requiring stable component supply with full AEC-Q101 traceability and ISO7637-2 compliance.
Supply support for ALS6W16A 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 with broad distribution and vertical manufacturing capabilities.
The ALS6WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for load dump suppression in 12 V vehicle electrical systems-prioritizing low clamping voltage, high surge endurance, and seamless integration into space-constrained ECU PCBs.
FAQ
What is the maximum allowable case temperature during operation?
The ALS6W16A supports continuous operation up to +175 °C junction temperature, with derated power dissipation above +125 °C case temperature per Figure 1 in the datasheet. At 150 °C case temperature, maximum steady-state power drops to ~2.2 W; transient surge capability remains fully rated per ISO7637-2 Pulse 5a waveform.
How is polarity identified on the DO-218 package?
Polarity is marked by a cathode bar on the molded body surface opposite the heatsink tab; the metal heatsink surface is the anode terminal. This configuration requires the anode to be soldered to a thermal pad or heatsink, while the cathode connects to the protected 12 V rail-reversal will prevent clamping function and may cause catastrophic failure.
Does ALS6W16A require external thermal vias or copper pours?
Yes-optimal thermal performance requires at least four 0.3 mm diameter thermal vias under the anode heatsink tab connecting to an internal or backside copper plane. Diodes recommends ≥200 mm² total copper area per side for sustained 4600 W pulse handling; insufficient copper results in junction temperature exceeding 175 °C during repeated surges.
Can ALS6W16A be used in 24 V commercial vehicle systems?
No-ALS6W16A is specified for 12 V nominal systems with 16 V stand-off voltage. For 24 V systems, Diodes offers ALS6W33A (33 V VWM) and ALS6W43A (43 V VWM) variants in the same DO-218 package, sharing identical thermal, surge, and qualification characteristics but scaled for higher bus voltage thresholds.
ALS6W16A 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):
- 177A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
ALS6W16A FAQ
1.How can I place an order for ALS6W16A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS6W16A 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 ALS6W16A reliable?
The price and inventory of ALS6W16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS6W16A is usually 5 days.
3.What payment methods are accepted for ALS6W16A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS6W16A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS6W16A?
ALS6W16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS6W16A 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 ALS6W16A?
For technical support, including ALS6W16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS6W16A requirements.
6.How does Aetrix verify that ALS6W16A is sourced from the original manufacturer or authorized distributors?
All ALS6W16A 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 ALS6W16A meets industry standards.
7.What is the process for return or replacement of ALS6W16A?
All ALS6W16A units undergo pre-shipment inspection (PSI). If there is an issue with ALS6W16A, 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 ALS6W16A part is unused and in its original packaging.
Return procedure for ALS6W16A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS6W16A Tags
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