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Diodes Incorporated DM8W18AQ-13
- Part No.:
- DM8W18AQ-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
DM8W18AQ-13.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO218
- Quantity:
- Payment:
- Shipping:
Inventory:6,524
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Product details
Overview
DM8W18AQ-13 from Diodes Incorporated is a surface-mount transient voltage suppressor (TVS) diode designed for automotive load-dump and ISO7637-2 surge protection. It features 6600W peak pulse power (10/1000µs), 18V reverse standoff voltage (VRWM), 29.2V max clamping voltage at 226A, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the DM8W18AQ-13 datasheet, DM8W18AQ-13 pinout, DM8W18AQ-13 application, or DM8W18AQ-13 equivalent, key selection criteria include clamping performance at 226A IPP, thermal resistance of 0.9°C/W (RθJC), DO-218 package polarity (heatsink = anode), and compliance with ISO16750-2 Pulse A/B and ISO7637-2 Pulses 1/2a/3a/3b.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode to clamp high-energy transients. Its glass-passivated die construction ensures stable leakage (<10µA at VRWM) and robust high-temperature operation up to TJ = +175°C.
The device is optimized for automotive 12V systems, where it protects ECUs, body control modules, and infotainment units against load-dump surges (up to 35V, 10ms exponential) and coupled transients defined in ISO standards. Its DO-218 (Type E) package provides low thermal impedance and mechanical robustness for under-hood mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 6600W (10/1000µs waveform); sustains single high-energy load-dump events without failure |
| Reverse Standoff Voltage | 18V; blocks normal battery voltage (13.5V nominal) while remaining inactive during steady-state operation |
| Max Clamping Voltage | 29.2V at 226A IPP; limits downstream IC voltage to safe levels during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.9°C/W; enables efficient heat transfer to heatsink or PCB copper, critical for sustained power dissipation |
| Operating Temperature Range | −55°C to +175°C; supports placement near engines or in hot chassis locations per AEC-Q101 requirements |
| AEC-Q101 Qualified | Yes; validated for automotive reliability including temperature cycling, HTRB, and surge endurance testing |
Pinout & Package
Package: DO-218 (Type E), molded plastic case (UL 94V-0), 2.74g weight. Heatsink tab is electrically connected to the anode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Positive input / surge return path | Primary thermal interface; must be soldered to large copper area or external heatsink for RθJC = 0.9°C/W performance |
| Cathode (Top Lead) | Protected circuit connection | Connected to sensitive node (e.g., MCU power rail); clamps voltage when transient exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 6600W Peak Pulse Power | Handles ISO16750-2 load-dump surges (up to 35V, 10ms) without degradation in automotive 12V systems |
| Glass-Passivated Die | Ensures stable leakage current (<10µA at VRWM) and long-term reliability under thermal cycling and humidity stress |
| DO-218 (Type E) Package | Enables direct mounting to metal chassis or heatsink; achieves 0.9°C/W thermal resistance for high-power dissipation |
| AEC-Q101 Qualification | Validated for automotive use with PPAP documentation support and manufacturing in IATF 16949 certified facilities |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 5V/3.3V microcontroller power rails from alternator load-dump transients during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery feed and LDO input. Use Value: Limits voltage to ≤29.2V during 226A surge, preventing latch-up or permanent damage to automotive-grade MCUs. |
Use Scenario: Shields LIN bus transceivers and power switches from ISO7637-2 Pulse 1 (inductive kickback) and Pulse 3b (capacitive discharge). IC Role / Device Role / Timing Role: Primary overvoltage protection on 12V supply line upstream of DC-DC converters. Use Value: Maintains <10µA leakage at 18V VRWM to avoid quiescent current impact on sleep-mode BCM power budget. |
| Infotainment Head Unit | ADAS Camera Power Supply |
Use Scenario: Guards USB-C PD controller and display driver ICs against conducted surges entering via vehicle harness. IC Role / Device Role / Timing Role: Front-end TVS on main 12V input before buck converter stage. Use Value: Withstands 6600W peak power without derating at TC = +125°C, ensuring protection integrity in sealed enclosures. |
Use Scenario: Safeguards image sensor and SerDes power rails against fast transients induced by nearby motor actuation (e.g., mirror adjustment). IC Role / Device Role / Timing Role: Low-capacitance (typ. 36pF at 0V) TVS on 3.3V camera core supply. Use Value: Clamps to 29.2V within nanoseconds while adding negligible signal distortion to high-speed pixel data paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Lower peak power (400W), SMA package, RθJC not specified, no AEC-Q101 qualification | Suitable only for non-automotive, low-energy board-level ESD; cannot handle ISO16750-2 load-dump | Select only for cost-sensitive consumer electronics with sub-100A surge requirements |
| SMCJ18A | Higher peak power (1500W), SMC package, RθJC ≈ 2.5°C/W, AEC-Q101 qualified but lower IPP (123A vs. 226A) | Meets ISO7637-2 Pulse 1/2a/3b but insufficient for full load-dump (Pulse 5a/b) in 12V systems | Choose when space constraints prevent DO-218 mounting but full 6600W capability is not required |
Compared with SMAJ18A and SMCJ18A, DM8W18AQ-13 delivers 4.4× higher peak power than SMCJ18A and 16.5× more than SMAJ18A, enabling single-device protection against full automotive load-dump events while maintaining AEC-Q101 compliance and 0.9°C/W thermal performance.
Availability
DM8W18AQ-13 is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment head units, and ADAS camera power supplies requiring stable component supply across automotive production lifecycles.
Supply support for DM8W18AQ-13 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 DM8W series belongs to Diodes' automotive-qualified TVS portfolio, engineered specifically to meet stringent ISO16750-2 and ISO7637-2 surge immunity requirements for 12V vehicle electrical systems.
FAQ
What is the maximum clamping voltage of DM8W18AQ-13 at rated peak pulse current?
The maximum clamping voltage is 29.2V at 226A peak pulse current (IPP) under the 10/1000µs waveform condition. This value is measured with the device mounted on a standard test fixture per JEDEC standards and reflects worst-case voltage seen by protected circuitry during surge events.
Is DM8W18AQ-13 suitable for bidirectional surge protection?
No - DM8W18AQ-13 is a unidirectional TVS diode with anode-connected heatsink. It conducts only during positive transients relative to the cathode. For bidirectional protection (e.g., data lines), a symmetric dual-diode configuration or dedicated bidirectional TVS like DM8W18CAQ-13 would be required.
How does the DO-218 package affect thermal performance in real-world PCB layouts?
The DO-218 (Type E) package requires direct thermal coupling of the anode heatsink tab to ≥250 mm² of 2-oz copper or an external metal chassis. Without this, RθJC degrades from 0.9°C/W to >5°C/W, risking thermal runaway during repeated surges. The recommended pad layout includes thermal vias under the tab per Diodes' package outline AN-4001.
Does DM8W18AQ-13 meet RoHS and halogen-free requirements?
Yes - it carries matte tin lead-free plating, complies with EU RoHS 2015/863/EU (RoHS 3), and is classified as "Green" per Diodes' definition: <900ppm bromine, <900ppm chlorine, and <1000ppm antimony compounds. Full compliance documentation is available in Diodes' Product Definitions library.
DM8W18AQ-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-218AB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 226A
- 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
DM8W18AQ-13 FAQ
1.How can I place an order for DM8W18AQ-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DM8W18AQ-13 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 DM8W18AQ-13 reliable?
The price and inventory of DM8W18AQ-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM8W18AQ-13 is usually 5 days.
3.What payment methods are accepted for DM8W18AQ-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM8W18AQ-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM8W18AQ-13?
DM8W18AQ-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM8W18AQ-13 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 DM8W18AQ-13?
For technical support, including DM8W18AQ-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM8W18AQ-13 requirements.
6.How does Aetrix verify that DM8W18AQ-13 is sourced from the original manufacturer or authorized distributors?
All DM8W18AQ-13 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 DM8W18AQ-13 meets industry standards.
7.What is the process for return or replacement of DM8W18AQ-13?
All DM8W18AQ-13 units undergo pre-shipment inspection (PSI). If there is an issue with DM8W18AQ-13, 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 DM8W18AQ-13 part is unused and in its original packaging.
Return procedure for DM8W18AQ-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM8W18AQ-13 Tags
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