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Diodes Incorporated DM8W40AQ-13
- Part No.:
- DM8W40AQ-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
DM8W40AQ-13.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
DM8W40AQ-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 40 V reverse standoff voltage, 64.5 V max clamping voltage at 102 A peak pulse current, 6600 W 10/1000 µs peak pulse power, and operates from –55°C to +175°C. It is used in 12 V/24 V automotive power rails to protect ECUs, body control modules, and infotainment systems.
For engineers reviewing the DM8W40AQ-13 datasheet, DM8W40AQ-13 pinout, DM8W40AQ-13 application, or DM8W40AQ-13 equivalent, key selection criteria include clamping voltage under ISO16750-2 load-dump stress, thermal resistance (0.9 °C/W), DO-218 package mounting compatibility, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for high-energy transients. Its unidirectional configuration uses the heatsink as anode, enabling low-inductance mounting directly to chassis ground or heat spreaders. The device responds to 10/1000 µs surges with sub-100 ns turn-on time and maintains stable clamping performance up to TJ = +175°C.
It meets ISO 16750-2 Pulse A (battery disconnect) and Pulse B (load dump), plus ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a (supply interruption), and Pulse 3a/b (capacitive coupling). Its 0.9 °C/W RθJC enables effective thermal coupling to metal-core PCBs or heatsinks in high-power automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 40 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA; sets minimum system bus rating for 12 V/24 V automotive applications. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 5 mA test current; ensures predictable turn-on margin above VRWM. |
| VC @ Ipp | 64.5 V at 102 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress below 65 V during ISO16750-2 load dump. |
| PPK | 6600 W - Peak pulse power handling per 10/1000 µs waveform; supports full-load-dump energy without failure. |
| RθJC | 0.9 °C/W - Junction-to-case thermal resistance; enables direct heatsink mounting for sustained power dissipation up to 8 W at TC = +25°C. |
| TJ Range | –55°C to +175°C - Full operational temperature range; qualified per AEC-Q101 for under-hood ECU placement. |
Pinout & Package
Package: DO-218 (Type E), molded plastic case with UL 94V-0 flammability rating, 2.74 g mass, and matte tin lead-free plating. Heatsink serves as anode terminal; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Heatsink (Anode) | Anode connection | Primary current path for surge conduction; must be thermally coupled to PCB copper pour or external heatsink for RθJC = 0.9 °C/W performance. |
| Top Terminal (Cathode) | Cathode connection | Connected to protected line (e.g., battery rail); polarity indicator (bar) ensures correct orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| 6600 W peak pulse power | Withstands full ISO16750-2 load-dump events (up to 120 V, 10 ms exponential) without degradation when mounted to adequate thermal mass. |
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and surge lifetime testing per JEDEC standards. |
| Glass-passivated die | Eliminates wire bonds and enhances moisture resistance, enabling reliable operation in humid under-hood environments. |
| Lead-free & halogen-free | Complies with RoHS 3 (2015/863/EU) and Diodes Inc.'s "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb). |
Applications
| Engine Control Unit (ECU) Power Protection | Body Control Module (BCM) Input Protection |
|---|---|
Use Scenario: Protects 12 V supply input of engine management systems against alternator load-dump spikes up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamps transient overvoltage while maintaining low leakage (<15 µA at 40 V) during normal operation. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤64.5 V, preventing latch-up or gate oxide damage. | Use Scenario: Shields BCM power inputs from ISO 7637-2 Pulse 1 (inductive kickback) and Pulse 3b (ESD-coupled noise) in door module wiring harnesses. IC Role / Device Role / Timing Role: Fast-response silicon junction diverts >100 A surge current away from CAN transceivers and LIN drivers. Use Value: Maintains signal integrity by suppressing transients before they couple into low-voltage logic rails, reducing reset faults. |
| Infotainment System Power Rail | ADAS Camera Power Supply |
Use Scenario: Guards head unit main power input against repeated load-dump events during vehicle start-stop cycles. IC Role / Device Role / Timing Role: High-temperature stability (TJ = +175°C) ensures consistent clamping performance near hot engine compartments. Use Value: Prevents brownouts and memory corruption in SoCs by holding rail voltage within safe operating window during surges. | Use Scenario: Secures 12 V input of rear-view camera modules exposed to long cable runs and EMI in trunk harnesses. IC Role / Device Role / Timing Role: Low capacitance (<50 pF at 1 MHz, typical for DM8W40AQ) avoids signal distortion on adjacent video or GMSL lines. Use Value: Enables clean power delivery without degrading high-speed image data transmission or introducing timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPK (400 W), DO-214AC package, RθJC ≈ 45 °C/W, no AEC-Q101 qualification. | Suitable for non-automotive industrial power supplies; lacks thermal capability for sustained load-dump duty. | Select only for cost-sensitive, non-automotive designs where surge energy is limited and thermal management is less critical. |
| SMCJ40A | PPK = 1500 W, DO-214AB package, RθJC ≈ 12 °C/W, AEC-Q101 not claimed. | Acceptable for lower-energy ISO7637-2 Pulse 1/2a but insufficient for full ISO16750-2 load dump. | Use where space constraints prevent DO-218 mounting, but verify thermal derating and surge compliance per application test plan. |
Compared with SMAJ40A and SMCJ40A, DM8W40AQ-13 delivers 4.4× higher peak power and 50× lower thermal resistance-enabling robust, single-device protection for automotive load-dump without external heatsinking or parallel devices.
Availability
DM8W40AQ-13 is available at Aetrix Electronics and suitable for automotive ECU design, body electronics integration, and ADAS camera power conditioning requiring stable component supply across extended production lifecycles.
Supply support for DM8W40AQ-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 DM8WxxAQ series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for ISO16750-2 and ISO7637-2 compliance in harsh-temperature, high-reliability vehicle subsystems.
FAQ
What is the maximum clamping voltage of DM8W40AQ-13 under ISO16750-2 load-dump conditions?
The DM8W40AQ-13 clamps to 64.5 V at 102 A (10/1000 µs waveform), which covers the full ISO16750-2 Pulse B load-dump profile. Its thermal design allows it to sustain multiple load-dump events when mounted to ≥10 cm² of 2 oz copper with thermal vias, per Figure 2 in DS41002 Rev. 7.
Is DM8W40AQ-13 compatible with lead-free reflow soldering processes?
Yes. The device features matte tin lead-free plating and is rated for standard Pb-free reflow profiles (peak 260°C, 20–40 sec), compliant with J-STD-020 Level 1 moisture sensitivity. Its DO-218 package withstands thermal shock without delamination or parameter shift.
How does the DO-218 package improve surge handling versus smaller SMC or SMA packages?
The DO-218 (Type E) package provides 0.9 °C/W RθJC-over 40× better than SMAJ40A's ~45 °C/W-by using the entire heatsink surface as the anode. This enables direct thermal coupling to PCB ground planes or chassis, allowing full 6600 W surge energy dissipation without external heatsinks.
Does DM8W40AQ-13 meet AEC-Q101 requirements for automotive qualification?
Yes. Diodes Incorporated certifies DM8W40AQ-13 as AEC-Q101 qualified, PPAP-capable, and manufactured in IATF 16949 certified facilities. Qualification includes HTGB, HTRB, TCT, and surge lifetime testing per AEC-Q101-004, with full test reports available upon request.
DM8W40AQ-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 102A
- 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
DM8W40AQ-13 FAQ
1.How can I place an order for DM8W40AQ-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DM8W40AQ-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 DM8W40AQ-13 reliable?
The price and inventory of DM8W40AQ-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM8W40AQ-13 is usually 5 days.
3.What payment methods are accepted for DM8W40AQ-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM8W40AQ-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM8W40AQ-13?
DM8W40AQ-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM8W40AQ-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 DM8W40AQ-13?
For technical support, including DM8W40AQ-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM8W40AQ-13 requirements.
6.How does Aetrix verify that DM8W40AQ-13 is sourced from the original manufacturer or authorized distributors?
All DM8W40AQ-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 DM8W40AQ-13 meets industry standards.
7.What is the process for return or replacement of DM8W40AQ-13?
All DM8W40AQ-13 units undergo pre-shipment inspection (PSI). If there is an issue with DM8W40AQ-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 DM8W40AQ-13 part is unused and in its original packaging.
Return procedure for DM8W40AQ-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM8W40AQ-13 Tags
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