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Diodes Incorporated DM8W40A-13
- Part No.:
- DM8W40A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
DM8W40A-13.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218
- Quantity:
- Payment:
- Shipping:
Inventory:8,246
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Product details
Overview
DM8W40A-13 from Diodes Incorporated is a unidirectional surface-mount transient voltage suppressor (TVS) designed for automotive load dump and ISO 7637-2 surge protection in high-reliability power rail applications. It delivers 6600W peak pulse power (10/1000µs), clamps at 64.5V max under 102A peak pulse current, and operates up to +175°C junction temperature - deployed in engine control units, battery management systems, and ADAS power supplies.
For engineers reviewing the DM8W40A-13 datasheet, DM8W40A-13 pinout, DM8W40A-13 application, or DM8W40A-13 equivalent, key selection criteria include its DO-218 package thermal resistance (RθJC = 0.9°C/W), ISO 16750-2 Pulse A/B compliance, unidirectional polarity, and 40V reverse standoff voltage with 44.4–49.1V breakdown range.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp transient overvoltages on DC power lines. Its DO-218 (Type E) package enables low-inductance, high-current surge handling with heatsink-anode polarity and 2.74g mass for stable thermal coupling to PCB copper.
It meets automotive-grade reliability per AEC-Q standards, supports 8.3ms half-sine IFSM = 700A surges, and derates linearly above +25°C case temperature - maintaining 5200W capability at TC = +125°C per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 6600W (10/1000µs waveform); sustains single-event load dump transients without failure |
| Reverse Standoff Voltage | 40V; blocks normal 12V/24V automotive battery operation while remaining inactive |
| Breakdown Voltage | 44.4–49.1V @ 5mA; ensures reliable turn-on before downstream IC damage thresholds |
| Clamping Voltage | 64.5V @ 102A; limits voltage seen by protected circuit during worst-case surge |
| Junction Temperature Range | −55°C to +175°C; validated for under-hood ECU and power module environments |
| Thermal Resistance | RθJC = 0.9°C/W; enables efficient heat transfer to heatsink or large copper pour |
| Surge Standards | ISO 16750-2 (Pulse A/B), ISO 7637-2 (Pulse 1, 2a, 3a, 3b); certified for OEM automotive qualification |
Pinout & Package
Package: DO-218 (Type E), molded plastic UL 94V-0 housing with matte tin-plated terminals. Anode is connected to heatsink tab; cathode marked by bar symbol on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Current return path and thermal interface | Must be soldered to ≥200mm² copper area for RθJC spec compliance and 700A surge conduction |
| Cathode (Top Surface Pin) | Transient voltage sensing and clamping node | Connected to protected line (e.g., B+ input); polarity-sensitive - reverse connection disables protection |
Key Features
| Feature | Design Value |
|---|---|
| 6600W Peak Pulse Power | Handles full ISO 16750-2 load dump energy (≥1000V, 10ms exponential) without degradation |
| 175°C Junction Rating | Enables placement near high-power MOSFETs or DC-DC converters without thermal derating penalties |
| Unidirectional Polarity | Optimized for DC supply rail protection only - avoids leakage issues in bidirectional signal lines |
| Lead-Free & Halogen-Free | Meets RoHS 3 and automotive green requirements (<900ppm Br/Cl, <1000ppm Sb) |
| AEC-Q Qualified | Validated per JEDEC stress tests for automotive electronics - no separate qualification needed |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Battery Management System (BMS) |
|---|---|
Use Scenario: Protects microcontroller and CAN transceiver power rails from alternator load dump spikes during battery disconnection. IC Role / Device Role / Timing Role: Primary clamping device on 12V main input; activates within nanoseconds of overvoltage onset. Use Value: Limits voltage to ≤64.5V during 102A surge, preventing latch-up or gate oxide rupture in downstream PMICs. |
Use Scenario: Shields cell monitoring ICs and isolation amplifiers from transients induced by high-current contactor switching. IC Role / Device Role / Timing Role: Front-end transient suppressor on BMS main supply; coordinates with upstream fuse and downstream LC filter. Use Value: Absorbs 6600W surge energy without parameter shift, preserving measurement accuracy across 1000+ cycles. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Guards image sensor and SerDes power supply against ignition noise and jump-start surges in front-facing camera assemblies. IC Role / Device Role / Timing Role: Fast-response TVS placed immediately after input connector; complements ceramic bypass capacitors. Use Value: Clamps sub-100ns transients to safe levels, eliminating pixel corruption and frame loss during road vibration events. |
Use Scenario: Safeguards motor driver ICs and position sensors from inductive kickback when EPS motor commutates at high torque. IC Role / Device Role / Timing Role: High-energy snubber on 48V auxiliary rail; thermally coupled to aluminum heatsink via anode tab. Use Value: Maintains 0.9°C/W thermal path to sustain repeated 700A surge capability without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A | Lower PPK = 600W; DO-214AA package; RθJC ≈ 35°C/W | Not suitable for load dump; limited to ISO 7637-2 Pulse 1/2a only | Select only for cost-sensitive non-automotive 12V systems with <100A surge exposure |
| SMCJ40A | PPK = 1500W; DO-214AB package; RθJC ≈ 12°C/W; lower IFSM = 200A | Acceptable for mid-tier automotive modules but fails ISO 16750-2 Pulse B validation | Use where space allows larger footprint and thermal budget permits higher junction rise |
Compared with SMBJ40A and SMCJ40A, DM8W40A-13 uniquely supports full automotive load dump immunity (6600W, 700A) in a thermally optimized DO-218 package - making it the only option qualified for front-end protection in engine bay ECUs and EPS controllers.
Availability
DM8W40A-13 is available at Aetrix Electronics and suitable for automotive power distribution, battery management, ADAS camera modules, and electric power steering systems requiring stable component supply across multi-year production programs.
Supply support for DM8W40A-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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive and industrial markets.
DM8W40A-13 belongs to Diodes' automotive-qualified TVS portfolio targeting ISO 16750-2 and ISO 7637-2 compliance - engineered specifically for under-hood power rail protection where thermal robustness and surge margin are critical.
FAQ
What is the maximum clamping voltage of DM8W40A-13 at rated peak pulse current?
The maximum clamping voltage is 64.5V at 102A peak pulse current (10/1000µs waveform), measured per test condition in DS40428 Rev. 7-2 Section 3. This value ensures downstream 75V-rated components remain within safe operating area during worst-case load dump events.
Can DM8W40A-13 be used in bidirectional signal lines like CAN or LIN buses?
No - DM8W40A-13 is unidirectional only, with anode tied to heatsink and cathode as the active terminal. Bidirectional protection requires symmetrical TVS arrays (e.g., D3V3F4U) or dedicated bidirectional devices; using this part on signal lines risks forward conduction and data corruption.
How does the DO-218 package improve thermal performance over standard SMC packages?
The DO-218 (Type E) package features a large metal heatsink tab directly bonded to the silicon die, achieving RθJC = 0.9°C/W - over 12× better than typical SMC packages (~12°C/W). This allows sustained 700A surge conduction without exceeding +175°C junction limit when mounted on ≥200mm² copper.
Is there an automotive-qualified version of DM8W40A-13 with extended temperature screening?
Yes - the DM8W40AQ-13 is the AEC-Q200 qualified variant, manufactured under automotive-specific process controls and tested across −40°C to +125°C ambient with additional HTOL and temperature cycling validation. It shares identical electrical specs and DO-218 packaging but carries distinct automotive traceability and lot documentation.
DM8W40A-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
DM8W40A-13 FAQ
1.How can I place an order for DM8W40A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DM8W40A-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 DM8W40A-13 reliable?
The price and inventory of DM8W40A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM8W40A-13 is usually 5 days.
3.What payment methods are accepted for DM8W40A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM8W40A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM8W40A-13?
DM8W40A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM8W40A-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 DM8W40A-13?
For technical support, including DM8W40A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM8W40A-13 requirements.
6.How does Aetrix verify that DM8W40A-13 is sourced from the original manufacturer or authorized distributors?
All DM8W40A-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 DM8W40A-13 meets industry standards.
7.What is the process for return or replacement of DM8W40A-13?
All DM8W40A-13 units undergo pre-shipment inspection (PSI). If there is an issue with DM8W40A-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 DM8W40A-13 part is unused and in its original packaging.
Return procedure for DM8W40A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM8W40A-13 Tags
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