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Diodes Incorporated DM5W28AQ-13
- Part No.:
- DM5W28AQ-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
DM5W28AQ-13.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218
- Quantity:
- Payment:
- Shipping:
Inventory:7,288
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Product details
Overview
DM5W28AQ-13 from Diodes Incorporated is a 3600W surface-mount transient voltage suppressor (TVS) diode in DO-218 (Type E) package, designed for automotive load dump and ISO7637-2 surge protection. It features 28V reverse standoff voltage (VRWM), 31.1–34.4V breakdown voltage (VBR), 45.4V clamping voltage (VC) at 79A peak pulse current, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the DM5W28AQ-13 datasheet, DM5W28AQ-13 pinout, DM5W28AQ-13 application, or DM5W28AQ-13 equivalent, key selection criteria include clamping performance under 10/1000µs surges, thermal resistance (RθJC = 1.1°C/W), ISO16750-2 Pulse A/B compliance, and DO-218 polarity configuration with heatsink-as-anode topology.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds VRWM = 28V. Its low RθJC = 1.1°C/W enables effective heat transfer to the PCB heatsink, supporting sustained 5W average power dissipation at TC = +25°C and derated operation up to +175°C junction temperature.
The device meets ISO16750-2 Load Dump (Pulse A) and ISO7637-2 Pulse 1/2a/3a/3b requirements, with verified 3600W non-repetitive peak pulse power (10/1000µs) and 2800W (10/10000µs). Polarity is fixed: anode connected to heatsink, cathode as signal terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=5mA | 31.1–34.4 V - Breakdown threshold range ensuring reliable turn-on during transients |
| VC @ IPP=79A | 45.4 V - Clamped voltage limiting downstream circuit stress during 10/1000µs surge |
| PPK (10/1000µs) | 3600 W - Peak surge energy absorption capacity without failure |
| RθJC | 1.1 °C/W - Thermal resistance from junction to case, critical for heatsink design |
| TJ Range | −55 to +175 °C - Operating junction temperature range validated for engine bay use |
| IFSM | 500 A - Forward surge current rating for 8.3ms half-sine wave, supporting high-energy events |
Pinout & Package
Package: DO-218 (Type E), molded plastic body with UL 94V-0 flammability rating; heatsink tab serves as anode terminal; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Positive DC reference / GND return path | Electrically and thermally coupled to PCB copper pour; must be soldered to ≥250 mm² thermal pad |
| Cathode (Top-Side Lead) | Protected line input | Connected to sensitive circuit node (e.g., battery rail input to ECU); carries transient current to anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| 3600W Peak Pulse Power | Enables single-device protection against ISO16750-2 Load Dump (Pulse A) without series impedance |
| AEC-Q101 Qualified | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| Low RθJC = 1.1°C/W | Reduces thermal bottleneck between junction and heatsink, allowing higher sustained power handling |
| Lead-Free & Halogen-Free | RoHS 3 compliant (<900 ppm Br/Cl, <1000 ppm Sb); supports green manufacturing and end-of-life recycling |
| DO-218 Polarity Clarity | Heatsink-as-anode + cathode-bar marking eliminates assembly orientation errors in automated placement |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller power supply from 12V battery line transients during alternator load dump and cranking. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed directly at ECU input connector, shunting surge current to chassis ground via heatsink. Use Value: Limits clamped voltage to ≤45.4V, preventing overvoltage damage to 3.3V/5V LDOs and MCU I/O pins rated ≤40V absolute max. | Use Scenario: Safeguards BCM power domain against ISO7637-2 Pulse 1 (inductive switch-off) and Pulse 3b (capacitive discharge). IC Role / Device Role / Timing Role: Fast-response avalanche diode absorbing sub-microsecond spikes before they reach CAN transceivers and power management ICs. Use Value: Achieves <100 ns response time and holds clamping voltage below 50V, preserving 5V logic integrity and avoiding brownout resets. |
| ADAS Camera Module Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Shields image sensor and SerDes interface from battery rail noise during ignition and accessory load switching. IC Role / Device Role / Timing Role: Primary overvoltage protector located upstream of DC/DC converter, with heatsink tied to metal shield enclosure. Use Value: Maintains ≤45.4V clamping under 79A surge, ensuring stable 12V-to-3.3V conversion and preventing pixel corruption or frame loss. | Use Scenario: Guards H-bridge gate drivers and current sense amplifiers from motor back-EMF and load dump coupling. IC Role / Device Role / Timing Role: High-current TVS mounted on heatsink near motor connector, conducting >500A short-duration forward surges without degradation. Use Value: Withstands 500A IFSM (8.3ms), enabling robust protection without sacrificial fusing or redundant devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPK = 400W; SMA package; RθJC ≈ 50°C/W; no AEC-Q101 qualification | Not suitable for load dump; limited to ISO7637-2 Pulse 3 only; requires larger board area for thermal relief | Select only for cost-sensitive non-automotive 12V systems with <100A surge exposure |
| SMCJ28A-Q | PPK = 1500W; SMC package; AEC-Q101 qualified; RθJC ≈ 3.5°C/W; higher VC = 48.4V @ 65A | Meets ISO16750-2 Pulse B but not Pulse A; insufficient for full load dump protection | Use where space constraints prevent DO-218 mounting but AEC-Q101 is mandatory |
Compared with SMAJ28A and SMCJ28A-Q, DM5W28AQ-13 delivers 2.4× higher peak power and 3.2× lower thermal resistance, enabling direct load dump suppression in compact DO-218 layout-critical for modern automotive ECUs where space and thermal margin are tightly constrained.
Availability
DM5W28AQ-13 is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, body control module surge hardening, and electric power steering system resilience requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for DM5W28AQ-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200 and AEC-Q101 standards.
The DM5WxxAQ series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically to meet ISO16750-2 and ISO7637-2 surge immunity requirements in engine compartment and chassis-mounted electronics.
FAQ
What is the maximum clamping voltage of DM5W28AQ-13 under a 10/1000µs surge?
The maximum clamping voltage (VC) is 45.4 V at 79 A peak pulse current (IPP), measured per 10/1000 µs waveform per DS41000 Rev. 7–2. This value is guaranteed across −55°C to +175°C junction temperature and defines the upper voltage limit imposed on protected circuits during worst-case transients.
How should the heatsink tab be connected in PCB layout?
Heatsink tab is the anode terminal and must be soldered to a minimum 250 mm² copper pour connected to chassis ground or battery return. The tab provides both electrical conduction and primary thermal path; insufficient copper area causes junction overheating and premature failure under repeated surges.
Is DM5W28AQ-13 suitable for bidirectional surge protection?
No. DM5W28AQ-13 is a unidirectional TVS diode with anode-heatsink polarity. It conducts only during reverse-biased overvoltage events. For bidirectional protection (e.g., data lines), a separate symmetric TVS array or dual-diode configuration is required-this part is specified exclusively for DC power rail clamping.
Does DM5W28AQ-13 require external series impedance for safe operation?
No external series impedance is required for load dump protection. Its 3600W PPK rating and low RθJC allow direct connection between battery rail and protected IC input. However, a fuse or polyfuse may still be used upstream for fault isolation-this device is not a replacement for overcurrent protection.
DM5W28AQ-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 79A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218
DM5W28AQ-13 FAQ
1.How can I place an order for DM5W28AQ-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DM5W28AQ-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 DM5W28AQ-13 reliable?
The price and inventory of DM5W28AQ-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM5W28AQ-13 is usually 5 days.
3.What payment methods are accepted for DM5W28AQ-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM5W28AQ-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM5W28AQ-13?
DM5W28AQ-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM5W28AQ-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 DM5W28AQ-13?
For technical support, including DM5W28AQ-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM5W28AQ-13 requirements.
6.How does Aetrix verify that DM5W28AQ-13 is sourced from the original manufacturer or authorized distributors?
All DM5W28AQ-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 DM5W28AQ-13 meets industry standards.
7.What is the process for return or replacement of DM5W28AQ-13?
All DM5W28AQ-13 units undergo pre-shipment inspection (PSI). If there is an issue with DM5W28AQ-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 DM5W28AQ-13 part is unused and in its original packaging.
Return procedure for DM5W28AQ-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM5W28AQ-13 Tags
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