My Inquiry
My Account
Diodes Incorporated DM8W18A-13
- Part No.:
- DM8W18A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
DM8W18A-13.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO218
- Quantity:
- Payment:
- Shipping:
Inventory:6,828
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DM8W18A-13 from Diodes Incorporated is a unidirectional surface-mount transient voltage suppressor (TVS) designed for automotive load dump and ISO 7637-2 surge protection. It delivers 6600W peak pulse power at 10/1000µs, features a 18V reverse standoff voltage (VRWM), clamps to ≤29.2V at 226A peak pulse current, and operates from –55°C to +175°C - deployed in engine control units and battery management systems.
For engineers reviewing the DM8W18A-13 datasheet, DM8W18A-13 pinout, DM8W18A-13 application, or DM8W18A-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 8W steady-state power dissipation at TC = +25°C.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp high-energy transients, with a specified breakdown voltage range of 20.0–22.1V at 5mA test current. Its low clamping ratio (VC/VBR ≈ 1.34) ensures rapid voltage limiting during load dump events.
The device is thermally optimized for high-power dissipation: junction-to-case thermal resistance is 0.9°C/W, enabling effective heat transfer to the PCB heatsink pad. Polarity is fixed - anode connects to heatsink, cathode marked by bar - and it is qualified per AEC-Q standards for automotive reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 6600W (10/1000µs waveform); sustains automotive load dump surges without failure |
| Reverse Standoff Voltage | 18V (VRWM); blocks normal battery voltage (13.5V nominal) while remaining inactive |
| Clamping Voltage | ≤29.2V at 226A IPP; limits downstream IC voltage to safe levels during surge |
| Breakdown Voltage | 20.0–22.1V @ 5mA; defines precise avalanche initiation threshold |
| Junction Temp Range | –55°C to +175°C; supports under-hood deployment in modern ICE and EV powertrain modules |
| Thermal Resistance | RθJC = 0.9°C/W; enables efficient conduction cooling via PCB copper pour or heatsink |
| Steady-State Power | 8.0W @ TC = +25°C; sets continuous power handling limit when mounted on thermal pad |
Pinout & Package
Package: DO-218 (Type E), molded plastic body with UL 94V-0 flammability rating; heatsink tab serves as anode terminal; cathode identified by bar marking; weight ≈2.74g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Current entry point during clamping | Primary thermal path; must be soldered to ≥100mm² copper area for rated power handling |
| Cathode (Bar-marked Lead) | Current exit point during clamping | Connected to protected line (e.g., 12V rail); defines unidirectional surge path to ground |
Key Features
| Feature | Design Value |
|---|---|
| 6600W Peak Pulse Power | Meets ISO 16750-2 Load Dump (Pulse 5a) with margin; eliminates need for series impedance |
| TJ = +175°C Operation | Enables placement near high-temp sources (e.g., alternator, DC-DC converters) without derating |
| DO-218 Thermal Performance | RθJC = 0.9°C/W allows >8W continuous dissipation with minimal case temperature rise |
| Automotive-Qualified Reliability | AEC-Q200 stress-tested; compliant with ISO 7637-2 Pulse 1, 2a, 3a, 3b for ECU robustness |
| Lead-Free & Halogen-Free | RoHS 3 and "Green" certified (<900ppm Br/Cl, <1000ppm Sb); suitable for global automotive supply chains |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller power rails against alternator load dump surges during battery disconnect. IC Role / Device Role: Unidirectional TVS clamping element placed between 12V input and ground. Use Value: Limits voltage to ≤29.2V during 6600W transient, preventing latch-up or gate oxide damage in 3.3V/5V LDOs and MCUs. |
Use Scenario: Shields LIN bus transceivers and window motor drivers from ISO 7637-2 Pulse 2a (inductive switch-off). IC Role / Device Role: Primary overvoltage protection on 12V supply rail upstream of local regulators. Use Value: Withstands 700A IFSM surge without degradation, ensuring long-term reliability in door module assemblies. |
| Battery Management System (BMS) | ADAS Camera Power Supply |
Use Scenario: Guards front-end monitoring ICs (e.g., fuel gauge, cell voltage sensors) from jump-start transients. IC Role / Device Role: High-energy clamping device on main battery input before DC-DC conversion stage. Use Value: 175°C max junction temperature enables direct mounting on BMS PCB near high-current traces without thermal throttling. |
Use Scenario: Secures 12V input to image sensor power management ICs in rear-view or surround-view cameras. IC Role / Device Role: First-line transient suppression before low-noise LDOs powering CMOS image sensors. Use Value: Low clamping voltage (29.2V) prevents overvoltage-induced pixel saturation or analog front-end reset during ignition events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Lower PPK (400W), DO-214AC package, RθJC ≈ 50°C/W | Not suitable for load dump; limited to ISO 7637-2 Pulse 1/3 only | Select only for cost-sensitive non-automotive 12V circuits with <500W surge exposure |
| SMCJ18A | PPK = 1500W, DO-214AB package, RθJC ≈ 15°C/W | Handles Pulse 2a/3 but fails ISO 16750-2 Pulse 5a due to insufficient energy rating | Use where board space permits larger footprint and thermal design supports lower power density |
Compared with SMAJ18A and SMCJ18A, DM8W18A-13 uniquely satisfies full ISO 16750-2 load dump requirements in a surface-mount DO-218 package, delivering 4.4× more peak power than SMCJ18A and enabling single-device protection without external series impedance.
Availability
DM8W18A-13 is available at Aetrix Electronics and suitable for engine control units, battery management systems, and ADAS camera power supplies requiring stable component supply across automotive production lifecycles.
Supply support for DM8W18A-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.
DM8W18A-13 belongs to Diodes' automotive-grade TVS portfolio, engineered specifically to meet ISO 16750-2 and ISO 7637-2 surge immunity requirements in harsh under-hood environments.
FAQ
What is the maximum clamping voltage of DM8W18A-13 at rated peak pulse current?
The maximum clamping voltage (VC) is 29.2V at 226A peak pulse current under 10/1000µs waveform conditions, measured per JEDEC-standard test methods. This value is guaranteed across the full operating temperature range (–55°C to +175°C) and ensures downstream 3.3V/5V logic remains within safe absolute maximum ratings during surge events.
Can DM8W18A-13 be used in bidirectional configurations?
No - DM8W18A-13 is unidirectional only, with anode tied to the heatsink tab and cathode marked by a bar. It conducts only during reverse-biased surges. For bidirectional protection (e.g., data lines), separate devices such as P6SMB18CA or dedicated dual-rail TVS arrays must be used; this part lacks symmetrical breakdown characteristics.
How does the DO-218 package improve thermal performance over standard SMB/SMA packages?
The DO-218 (Type E) package features an integrated metal heatsink tab that provides direct thermal conduction to the PCB, achieving RθJC = 0.9°C/W - over 50× better than SMAJ18A (≈50°C/W). This allows sustained 8W power dissipation at TC = +25°C and enables reliable operation in high-ambient under-hood locations without forced airflow.
Is DM8W18A-13 compliant with AEC-Q200 for automotive use?
Yes - DM8W18A-13 is qualified to AEC-Q200 Rev D stress test requirements for passive components, including temperature cycling, humidity bias, and surge testing. It is also explicitly certified to ISO 16750-2 (Pulse A/B) and ISO 7637-2 (Pulse 1, 2a, 3a, 3b), making it suitable for Tier-1 automotive ECU designs without additional qualification.
DM8W18A-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
DM8W18A-13 FAQ
1.How can I place an order for DM8W18A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DM8W18A-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 DM8W18A-13 reliable?
The price and inventory of DM8W18A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM8W18A-13 is usually 5 days.
3.What payment methods are accepted for DM8W18A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM8W18A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM8W18A-13?
DM8W18A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM8W18A-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 DM8W18A-13?
For technical support, including DM8W18A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM8W18A-13 requirements.
6.How does Aetrix verify that DM8W18A-13 is sourced from the original manufacturer or authorized distributors?
All DM8W18A-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 DM8W18A-13 meets industry standards.
7.What is the process for return or replacement of DM8W18A-13?
All DM8W18A-13 units undergo pre-shipment inspection (PSI). If there is an issue with DM8W18A-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 DM8W18A-13 part is unused and in its original packaging.
Return procedure for DM8W18A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM8W18A-13 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
