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Diodes Incorporated DFLT18AQ-7
- Part No.:
- DFLT18AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT18AQ-7.pdf
- Description:
- TVS DIODE 18VWM 29.2VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
DFLT18AQ-7 from Diodes Incorporated is an AEC-Q101 qualified, surface-mount Transient Voltage Suppressor (TVS) diode in PowerDI 123 package, designed for automotive electronics protection. It features 18 V reverse standoff voltage, 29.2 V max clamping voltage at 7.71 A peak pulse current, and 225 W peak pulse power (10/1000 µs waveform), deployed in CAN bus and LIN interface ESD protection circuits.
For engineers reviewing the DFLT18AQ-7 datasheet, DFLT18AQ-7 pinout, DFLT18AQ-7 application, or DFLT18AQ-7 equivalent, key selection criteria include clamping voltage margin vs. system rail, IPP capability under ISO 7637-2 pulse 5a/b, thermal resistance (RθJS = 6 °C/W), and AEC-Q101 qualification status for under-hood deployment.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode to clamp transient overvoltages above its 18 V standoff threshold. Its low RθJS of 6 °C/W enables effective heat transfer from junction to PCB cathode pad, supporting sustained surge handling in compact automotive modules.
It delivers 225 W peak pulse power under 10/1000 µs waveform and maintains <1 µA reverse leakage at VRWM, ensuring minimal standby current draw in always-on vehicle networks like body control modules and sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 18 V - Maximum continuous DC operating voltage before clamping initiates |
| Max Clamping Voltage (VC) | 29.2 V @ 7.71 A - Peak voltage seen by protected circuit during ISO 7637-2 pulse 5a |
| Peak Pulse Power (PPK) | 225 W (10/1000 µs) - Sustains automotive load dump transients without failure |
| Junction-to-Solder Point RθJS | 6 °C/W - Enables direct thermal path to PCB copper, critical for high-reliability under-hood use |
| AEC-Q101 Qualified | Yes - Validated for automotive temperature cycling, humidity, and mechanical shock per standard |
| Package | PowerDI 123 - Surface-mount, single-cathode-band marking, 0.01 g weight, JEDEC-compliant footprint |
Pinout & Package
Package: PowerDI 123 - Molded green plastic case, UL 94V-0 rated, cathode band marked on top surface, matte tin annealed terminals solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; forms clamping loop with cathode |
| Cathode | Protected line connection | Connected to signal/power line being safeguarded (e.g., CAN_H); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| 225 W peak pulse rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a energy requirements for 12 V automotive systems |
| RθJS = 6 °C/W | Enables >85% of surge energy dissipation directly into PCB copper, reducing junction temperature rise |
| AEC-Q101 qualification & PPAP capability | Supports Tier-1 automotive BOM release with full change control and process traceability |
| Halogen- and antimony-free "Green" construction | Complies with EU Directive 2015/863/EU and OEM environmental material declarations |
Applications
| Automotive CAN Bus Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines against ESD (IEC 61000-4-2) and coupled transients from alternator load dump. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between signal line and chassis ground. Use Value: Limits voltage excursion to ≤29.2 V during 7.71 A transient, preserving CAN transceiver integrity without adding capacitance-induced signal distortion. |
Use Scenario: Safeguarding 12 V supply input of BCM against ISO 7637-2 Pulse 5a (load dump) and Pulse 1 (inductive switch-off). IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, upstream of DC-DC converter input. Use Value: Absorbs 225 W surge energy while maintaining <1 µA leakage, preventing false wake-up or brownout in always-on microcontroller domains. |
| Passive Entry Key Fob Receiver | Automotive LIN Bus Node |
Use Scenario: Shielding RF receiver front-end from ESD events during user handling of key fobs. IC Role / Device Role / Timing Role: Low-capacitance TVS on antenna feedline or LNA bias line. Use Value: Adds only ~15 pF capacitance at 0 V (per Fig. 6), avoiding detuning of 315/433 MHz resonant circuits. |
Use Scenario: Protecting LIN transceiver pins against battery disconnect transients and ESD in door module nodes. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN bus line referenced to local ground. Use Value: Clamps to 29.2 V within nanoseconds, preventing latch-up in LIN ICs while meeting ISO 17987-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same VRWM (18 V), but higher VC = 29.7 V @ 7.5 A; RθJA = 125 °C/W vs. 120 °C/W | Lacks AEC-Q101 qualification and PPAP support; not certified for automotive production | Select when cost sensitivity outweighs automotive compliance requirements |
| SMCJ18A | Higher PPK = 1500 W (10/1000 µs), but larger DO-214AB package; VC = 29.2 V @ 51.4 A | Requires more PCB area; unsuitable for space-constrained modules like mirror ECUs or seat controllers | Select when surge energy exceeds 225 W and board space permits larger footprint |
Compared with SMAJ18A and SMCJ18A, DFLT18AQ-7 uniquely balances AEC-Q101 compliance, 225 W surge capacity, and PowerDI 123 miniaturization-making it optimal for volume automotive modules where qualification, thermal performance, and footprint are jointly constrained.
Availability
DFLT18AQ-7 is available at Aetrix Electronics and suitable for automotive CAN bus protection, body control module power input hardening, and LIN node transient suppression requiring stable component supply across multi-year vehicle production cycles.
Supply support for DFLT18AQ-7 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 the Americas.
The DFLT series is part of Diodes' automotive-grade TVS portfolio, engineered specifically for robust transient suppression in AEC-Q101–compliant vehicle subsystems including infotainment, ADAS sensors, and powertrain gateways.
FAQ
What is the maximum operating temperature range for DFLT18AQ-7?
The DFLT18AQ-7 is rated for operation from –55 °C to +150 °C, matching under-hood ambient conditions in modern vehicles. Its junction-to-solder-point thermal resistance of 6 °C/W ensures reliable thermal coupling to PCB copper, enabling sustained performance at elevated temperatures without derating below 125 °C ambient.
Does DFLT18AQ-7 meet ISO 7637-2 Pulse 5a requirements?
Yes. With a 225 W peak pulse rating (10/1000 µs) and clamping voltage of 29.2 V at 7.71 A, DFLT18AQ-7 satisfies ISO 7637-2 Pulse 5a test levels for 12 V systems. Its low RθJS supports repeated surge events without thermal runaway, validated per AEC-Q101 stress testing protocols.
How is polarity identified on the PowerDI 123 package?
Polarity is indicated by a molded cathode band on the top surface of the PowerDI 123 case. The cathode terminal connects to the protected line (e.g., CAN_H), while the anode connects to ground. This matches standard unidirectional TVS orientation and is confirmed in the mechanical drawings on page 4 of DS39043 Rev. 6-2.
Is DFLT18AQ-7 compatible with lead-free reflow profiles?
Yes. DFLT18AQ-7 uses matte tin-annealed terminals and is rated for moisture sensitivity level 1 per J-STD-020, supporting standard lead-free reflow profiles up to 260 °C peak. Its green molding compound meets UL 94V-0 flammability and halogen-free specifications per EU Directive 2015/863/EU.
DFLT18AQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- POWERDI®123
- 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):
- 7.71A
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT18AQ-7 FAQ
1.How can I place an order for DFLT18AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT18AQ-7 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 DFLT18AQ-7 reliable?
The price and inventory of DFLT18AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT18AQ-7 is usually 5 days.
3.What payment methods are accepted for DFLT18AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT18AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT18AQ-7?
DFLT18AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT18AQ-7 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 DFLT18AQ-7?
For technical support, including DFLT18AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT18AQ-7 requirements.
6.How does Aetrix verify that DFLT18AQ-7 is sourced from the original manufacturer or authorized distributors?
All DFLT18AQ-7 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 DFLT18AQ-7 meets industry standards.
7.What is the process for return or replacement of DFLT18AQ-7?
All DFLT18AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT18AQ-7, 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 DFLT18AQ-7 part is unused and in its original packaging.
Return procedure for DFLT18AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT18AQ-7 Tags
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