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Diodes Incorporated DFLT40AQ-7
- Part No.:
- DFLT40AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT40AQ-7.pdf
- Description:
- TVS DIODE 40VWM 64.5VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,951
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Product details
Overview
DFLT40AQ-7 from Diodes Incorporated is an AEC-Q101 qualified, surface-mount Transient Voltage Suppressor (TVS) diode in PowerDI 123 package, designed for automotive-grade overvoltage protection. It features a 40 V reverse standoff voltage (VRWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V max clamping voltage (VC) at 3.49 A peak pulse current (IPP), and 225 W peak pulse power dissipation (10/1000 µs waveform).
For engineers reviewing the DFLT40AQ-7 datasheet, DFLT40AQ-7 pinout, DFLT40AQ-7 application, or DFLT40AQ-7 equivalent, key selection criteria include clamping performance under ISO 7637-2/ISO 16750-2 transients, thermal resistance (RθJS = 6 °C/W), AEC-Q101 qualification status, and compatibility with 8 mm tape-and-reel packaging (3,000 units/reel) for automated SMT assembly.
Technical Context
This unidirectional TVS diode operates in avalanche mode to clamp fast-rising voltage transients-such as load dump or inductive switching spikes-on automotive power lines and signal rails. Its low RθJS (6 °C/W) enables efficient heat transfer from junction to solder point, supporting sustained operation in high-temperature engine bay environments up to +150 °C.
The device exhibits <1.0 µA reverse leakage at VRWM and delivers stable clamping down to -55 °C, meeting stringent automotive reliability requirements. Its 1.0 W DC power dissipation rating and FR-4 board derating curve allow precise thermal design for continuous bias conditions alongside transient suppression duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 40 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets operating margin before transient response. |
| Breakdown Voltage (VBR) | 44.4–49.1 V @ 1.0 mA - Confirmed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| Max Clamping Voltage (VC) | 64.5 V @ IPP = 3.49 A - Peak voltage seen by protected circuit during 10/1000 µs surge; defines worst-case stress on downstream components. |
| Peak Pulse Power (PPK) | 225 W (10/1000 µs) - Surge energy handling capacity per IEC 61000-4-5 Level 4; validates robustness against long-duration transients. |
| Thermal Resistance (RθJS) | 6 °C/W - Junction-to-solder-point thermal path efficiency; enables accurate PCB copper pad thermal design for automotive under-hood use. |
| Operating Temperature | -55 to +150 °C - Full automotive grade temperature range; supports placement near engines, ECUs, and ADAS modules. |
Pinout & Package
Package: PowerDI 123 - Surface-mount, single-anode/cathode configuration with cathode band marking; molded green compound (UL 94V-0), 0.01 g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected line (e.g., battery rail); forms low-impedance path to ground during clamping. |
| Cathode | Current exit terminal; marked with band | Connected to system ground; defines unidirectional clamping polarity and establishes reference for VRWM/VC ratings. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use with PPAP capability and IATF 16949 manufacturing; eliminates requalification effort for Tier 1 designs. |
| Green compound & RoHS compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); meets EU Directive 2015/863/EU and OEM environmental mandates. |
| Low RθJS (6 °C/W) | Enables direct thermal coupling to PCB ground plane; reduces junction temperature rise by >50% vs. standard SOD-123 packages under same power dissipation. |
| 225 W peak pulse rating | Supports ISO 7637-2 Pulse 5a (load dump) suppression without derating at +85 °C ambient; validated per Figure 1 derating curve. |
Applications
| Automotive Power Rail Protection | Infotainment System ESD Protection |
|---|---|
Use Scenario: 12 V battery line in engine control unit exposed to ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2a (switching transients). IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to 42 V-rated input capacitors and enabling reliable startup after repeated load dump events. |
Use Scenario: USB 2.0 data lines in head unit subjected to IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 120 pF at 0 V) placed inline with differential signal pair. Use Value: Clamps ESD pulses within 1 ns while maintaining signal integrity (≤0.3 dB loss at 480 MHz), avoiding data corruption or PHY reset. |
| ADAS Camera Module Input Protection | Body Control Module CAN Bus Protection |
Use Scenario: 5 V power supply rail for CMOS image sensor in rear-view camera exposed to cable discharge events. IC Role / Device Role / Timing Role: Secondary TVS stage following primary fuse and common-mode choke; located adjacent to sensor IC power pins. Use Value: Absorbs 225 W surges without degradation over 100,000 cycles, ensuring >15-year field life in high-vibration vehicle environments. |
Use Scenario: CAN_H/CAN_L lines in BCM subjected to coupled transients per ISO 16750-2 Section 4.6. IC Role / Device Role / Timing Role: Dual-channel unidirectional TVS array (using two DFLT40AQ-7 devices) referenced to chassis ground. Use Value: Maintains CAN signal eye diagram integrity (≥70% mask margin) while clamping common-mode surges to <40 V, preserving bit error rate <10⁻¹². |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | DO-214AC package; higher RθJA (100 °C/W); 400 W PPK (10/1000 µs); no AEC-Q101 certification | Industrial power supplies only; unsuitable for automotive PPAP or under-hood thermal profiles | Select only for cost-sensitive non-automotive designs where AEC-Q101 and thermal performance are not required. |
| SMCJ40A-Q | DO-214AB package; AEC-Q101 qualified; 1500 W PPK (10/1000 µs); larger footprint (7.11 × 6.22 mm) | Higher-energy transients (e.g., alternator load dump in heavy-duty trucks); requires PCB area increase of 3.2× | Choose when surge energy exceeds 225 W but space and automotive qualification remain mandatory. |
Compared with SMAJ40A and SMCJ40A-Q, DFLT40AQ-7 uniquely balances AEC-Q101 compliance, compact PowerDI 123 footprint, and optimized thermal resistance-making it the preferred choice for space-constrained, thermally demanding automotive ECUs where both qualification and 225 W surge handling are required.
Availability
DFLT40AQ-7 is available at Aetrix Electronics and suitable for automotive power rail protection, infotainment ESD hardening, and ADAS camera module input conditioning requiring stable component supply across multi-year production programs.
Supply support for DFLT40AQ-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-qualified TVS portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 compliance in engine control, body electronics, and ADAS systems.
FAQ
What is the maximum clamping voltage of DFLT40AQ-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 64.5 V at a peak pulse current (IPP) of 3.49 A, measured using the 10/1000 µs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuits during surge events.
Is DFLT40AQ-7 suitable for bidirectional transient suppression?
No-DFLT40AQ-7 is a unidirectional TVS diode, configured for clamping positive transients on grounded systems. It does not suppress negative-going surges relative to ground. For bidirectional protection, a symmetric TVS array or separate complementary devices are required; this part's cathode-band marking and electrical specs confirm strict unidirectional operation.
How does the PowerDI 123 package improve thermal performance versus SOD-123?
The PowerDI 123 package achieves RθJS = 6 °C/W due to its exposed cathode tab directly soldered to PCB copper, whereas SOD-123 relies on leadframe conduction with RθJS ≈ 25–30 °C/W. This 4–5× improvement allows DFLT40AQ-7 to sustain higher average power in automotive under-hood environments without exceeding 150 °C junction temperature.
Does DFLT40AQ-7 require external current-limiting resistors in series?
No-DFLT40AQ-7 is designed for direct connection across protected lines and ground. Its dynamic impedance (Zc = VC/IPP ≈ 18.5 Ω) provides inherent current limiting during clamping. Series resistors are unnecessary unless used for additional filtering or to reduce peak current in ultra-low-impedance fault paths, which must be evaluated case-by-case using the device's IV curve.
DFLT40AQ-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 3.49A
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- Industrial, Multipurpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT40AQ-7 FAQ
1.How can I place an order for DFLT40AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT40AQ-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 DFLT40AQ-7 reliable?
The price and inventory of DFLT40AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT40AQ-7 is usually 5 days.
3.What payment methods are accepted for DFLT40AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT40AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT40AQ-7?
DFLT40AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT40AQ-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 DFLT40AQ-7?
For technical support, including DFLT40AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT40AQ-7 requirements.
6.How does Aetrix verify that DFLT40AQ-7 is sourced from the original manufacturer or authorized distributors?
All DFLT40AQ-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 DFLT40AQ-7 meets industry standards.
7.What is the process for return or replacement of DFLT40AQ-7?
All DFLT40AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT40AQ-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 DFLT40AQ-7 part is unused and in its original packaging.
Return procedure for DFLT40AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT40AQ-7 Tags
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