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Diodes Incorporated DFLT33AQ-7
- Part No.:
- DFLT33AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT33AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PDI
- Quantity:
- Payment:
- Shipping:
Inventory:8,800
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Product details
Overview
DFLT33AQ-7 from Diodes Incorporated is an AEC-Q101 qualified automotive-grade transient voltage suppressor (TVS) diode in PowerDI®123 package, designed for unidirectional overvoltage protection. It features a 33 V reverse standoff voltage, 53.3 V maximum clamping voltage at 4.22 A peak pulse current, and 225 W peak pulse power dissipation (10/1000 µs waveform), targeting CAN bus and LIN interface protection in engine control units.
For engineers reviewing the DFLT33AQ-7 datasheet, DFLT33AQ-7 pinout, DFLT33AQ-7 application, or DFLT33AQ-7 equivalent, key selection criteria include clamping performance under ISO 16750-2 surge conditions, thermal resistance (RθJS = 6 °C/W), AEC-Q101 qualification status, and compatibility with 8 mm tape-and-reel packaging for SMT assembly.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device, conducting when reverse transient voltage exceeds its 33 V standoff threshold to limit downstream circuit voltage to ≤53.3 V. Its low RθJS of 6 °C/W enables effective heat transfer from junction to solder point, supporting sustained operation in high-temperature under-hood environments up to +150 °C.
The device uses a planar junction structure with matte tin–annealed copper leadframe, delivering <1 µA reverse leakage at VRWM and 3.5 V forward voltage at 12 A surge. It meets IATF 16949 manufacturing requirements and is halogen/antimony-free per Diodes' "Green" definition (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 33 V - Maximum continuous reverse operating voltage before clamping initiates |
| Max Clamping Voltage (VC @ IPP) | 53.3 V @ 4.22 A - Peak voltage seen by protected circuit during 10/1000 µs surge |
| Peak Pulse Power (PPK) | 225 W - Surge energy handling capability per single 10/1000 µs transient |
| Junction-to-Solder Thermal Resistance | 6 °C/W - Enables efficient heat extraction to PCB copper pad under pulsed stress |
| Operating Temperature Range | −55 °C to +150 °C - Validated for under-hood automotive locations including ECU and body control modules |
| AEC-Q101 Qualification | Qualified - Meets stress test requirements for automotive discrete semiconductors |
| Package | PowerDI®123 - Surface-mount, 3-pin (cathode-banded), 0.01 g weight, JEDEC-compliant footprint |
Pinout & Package
DFLT33AQ-7 is housed in the PowerDI®123 package: a compact, thermally enhanced surface-mount outline with cathode band marking on top view. The case is molded green plastic (UL 94V-0), moisture sensitivity level 1, and terminals are matte tin–annealed copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to signal/power line being safeguarded (e.g., CAN_H); polarity-sensitive installation |
| Cathode Band | Visual polarity indicator | White or black band on top surface identifies cathode terminal; critical for correct orientation in layout |
Key Features
| Feature | Design Value |
|---|---|
| 225 W peak pulse power (10/1000 µs) | Supports robust protection against ISO 16750-2 Pulse 5a (load dump) and Pulse 1/2a (inductive switching) |
| RθJS = 6 °C/W | Enables reliable thermal performance without external heatsinking in space-constrained ECUs |
| AEC-Q101 qualification & PPAP capability | Meets automotive change control requirements for Tier 1 production release and long-term supply continuity |
| Halogen- and antimony-free "Green" construction | Complies with automotive OEM environmental specifications (e.g., Ford WSS-M99P9999-A1, GM GP-9) |
| Moisture Sensitivity Level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontroller power rails from load dump transients up to 35 V. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and GND, triggered within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to 53.3 V during 225 W surges, preventing damage to 3.3 V/5 V LDOs and MCU VDD pins. | Use Scenario: Safeguarding CAN FD physical layer transceivers (e.g., TCAN1042, SN65HVD256) against ESD and fast transients. IC Role / Device Role / Timing Role: Unidirectional clamp on CAN_H line referenced to ground, with low capacitance (<100 pF at 0 V bias). Use Value: Maintains signal integrity up to 5 Mbps while clamping EFT bursts (IEC 61000-4-4) to safe levels for transceiver I/O. |
| LIN Bus Node Protection | Body Control Module (BCM) Sensor Interface |
Use Scenario: Securing LIN slave nodes (e.g., door lock actuators, mirror controls) connected to 12 V vehicle bus. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA @ 33 V) TVS on LIN line, installed adjacent to connector entry point. Use Value: Prevents false wake-up and latch-up caused by coupled noise from alternator ripple or relay switching. | Use Scenario: Protecting analog sensor inputs (e.g., temperature, humidity, rain sensors) in BCM from cable-induced surges. IC Role / Device Role / Timing Role: Front-end clamping element on sensor signal line, paired with RC filter for EMI suppression. Use Value: Ensures ADC reference stability by limiting transient excursions to <53.3 V, avoiding input stage saturation or damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-Q | Same 33 V VRWM, but SMA package (RθJA = 150 °C/W vs. 6 °C/W); 400 W PPK rating | Higher thermal resistance limits use in high-ambient zones; requires larger PCB copper area for thermal management | Select when legacy SMA footprint is fixed and surge duty cycle is low |
| TPSMF33A | 33 V VRWM, 53.3 V VC, but SOD-123FL package; RθJS = 12 °C/W; AEC-Q101 qualified | Lower thermal performance than PowerDI123; slightly higher clamping impedance due to smaller die | Choose for cost-sensitive designs where 6 °C/W RθJS is not required and board space is extremely constrained |
Compared with SMAJ33A-Q and TPSMF33A, DFLT33AQ-7 delivers superior thermal performance (RθJS = 6 °C/W) and automotive-grade reliability in a compact PowerDI123 outline-making it optimal for high-density, high-temperature ECU and body electronics where surge repetition and thermal cycling are critical.
Availability
DFLT33AQ-7 is available at Aetrix Electronics and suitable for engine control units, CAN FD transceiver interfaces, and LIN bus node protection requiring stable component supply across automotive production lifecycles.
Supply support for DFLT33AQ-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 North America.
The DFLT series is part of Diodes' automotive-qualified TVS portfolio, engineered specifically for robust transient suppression in harsh-temperature vehicle subsystems-including powertrain, chassis, and body electronics-under ISO 16750 and AEC-Q101 requirements.
FAQ
What is the meaning of the "-7" suffix in DFLT33AQ-7?
The "-7" suffix indicates tape-and-reel packaging: 3,000 devices per 8 mm wide reel on 7-inch diameter spool. This is the standard automotive-grade shipping format per Diodes' ordering information table and complies with J-STD-020 moisture sensitivity level 1 handling requirements.
Does DFLT33AQ-7 support bidirectional transient suppression?
No. DFLT33AQ-7 is a unidirectional TVS diode, intended for DC-biased lines like power rails or single-ended data buses (e.g., CAN_H). It conducts only during reverse overvoltage events and does not protect against positive-going transients on grounded lines-bidirectional protection requires a symmetric device such as DMLF33AQ-7.
How does the PowerDI123 package improve thermal performance versus SMA or SOD-123?
The PowerDI123's exposed cathode tab provides direct thermal conduction from the silicon die to the PCB copper pad, achieving RθJS = 6 °C/W-more than 2× better than SMA (≈15 °C/W) and ~2× better than SOD-123FL (≈12 °C/W). This allows higher surge repetition rates and extended operation at +125 °C ambient without derating.
Is DFLT33AQ-7 compatible with lead-free reflow profiles?
Yes. DFLT33AQ-7 features matte tin–annealed copper terminals and is rated for lead-free reflow per IPC/JEDEC J-STD-020, with peak temperature tolerance up to 260 °C. Its moisture sensitivity level 1 eliminates pre-bake requirements, enabling direct placement into standard Pb-free reflow ovens.
DFLT33AQ-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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 4.22A
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT33AQ-7 FAQ
1.How can I place an order for DFLT33AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT33AQ-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 DFLT33AQ-7 reliable?
The price and inventory of DFLT33AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT33AQ-7 is usually 5 days.
3.What payment methods are accepted for DFLT33AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT33AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT33AQ-7?
DFLT33AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT33AQ-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 DFLT33AQ-7?
For technical support, including DFLT33AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT33AQ-7 requirements.
6.How does Aetrix verify that DFLT33AQ-7 is sourced from the original manufacturer or authorized distributors?
All DFLT33AQ-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 DFLT33AQ-7 meets industry standards.
7.What is the process for return or replacement of DFLT33AQ-7?
All DFLT33AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT33AQ-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 DFLT33AQ-7 part is unused and in its original packaging.
Return procedure for DFLT33AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT33AQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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