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Diodes Incorporated DFLT45A-7
- Part No.:
- DFLT45A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT45A-7.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
DFLT45A-7 from Diodes Incorporated is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in PowerDI123 package, designed for primary overvoltage protection of DC power rails and signal lines. It features 45V reverse standoff voltage (VRWM), 50.0–55.3V breakdown voltage (VBR), 72.7V clamping voltage at 3.10A peak pulse current, and 225W peak pulse power dissipation (10/1000µs waveform).
For engineers reviewing the DFLT45A-7 datasheet, DFLT45A-7 pinout, DFLT45A-7 application, or DFLT45A-7 equivalent, this device is selected for robust ESD and surge immunity in automotive infotainment power supplies, industrial I/O interfaces, and USB-C port protection where low clamping ratio and fast response (<1 ns) are critical.
Technical Context
This TVS operates as a clamping-type unidirectional protector with avalanche breakdown behavior, triggered when reverse voltage exceeds VRWM = 45V. Its junction structure delivers sub-nanosecond response time and maintains stable clamping performance across -65°C to +150°C operating range.
Thermal design is enabled by low RθJS = 6°C/W (junction-to-soldering point) and 1.0W DC power dissipation on FR-4 PCB with 1-inch² 2oz copper pad. The cathode-band-marked PowerDI123 package supports automated placement and reflow compatibility per J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 45 V - Maximum continuous DC voltage the device blocks without clamping; sets minimum system operating margin before protection activates. |
| Breakdown Voltage (VBR) | 50.0–55.3 V @ 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above nominal rail while avoiding false trips. |
| Clamping Voltage (VC) | 72.7 V @ 3.10 A - Peak voltage seen by protected circuit during 10/1000µs surge; determines downstream component stress level. |
| Peak Pulse Power (PPK) | 225 W (10/1000µs) - Sustains defined transient energy without failure; validated per REA waveform standards. |
| Junction-to-Solder Point Thermal Resistance | 6 °C/W - Enables effective heat transfer to PCB copper; supports sustained operation under repeated surges with minimal thermal derating. |
| Operating Temperature Range | -65°C to +150°C - Qualified for under-hood automotive and industrial environments without performance degradation. |
Pinout & Package
Package: PowerDI123 - Surface-mount, single-diode configuration with cathode band marking; molded green plastic housing (UL 94V-0), 0.01g mass, 125°C/W junction-to-ambient thermal resistance on standard FR-4 layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line-side connection | Connected to protected line (e.g., 12V rail); carries surge current into device during clamping event. |
| Cathode | Output/Ground reference | Connected to system ground or low-impedance return path; forms clamping loop with anode to limit voltage excursion. |
| Cathode Band | Orientation marker | Visible marking on package top surface indicating cathode terminal; essential for correct PCB footprint alignment and assembly verification. |
Key Features
| Feature | Design Value |
|---|---|
| 225W peak pulse power rating | Supports IEC 61000-4-5 Level 4 (4kV/2Ω) surge testing on 12V/24V systems without degradation. |
| Low clamping ratio (VC/VRWM = 1.62) | Minimizes overvoltage stress on downstream regulators and microcontrollers during transients. |
| Lead-free, halogen- and antimony-free "Green" construction | Complies with RoHS 3 (2015/863/EU) and automotive change control requirements for PPAP-capable supply chains. |
| PowerDI123 package with 6°C/W RθJS | Enables high-density PCB layouts while maintaining thermal reliability in confined enclosures. |
Applications
| Automotive Infotainment Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: 12V supply line feeding head unit MCU and display driver ICs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary clamping TVS placed upstream of LDO and buck converter inputs. Use Value: Limits transient voltage to ≤72.7V, preventing latch-up or gate oxide damage in 3.3V/5V logic devices. |
Use Scenario: 24V digital input channel receiving signals from field sensors subject to inductive switching spikes. IC Role / Device Role: Front-end surge suppressor on optocoupler input side before signal conditioning. Use Value: Absorbs >200W surges without failure, preserving input integrity and reducing false trigger rates. |
| USB-C Port VBUS Line Protection | Smart Meter Communication Interface |
Use Scenario: VBUS line (5–20V) in USB-C receptacle subjected to ESD events and hot-plug overshoot. IC Role / Device Role: Unidirectional TVS between connector and USB PD controller's VBUS monitor pin. Use Value: Clamps 8kV contact ESD (IEC 61000-4-2) within 1ns, maintaining ±5% VBUS regulation accuracy. |
Use Scenario: RS-485 transceiver power rail in utility meter exposed to lightning-induced surges on long outdoor wiring. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy. Use Value: Provides precise 72.7V clamping to protect transceiver's 3.3V internal logic from secondary surge coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A | Same VRWM (45V) and VC (72.7V), but SMA package (RθJA = 140°C/W vs. 125°C/W); 400W PPK rating. | Higher peak power but larger footprint and inferior thermal coupling; less suitable for high-density automotive PCBs. | Select when higher single-pulse energy handling is required and board space permits SMA footprint. |
| DFLT45AQ-7 | AEC-Q101 qualified variant with identical electrical specs; manufactured in IATF 16949 facility; PPAP documentation available. | Required for production automotive ECUs; not needed for industrial prototypes or non-safety-critical designs. | Choose for Tier-1 automotive programs requiring full change control and qualification traceability. |
Compared with SMAJ45A, DFLT45A-7 offers superior thermal performance in compact layout and lower profile; versus DFLT45AQ-7, it provides identical protection performance at lower cost and lead time for non-automotive applications.
Availability
DFLT45A-7 is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC digital inputs, and USB-C VBUS line protection requiring stable component supply and consistent surge performance across production batches.
Supply support for DFLT45A-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
This device belongs to the DFLT series of surface-mount TVS diodes engineered for high-reliability transient suppression in automotive, industrial, and consumer power systems where compact size and repeatable clamping are mandatory.
FAQ
What is the maximum peak pulse current (Ipp) for DFLT45A-7 under 10/1000µs waveform?
The DFLT45A-7 sustains 3.10A peak pulse current at its specified clamping voltage of 72.7V under the 10/1000µs waveform per IEC 61000-4-5. This value is confirmed in the Electrical Characteristics table (page 2 of DS30581 Rev. 12-2) and reflects worst-case surge energy absorption capability at TA = +25°C.
Does DFLT45A-7 meet AEC-Q101 qualification requirements?
No - DFLT45A-7 is not AEC-Q101 qualified. Diodes offers the automotive-grade variant DFLT45AQ-7, which undergoes additional stress testing, PPAP documentation, and is produced in IATF 16949-certified facilities. DFLT45A-7 is intended for industrial and commercial applications where full automotive qualification is not mandated.
Can DFLT45A-7 be used in bidirectional protection configurations?
No - DFLT45A-7 is a unidirectional TVS diode, optimized for DC rail protection with polarity-sensitive cathode connection. For bidirectional AC or data-line protection, Diodes recommends the DFLU series or SMAJxxCA family, which feature symmetrical breakdown characteristics and dual-anode/cathode architecture.
What is the recommended PCB pad layout for PowerDI123 package of DFLT45A-7?
Diodes specifies a suggested pad layout with dimensions G = 0.65mm, X = 1.05mm, X1 = 2.40mm, X2 = 4.10mm, Y = 1.50mm, and Y1 = 1.50mm (all in mm), published in the package outline document linked from diodes.com/package-outlines.html. Use this layout to ensure solder joint reliability and thermal conduction to the copper pour.
DFLT45A-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT45A-7 FAQ
1.How can I place an order for DFLT45A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT45A-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 DFLT45A-7 reliable?
The price and inventory of DFLT45A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT45A-7 is usually 5 days.
3.What payment methods are accepted for DFLT45A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT45A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT45A-7?
DFLT45A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT45A-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 DFLT45A-7?
For technical support, including DFLT45A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT45A-7 requirements.
6.How does Aetrix verify that DFLT45A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT45A-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 DFLT45A-7 meets industry standards.
7.What is the process for return or replacement of DFLT45A-7?
All DFLT45A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT45A-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 DFLT45A-7 part is unused and in its original packaging.
Return procedure for DFLT45A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT45A-7 Tags
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