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Diodes Incorporated DFLT43A-7
- Part No.:
- DFLT43A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT43A-7.pdf
- Description:
- TVS DIODE 43VWM 69.4VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
DFLT43A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in PowerDI123 package, designed for primary overvoltage protection of DC power rails and signal lines. It features 43 V reverse standoff voltage, 69.4 V maximum clamping voltage at 3.24 A peak pulse current, and 225 W peak pulse power dissipation (10/1000 µs waveform), suitable for automotive body electronics and industrial control I/O protection.
For engineers reviewing the DFLT43A-7 datasheet, DFLT43A-7 pinout, DFLT43A-7 application, or DFLT43A-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under ISO 7637-2 pulse 1/2/5a, thermal resistance (RθJS = 6 °C/W), and AEC-Q101 qualification status for automotive deployment.
Technical Context
This TVS operates as a silicon avalanche diode with fast response (<1 ns) to transient overvoltages, triggering when reverse voltage exceeds 43 V (VRWM) and clamping to ≤69.4 V at 3.24 A (IPP). Its unidirectional configuration provides protection only against negative transients on anode-grounded circuits.
Thermal design relies on low junction-to-solder-point resistance (6 °C/W) and 1.0 W steady-state power dissipation on FR-4 with 1-inch² 2 oz copper pad. The device meets J-STD-020 moisture sensitivity level 1 and is halogen/antimony-free per Diodes' "Green" definition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 43 V - Maximum continuous DC operating voltage before clamping begins. |
| Breakdown Voltage (VBR) | 47.8–52.8 V @ 1.0 mA - Confirmed avalanche initiation range ensuring reliable turn-on margin. |
| Max Clamping Voltage (VC) | 69.4 V @ 3.24 A - Limits voltage seen by downstream circuitry during 10/1000 µs surge. |
| Peak Pulse Power (PPK) | 225 W (10/1000 µs) - Sustains standardized lightning/surge test waveforms without failure. |
| Junction-to-Solder Thermal Resistance | 6 °C/W - Enables efficient heat transfer to PCB copper, critical for repeated surge handling. |
| Operating Temperature Range | −65 °C to +150 °C - Supports under-hood automotive and industrial environments. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-cathode-band marking, 3-pin outline with cathode tab (pin 2) electrically connected to the cathode terminal and thermally coupled to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Transient current entry point | Connected to line being protected; carries full surge current into device. |
| Cathode (Pin 2 / Tab) | Clamped output & thermal path | Connected to ground/reference plane; serves as primary heat sink interface to PCB. |
| No connection (Pin 3) | Non-functional mechanical support | Internal die attach flag; electrically isolated and not bonded to die or leadframe. |
Key Features
| Feature | Design Value |
|---|---|
| 225 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-earth) surge immunity requirements. |
| Low RθJS = 6 °C/W | Enables >1000 surge events at rated IPP without thermal runaway when mounted per recommended pad layout. |
| Cathode-band polarity marking | Ensures correct orientation during automated placement and prevents reverse-bias misapplication in unidirectional circuits. |
| AEC-Q101 qualified variant available (DFLT43AQ) | Supports PPAP documentation and IATF 16949 manufacturing for automotive OEM Tier-1 supply chains. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontroller I/O pins from load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role: Primary clamping element placed between MCU pin and chassis ground. Use Value: Clamps to 69.4 V within nanoseconds, keeping MCU VDD-referenced inputs below absolute maximum rating (typically 70 V). |
Use Scenario: Safeguarding 24 V DC digital input channels against field-wiring induced surges in factory automation cabinets. IC Role / Device Role: Front-end transient absorber ahead of optocoupler or Schmitt-trigger input stage. Use Value: Limits voltage excursion to ≤69.4 V during 1 kV/500 A surge events, preventing latch-up or gate oxide damage in downstream logic. |
| Automotive Infotainment USB Port | Smart Meter RS-485 Interface |
Use Scenario: Suppressing ESD and coupled transients on USB VBUS line in vehicle head units exposed to hot-plug and cable discharge events. IC Role / Device Role: Unidirectional TVS placed between VBUS and ground, upstream of USB power switch. Use Value: Withstands ±30 kV contact ESD (IEC 61000-4-2) and clamps fast-rising 100 V transients to safe levels for USB power management ICs. |
Use Scenario: Protecting half-duplex RS-485 transceivers in utility smart meters subjected to lightning-induced surges on long outdoor data lines. IC Role / Device Role: Line-side TVS on A/B differential pair, referenced to local system ground. Use Value: Delivers 225 W surge handling at 43 V standoff, maintaining signal integrity while shunting >3 A transient current away from transceiver ESD structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A (Bourns) | Same 43 V VRWM, but 400 W PPK (10/1000 µs); SMA package (larger footprint, higher RθJA = 110 °C/W). | Higher surge rating suits infrequent high-energy events; less suitable for space-constrained automotive modules. | Select when board area allows SMA and surge energy exceeds 225 W; avoid if thermal budget is tight or AEC-Q101 compliance required. |
| DFLT43AQ (Diodes) | Identical electrical specs; AEC-Q101 qualified, PPAP-capable, manufactured in IATF 16949 facility. | Mandatory for automotive production programs requiring change control and automotive-grade traceability. | Choose DFLT43AQ for Tier-1 automotive designs; DFLT43A-7 remains valid for industrial or non-automotive applications where qualification is not required. |
Compared with SMAJ43A, DFLT43A-7 offers superior thermal performance (RθJS = 6 °C/W vs. ~35 °C/W typical for SMA) and smaller footprint, while DFLT43AQ adds automotive qualification without altering electrical behavior-making it the direct drop-in replacement for production-critical automotive use.
Availability
DFLT43A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and smart meter communication interfaces requiring stable component supply and consistent surge performance across production batches.
Supply support for DFLT43A-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 targets robust transient suppression in harsh environments, emphasizing low clamping voltage, high surge power density, and automotive-grade reliability-designed specifically for 12 V/24 V DC systems in transportation and industrial control.
FAQ
What is the polarity configuration of DFLT43A-7?
DFLT43A-7 is a unidirectional TVS diode with cathode-band marking indicating the cathode terminal. It conducts only during reverse-bias overvoltage events-i.e., when the anode is driven negative relative to cathode-and must be oriented with cathode tied to system ground or reference plane in standard protection configurations.
Does DFLT43A-7 meet AEC-Q101 requirements?
No-DFLT43A-7 is the commercial-grade version. The automotive-qualified variant is DFLT43AQ, which undergoes AEC-Q101 stress testing, is manufactured in IATF 16949-certified facilities, and supports PPAP documentation. DFLT43A-7 is intended for industrial and non-automotive applications.
What is the recommended PCB pad layout for thermal performance?
Diodes specifies a minimum 1-inch² (25.4 mm²) 2 oz copper pad connected to the cathode tab (Pin 2) for optimal thermal dissipation. The recommended pad dimensions are X = 1.05 mm, X1 = 2.40 mm, X2 = 4.10 mm, Y = Y1 = 1.50 mm, and G = 0.65 mm, per PowerDI123 outline drawing DS30581 page 5.
How does DFLT43A-7 perform under repeated surge stress?
With RθJS = 6 °C/W and 1.0 W steady-state dissipation limit, DFLT43A-7 can sustain ≥1000 cycles of 3.24 A, 10/1000 µs pulses at 25 °C ambient when mounted per recommended pad layout. Derating applies above 25 °C per Figure 1 in DS30581, with 50% power capability at 100 °C ambient.
DFLT43A-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 3.24A
- 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
DFLT43A-7 FAQ
1.How can I place an order for DFLT43A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT43A-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 DFLT43A-7 reliable?
The price and inventory of DFLT43A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT43A-7 is usually 5 days.
3.What payment methods are accepted for DFLT43A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT43A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT43A-7?
DFLT43A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT43A-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 DFLT43A-7?
For technical support, including DFLT43A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT43A-7 requirements.
6.How does Aetrix verify that DFLT43A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT43A-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 DFLT43A-7 meets industry standards.
7.What is the process for return or replacement of DFLT43A-7?
All DFLT43A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT43A-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 DFLT43A-7 part is unused and in its original packaging.
Return procedure for DFLT43A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT43A-7 Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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