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Diodes Incorporated DFLT18A-7
- Part No.:
- DFLT18A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT18A-7.pdf
- Description:
- TVS DIODE 18VWM 29.2VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:4,773
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Product details
Overview
DFLT18A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in PowerDI123 package, designed for primary overvoltage protection on DC power rails and signal lines. 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 dissipation (10/1000 µs waveform), deployed in automotive infotainment power inputs.
For engineers reviewing the DFLT18A-7 datasheet, DFLT18A-7 pinout, DFLT18A-7 application, or DFLT18A-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, IPP capability under ISO 7637-2 Pulse 1/2a/5a waveforms, thermal resistance (RθJS = 6 °C/W), and AEC-Q101 qualification status for automotive use.
Technical Context
This TVS operates as a clamping device: when reverse voltage exceeds 18 V (VRWM), it avalanches at minimum 20.0 V (VBR) with 1.0 mA test current, limiting transients to ≤29.2 V at 7.71 A. Its unidirectional configuration protects against negative-going surges only, requiring external polarity handling for bidirectional threats.
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 0.01 g PowerDI123 package supports automated SMT placement and meets J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 18 V - Maximum continuous DC operating voltage before leakage rises above 1.0 µA. |
| Breakdown Voltage (VBR) | 20.0–22.1 V @ 1.0 mA - Confirmed avalanche onset range ensuring predictable clamping initiation. |
| Max Clamping Voltage (VC) | 29.2 V @ 7.71 A - Peak voltage seen by protected circuit during 10/1000 µs surge, defining safe margin vs. downstream IC abs max rating. |
| Peak Pulse Power (PPK) | 225 W (10/1000 µs) - Sustained transient energy absorption capacity per single non-repetitive event. |
| Junction-to-Solder Thermal Resistance | 6 °C/W - Enables direct thermal path to PCB copper, critical for repeated surge duty cycles without thermal runaway. |
| Operating Temperature Range | −65 °C to +150 °C - Validated performance across automotive under-hood and cabin environments. |
Pinout & Package
Package: PowerDI123 - surface-mount, 3-pin (cathode-anode-cathode tab) molded plastic package with matte tin annealed copper leadframe, UL 94V-0 rated, 0.01 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band (Pin 1) | Surge Current Return Path | Connected to ground or low-impedance return; carries full transient current during clamping. |
| Anode (Pin 2) | Protected Line Input | Connected to line being protected (e.g., 12 V supply rail); reverse-biased during normal operation. |
| Cathode Tab (Exposed Pad) | Thermal & Electrical Ground | Integral solderable copper tab providing primary thermal conduction path and low-inductance ground connection. |
Key Features
| Feature | Design Value |
|---|---|
| 225 W Peak Pulse Power (10/1000 µs) | Supports robust protection against ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems without derating. |
| Low RθJS = 6 °C/W | Enables >1000 surge events at 1 Hz without exceeding 150 °C junction temperature on standard PCB layout. |
| Cathode-band polarity marking | Ensures correct orientation during automated placement and manual inspection, preventing reverse-bias failure in circuit. |
| AEC-Q101 qualified variant available (DFLT18AQ) | Validated for automotive-grade reliability including HTOL, TCT, and ESD testing per AEC-Q101 Rev G. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protects 12 V power input of BCM microcontroller from load dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed directly at connector entry point before bulk capacitance. Use Value: Limits voltage to 29.2 V during 7.71 A surge, maintaining <1.5 V margin below MCU's 30.7 V absolute maximum rating. |
Use Scenario: Shields 24 V digital input channel of PLC I/O module from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact input line, coordinated with series current-limiting resistor. Use Value: Absorbs 225 W transient energy without degradation, preserving input logic threshold integrity after repeated 1 kV/500 A surges. |
| USB-C Power Delivery Port | Telecom Remote Radio Unit (RRU) |
Use Scenario: Guards VBUS line in USB-C PD sink against hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Fast-response clamping device placed adjacent to USB-C receptacle, before PD controller. Use Value: Clamps sub-100 ns ESD events to <29.2 V within 1 ns response time, preventing latch-up in USB PD PHY. |
Use Scenario: Protects 48 V bias supply input of outdoor RRU power amplifier stage from lightning-induced surges. IC Role / Device Role / Timing Role: First-stage transient suppressor on DC feed line entering sealed RF enclosure. Use Value: Withstands 225 W pulses while maintaining <0.5 % leakage at 18 V, avoiding false shutdown in 24/7 base station operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A (onsemi) | Same 18 V VRWM, but 400 W PPK (10/1000 µs), SMA package, RθJA = 110 °C/W. | Higher power rating suits infrequent high-energy surges; larger SMA footprint limits board density. | Select when surge energy exceeds 225 W and thermal mass allows higher RθJA. |
| DFLT18AQ (Diodes) | Identical electrical specs, AEC-Q101 qualified, same PowerDI123 package, automotive PPAP support. | Required for production automotive programs needing change control, IATF 16949 traceability, and AEC validation. | Choose for Tier 1 automotive designs where qualification documentation and lot traceability are mandatory. |
Compared with SMAJ18A, DFLT18A-7 offers superior thermal performance (RθJS = 6 °C/W vs. ~100 °C/W) and smaller footprint, while DFLT18AQ adds automotive compliance without sacrificing electrical or thermal behavior-making it the drop-in upgrade path for production releases.
Availability
DFLT18A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power interface designs requiring stable component supply and consistent surge immunity performance.
Supply support for DFLT18A-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 targets high-reliability transient suppression in automotive and industrial power systems, emphasizing low clamping voltage, repeatable surge endurance, and thermally optimized packaging for harsh-environment deployment.
FAQ
What is the maximum clamping voltage of DFLT18A-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 29.2 V when subjected to a 7.71 A peak pulse current using the standard 10/1000 µs waveform. This value is measured under controlled lab conditions per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events.
Is DFLT18A-7 suitable for bidirectional transient protection?
No-DFLT18A-7 is a unidirectional TVS diode, configured to clamp only negative-going transients on the anode relative to cathode. For bidirectional protection, a dedicated bidirectional part (e.g., DFLU18A) or back-to-back unidirectional pair is required.
Does DFLT18A-7 meet automotive qualification requirements?
DFLT18A-7 itself is not AEC-Q101 qualified; however, the functionally identical DFLT18AQ variant is fully qualified to AEC-Q101 Rev G and manufactured in IATF 16949 certified facilities, with PPAP documentation available upon request.
How does the PowerDI123 package improve thermal performance over SMA?
The PowerDI123 exposes a large copper cathode tab that solder-reflows directly to PCB copper, achieving RθJS = 6 °C/W-over 15× better than SMA's typical RθJA. This enables sustained surge handling without thermal throttling and eliminates reliance on ambient convection cooling.
DFLT18A-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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT18A-7 FAQ
1.How can I place an order for DFLT18A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT18A-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 DFLT18A-7 reliable?
The price and inventory of DFLT18A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT18A-7 is usually 5 days.
3.What payment methods are accepted for DFLT18A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT18A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT18A-7?
DFLT18A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT18A-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 DFLT18A-7?
For technical support, including DFLT18A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT18A-7 requirements.
6.How does Aetrix verify that DFLT18A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT18A-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 DFLT18A-7 meets industry standards.
7.What is the process for return or replacement of DFLT18A-7?
All DFLT18A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT18A-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 DFLT18A-7 part is unused and in its original packaging.
Return procedure for DFLT18A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT18A-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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