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Diodes Incorporated DFLT17A-7
- Part No.:
- DFLT17A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT17A-7.pdf
- Description:
- TVS DIODE 17VWM 27.6VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:7,506
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Product details
Overview
DFLT17A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in PowerDI123 package, designed for overvoltage protection of DC power rails and signal lines. It features a 17V reverse standoff voltage (VRWM), 18.9–20.9V breakdown voltage (VBR), 27.6V clamping voltage (VC) at 8.15A peak pulse current, and 225W peak pulse power dissipation (10/1000µs waveform).
For engineers reviewing the DFLT17A-7 datasheet, DFLT17A-7 pinout, DFLT17A-7 application, or DFLT17A-7 equivalent, this device is selected for robust ESD and surge immunity in automotive body electronics, industrial I/O interfaces, and 12V/24V power supply rail protection where fast response (<1ns), low clamping ratio (VC/VRWM ≈ 1.62), and AEC-Q101-compliant variants are required.
Technical Context
This TVS operates as a clamping-type unidirectional protector with avalanche breakdown behavior. Its junction design delivers sub-nanosecond response to transients, and its low thermal resistance (RθJS = 6°C/W) enables effective heat transfer to the PCB cathode pad during repetitive surge events.
The device is rated for -65°C to +150°C operating temperature and exhibits ≤1.0µA reverse leakage at VRWM. Its 1.0W steady-state power dissipation (PD) and 125°C/W junction-to-ambient thermal resistance (RθJA) define its continuous power handling on standard FR-4 layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 17 V - Maximum continuous DC voltage before significant leakage; sets operating margin for 12V systems. |
| Breakdown Voltage (VBR) | 18.9–20.9 V @ 1.0 mA - Avalanche conduction onset range; ensures reliable triggering above normal rail variation. |
| Clamping Voltage (VC) | 27.6 V @ 8.15 A - Peak voltage seen by protected circuit during 10/1000µs surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPK) | 225 W (10/1000µs) - Surge energy absorption capability; supports IEC 61000-4-5 Level 3 (1kV/42Ω) compliance. |
| Thermal Resistance (RθJS) | 6 °C/W - Low junction-to-solder-point resistance enables efficient heat extraction via cathode tab to PCB copper. |
| Operating Temperature | -65°C to +150°C - Qualified for under-hood automotive and industrial environments without derating. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-cathode-band marking, molded green plastic (UL 94V-0), 0.01g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line; conducts during reverse-biased transient clamp. |
| Cathode | Ground/Reference side | Connected to system ground or low-impedance return; serves as primary thermal path to PCB. |
| Cathode Band | Polarity indicator | Visible marking on package top surface; identifies cathode terminal for correct PCB layout orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 225W peak pulse power | Enables protection against high-energy surges (e.g., ISO 7637-2 Pulse 1/2a/5a) without external heatsinking. |
| Low clamping ratio (VC/VRWM ≈ 1.62) | Minimizes overvoltage stress on 16V-rated components in 12V systems while maintaining noise margin. |
| Lead-free, halogen- and antimony-free | Meets RoHS 3 (2015/863/EU) and automotive "Green" standards; supports eco-compliant manufacturing. |
| PowerDI123 footprint | Compact 3.7mm × 1.78mm outline with exposed cathode pad; optimizes board space and thermal performance vs. SMA/SMB. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load dump and inductive switching spikes in door modules and lighting controllers. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground, with cathode tied to chassis ground plane. Use Value: Clamps transients to ≤27.6V within <1ns, preventing latch-up or damage to 3.3V/5V logic while surviving repeated 12V battery load dump events. | Use Scenario: Safeguarding 24V digital input channels against field-wiring induced surges and electrostatic discharge in factory automation cabinets. IC Role / Device Role: Primary surge clamp on input front-end, mounted directly at connector entry point with short trace to ground plane. Use Value: Absorbs 225W pulses without degradation, maintaining signal integrity for 24V optocoupler interface circuits across extended temperature ranges (-40°C to +85°C). |
| DC Power Supply Rail Protection | USB-C Port VBUS Line |
Use Scenario: Secondary overvoltage protection on 12V/24V DC-DC converter outputs feeding sensitive analog sensors or communication ICs. IC Role / Device Role: Back-to-back clamping configuration not used; single DFLT17A-7 placed anode-to-rail, cathode-to-ground to limit positive excursions. Use Value: Provides tighter clamping than Zener-based solutions (27.6V vs. typical 30V+), reducing risk of overvoltage-induced parametric drift in precision references. | Use Scenario: Supplemental surge suppression on USB-C VBUS line in portable docking stations subjected to hot-plug and cable-induced transients. IC Role / Device Role: Standby protector parallel to primary ESD array; activated only during high-energy (>100A) events beyond ESD diode rating. Use Value: Extends system-level surge immunity beyond IEC 61000-4-5 Level 2, enabling compliance with UL 62368-1 Annex G for accessory power delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Same VRWM (17V), higher VC (33.2V @ 6.0A), SMA package (larger footprint, higher RθJA = 150°C/W) | Lower surge current rating (6.0A vs. 8.15A); less suitable for high-repetition-rate industrial surges | Select when legacy SMA layout exists and thermal constraints allow higher clamping voltage. |
| DFLT17AQ-7 | AEC-Q101 qualified, identical electrical specs, same PowerDI123 package | Required for automotive production programs needing PPAP documentation and IATF 16949 traceability | Select for OEM automotive designs where change control, qualification evidence, and manufacturing auditability are mandatory. |
Compared with SMAJ17A, DFLT17A-7 delivers lower clamping voltage and superior thermal performance in a smaller footprint; versus DFLT17AQ-7, it lacks automotive qualification documentation but offers identical electrical behavior and cost advantage for non-automotive industrial use.
Availability
DFLT17A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and DC power rail safeguarding requiring stable component supply and consistent surge performance across production batches.
Supply support for DFLT17A-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' Power Discrete product line, engineered specifically for high-reliability transient suppression in automotive, industrial, and computing applications where compact size, low clamping, and AEC-Q101 compliance are critical.
FAQ
What is the maximum peak pulse current (Ipp) for DFLT17A-7, and under what test condition is it specified?
The DFLT17A-7 has a maximum peak pulse current (Ipp) of 8.15 A, measured under the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value corresponds to its 225 W peak pulse power rating and is validated at TA = +25°C with proper PCB thermal relief per JEDEC standards.
Does DFLT17A-7 meet automotive qualification requirements?
DFLT17A-7 itself is not AEC-Q101 qualified; however, the functionally identical DFLT17AQ-7 variant is fully qualified to AEC-Q101, manufactured in IATF 16949-certified facilities, and supports PPAP documentation. For automotive production, DFLT17AQ-7 must be specified instead.
How does the PowerDI123 package improve thermal performance compared to SMA packages?
The PowerDI123 package features an exposed cathode pad that provides direct thermal conduction to the PCB copper, achieving RθJS = 6°C/W-more than 2× better than SMA's typical RθJA of 150°C/W. This allows sustained surge handling without thermal runaway, especially in high-density layouts with limited airflow.
Can DFLT17A-7 be used in bidirectional configurations?
No-DFLT17A-7 is a unidirectional TVS diode, optimized for clamping positive transients on grounded systems. For bidirectional protection (e.g., AC lines or floating signals), a pair of DFLT17A-7 devices in series opposition or a dedicated bidirectional part like DFL055B-7 is required.
DFLT17A-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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 8.15A
- 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
DFLT17A-7 FAQ
1.How can I place an order for DFLT17A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT17A-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 DFLT17A-7 reliable?
The price and inventory of DFLT17A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT17A-7 is usually 5 days.
3.What payment methods are accepted for DFLT17A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT17A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT17A-7?
DFLT17A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT17A-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 DFLT17A-7?
For technical support, including DFLT17A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT17A-7 requirements.
6.How does Aetrix verify that DFLT17A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT17A-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 DFLT17A-7 meets industry standards.
7.What is the process for return or replacement of DFLT17A-7?
All DFLT17A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT17A-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 DFLT17A-7 part is unused and in its original packaging.
Return procedure for DFLT17A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT17A-7 Tags
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ESD9B5.0ST5G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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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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