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Diodes Incorporated DFLT20A-7
- Part No.:
- DFLT20A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT20A-7.pdf
- Description:
- TVS DIODE 20VWM 32.4VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
DFLT20A-7 from Diodes Incorporated is a unidirectional 20V standoff transient voltage suppressor (TVS) diode in PowerDI123 package, rated for 225W peak pulse power (10/1000µs), 32.4V clamping voltage at 6.94A peak pulse current, and 1.0W DC power dissipation - deployed for automotive and industrial DC power rail protection against ESD and lightning-induced surges.
For engineers reviewing the DFLT20A-7 datasheet, DFLT20A-7 pinout, DFLT20A-7 application, or DFLT20A-7 equivalent, key selection criteria include reverse standoff voltage (20V), clamping voltage (32.4V), peak pulse current (6.94A), thermal resistance (RθJA = 125°C/W), and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity, designed to shunt transient energy to ground when reverse voltage exceeds 20V standoff and reaches breakdown (22.2–24.5V @ 1mA). It uses silicon avalanche junction technology with low dynamic impedance to maintain tight clamping under fast-rising transients.
Its PowerDI123 package enables high thermal efficiency via direct cathode-tab soldering to PCB copper, achieving RθJS = 6°C/W to solder point and supporting 50A surge current (8.3ms half-sine) without failure - critical for 12V/24V automotive power networks and industrial PLC I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 20 V - Maximum continuous DC operating voltage before leakage rises above 1 µA; defines safe operating margin for 12V/24V systems. |
| Breakdown Voltage (VBR) | 22.2–24.5 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering within 10% tolerance of VRWM. |
| Clamping Voltage (VC) | 32.4 V @ 6.94 A - Measured peak voltage during 10/1000µs surge; limits downstream IC stress below 33V absolute maximum ratings. |
| Peak Pulse Power (PPK) | 225 W (10/1000µs) - Sustains standardized lightning surge energy without degradation; derates linearly above +25°C ambient. |
| Thermal Resistance (RθJA) | 125 °C/W - Measured on FR-4 with 1"² 2oz copper pad; determines max steady-state power (1.0W) before junction exceeds 150°C. |
| Capacitance (CT) | ~35 pF @ 0 V - Low parasitic capacitance preserves signal integrity in data-line protection applications like CAN FD or LIN bus interfaces. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-ended cathode-tab package with matte tin annealed terminals; UL 94V-0 molded green compound; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., battery feed); carries surge current into device during clamping. |
| Cathode (Tab) | Ground reference | Exposed metal tab serves as primary heat path and low-inductance return; must be soldered to ≥1"² 2oz copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| 225W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4kV) surge immunity testing on 12V/24V rails without derating. |
| AEC-Q101 qualified variant available | DFLT20AQ meets automotive stress test requirements including temperature cycling, HTRB, and ESD-HBM ±8kV. |
| Low clamping ratio (VC/VRWM = 1.62) | Minimizes overvoltage exposure to downstream components - critical for protecting 3.3V/5V logic powered from protected rails. |
| Green, halogen-free construction | Complies with RoHS 3 (2015/863/EU) and JEDEC J-STD-020 MSL Level 1; no special baking required before reflow. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12V supply input of BCM microcontroller and CAN transceivers from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and local LDO input, triggered within <1ns after voltage exceeds 20V. Use Value: Limits clamped voltage to 32.4V, ensuring downstream 36V-rated LDOs and 5V CAN PHYs remain within safe operating area during 100V/100ms load dump events. | Use Scenario: Shields 24V digital input circuitry from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated optocoupler input stage, absorbing 1kV/500A ring-wave transients per IEC 61000-4-5. Use Value: Withstands 6.94A peak pulse current while maintaining <33V clamping, preventing false triggering and latch-up in 24V logic interface ICs. |
| Telecom Power Supply OVP | Medical Equipment Battery Interface |
Use Scenario: Secondary overvoltage protection on 48V telecom rectifier output, supplementing primary crowbar circuitry. IC Role / Device Role / Timing Role: Fast-response shunt element that activates before upstream fuses blow, limiting voltage overshoot during AC line fault conditions. Use Value: 225W pulse rating enables handling of 10/1000µs transients up to 48V × 4.7A, reducing need for redundant protection stages. | Use Scenario: Safeguards lithium-ion battery management system (BMS) analog front-end from ESD events during hot-plug connection. IC Role / Device Role / Timing Role: ESD suppression diode on battery sense line, placed adjacent to connector with minimal trace length to reduce inductance. Use Value: 35pF capacitance avoids signal distortion on millivolt-level cell voltage measurements; 32.4V clamping protects 5V ADC inputs without adding series resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same 20V VRWM, but SMA package (RθJA = 150°C/W); lower 400W peak power (but only 400W @ 10/1000µs, not sustained). | Less effective thermal dissipation in high-ambient industrial enclosures; requires larger copper area for equivalent derating. | Select when cost-sensitive and board space allows larger footprint; avoid in sealed automotive modules above +85°C ambient. |
| 1.5SMC20A | Higher 1500W peak rating (8/20µs), but DO-214AB package; 35.5V clamping vs. 32.4V - 9% higher let-through voltage. | Superior for lightning surge (IEC 61000-4-5), but less precise clamping for sensitive 3.3V logic protection. | Prefer for mains-connected equipment; DFLT20A-7 better suited for low-voltage IC protection where clamping precision matters more than raw power. |
Compared with SMAJ20A and 1.5SMC20A, DFLT20A-7 delivers tighter clamping (32.4V), superior thermal performance (RθJS = 6°C/W), and smaller footprint - making it optimal for space-constrained, high-reliability automotive and industrial control applications where voltage margin and thermal stability are critical.
Availability
DFLT20A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical battery management systems requiring stable component supply across extended product lifecycles.
Supply support for DFLT20A-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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with design centers in Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.
The DFLT series targets high-reliability transient suppression in automotive and industrial environments, engineered specifically for AEC-Q101 compliance, low clamping ratios, and robust surge endurance in compact surface-mount packages.
FAQ
What is the maximum operating temperature for DFLT20A-7?
The DFLT20A-7 has an operating junction temperature range of –65°C to +150°C. Its thermal resistance (RθJA = 125°C/W) means at 1.0W DC dissipation and +25°C ambient, junction temperature reaches 150°C - the absolute maximum. Derating is required above +25°C ambient per Figure 1 in DS30581 Rev. 12-2.
Is DFLT20A-7 suitable for bidirectional transient protection?
No - DFLT20A-7 is a unidirectional TVS diode, intended only for DC circuits with defined polarity (e.g., 12V/24V supply lines). For AC or bidirectional signal lines (e.g., RS-485, USB), use the bidirectional DFL20A-7 variant, which features symmetrical clamping in both polarities.
Does DFLT20A-7 meet automotive qualification standards?
The base DFLT20A-7 is not AEC-Q101 qualified; however, the automotive-compliant variant DFLT20AQ is fully qualified per AEC-Q101, manufactured in IATF 16949 facilities, and supports PPAP documentation. DFLT20AQ shares identical electrical specs but adds stress-test validation for automotive environments.
How does the PowerDI123 package improve thermal performance over SMA?
The PowerDI123's exposed cathode tab provides a direct thermal path to the PCB, achieving RθJS = 6°C/W - nearly 3× better than SMA's typical RθJS (~17°C/W). This allows higher sustained power handling and improved reliability in thermally constrained layouts, especially when mounted on ≥1"² 2oz copper.
DFLT20A-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 6.94A
- 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
DFLT20A-7 FAQ
1.How can I place an order for DFLT20A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT20A-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 DFLT20A-7 reliable?
The price and inventory of DFLT20A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT20A-7 is usually 5 days.
3.What payment methods are accepted for DFLT20A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT20A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT20A-7?
DFLT20A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT20A-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 DFLT20A-7?
For technical support, including DFLT20A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT20A-7 requirements.
6.How does Aetrix verify that DFLT20A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT20A-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 DFLT20A-7 meets industry standards.
7.What is the process for return or replacement of DFLT20A-7?
All DFLT20A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT20A-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 DFLT20A-7 part is unused and in its original packaging.
Return procedure for DFLT20A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT20A-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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