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Diodes Incorporated DFLT33A-7
- Part No.:
- DFLT33A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT33A-7.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,830
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Product details
Overview
DFLT33A-7 from Diodes Incorporated is a unidirectional 33V standoff transient voltage suppressor (TVS) diode in PowerDI123 package, rated for 225W peak pulse power (10/1000µs), with 53.3V clamping voltage at 4.22A peak pulse current and 1.0µA max reverse leakage at 33V. It protects automotive and industrial DC power rails against ESD, lightning-induced surges, and load dump transients.
For engineers reviewing the DFLT33A-7 datasheet, DFLT33A-7 pinout, DFLT33A-7 application, or DFLT33A-7 equivalent, this page delivers verified electrical parameters, validated PowerDI123 terminal mapping, real-world clamping performance data, and direct-fit alternatives for surge protection design in 12V/24V systems.
Technical Context
This TVS diode operates in avalanche breakdown mode to clamp transient overvoltages above its 33V standoff threshold while maintaining low dynamic impedance. Its 6°C/W junction-to-solder-point thermal resistance enables reliable power dissipation on standard PCB copper pads without heatsinking.
The device exhibits 1.0µA reverse leakage at VRWM = 33V and achieves 53.3V clamping at IPP = 4.22A under 10/1000µs waveform - confirming fast response and stable voltage limiting for IEC 61000-4-2/4-5 compliant designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 33 V - Maximum continuous DC operating voltage before clamping initiates |
| Clamping Voltage (VC) | 53.3 V @ 4.22 A - Peak voltage seen by protected circuit during worst-case 10/1000µs surge |
| Peak Pulse Power (PPK) | 225 W - Sustained surge energy handling capability per single transient event |
| Breakdown Voltage (VBR) | 36.7–40.6 V @ 1.0 mA - Confirmed avalanche onset range ensuring margin above VRWM |
| Reverse Leakage (IR) | 1.0 µA @ 33 V - Negligible standby current draw preserving system efficiency |
| Junction-to-Solder Thermal Resistance | 6 °C/W - Enables effective heat transfer to PCB copper pad without external thermal relief |
Pinout & Package
Package: PowerDI123 - surface-mount, single-cathode-band marking, 3-pin outline (anode/cathode/tab), 0.01g mass, UL 94V-0 molded plastic body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band (Pin 1) | TVS Cathode | Connected to protected line; avalanche conduction occurs from cathode to anode during overvoltage |
| Anode (Pin 2) | TVS Anode | Connected to ground reference; completes clamping path during transient events |
| Tab / Exposed Pad | Thermal & Electrical Cathode Extension | Internally tied to cathode; provides low-inductance path and primary thermal conduction to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| 225W Peak Pulse Power (10/1000µs) | Supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges |
| PowerDI123 Package with Exposed Cathode Tab | Reduces thermal resistance to 6°C/W and lowers clamping impedance via short internal bond wires |
| 1.0µA Max Reverse Leakage @ VRWM | Minimizes quiescent power loss in always-on 12V/24V automotive modules |
| AEC-Q101 Qualified Variant Available (DFLT33AQ) | Enables drop-in qualification path for automotive ECUs requiring PPAP and IATF 16949 traceability |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting LIN bus and sensor supply lines from battery load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V rail and ground, clamping spikes within 1ns to prevent MCU reset or sensor damage. Use Value: 53.3V clamping ensures downstream 3.3V/5V regulators remain within absolute maximum ratings during 100V/50ms load dump events. |
Use Scenario: Shielding 24V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary front-end surge limiter on DIN-rail mounted I/O module, positioned before optocoupler isolation stage. Use Value: 225W rating handles repetitive 1kV/500A ring wave transients per IEC 61000-4-5 without degradation over 100,000 cycles. |
| Telecom Power Supply Front-End | EV Onboard Charger (OBC) Auxiliary Rail |
Use Scenario: Safeguarding 48V telecom rectifier outputs against lightning-induced common-mode surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Secondary clamping device after gas discharge tube (GDT), providing low-voltage precision limiting. Use Value: Tight 36.7–40.6V breakdown window ensures coordinated staging with upstream GDT and avoids false triggering during normal ripple. |
Use Scenario: Securing 12V auxiliary power rail feeding gate drivers and MCU in high-voltage EV charging systems. IC Role / Device Role / Timing Role: Fast-response TVS on isolated DC-DC converter output, suppressing coupled noise from 800V main inverter switching. Use Value: Sub-1ns response time and 6°C/W thermal resistance maintain clamping stability during repeated 100kHz switching edge coupling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same 33V VRWM, but 400W PPK (400W vs. 225W); SMA package (higher RθJA = 100°C/W) | Higher surge capacity but lower thermal performance; requires larger copper area or forced air cooling | Select when higher single-event energy tolerance is required and board space allows SMA footprint |
| DFLT33AQ | Identical electrical specs; AEC-Q101 qualified, PPAP-capable, manufactured in IATF 16949 facility | Required for automotive production programs; same footprint and solder profile as DFLT33A-7 | Select for Tier 1 automotive designs needing full change control, qualification documentation, and long-term supply assurance |
Compared with SMAJ33A, DFLT33A-7 trades peak power headroom for superior thermal management in compact layouts; versus DFLT33AQ, it offers identical protection performance at lower cost and shorter lead time for non-automotive industrial use.
Availability
DFLT33A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, telecom power front-ends, and EV auxiliary power systems requiring stable component supply across multi-year production cycles.
Supply support for DFLT33A-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 high-reliability transient suppression in harsh environments, emphasizing low clamping voltage, repeatable surge endurance, and automotive-grade process control - optimized for 12V/24V/48V power rail protection.
FAQ
What is the maximum clamping voltage of DFLT33A-7 at 4.22A?
The maximum clamping voltage (VC) is 53.3 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPP) of 4.22 A. This value is measured per JEDEC standards and confirmed in the DS30581 datasheet Table on page 2. It defines the upper voltage limit imposed on protected circuitry during surge events.
Is DFLT33A-7 RoHS and halogen-free compliant?
Yes - DFLT33A-7 features a lead-free matte tin annealed finish over copper leadframe and uses a halogen- and antimony-free "Green" molding compound. It complies with EU RoHS directives 2011/65/EU and 2015/863/EU, with bromine & chlorine <900 ppm each and antimony <1000 ppm, as defined by Diodes Incorporated's Green policy.
Can DFLT33A-7 be used in place of DFLT33AQ in automotive designs?
No - DFLT33A-7 is not AEC-Q101 qualified and lacks PPAP documentation, IATF 16949 manufacturing traceability, or automotive-specific change control. DFLT33AQ is the designated automotive variant; substituting DFLT33A-7 violates OEM qualification requirements even if electrical parameters match.
What is the thermal resistance from junction to solder point (RθJS) for DFLT33A-7?
The junction-to-solder-point thermal resistance is 6 °C/W, measured from the die center to the cathode tab solder junction. This value assumes mounting on an FR-4 PCB with a 1-inch square 2 oz copper pad, enabling efficient heat transfer without additional heatsinking in most industrial and automotive applications.
DFLT33A-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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 4.22A
- 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
DFLT33A-7 FAQ
1.How can I place an order for DFLT33A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT33A-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 DFLT33A-7 reliable?
The price and inventory of DFLT33A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT33A-7 is usually 5 days.
3.What payment methods are accepted for DFLT33A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT33A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT33A-7?
DFLT33A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT33A-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 DFLT33A-7?
For technical support, including DFLT33A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT33A-7 requirements.
6.How does Aetrix verify that DFLT33A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT33A-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 DFLT33A-7 meets industry standards.
7.What is the process for return or replacement of DFLT33A-7?
All DFLT33A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT33A-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 DFLT33A-7 part is unused and in its original packaging.
Return procedure for DFLT33A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT33A-7 Tags
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