Diodes Incorporated \u7684 DFLT30A-7 \u662f\u4e00\u6b3e 225 W \u5355\u5411 TVS \u4e8c\u6781\u7ba1\uff0c\u91c7\u7528 PowerDI 123 \u5c01\u88c5\u3002\u5b83\u5177\u6709 30 V \u53cd\u5411\u963b\u6297\u7535\u538b (VRWM)\u300133.3-36.8 V \u51fb\u7a7f\u7535\u538b\u30014.65 A \u5cf0\u503c\u8109\u51b2\u7535\u6d41\u4e0b 48.4 V \u6700\u5927\u7b9d\u4f4d\u7535\u538b\u30011 uA \u6700\u5927\u53cd\u5411\u6f0f\u7535\u6d41\u548c 1 W \u7a33\u6001\u529f\u7387\u8017\u6563\u3002\u901a\u8fc7 AEC-Q101 \u8ba4\u8bc1\u3002\u5de5\u4f5c\u6e29\u5ea6\u8303\u56f4\u4e3a -65C \u81f3 +150C\u3002\u540e\u7f00 -7 \u8868\u793a 3000 \u4ef6\u5e26\u5377\u5305\u88c5\u3002.<\/p>","protected":false},"excerpt":{"rendered":"
The DFLT30A-7 from Diodes Incorporated is a 225 W unidirectional TVS diode in a PowerDI 123 package. It features 30 V reverse standoff voltage (VRWM), 33.3-36.8 V breakdown voltage, 48.4 V maximum clamping voltage at 4.65 A peak pulse current, 1 uA maximum reverse leakage, and 1 W steady-state power dissipation. AEC-Q101 qualified. Operating temperature […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[54,13],"tags":[],"chip_brand":[163],"class_list":["post-2068","post","type-post","status-publish","format-standard","hentry","category-diodes","category-integrated-circuits-ics","chip_brand-diodes-incorporated"],"acf":{"brief_explanation":"30V uni-directional TVS, 225W Ppp, 48.4V clamp@4.65A, 33.3-36.8V VBR, PowerDI 123, AEC-Q101","date_code":"","package_case":"PowerDI 123 (3.7 x 2.8 x 1.78 mm, 2-pin, SMD)","in_stock":4734,"datasheet":"https:\/\/www.diodes.com\/assets\/Datasheets\/DFLT5V0A-DFLT51A.pdf","price":"$0.11 (5K+ pcs)","product_introduction":"The DFLT30A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in the compact PowerDI 123 surface-mount package. It is part of the DFLT series covering standoff voltages from 5.0 V to 51 V, providing scalable protection across common system voltages.\n\nThe DFLT30A provides 30 V reverse standoff voltage (VRWM), making it suitable for protecting 24 V nominal rails (24 V + 25% tolerance = 30 V maximum). The 33.3 V minimum breakdown voltage ensures the TVS does not conduct during normal operation, while the 36.8 V maximum breakdown guarantees it starts clamping before the protected circuitry is damaged.\n\nUnder a transient event (IEC 61000-4-5 8\/20 us or 10\/1000 us waveform), the device clamps at a maximum of 48.4 V at 4.65 A peak pulse current. This clamping voltage provides the protection margin that determines whether the downstream IC survives the transient.\n\nThe PowerDI 123 package achieves a very low 6C\/W junction-to-soldering-point thermal resistance, enabling efficient heat transfer during surge events. The package is rated for 225 W peak pulse power on a 10\/1000 us waveform and 1125 W on an 8\/20 us waveform. The 1 W steady-state DC power dissipation allows the device to handle continuous reverse power without thermal runaway.\n\nThe DFLT30A-7 is AEC-Q101 qualified for automotive applications and uses green molding compound (no bromine, no antimony). The -7 suffix indicates tape-and-reel packaging with 3000 units per reel. The marking code for DFLT30A is not specified in the available data sheet excerpt.","working_principle":"**Avalanche TVS Operation:** The DFLT30A uses an avalanche (Zener) junction designed to handle high transient power. In normal operation (voltage below VRWM = 30 V), the TVS draws only leakage current (1 uA max). When a transient exceeds the breakdown voltage (VBR = 33.3-36.8 V), the junction avalanches and clamps the voltage.\n\n**Clamping Mechanism:** During an avalanche event, the TVS presents a low dynamic impedance, holding the voltage close to VBR for moderate currents. At the rated peak pulse current (IPP = 4.65 A), the clamping voltage rises to VC = 48.4 V maximum due to the device's dynamic resistance. Lower surge currents result in lower clamping voltages.\n\n**Unidirectional Configuration:** The DFLT30A is unidirectional, meaning it clamps only positive transients (with respect to the cathode). For negative transients, the internal diode forward-biases and clamps at approximately 3.5 V at 12 A. Bidirectional protection requires two devices in back-to-back configuration or a bidirectional TVS.\n\n**PowerDI 123 Thermal Advantage:** The PowerDI 123 package features a large cathode tab that solders directly to the PCB copper pour. With RthJS of only 6C\/W, heat from the avalanche event transfers quickly to the PCB, reducing peak junction temperature and improving surge survival. This thermal advantage enables the 225 W peak pulse power rating in a package smaller than SMA\/SMB.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | Anode<\/td> | I<\/td> | Anode; connect to protected line or ground depending on configuration; cathode band on package indicates cathode end; current flows from anode to cathode in forward direction<\/td><\/tr> | ||||||||||||||||||||||
| 2<\/td> | Cathode<\/td> | O<\/td> | Cathode; large tab for thermal dissipation; connect to protected line (cathode toward positive rail) or to VCC rail; solder tab to copper pour with thermal vias for optimal surge performance<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|