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Taiwan Semiconductor Corporation LL4448 L0G
- Part No.:
- LL4448 L0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
LL4448 L0G.pdf
- Description:
- DIODE GP 75V 150MA MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:19,820
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Product details
Overview
LL4448 L0G from Taiwan Semiconductor is a surface-mount silicon switching diode in MMELF package, rated for 150 mA forward current, 75 V repetitive peak reverse voltage, and 4 ns reverse recovery time - used in high-frequency switching paths of DC/DC converters and SMPS secondary-side snubbing.
For engineers reviewing the LL4448 L0G datasheet, LL4448 L0G pinout, LL4448 L0G application, or LL4448 L0G equivalent, key selection criteria include VF at 100 mA (≤1.0 V), trr (≤4 ns), TJ max (175°C), RoHS compliance, and MMELF mechanical compatibility with high-density PCB layouts.
Technical Context
This diode operates as a unidirectional, single-die, fast-recovery rectifier optimized for high-speed switching in low-voltage, moderate-current power conversion stages. Its 4 ns reverse recovery time and 1.0 V forward voltage at 100 mA enable efficient operation in flyback and buck converter freewheeling paths.
The MMELF package provides hermetically sealed glass construction with matte tin-plated leads, supporting J-STD-002 solderability and junction temperatures up to +175°C - critical for thermally constrained industrial and lighting applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Continuous) | 150 mA - supports sustained current in auxiliary bias rails and signal-level switching |
| VRRM | 75 V - suitable for 48 V system-derived DC/DC stages and adapter output rectification |
| trr | 4 ns - enables >1 MHz switching frequencies without excessive switching loss |
| VF @ 100 mA | ≤1.0 V - minimizes conduction loss in low-voltage, high-duty-cycle paths |
| TJ max | +175°C - allows operation in enclosed, high-ambient environments like LED drivers |
| CJ @ 0 V | ≤4 pF - reduces capacitive loading in high-speed gate-drive or timing circuits |
Pinout & Package
MMELF package: hermetically sealed glass body, Ø1.50±0.10 mm × 3.50±0.20 mm length, cathode indicated by band, matte tin-plated axial leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry under forward bias | Connected to lower-potential node (e.g., switch node in boost, ground in flyback freewheel) |
| Cathode | Current exit under forward bias; marked by band | Connected to higher-potential node (e.g., output rail, VCC bias winding) |
Key Features
| Feature | Design Value |
|---|---|
| Fast reverse recovery (trr ≤ 4 ns) | Enables clean turn-off in >1 MHz SMPS without tail current or ringing |
| Low forward voltage (VF ≤ 1.0 V @ 100 mA) | Reduces I²R loss in compact, thermally limited adapters and LED drivers |
| High surge capability (IFSM = 4 A @ 1 µs) | Withstands transient overloads during startup or fault conditions in DC/DC modules |
| Hermetic glass MMELF package | Ensures long-term reliability in humid or chemically aggressive industrial enclosures |
Applications
| SMPS Secondary Rectification | LED Driver Freewheel Path |
|---|---|
Use Scenario: Output rectification in isolated flyback converters delivering 5–24 V at ≤200 mA. IC Role / Device Role / Timing Role: Fast-switching unidirectional current path during transformer reset phase. Use Value: 4 ns trr prevents cross-conduction loss; 75 V VRRM covers reflected output transients. | Use Scenario: Freewheel diode across inductive LED driver chokes in constant-current buck topologies. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during MOSFET off-time. Use Value: 1.0 V VF at 100 mA limits heat rise in space-constrained lamp housings. |
| USB-C Adapter Snubber | Industrial Sensor Bias Supply |
Use Scenario: RCD snubber clamp diode on primary-side MOSFET in 20–65 W USB-C PD adapters. IC Role / Device Role / Timing Role: Rapidly clamps voltage spikes during MOSFET turn-off with minimal stored charge. Use Value: Low CJ (≤4 pF) avoids parasitic resonance; 175°C TJ max accommodates board-level hot spots. | Use Scenario: Reverse-polarity protection and supply rail decoupling in 4–20 mA loop-powered sensor nodes. IC Role / Device Role / Timing Role: Blocks backfeed from auxiliary rails while enabling low-leakage standby operation. Use Value: IR ≤5 µA @ 75 V ensures <1 µW leakage in battery-backed systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148WS-7-F | Same IF (150 mA), VRRM (100 V), but trr = 4 ns (identical); SOD-323 package (smaller footprint, lower thermal mass) | Suitable for ultra-compact layouts where MMELF height or lead pitch is prohibitive | Select when board area is constrained and thermal derating below 150 mA is acceptable |
| BAS16H,115 | Higher VRRM (85 V), same trr (4 ns), VF = 1.25 V @ 100 mA; SOT-23 package with three terminals (cathode/anode/NC) | Requires PCB redesign due to SOT-23 footprint and different lead spacing | Choose for higher reverse margin in 48 V bus monitoring, accepting higher VF penalty |
Compared with 1N4148WS-7-F and BAS16H,115, the LL4448 L0G offers identical speed and lower forward drop in a robust, hermetic MMELF package - ideal for industrial-grade reliability where thermal cycling and humidity resistance outweigh miniaturization needs.
Availability
LL4448 L0G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and on-board DC/DC converters requiring stable component supply and long-term manufacturability.
Supply support for LL4448 L0G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power devices and signal conditioning components.
The LL4148/LL4448/LL914B family was developed for cost-sensitive, high-volume switching applications demanding consistent trr, low VF, and hermetic reliability - particularly in consumer adapters, industrial power modules, and lighting ballasts.
FAQ
What is the maximum reverse voltage rating for LL4448 L0G?
The LL4448 L0G has a repetitive peak reverse voltage (VRRM) rating of 75 V. This value is confirmed in the Absolute Maximum Ratings table and applies under continuous operation at TA = 25°C. At elevated ambient temperatures, derating per the admissible power dissipation curve must be observed. The LL4448 L0G is not rated for 100 V operation - that specification applies only to the LL4148 variant per the same datasheet.
Is LL4448 L0G RoHS compliant and halogen-free?
Yes, the LL4448 L0G is RoHS compliant as explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet. While halogen-free status is not directly declared in the provided documentation, the matte tin-plated leads and glass package construction align with standard halogen-free manufacturing practices for this product family. Confirmation of halogen-free status should be verified via TSC's material declaration for order code LL4448 L0G.
What does the "L0G" suffix mean in LL4448 L0G?
The "L0G" suffix in LL4448 L0G indicates a tape-and-reel packaging variant with RoHS-compliant finish, identical in electrical and mechanical specifications to the "L0" version. Per the Ordering Information table, L0 and L0G denote physically identical parts - no parameter, reliability, or performance differences exist between them. The "G" denotes green (RoHS) compliance per Taiwan Semiconductor's internal coding convention.
Can LL4448 L0G replace LL4148 in existing designs?
LL4448 L0G can replace LL4148 only if the design operates within 75 V reverse voltage - the LL4148 has a higher VRRM (100 V). Both share identical MMELF package, 4 ns trr, and 150 mA IF, but the LL4448 L0G's lower VRRM makes it unsuitable for 100 V applications. Forward voltage differs slightly: LL4448 L0G is specified at ≤1.0 V @ 100 mA, while LL4148 is ≤1.0 V @ 50 mA. Verify stress margins before substitution.
What is the thermal resistance (RθJA) of LL4448 L0G?
The junction-to-ambient thermal resistance (RθJA) of LL4448 L0G is 300°C/W, as specified in the THERMAL PERFORMANCE section of the datasheet. This value assumes standard JEDEC test conditions (single device on 1-inch² FR-4 board with 2 oz copper). Actual board-level RθJA will vary based on pad size, copper area, and airflow. For reliable operation above 100 mA, thermal simulation or empirical measurement is recommended.
LL4448 L0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-213AC, MINI-MELF, SOD-80
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io):
- 150mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 75 V
- Capacitance @ Vr, F:
- 4pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
- Operating Temperature - Junction:
- -65°C ~ 175°C
LL4448 L0G FAQ
1.How can I place an order for LL4448 L0G through Aetrix?
Please submit a Request for Quotation (RFQ) for LL4448 L0G 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 LL4448 L0G reliable?
The price and inventory of LL4448 L0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LL4448 L0G is usually 5 days.
3.What payment methods are accepted for LL4448 L0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LL4448 L0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LL4448 L0G?
LL4448 L0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LL4448 L0G 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 LL4448 L0G?
For technical support, including LL4448 L0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LL4448 L0G requirements.
6.How does Aetrix verify that LL4448 L0G is sourced from the original manufacturer or authorized distributors?
All LL4448 L0G 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 LL4448 L0G meets industry standards.
7.What is the process for return or replacement of LL4448 L0G?
All LL4448 L0G units undergo pre-shipment inspection (PSI). If there is an issue with LL4448 L0G, 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 LL4448 L0G part is unused and in its original packaging.
Return procedure for LL4448 L0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LL4448 L0G Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
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MMSD4148T1G
onsemi
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MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
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