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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated LL4448-7

Name: LL4448-7
Brand: Diodes Incorporated
SKU: LL4448-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LL4448-7

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: LL4448-7.pdf

Description:: DIODE GP 75V 150MA MINI MELF

Quantity:: RFQ Add To RFQ list

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Inventory:4,500

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Product details

Overview

LL4448-7 from Diodes Incorporated is a fast-switching silicon epitaxial planar surface-mount diode in MiniMELF glass package, rated for 75 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time, used for general-purpose rectification and signal clamping in compact power supplies and logic interface circuits.

For engineers reviewing the LL4448-7 datasheet, LL4448-7 pinout, LL4448-7 application, or LL4448-7 equivalent, key selection criteria include its 0.62–0.72 V forward voltage at 5 mA, 5.0 µA max reverse leakage at 75 V/25°C, 4.0 pF junction capacitance, thermal resistance of 300 K/W, and MiniMELF mechanical compatibility with automated placement systems.

Technical Context

This diode employs silicon epitaxial planar construction to achieve fast switching performance with low forward voltage and controlled reverse recovery behavior. Its MiniMELF glass package provides hermetic sealing, UL 94V-0 flammability rating, and polarity identification via cathode band marking.

Designed for surface-mount assembly, it supports automatic insertion and operates across –65°C to +175°C junction temperature range. The device exhibits 25 nA reverse leakage at 75 V and 25°C, and 30 µA at 150°C - critical for high-temperature signal integrity in industrial control interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
VR_RMS	53 V - defines maximum continuous AC reverse voltage before breakdown in bridge or clamper topologies
I_F (max)	500 mA - supports higher pulsed current handling than LL4148 (300 mA), enabling use in higher-duty-cycle clamp circuits
t_rr	4.0 ns - enables reliable operation up to ~100 MHz switching frequencies in sample-and-hold or pulse shaping
V_F @ 5 mA	0.62–0.72 V - lower conduction loss than standard 1N4148 variants, reducing power dissipation in low-current bias networks
C_J	4.0 pF @ 0 V - limits capacitive loading on high-speed digital lines, preserving edge integrity in TTL/CMOS interface protection
R_θJA	300 K/W - requires minimal PCB copper area for thermal management in space-constrained MiniMELF layouts

Pinout & Package

MiniMELF glass cylindrical package with axial cathode band marking; no discrete pins - terminals are metallized end caps. Cathode identified by single black band; anode is unmarked end.

Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to positive-side signal or supply rail in clamp, protection, or rectifier configurations
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to reference node (e.g., ground or logic low) to enable clamping or reverse isolation

Key Features

Feature	Design Value
Fast switching speed	4.0 ns t_rr enables clean signal transitions in >50 MHz clock line protection and RF detector circuits
Silicon epitaxial planar construction	Ensures consistent junction characteristics and tight parameter distribution across production lots
RoHS-compliant Sn97.5Ag2.5 terminations	Supports lead-free reflow profiles without solder joint reliability degradation
UL 94V-0 glass case	Provides flame-retardant housing essential for compliance in industrial power adapter and lighting modules

Applications

Switch-Mode Power Supply Clamp

Digital Logic Interface Protection

Use Scenario: Suppresses voltage spikes across flyback transformer primary windings during MOSFET turn-off.

IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing inductive kickback energy within nanosecond-scale dead time.

Use Value: Prevents MOSFET overvoltage failure using 4.0 ns t_rr and 75 V V_RRM, minimizing snubber losses versus slower alternatives.

Use Scenario: Protects CMOS input pins from ESD transients and bus overvoltage in UART/I²C level-shifting circuits.

IC Role / Device Role / Timing Role: Low-capacitance (4.0 pF) clamping diode shunting excess voltage to rail while preserving signal edge rate.

Use Value: Maintains <1 ns signal distortion due to low C_J, unlike higher-capacitance TVS diodes unsuitable for 10+ Mbps data lines.

High-Frequency Signal Demodulation

Low-Power Sensor Bias Network

Use Scenario: Rectifies RF carrier signals in AM receiver front-ends and RFID tag detectors.

IC Role / Device Role / Timing Role: Small-signal detector diode leveraging low V_F (0.62 V) and fast t_rr to recover envelope with minimal distortion.

Use Value: Enables detection down to 100 kHz with <0.1 dB insertion loss, outperforming Schottky diodes with higher leakage at elevated temperatures.

Use Scenario: Provides precision bias current to photodiode or thermistor measurement circuits in portable instrumentation.

IC Role / Device Role / Timing Role: Low-leakage (25 nA @ 75 V) series diode establishing stable reference current path.

Use Value: Limits bias error to <0.5% over –40°C to +85°C ambient, critical for sub-1% accuracy analog sensor front-ends.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast-switching diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4448W	Identical electrical specs; same MiniMELF package but marked per JEDEC standard (no "LL" prefix)	No functional difference; identical use in clamping, rectification, and protection	Select when standard JEDEC part numbering is required for BOM alignment or legacy design continuity
BAS16W	Higher V_RRM (100 V), faster t_rr (3.0 ns), but higher V_F (0.85 V @ 50 mA); SOD-323 package	Preferred in 100 V-rated SMPS snubbers; not drop-in due to different footprint and thermal profile	Choose for higher-voltage or ultra-fast recovery needs where PCB layout allows SMD package change

Compared with LL4448-7, 1N4448W offers identical performance in the same package for seamless substitution, while BAS16W trades higher voltage rating and faster recovery for increased forward loss and incompatible MiniMELF-to-SOD-323 footprint transition.

Availability

LL4448-7 is available at Aetrix Electronics and suitable for switch-mode power supply clamp circuits, digital logic interface protection, high-frequency signal demodulation, and low-power sensor bias networks requiring stable component supply and long-term obsolescence mitigation.

Supply support for LL4448-7 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 and manufacturing operations across Asia and the Americas.

The LL-series fast-switching diodes target cost-sensitive, high-volume applications demanding reliability in MiniMELF form factor - especially consumer power adapters, industrial controls, and automotive body electronics where automated assembly and thermal robustness are essential.

FAQ

Is LL4448-7 RoHS compliant?

Yes. LL4448-7 features Sn97.5Ag2.5 lead-free terminations and meets EU Directive 2011/65/EU (RoHS 2) with all applicable exemptions applied. The glass MiniMELF case is UL 94V-0 rated and contains no restricted substances above threshold limits.

What is the maximum operating temperature for LL4448-7?

The junction and storage temperature range is –65°C to +175°C. At +175°C, reverse leakage rises to 30 µA at 75 V, and derating begins at 25°C ambient - power dissipation must be reduced by 1.68 mW per °C above that point to maintain reliability.

How does LL4448-7 differ from LL4148-13?

LL4448-7 has higher forward current rating (500 mA vs. 300 mA), lower forward voltage at 5 mA (0.62–0.72 V vs. unspecified for LL4148), and identical 4.0 ns t_rr. Both share MiniMELF packaging, but LL4448-7 is optimized for higher-current clamp and rectifier roles in compact designs.

Can LL4448-7 replace 1N4148 in existing designs?

Yes, with qualification. LL4448-7 matches or exceeds 1N4148's key parameters (V_RRM, t_rr, I_F) and shares the MiniMELF footprint. However, its lower V_F at low current may alter bias point behavior in precision analog circuits - verify operating point stability under actual load conditions.

LL4448-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-213AC, MINI-MELF, SOD-80

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: Mini MELF

Operating Temperature - Junction:: -65°C ~ 175°C

LL4448-7 FAQ

1.How can I place an order for LL4448-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for LL4448-7 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 LL4448-7 reliable?

The price and inventory of LL4448-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LL4448-7 is usually 5 days.

3.What payment methods are accepted for LL4448-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LL4448-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LL4448-7?

LL4448-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LL4448-7 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 LL4448-7?

For technical support, including LL4448-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LL4448-7 requirements.

6.How does Aetrix verify that LL4448-7 is sourced from the original manufacturer or authorized distributors?

All LL4448-7 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 LL4448-7 meets industry standards.

7.What is the process for return or replacement of LL4448-7?

All LL4448-7 units undergo pre-shipment inspection (PSI). If there is an issue with LL4448-7, 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 LL4448-7 part is unused and in its original packaging.

Return procedure for LL4448-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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