LL4448-7 Equivalent & Substitute Parts

Part Overview

The LL4448-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 75 V DC reverse voltage and 150 mA average rectified current in a Mini MELF surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical or superior electrical performance within the same package family, while substitute parts offer functional alternatives with modified electrical characteristics or packaging formats.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	150	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	µA
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LL4448-7 is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), reverse recovery time (trr), and package compatibility. Parts are classified into two substitution categories:

Manufacturer Recommended Substitutes maintain functional equivalence with identical or superior electrical ratings and active product status. These parts are approved alternatives for direct replacement in circuit applications.

Parametric Equivalents share identical core electrical specifications (Vr, Io, Vf, trr, leakage current) and package format, enabling pin-for-pin substitution with equivalent performance characteristics.

The following parameters establish substitution validity:

Reverse voltage rating must equal or exceed 75 V
Average rectified current must equal or exceed 150 mA
Forward voltage drop must not exceed specified limits
Reverse recovery time must be compatible with circuit switching requirements
Package format must support surface mount assembly in Mini MELF or equivalent form factor

Parameter Comparison

Parameter	LL4448-7 (Main)	1N4448W-7-F	PMLL4153,115	LL4148 L0G	LL4448 L0G	LL4448 L1G
Manufacturer	Diodes Inc.	Diodes Inc.	Nexperia USA Inc.	Taiwan Semiconductor	Taiwan Semiconductor	Taiwan Semiconductor
Voltage - DC Reverse (Vr) (Max)	75 V	75 V	50 V	75 V	75 V	75 V
Current - Average Rectified (Io)	150 mA	250 mA	200 mA	150 mA	150 mA	150 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	1.25 V @ 150 mA	880 mV @ 50 mA	1 V @ 50 mA	1 V @ 100 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	4 ns	4 ns	4 ns	4 ns	4 ns	54 ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	2.5 µA @ 75 V	50 nA @ 50 V	5 µA @ 75 V	5 µA @ 75 V	5 µA @ 75 V
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Operating Temperature - Junction	-65 to 175°C	-65 to 150°C	Up to 200°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)	Tape & Reel (TR)

Engineering Selection Recommendations

1N4448W-7-F (Diodes Incorporated) is the manufacturer-recommended primary substitute. This part maintains 75 V reverse voltage rating and 4 ns reverse recovery time identical to the LL4448-7. The 1N4448W-7-F provides superior current handling at 250 mA versus 150 mA, with lower reverse leakage current (2.5 µA versus 5 µA). The SOD-123 package differs from the Mini MELF format; PCB layout modification is required. Product status is active with full ROHS3 compliance. Operating temperature range is -65 to 150°C, which is 25°C lower than the LL4448-7 maximum.

LL4448 L0G (Taiwan Semiconductor) provides parametric equivalence with identical electrical specifications and Mini MELF package compatibility. This part matches the LL4448-7 in reverse voltage (75 V), current rating (150 mA), forward voltage (1 V @ 100 mA), and reverse recovery time (4 ns). Operating temperature range extends to 175°C. Product status is active. Packaging is Cut Tape format; Tape & Reel format is available as LL4448 L1G. REACH status is unaffected.

LL4448 L1G (Taiwan Semiconductor) is identical to LL4448 L0G with Tape & Reel packaging. Reverse recovery time specification is 54 ns, which differs from the LL4448-7 baseline of 4 ns. This extended recovery time may affect high-frequency switching performance. Product status is active with full ROHS3 compliance.

LL4148 L0G (Taiwan Semiconductor) provides parametric equivalence with identical 75 V reverse voltage, 150 mA current rating, and 4 ns reverse recovery time. Forward voltage specification differs at 1 V @ 50 mA versus 1 V @ 100 mA. Mini MELF package format is compatible. Product status is active. Packaging is Cut Tape format.

PMLL4153,115 (Nexperia USA Inc.) is a functional substitute with reduced reverse voltage rating of 50 V, which is below the LL4448-7 specification of 75 V. This part is suitable only for applications with maximum operating voltages not exceeding 50 V. Current rating is 200 mA, exceeding the 150 mA requirement. Mini MELF package format is compatible. Product status is active. Operating temperature extends to 200°C maximum. REACH status is unaffected.

Frequently Asked Questions (FAQ)

Q: Can the 1N4448W-7-F replace the LL4448-7 in all applications?

A: The 1N4448W-7-F is electrically compatible for applications requiring 75 V reverse voltage and 150 mA current. However, the SOD-123 package differs from the Mini MELF format of the LL4448-7, requiring PCB layout redesign. Operating temperature maximum is 150°C versus 175°C for the LL4448-7. Verify thermal requirements before substitution.

Q: What is the difference between LL4448 L0G and LL4448 L1G?

A: Both parts are manufactured by Taiwan Semiconductor with identical electrical specifications and Mini MELF packaging. The primary difference is packaging format: LL4448 L0G is supplied in Cut Tape, while LL4448 L1G is supplied in Tape & Reel. Additionally, LL4448 L1G specifies reverse recovery time of 54 ns compared to 4 ns for LL4448 L0G, which may impact switching performance in high-frequency circuits.

Q: Is PMLL4153,115 suitable as a direct replacement?

A: PMLL4153,115 is not a direct replacement due to reduced reverse voltage rating of 50 V versus 75 V for the LL4448-7. This part is suitable only for circuits with maximum operating voltages not exceeding 50 V. Mini MELF package format is compatible. Verify circuit voltage requirements before substitution.

Q: What packaging considerations apply to these substitutes?

A: The LL4448-7 uses Mini MELF (DO-213AC, SOD-80) package format. Parametric equivalents LL4148 L0G, LL4448 L0G, and LL4448 L1G maintain this package format with identical pin configuration. The 1N4448W-7-F uses SOD-123 package, requiring PCB redesign. PMLL4153,115 maintains Mini MELF compatibility. Verify PCB footprint compatibility before component selection.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The LL4448-7 is also ROHS3 compliant. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions.

Q: Which substitute offers the best thermal performance?

A: PMLL4153,115 specifies maximum operating temperature of 200°C, exceeding all other parts. However, this part has reduced reverse voltage rating of 50 V. For applications requiring both high voltage (75 V) and high temperature operation, LL4448 L0G and LL4448 L1G support -65 to 175°C range, matching the LL4448-7 specification.

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) affects switching speed in high-frequency applications. The LL4448-7 specifies 4 ns. Parametric equivalents LL4148 L0G, LL4448 L0G, and 1N4448W-7-F maintain 4 ns specification. LL4448 L1G specifies 54 ns, which is significantly longer and may degrade performance in circuits requiring fast switching transitions. Verify circuit frequency requirements before selecting LL4448 L1G.

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