LL4448-7 Equivalent & Substitute Parts

Part Overview

The LL4448-7 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 75 V DC reverse voltage and 150 mA average rectified current in a surface mount SOD-80 MiniMELF package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. The LL4448-7 meets automotive-grade specifications with AEC-Q101 qualification and is RoHS3 compliant.

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 @ mA
Reverse Recovery Time (trr)	8	ns
Current - Reverse Leakage @ Vr	5	µA @ 75 V
Capacitance @ Vr, F	4	pF @ 0V, 1MHz
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Operating Temperature - Junction (Max)	175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LL4448-7 is determined by the following critical parameters: maximum reverse voltage (Vr), average rectified current (Io), forward voltage (Vf), reverse recovery time (trr), package type, and operating temperature range. All substitute parts must maintain the SOD-80 MiniMELF surface mount package configuration and support the 150 mA current rating.

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (Vishay LL4448 Series): Parts sharing the LL4448 base product number with identical or higher voltage ratings and matching electrical characteristics.

Parametric Equivalents (Vishay LS4148 Series and Comchip CDSL4148-G): Parts with matching 75 V reverse voltage, 150 mA current rating, and automotive-grade specifications, differing primarily in packaging options and product status.

Manufacturer-Recommended Alternative (Micro Commercial Co DL914): An active alternative from a different manufacturer meeting the core electrical specifications with comparable performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	trr [ns]	Package	Product Status	Grade	AEC-Q101
LL4448-7	Vishay	75	150	1 @ 100	8	SOD-80	Obsolete	Automotive	Yes
LL4448-GS08	Vishay	100	150	0.72 @ 5	8	SOD-80	Active	—	—
LS4148-GS08	Vishay	75	150	1 @ 50	8	SOD-80	Active	Automotive	Yes
LS4148-GS18	Vishay	75	150	1 @ 50	8	SOD-80	Active	Automotive	Yes
DL914	Micro Commercial Co	75	150	1 @ 10	4	SOD-80	Active	—	—
CDSL4148-G	Comchip Technology	75	150	1 @ 100	4	SOD-80	Obsolete	—	—

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

LS4148-GS08 and LS4148-GS18 are the primary active substitutes for the LL4448-7. Both parts maintain the automotive-grade classification and AEC-Q101 qualification of the original component. LS4148-GS08 and LS4148-GS18 are electrically and mechanically identical, differing only in packaging format (Cut Tape & Digi-Reel). Both are currently in active production status with substantial inventory availability (147,400 and 9,800 units respectively).

For Applications Permitting Voltage Derating:

LL4448-GS08 provides an active Vishay alternative with increased reverse voltage rating (100 V versus 75 V), maintaining the 150 mA current specification and SOD-80 package. This part is suitable for designs where higher voltage margin is beneficial, though it is not automotive-qualified.

For Non-Automotive Applications:

DL914 from Micro Commercial Co is an active alternative meeting the 75 V, 150 mA core specifications with faster reverse recovery time (4 ns versus 8 ns). This part is suitable for general-purpose applications where automotive qualification is not required.

Obsolete Parts:

CDSL4148-G from Comchip Technology is classified as obsolete and should not be selected for new designs despite parametric equivalence to the LL4448-7.

Frequently Asked Questions (FAQ)

Q: Can LL4448-GS08 directly replace LL4448-7 in all applications?

A: LL4448-GS08 is electrically compatible for applications operating at or below 75 V, as it is rated for 100 V maximum reverse voltage. However, LL4448-GS08 is not automotive-qualified. For automotive applications requiring AEC-Q101 certification, LS4148-GS08 or LS4148-GS18 are the appropriate selections.

Q: What is the difference between LS4148-GS08 and LS4148-GS18?

A: LS4148-GS08 and LS4148-GS18 are electrically and mechanically identical. The designation difference reflects packaging format: LS4148-GS08 is supplied in Cut Tape and Digi-Reel format, while LS4148-GS18 is also supplied in Cut Tape and Digi-Reel format. Both maintain identical electrical specifications, reverse voltage (75 V), current rating (150 mA), and automotive qualification.

Q: Is the SOD-80 MiniMELF package compatible across all substitute parts?

A: Yes. All listed substitute parts utilize the SOD-80 MiniMELF package (DO-213AC), ensuring mechanical and footprint compatibility with designs originally specified for the LL4448-7.

Q: Why is CDSL4148-G listed if it is obsolete?

A: CDSL4148-G is included in the substitute list as a parametric equivalent with matching electrical specifications (75 V, 150 mA, 8 ns recovery time). However, its obsolete status makes it unsuitable for new production. Active alternatives such as LS4148-GS08 or LS4148-GS18 are recommended.

Q: What is the significance of the reverse recovery time (trr) difference between DL914 (4 ns) and LL4448-7 (8 ns)?

A: The DL914 exhibits faster reverse recovery time (4 ns), which reduces switching losses in high-frequency applications. This characteristic may provide performance benefits in switching circuits but does not affect compatibility in standard rectification applications. The faster recovery time is not a limiting factor for substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, consistent with the LL4448-7 environmental classification.

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