LL4448-13 Equivalent & Substitute Parts

Part Overview

The LL4448-13 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, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LL4448-13 carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant, establishing baseline requirements for acceptable substitutes.

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)	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 LL4448-13 is determined by the following critical parameters:

Voltage Rating: The DC reverse voltage must equal or exceed 75 V. Parts rated at higher voltages (100 V) are acceptable as they provide additional margin.

Current Rating: The average rectified current must equal or exceed 150 mA. Parts rated at higher currents (200 mA, 300 mA) are acceptable as they provide additional capacity.

Package Compatibility: All substitutes must use the SOD-80 MiniMELF surface mount package (DO-213AC) to ensure mechanical and electrical compatibility with existing PCB layouts.

Reverse Recovery Time: The trr specification of 8 ns or lower is acceptable. Faster recovery times (4 ns) do not degrade circuit performance.

Reverse Leakage Current: The leakage specification of 5 µA @ 75 V or lower is acceptable. Lower leakage values improve performance.

Compliance Requirements: All substitutes must maintain automotive-grade qualification (AEC-Q101) and ROHS3 compliance to preserve design integrity and regulatory adherence.

Product Status: Active-status parts are preferred for long-term availability, though obsolete parts may serve as interim solutions.

Parameter Comparison

Parameter	LL4448-13	LL4448-GS18	LS4148-GS08	LS4148-GS18	FDLL4448-D87Z	CDSL4148-G
Manufacturer	Vishay	Vishay	Vishay	Vishay	onsemi	Comchip
Voltage - DC Reverse (Vr) (Max)	75 V	75 V	75 V	75 V	100 V	75 V
Current - Average Rectified (Io)	150 mA	300 mA	150 mA	150 mA	200 mA	150 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	1 V @ 50 mA	1 V @ 50 mA	1 V @ 50 mA	1 V @ 100 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	8 ns	8 ns	8 ns	8 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	25 nA @ 20 V	5 µA @ 75 V	5 µA @ 75 V	5 µA @ 75 V	2.5 µA @ 75 V
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	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 (Max)	175°C	175°C	175°C	175°C	175°C	175°C
Grade	Automotive	Automotive	Automotive	Automotive	—	—
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	—	—
Product Status	Obsolete	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents):

LS4148-GS08 and LS4148-GS18 are parametric equivalents manufactured by Vishay General Semiconductor - Diodes Division. Both parts maintain identical voltage (75 V), current (150 mA), and package specifications as the LL4448-13. Both are active-status products with AEC-Q101 qualification and ROHS3 compliance. LS4148-GS08 is available in higher inventory (147,400 pcs) compared to LS4148-GS18 (9,800 pcs), making LS4148-GS08 the preferred choice for procurement continuity.

Secondary Substitute (Upgraded Ratings):

LL4448-GS18 is a direct Vishay manufacturer part with identical voltage rating (75 V) but elevated current capacity (300 mA). This part is active-status with AEC-Q101 qualification and ROHS3 compliance. The higher current rating provides design margin without compromising compatibility. Inventory availability is substantial (120,100 pcs).

Alternative Substitute (Higher Voltage Rating):

FDLL4448-D87Z is manufactured by onsemi and provides upgraded voltage rating (100 V) and current capacity (200 mA). This part is active-status and ROHS3 compliant. However, automotive-grade qualification and AEC-Q101 certification are not specified for this part. The 100 V rating exceeds the LL4448-13 requirement and is acceptable for applications requiring additional voltage margin.

Obsolete Alternative:

CDSL4148-G is manufactured by Comchip Technology and maintains identical voltage (75 V) and current (150 mA) specifications. This part is obsolete-status, limiting its suitability for new designs or long-term procurement. It is ROHS3 compliant but lacks specified automotive-grade qualification.

Recommended Selection Priority:

LS4148-GS08 (parametric equivalent, active, high inventory)
LS4148-GS18 (parametric equivalent, active, lower inventory)
LL4448-GS18 (upgraded ratings, active, high inventory)
FDLL4448-D87Z (higher voltage margin, active, non-automotive qualified)

Frequently Asked Questions (FAQ)

Q: Can LS4148-GS08 directly replace LL4448-13 without circuit modification?

A: Yes. LS4148-GS08 is a parametric equivalent with identical voltage (75 V), current (150 mA), reverse recovery time (8 ns), reverse leakage (5 µA @ 75 V), and package (SOD-80 MiniMELF). Both parts are AEC-Q101 qualified and ROHS3 compliant. No circuit modification is required.

Q: Why is LL4448-GS18 listed as a substitute if it has higher current rating (300 mA)?

A: Higher current ratings are acceptable substitutes because they provide additional capacity without reducing performance. The 300 mA rating of LL4448-GS18 exceeds the 150 mA requirement of LL4448-13, ensuring the part can handle the same or greater load. Voltage rating, package, and compliance specifications remain identical.

Q: Is FDLL4448-D87Z suitable for automotive applications?

A: FDLL4448-D87Z is active-status and ROHS3 compliant. However, automotive-grade qualification and AEC-Q101 certification are not specified in the provided data. If automotive qualification is a design requirement, LS4148-GS08, LS4148-GS18, or LL4448-GS18 are preferred.

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

A: Both parts are parametric equivalents with identical electrical specifications (75 V, 150 mA, 8 ns trr, 5 µA leakage). The primary difference is packaging: LS4148-GS08 is supplied in Cut Tape (CT) and Digi-Reel format with higher inventory (147,400 pcs), while LS4148-GS18 is supplied in Cut Tape (CT) and Digi-Reel format with lower inventory (9,800 pcs). LS4148-GS08 is recommended for procurement continuity.

Q: Can CDSL4148-G be used as a long-term replacement?

A: CDSL4148-G is parametric equivalent with identical voltage (75 V) and current (150 mA) specifications. However, it is classified as obsolete-status, which limits availability for future procurement. For new designs or long-term support, active-status alternatives (LS4148-GS08, LS4148-GS18, or LL4448-GS18) are recommended.

Q: Are all substitute parts compatible with the SOD-80 MiniMELF package footprint?

A: Yes. All listed substitutes use the DO-213AC, MINI-MELF, SOD-80 package. PCB footprints and mechanical compatibility are identical across all parts listed in this reference.

Q: What is the significance of reverse recovery time (trr) in substitute selection?

A: Reverse recovery time affects switching speed and switching losses. The LL4448-13 specifies 8 ns trr. Substitutes with equal or faster trr (4 ns or 8 ns) are acceptable. Faster recovery times do not degrade circuit performance and may improve efficiency in high-frequency applications.

Q: Why is reverse leakage current important for substitution?

A: Reverse leakage current affects circuit performance in high-impedance applications and power consumption. The LL4448-13 specifies 5 µA @ 75 V. Substitutes with equal or lower leakage (2.5 µA, 5 µA, or 25 nA) are acceptable. Lower leakage values improve performance characteristics.

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