LL4148-13 Equivalent & Substitute Parts

Part Overview

The LL4148-13 is a small signal rectifier diode manufactured by Diodes Incorporated, designed for general-purpose switching and signal detection applications. This device features a 75 V reverse voltage rating, 150 mA average rectified current, and operates across a junction temperature range of -65°C to 175°C. The part is packaged in a Surface Mount Mini MELF (SOD-80) configuration.

The LL4148-13 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this component.

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 @ 10 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5	µA @ 75 V
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LL4148-13 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 75 V
Current - Average Rectified (Io) must equal or exceed 150 mA
Reverse Recovery Time (trr) must equal or be faster than 4 ns
Forward voltage characteristics must remain within acceptable operating margins
Reverse leakage current must not significantly exceed specified limits

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package compatibility: Parts in SOD-80 (DO-213AC, MINI-MELF) or equivalent compact surface mount packages
Operating temperature range must support the application's thermal requirements

Compliance Criteria:

RoHS3 compliance status
REACH compliance status
Moisture Sensitivity Level (MSL) rating

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary electrical and mechanical parameters within the same package family) and Functional Alternatives (meeting or exceeding electrical specifications with compatible packaging but potentially different manufacturers or package variants).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	trr [ns]	Package	Status	RoHS
LL4148-13	Diodes Incorporated	75	150	1.0 @ 10mA	4	SOD-80	Obsolete	ROHS3
LS4148-GS18	Vishay General Semiconductor	75	150	1.0 @ 50mA	8	SOD-80	Active	ROHS3
CDSL4148-G	Comchip Technology	75	150	1.0 @ 100mA	4	SOD-80	Obsolete	ROHS3
PMLL4148L,115	Nexperia USA Inc.	75	200	1.0 @ 50mA	4	SOD-80	Active	ROHS3
PMLL4148L,135	Nexperia USA Inc.	75	200	1.0 @ 50mA	4	SOD-80	Active	ROHS3
CDLL4148	Microchip Technology	75	200	1.0 @ 200mA	20	DO-213AA	Active	Non-compliant
MMSD4148T1G	onsemi	100	200	1.0 @ 10mA	4	SOD-123	Active	ROHS3
1N4148W-13-F	Diodes Incorporated	100	300	1.25 @ 150mA	4	SOD-123	Active	ROHS3
LL4151-M-08	Vishay General Semiconductor	50	300	1.0 @ 50mA	4	SOD-80	Active	ROHS3
LL4151-M-18	Vishay General Semiconductor	50	300	1.0 @ 50mA	4	SOD-80	Active	ROHS3
PMLL4153,115	Nexperia USA Inc.	50	200	0.88 @ 50mA	4	SOD-80	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

LS4148-GS18 (Vishay General Semiconductor) is the recommended primary substitute. This part maintains identical voltage and current ratings (75 V, 150 mA) in the same SOD-80 package. The part carries Active product status, ensuring long-term availability and supply chain stability. RoHS3 compliance is maintained. The reverse recovery time of 8 ns is slightly slower than the original 4 ns specification but remains within acceptable parameters for small signal applications. AEC-Q101 automotive qualification provides additional reliability assurance.

PMLL4148L,115 and PMLL4148L,135 (Nexperia USA Inc.) provide functional equivalence with enhanced current capability (200 mA versus 150 mA). Both parts maintain the 75 V reverse voltage rating and 4 ns reverse recovery time. Active product status and RoHS3 compliance are confirmed. The higher current rating provides design margin for applications approaching the original 150 mA specification. Both parts are available in SOD-80 packaging.

Secondary Substitutes (Functional Alternatives):

MMSD4148T1G (onsemi) offers increased voltage rating (100 V) and current capability (200 mA) with matching 4 ns reverse recovery time. This part is packaged in SOD-123, a compact surface mount package compatible with modern PCB designs. Active product status and RoHS3 compliance are confirmed. The SOD-123 package is smaller than SOD-80, requiring PCB layout verification.

1N4148W-13-F (Diodes Incorporated) provides the highest voltage rating (100 V) and current capacity (300 mA) among available substitutes. Packaged in SOD-123, this part offers design flexibility for applications requiring enhanced electrical margins. Active product status and RoHS3 compliance are confirmed. Forward voltage increases to 1.25 V at 150 mA, which may impact circuit performance in voltage-sensitive applications.

Not Recommended:

CDLL4148 (Microchip Technology) carries RoHS non-compliance status and exhibits significantly longer reverse recovery time (20 ns), making it unsuitable for modern applications requiring RoHS3 compliance.

LL4151-M-08 and LL4151-M-18 (Vishay General Semiconductor) feature reduced voltage rating (50 V), which is insufficient for applications designed around the 75 V specification of the LL4148-13.

PMLL4153,115 (Nexperia USA Inc.) also features reduced voltage rating (50 V) and is not suitable as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can LS4148-GS18 directly replace LL4148-13 without circuit modification?

A: LS4148-GS18 maintains identical voltage (75 V) and current (150 mA) ratings in the same SOD-80 package. The 8 ns reverse recovery time is slower than the original 4 ns specification. For applications where reverse recovery time is not a critical parameter, direct substitution is acceptable. For high-frequency switching applications, circuit performance should be evaluated.

Q: What is the primary advantage of PMLL4148L,115 over LS4148-GS18?

A: PMLL4148L,115 provides higher current capacity (200 mA versus 150 mA) while maintaining the faster 4 ns reverse recovery time. This part offers additional design margin for applications operating near the original current specification. Both parts are available in SOD-80 packaging and maintain 75 V voltage rating.

Q: Why is MMSD4148T1G packaged differently (SOD-123 versus SOD-80)?

A: SOD-123 is a smaller surface mount package than SOD-80 (MINI-MELF). While electrically compatible, SOD-123 requires different PCB footprint and land pattern design. This package change may require PCB layout revision. MMSD4148T1G offers higher voltage (100 V) and current (200 mA) ratings, providing enhanced electrical performance in a more compact form factor.

Q: Is RoHS compliance important for substitute selection?

A: RoHS3 compliance is mandatory for applications subject to European Union Restriction of Hazardous Substances regulations. All recommended substitutes maintain ROHS3 compliance status. CDLL4148 carries RoHS non-compliance status and should not be selected for regulated applications.

Q: Can LL4151-M-08 or LL4151-M-18 be used as substitutes?

A: No. These parts feature 50 V reverse voltage rating, which is insufficient for applications designed around the 75 V specification of LL4148-13. Using a lower voltage-rated diode in a 75 V application creates risk of component failure and circuit malfunction.

Q: What is the difference between PMLL4148L,115 and PMLL4148L,135?

A: Both parts are electrically identical with 75 V rating and 200 mA current capacity. The difference is in packaging configuration: PMLL4148L,115 is supplied in Cut Tape (CT) & Digi-Reel format, while PMLL4148L,135 is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly requirements.

Q: Does forward voltage variation affect circuit performance?

A: Forward voltage differences become significant in precision analog circuits and low-voltage applications. LL4148-13 specifies 1.0 V at 10 mA, while 1N4148W-13-F specifies 1.25 V at 150 mA. For voltage-sensitive applications, circuit simulation or prototype testing is necessary to confirm performance with substitute parts.

Q: Are automotive-qualified parts available?

A: Yes. LS4148-GS18 and LL4151-M-08/M-18 carry AEC-Q101 automotive qualification. These parts are suitable for automotive and high-reliability applications requiring formal qualification documentation.

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