LL4148-7 Equivalent & Substitute Parts

Part Overview

The LL4148-7 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 production continuity. Substitute parts are selected based on electrical performance parameters, package compatibility, and thermal operating ranges that satisfy the functional requirements of the original specification.

Key Parameters

Parameter	LL4148-7 Specification
Voltage - DC Reverse (Vr) (Max)	75 V
Current - Average Rectified (Io)	150 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 10 mA
Reverse Recovery Time (trr)	4 ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed
Package / Case	DO-213AC, MINI-MELF, SOD-80
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 175°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LL4148-7 are classified into three categories based on substitution relationship and electrical compatibility:

MFR Recommended Substitutes are manufacturer-designated alternatives that provide enhanced or equivalent electrical performance with active product status. These parts maintain or exceed the reverse voltage rating (75 V minimum), support the required current capacity (150 mA minimum), and operate within compatible temperature ranges.

Direct Manufacturer Substitutes are parts from the same manufacturer family (Vishay LL4151 series) that share the Mini MELF package form factor and maintain electrical compatibility within specified parameter ranges.

Parametric Equivalents are parts with identical electrical specifications and package compatibility, sourced from alternative manufacturers, providing functional interchangeability for the original LL4148-7 design.

Substitution eligibility is determined by the following criteria:

Reverse voltage rating ≥ 75 V
Average rectified current ≥ 150 mA
Reverse recovery time ≤ 4 ns or compatible with application timing requirements
Package compatibility: Mini MELF (DO-213AC, SOD-80) or equivalent surface mount form factor
Operating temperature range encompassing -65°C to 175°C or application-specific subset
RoHS3 compliance for environmental regulation alignment

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (mA)	Vf (Max) @ If	trr (ns)	Ir @ Vr	Package	Status
LL4148-7	Diodes Incorporated	75 V	150	1 V @ 10 mA	4	5 µA @ 75 V	Mini MELF	Obsolete
1N4148W-7-F	Diodes Incorporated	100 V	300	1.25 V @ 150 mA	4	1 µA @ 100 V	SOD-123	Active
LL4151-M-08	Vishay General Semiconductor	50 V	300	1 V @ 50 mA	4	50 nA @ 50 V	Mini MELF	Active
LL4151-M-18	Vishay General Semiconductor	50 V	300	1 V @ 50 mA	4	50 nA @ 50 V	Mini MELF	Active
BAS32L,135	NXP Semiconductors	75 V	200	1 V @ 100 mA	4	5 µA @ 75 V	Mini MELF	Active
CDLL4148	Microchip Technology	75 V	200	1 V @ 200 mA	20	500 nA @ 75 V	DO-213AA	Active
MMSD4148T1G	onsemi	100 V	200	1 V @ 10 mA	4	5 µA @ 75 V	SOD-123	Active
PMLL4153,115	Nexperia USA Inc.	50 V	200	880 mV @ 50 mA	4	50 nA @ 50 V	Mini MELF	Active
LL4148 L0G	Taiwan Semiconductor Corporation	75 V	150	1 V @ 50 mA	4	5 µA @ 75 V	Mini MELF	Active
LL4448 L0G	Taiwan Semiconductor Corporation	75 V	150	1 V @ 100 mA	4	5 µA @ 75 V	Mini MELF	Active
LL4448 L1G	Taiwan Semiconductor Corporation	75 V	150	1 V @ 100 mA	54	5 µA @ 75 V	Mini MELF	Active

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

LL4148 L0G (Taiwan Semiconductor Corporation) and LL4448 L0G (Taiwan Semiconductor Corporation) are parametric equivalents with identical reverse voltage (75 V), current rating (150 mA), and Mini MELF package form factor. Both parts are RoHS3 compliant and active in production status. LL4148 L0G provides the closest electrical match with forward voltage specification at 50 mA test condition. LL4448 L0G offers equivalent performance with forward voltage specified at 100 mA. Both support the full operating temperature range of -65°C to 175°C.

Secondary Substitutes with Enhanced Performance:

BAS32L,135 (NXP Semiconductors) and PMLL4153,115 (Nexperia USA Inc.) provide higher current capacity (200 mA) while maintaining 75 V and 50 V reverse voltage ratings respectively. Both are available in Mini MELF package and RoHS3 compliant. BAS32L,135 matches the 75 V rating of the original part with 200 mA capacity. PMLL4153,115 operates at 50 V with 200 mA capacity and features lower reverse leakage (50 nA @ 50 V).

Alternative Package Options:

1N4148W-7-F (Diodes Incorporated) and MMSD4148T1G (onsemi) provide higher voltage ratings (100 V) and enhanced current capacity (300 mA and 200 mA respectively) in SOD-123 surface mount package. These parts are suitable for applications where package size reduction is acceptable and higher voltage margin is beneficial. Both are RoHS3 compliant and active in production.

Voltage-Reduced Alternatives:

LL4151-M-08 and LL4151-M-18 (Vishay General Semiconductor) operate at 50 V reverse voltage with 300 mA current capacity in Mini MELF package. These parts are AEC-Q101 qualified and suitable for applications where the 75 V rating of the original part exceeds system requirements. Both are active in production with RoHS3 compliance.

Compliance Considerations:

CDLL4148 (Microchip Technology) is RoHS non-compliant and should be selected only for applications where RoHS compliance is not required. This part features a longer reverse recovery time (20 ns) compared to the 4 ns specification of the original LL4148-7.

Frequently Asked Questions (FAQ)

Q: Can LL4148 L0G directly replace LL4148-7 in existing designs?

A: Yes. LL4148 L0G is a parametric equivalent with identical reverse voltage (75 V), current rating (150 mA), and Mini MELF package. Both parts share the same operating temperature range (-65°C to 175°C) and RoHS3 compliance status. The part is active in production, addressing the obsolescence of LL4148-7.

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

A: Both parts are parametric equivalents of LL4148-7 with identical reverse voltage (75 V) and current rating (150 mA) in Mini MELF package. The primary difference is reverse recovery time: LL4448 L0G specifies 4 ns, while LL4448 L1G specifies 54 ns. Selection depends on application timing requirements. LL4448 L0G is preferred for applications requiring fast switching characteristics.

Q: Can I use BAS32L,135 as a substitute if my application only requires 150 mA?

A: Yes. BAS32L,135 is rated for 200 mA average rectified current, which exceeds the 150 mA requirement of LL4148-7. The part maintains the 75 V reverse voltage rating and Mini MELF package compatibility. Higher current rating provides design margin without affecting circuit performance in current-limited applications.

Q: Why would I select 1N4148W-7-F over LL4148 L0G?

A: 1N4148W-7-F provides higher reverse voltage (100 V) and current capacity (300 mA) compared to LL4148-7 specifications (75 V, 150 mA). The trade-off is package change from Mini MELF to SOD-123. Selection depends on whether the application requires higher voltage margin and whether PCB layout can accommodate the different package footprint.

Q: Are LL4151-M-08 and LL4151-M-18 suitable substitutes for LL4148-7?

A: LL4151-M-08 and LL4151-M-18 are suitable only for applications where the 75 V reverse voltage requirement can be reduced to 50 V. Both parts provide higher current capacity (300 mA) and maintain Mini MELF package compatibility. These parts are AEC-Q101 qualified and active in production. Voltage derating must be evaluated against circuit design margins.

Q: What is the impact of selecting CDLL4148 instead of LL4148 L0G?

A: CDLL4148 maintains the 75 V reverse voltage and 200 mA current rating with DO-213AA package compatibility. The primary differences are: reverse recovery time increases from 4 ns to 20 ns, reverse leakage increases from 5 µA to 500 nA, and RoHS compliance status changes from compliant to non-compliant. CDLL4148 is suitable only for applications where RoHS compliance is not required and slower switching characteristics are acceptable.

Q: Can PMLL4153,115 be used in place of LL4148-7?

A: PMLL4153,115 is suitable for applications where the 75 V reverse voltage requirement can be reduced to 50 V. The part provides 200 mA current capacity (exceeding the 150 mA requirement) and maintains Mini MELF package compatibility. Forward voltage is specified at 880 mV @ 50 mA, which is lower than LL4148-7 at 1 V @ 10 mA. Voltage derating and forward voltage characteristics must be evaluated for circuit compatibility.

Q: What packaging considerations apply when selecting substitute parts?

A: LL4148-7 uses Mini MELF (DO-213AC, SOD-80) package. Direct package-compatible substitutes include LL4148 L0G, LL4448 L0G, LL4448 L1G, BAS32L,135, and PMLL4153,115. Alternative packages include SOD-123 (1N4148W-7-F, MMSD4148T1G) and DO-213AA (CDLL4148). Package changes require PCB layout modification and footprint verification. Mini MELF package substitutes require no layout changes.

Q: Which substitute offers the best overall compatibility with LL4148-7?

A: LL4148 L0G provides the highest compatibility with identical electrical specifications (75 V, 150 mA, 4 ns trr), Mini MELF package, full operating temperature range (-65°C to 175°C), and RoHS3 compliance. The part is active in production with 9,864 units in stock, addressing obsolescence concerns of the original LL4148-7.

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