LL4148 L0G Equivalent & Substitute Parts

Part Overview

The LL4148 L0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 75 V DC reverse voltage and 150 mA average rectified current in a Surface Mount Mini MELF package. This component is classified as a small signal diode with a reverse recovery time of 4 ns, suitable for high-speed switching applications. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative sources and packaging configurations are documented to support procurement flexibility and supply chain continuity.

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 @ 50 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5	µA @ 75 V
Capacitance @ Vr, F	4	pF @ 0V, 1MHz
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 eligibility for the LL4148 L0G is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 75 V
Current - Average Rectified (Io): 150 mA
Package / Case: DO-213AC, MINI-MELF, SOD-80
Mounting Type: Surface Mount
Speed Classification: Small Signal ≤ 200mA (Io), Any Speed

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Tolerance permitted at different measurement currents (50 mA vs. 100 mA)
Reverse Recovery Time (trr): Variation within small signal diode classification (4 ns to 54 ns)
Current - Reverse Leakage @ Vr: Variation within specified voltage rating (2.5 µA to 5 µA)
Packaging Configuration: Cut Tape (CT) or Tape & Reel (TR) formats

Compliance Requirements:

RoHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Unaffected status

Substitute parts are classified as Parametric Equivalent when all mandatory parameters match exactly, or Similar when current rating or speed classification differs while maintaining functional compatibility within the application envelope.

Parameter Comparison

Parameter	LL4148 L0G	LL4448 L0G	LL4448 L1G	CDSL4148-G	LL4448-GS18
Manufacturer	Taiwan Semiconductor	Taiwan Semiconductor	Taiwan Semiconductor	Comchip Technology	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	75 V	75 V	75 V	75 V	75 V
Current - Average Rectified (Io)	150 mA	150 mA	150 mA	150 mA	300 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 50 mA	1 V @ 100 mA	1 V @ 100 mA	1 V @ 100 mA	1 V @ 50 mA
Speed Classification	Small Signal ≤ 200mA, Any Speed	Small Signal ≤ 200mA, Any Speed	Small Signal ≤ 200mA, Any Speed	Small Signal ≤ 200mA, Any Speed	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	4 ns	4 ns	54 ns	4 ns	8 ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	5 µA @ 75 V	5 µA @ 75 V	2.5 µA @ 75 V	25 nA @ 20 V
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	4 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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Cut Tape (CT)	Cut Tape (CT)	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)
Operating Temperature - Junction	-65 to 175 °C	-65 to 175 °C	-65 to 175 °C	Max 175 °C	Max 175 °C
Product Status	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent Substitutes (Direct Replacement):

LL4448 L0G and LL4448 L1G are parametric equivalents of the LL4148 L0G, maintaining identical voltage and current ratings with matching package specifications. Both parts are manufactured by Taiwan Semiconductor Corporation with Active product status. LL4448 L0G is supplied in Cut Tape format identical to the main part, while LL4448 L1G is supplied in Tape & Reel format for high-volume applications. The forward voltage measurement point differs (100 mA vs. 50 mA), and LL4448 L1G exhibits extended reverse recovery time (54 ns vs. 4 ns), remaining within small signal diode classification. Both parts maintain full RoHS3 compliance and unlimited moisture sensitivity rating.

Similar Substitute (Functional Compatibility):

CDSL4148-G, manufactured by Comchip Technology, maintains equivalent voltage, current, and package specifications. This part carries Obsolete product status and exhibits lower reverse leakage current (2.5 µA vs. 5 µA). Operating temperature specification is provided as maximum value only (175°C) rather than a range. CDSL4148-G is suitable for applications where component availability from active manufacturers is prioritized over legacy sourcing.

Similar Substitute (Enhanced Performance):

LL4448-GS18, manufactured by Vishay General Semiconductor - Diodes Division, is classified as a fast recovery diode with 300 mA current rating, exceeding the 150 mA specification of the main part. This part is qualified to AEC-Q101 automotive standard and exhibits significantly lower reverse leakage current (25 nA @ 20 V). The higher current rating and faster recovery characteristics (8 ns) position this part for applications requiring enhanced performance margins. Mechanical compatibility is maintained through identical package specifications.

Recommendation Basis:

Selection among equivalent and substitute parts is determined by product status (Active vs. Obsolete), packaging format requirements (Cut Tape vs. Tape & Reel), and application-specific performance margins. Active status parts (LL4448 L0G, LL4448 L1G, LL4448-GS18) are preferred for new designs. Obsolete status parts (CDSL4148-G) are retained for legacy system support only. Enhanced performance variants (LL4448-GS18) are selected when application requirements exceed base specifications.

Frequently Asked Questions (FAQ)

Q: Can LL4448 L0G replace LL4148 L0G in all applications?

A: LL4448 L0G is a parametric equivalent with identical voltage (75 V), current (150 mA), and package specifications (DO-213AC, MINI-MELF, SOD-80). Both parts are manufactured by Taiwan Semiconductor Corporation with Active product status and full RoHS3 compliance. The forward voltage measurement point differs (100 mA vs. 50 mA), but both values remain within 1 V specification. Direct substitution is supported without circuit modification.

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

A: Both parts are parametric equivalents with identical electrical ratings. The primary difference is packaging format: LL4448 L0G is supplied in Cut Tape (CT) format, while LL4448 L1G is supplied in Tape & Reel (TR) format. LL4448 L1G exhibits extended reverse recovery time (54 ns vs. 4 ns), remaining within small signal diode classification. Selection is based on procurement volume and assembly equipment compatibility.

Q: Why is CDSL4148-G listed as Obsolete?

A: CDSL4148-G, manufactured by Comchip Technology, carries Obsolete product status. This designation indicates the part is no longer in active production. The part maintains equivalent electrical specifications (75 V, 150 mA, 4 ns recovery time) and package compatibility. CDSL4148-G is retained in the substitute list for legacy system support and repair applications only. Active status alternatives (LL4448 L0G, LL4448 L1G) are recommended for new designs.

Q: Can LL4448-GS18 be used as a direct replacement?

A: LL4448-GS18 is classified as a Similar substitute rather than a Parametric Equivalent. The part maintains identical voltage (75 V) and package specifications (DO-213AC, MINI-MELF, SOD-80), but features doubled current rating (300 mA vs. 150 mA) and fast recovery classification (8 ns vs. 4 ns small signal). LL4448-GS18 is qualified to AEC-Q101 automotive standard with significantly lower reverse leakage (25 nA @ 20 V). Substitution is supported for applications requiring enhanced performance margins, but circuit validation is recommended due to different speed classification.

Q: What packaging formats are available for LL4148 L0G equivalents?

A: Parametric equivalents are available in two packaging formats: Cut Tape (CT) format for LL4448 L0G, and Tape & Reel (TR) format for LL4448 L1G. Both formats maintain identical DO-213AC, MINI-MELF, SOD-80 package specifications. Cut Tape format is suitable for lower-volume applications and manual assembly. Tape & Reel format is optimized for high-volume automated assembly processes. Selection is based on procurement volume and assembly equipment configuration.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts (LL4448 L0G, LL4448 L1G, CDSL4148-G, LL4448-GS18) maintain ROHS3 Compliant status. All parts carry Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. All parts are REACH Unaffected. Compliance specifications are identical across the main part and all substitutes.

Q: What is the operating temperature range for substitute parts?

A: LL4148 L0G, LL4448 L0G, and LL4448 L1G specify operating temperature range of -65°C to 175°C (junction). CDSL4148-G and LL4448-GS18 specify maximum operating temperature of 175°C (junction) without lower limit specification. All parts are suitable for industrial temperature range applications. Application-specific temperature requirements should be verified against the specified operating range.

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