DL4151-TP Equivalent & Substitute Parts

Part Overview

The DL4151-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 75 V DC reverse voltage and 150 mA average rectified current in a Surface Mount Mini MELF package (DO-213AC, SOD-80). This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs.

Key Parameters

Parameter	DL4151-TP Value
Voltage - DC Reverse (Vr) (Max)	75 V
Current - Average Rectified (Io)	150 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 50 mA
Reverse Recovery Time (trr)	2 ns
Current - Reverse Leakage @ Vr	50 nA @ 50 V
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed
Package / Case	DO-213AC, MINI-MELF, SOD-80
Mounting Type	Surface Mount
Operating Temperature - Junction (Max)	175°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DL4151-TP is determined by the following critical parameters:

Voltage Rating: The substitute must support a minimum DC reverse voltage of 75 V to maintain circuit protection and reliability.

Current Rating: The substitute must support a minimum average rectified current of 150 mA to handle the intended load without thermal stress.

Package Compatibility: The substitute must be compatible with Surface Mount assembly processes and fit within the same footprint constraints (DO-213AC, MINI-MELF, SOD-80 packages).

Speed Classification: The substitute must operate within the Small Signal classification (≤ 200mA) or faster speed categories to ensure proper switching behavior.

Compliance: All substitutes must maintain ROHS3 compliance and equivalent environmental certifications.

The substitute parts are grouped into two categories:

Parametric Equivalents (LS4148-GS08, LS4148-GS18, CDSL4148-G): These parts match or exceed the voltage, current, and package specifications of the DL4151-TP while maintaining the same physical form factor and speed classification.

Functional Alternatives (1N4448W-TP, PMLL4153,115): These parts meet the voltage and current requirements but differ in package form factor or current rating, suitable for applications where package flexibility exists.

Parameter Comparison

Parameter	DL4151-TP	LS4148-GS08	LS4148-GS18	CDSL4148-G	1N4448W-TP	PMLL4153,115
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Comchip Technology	Micro Commercial Co	Nexperia USA Inc.
Voltage - DC Reverse (Vr) (Max)	75 V	75 V	75 V	75 V	75 V	50 V
Current - Average Rectified (Io)	150 mA	150 mA	150 mA	150 mA	250 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 50 mA	1 V @ 50 mA	1 V @ 50 mA	1 V @ 100 mA	1 V @ 100 mA	880 mV @ 50 mA
Reverse Recovery Time (trr)	2 ns	8 ns	8 ns	4 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	50 nA @ 50 V	5 µA @ 75 V	5 µA @ 75 V	2.5 µA @ 75 V	2.5 µA @ 75 V	50 nA @ 50 V
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	Small Signal ≤ 200mA, Any Speed
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	SOD-123	DO-213AC, MINI-MELF, SOD-80
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	175°C	175°C	175°C	175°C	150°C	200°C
Product Status	Obsolete	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents)

LS4148-GS08 and LS4148-GS18 from Vishay General Semiconductor are the preferred substitutes for the DL4151-TP. Both parts maintain identical voltage (75 V), current (150 mA), and package specifications (DO-213AC, MINI-MELF, SOD-80). These parts are currently active in production and carry AEC-Q101 automotive qualification, providing enhanced reliability documentation. The primary difference from the DL4151-TP is an increased reverse recovery time (8 ns versus 2 ns) and higher reverse leakage current (5 µA @ 75 V versus 50 nA @ 50 V), which remain acceptable for general-purpose rectification applications. Both variants are available in high inventory quantities (147,400 and 9,800 units respectively).

CDSL4148-G from Comchip Technology provides an alternative parametric equivalent with identical voltage and current ratings in the same package. This part exhibits a reverse recovery time of 4 ns and reverse leakage current of 2.5 µA @ 75 V, positioning it between the DL4151-TP and the Vishay variants in performance characteristics. CDSL4148-G is currently obsolete but maintains substantial inventory (161,660 units).

Secondary Substitutes (Functional Alternatives)

PMLL4153,115 from Nexperia USA Inc. operates at a reduced voltage rating (50 V maximum) compared to the DL4151-TP (75 V). This part is suitable only for applications where the circuit voltage does not exceed 50 V. The part offers a higher current rating (200 mA) and superior forward voltage characteristics (880 mV @ 50 mA). It maintains the same package form factor and is currently active in production.

1N4448W-TP from Micro Commercial Co differs significantly in package form factor (SOD-123 versus DO-213AC/MINI-MELF/SOD-80) and speed classification (Fast Recovery versus Small Signal). This part supports a higher current rating (250 mA) and is classified as active. The SOD-123 package requires different PCB layout and assembly considerations. This substitute is appropriate only when package flexibility exists in the design.

Compliance and Availability

All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices. All parts carry EAR99 export classification and are unaffected by REACH regulations.

Frequently Asked Questions (FAQ)

Q: Can LS4148-GS08 or LS4148-GS18 be used as direct replacements for DL4151-TP?

A: Yes. Both Vishay parts maintain identical voltage (75 V), current (150 mA), and package specifications (DO-213AC, MINI-MELF, SOD-80). The increased reverse recovery time (8 ns versus 2 ns) and higher reverse leakage current (5 µA @ 75 V versus 50 nA @ 50 V) are acceptable for general-purpose rectification circuits. Both parts are currently active in production with AEC-Q101 automotive qualification.

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

A: Both parts are electrically and mechanically identical. The designation difference reflects packaging variants: LS4148-GS08 is supplied in Cut Tape (CT) & Digi-Reel format with 147,400 units in stock, while LS4148-GS18 is also supplied in Cut Tape (CT) & Digi-Reel format with 9,800 units in stock. Selection between these variants depends on procurement volume and packaging requirements.

Q: Why is PMLL4153,115 listed as a substitute if it has a lower voltage rating?

A: PMLL4153,115 is a functional alternative suitable only for applications where the maximum circuit voltage does not exceed 50 V. It offers advantages in current rating (200 mA versus 150 mA) and forward voltage characteristics (880 mV @ 50 mA). This part is not a direct replacement for circuits requiring the full 75 V rating of the DL4151-TP.

Q: Can 1N4448W-TP replace DL4151-TP in the same PCB layout?

A: No. The 1N4448W-TP uses a SOD-123 package, which has a different footprint than the DO-213AC/MINI-MELF/SOD-80 package of the DL4151-TP. PCB layout modifications are required. Additionally, the 1N4448W-TP is classified as Fast Recovery (≤ 500ns, > 200mA), whereas the DL4151-TP is Small Signal (≤ 200mA, Any Speed). This substitute is appropriate only when design flexibility permits package and speed classification changes.

Q: What is the significance of the reverse recovery time difference between DL4151-TP and its substitutes?

A: Reverse recovery time (trr) affects switching speed and switching losses. The DL4151-TP has a trr of 2 ns, while most substitutes have trr values of 4 ns to 8 ns. For general-purpose rectification applications operating at low to moderate frequencies, these differences are not critical. For high-frequency switching applications, the faster recovery time of the DL4151-TP may provide advantages, but the substitutes remain functional within their specified operating parameters.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (LS4148-GS08, LS4148-GS18, CDSL4148-G, 1N4448W-TP, and PMLL4153,115) are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing processes and environmental regulations.

Q: What is the advantage of selecting an active product status substitute over an obsolete substitute?

A: Active products (LS4148-GS08, LS4148-GS18, 1N4448W-TP, PMLL4153,115) are currently manufactured and available for long-term procurement, ensuring supply chain continuity. Obsolete products (CDSL4148-G) rely on existing inventory and may become unavailable. For new designs or long-term production requirements, active substitutes provide superior supply assurance.

Q: Does CDSL4148-G offer any performance advantage over the Vishay alternatives?

A: CDSL4148-G exhibits a reverse recovery time of 4 ns, which is faster than the Vishay variants (8 ns) but slower than the original DL4151-TP (2 ns). The reverse leakage current of CDSL4148-G (2.5 µA @ 75 V) is lower than the Vishay variants (5 µA @ 75 V) but higher than the DL4151-TP (50 nA @ 50 V). CDSL4148-G provides a middle-ground performance profile, though its obsolete status limits long-term availability.

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