DL4150-TP Equivalent & Substitute Parts

Part Overview

The DL4150-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 200 mA average rectified current in a Surface Mount Mini MELF package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for the same application categories.

Key Parameters

Parameter	Value	Specification
Voltage - DC Reverse (Vr) (Max)	50 V	Maximum reverse voltage rating
Current - Average Rectified (Io)	200 mA	Maximum average forward current
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	Forward voltage drop at rated current
Reverse Recovery Time (trr)	6 ns	Small signal switching characteristic
Current - Reverse Leakage @ Vr	100 nA @ 50 V	Leakage current at maximum reverse voltage
Capacitance @ Vr, F	2.5 pF @ 0 V, 1 MHz	Junction capacitance
Package / Case	DO-213AC, MINI-MELF, SOD-80	Surface mount package designation
Operating Temperature - Junction (Max)	175°C	Maximum junction temperature
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Moisture handling classification

Substitute Part Grouping Explanation

Substitute parts for the DL4150-TP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (FDLL4150): This part maintains identical electrical specifications across all critical parameters: 50 V reverse voltage, 200 mA average rectified current, 1 V forward voltage drop at 200 mA, 6 ns reverse recovery time, 100 nA reverse leakage current, and 2.5 pF capacitance. The package designation remains DO-213AC/MINI-MELF/SOD-80. This classification indicates direct functional interchangeability with no circuit redesign required.

Functional Substitute (1N4448W-TP): This part provides enhanced electrical ratings suitable for applications requiring higher voltage or current margins. The 1N4448W-TP offers 75 V reverse voltage (versus 50 V) and 250 mA average rectified current (versus 200 mA), representing a 50% increase in both parameters. The package changes from Mini MELF to SOD-123, requiring PCB layout modification. The reverse recovery time improves to 4 ns, and reverse leakage increases to 2.5 µA at 75 V. This substitution is valid for circuits where the higher ratings do not create design conflicts and where PCB footprint accommodation is feasible.

Substitution validity is determined by the following criteria:

Reverse voltage rating must equal or exceed circuit requirements
Average rectified current capacity must equal or exceed circuit requirements
Forward voltage drop must be compatible with circuit bias conditions
Package footprint must be accommodated on the PCB
Operating temperature range must encompass application environment
Compliance certifications must satisfy regulatory requirements

Parameter Comparison

Parameter	DL4150-TP (Main)	FDLL4150 (Parametric Equivalent)	1N4448W-TP (Functional Substitute)
Manufacturer	Micro Commercial Co	onsemi	Micro Commercial Co
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	75 V
Current - Average Rectified (Io)	200 mA	200 mA	250 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	1 V @ 200 mA	1 V @ 100 mA
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed	Small Signal ≤ 200 mA (Io), Any Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	6 ns	6 ns	4 ns
Current - Reverse Leakage @ Vr	100 nA @ 50 V	100 nA @ 50 V	2.5 µA @ 75 V
Capacitance @ Vr, F	2.5 pF @ 0 V, 1 MHz	2.5 pF @ 0 V, 1 MHz	4 pF @ 4 V, 1 MHz
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	SOD-123
Operating Temperature - Junction	175°C (Max)	175°C (Max)	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

FDLL4150 Selection: The FDLL4150 is the primary equivalent for DL4150-TP replacement. This part maintains all electrical specifications identically and shares the same package designation. The FDLL4150 is manufactured by onsemi and carries active product status with substantial inventory availability (269,762 pieces). Both parts are ROHS3 compliant, REACH unaffected, and classified as MSL 1. The maximum junction temperature rating of 175°C matches the original specification. Selection of FDLL4150 requires no circuit modification and no PCB layout changes, providing direct drop-in compatibility.

1N4448W-TP Selection: The 1N4448W-TP is a functional substitute applicable when circuit design permits higher voltage and current ratings. This part is suitable for applications where the DL4150-TP's 50 V / 200 mA ratings represent conservative margins and where 75 V / 250 mA ratings provide beneficial design headroom. The 1N4448W-TP exhibits improved reverse recovery time (4 ns versus 6 ns) and faster switching characteristics, making it suitable for higher-frequency applications. However, the maximum junction temperature is limited to 150°C, which is 25°C lower than the original specification. The SOD-123 package requires PCB footprint redesign. Selection of 1N4448W-TP is valid only when circuit requirements and thermal environment accommodate these parameter differences.

Both substitute parts satisfy regulatory compliance requirements and moisture sensitivity classifications identical to the original part.

Frequently Asked Questions (FAQ)

Q: Can FDLL4150 replace DL4150-TP without circuit modification?

A: Yes. The FDLL4150 maintains identical electrical specifications (50 V reverse voltage, 200 mA average rectified current, 1 V forward voltage drop, 6 ns reverse recovery time, 100 nA reverse leakage, 2.5 pF capacitance) and identical package designation (DO-213AC/MINI-MELF/SOD-80). No circuit redesign or PCB layout modification is required.

Q: What are the key differences between FDLL4150 and 1N4448W-TP?

A: The FDLL4150 is a parametric equivalent maintaining all DL4150-TP specifications. The 1N4448W-TP is a functional substitute with enhanced ratings: 75 V reverse voltage (versus 50 V), 250 mA average rectified current (versus 200 mA), improved reverse recovery time of 4 ns (versus 6 ns), and a different package (SOD-123 versus Mini MELF). The 1N4448W-TP maximum junction temperature is 150°C, which is 25°C lower than the original specification.

Q: When should 1N4448W-TP be selected over FDLL4150?

A: The 1N4448W-TP is selected when circuit design requires higher voltage or current margins beyond the 50 V / 200 mA ratings, when faster switching characteristics (4 ns trr) are beneficial, and when the PCB layout can accommodate the SOD-123 package footprint. The 1N4448W-TP is not suitable for applications requiring junction temperatures above 150°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both FDLL4150 and 1N4448W-TP are ROHS3 compliant and REACH unaffected, matching the compliance status of the original DL4150-TP.

Q: What is the moisture sensitivity classification for these parts?

A: All three parts (DL4150-TP, FDLL4150, and 1N4448W-TP) are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Does package change from Mini MELF to SOD-123 affect circuit performance?

A: Package change affects PCB layout and assembly process but does not alter electrical circuit performance. The SOD-123 package has different physical dimensions and lead configuration compared to Mini MELF, requiring PCB footprint redesign and potential assembly process adjustments. Electrical performance remains determined by the diode's internal specifications.

Q: What is the inventory status of substitute parts?

A: FDLL4150 has 269,762 pieces in stock. 1N4448W-TP has 12,865 pieces in stock. Both parts are actively manufactured and available for procurement.

Q: Can reverse leakage current differences affect circuit operation?

A: The FDLL4150 maintains identical reverse leakage (100 nA @ 50 V) as the original DL4150-TP. The 1N4448W-TP exhibits higher reverse leakage (2.5 µA @ 75 V), which is 25 times greater. In high-impedance circuits or precision analog applications, this difference may require circuit analysis to confirm acceptable performance.

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