DL4448-TP Equivalent & Substitute Parts

Part Overview

The DL4448-TP is a general-purpose surface mount rectifier diode manufactured by Micro Commercial Co, rated for 75 V DC reverse voltage and 150 mA average rectified current. The device is packaged in a Mini MELF (DO-213AC, SOD-80) form factor and features a maximum forward voltage of 1 V at 100 mA with a reverse recovery time of 4 ns.

The DL4448-TP is classified as obsolete. Substitute components are necessary to maintain design continuity and ensure continued availability for production and repair applications. Equivalent and substitute parts listed herein maintain electrical compatibility within specified parameter ranges while offering active product status and improved availability.

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 @ 100 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5	µA @ 75 V
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Operating Temperature - Junction (Max)	200	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DL4448-TP is determined by the following critical electrical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 75 V
Current - Average Rectified (Io): Must equal or exceed 150 mA
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1 V @ 100 mA
Reverse Recovery Time (trr): Must equal 4 ns
Mounting Type: Surface Mount
Package / Case: DO-213AC, MINI-MELF, SOD-80 or compatible surface mount package

Secondary Compatibility Factors:

Operating Temperature - Junction: Must support 200°C maximum
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are grouped into two categories:

Category A - Direct Mini MELF Package Equivalents: Parts maintaining the DO-213AC, MINI-MELF, SOD-80 package form factor with electrical parameters meeting or exceeding the DL4448-TP specification.

Category B - Alternative Package Equivalents: Parts with equivalent electrical performance but in alternative surface mount packages (SOD-123, LLDS) that provide functional substitution with package footprint differences.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	trr [ns]	Package	Status
DL4448-TP	Micro Commercial Co	75	150	1 @ 100 mA	4	DO-213AC, MINI-MELF, SOD-80	Obsolete
BAS32L,115	NXP Semiconductors	75	200	1 @ 100 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
BAS32L,135	NXP Semiconductors	75	200	1 @ 100 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
FDLL4448	onsemi	100	200	1 @ 100 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
PMLL4148L,115	Nexperia USA Inc.	75	200	1 @ 50 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
PMLL4148L,135	Nexperia USA Inc.	75	200	1 @ 50 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
PMLL4448,115	Nexperia USA Inc.	75	200	1 @ 100 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
PMLL4448,135	Nexperia USA Inc.	75	200	1 @ 100 mA	4	DO-213AC, MINI-MELF, SOD-80	Active
1N4448W-TP	Micro Commercial Co	75	250	1 @ 100 mA	4	SOD-123	Active

Engineering Selection Recommendations

Direct Substitutes (Mini MELF Package Maintained):

The following parts provide direct electrical and mechanical substitution for the DL4448-TP while maintaining the Mini MELF package form factor:

BAS32L,115 and BAS32L,135 (NXP Semiconductors): Both variants offer 75 V reverse voltage rating, 200 mA average rectified current, and identical forward voltage characteristics. Active product status with unlimited MSL rating. Available in high inventory quantities (87,800 and 636,212 units respectively).
PMLL4448,115 and PMLL4448,135 (Nexperia USA Inc.): Both variants match the DL4448-TP electrical specification with 75 V reverse voltage, 200 mA current rating, and 1 V forward voltage at 100 mA. Active status with ROHS3 compliance. Inventory availability: 51,808 and 1,328 units respectively.
FDLL4448 (onsemi): Provides enhanced reverse voltage rating of 100 V with 200 mA current capability. Maintains 4 ns reverse recovery time and Mini MELF package. Active status with extended operating temperature range (-55°C to 175°C). Inventory: 27,800 units.

Alternative Package Substitute:

1N4448W-TP (Micro Commercial Co): Offers 75 V reverse voltage and 250 mA average rectified current in SOD-123 package. Active product status from the same manufacturer as the original part. Suitable for applications where package footprint change is acceptable. Inventory: 12,865 units.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and equivalent reverse recovery time specifications. Selection should be based on package footprint requirements and current capacity margin needed for the application.

Frequently Asked Questions (FAQ)

Q: Can the DL4448-TP be replaced with a part rated for higher current capacity?

A: Yes. Substitute parts rated for 200 mA or 250 mA average rectified current are electrically compatible with the DL4448-TP, which requires only 150 mA. Higher current ratings provide design margin without affecting circuit operation at the original current level.

Q: What is the difference between BAS32L,115 and BAS32L,135?

A: Both parts are electrically identical with 75 V reverse voltage and 200 mA current rating. The difference is packaging: BAS32L,115 is supplied in Cut Tape format, while BAS32L,135 is supplied in Bulk packaging. Selection depends on procurement and assembly requirements.

Q: Is the FDLL4448 a suitable substitute despite its 100 V rating?

A: Yes. The FDLL4448 is rated for 100 V reverse voltage, which exceeds the DL4448-TP requirement of 75 V. This higher voltage rating does not create incompatibility; it provides additional design margin. All other electrical parameters match the original specification.

Q: Can the 1N4448W-TP be used as a direct replacement?

A: The 1N4448W-TP provides electrical equivalence with 75 V reverse voltage and superior current rating (250 mA). However, it uses SOD-123 package instead of Mini MELF. This substitution requires PCB layout modification and is suitable only when package footprint change is acceptable.

Q: What is the significance of the forward voltage test condition difference in PMLL4148L parts?

A: PMLL4148L,115 and PMLL4148L,135 specify forward voltage at 50 mA (1 V @ 50 mA) rather than 100 mA. This indicates the same maximum forward voltage specification but measured at a different current level. Both parts meet the DL4448-TP forward voltage requirement of 1 V @ 100 mA.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, consistent with the original DL4448-TP specification.

Q: What is the difference between Nexperia parts PMLL4448 and PMLL4148L?

A: Both are Nexperia general-purpose rectifier diodes in Mini MELF package with 75 V rating and 200 mA current capacity. PMLL4448 is the direct equivalent to the DL4448-TP base product number. PMLL4148L is an alternative series designation. Both are electrically compatible substitutes.

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