1N4448-TP Equivalent & Substitute Parts

Part Overview

The 1N4448-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 DO-35 through-hole package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design and procurement requirements. Substitute parts must maintain functional compatibility within the electrical and mechanical constraints of the original specification while considering current product availability and compliance status.

Key Parameters

Parameter	1N4448-TP 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	µA
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction	-50°C ~ 150°C	°C
Technology	Standard	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution of the 1N4448-TP is determined by the following critical parameters:

Voltage Rating Compatibility: Substitute parts must have a DC reverse voltage rating (Vr) equal to or greater than 75 V to ensure safe operation within the original circuit voltage envelope.

Current Rating Compatibility: Substitute parts must have an average rectified current (Io) rating equal to or greater than 150 mA to support the original circuit current requirements.

Package Compatibility: All substitute parts must use the DO-35 (DO-204AH) through-hole axial package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Speed Classification: All substitute parts must maintain the small signal diode classification (≤ 200 mA) with standard switching characteristics to preserve circuit timing and performance.

Forward Voltage Characteristics: Substitute parts must maintain forward voltage (Vf) specifications compatible with the original design point to ensure proper circuit operation.

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents: Parts with voltage and current ratings matching or exceeding the 1N4448-TP specification (75 V, 150 mA minimum) while maintaining identical package and speed classification.

Category B - Enhanced Rating Substitutes: Parts with higher voltage ratings (100 V) or higher current ratings (200 mA) that provide design margin while maintaining backward compatibility with the original circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
1N4448-TP	Micro Commercial Co	75	150	1 @ 100 mA	4	5 @ 75 V	DO-35	-50 ~ 150	Obsolete
1N4148	Taiwan Semiconductor Corporation	100	150	1 @ 10 mA	4	5 @ 75 V	DO-35	-65 ~ 150	Active
1N4148-T26A	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	DO-35	-55 ~ 175	Active
1N4148-T50A	Fairchild Semiconductor	100	200	1 @ 10 mA	4	5 @ 75 V	DO-35	—	Active
1N4148-T50R	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	DO-35	-55 ~ 175	Active
1N4148TA	Fairchild Semiconductor	100	200	1 @ 10 mA	4	5 @ 75 V	DO-35	—	Active
1N4148TR	Fairchild Semiconductor	100	200	1 @ 10 mA	4	5 @ 75 V	DO-35	-65 ~ 175	Active
1N4448	Microchip Technology	75	200	1 @ 100 mA	4	25 nA @ 20 V	DO-35	-65 ~ 150	Discontinued at DiGi Electronics
1N4448TR	Vishay General Semiconductor - Diodes Division	100	150	1 @ 100 mA	8	5 @ 75 V	DO-35	—	Active
1N914	Good-Ark Semiconductor	100	75	1 @ 10 mA	4	5 @ 75 V	DO-35	—	Active

Engineering Selection Recommendations

Primary Substitute - 1N4148 (Taiwan Semiconductor Corporation):

The 1N4148 is an active product with 100 V reverse voltage rating and 150 mA current rating, meeting or exceeding all electrical requirements of the 1N4448-TP. This part maintains identical package geometry (DO-35), identical reverse recovery time (4 ns), and identical reverse leakage current specification (5 µA @ 75 V). The extended operating temperature range (-65°C ~ 150°C) provides additional thermal margin. ROHS3 compliance and REACH unaffected status align with modern regulatory requirements. High inventory availability (212,500 pcs) ensures supply continuity.

Secondary Substitute - 1N4148-T50R (onsemi):

The 1N4148-T50R provides 100 V reverse voltage and 200 mA current rating with identical electrical characteristics to the 1N4148. Cut tape packaging offers flexibility for automated assembly. ROHS3 compliance and REACH unaffected status are confirmed. Operating temperature range (-55°C ~ 175°C) exceeds the original specification. Inventory availability (39,503 pcs) supports procurement requirements.

Secondary Substitute - 1N4148-T26A (onsemi):

The 1N4148-T26A offers 100 V reverse voltage and 200 mA current rating with 4 ns reverse recovery time. Extended operating temperature range (-55°C ~ 175°C) and higher current capacity provide design margin. ROHS3 compliance confirmed. Inventory availability (248,250 pcs) is substantial.

Secondary Substitute - 1N4148TR (Fairchild Semiconductor):

The 1N4148TR provides 100 V reverse voltage and 200 mA current rating with identical switching characteristics (4 ns trr). Extended operating temperature range (-65°C ~ 175°C) and ROHS3 compliance are confirmed. Inventory availability (240,400 pcs) supports production requirements.

Alternative Substitute - 1N4448TR (Vishay General Semiconductor - Diodes Division):

The 1N4448TR maintains the original 75 V voltage rating and 150 mA current rating with identical forward voltage characteristics (1 V @ 100 mA). This part provides the closest electrical match to the 1N4448-TP. However, reverse recovery time is specified at 8 ns (versus 4 ns for the original), which may affect circuit timing in applications sensitive to switching speed. ROHS3 compliance and REACH unaffected status are confirmed. Active product status with inventory availability (19,900 pcs) supports procurement.

Not Recommended - 1N914 (Good-Ark Semiconductor):

The 1N914 has a maximum average rectified current rating of 75 mA, which is insufficient for the 150 mA requirement of the 1N4448-TP. This part does not meet the minimum current specification and is not suitable as a direct substitute.

Not Recommended - 1N4448 (Microchip Technology):

The 1N4448 is discontinued at DiGi Electronics and carries RoHS non-compliant status, making it unsuitable for new designs or procurement.

Frequently Asked Questions (FAQ)

Q: Can the 1N4148 directly replace the 1N4448-TP in my circuit?

A: Yes. The 1N4148 meets all critical electrical parameters: 100 V reverse voltage (exceeds 75 V requirement), 150 mA current rating (meets requirement), 4 ns reverse recovery time (identical), and DO-35 package (identical). The higher voltage rating provides additional design margin without affecting circuit operation.

Q: What is the difference between 1N4148 and 1N4148-T50R?

A: Both parts have identical electrical specifications (100 V, 150 mA, 4 ns trr). The primary difference is packaging: 1N4148-T50R is supplied in cut tape format, while standard 1N4148 may be supplied in bulk or tape. Both are suitable substitutes for the 1N4448-TP.

Q: Why does the 1N4148-T26A have a higher current rating (200 mA) than the 1N4448-TP (150 mA)?

A: The 1N4148-T26A is rated for higher average rectified current, providing additional design margin and thermal headroom. This higher rating does not affect compatibility; the part operates safely at the lower 150 mA requirement of the original circuit.

Q: Is the 1N4448TR a suitable substitute?

A: The 1N4448TR is electrically compatible with the 1N4448-TP, maintaining the same 75 V voltage rating and 150 mA current rating. However, the reverse recovery time is 8 ns compared to 4 ns for the original part. In circuits where switching speed is critical, this difference may affect performance. Verify circuit timing requirements before selection.

Q: Can I use the 1N914 as a substitute?

A: No. The 1N914 is rated for only 75 mA average rectified current, which is insufficient for the 150 mA requirement of the 1N4448-TP. Using this part would result in component overstress and potential circuit failure.

Q: What compliance certifications should I verify for new designs?

A: All recommended substitutes (1N4148, 1N4148-T50R, 1N4148-T26A, 1N4148TR) carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic components in most jurisdictions.

Q: Does package format affect electrical performance?

A: No. The DO-35 package format is standardized across all recommended substitutes. Differences in supply format (bulk, cut tape, tape and reel) affect procurement and assembly processes but not electrical performance or circuit compatibility.

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

A: Active products have confirmed ongoing manufacturing, established supply chains, and long-term availability. Obsolete parts face supply discontinuation risk, potential quality degradation, and higher procurement costs. Active substitutes ensure design longevity and production continuity.

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