1N4148-TP Equivalent & Substitute Parts

Part Overview

The 1N4148-TP is a general-purpose switching 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, necessitating identification of equivalent alternatives for ongoing design and procurement requirements. Substitute parts must maintain functional compatibility across voltage, current, and thermal specifications while accommodating available product status and compliance certifications.

Key Parameters

Parameter	1N4148-TP Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	150	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 10 mA	V @ mA
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	µA @ V
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	pF @ V, MHz
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the 1N4148-TP is based on the following critical parameters:

Voltage Rating Compatibility: Substitute parts must have a DC reverse voltage rating equal to or greater than 75 V. Parts rated at 100 V provide additional margin and are acceptable for applications designed for 75 V operation.

Current Rating Compatibility: Substitute parts must support the 150 mA average rectified current requirement. Parts rated at 200 mA exceed this requirement and are functionally compatible.

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

Speed Classification: All candidates maintain small-signal switching characteristics with reverse recovery times of 4 ns or less, consistent with the original part's speed classification.

Thermal Range: Operating temperature ranges must encompass the application's operating environment. The original part specifies -65°C to 175°C; substitutes with equal or wider ranges are acceptable.

Compliance Status: RoHS3 compliance is preferred for new designs; however, RoHS non-compliant parts may be used where legacy compliance is not required.

Parameter Comparison

Parameter	1N4148-TP (Micro Commercial Co)	1N4448 (Microchip)	1N4148 (Taiwan Semiconductor)	1N4148-1 (Microchip)	1N4148-G (Comchip)	1N4148-T26A (onsemi)	1N4148-T50A (Fairchild)	1N4148-T50R (onsemi)	1N4148TA (Fairchild)	1N4148TR (Fairchild)	1N4153-1 (Microchip)
Vr (Max) [V]	75	75	100	75	75	100	100	100	100	100	50
Io [mA]	150	200	150	200	150	200	200	200	200	200	150
Vf (Max) @ If [V @ mA]	1 @ 10	1 @ 100	1 @ 10	1.2 @ 100	1 @ 10	1 @ 10	1 @ 10	1 @ 10	1 @ 10	1 @ 10	0.88 @ 20
trr [ns]	4	4	4	20	—	4	4	4	4	4	4
Ir @ Vr [µA @ V]	5 @ 75	25 nA @ 20	5 @ 75	500 nA @ 75	5 @ 75	5 @ 75	5 @ 75	5 @ 75	5 @ 75	5 @ 75	50 nA @ 50
Capacitance @ Vr, F [pF @ V, MHz]	4 @ 0, 1	—	4 @ 0, 1	—	—	4 @ 0, 1	4 @ 0, 1	4 @ 0, 1	4 @ 0, 1	4 @ 0, 1	—
Tj (Operating) [°C]	-65 to 175	-65 to 150	-65 to 150	-65 to 175	-65 to 200	-55 to 175	Max 175	-55 to 175	Max 175	-65 to 175	-65 to 175
Package	DO-35	DO-35	DO-35	DO-35	DO-35	DO-35	DO-35	DO-35	DO-35	DO-35	DO-35
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Active	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	—	ROHS3 Compliant	Non-compliant

Engineering Selection Recommendations

Primary Substitutes (Preferred):

The following parts are recommended as primary substitutes based on active product status, RoHS3 compliance, and electrical parameter compatibility:

1N4148-T50R (onsemi): Rated 100 V / 200 mA with 4 ns reverse recovery time, RoHS3 compliant, active product status. Exceeds voltage and current requirements with identical switching speed. Operating temperature range -55°C to 175°C accommodates most industrial applications.

1N4148TR (Fairchild Semiconductor): Rated 100 V / 200 mA with 4 ns reverse recovery time, RoHS3 compliant, active product status. Identical electrical specifications to 1N4148-T50R with extended temperature range -65°C to 175°C, matching the original part's lower temperature limit.

1N4148-T26A (onsemi): Rated 100 V / 200 mA with 4 ns reverse recovery time, RoHS3 compliant, active product status. Provides equivalent performance with operating temperature range -55°C to 175°C.

1N4148TA (Fairchild Semiconductor): Rated 100 V / 200 mA with 4 ns reverse recovery time, active product status. Provides high inventory availability (1,000,100 pcs) with identical electrical specifications.

Secondary Substitutes (Conditional):

1N4148 (Taiwan Semiconductor Corporation): Rated 100 V / 150 mA with 4 ns reverse recovery time, RoHS3 compliant, active product status. Matches the original part's current rating while providing higher voltage margin. Extensive inventory (212,500 pcs) supports long-term availability.

1N4148-1 (Microchip Technology): Rated 75 V / 200 mA, active product status. Maintains original voltage rating with increased current capacity. Reverse recovery time of 20 ns is acceptable for non-critical switching applications. RoHS non-compliant status requires compliance verification.

Not Recommended:

1N4153-1 (Microchip Technology): Rated 50 V maximum reverse voltage. Insufficient voltage rating for 75 V application requirements.

1N4448 (Microchip Technology): Discontinued at DiGi Electronics with RoHS non-compliant status. Limited long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use a 100 V rated diode in place of the 75 V 1N4148-TP?

A: Yes. A 100 V rated diode provides additional reverse voltage margin and is functionally compatible with applications designed for 75 V operation. All recommended primary substitutes are rated 100 V.

Q: What is the significance of the 4 ns reverse recovery time specification?

A: Reverse recovery time (trr) determines switching speed in high-frequency applications. The 1N4148-TP specifies 4 ns. Substitute parts with 4 ns trr maintain identical switching performance. Parts with longer trr values (such as 1N4148-1 at 20 ns) are acceptable only in applications where switching speed is not critical.

Q: Are RoHS3 compliant parts required for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. For legacy or non-regulated applications, RoHS non-compliant parts may be acceptable. Verify compliance requirements with your design and procurement standards.

Q: Does the DO-35 package differ between manufacturers?

A: No. The DO-35 package (DO-204AH) is a standardized through-hole axial package. All listed substitute parts use identical mechanical dimensions and pin configurations, ensuring direct PCB compatibility.

Q: What is the difference between bulk and cut tape packaging?

A: Bulk packaging contains loose components; cut tape (CT) packaging provides components on continuous tape for automated assembly. Both formats use identical electrical and mechanical specifications. Selection depends on assembly process requirements, not electrical performance.

Q: Can I substitute a 200 mA rated diode for a 150 mA application?

A: Yes. A 200 mA rated diode exceeds the 150 mA requirement and is functionally compatible. The higher current rating provides design margin without affecting circuit performance.

Q: What is the operating temperature range significance?

A: The operating temperature range specifies the junction temperature limits for reliable operation. The 1N4148-TP specifies -65°C to 175°C. Substitute parts with equal or wider ranges are acceptable. Parts with narrower ranges (such as -55°C to 175°C) are acceptable if your application does not require operation below -55°C.

Q: Why is the 1N4153-1 not recommended as a substitute?

A: The 1N4153-1 is rated for maximum 50 V reverse voltage, which is insufficient for the 75 V application requirement. Using an undersized voltage rating creates risk of diode failure under reverse bias conditions.

Q: What inventory considerations should I evaluate?

A: Inventory levels affect long-term availability and lead times. Parts with high inventory (such as 1N4148TA with 1,000,100 pcs) provide greater supply security. Obsolete or discontinued parts (such as 1N4148-TP and 1N4448) present procurement risk for future requirements.

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