1N4944GP-AP Equivalent & Substitute Parts

Part Overview

The 1N4944GP-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This component is classified as Active and complies with ROHS3 and REACH standards. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications required for general-purpose rectification applications in the 400 V, 1 A operating range.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	—
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55°C ~ 150°C	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4944GP-AP are classified into two categories based on electrical parameter alignment:

Parametric Equivalents match the primary electrical specifications: 400 V DC reverse voltage, 1 A average rectified current, 1.3 V forward voltage drop at 1 A, fast recovery characteristics, and through-hole mounting. These parts are functionally interchangeable in applications where the 1 A current rating is the design requirement.

Higher-Current Substitutes exceed the current rating while maintaining the 400 V voltage specification. These parts are suitable for applications where the 1 A rating provides design margin or where future current requirements may increase, provided the circuit topology and thermal management accommodate the higher current capability.

The following key parameters determine substitution validity:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.3 V at the respective current rating
Speed Classification: Must meet Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Must be Through Hole
Package / Case: Must support DO-41 or DO-204AL form factor
RoHS Status: Must be ROHS3 Compliant

Parameter Comparison

Parameter	1N4944GP-AP (Main)	FR104G A0G	MUR240RLG	UF4005-G
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	onsemi	Comchip Technology
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	2 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 2 A	1.3 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	150 ns	150 ns	65 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Supplier Device Package	DO-41	DO-204AL (DO-41)	Axial	DO-41
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Obsolete

Engineering Selection Recommendations

FR104G A0G (Taiwan Semiconductor Corporation) is a parametric equivalent offering identical electrical specifications to the 1N4944GP-AP. Both parts are rated for 400 V, 1 A, with matching forward voltage and reverse recovery characteristics. The FR104G A0G is Active status and ROHS3 compliant. This part is suitable for direct substitution in applications requiring the 1 A rating.

MUR240RLG (onsemi) is a higher-current substitute rated for 400 V, 2 A. The reverse recovery time is superior at 65 ns compared to 150 ns for the main part. This part operates across an extended temperature range (-65°C to 175°C) and is Active status with ROHS3 compliance. Selection of this part is appropriate when circuit design permits the higher current rating or when improved switching performance is beneficial.

UF4005-G (Comchip Technology) is a parametric equivalent with 400 V, 1 A specifications matching the main part. However, this part is classified as Obsolete and should not be selected for new designs or long-term production applications. The reverse recovery time of 50 ns is superior to the main part, but the obsolete status precludes its use in active component selection.

For new designs and ongoing production, FR104G A0G or MUR240RLG are the recommended selections based on Active product status and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can FR104G A0G be used as a direct replacement for 1N4944GP-AP?

A: Yes. The FR104G A0G meets all electrical and mechanical requirements for direct substitution. Both parts are rated for 400 V, 1 A, with identical forward voltage characteristics, fast recovery speed classification, and through-hole mounting. Both are Active status and ROHS3 compliant.

Q: What is the difference between the 1 A and 2 A rated parts?

A: The MUR240RLG is rated for 2 A average rectified current compared to 1 A for the 1N4944GP-AP. The 2 A rating provides higher current capacity. Both maintain the same 400 V voltage rating and 1.3 V forward voltage specification at their respective current levels. Selection depends on circuit current requirements and thermal design considerations.

Q: Does the reverse recovery time difference affect circuit performance?

A: Reverse recovery time (trr) affects switching speed and switching losses in rectifier applications. The 1N4944GP-AP has trr of 150 ns. The MUR240RLG offers 65 ns, and the UF4005-G offers 50 ns. Faster recovery reduces switching losses and improves efficiency in high-frequency applications. However, the main part's 150 ns recovery time is within the Fast Recovery classification (≤ 500ns) and is suitable for standard rectification applications.

Q: Why is UF4005-G listed if it is Obsolete?

A: The UF4005-G is included in the parameter comparison for historical reference and to document available alternatives. However, its Obsolete status means it should not be selected for new designs or production applications. Active alternatives such as FR104G A0G or MUR240RLG are the appropriate choices.

Q: Are there package compatibility considerations between DO-41 and DO-204AL?

A: Both the 1N4944GP-AP and substitute parts support DO-204AL and DO-41 package designations. These are equivalent axial through-hole packages. The supplier device package may vary (DO-41 versus DO-204AL (DO-41)), but both are mechanically and electrically compatible for through-hole PCB mounting applications.

Q: What compliance certifications apply to all substitute parts?

A: All Active substitute parts (FR104G A0G and MUR240RLG) are ROHS3 compliant and REACH unaffected, matching the compliance profile of the 1N4944GP-AP. These certifications ensure suitability for regulated applications and environmental compliance requirements.

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