1N4946-AP Equivalent & Substitute Parts

Part Overview

The 1N4946-AP is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A
Reverse Recovery Time (trr)	250 ns
Current - Reverse Leakage @ Vr	5 µA @ 600 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 1N4946-AP are classified based on electrical parameter equivalence and mechanical compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

Secondary Parameters Affecting Substitution:

Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 1 A or lower
Reverse Recovery Time (trr): 250 ns or faster
Current - Reverse Leakage @ Vr: 5 µA @ 600 V or lower
Operating Temperature - Junction: -55°C ~ 150°C

Parts are grouped into two categories:

Direct Manufacturer Equivalent: 1N4946GP-AP maintains identical electrical specifications and is manufactured by the same supplier (Micro Commercial Co) with active product status.

Parametric Equivalents: FR105GP-AP, SF18G-AP, FR105A-G, and FR105G A0G meet or exceed the critical electrical parameters and mechanical requirements. These parts are sourced from alternative manufacturers (Micro Commercial Co, Comchip Technology, Taiwan Semiconductor Corporation) and carry active product status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Inventory
1N4946-AP	Micro Commercial Co	Obsolete	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	DO-41	985 Pcs
1N4946GP-AP	Micro Commercial Co	Active	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	DO-41	1073 Pcs
1N4937GP-AP	Micro Commercial Co	Active	600 V	1 A	1.2 V @ 1 A	200 ns	5 µA @ 600 V	DO-41	685 Pcs
FR105GP-AP	Micro Commercial Co	Active	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	DO-41	850 Pcs
SF18G-AP	Micro Commercial Co	Active	600 V	1 A	1.3 V @ 1 A	35 ns	5 µA @ 600 V	DO-41	863 Pcs
FR105A-G	Comchip Technology	Active	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	DO-41	999 Pcs
FR105G A0G	Taiwan Semiconductor Corporation	Active	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	DO-204AL (DO-41)	5309 Pcs

Engineering Selection Recommendations

Primary Substitute (Direct Equivalent): 1N4946GP-AP is the recommended primary substitute. This part is manufactured by Micro Commercial Co with identical electrical specifications to the obsolete 1N4946-AP. The part carries active product status and ROHS3 compliance. Inventory availability is 1073 pieces.

Secondary Substitutes (Parametric Equivalents):

1N4937GP-AP offers improved performance characteristics with lower forward voltage (1.2 V vs. 1.3 V) and faster reverse recovery time (200 ns vs. 250 ns). This part is suitable for applications where reduced switching losses are beneficial. Active product status and ROHS3 compliance are confirmed.

FR105GP-AP, FR105A-G, and FR105G A0G maintain electrical equivalence to the original specification. FR105G A0G, manufactured by Taiwan Semiconductor Corporation, offers the highest inventory availability (5309 pieces) and is supplied in cut tape packaging. All three parts carry active product status and ROHS3 compliance.

SF18G-AP provides the fastest reverse recovery time (35 ns) among available substitutes, making it suitable for high-frequency switching applications. This part maintains all other electrical parameters and carries active product status with ROHS3 compliance.

All substitute parts are RoHS3 compliant, carry Moisture Sensitivity Level 1 (Unlimited), and operate across the same temperature range (-55°C ~ 150°C) as the original component.

Frequently Asked Questions (FAQ)

Q: Can 1N4946GP-AP be used as a direct replacement for 1N4946-AP?

A: Yes. 1N4946GP-AP is electrically and mechanically identical to 1N4946-AP. Both parts share the same voltage rating (600 V), current rating (1 A), forward voltage (1.3 V @ 1 A), reverse recovery time (250 ns), and DO-41 package configuration. The primary difference is product status: 1N4946GP-AP is active while 1N4946-AP is obsolete.

Q: What is the difference between 1N4946GP-AP and 1N4937GP-AP?

A: Both parts meet the 600 V, 1 A specification and share the same package. 1N4937GP-AP offers improved performance with lower forward voltage (1.2 V vs. 1.3 V @ 1 A) and faster reverse recovery time (200 ns vs. 250 ns). Selection depends on whether the application benefits from reduced switching losses and faster recovery characteristics.

Q: Are FR105 series diodes compatible with the 1N4946-AP?

A: Yes. FR105GP-AP, FR105A-G, and FR105G A0G are parametric equivalents meeting the 600 V, 1 A specification. All three maintain the same forward voltage (1.3 V @ 1 A), reverse recovery time (250 ns), and through-hole DO-41 package configuration. FR105G A0G is supplied in cut tape packaging rather than standard bulk packaging.

Q: Why does SF18G-AP have a different reverse recovery time?

A: SF18G-AP is specified with a reverse recovery time of 35 ns, significantly faster than the original 1N4946-AP (250 ns). This faster recovery characteristic is an inherent design feature of the SF18G-AP diode. The part remains electrically equivalent for voltage and current ratings and is suitable for applications where faster switching is required or beneficial.

Q: What packaging options are available for substitutes?

A: Most substitute parts (1N4946GP-AP, 1N4937GP-AP, FR105GP-AP, SF18G-AP, FR105A-G) are supplied in standard through-hole DO-41 packaging. FR105G A0G is supplied in cut tape (CT) packaging with DO-204AL (DO-41) designation. All parts use the same axial lead configuration and are compatible with standard through-hole PCB layouts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (1N4946GP-AP, 1N4937GP-AP, FR105GP-AP, SF18G-AP, FR105A-G, FR105G A0G) carry ROHS3 compliance certification. All parts also carry Moisture Sensitivity Level 1 (Unlimited) and operate across the temperature range -55°C ~ 150°C.

Q: Which substitute offers the best inventory availability?

A: FR105G A0G, manufactured by Taiwan Semiconductor Corporation, offers the highest inventory availability with 5309 pieces in stock. This part maintains full electrical equivalence to the original specification and is supplied in cut tape packaging.

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