HER105-TP Equivalent & Substitute Parts

Part Overview

The HER105-TP 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 DO-41 through-hole axial package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a junction temperature range of -55°C to 125°C and complies with RoHS3 standards.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	50 ns
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the HER105-TP is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 400 V
Current - Average Rectified (Io) rating must equal or exceed 1 A
Speed classification must be Fast Recovery (≤ 500ns, > 200mA)
Mounting type must be Through Hole
Package compatibility must support DO-41 or equivalent axial configuration
RoHS3 compliance required

Substitute Parts Identified:

RGP10G (Fairchild Semiconductor) – Direct equivalent with identical voltage and current ratings, same DO-41 package, active product status
MUR240RLG (onsemi) – Higher current rating (2 A) with same voltage rating, compatible axial package, active product status with extended temperature range

Parameter Comparison

Parameter	HER105-TP	RGP10G	MUR240RLG
Manufacturer	Micro Commercial Co	Fairchild Semiconductor	onsemi
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.3 V @ 1 A	1.3 V @ 2 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	50 ns	150 ns	65 ns
Current - Reverse Leakage @ Vr	5 mA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 175°C	-65°C ~ 175°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

RGP10G (Fairchild Semiconductor) is the primary equivalent substitute for HER105-TP applications. This part maintains identical voltage and current ratings (400 V, 1 A), uses the same DO-41 package, and is currently in active production status. The RGP10G provides extended operating temperature range (-65°C to 175°C) compared to the original part. Forward voltage is slightly elevated at 1.3 V versus 1.1 V, and reverse recovery time is longer at 150 ns versus 50 ns. Reverse leakage current is significantly lower at 5 µA compared to 5 mA. This part is suitable for direct replacement in existing designs.

MUR240RLG (onsemi) serves as a higher-capacity substitute when circuit design permits increased current handling. This part doubles the current rating to 2 A while maintaining the 400 V voltage specification. The MUR240RLG is part of the SWITCHMODE™ series and offers active product status with ROHS3 compliance. The extended temperature range (-65°C to 175°C) and lower reverse leakage current (5 µA) provide performance advantages. The reverse recovery time of 65 ns falls between the original part and the RGP10G. This substitute is appropriate for applications requiring higher current capacity or improved thermal performance.

Both substitute parts are currently in active production with established supply chains, addressing the obsolescence status of the HER105-TP.

Frequently Asked Questions (FAQ)

Q: Can RGP10G be used as a direct replacement for HER105-TP?

A: Yes. The RGP10G maintains the same 400 V reverse voltage rating, 1 A current rating, and DO-41 through-hole axial package configuration. Both parts are classified as fast recovery diodes. The RGP10G is currently in active production, whereas the HER105-TP is obsolete.

Q: What are the differences between RGP10G and MUR240RLG?

A: The primary difference is current rating: RGP10G is rated for 1 A, while MUR240RLG is rated for 2 A. Both maintain 400 V reverse voltage. The MUR240RLG has a lower reverse recovery time (65 ns versus 150 ns) and significantly lower reverse leakage current (5 µA versus 5 µA at rated voltage). The MUR240RLG is part of the onsemi SWITCHMODE™ series and offers extended temperature range.

Q: Is the MUR240RLG suitable for circuits designed for 1 A operation?

A: Yes. The MUR240RLG is rated for 2 A average rectified current, making it suitable for applications requiring 1 A or less. The higher current rating provides design margin and does not create compatibility issues in lower-current applications.

Q: Are both substitute parts RoHS3 compliant?

A: The MUR240RLG is explicitly ROHS3 compliant. The RGP10G RoHS status is not specified in available documentation. The original HER105-TP is ROHS3 compliant.

Q: What is the impact of forward voltage differences between these parts?

A: The HER105-TP specifies 1.1 V forward voltage at 1 A, while both RGP10G and MUR240RLG specify 1.3 V at their respective rated currents. This 0.2 V difference results in slightly increased power dissipation in the substitute parts. For 1 A operation, the additional dissipation is approximately 0.2 W per diode.

Q: Can these parts be used in high-temperature applications?

A: Both substitute parts support extended operating temperature ranges (-65°C to 175°C) compared to the original HER105-TP (-55°C to 125°C). This provides additional design flexibility for applications requiring operation at elevated temperatures.

Q: Are there package considerations when substituting these parts?

A: All three parts use DO-41 through-hole axial packages and are mechanically compatible. No PCB layout modifications are required for substitution.

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