HER104-TP Equivalent & Substitute Parts

Part Overview

The HER104-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 300 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. The HER104-TP features fast recovery characteristics with a reverse recovery time of 50 ns, suitable for standard rectification applications requiring moderate switching speeds.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	mA @ 300 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HER104-TP is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 300 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-204AL, DO-41, or Axial configuration
Mounting Type: Through Hole
Speed Classification: Fast Recovery (≤ 500ns, > 200mA)
Reverse Recovery Time (trr): 50 ns or faster

Direct Equivalent: The HER104G-TP from Micro Commercial Co is a direct equivalent, sharing identical electrical ratings and package specifications with improved product status (Active vs. Obsolete) and lower reverse leakage current (5 µA vs. 5 mA).

Similar Substitutes: Parts meeting or exceeding the primary criteria are classified as similar substitutes. These include the 1N5394-E3/54 (higher current rating of 1.5 A), EGP10F-E3/73 (fast recovery, extended temperature range), and SF15GHB0G (automotive-qualified, faster recovery time of 35 ns). All similar substitutes maintain the 300 V reverse voltage rating and through-hole DO-41 package configuration.

Parameter Comparison

Parameter	HER104-TP	HER104G-TP	1N5394-E3/54	EGP10F-E3/73	SF15GHB0G
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	300 V	300 V	300 V
Current - Average Rectified (Io)	1 A	1 A	1.5 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1 V @ 1 A	1.4 V @ 1.5 A	1.25 V @ 1 A	1.3 V @ 1 A
Reverse Recovery Time (trr)	50 ns	50 ns	2 µs	50 ns	35 ns
Current - Reverse Leakage @ Vr	5 mA @ 300 V	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Standard Recovery > 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55 to 125 °C	-55 to 125 °C	-50 to 150 °C	-65 to 150 °C	-55 to 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Preferred): The HER104G-TP is the recommended direct replacement for the obsolete HER104-TP. Both parts share identical electrical specifications and package configuration. The HER104G-TP offers the additional advantage of Active product status, ensuring long-term availability and supply chain continuity. The HER104G-TP also exhibits superior reverse leakage characteristics (5 µA vs. 5 mA), resulting in lower power dissipation in standby conditions.

Alternative Substitutes: The EGP10F-E3/73 from Vishay General Semiconductor provides equivalent electrical performance with extended operating temperature range (-65 to 150 °C vs. -55 to 125 °C) and maintains fast recovery characteristics. This part is suitable for applications requiring broader thermal operating margins.

The SF15GHB0G from Taiwan Semiconductor Corporation is qualified to AEC-Q101 automotive standards and features the fastest reverse recovery time (35 ns) among all listed substitutes. This part is appropriate for automotive and high-reliability applications.

The 1N5394-E3/54 from Vishay General Semiconductor provides higher current capacity (1.5 A vs. 1 A) and extended temperature range but operates with standard recovery speed (2 µs) rather than fast recovery. This part is suitable only for applications where switching speed is not a critical parameter and higher current margin is beneficial.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with standard manufacturing and storage practices. All parts carry EAR99 export classification and identical HTSUS commodity codes.

Frequently Asked Questions (FAQ)

Q: Can the HER104G-TP be used as a direct replacement for the HER104-TP?

A: Yes. The HER104G-TP is a direct equivalent with identical electrical ratings (300 V, 1 A), fast recovery characteristics (50 ns), and DO-41 package configuration. The HER104G-TP offers improved product status (Active) and lower reverse leakage current (5 µA vs. 5 mA).

Q: What is the difference between fast recovery and standard recovery diodes?

A: Fast recovery diodes have reverse recovery times of 500 ns or less, enabling operation at higher switching frequencies with reduced switching losses. Standard recovery diodes exceed 500 ns reverse recovery time and are suitable for lower-frequency applications. The HER104-TP and its direct equivalent HER104G-TP are fast recovery devices with 50 ns reverse recovery time.

Q: Can the 1N5394-E3/54 replace the HER104-TP?

A: The 1N5394-E3/54 meets the voltage and package requirements but operates with standard recovery speed (2 µs) rather than fast recovery (50 ns). Substitution is valid only for applications where switching frequency is low and recovery speed is not a limiting factor. The 1N5394-E3/54 provides higher current capacity (1.5 A), which may be beneficial for designs with marginal current margins.

Q: What are the packaging differences between these diodes?

A: All listed parts use through-hole mounting in DO-204AL (DO-41) axial package configuration. The HER104-TP is supplied in bulk packaging, while the HER104G-TP is available in Tape & Reel format. The 1N5394-E3/54 is supplied in Cut Tape format. Package format does not affect electrical performance or mechanical compatibility.

Q: Is the SF15GHB0G suitable for non-automotive applications?

A: Yes. The SF15GHB0G meets all electrical and mechanical requirements for the HER104-TP and is suitable for any application requiring 300 V, 1 A rectification. The automotive qualification (AEC-Q101) indicates enhanced reliability and quality assurance but does not restrict use to automotive applications. The SF15GHB0G features the fastest reverse recovery time (35 ns) among all substitutes.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects power dissipation during reverse bias conditions. The HER104-TP exhibits 5 mA leakage at 300 V, while all substitute parts exhibit 5 µA leakage. The 1000-fold reduction in leakage current results in significantly lower standby power consumption and heat generation, particularly in high-voltage applications or designs with extended idle periods.

Q: Are all listed parts RoHS3 compliant?

A: Yes. All parts listed in this reference are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), indicating compatibility with standard manufacturing processes and storage conditions without special handling requirements.

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