HER158-TP Equivalent & Substitute Parts

Part Overview

The HER158-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 1000 V DC reverse voltage and 1.5 A average rectified current in a DO-15 through-hole package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The HER158-TP operates across a junction temperature range of -55°C to 125°C and features fast recovery characteristics with a reverse recovery time of 75 nanoseconds.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 1.5 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5 @ 1000 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HER158-TP is determined by electrical and mechanical compatibility within the rectifier diode category. The primary substitution criterion is the maintenance of identical or superior electrical ratings across the following parameters:

Voltage Rating: DC reverse voltage must equal or exceed 1000 V
Current Rating: Average rectified current must equal or exceed 1.5 A
Forward Voltage: Forward voltage drop must not exceed specified limits at rated current
Recovery Characteristics: Reverse recovery time must support fast recovery operation
Reverse Leakage: Leakage current performance must remain within acceptable limits
Package Compatibility: Physical form factor must be DO-15 through-hole to ensure PCB compatibility
Temperature Range: Operating temperature range must support the application environment
Compliance: RoHS3 compliance status must be maintained

The HER208G-TP qualifies as a direct substitute based on these criteria, offering enhanced current capacity while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Parameter	HER158-TP	HER208G-TP	Unit
Manufacturer	Micro Commercial Co	Micro Commercial Co	—
Category	Diodes, Rectifiers	Diodes, Rectifiers	—
Voltage - DC Reverse (Vr) (Max)	1000	1000	V
Current - Average Rectified (Io)	1.5	2	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 1.5 A	1.7 @ 2 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	75	75	ns
Current - Reverse Leakage @ Vr	5 @ 1000 V	5 @ 1000 V	µA
Capacitance @ Vr, F	30 @ 4V, 1MHz	30 @ 4V, 1MHz	pF
Mounting Type	Through Hole	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-55 to 125	-55 to 150	°C
Product Status	Obsolete	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The HER208G-TP is the designated substitute for the obsolete HER158-TP. Selection of this substitute is supported by the following engineering factors:

Product Status: The HER158-TP is classified as obsolete, whereas the HER208G-TP maintains active product status with current manufacturing availability. This ensures long-term supply chain continuity and access to technical support.

Electrical Compatibility: The HER208G-TP maintains identical voltage ratings (1000 V DC reverse) and reverse recovery characteristics (75 ns) while providing increased current capacity (2 A versus 1.5 A). This uprating ensures the substitute operates within safe margins for applications designed around the original part.

Compliance Certification: Both components maintain ROHS3 compliance, ensuring regulatory alignment for applications subject to environmental restrictions.

Thermal Performance: The HER208G-TP extends the maximum junction temperature rating to 150°C, compared to 125°C for the HER158-TP, providing enhanced thermal margin in high-temperature operating environments.

Physical Form Factor: Identical DO-15 through-hole packaging ensures direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the HER208G-TP be used as a direct replacement for the HER158-TP in existing designs?

A: Yes. The HER208G-TP maintains identical voltage ratings, package form factor, and recovery characteristics. The increased current rating (2 A versus 1.5 A) represents an uprating that does not compromise compatibility. No circuit modifications are required.

Q: What is the primary difference between these two diodes?

A: The HER208G-TP provides higher average rectified current capacity (2 A) compared to the HER158-TP (1.5 A), while maintaining all other electrical specifications. The HER208G-TP also offers an extended maximum junction temperature rating of 150°C versus 125°C.

Q: Are there any package or mounting differences between these parts?

A: No. Both components use identical DO-15 through-hole axial packaging. Physical dimensions and PCB mounting requirements are equivalent.

Q: Why is the HER158-TP classified as obsolete?

A: The HER158-TP is no longer in active production. The HER208G-TP serves as the current production equivalent, offering improved specifications and ongoing manufacturing support.

Q: Does the HER208G-TP maintain the same forward voltage characteristics?

A: The forward voltage drop is 1.7 V maximum at the respective rated currents (1.5 A for HER158-TP, 2 A for HER208G-TP). Forward voltage performance remains consistent across both components.

Q: Are both components RoHS compliant?

A: Yes. Both the HER158-TP and HER208G-TP maintain ROHS3 compliance status, meeting environmental and regulatory requirements for restricted substance use.

Q: What is the reverse recovery time for the HER208G-TP?

A: The reverse recovery time is 75 nanoseconds, identical to the HER158-TP. This fast recovery characteristic is maintained in the substitute part.

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