HER154-AP Equivalent & Substitute Parts

Part Overview

The HER154-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 300 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 substitutes necessary for ongoing design support and production continuity. The part features fast recovery characteristics with a 50 ns reverse recovery time, suitable for standard rectification applications requiring moderate current handling at 300 V operation.

Substiute Parts

HER154-AP

Micro Commercial CoIn Stock: 1031HER154-AP Datasheet

Current PartRFQ

HER204G-AP

Micro Commercial CoIn Stock: 782HER204G-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER154-AP is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute must maintain the 300 V DC reverse voltage specification to ensure safe operation in the target circuit.

Current Rating: The substitute current rating must equal or exceed the 1.5 A average rectified current requirement. Higher current ratings provide design margin without compromising functionality.

Package Type: The substitute must use the DO-15 through-hole axial package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Recovery Characteristics: The substitute must maintain fast recovery performance (≤500 ns for currents >200 mA) with a 50 ns reverse recovery time to preserve circuit switching behavior.

Reverse Leakage: The substitute must not exceed 5 µA reverse leakage current at 300 V to maintain equivalent blocking performance.

Temperature Range: The substitute operating temperature range must encompass or exceed the -55°C to 125°C specification of the original part.

Compliance: The substitute must maintain RoHS3 compliance and equivalent regulatory certifications.

Parameter Comparison

Engineering Selection Recommendations

The HER204G-AP is a direct substitute for the HER154-AP based on the following criteria:

Electrical Compatibility: Both parts share identical voltage ratings (300 V), reverse recovery time (50 ns), reverse leakage current (5 µA @ 300 V), and forward voltage characteristics (1 V). The HER204G-AP provides a higher current rating of 2 A compared to the 1.5 A of the HER154-AP, ensuring adequate margin for the original application.

Mechanical Compatibility: Both parts use the DO-15 through-hole axial package, enabling direct PCB layout compatibility without redesign.

Product Status: The HER204G-AP holds active product status from Micro Commercial Co, ensuring continued availability and supply chain stability. The HER154-AP is obsolete, making the HER204G-AP the appropriate long-term solution.

Compliance and Certifications: Both parts maintain RoHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and equivalent regulatory classifications (ECCN: EAR99, HTSUS: 8541.10.0080). The HER204G-AP includes REACH Unaffected status.

Temperature Range: The HER204G-AP extends the operating temperature range to -55°C ~ 150°C, exceeding the original -55°C ~ 125°C specification and providing enhanced thermal performance margin.

Frequently Asked Questions (FAQ)

Q: Can the HER204G-AP directly replace the HER154-AP in existing designs?

A: Yes. The HER204G-AP is electrically and mechanically compatible with the HER154-AP. Both parts share identical voltage ratings, package type (DO-15), and recovery characteristics. The higher current rating (2 A vs. 1.5 A) of the HER204G-AP provides additional design margin without affecting circuit operation.

Q: What is the primary reason for substitution?

A: The HER154-AP is classified as obsolete. The HER204G-AP is an active product from the same manufacturer, ensuring continued availability and supply chain support.

Q: Are there any electrical performance differences between these parts?

A: No significant differences exist in electrical performance. Both parts operate at 300 V reverse voltage, exhibit 50 ns reverse recovery time, and maintain 5 µA reverse leakage current at rated voltage. Forward voltage characteristics are equivalent at their respective rated currents.

Q: Does the higher current rating of the HER204G-AP affect circuit behavior?

A: No. A higher current rating does not alter circuit operation when the actual circuit current remains below the original 1.5 A specification. The substitute simply provides additional capacity margin.

Q: Are the packages identical?

A: Yes. Both parts use the DO-15 through-hole axial package (DO-204AC). No PCB layout modifications are required for substitution.

Q: What compliance certifications apply to the HER204G-AP?

A: The HER204G-AP is RoHS3 compliant, MSL Level 1 (unlimited), REACH Unaffected, and classified as ECCN: EAR99 for export purposes.

Q: Is the extended temperature range of the HER204G-AP beneficial?

A: The HER204G-AP operating range of -55°C ~ 150°C exceeds the original -55°C ~ 125°C specification. This extended range provides additional thermal margin for applications operating at elevated junction temperatures.