HER301-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The HER301-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility across the specified parameter range.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HER301-AP is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 50 ns
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Acceptable Parameter Variation:

Voltage - Forward (Vf) (Max) @ If: 950 mV to 1 V @ 3 A
Current - Reverse Leakage @ Vr: 10 µA @ 50 V (fixed)
Capacitance @ Vr, F: 45 pF to 80 pF @ 4V, 1MHz

Substitute parts are classified into two categories: Direct Manufacturer Equivalent (same base product number, active status) and Parametric Equivalent (different manufacturer, identical electrical specifications within tolerance).

Parameter Comparison

Parameter	HER301-AP (Main)	HER301G-AP (Direct Equivalent)	HER301G A0G (Taiwan Semiconductor)	UF5400-E3/73 (Vishay)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 3 A	950 mV @ 3 A	1 V @ 3 A	1 V @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V
Capacitance @ Vr, F	80 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	60 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

HER301G-AP (Direct Manufacturer Equivalent - Preferred for Direct Replacement)

The HER301G-AP is the active production equivalent from Micro Commercial Co, the original manufacturer of the HER301-AP. This part maintains identical electrical specifications with the exception of forward voltage (950 mV versus 1 V at 3 A), which represents an improvement in efficiency. The part is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain continuity. Selection of HER301G-AP eliminates design re-qualification requirements for applications where the original HER301-AP was specified.

HER301G A0G (Taiwan Semiconductor Corporation - Parametric Equivalent)

The HER301G A0G from Taiwan Semiconductor Corporation provides full parametric equivalence to the HER301-AP across all critical electrical specifications. This part is active and ROHS3 compliant with REACH unaffected status. Capacitance is reduced to 60 pF at 4V, 1MHz, which may benefit high-frequency switching applications. This part is suitable for new designs requiring parametric compatibility without manufacturer-specific constraints.

UF5400-E3/73 (Vishay General Semiconductor - Diodes Division - Parametric Equivalent)

The UF5400-E3/73 from Vishay General Semiconductor - Diodes Division meets all mandatory electrical and mechanical parameters of the HER301-AP. This part carries active product status, ROHS3 compliance, and REACH unaffected designation. Capacitance is further reduced to 45 pF at 4V, 1MHz, optimizing performance in high-frequency rectification circuits. Highest inventory availability (2400 Pcs) supports immediate procurement requirements.

All three substitute parts are suitable for direct pin-compatible replacement in through-hole applications. Selection between alternatives should be based on supply chain preference, inventory availability, and application-specific performance requirements within the specified parameter tolerance range.

Frequently Asked Questions (FAQ)

Q: Can HER301G-AP be used as a direct replacement for HER301-AP?

A: Yes. HER301G-AP is the active production equivalent from the original manufacturer, Micro Commercial Co. All electrical specifications are identical or superior (forward voltage is 950 mV versus 1 V). The DO-201AD axial through-hole package is identical. No circuit modifications are required.

Q: What is the difference between HER301G-AP and HER301G A0G?

A: Both parts meet identical electrical specifications for voltage, current, and switching characteristics. The primary difference is manufacturer: HER301G-AP is from Micro Commercial Co, while HER301G A0G is from Taiwan Semiconductor Corporation. HER301G A0G has slightly lower capacitance (60 pF versus 80 pF), which may improve performance in high-frequency applications. Both are ROHS3 compliant and active products.

Q: Why does UF5400-E3/73 have lower capacitance than the other substitutes?

A: Capacitance variation within the specified range (45 pF to 80 pF @ 4V, 1MHz) is a normal characteristic difference between manufacturers. Lower capacitance in the UF5400-E3/73 does not affect compliance with the HER301-AP specification and may provide advantages in switching speed for certain circuit topologies.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. HER301G-AP, HER301G A0G, and UF5400-E3/73 are all ROHS3 compliant. HER301G A0G and UF5400-E3/73 carry additional REACH unaffected status.

Q: Can these parts be used in surface-mount applications?

A: No. All parts specified in this document, including the main part HER301-AP and all substitutes, are through-hole components in DO-201AD axial package. Surface-mount alternatives require separate specification and are not covered by this equivalency guide.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across the identical junction temperature range of -55°C to 150°C, matching the HER301-AP specification.

Q: Is forward voltage difference between HER301G-AP (950 mV) and other parts (1 V) significant?

A: The 50 mV difference at 3 A represents approximately 5% lower power dissipation in HER301G-AP. For most general purpose rectification applications, this difference is not critical. Applications with tight thermal budgets may benefit from the lower forward voltage of HER301G-AP.

Q: Which substitute part has the best availability?

A: UF5400-E3/73 from Vishay has the highest documented inventory at 2400 Pcs. HER301G-AP has 1041 Pcs, and HER301G A0G has 999 Pcs available. Availability should be confirmed with current suppliers for time-sensitive procurement.

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