HER303-AP Equivalent & Substitute Parts

Part Overview

The HER303-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The HER303-AP features fast recovery characteristics with a 50 ns reverse recovery time, suitable for standard rectification applications requiring moderate voltage and current ratings.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the HER303-AP are classified based on electrical parameter compatibility and physical package equivalence. All substitute parts maintain the same 200 V reverse voltage rating and 3 A average rectified current specification, ensuring functional interchangeability in the primary application circuit. The DO-201AD axial through-hole package is preserved across all substitutes, allowing direct mechanical replacement without PCB redesign.

Substitution logic is determined by the following critical parameters:

Voltage - DC Reverse (Vr) (Max): 200 V (exact match required)
Current - Average Rectified (Io): 3 A (exact match required)
Reverse Recovery Time (trr): 50 ns or faster (equal or improved performance)
Current - Reverse Leakage @ Vr: 10 µA @ 200 V or lower (equal or improved performance)
Package / Case: DO-201AD, Axial (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 150°C minimum (equal or extended range acceptable)
RoHS Status: ROHS3 Compliant (compliance requirement)

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Temp Range
HER303-AP	Micro Commercial Co	Obsolete	200 V	3 A	1 V @ 3 A	50 ns	10 µA @ 200 V	DO-201AD	-55°C ~ 150°C
HER303G-AP	Micro Commercial Co	Active	200 V	3 A	950 mV @ 3 A	50 ns	10 µA @ 200 V	DO-201AD	-55°C ~ 150°C
STTH302RL	STMicroelectronics	Active	200 V	3 A	950 mV @ 3 A	35 ns	3 µA @ 200 V	DO-201AD	-55°C ~ 175°C
HER303G A0G	Taiwan Semiconductor Corporation	Active	200 V	3 A	1 V @ 3 A	50 ns	10 µA @ 200 V	DO-201AD	-55°C ~ 150°C
UF5402-E3/73	Vishay General Semiconductor - Diodes Division	Active	200 V	3 A	1 V @ 3 A	50 ns	10 µA @ 200 V	DO-201AD	-55°C ~ 150°C

Engineering Selection Recommendations

Direct Replacement (Active Status):

HER303G-AP from Micro Commercial Co is the primary direct replacement for the obsolete HER303-AP. Both parts share identical electrical specifications and package configuration. HER303G-AP carries active product status and maintains ROHS3 compliance, ensuring long-term availability and supply chain continuity.

Parametric Equivalents (Active Status):

HER303G A0G (Taiwan Semiconductor Corporation) and UF5402-E3/73 (Vishay General Semiconductor - Diodes Division) are parametric equivalents meeting all critical electrical and mechanical requirements. Both parts are active products with ROHS3 compliance and REACH unaffected status. These parts provide alternative sourcing options with equivalent performance characteristics.

Enhanced Performance Alternative:

STTH302RL from STMicroelectronics offers improved performance characteristics including faster reverse recovery time (35 ns versus 50 ns) and lower reverse leakage current (3 µA versus 10 µA). This part extends the maximum junction temperature to 175°C and is available in higher inventory quantities. STTH302RL is suitable for applications requiring enhanced thermal performance or faster switching characteristics while maintaining the same voltage and current ratings.

All substitute parts maintain ROHS3 compliance and are classified as active products, ensuring regulatory compliance and procurement availability.

Frequently Asked Questions (FAQ)

Q: Can HER303G-AP directly replace HER303-AP without circuit modification?

A: Yes. HER303G-AP is a direct replacement sharing identical electrical specifications (200 V, 3 A, 50 ns recovery time) and DO-201AD package configuration. No circuit modification is required.

Q: What is the primary difference between HER303G-AP and STTH302RL?

A: Both parts meet the 200 V, 3 A core requirements. STTH302RL provides faster reverse recovery time (35 ns versus 50 ns) and lower reverse leakage current (3 µA versus 10 µA). STTH302RL also supports higher junction temperature operation (175°C maximum versus 150°C).

Q: Are all substitute parts available in the same DO-201AD package?

A: Yes. All listed substitute parts use the DO-201AD axial through-hole package, enabling direct mechanical replacement on existing PCBs without layout modifications.

Q: Why is HER303-AP classified as obsolete?

A: HER303-AP is listed as obsolete by the manufacturer. Active alternatives such as HER303G-AP, HER303G A0G, UF5402-E3/73, and STTH302RL provide equivalent or enhanced functionality with ongoing manufacturer support.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the difference in forward voltage between substitute options?

A: HER303G-AP and STTH302RL specify 950 mV forward voltage at 3 A, while HER303G A0G and UF5402-E3/73 specify 1 V forward voltage at 3 A. Both specifications are within acceptable operating parameters for general-purpose rectification applications.

Q: Can STTH302RL be used in applications with temperature extremes?

A: STTH302RL supports junction temperatures up to 175°C, compared to 150°C for other substitutes. This extended range makes STTH302RL suitable for higher-temperature operating environments while maintaining electrical performance.

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