HER306-AP Equivalent & Substitute Parts

Part Overview

The HER306-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 600 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 HER306-AP features fast recovery characteristics with a reverse recovery time of 75 ns and operates across a junction temperature range of -55°C to 150°C. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support broad application deployment.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 3 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	10 @ 600 V	µA
Capacitance @ Vr, F	50 @ 4V, 1MHz	pF
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the HER306-AP is determined by strict equivalence across the following critical parameters:

Voltage Rating: 600 V DC reverse voltage (Vr) maximum
Current Rating: 3 A average rectified current (Io)
Forward Voltage: 1.7 V maximum at 3 A forward current
Package: DO-201AD axial through-hole configuration
Mounting Type: Through-hole assembly
Operating Temperature Range: -55°C to 150°C junction temperature
Technology: Standard rectifier diode technology
Compliance: ROHS3 compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Direct Substitutes maintain identical electrical specifications and are suitable for one-to-one replacement without circuit modification.

Parametric Equivalents meet or exceed the core voltage, current, and thermal requirements but may exhibit variations in secondary parameters such as reverse recovery time, reverse leakage current, or junction capacitance. These variations remain within acceptable ranges for general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Mounting	Tj Range [°C]
HER306-AP	Micro Commercial Co	Obsolete	600	3	1.7 @ 3 A	75	10 @ 600 V	50 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150
HER306G-AP	Micro Commercial Co	Active	600	3	1.7 @ 3 A	75	10 @ 600 V	50 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150
UF5406GP-AP	Micro Commercial Co	Active	600	3	1.7 @ 3 A	75	10 @ 600 V	36 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150
HER306G A0G	Taiwan Semiconductor Corporation	Active	600	3	1.7 @ 3 A	75	10 @ 600 V	35 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150
SF38G A0G	Taiwan Semiconductor Corporation	Active	600	3	1.7 @ 3 A	35	5 @ 600 V	60 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150
SF38GHA0G	Taiwan Semiconductor Corporation	Active	600	3	1.7 @ 3 A	35	5 @ 600 V	60 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150
UF5406-E3/73	Vishay General Semiconductor - Diodes Division	Active	600	3	1.7 @ 3 A	75	10 @ 600 V	36 @ 4V, 1MHz	DO-201AD	Through Hole	-55 to 150

Engineering Selection Recommendations

Primary Recommendation: HER306G-AP

The HER306G-AP is the direct active-status equivalent manufactured by Micro Commercial Co. This part maintains identical electrical specifications to the obsolete HER306-AP across all critical parameters: 600 V reverse voltage, 3 A average rectified current, 1.7 V forward voltage at 3 A, and 75 ns reverse recovery time. HER306G-AP carries ROHS3 compliance and unlimited MSL rating. Selection of this part eliminates any parametric deviation and provides the highest compatibility assurance for direct replacement applications.

Secondary Recommendation: UF5406-E3/73

The UF5406-E3/73 manufactured by Vishay General Semiconductor - Diodes Division is an active-status parametric equivalent. This part matches the HER306-AP across voltage rating (600 V), current rating (3 A), forward voltage (1.7 V @ 3 A), and reverse recovery time (75 ns). Minor variations exist in reverse leakage current (10 µA @ 600 V, identical) and junction capacitance (36 pF versus 50 pF). UF5406-E3/73 is supplied in Cut Tape packaging and carries ROHS3 compliance with REACH unaffected status. This part supports high-volume procurement with 4100 units in stock.

Tertiary Recommendation: SF38G A0G and SF38GHA0G

The SF38G A0G and SF38GHA0G manufactured by Taiwan Semiconductor Corporation are parametric equivalents with enhanced performance characteristics. Both parts maintain 600 V reverse voltage and 3 A average rectified current ratings. These parts feature improved reverse recovery time (35 ns versus 75 ns) and reduced reverse leakage current (5 µA versus 10 µA @ 600 V). SF38GHA0G includes automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive reliability standards. Both parts carry ROHS3 compliance and REACH unaffected status.

Alternative Recommendation: UF5406GP-AP

The UF5406GP-AP manufactured by Micro Commercial Co is an active-status parametric equivalent with identical voltage, current, and thermal specifications. This part is supplied in Tape & Box packaging and carries ROHS3 compliance with REACH unaffected status. Selection of this part is appropriate when packaging format requirements align with Tape & Box delivery.

Frequently Asked Questions (FAQ)

Q: Can HER306G-AP replace HER306-AP in all applications?

A: Yes. HER306G-AP is the direct active-status equivalent with identical electrical specifications across all critical parameters. No circuit modification or performance adjustment is required. The only difference is product status: HER306-AP is obsolete while HER306G-AP is active.

Q: What is the difference between HER306G-AP and UF5406-E3/73?

A: Both parts meet the core requirements of 600 V reverse voltage, 3 A average rectified current, and 1.7 V forward voltage at 3 A. Both maintain 75 ns reverse recovery time. The primary difference is manufacturer: HER306G-AP is from Micro Commercial Co while UF5406-E3/73 is from Vishay General Semiconductor - Diodes Division. UF5406-E3/73 exhibits slightly lower junction capacitance (36 pF versus 50 pF). Both are ROHS3 compliant.

Q: Are SF38G A0G and SF38GHA0G suitable replacements for HER306-AP?

A: SF38G A0G and SF38GHA0G are parametric equivalents that meet voltage and current requirements. These parts feature improved reverse recovery time (35 ns versus 75 ns) and lower reverse leakage current (5 µA versus 10 µA). These enhancements are beneficial for applications sensitive to switching speed and leakage characteristics. SF38GHA0G includes automotive-grade qualification (AEC-Q101). Both parts are suitable for replacement in general-purpose rectification applications.

Q: What packaging options are available for substitutes?

A: All substitute parts are supplied in DO-201AD axial through-hole package, matching the original HER306-AP. Packaging format variations include: standard bulk (HER306G-AP), Tape & Box (UF5406GP-AP), and Cut Tape (SF38G A0G, UF5406-E3/73). Packaging selection depends on procurement and assembly requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance. HER306G-AP, UF5406GP-AP, HER306G A0G, SF38G A0G, SF38GHA0G, and UF5406-E3/73 are all ROHS3 compliant. All parts carry unlimited moisture sensitivity level (MSL 1).

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) affects switching speed and switching losses in rectification circuits. HER306-AP, HER306G-AP, UF5406GP-AP, HER306G A0G, and UF5406-E3/73 all maintain 75 ns reverse recovery time. SF38G A0G and SF38GHA0G feature faster recovery at 35 ns, reducing switching losses in high-frequency applications. For standard general-purpose rectification, both specifications are acceptable.

Q: What is the difference between SF38G A0G and SF38GHA0G?

A: SF38G A0G and SF38GHA0G are electrically identical with matching 600 V reverse voltage, 3 A current rating, 35 ns reverse recovery time, and 5 µA reverse leakage current. The primary distinction is that SF38GHA0G includes automotive-grade qualification (AEC-Q101), making it suitable for automotive applications requiring reliability certification. Both parts are ROHS3 compliant and REACH unaffected.

Q: Can I use UF5406-E3/73 in high-volume production?

A: Yes. UF5406-E3/73 is an active-status part with 4100 units in stock, supporting high-volume procurement. This part is supplied in Cut Tape packaging and carries ROHS3 compliance with REACH unaffected status. Electrical specifications match the HER306-AP across voltage, current, forward voltage, and reverse recovery time.

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