HER306-TP Equivalent & Substitute Parts

Part Overview

The HER306-TP is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete product status, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical equivalence across voltage, current, and thermal specifications while accommodating different packaging formats and manufacturer variations.

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
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V	µA
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 HER306-TP is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 1.7 V @ 3 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package / Case: DO-201AD, Axial
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Secondary Variation Parameters (allowed to differ within functional limits):

Reverse Recovery Time (trr): Range 35 ns to 100 ns
Current - Reverse Leakage @ Vr: Range 1 µA to 10 µA @ 600 V
Capacitance @ Vr, F: Range 35 pF to 60 pF @ 4V, 1MHz
Packaging Format: Cut Tape (CT) or Tape & Reel (TR)
Manufacturer: Multiple qualified sources

All substitute parts listed maintain the mandatory electrical and mechanical parameters while offering active product status and improved availability compared to the obsolete HER306-TP.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Packaging	Product Status
HER306-TP	Micro Commercial Co	600	3	1.7 @ 3 A	75	10 @ 600 V	Bulk	Obsolete
UF5406GP-TP	Micro Commercial Co	600	3	1.7 @ 3 A	75	10 @ 600 V	Tape & Reel (TR)	Active
ER306_R2_00001	Panjit International Inc.	600	3	1.7 @ 3 A	35	1 @ 600 V	Cut Tape (CT)	Active
HER306G	Taiwan Semiconductor Corporation	600	3	1.7 @ 3 A	75	10 @ 600 V	Cut Tape (CT)	Active
SF38G	Taiwan Semiconductor Corporation	600	3	1.7 @ 3 A	35	5 @ 600 V	Cut Tape (CT)	Active
SF38G A0G	Taiwan Semiconductor Corporation	600	3	1.7 @ 3 A	35	5 @ 600 V	Cut Tape (CT)	Active
SF38GH	Taiwan Semiconductor Corporation	600	3	1.7 @ 3 A	35	5 @ 600 V	Cut Tape (CT)	Active
UF306G_R2_00001	Panjit International Inc.	600	3	1.7 @ 3 A	100	1 @ 600 V	Tape & Reel (TR)	Active
UF5406-E3/54	Vishay General Semiconductor - Diodes Division	600	3	1.7 @ 3 A	75	10 @ 600 V	Cut Tape (CT)	Active
UF5406-E3/73	Vishay General Semiconductor - Diodes Division	600	3	1.7 @ 3 A	75	10 @ 600 V	Cut Tape (CT)	Active

Engineering Selection Recommendations

Primary Substitutes (Identical Electrical Characteristics):

UF5406GP-TP, HER306G, UF5406-E3/54, and UF5406-E3/73 provide direct electrical equivalence to the HER306-TP with identical reverse recovery time (75 ns) and reverse leakage current (10 µA @ 600 V). These parts are manufactured by Micro Commercial Co, Taiwan Semiconductor Corporation, and Vishay General Semiconductor, all with active product status and ROHS3 compliance. Selection among these options depends on packaging format requirements: Tape & Reel (TR) for automated assembly or Cut Tape (CT) for manual handling.

Secondary Substitutes (Enhanced Performance Characteristics):

ER306_R2_00001, SF38G, SF38G A0G, and SF38GH offer improved reverse recovery time (35 ns) and reduced reverse leakage current (1 µA to 5 µA @ 600 V) compared to the original HER306-TP. These parts maintain all mandatory electrical parameters while providing faster switching characteristics. SF38GH includes AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade reliability. All secondary substitutes are active products with ROHS3 compliance.

Tertiary Substitute (Extended Recovery Time):

UF306G_R2_00001 maintains full electrical equivalence with a reverse recovery time of 100 ns, which remains within the fast recovery classification. This part is suitable for applications where slightly extended recovery time is acceptable and offers reduced reverse leakage current (1 µA @ 600 V).

All substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), matching the environmental compliance profile of the original HER306-TP.

Frequently Asked Questions (FAQ)

Q: Can I substitute HER306-TP with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts maintain the mandatory electrical parameters: 600 V reverse voltage, 3 A average rectified current, 1.7 V forward voltage at 3 A, and fast recovery classification. The DO-201AD axial through-hole package is identical across all substitutes, allowing direct mechanical replacement. No circuit modification is required.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) packaging provides individual diodes on carrier tape suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging supplies diodes on continuous reel format optimized for automated pick-and-place assembly equipment. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Why do some substitutes have faster reverse recovery time (35 ns vs. 75 ns)?

A: Reverse recovery time variation within the fast recovery classification (≤ 500 ns) reflects different semiconductor manufacturing processes and design optimization. Faster recovery time (35 ns) reduces switching losses and electromagnetic interference in high-frequency applications. The original HER306-TP specification of 75 ns remains acceptable for standard rectification applications. Selection of faster variants depends on specific circuit performance requirements.

Q: What does ROHS3 compliance mean for this diode?

A: ROHS3 compliance indicates the diode meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specific brominated flame retardants. All listed substitutes carry ROHS3 compliance, ensuring environmental and regulatory compatibility with modern electronic equipment standards.

Q: Is SF38GH suitable for automotive applications?

A: Yes. SF38GH carries AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and quality standards. This part is suitable for automotive and industrial applications requiring enhanced qualification documentation. Standard industrial variants (SF38G, SF38G A0G) are suitable for general-purpose applications without automotive qualification requirements.

Q: How do I select between multiple equivalent substitutes?

A: Selection criteria are: (1) Packaging format—choose Cut Tape (CT) for manual assembly or Tape & Reel (TR) for automated assembly; (2) Performance requirements—choose faster recovery time variants (35 ns) for high-frequency switching applications or standard variants (75 ns) for conventional rectification; (3) Qualification requirements—choose AEC-Q101 qualified SF38GH for automotive applications; (4) Manufacturer preference—choose based on supply chain, lead time, and inventory availability from qualified distributors.

Q: Are all substitute parts currently in stock?

A: Inventory status varies by distributor and time. The parameter comparison table indicates typical stock levels at the time of documentation. Verify current availability with authorized component distributors before finalizing procurement decisions.

Q: What is the operating temperature range for these diodes?

A: All listed parts, including the original HER306-TP and all substitutes, operate across a junction temperature range of -55°C to 150°C. This range accommodates industrial and commercial applications with standard thermal management. Verify specific application thermal requirements against this range during circuit design.

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