SF30CG-T Equivalent & Substitute Parts

Part Overview

The SF30CG-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 150 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter ranges for the intended application.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 150 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF30CG-T is determined by the following critical parameters: reverse voltage rating (150 V minimum), average rectified current capacity, forward voltage characteristics, recovery time classification, and through-hole axial package compatibility. Parts are grouped into two categories based on substitution relationship type:

Manufacturer Recommended Substitutes are designated by the original manufacturer or recognized industry sources as direct functional replacements. These parts satisfy the primary electrical requirements while accommodating minor variations in secondary parameters such as reverse leakage current or junction temperature range.

Parametric Equivalents maintain identical or near-identical electrical specifications and package form factor, providing direct pin-for-pin and functional compatibility with no design modifications required.

The following parameters establish substitution validity:

Voltage - DC Reverse (Vr) (Max): ≥ 150 V
Current - Average Rectified (Io): ≥ 2.5 A (minimum acceptable for reduced-current applications)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package Compatibility: Axial form factor

Parameter Comparison

Parameter	SF30CG-T (Main)	1N5806/TR (MFR Recommended)	1N6075 (MFR Recommended)	SF33G-TP (Parametric Equivalent)
Manufacturer	Diodes Incorporated	Microsemi Corporation	Microchip Technology	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	150 V	150 V	150 V	150 V
Current - Average Rectified (Io)	3 A	2.5 A	850 mA	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	875 mV @ 1 A	2.04 V @ 9.4 A	950 mV @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	25 ns	30 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 150 V	1 µA @ 150 V	1 µA @ 150 V	5 µA @ 150 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	A, Axial	A, Axial	DO-201AD, Axial
Operating Temperature - Junction	-65 to 150 °C	-65 to 175 °C	-65 to 155 °C	-65 to 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SF33G-TP (Parametric Equivalent) is the primary selection for direct replacement of the obsolete SF30CG-T. This part maintains identical electrical specifications (150 V, 3 A, 950 mV forward voltage, 35 ns recovery time) and package form factor (DO-201AD axial). The SF33G-TP is manufactured by Micro Commercial Co and carries active product status with ROHS3 compliance and REACH unaffected designation. No design modifications are required for this substitution.

1N5806/TR (Manufacturer Recommended Substitute) is suitable for applications where a 2.5 A current rating is acceptable. This part is manufactured by Microsemi Corporation with active product status, ROHS3 compliance, and REACH unaffected status. The 1N5806/TR exhibits superior reverse recovery time (25 ns versus 35 ns) and lower reverse leakage current (1 µA versus 5 µA), with an extended junction temperature range (-65 to 175 °C). The axial package form factor is compatible with through-hole mounting. Applications requiring the full 3 A rating should not use this substitute.

1N6075 (Manufacturer Recommended Substitute) is limited to applications with current requirements not exceeding 850 mA. This part is manufactured by Microchip Technology with active product status but carries RoHS non-compliance status and REACH unaffected designation. The 1N6075 is not recommended for new designs requiring RoHS3 compliance. Use of this part is restricted to legacy system maintenance or applications with explicit RoHS exemptions.

Frequently Asked Questions (FAQ)

Q: Can the SF33G-TP directly replace the SF30CG-T without circuit modifications?

A: Yes. The SF33G-TP is a parametric equivalent with identical voltage rating (150 V), current rating (3 A), forward voltage (950 mV @ 3 A), recovery time (35 ns), and reverse leakage current (5 µA @ 150 V). Both components use the DO-201AD axial through-hole package. No circuit modifications are required.

Q: What is the difference between the 1N5806/TR and SF30CG-T in terms of current handling?

A: The 1N5806/TR is rated for 2.5 A average rectified current, compared to the SF30CG-T's 3 A rating. Applications requiring continuous operation at 3 A should not use the 1N5806/TR. The 1N5806/TR is suitable for applications with peak or average current demands not exceeding 2.5 A.

Q: Why is the 1N6075 not recommended for new designs?

A: The 1N6075 carries RoHS non-compliance status. New designs subject to RoHS3 regulatory requirements must use either the SF33G-TP or 1N5806/TR. Additionally, the 1N6075 is rated for only 850 mA, making it unsuitable for applications requiring the full 3 A capacity of the SF30CG-T.

Q: Are there package compatibility concerns between the substitute parts?

A: The SF33G-TP uses the DO-201AD axial package, identical to the SF30CG-T. The 1N5806/TR and 1N6075 use the A axial package, which is mechanically compatible with through-hole mounting but may have minor dimensional differences. Verify PCB pad spacing and lead hole diameter specifications before substitution if package form factor differs.

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

A: The SF30CG-T and SF33G-TP both specify 35 ns reverse recovery time. The 1N5806/TR specifies 25 ns, indicating faster switching characteristics. In high-frequency switching applications, the 1N5806/TR may provide improved performance. In low-frequency rectification applications, this difference is not significant.

Q: Can the 1N5806/TR be used in applications requiring the full 3 A rating?

A: No. The 1N5806/TR is rated for 2.5 A maximum average rectified current. Using this part in applications requiring sustained 3 A operation will result in component overstress and potential failure. Use the SF33G-TP for full 3 A capacity requirements.

Q: What compliance certifications should be verified for new designs?

A: For new designs, verify ROHS3 compliance and REACH status. The SF33G-TP and 1N5806/TR both carry ROHS3 compliance and REACH unaffected designation, making them suitable for regulated applications. The 1N6075 is RoHS non-compliant and should not be used in new designs unless explicit regulatory exemptions apply.

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