SF30FG-T Equivalent & Substitute Parts

Part Overview

The SF30FG-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 300 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part exhibits fast recovery characteristics with a reverse recovery time of 40 ns and operates across a junction temperature range of -65°C to 150°C.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	300 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	40 ns
Current - Reverse Leakage @ Vr	5 µA @ 300 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SF30FG-T is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 300 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Through Hole
Package compatibility: DO-201AD or equivalent axial package (DO-27/DO-201AA)

Secondary Compatibility Factors:

Speed classification: Fast Recovery preferred to match original performance
Reverse Recovery Time (trr): Lower values indicate superior switching performance
Operating Temperature Range: Must accommodate application requirements
RoHS and REACH compliance status

Substitute parts are grouped into two categories:

Category 1 - Direct Package Match (DO-201AD): Parts maintaining identical DO-201AD packaging with 300 V / 3 A ratings. These include 1N5403-E3/54, STTH3R04RL, and UF5403-E3/54.

Category 2 - Equivalent Package Variants (DO-27/DO-201AA): Parts with functionally equivalent axial through-hole packages (DO-27 or DO-201AA) rated for 300 V / 3 A. These include HER304GA-G, HER304GT-G, UF3004-G, and UF3004-HF.

Category 3 - Elevated Voltage Rating: STTH3R04RL provides 400 V reverse voltage rating while maintaining 3 A current capacity and DO-201AD packaging, suitable for applications requiring higher voltage margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 3A	Speed	trr (ns)	Package	Temp Range	Status
SF30FG-T	Diodes Incorporated	300 V	3 A	1.3 V	Fast Recovery ≤ 500ns	40	DO-201AD	-65°C ~ 150°C	Obsolete
1N5403-E3/54	Vishay General Semiconductor	300 V	3 A	1.2 V	Standard Recovery >500ns	—	DO-201AD	-55°C ~ 150°C	Active
HER304GA-G	Comchip Technology	300 V	3 A	1.0 V	Fast Recovery ≤ 500ns	50	DO-27	-55°C ~ 150°C	Active
HER304GT-G	Comchip Technology	300 V	3 A	1.0 V	Fast Recovery ≤ 500ns	50	DO-27	-55°C ~ 150°C	Active
STTH3R04RL	STMicroelectronics	400 V	3 A	1.5 V	Fast Recovery ≤ 500ns	35	DO-201AD	-55°C ~ 175°C	Active
UF3004-G	Comchip Technology	300 V	3 A	1.3 V	Fast Recovery ≤ 500ns	50	DO-27	-55°C ~ 125°C	Active
UF3004-HF	Comchip Technology	300 V	3 A	1.3 V	Fast Recovery ≤ 500ns	50	DO-27	-55°C ~ 125°C	Active
UF5403-E3/54	Vishay General Semiconductor	300 V	3 A	1.0 V	Fast Recovery ≤ 500ns	50	DO-201AD	-55°C ~ 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (DO-201AD Package Retention):

The UF5403-E3/54 manufactured by Vishay General Semiconductor provides the closest functional match to the SF30FG-T. This part maintains identical DO-201AD packaging, 300 V / 3 A electrical ratings, and active product status. The UF5403-E3/54 exhibits fast recovery characteristics with 50 ns reverse recovery time and superior forward voltage performance at 1.0 V @ 3 A. Operating temperature range extends to 150°C maximum junction temperature, matching the original specification. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

The 1N5403-E3/54 from Vishay also maintains DO-201AD packaging and 300 V / 3 A ratings with active status. However, this part operates with standard recovery speed (>500ns), which differs from the SF30FG-T fast recovery classification. This substitution is suitable for applications where switching speed is not performance-critical.

For Elevated Voltage Applications:

The STTH3R04RL manufactured by STMicroelectronics provides 400 V reverse voltage rating while maintaining 3 A current capacity and DO-201AD packaging. This part exhibits superior reverse recovery time of 35 ns and extended maximum junction temperature to 175°C. Selection of this part is appropriate when circuit design requires voltage margin above 300 V or when operating at elevated temperatures.

For Package Variant Acceptance (DO-27/DO-201AA):

The HER304GA-G and HER304GT-G from Comchip Technology both provide 300 V / 3 A ratings with fast recovery characteristics and DO-27 packaging. These parts are functionally equivalent to the SF30FG-T with superior forward voltage performance at 1.0 V @ 3 A. The HER304GA-G is supplied in Tape & Box packaging, while HER304GT-G is supplied in Tape & Reel format. Both maintain active product status and ROHS3 compliance.

The UF3004-G and UF3004-HF from Comchip Technology offer identical electrical specifications with DO-27 packaging. Both parts match the SF30FG-T forward voltage at 1.3 V @ 3 A and provide fast recovery performance. Operating temperature range is limited to -55°C ~ 125°C maximum junction temperature, which may restrict use in high-temperature applications.

Compliance and Availability:

All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). All substitute parts carry active product status, ensuring long-term availability and supply chain continuity. Inventory levels across substitute options range from 645 to 3237 pieces, providing procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can the SF30FG-T be directly replaced with any of these substitute parts?

A: Direct replacement depends on package requirements. The UF5403-E3/54 and 1N5403-E3/54 maintain identical DO-201AD packaging. The HER304GA-G, HER304GT-G, UF3004-G, and UF3004-HF use DO-27 packaging, which is mechanically compatible with DO-201AD in through-hole applications but may require PCB layout verification. The STTH3R04RL maintains DO-201AD packaging with elevated voltage rating.

Q: What is the difference between fast recovery and standard recovery speed classifications?

A: Fast recovery diodes exhibit reverse recovery time ≤ 500ns and are optimized for high-frequency switching applications. Standard recovery diodes have reverse recovery time >500ns and are suitable for lower-frequency rectification. The SF30FG-T is fast recovery (40 ns). The 1N5403-E3/54 is standard recovery, while UF5403-E3/54, HER304GA-G, HER304GT-G, UF3004-G, UF3004-HF, and STTH3R04RL are all fast recovery.

Q: Are there voltage rating differences among the substitutes?

A: Most substitutes maintain 300 V reverse voltage rating matching the SF30FG-T. The STTH3R04RL provides 400 V reverse voltage rating, offering higher voltage margin for applications requiring additional safety factor or operating in elevated voltage circuits.

Q: What are the temperature operating range differences?

A: The SF30FG-T operates from -65°C to 150°C junction temperature. Most active substitutes operate from -55°C to 150°C, with the exception of UF3004-G and UF3004-HF, which are limited to -55°C to 125°C. The STTH3R04RL extends to 175°C maximum junction temperature. Application requirements determine whether these differences are significant.

Q: How do forward voltage specifications affect circuit performance?

A: Forward voltage (Vf) determines voltage drop across the diode during conduction. The SF30FG-T exhibits 1.3 V @ 3 A. Substitutes range from 1.0 V to 1.5 V @ 3 A. Lower forward voltage reduces power dissipation and heat generation. Higher forward voltage increases power loss. Circuit design must account for these differences in power supply regulation and thermal management.

Q: What packaging considerations apply to DO-27 versus DO-201AD?

A: Both DO-27 and DO-201AD are axial through-hole packages with identical lead spacing and mounting compatibility. DO-27 is a legacy package designation equivalent to DO-201AA. Physical dimensions are similar, allowing mechanical interchangeability in most PCB designs. However, component body length may differ slightly; verification against PCB layout is recommended for space-constrained applications.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed maintain ROHS3 compliance status. The SF30FG-T is also ROHS3 compliant. This ensures compatibility with RoHS-regulated procurement requirements and environmental regulations.

Q: What is the significance of reverse leakage current specifications?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The SF30FG-T specifies 5 µA @ 300 V. Most substitutes maintain 5 µA @ 300 V, with the exception of UF5403-E3/54, which specifies 10 µA @ 300 V. Higher leakage current increases standby power consumption and may affect precision analog circuits. For most rectification applications, this difference is negligible.

Q: Which substitute offers the best overall performance match?

A: The UF5403-E3/54 provides optimal performance matching with identical DO-201AD packaging, 300 V / 3 A ratings, fast recovery characteristics, superior forward voltage at 1.0 V @ 3 A, and active product status. This part is recommended as the primary substitute for direct replacement applications.

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