SF32-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF32-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 100V DC reverse voltage and 3A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The SF32-TP operates across a junction temperature range of -55°C to 125°C and complies with RoHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	DO-201AD, Axial	-
Mounting Type	Through Hole	-
Operating Temperature - Junction	-55°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SF32-TP are identified based on strict electrical and mechanical parameter compatibility within the general purpose rectifier diode category. The primary substitution criteria are:

Electrical Parameters (Must Match or Exceed):

Voltage - DC Reverse (Vr) (Max): 100V minimum
Current - Average Rectified (Io): 3A minimum
Package / Case: DO-201AD, Axial (mechanical compatibility)
Mounting Type: Through Hole (assembly compatibility)

Compliance Parameters:

RoHS3 Compliant status
Operating temperature range compatibility with application requirements

Substitute parts are grouped into two categories: direct equivalents (matching 3A current rating) and higher-rated alternatives (exceeding 3A current rating). Both categories satisfy the electrical and mechanical requirements for substitution in applications designed for the SF32-TP.

Parameter Comparison

Parameter	SF32-TP (Main Part)	RGP30B-E3/73	UG4B-E3/73
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V
Current - Average Rectified (Io)	3 A	3 A	4 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	1.3 V @ 3 A	950 mV @ 4 A
Reverse Recovery Time (trr)	35 ns	150 ns	30 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 175°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RGP30B-E3/73 (Direct Equivalent - Preferred for Direct Replacement)

The RGP30B-E3/73 is a direct electrical equivalent to the SF32-TP, matching the 3A current rating and 100V reverse voltage specification. Both components share identical reverse leakage current characteristics and fast recovery speed classification. The RGP30B-E3/73 is manufactured by Vishay General Semiconductor - Diodes Division and maintains active product status with ROHS3 compliance. The extended operating temperature range (-65°C to 175°C) provides additional thermal margin compared to the SF32-TP (-55°C to 125°C). The forward voltage specification of 1.3V @ 3A is higher than the SF32-TP at 950mV @ 3A; this difference must be evaluated for power dissipation and thermal management in the target application. The reverse recovery time of 150ns is longer than the SF32-TP at 35ns, which may impact switching performance in high-frequency applications.

UG4B-E3/73 (Higher Current Rating Alternative)

The UG4B-E3/73 is a higher-rated substitute with a 4A average rectified current specification, exceeding the SF32-TP requirement of 3A. Both components maintain the 100V reverse voltage rating and DO-201AD package compatibility. The UG4B-E3/73 offers superior reverse recovery time performance at 30ns compared to the SF32-TP at 35ns, and matches the forward voltage specification of 950mV @ 4A. This component is manufactured by Vishay General Semiconductor - Diodes Division with active product status and ROHS3 compliance. The operating temperature range extends to 150°C, providing additional thermal headroom. Selection of the UG4B-E3/73 is appropriate for applications requiring higher current capacity or improved switching characteristics while maintaining mechanical and electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the RGP30B-E3/73 be used as a direct replacement for the SF32-TP?

A: The RGP30B-E3/73 is electrically and mechanically compatible with the SF32-TP. Both components share identical voltage and current ratings (100V, 3A), reverse leakage current (5µA @ 100V), and DO-201AD through-hole package specifications. The primary difference is forward voltage (1.3V vs. 950mV @ 3A), which affects power dissipation. Evaluation of thermal impact in the specific application is required before implementation.

Q: What is the difference between the RGP30B-E3/73 and UG4B-E3/73?

A: The RGP30B-E3/73 matches the SF32-TP current rating at 3A, while the UG4B-E3/73 provides a higher 4A rating. The UG4B-E3/73 offers faster reverse recovery time (30ns vs. 150ns) and lower forward voltage (950mV vs. 1.3V @ rated current). Both maintain 100V reverse voltage and DO-201AD package compatibility. Selection depends on application current requirements and switching performance needs.

Q: Are both substitute parts RoHS3 compliant?

A: Both the RGP30B-E3/73 and UG4B-E3/73 are ROHS3 compliant, matching the compliance status of the SF32-TP. Both components carry unlimited moisture sensitivity level (MSL 1) classification.

Q: Can the UG4B-E3/73 be used in applications designed for the SF32-TP?

A: The UG4B-E3/73 is mechanically and electrically compatible with the SF32-TP in terms of voltage rating (100V) and package (DO-201AD through-hole). The higher current rating (4A vs. 3A) does not prevent substitution; however, the lower forward voltage (950mV vs. 1.3V for the RGP30B-E3/73) and faster reverse recovery time (30ns) may alter circuit performance. Application-specific evaluation is necessary.

Q: What is the significance of reverse recovery time in selecting a substitute?

A: Reverse recovery time (trr) affects switching speed and electromagnetic interference characteristics. The SF32-TP specifies 35ns, the RGP30B-E3/73 specifies 150ns, and the UG4B-E3/73 specifies 30ns. In high-frequency switching applications, longer recovery times may increase switching losses and noise. In low-frequency rectification applications, this parameter has minimal impact on circuit performance.

Q: Are the operating temperature ranges compatible?

A: The SF32-TP operates from -55°C to 125°C. The RGP30B-E3/73 extends to -65°C to 175°C, and the UG4B-E3/73 extends to -55°C to 150°C. Both substitutes provide equal or superior thermal operating ranges. Applications operating within the SF32-TP temperature range are compatible with both substitutes.

Q: What inventory status should be considered for procurement?

A: The SF32-TP is classified as obsolete with 746 pieces in stock. The RGP30B-E3/73 is active with 761 pieces in stock, and the UG4B-E3/73 is active with 798 pieces in stock. Active product status ensures long-term availability and supply chain continuity for both substitute parts.

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