FR155S-TP Equivalent & Substitute Parts

Part Overview

The FR155S-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 600 V DC reverse voltage and 1.5 A average rectified current in a DO-41 axial through-hole package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with variations in current rating, package configuration, or performance characteristics that remain within acceptable application parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	V
Reverse Recovery Time (trr)	250	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FR155S-TP is determined by the following critical parameters: reverse voltage rating (600 V minimum), average rectified current capacity, forward voltage drop, reverse recovery time, reverse leakage current, and through-hole axial mounting configuration. Substitute parts are grouped into two categories:

Direct Equivalent (Package Variant): FR155GP-TP maintains identical electrical specifications (600 V, 1.5 A, 1.3 V forward drop, 250 ns recovery time) but differs in package designation (DO-15 versus DO-41) and product status (Active versus Obsolete). This part is a direct functional replacement with identical performance characteristics.

Functional Substitutes (Current Rating Variants): Parts including 1N4937RLG, MUR260RLG, RGP10JE-E3/53, RGP10JE-E3/73, and SBYV26C-E3/73 maintain the 600 V reverse voltage rating and through-hole axial mounting but vary in average rectified current capacity (1 A to 2 A), forward voltage characteristics, and reverse recovery time. These parts are suitable for applications where the circuit can operate at reduced current levels or where improved recovery time performance is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status
FR155S-TP	Micro Commercial Co	600	1.5	1.3 @ 1.5 A	250	5 @ 600 V	DO-41	Obsolete
FR155GP-TP	Micro Commercial Co	600	1.5	1.3 @ 1.5 A	250	5 @ 600 V	DO-15	Active
1N4937RLG	onsemi	600	1.0	1.2 @ 1 A	300	5 @ 600 V	DO-41	Not For New Designs
MUR260RLG	onsemi	600	2.0	1.35 @ 2 A	75	5 @ 600 V	DO-41	Active
RGP10JE-E3/53	Vishay General Semiconductor - Diodes Division	600	1.0	1.3 @ 1 A	150	5 @ 600 V	DO-41	Active
RGP10JE-E3/73	Vishay General Semiconductor - Diodes Division	600	1.0	1.3 @ 1 A	250	5 @ 600 V	DO-41	Active
SBYV26C-E3/73	Vishay General Semiconductor - Diodes Division	600	1.0	2.5 @ 1 A	30	5 @ 600 V	DO-41	Active

Engineering Selection Recommendations

Primary Recommendation: FR155GP-TP is the direct equivalent replacement for FR155S-TP. Both parts are manufactured by Micro Commercial Co, maintain identical electrical specifications (600 V, 1.5 A, 1.3 V forward drop, 250 ns recovery time), and are ROHS3 compliant. FR155GP-TP is currently in Active product status with 1019 units in stock, providing immediate procurement availability. The only difference is the package designation (DO-15 versus DO-41), which represents a minor physical form factor variation within the same axial through-hole family.

Secondary Recommendations for Current-Derating Applications: MUR260RLG (onsemi) is suitable for applications where higher current capacity is beneficial. This part is Active status, ROHS3 compliant, and offers superior reverse recovery time (75 ns versus 250 ns), making it advantageous for high-frequency switching applications. However, it operates at 2 A rated current, which exceeds the FR155S-TP specification.

RGP10JE-E3/73 (Vishay) provides an alternative with identical reverse recovery time (250 ns) and forward voltage (1.3 V @ 1 A), maintaining compatibility with the FR155S-TP performance profile at reduced current rating (1 A). This part is Active status and ROHS3 compliant.

Not Recommended for New Designs: 1N4937RLG carries a "Not For New Designs" product status designation and should not be selected for new circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can FR155GP-TP be used as a direct replacement for FR155S-TP?

A: Yes. FR155GP-TP is electrically and functionally identical to FR155S-TP, with matching 600 V reverse voltage, 1.5 A current rating, 1.3 V forward voltage drop, and 250 ns reverse recovery time. The difference is package designation (DO-15 versus DO-41), both of which are axial through-hole configurations with compatible physical dimensions for standard PCB layouts.

Q: What is the difference between DO-41 and DO-15 packages?

A: Both DO-41 and DO-15 are axial through-hole diode packages with identical electrical performance. The designations refer to different physical form factors within the DO-204 family. DO-41 (DO-204AL) and DO-15 (DO-204AC) have slightly different body dimensions but are functionally interchangeable in through-hole applications.

Q: Can MUR260RLG replace FR155S-TP in all applications?

A: MUR260RLG maintains the 600 V reverse voltage rating and through-hole axial mounting but is rated for 2 A average rectified current versus 1.5 A for FR155S-TP. It is suitable for applications where the circuit operates at or below 1.5 A. The superior reverse recovery time (75 ns) makes it preferable for high-frequency switching circuits. MUR260RLG is Active status and ROHS3 compliant.

Q: Why is 1N4937RLG listed as a substitute if it has "Not For New Designs" status?

A: 1N4937RLG is included for reference in legacy system maintenance and repair scenarios where existing inventory may be available. For new circuit designs, Active status alternatives such as MUR260RLG, RGP10JE-E3/73, or FR155GP-TP are preferred.

Q: What does reverse recovery time (trr) indicate, and why does it vary among substitutes?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Lower trr values indicate faster switching performance, beneficial in high-frequency applications. FR155S-TP specifies 250 ns; MUR260RLG offers 75 ns (faster), while SBYV26C-E3/73 offers 30 ns (fastest). Selection depends on circuit switching frequency requirements.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, consistent with FR155S-TP specifications.

Q: What is the significance of the 600 V reverse voltage rating in substitute selection?

A: The 600 V reverse voltage rating is a critical parameter that must not be reduced in substitution. All listed substitute parts maintain this 600 V minimum specification, ensuring compatibility with circuits designed for this voltage class. Substitutes with lower voltage ratings are not acceptable.

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