RL255M-TP Equivalent & Substitute Parts

Part Overview

The RL255M-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 600 V DC reverse voltage and 2.5 A average rectified current in a DO-15 through-hole axial package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified parameter ranges while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	2.5	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 2.5 A
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the RL255M-TP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Current - Average Rectified (Io): Must equal or exceed 2.5 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1 V at rated current
Current - Reverse Leakage @ Vr: Must not exceed 5 µA @ 600 V
Speed: Standard Recovery >500ns, > 200mA (Io)
Operating Temperature - Junction: Must span -55°C to 150°C

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: DO-204AC (DO-15) or equivalent axial configuration

Compliance Requirements:

RoHS Status: ROHS3 Compliant

Substitute parts are grouped based on whether they meet all electrical parameters at the specified rating levels. Parts with lower current ratings (such as 1.5 A) do not qualify as direct substitutes for 2.5 A applications.

Parameter Comparison

Parameter	RL255M-TP	RL255GP-TP	1N5397G B0G
Manufacturer	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	2.5 A	2.5 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2.5 A	1.1 V @ 2.5 A	1 V @ 1.5 A
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	R-3, Axial	DO-204AC, DO-15, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RL255GP-TP (Micro Commercial Co): This part is the primary equivalent for RL255M-TP replacement. Both parts share identical electrical ratings at 600 V and 2.5 A, operate across the same temperature range, and maintain ROHS3 compliance. The RL255GP-TP is currently in active production status, ensuring long-term availability. Forward voltage increases marginally to 1.1 V at 2.5 A and capacitance increases to 40 pF, both within acceptable engineering tolerances for general-purpose rectification applications. Packaging differs (R-3 versus DO-15), requiring mechanical board layout verification. This part is suitable for direct electrical substitution in applications where the R-3 package footprint is accommodated.

1N5397G B0G (Taiwan Semiconductor Corporation): This part does not qualify as a direct substitute for the RL255M-TP. Although it maintains 600 V reverse voltage rating and identical reverse leakage characteristics, the current rating is limited to 1.5 A, which is insufficient for applications requiring 2.5 A average rectified current. This part is suitable only for applications with reduced current requirements or as a derating option where thermal or reliability margins are prioritized over current capacity.

Frequently Asked Questions (FAQ)

Q: Can RL255GP-TP replace RL255M-TP in all applications?

A: RL255GP-TP is electrically equivalent at the rated 600 V and 2.5 A specifications. Substitution requires verification that the R-3 package footprint is compatible with the circuit board layout. Forward voltage increases from 1 V to 1.1 V at 2.5 A, which may affect power dissipation calculations in high-current applications.

Q: Why is 1N5397G B0G not recommended as a substitute?

A: The 1N5397G B0G is rated for 1.5 A average rectified current, which is 40% below the 2.5 A requirement of the RL255M-TP. Using this part in a 2.5 A application exceeds its current rating and violates electrical design specifications.

Q: What is the difference between DO-15 and R-3 packaging?

A: Both are axial through-hole packages for rectifier diodes. DO-15 (DO-204AC) and R-3 are different mechanical configurations with distinct lead spacing and body dimensions. Circuit board layout and component placement must accommodate the specific package geometry.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both RL255GP-TP and 1N5397G B0G are ROHS3 compliant, matching the compliance status of the RL255M-TP.

Q: What is the significance of product status (Obsolete vs. Active)?

A: RL255M-TP is obsolete, indicating discontinued production and limited future availability. RL255GP-TP and 1N5397G B0G are active products with ongoing manufacturing support and supply chain availability.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage differences of 0.1 V (1 V versus 1.1 V) may impact power dissipation and voltage drop calculations in precision rectification circuits. Applications with tight voltage regulation requirements should account for this variation in thermal and electrical design analysis.

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