RL201-AP Equivalent & Substitute Parts

Part Overview

The RL201-AP is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The part operates across a junction temperature range of -55°C to 150°C and complies with ROHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 2 A
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	20	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150	°C
Package / Case	DO-204AC, DO-15, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RL201-AP is determined by electrical and mechanical compatibility within the following parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Package / Case: Must be DO-204AC, DO-15, or equivalent axial through-hole configuration
Mounting Type: Must be through-hole
Operating Temperature Range: Must encompass -55°C to 150°C
RoHS Compliance: Must meet ROHS3 standard

Allowable Variation Parameters:

Current - Average Rectified (Io): Substitute may be rated at or above 2 A
Voltage - Forward (Vf): Substitute may vary within application tolerance
Recovery Speed: Substitute may be standard or fast recovery
Current - Reverse Leakage: Substitute must not exceed specified maximum

The FR151G B0G meets all critical matching parameters and is classified as an active product, making it a valid substitute despite a lower current rating of 1.5 A, provided circuit design accommodates this reduction.

Parameter Comparison

Parameter	RL201-AP	FR151G B0G	Unit
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	—
Product Status	Obsolete	Active	—
Voltage - DC Reverse (Vr) (Max)	50	50	V
Current - Average Rectified (Io)	2	1.5	A
Voltage - Forward (Vf) (Max) @ If	1 @ 2 A	1.3 @ 1.5 A	V
Current - Reverse Leakage @ Vr	5 @ 50 V	5 @ 50 V	µA
Capacitance @ Vr, F	20 @ 4V, 1MHz	20 @ 4V, 1MHz	pF
Operating Temperature - Junction	-55 to 150	-55 to 150	°C
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	—
Mounting Type	Through Hole	Through Hole	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Recovery Speed	Standard >500ns	Fast ≤500ns	—

Engineering Selection Recommendations

The FR151G B0G is an active substitute for the obsolete RL201-AP. Both components share identical reverse voltage ratings (50 V), operating temperature ranges (-55°C to 150°C), package configurations (DO-204AC/DO-15 axial through-hole), and RoHS3 compliance status.

The primary design consideration is the current rating differential: the FR151G B0G is rated for 1.5 A average rectified current compared to the RL201-AP's 2 A rating. Circuit designs operating at or below 1.5 A average rectified current can directly substitute the FR151G B0G without modification. Designs requiring the full 2 A capacity must evaluate alternative parts or circuit redesign.

The FR151G B0G features fast recovery characteristics (≤500ns) compared to the RL201-AP's standard recovery (>500ns), which may provide performance benefits in switching applications. Forward voltage characteristics differ slightly (1.3 V @ 1.5 A versus 1 V @ 2 A), reflecting the current rating difference and recovery speed classification.

Both components maintain identical reverse leakage current (5 µA @ 50 V) and junction capacitance (20 pF @ 4V, 1MHz) specifications, ensuring compatibility in filtering and transient suppression applications.

Frequently Asked Questions (FAQ)

Q: Can the FR151G B0G directly replace the RL201-AP in all applications?

A: Direct replacement is possible only in circuits where the average rectified current does not exceed 1.5 A. The FR151G B0G is rated for 1.5 A, while the RL201-AP is rated for 2 A. Circuits operating at higher currents require alternative solutions or design modification.

Q: Are the package configurations identical between these parts?

A: Both components use DO-204AC/DO-15 axial through-hole packages. Physical dimensions and lead spacing are compatible, allowing direct PCB substitution without layout modification.

Q: What is the significance of the recovery speed difference?

A: The RL201-AP features standard recovery (>500ns), while the FR151G B0G features fast recovery (≤500ns). Fast recovery reduces switching losses and improves efficiency in high-frequency rectification circuits. Standard recovery is adequate for line-frequency and low-frequency applications.

Q: Do both parts meet the same compliance standards?

A: Both the RL201-AP and FR151G B0G are ROHS3 compliant. The FR151G B0G additionally carries REACH Unaffected status. Both share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: Why is the RL201-AP classified as obsolete?

A: Obsolescence indicates the part is no longer manufactured or supported by the original supplier. The FR151G B0G, classified as active, represents a current production alternative meeting equivalent electrical and mechanical specifications.

Q: How do forward voltage characteristics affect circuit performance?

A: The FR151G B0G exhibits 1.3 V forward voltage at 1.5 A, compared to 1 V at 2 A for the RL201-AP. This difference reflects the lower current rating and fast recovery classification. In power supply applications, the higher forward voltage results in slightly increased power dissipation, which must be evaluated against thermal design margins.

Q: Are there any moisture sensitivity considerations?

A: Both components carry MSL (Moisture Sensitivity Level) rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

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