FR151S-TP Equivalent & Substitute Parts

Part Overview

The FR151S-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 1.5A average rectified current in a DO-41 axial through-hole package. This component is classified as obsolete, necessitating 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 acceptable parameter variations within the application envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1.5	V @ A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	-
Package / Case	DO-204AL, DO-41, Axial	-
Mounting Type	Through Hole	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the FR151S-TP are identified based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 50V minimum
Current - Average Rectified (Io): 1.5A or greater
Mounting Type: Through Hole
Package Category: Axial configuration
Speed Classification: Fast Recovery ≤ 500ns, > 200mA

Substitution Logic:

The FR151GP-TP is classified as a direct manufacturer equivalent. It shares the same base product number (FR151), identical electrical ratings (50V, 1.5A, 1.3V forward voltage, 150ns recovery time), and equivalent thermal performance (-55°C to 150°C). The primary difference is the package format: DO-15 versus DO-41. Both are axial through-hole packages with compatible mechanical footprints for standard PCB applications.

The 1N4933RLG is classified as a similar manufacturer part from onsemi. It maintains the 50V reverse voltage rating and axial through-hole configuration. However, the average rectified current is rated at 1.0A, which is lower than the FR151S-TP specification of 1.5A. The reverse recovery time is 300ns, which exceeds the FR151S-TP specification of 150ns. This part is suitable for applications where the circuit current requirement does not exceed 1.0A and where the extended recovery time is acceptable. The 1N4933RLG carries a "Not For New Designs" product status.

Parameter Comparison

Parameter	FR151S-TP	FR151GP-TP	1N4933RLG
Manufacturer	Micro Commercial Co	Micro Commercial Co	onsemi
Product Status	Obsolete	Active	Not For New Designs
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.0 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	1.3 V @ 1.5 A	1.2 V @ 1.0 A
Reverse Recovery Time (trr)	150 ns	150 ns	300 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	DO-204AL, DO-41	DO-204AC, DO-15	DO-204AL, DO-41
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-65 to 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FR151GP-TP (Direct Equivalent - Recommended Primary Choice)

The FR151GP-TP is the preferred substitute for the obsolete FR151S-TP. This part is manufactured by the same supplier (Micro Commercial Co) and carries an Active product status, ensuring long-term availability and supply chain stability. Electrical specifications are identical across all critical parameters: 50V reverse voltage, 1.5A average rectified current, 1.3V forward voltage at 1.5A, and 150ns reverse recovery time. The operating temperature range (-55°C to 150°C) matches the original specification. The primary distinction is the package format (DO-15 versus DO-41), both of which are standard axial through-hole configurations with compatible PCB footprints. ROHS3 compliance is maintained. This part is suitable for direct replacement in existing designs without circuit modification.

1N4933RLG (Similar Substitute - Limited Application)

The 1N4933RLG from onsemi is a functional substitute only for applications where the circuit current requirement does not exceed 1.0A. This part maintains the 50V reverse voltage rating and axial through-hole mounting configuration. However, the reduced current rating (1.0A versus 1.5A) and extended reverse recovery time (300ns versus 150ns) represent parameter degradation relative to the original specification. The product status is "Not For New Designs," indicating this part is in mature or declining production phase. This part is suitable only for legacy system maintenance or where circuit redesign has reduced current requirements below 1.0A. ROHS3 compliance is maintained.

Frequently Asked Questions (FAQ)

Q: Can FR151GP-TP be used as a direct replacement for FR151S-TP?

A: Yes. The FR151GP-TP is electrically equivalent to the FR151S-TP across all critical parameters: 50V reverse voltage, 1.5A average rectified current, 1.3V forward voltage, and 150ns reverse recovery time. The package format differs (DO-15 versus DO-41), but both are standard axial through-hole configurations with compatible mechanical footprints for PCB assembly. No circuit modification is required.

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

A: Both DO-41 (DO-204AL) and DO-15 (DO-204AC) are axial through-hole package formats for diodes. The primary difference is the physical body diameter and lead spacing. DO-41 has a larger body diameter than DO-15. Both packages are compatible with standard PCB through-hole assembly processes. Component placement and lead bend radius may require minor adjustment based on specific PCB layout, but electrical performance is identical.

Q: Is 1N4933RLG a suitable replacement for FR151S-TP?

A: The 1N4933RLG is a functional substitute only for applications where the circuit current requirement does not exceed 1.0A. The original FR151S-TP is rated for 1.5A average rectified current. The 1N4933RLG is rated for 1.0A, representing a 33% reduction in current capacity. Additionally, the reverse recovery time is 300ns compared to 150ns for the FR151S-TP. This part is suitable only for legacy system maintenance or where circuit redesign has reduced current requirements. The product status is "Not For New Designs."

Q: What compliance certifications apply to these substitute parts?

A: All three parts (FR151S-TP, FR151GP-TP, and 1N4933RLG) are ROHS3 compliant. The FR151GP-TP and 1N4933RLG carry REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: What is the moisture sensitivity level for these diodes?

A: The FR151S-TP and FR151GP-TP have a Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions. The 1N4933RLG has MSL listed as Not Applicable, also indicating no moisture sensitivity restrictions. All parts can be stored and handled under standard industrial conditions without special moisture control measures.

Q: Are there inventory considerations for selecting a substitute?

A: Current inventory levels are: FR151S-TP (858 pcs), FR151GP-TP (1090 pcs), and 1N4933RLG (3754 pcs). The FR151GP-TP offers the best combination of electrical equivalence and active product status. The 1N4933RLG has the highest inventory level but carries a "Not For New Designs" status and reduced current rating.

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