FR151 General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The FR151 is a general purpose rectifier diode rated for 50 V DC reverse voltage and 1.5 A average rectified current in a through-hole DO-15 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the intended application.

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 V @ 1.5 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-65°C ~ 150°C	°C

Substitute Part Grouping Explanation

Substitution of the FR151 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial

Functional Compatibility Parameters:

Current - Average Rectified (Io): 1.5 A minimum
Voltage - Forward (Vf) (Max) @ If: ≤ 1.3 V @ 1.5 A
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 50 V

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications and active product status (FR151G, FR151G B0G). These parts maintain the same reverse recovery time (150 ns) and forward voltage characteristics.

Functional Substitutes: Parts with higher current ratings or modified recovery characteristics that satisfy the FR151 application requirements (1N5391GHA0G, EGP20A). These parts provide equivalent or superior performance within the specified voltage and package constraints.

Parameter Comparison

Parameter	FR151 (Main)	FR151G	FR151G B0G	1N5391GHA0G	EGP20A
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	1.3 V @ 1.5 A	1.3 V @ 1.5 A	1.1 V @ 1.5 A	950 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	150 ns	150 ns	150 ns	Not specified	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	70 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

FR151G and FR151G B0G are direct equivalents with active product status and ROHS3 compliance. Both parts maintain identical electrical specifications to the FR151, including 1.5 A current rating, 1.3 V forward voltage at 1.5 A, and 150 ns reverse recovery time. These parts are recommended as primary replacements for obsolete FR151 inventory. The operating temperature range is reduced to -55°C ~ 150°C compared to the FR151 (-65°C ~ 150°C); this difference must be evaluated against specific application requirements.

1N5391GHA0G provides functional substitution with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. This part maintains the 50 V reverse voltage and 1.5 A current rating with improved forward voltage characteristics (1.1 V @ 1.5 A). The recovery speed is standard (>500ns) rather than fast recovery, which may affect high-frequency switching applications. The operating temperature range is -55°C ~ 150°C.

EGP20A is a functional substitute with higher current capacity (2 A) and superior recovery characteristics (50 ns reverse recovery time). This part provides design margin for applications requiring higher current handling or faster switching. The forward voltage is lower (950 mV @ 2 A), reducing power dissipation. The operating temperature range matches the FR151 (-65°C ~ 150°C). Capacitance is higher (70 pF @ 4V, 1MHz), which may affect high-frequency performance.

Selection between direct equivalents and functional substitutes depends on application-specific requirements for operating temperature range, switching speed, and current margin.

Frequently Asked Questions (FAQ)

Q: Can FR151G directly replace FR151 in all applications?

A: FR151G maintains identical electrical specifications (50 V, 1.5 A, 1.3 V forward voltage, 150 ns recovery time) and through-hole DO-15 packaging. The operating temperature range is reduced from -65°C ~ 150°C to -55°C ~ 150°C. Direct replacement is valid for applications operating within -55°C to 150°C. Applications requiring operation below -55°C require evaluation of alternative parts.

Q: What is the difference between FR151G and FR151G B0G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications and active product status. FR151G B0G includes ROHS3 compliance designation. Both parts are suitable as direct replacements for FR151.

Q: When should 1N5391GHA0G be selected instead of FR151G?

A: 1N5391GHA0G is selected when automotive-grade qualification (AEC-Q101) is required or when improved forward voltage characteristics (1.1 V @ 1.5 A versus 1.3 V @ 1.5 A) reduce power dissipation. The standard recovery speed (>500ns) is suitable for low-frequency rectification but not for high-frequency switching applications requiring fast recovery characteristics.

Q: Is EGP20A a suitable replacement for FR151?

A: EGP20A is a functional substitute with higher current capacity (2 A versus 1.5 A) and faster recovery time (50 ns versus 150 ns). The 50 V reverse voltage rating and through-hole DO-15 packaging are compatible. EGP20A is suitable for applications where higher current margin or faster switching is beneficial. The higher capacitance (70 pF versus 30 pF) may affect high-frequency performance and requires circuit evaluation.

Q: Are all substitute parts available in the same DO-15 package?

A: All substitute parts are available in DO-204AC, DO-15, and axial package designations. Physical dimensions and lead spacing are compatible with FR151 through-hole PCB layouts.

Q: What compliance certifications apply to substitute parts?

A: FR151G and FR151G B0G are ROHS3 compliant. 1N5391GHA0G is ROHS3 compliant and AEC-Q101 qualified for automotive applications. EGP20A compliance status is not specified in available documentation. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: How does reverse recovery time affect part selection?

A: Reverse recovery time (trr) determines switching speed. FR151, FR151G, and FR151G B0G have 150 ns recovery time suitable for standard rectification. EGP20A has 50 ns recovery time for faster switching applications. 1N5391GHA0G has standard recovery (>500ns) suitable for low-frequency rectification. Application switching frequency determines whether fast or standard recovery is required.

Q: Can substitute parts be used interchangeably in existing designs?

A: Direct equivalents (FR151G, FR151G B0G) are interchangeable with FR151 within the specified operating temperature range. Functional substitutes (1N5391GHA0G, EGP20A) require circuit evaluation for forward voltage drop, recovery time, and capacitance effects on system performance.

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