1N5391 Equivalent & Substitute Parts

Part Overview

The 1N5391 is a general-purpose rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 1.5 A average rectified current in a DO-15 through-hole axial package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 1N5391 operates across a junction temperature range of -55°C to 150°C and is suitable for standard recovery rectification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 1.5 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-
Operating Temperature - Junction	-55 to 150	°C
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitute parts for the 1N5391 are selected based on strict electrical and mechanical parameter matching. The critical parameters determining substitution eligibility are:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1.5 A
Mounting Type: Through Hole
Package / Case: DO-15 or DO-204AC (axial configuration)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 1.1 V to 1.4 V @ 1.5 A
Speed: Standard Recovery or Fast Recovery
Current - Reverse Leakage @ Vr: 1 µA to 5 µA @ 50 V
Operating Temperature - Junction: -50°C to -65°C minimum; 150°C to 175°C maximum

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (identical electrical and package specifications), Similar Manufacturer Parts (equivalent electrical performance with minor package or thermal variations), and Parametric Equivalents (matching all critical electrical parameters with active product status).

Parameter Comparison

Parameter	1N5391 (Main)	1N5391GP-E3/54	1N5391-E3/54	GP15A-E3/54	PR1501-T	RGP15A-E3/54	PG5391_R2_00001
Manufacturer	onsemi	Vishay	Vishay	Vishay	Diodes Inc.	Vishay	Panjit
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	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	1.5 A	1.5 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 1.5 A	1.4 V @ 1.5 A	1.4 V @ 1.5 A	1.1 V @ 1.5 A	1.2 V @ 1.5 A	1.3 V @ 1.5 A	1.4 V @ 1.5 A
Speed	Standard Recovery >500ns	Standard Recovery >500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns	Fast Recovery ≤500ns	Standard Recovery >500ns
Reverse Recovery Time (trr)	-	2 µs	2 µs	3.5 µs	150 ns	150 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	5 µA @ 50 V	1 µA @ 50 V
Capacitance @ Vr, F	25 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	-	-	-	25 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AL, DO-41	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15
Operating Temperature - Junction	-55 to 150°C	-65 to 175°C	-50 to 150°C	-65 to 175°C	-65 to 150°C	-65 to 175°C	-55 to 150°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

1N5391GP-E3/54 (Vishay) and RGP15A-E3/54 (Vishay) are the preferred substitutes. Both parts maintain identical voltage and current ratings, through-hole DO-15 packaging, and are ROHS3 compliant with active product status. 1N5391GP-E3/54 provides standard recovery characteristics matching the original 1N5391 specification, while RGP15A-E3/54 offers fast recovery performance with reduced reverse recovery time (150 ns versus >500 ns), suitable for applications requiring faster switching.

Secondary Substitutes (Acceptable with Design Verification):

PR1501-T (Diodes Incorporated) and GP15A-E3/54 (Vishay) are acceptable alternatives. PR1501-T features fast recovery characteristics (150 ns) with lower forward voltage (1.2 V @ 1.5 A), beneficial for efficiency-sensitive applications. GP15A-E3/54 provides the lowest forward voltage (1.1 V @ 1.5 A) among all substitutes, reducing power dissipation. Both maintain DO-15 packaging and active product status with ROHS3 compliance.

Parametric Equivalent:

PG5391_R2_00001 (Panjit International) matches the original 1N5391 electrical specifications precisely, including standard recovery speed and forward voltage. This part offers the closest functional equivalence and is ROHS3 compliant with active product status.

Package Consideration:

1N5391-E3/54 (Vishay) uses DO-204AL (DO-41) packaging instead of DO-204AC (DO-15). While electrically equivalent, this package variant has different physical dimensions and pin spacing. Selection of this part requires PCB layout verification to confirm mechanical compatibility.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Selection should be based on specific application requirements regarding recovery speed, forward voltage characteristics, and thermal operating range.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1N5391 with any of the listed substitutes?

A: Direct replacement is possible for parts maintaining identical DO-15 (DO-204AC) packaging: 1N5391GP-E3/54, GP15A-E3/54, PR1501-T, RGP15A-E3/54, and PG5391_R2_00001. The 1N5391-E3/54 uses DO-204AL (DO-41) packaging and requires PCB layout verification before substitution.

Q: What is the difference between standard recovery and fast recovery diodes?

A: Standard recovery diodes have reverse recovery times exceeding 500 ns, while fast recovery diodes have reverse recovery times of 500 ns or less. Fast recovery diodes (PR1501-T and RGP15A-E3/54) switch faster, reducing switching losses in high-frequency applications. Standard recovery diodes (1N5391GP-E3/54 and PG5391_R2_00001) are suitable for lower-frequency rectification.

Q: Does forward voltage variation affect circuit performance?

A: Forward voltage ranges from 1.1 V to 1.4 V across the substitute parts. Lower forward voltage (GP15A-E3/54 at 1.1 V) reduces power dissipation and heat generation. Higher forward voltage (1N5391, 1N5391GP-E3/54, PG5391_R2_00001 at 1.4 V) increases power loss. Selection depends on thermal budget and efficiency requirements.

Q: Are all substitutes RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 1N5391 does not specify RoHS status. All parts are REACH unaffected.

Q: What is the temperature operating range difference?

A: The original 1N5391 operates from -55°C to 150°C. Vishay substitutes (1N5391GP-E3/54, GP15A-E3/54, RGP15A-E3/54) extend the upper limit to 175°C. Diodes Incorporated PR1501-T operates to 150°C. Panjit PG5391_R2_00001 matches the original -55°C to 150°C range. Selection should account for application thermal requirements.

Q: Can I use 1N5391-E3/54 as a drop-in replacement?

A: 1N5391-E3/54 is electrically equivalent but uses DO-204AL (DO-41) packaging instead of DO-204AC (DO-15). Physical dimensions and lead spacing differ. Verify PCB footprint compatibility before substitution.

Q: Which substitute offers the best efficiency?

A: GP15A-E3/54 provides the lowest forward voltage at 1.1 V @ 1.5 A, resulting in the lowest power dissipation and highest efficiency. PR1501-T at 1.2 V @ 1.5 A is the second-best option for efficiency-critical applications.

Q: Are there inventory considerations for substitution?

A: Current inventory levels vary: PG5391_R2_00001 (1161 pcs), PR1501-T (1025 pcs), RGP15A-E3/54 (938 pcs), 1N5391GP-E3/54 (872 pcs), GP15A-E3/54 (805 pcs), and 1N5391-E3/54 (770 pcs). Availability should be confirmed with suppliers for production requirements.

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