1N5406 General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The 1N5406 is a general purpose rectifier diode rated for 600 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete by the original manufacturer (SMC Diode Solutions), necessitating identification of active equivalent and substitute parts for continued circuit implementation and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 3 A
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-65 to 175	°C
Technology	Standard	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1N5406 rectifier diode is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may vary within the range of 1.0 V to 1.3 V @ 3 A
Current - Reverse Leakage @ Vr: All substitutes maintain 5 µA @ 600 V
Operating Temperature - Junction: Substitute parts operate within -55°C to 155°C (narrower than original -65°C to 175°C)
Recovery Speed: Substitutes may employ either Standard Recovery (>500 ns) or Fast Recovery (≤500 ns) technology

Three active substitute parts meet these criteria and are available from alternative manufacturers.

Parameter Comparison

Parameter	1N5406 (SMC)	1N5406G (TSC)	FR305G B0G (TSC)	FR305GP-TP (MCC)
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	1.0 V @ 3 A	1.3 V @ 3 A	1.3 V @ 3 A
Speed	Standard Recovery >500 ns	Standard Recovery >500 ns	Fast Recovery ≤500 ns	Fast Recovery ≤500 ns
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-65 to 175°C	-55 to 150°C	-55 to 150°C	-55 to 155°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging Format	Not specified	Cut Tape (CT)	Not specified	Cut Tape (CT)
Inventory Status	8240 Pcs New Original In Stock	2400 Pcs New Original In Stock	661 Pcs New Original In Stock	2861 Pcs New Original In Stock

Engineering Selection Recommendations

1N5406G (Taiwan Semiconductor Corporation)

The 1N5406G is a direct electrical equivalent with active product status and ROHS3 compliance. This part maintains standard recovery speed characteristics identical to the original 1N5406 and features the lowest forward voltage drop (1.0 V @ 3 A) among available substitutes. The operating temperature range (-55°C to 150°C) is narrower than the original specification. This part is suitable for applications where standard recovery speed is required and operating temperatures remain within the specified range.

FR305G B0G (Taiwan Semiconductor Corporation)

The FR305G B0G is an active substitute with fast recovery speed (≤500 ns, 250 ns trr) and ROHS3 compliance. Forward voltage is specified at 1.3 V @ 3 A. The fast recovery characteristic reduces switching losses in high-frequency rectification circuits. Operating temperature range is -55°C to 150°C. This part is suitable for applications requiring improved switching performance and where the narrower temperature range is acceptable.

FR305GP-TP (Micro Commercial Co)

The FR305GP-TP is an active substitute with fast recovery speed (≤500 ns, 250 ns trr) and ROHS3 compliance. Forward voltage is specified at 1.3 V @ 3 A. The operating temperature range extends to -55°C to 155°C, providing slightly broader high-temperature coverage than the FR305G B0G. This part is suitable for applications requiring fast recovery characteristics with extended upper temperature operation.

All three substitutes maintain the critical electrical parameters (600 V reverse voltage, 3 A average rectified current, 5 µA reverse leakage) and identical DO-201AD axial through-hole packaging. Selection between substitutes depends on recovery speed requirements and operating temperature constraints specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 1N5406G directly replace the 1N5406 in all applications?

A: The 1N5406G is electrically compatible for applications where operating junction temperature remains within -55°C to 150°C. The original 1N5406 specification extends to 175°C. Applications operating above 150°C require evaluation of thermal conditions. Both parts maintain identical voltage and current ratings and standard recovery speed characteristics.

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

A: The 1N5406 and 1N5406G employ standard recovery speed (>500 ns), while FR305G B0G and FR305GP-TP employ fast recovery speed (≤500 ns). Fast recovery diodes reduce reverse recovery time, lowering switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification circuits. Selection depends on circuit operating frequency and switching loss requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 1N5406G, FR305G B0G, and FR305GP-TP are all ROHS3 compliant. The original 1N5406 RoHS status is not specified. All parts maintain REACH Unaffected status.

Q: What is the significance of forward voltage differences between substitutes?

A: Forward voltage varies from 1.0 V (1N5406G) to 1.3 V (FR305G B0G and FR305GP-TP) at 3 A. This 0.3 V difference affects power dissipation in the diode. Higher forward voltage results in increased heat generation. Circuit designs with tight thermal budgets should account for this variation. The difference is within standard rectifier diode specifications and does not affect circuit functionality in typical applications.

Q: Can FR305 series parts substitute for 1N5406 in all circuit topologies?

A: FR305 series parts (FR305G B0G and FR305GP-TP) are electrically compatible substitutes with identical voltage and current ratings. The fast recovery characteristic is beneficial in switching applications and does not degrade performance in standard rectification circuits. However, applications sensitive to reverse recovery time characteristics should confirm that fast recovery operation is acceptable for the specific circuit topology.

Q: What packaging formats are available for these substitutes?

A: The 1N5406G and FR305GP-TP are available in Cut Tape (CT) packaging format. The FR305G B0G packaging format is not specified. All parts are supplied in DO-201AD axial through-hole package configuration suitable for PCB insertion and wave soldering processes.

Q: Are there inventory considerations for part selection?

A: Current inventory levels are: 1N5406 (8240 pcs), 1N5406G (2400 pcs), FR305G B0G (661 pcs), and FR305GP-TP (2861 pcs). Inventory availability may influence selection for high-volume procurement. The 1N5406G and FR305GP-TP offer moderate inventory levels suitable for standard production requirements.

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