BYT56M-TAP Equivalent & Substitute Parts

Part Overview

The BYT56M-TAP is an avalanche diode rated for 1000 V DC reverse voltage with 3 A average rectified current, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component features fast recovery characteristics (≤500 ns) and is packaged in SOD-64 axial configuration. The part is currently active in production and RoHS3 compliant.

Substitute parts are identified for applications requiring equivalent electrical performance, alternative packaging formats, or sourcing flexibility. Substitution is necessary when the primary part experiences supply constraints, when alternative package styles are required for board layout optimization, or when design requirements permit operation within the specified parameter ranges of equivalent alternatives.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 3 A	V
Speed Classification	Fast Recovery ≤500 ns	ns
Reverse Recovery Time (trr)	100	ns
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Mounting Type	Through Hole	—
Package / Case	SOD-64, Axial	—
Operating Temperature - Junction	-55 to 175	°C
Technology	Avalanche	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BYT56M-TAP is determined by the following critical electrical parameters:

Voltage Rating: Minimum 1000 V DC reverse voltage (Vr)
Current Rating: Minimum 3 A average rectified current (Io)
Recovery Characteristics: Fast recovery performance (≤500 ns) or standard recovery (>500 ns) depending on application requirements
Forward Voltage: Maximum forward voltage drop at rated current
Reverse Leakage: Maximum reverse leakage current at rated voltage
Mounting Configuration: Through-hole axial package compatibility
Temperature Range: Operating junction temperature capability
Compliance: RoHS3 compliance and regulatory status

The three identified substitutes meet the core electrical requirements (1000 V, 3 A) but differ in technology classification, recovery speed, package designation, and temperature range. Each substitute maintains through-hole axial mounting compatibility with the original part.

Parameter Comparison

Parameter	BYT56M-TAP (Vishay)	1N5408G (Taiwan Semiconductor)	1N5408RLG (onsemi)	EGP30K (Fairchild)
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	800 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 3 A	1 V @ 3 A	1 V @ 3 A	1.7 V @ 3 A
Speed Classification	Fast Recovery ≤500 ns	Standard Recovery >500 ns	Standard Recovery >500 ns	Fast Recovery ≤500 ns
Reverse Recovery Time (trr)	100 ns	—	—	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	10 µA @ 1000 V	5 µA @ 800 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	SOD-64, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial
Operating Temperature - Junction	-55 to 175°C	-55 to 150°C	-65 to 150°C	-65 to 150°C
Technology	Avalanche	Standard	Standard	Standard
Product Status	Active	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

1N5408G (Taiwan Semiconductor Corporation)

The 1N5408G is an active production part with full RoHS3 compliance. It meets the 1000 V and 3 A electrical requirements with lower forward voltage (1 V vs. 1.4 V). The part operates within a -55 to 150°C junction temperature range, which is 25°C lower than the BYT56M-TAP maximum. Standard recovery characteristics (>500 ns) differ from the fast recovery profile of the original part. Package designation is DO-201AD, which is mechanically compatible with through-hole axial mounting. This substitute is suitable for applications where fast recovery is not a critical requirement and the reduced temperature ceiling is acceptable.

1N5408RLG (onsemi)

The 1N5408RLG carries a "Not For New Designs" product status, indicating onsemi has discontinued active development and recommends against incorporation into new designs. While electrically equivalent at 1000 V and 3 A ratings, this part should be reserved for legacy system maintenance or replacement applications only. The reverse leakage current is specified at 10 µA (versus 5 µA for the primary part), and the operating temperature range extends to -65°C minimum. RoHS3 compliance is confirmed.

EGP30K (Fairchild Semiconductor)

The EGP30K is an active production part with fast recovery characteristics (≤500 ns, 75 ns trr) matching the speed profile of the BYT56M-TAP. However, the reverse voltage rating is limited to 800 V, which is 200 V below the original specification. This part is suitable only for applications where the maximum reverse voltage requirement does not exceed 800 V. Forward voltage is higher at 1.7 V @ 3 A. RoHS compliance status is not specified in the provided data. Operating temperature range is -65 to 150°C.

Recommendation Summary

For direct substitution in applications requiring 1000 V reverse voltage capability, the 1N5408G is the preferred active alternative. The EGP30K is suitable only for 800 V maximum applications. The 1N5408RLG should not be selected for new designs due to its discontinued status.

Frequently Asked Questions (FAQ)

Q: Can the 1N5408G replace the BYT56M-TAP in all applications?

A: The 1N5408G meets the core electrical requirements (1000 V, 3 A) and is mechanically compatible through through-hole axial mounting. However, it operates at a lower maximum junction temperature (150°C vs. 175°C) and uses standard recovery characteristics instead of fast recovery. Applications operating near the 175°C thermal limit or requiring fast recovery performance must evaluate compatibility independently.

Q: Why is the EGP30K listed as a substitute if it only supports 800 V?

A: The EGP30K is included because it meets the 3 A current requirement and shares fast recovery characteristics with the BYT56M-TAP. It functions as a substitute only for applications where the actual reverse voltage stress does not exceed 800 V, even if the circuit design nominally specifies 1000 V. Circuit analysis is required to confirm 800 V adequacy.

Q: What is the difference between SOD-64 and DO-201AD packaging?

A: Both are through-hole axial packages suitable for PCB mounting. SOD-64 and DO-201AD differ in physical dimensions and lead spacing. Mechanical compatibility must be verified against the PCB layout and component footprint before substitution.

Q: Is the 1N5408RLG still available for purchase?

A: The 1N5408RLG carries a "Not For New Designs" status from onsemi, indicating the manufacturer no longer actively supports this part for new applications. Existing inventory may be available through distributors, but long-term availability is not guaranteed. New designs should not incorporate this part.

Q: What does "fast recovery" mean, and why does it matter?

A: Fast recovery (≤500 ns) refers to the time required for the diode to transition from conducting to blocking state when reverse bias is applied. Fast recovery reduces switching losses in high-frequency applications. Standard recovery (>500 ns) is acceptable for lower-frequency or DC applications where switching speed is not critical.

Q: Can I use the 1N5408G in a circuit designed for the BYT56M-TAP without any modifications?

A: Electrical substitution is possible within the specified parameter ranges. However, the lower forward voltage (1 V vs. 1.4 V) and reduced temperature ceiling (150°C vs. 175°C) must be evaluated against circuit requirements. Physical package differences (SOD-64 vs. DO-201AD) require PCB footprint verification.

Q: What is the significance of the "Avalanche" technology designation on the BYT56M-TAP?

A: Avalanche technology indicates the diode is designed to operate in reverse breakdown mode without damage, providing voltage regulation capability. The substitute parts use standard technology, which does not support intentional reverse breakdown operation. If the circuit relies on avalanche breakdown characteristics, substitution is not appropriate.

Q: Are all listed substitutes RoHS3 compliant?

A: The 1N5408G and 1N5408RLG are confirmed RoHS3 compliant. The EGP30K RoHS compliance status is not specified in the provided data and must be verified with the manufacturer or distributor before use in applications requiring RoHS certification.

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