BYT77-TR Equivalent & Substitute Parts

Part Overview

The BYT77-TR is an 800V, 3A avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, supplied in Tape & Reel packaging with SOD-64 axial through-hole configuration. This component is classified as Active and maintains full RoHS3 compliance. The BYT77-TR serves applications requiring fast recovery characteristics with a reverse recovery time of 250 nanoseconds, making it suitable for high-frequency switching and protection circuits. Equivalent and substitute parts are identified based on matching electrical ratings and mechanical compatibility within the rectifier diode category.

Key Parameters

Parameter	BYT77-TR
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A
Reverse Recovery Time (trr)	250 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	SOD-64, Axial
Operating Temperature - Junction	-55°C ~ 175°C
Technology	Avalanche
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BYT77-TR are qualified based on the following critical parameters that determine functional equivalence:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Through Hole
Operating Temperature Range: Must encompass or exceed the application requirements

Mechanical Compatibility Criteria:

Package / Case: Axial through-hole configuration (SOD-64, DO-201AD, DO-201AA, or DO-27)
Lead configuration: Axial leads for direct board mounting

Compliance Criteria:

RoHS3 Compliant status
REACH Unaffected status

The three identified substitute parts (1N5407G, 1N5407RLG, and EGP30K) meet or exceed the primary electrical ratings of 800V reverse voltage and 3A average rectified current. All substitutes maintain through-hole axial mounting compatibility and full regulatory compliance. Differences in recovery speed classification, forward voltage characteristics, and temperature operating ranges are noted for application-specific selection.

Parameter Comparison

Parameter	BYT77-TR (Vishay)	1N5407G (Taiwan Semiconductor)	1N5407RLG (onsemi)	EGP30K (Fairchild)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	1 V @ 3 A	1 V @ 3 A	1.7 V @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Standard Recovery > 500ns, > 200mA	Standard Recovery > 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	250 ns	Not specified	Not specified	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 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°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Technology	Avalanche	Standard	Standard	Standard
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Product Status	Active	Active	Not For New Designs	Active

Engineering Selection Recommendations

Primary Substitute: 1N5407G (Taiwan Semiconductor Corporation)

The 1N5407G is the recommended substitute for new designs. It matches the BYT77-TR in all critical electrical parameters (800V reverse voltage, 3A average rectified current, 5µA reverse leakage). The part is Active status with full ROHS3 compliance. The forward voltage is lower (1V vs. 1.2V), resulting in reduced power dissipation. The standard recovery speed classification differs from the BYT77-TR's fast recovery specification; applications requiring sub-250ns recovery times should evaluate this difference. The DO-201AD package is mechanically compatible with through-hole axial mounting. Operating temperature range is -55°C to 150°C, which covers most industrial applications but does not extend to the BYT77-TR's upper limit of 175°C.

Secondary Substitute: EGP30K (Fairchild Semiconductor)

The EGP30K provides fast recovery characteristics (75ns trr) matching the BYT77-TR's speed classification. Electrical ratings are identical at 800V and 3A. The forward voltage is higher (1.7V vs. 1.2V), resulting in increased power dissipation. The part is Active status. Operating temperature range is -65°C to 150°C. The DO-201AD package provides mechanical compatibility. This substitute is suitable for applications where fast recovery performance is critical and higher forward voltage dissipation is acceptable.

Tertiary Substitute: 1N5407RLG (onsemi)

The 1N5407RLG meets electrical requirements at 800V and 3A but carries "Not For New Designs" product status. This part is suitable only for legacy system maintenance or replacement applications. Reverse leakage is higher at 10µA compared to 5µA for the primary substitute. Operating temperature range extends to -65°C but is limited to 150°C maximum. The axial package configuration (DO-201AA, DO-27) provides mechanical compatibility.

Selection Criteria Summary:

For new designs, select 1N5407G. For applications requiring extended high-temperature operation to 175°C, the BYT77-TR remains the only option among these substitutes. For applications prioritizing fast recovery performance with acceptable higher forward voltage, select EGP30K. Avoid 1N5407RLG for new designs due to obsolescence status.

Frequently Asked Questions (FAQ)

Q: Can the 1N5407G directly replace the BYT77-TR in existing circuits?

A: The 1N5407G is electrically compatible at the 800V and 3A ratings. Physical mounting is compatible as both use through-hole axial leads. However, the forward voltage difference (1V vs. 1.2V) will reduce power dissipation by approximately 0.6W at 3A operation. The standard recovery speed (>500ns) differs from the BYT77-TR's fast recovery (250ns); circuits sensitive to switching transients or operating at high frequencies should evaluate this parameter.

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

A: Recovery speed refers to the reverse recovery time (trr), the interval required for a diode to transition from forward conduction to reverse blocking. The BYT77-TR specifies 250ns fast recovery, while 1N5407G and 1N5407RLG specify standard recovery (>500ns). Fast recovery diodes generate less reverse current overshoot during switching transitions, reducing electromagnetic interference and switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency applications where recovery speed is not critical.

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

A: No. The BYT77-TR uses SOD-64 package, while substitutes use DO-201AD (1N5407G, EGP30K) or DO-201AA/DO-27 (1N5407RLG). All packages are axial through-hole configurations with compatible lead spacing for standard PCB mounting. Physical dimensions differ slightly; verify PCB layout clearances if space is constrained.

Q: What is the significance of the "Not For New Designs" status on 1N5407RLG?

A: This designation indicates the manufacturer (onsemi) has discontinued active development and recommends against using this part in new product designs. The part remains available for legacy system support and replacement applications. New designs should use 1N5407G or EGP30K.

Q: How does operating temperature range affect part selection?

A: The BYT77-TR operates to 175°C junction temperature, while all substitutes are limited to 150°C. Applications requiring sustained operation above 150°C must use the BYT77-TR. For applications operating below 150°C, all substitutes are suitable. The lower temperature limit (-55°C for 1N5407G, -65°C for EGP30K and 1N5407RLG) is not typically a limiting factor in most industrial applications.

Q: What is the impact of reverse leakage current differences?

A: The BYT77-TR and 1N5407G specify 5µA reverse leakage at 800V, while 1N5407RLG specifies 10µA. Higher reverse leakage increases standby power consumption and heat generation in blocking mode. For applications with extended blocking periods or high ambient temperatures, the lower leakage of 1N5407G is preferable. The difference is typically negligible in switching applications with short blocking intervals.

Q: Can EGP30K be used in place of BYT77-TR despite higher forward voltage?

A: Yes, EGP30K is electrically compatible at 800V and 3A ratings. The higher forward voltage (1.7V vs. 1.2V) results in approximately 1.5W additional power dissipation at 3A operation. This increased dissipation requires verification that thermal management (heatsinking, PCB copper area) is adequate. The superior fast recovery performance (75ns vs. 250ns) may provide benefits in high-frequency switching circuits, offsetting the higher forward voltage penalty.

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