BYX85TR Equivalent & Substitute Parts

Part Overview

The BYX85TR is an avalanche diode rated for 800 V DC reverse voltage and 2 A average rectified current, manufactured by Vishay General Semiconductor - Diodes Division. The device is packaged in SOD-57 axial configuration for through-hole mounting and is classified as Active product status. This part is ROHS3 compliant and suitable for applications requiring avalanche protection characteristics with standard recovery speed performance.

Substitute parts are identified to address packaging format variations, inventory availability, and alternative technology options while maintaining electrical compatibility within specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Reverse Recovery Time (trr)	4	µs
Current - Reverse Leakage @ Vr	1	µA @ 800 V
Package / Case	SOD-57, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 175	°C
Technology	Avalanche	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BYX85TR are grouped into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Identical Electrical Performance): BYW55-TR and BYW55-TAP are direct parametric equivalents sharing identical electrical specifications: 800 V reverse voltage, 2 A average rectified current, 1 V forward voltage at 1 A, 4 µs reverse recovery time, and 1 µA reverse leakage current at 800 V. Both devices use SOD-57 axial packaging and through-hole mounting. The primary difference is packaging format: BYW55-TR is supplied in Tape & Reel (TR) format, while BYW55-TAP is supplied in Cut Tape (CT) format. Both maintain identical junction temperature range (-55°C to 175°C) and ROHS3 compliance.

Manufacturer Recommended Alternatives (Different Technology/Package): EGP20K and HER208G-TP are manufacturer-recommended alternatives that differ in technology classification and package format. These parts maintain the 800 V (or higher) reverse voltage and 2 A current ratings but employ standard recovery technology rather than avalanche technology. EGP20K uses DO-15 packaging with Bulk supply format and is classified as Obsolete product status. HER208G-TP uses DO-15 packaging with Cut Tape supply format and is classified as Active product status with 1000 V reverse voltage rating.

Substitution logic is based strictly on the following key parameters: Voltage - DC Reverse (Vr) (Max), Current - Average Rectified (Io), Voltage - Forward (Vf) (Max) @ If, Reverse Recovery Time (trr), Current - Reverse Leakage @ Vr, Package / Case, Mounting Type, and Operating Temperature - Junction.

Parameter Comparison

Parameter	BYX85TR	BYW55-TR	BYW55-TAP	EGP20K	HER208G-TP
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	1000 V
Current - Average Rectified (Io)	2 A	2 A	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1.7 V @ 2 A	1.7 V @ 2 A
Reverse Recovery Time (trr)	4 µs	4 µs	4 µs	75 ns	75 ns
Current - Reverse Leakage @ Vr	1 µA @ 800 V	1 µA @ 800 V	1 µA @ 800 V	5 µA @ 800 V	5 µA @ 1000 V
Package / Case	SOD-57, Axial	SOD-57, Axial	SOD-57, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C	-65°C to 150°C	-55°C to 150°C
Technology	Avalanche	Avalanche	Avalanche	Standard	Standard
Product Status	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

BYW55-TR and BYW55-TAP are direct parametric equivalents to the BYX85TR with identical electrical specifications and SOD-57 axial packaging. Both parts are Active product status and ROHS3 compliant. Selection between these two equivalents depends on supply chain requirements: BYW55-TR is supplied in Tape & Reel format, while BYW55-TAP is supplied in Cut Tape format. Both maintain full compatibility with the original BYX85TR specification.

HER208G-TP is an Active product status alternative offering 1000 V reverse voltage rating (exceeding the 800 V requirement) with ROHS3 compliance. This part uses DO-15 packaging instead of SOD-57, requiring PCB layout modification. The forward voltage is higher at 1.7 V compared to 1 V, and reverse recovery time is significantly faster at 75 ns compared to 4 µs. Reverse leakage current is higher at 5 µA. Maximum junction temperature is limited to 150°C compared to 175°C for the BYX85TR.

EGP20K is classified as Obsolete product status and RoHS non-compliant. This part is not recommended for new designs or applications requiring regulatory compliance. The part uses DO-15 packaging and exhibits higher forward voltage and reverse leakage characteristics compared to the BYX85TR.

Frequently Asked Questions (FAQ)

Q: Can BYW55-TR and BYW55-TAP be used interchangeably with BYX85TR?

A: Yes. Both BYW55-TR and BYW55-TAP are parametric equivalents with identical electrical specifications (800 V, 2 A, 1 V forward voltage, 4 µs recovery time) and SOD-57 axial packaging. The only difference is supply format: Tape & Reel versus Cut Tape. No circuit modifications are required.

Q: What are the key differences between BYX85TR and HER208G-TP?

A: HER208G-TP differs in three critical areas: (1) Package format is DO-15 instead of SOD-57, requiring PCB layout changes; (2) Forward voltage is 1.7 V at 2 A compared to 1 V at 1 A, affecting power dissipation; (3) Reverse recovery time is 75 ns compared to 4 µs, indicating faster switching characteristics. HER208G-TP offers higher reverse voltage rating (1000 V) and is Active product status with ROHS3 compliance.

Q: Is EGP20K suitable for new designs?

A: No. EGP20K is classified as Obsolete product status and is RoHS non-compliant. This part is not recommended for new designs or applications requiring regulatory compliance with current environmental standards.

Q: What packaging considerations apply when substituting with HER208G-TP?

A: HER208G-TP uses DO-15 axial packaging, which differs physically from the SOD-57 package of BYX85TR. While both are through-hole axial devices, the DO-15 package has different lead spacing and body dimensions. PCB footprint modification is required. Verify mechanical clearance and lead bend radius compatibility with your application before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: BYW55-TR, BYW55-TAP, and HER208G-TP are ROHS3 compliant. EGP20K is RoHS non-compliant and should not be used in applications requiring environmental compliance certification.

Q: What is the temperature range difference between BYX85TR and substitute parts?

A: BYX85TR operates from -55°C to 175°C junction temperature. BYW55-TR and BYW55-TAP maintain this identical range. HER208G-TP is limited to -55°C to 150°C, reducing maximum junction temperature by 25°C. EGP20K operates from -65°C to 150°C. Verify application temperature requirements before substitution.

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