BYX85TAP Equivalent & Substitute Parts

Part Overview

The BYX85TAP is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 800 V DC reverse voltage and 2 A average rectified current in a through-hole SOD-57 axial package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance parameters are met within the constraints of the application requirements, packaging compatibility, and regulatory compliance standards.

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
Mounting Type	Through Hole	—
Package / Case	SOD-57, Axial	—
Operating Temperature - Junction	-55 to 175	°C
Technology	Avalanche	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BYX85TAP are identified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 2 A minimum
Mounting Type: Through Hole
Package compatibility: SOD-57 or equivalent axial package footprint

Grouping Logic:

Group 1 - Parametric Equivalent (Preferred): BYW55-TAP matches all critical electrical parameters and operates within identical voltage and current ratings. This part maintains the same technology classification (Avalanche), forward voltage characteristics, and recovery time specifications. The primary difference is packaging format (Cut Tape versus Tape & Box), which does not affect electrical performance or board-level compatibility.

Group 2 - Functional Equivalent with Package Variation: HER208G-TP and EGP20K provide functional equivalence at the specified voltage and current ratings but utilize different package types (DO-15 instead of SOD-57). These parts meet the 800 V / 2 A electrical requirements and through-hole mounting requirement. However, physical package dimensions differ, requiring mechanical board layout verification.

Parameter Comparison

Parameter	BYX85TAP	BYW55-TAP	HER208G-TP	EGP20K
Manufacturer	Vishay	Vishay	Micro Commercial Co	Nexperia USA Inc.
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	1000 V	800 V
Current - Average Rectified (Io)	2 A	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	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	75 ns	75 ns
Current - Reverse Leakage @ Vr	1 µA @ 800 V	1 µA @ 800 V	5 µA @ 1000 V	5 µA @ 800 V
Package / Case	SOD-57, Axial	SOD-57, Axial	DO-15, Axial	DO-15, Axial
Operating Temperature - Junction	-55 to 175 °C	-55 to 175 °C	-55 to 150 °C	-65 to 150 °C
Technology	Avalanche	Avalanche	Standard	Standard
Product Status	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

BYW55-TAP is the primary substitute for BYX85TAP. This part is manufactured by the same supplier (Vishay General Semiconductor - Diodes Division), maintains identical electrical specifications across all critical parameters, and carries Active product status with ROHS3 compliance. The only distinction is the packaging format (Cut Tape versus Tape & Box), which does not affect electrical performance or board-level functionality. This substitute is suitable for direct replacement in all applications.

HER208G-TP is a functional equivalent that meets the 800 V / 2 A electrical requirements and maintains Active product status with ROHS3 compliance. However, this part utilizes a DO-15 package instead of SOD-57, requiring mechanical verification of board layout compatibility. The higher reverse voltage rating (1000 V) provides additional margin in overvoltage conditions. Forward voltage and reverse recovery time characteristics differ from the BYX85TAP due to different technology classification (Standard versus Avalanche).

EGP20K meets the 800 V / 2 A electrical requirements but carries Obsolete product status and is RoHS non-compliant. This part is not recommended for new designs or applications requiring regulatory compliance. The DO-15 package requires mechanical board layout verification. Use of this part is limited to legacy system maintenance where component availability and compliance are not constraints.

Frequently Asked Questions (FAQ)

Q: Can BYW55-TAP be used as a direct replacement for BYX85TAP?

A: Yes. BYW55-TAP is a parametric equivalent with identical electrical specifications. The difference in packaging format (Cut Tape versus Tape & Box) does not affect electrical performance or board-level compatibility. Both parts are manufactured by Vishay and carry ROHS3 compliance.

Q: What is the primary difference between BYX85TAP and HER208G-TP?

A: The primary differences are package type (SOD-57 versus DO-15) and technology classification (Avalanche versus Standard). Electrically, both parts meet the 800 V / 2 A requirements. HER208G-TP has a higher reverse voltage rating (1000 V) and faster recovery time (75 ns versus 4 µs). Board layout compatibility must be verified due to package dimension differences.

Q: Why is EGP20K listed as a substitute if it is obsolete?

A: EGP20K is included for reference in legacy system maintenance scenarios where this part may already be in use. For new designs and applications requiring regulatory compliance, EGP20K is not recommended due to Obsolete product status and RoHS non-compliance.

Q: Are there mechanical considerations when substituting SOD-57 with DO-15 packages?

A: Yes. SOD-57 and DO-15 are different axial package types with different physical dimensions. While both are through-hole components, board layout, lead spacing, and component placement must be verified before substitution. Consult package datasheets for specific dimensional requirements.

Q: What is the impact of different forward voltage ratings on circuit performance?

A: BYX85TAP and BYW55-TAP have forward voltage of 1 V @ 1 A, while HER208G-TP and EGP20K have forward voltage of 1.7 V @ 2 A. Higher forward voltage results in greater power dissipation in the diode. Circuit design must account for this difference in thermal management and voltage drop calculations.

Q: Does the higher reverse voltage rating of HER208G-TP (1000 V) provide any advantage?

A: The higher reverse voltage rating provides additional safety margin in applications subject to transient overvoltage conditions. However, this does not change the primary circuit function at the specified 800 V operating point. The advantage is limited to overvoltage protection scenarios.

Q: What compliance certifications should be verified for new designs?

A: For new designs, ROHS3 compliance is required in most jurisdictions. BYX85TAP, BYW55-TAP, and HER208G-TP all carry ROHS3 compliance. EGP20K is RoHS non-compliant and is not suitable for new designs requiring regulatory compliance.

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