BY527TAP Equivalent & Substitute Parts

Part Overview

The BY527TAP is an avalanche diode rated for 800 V DC reverse voltage with 2 A average rectified current, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component in SOD-57 axial package is designed for applications requiring avalanche breakdown protection and standard recovery characteristics. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified based on matching or exceeding the primary electrical specifications: reverse voltage rating, average rectified current, and forward voltage characteristics. Alternative components may be required due to packaging preferences, supply chain considerations, or specific application requirements for enhanced performance parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.65 V @ 10 A	V
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°C ~ 175°C	-
Technology	Avalanche	-
Product Status	Active	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the BY527TAP are qualified based on the following electrical and mechanical criteria:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 2 A minimum
Mounting Type: Through Hole
Package Category: Axial configuration

Secondary Compatibility Factors:

Forward voltage characteristics within acceptable operating ranges
Reverse leakage current specifications
Operating temperature range compatibility
Through-hole mounting compatibility with standard PCB layouts

The substitute parts identified (EGP20K and HER208G-TP) meet or exceed the primary electrical specifications. EGP20K matches the 800 V reverse voltage rating with identical 2 A current capacity. HER208G-TP exceeds the reverse voltage specification at 1000 V while maintaining 2 A current capacity, providing enhanced voltage margin for applications with transient overvoltage conditions.

Parameter Comparison

Parameter	BY527TAP (Main)	EGP20K (Substitute)	HER208G-TP (Substitute)
Manufacturer	Vishay General Semiconductor	Nexperia USA Inc.	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	1000 V
Current - Average Rectified (Io)	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.65 V @ 10 A	1.7 V @ 2 A	1.7 V @ 2 A
Reverse Recovery Time (trr)	4 µs	75 ns	75 ns
Current - Reverse Leakage @ Vr	1 µA @ 800 V	5 µA @ 800 V	5 µA @ 1000 V
Capacitance @ Vr, F	16 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	SOD-57, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-55°C ~ 175°C	-65°C ~ 150°C	-55°C ~ 150°C
Technology	Avalanche	Standard	Standard
Product Status	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

HER208G-TP is the primary recommended substitute for new designs and production applications. This part maintains active product status with ROHS3 compliance matching the BY527TAP. The HER208G-TP provides enhanced reverse voltage rating at 1000 V, exceeding the 800 V specification of the main part, while maintaining identical 2 A current capacity. Operating temperature range of -55°C to 150°C aligns with the lower end of the BY527TAP specification. Fast recovery characteristics (75 ns) represent improved switching performance compared to the standard recovery (4 µs) of the main part.

EGP20K is not recommended for new designs due to obsolete product status and RoHS non-compliance. While this part matches the 800 V reverse voltage and 2 A current specifications, its discontinuation from active production and non-compliance with ROHS3 standards make it unsuitable for applications requiring regulatory adherence or long-term supply assurance.

For applications where the BY527TAP avalanche technology is specifically required, no direct substitute with identical avalanche characteristics is available among the listed alternatives. Both substitute parts employ standard diode technology rather than avalanche technology.

Frequently Asked Questions (FAQ)

Q: Can HER208G-TP directly replace BY527TAP in existing designs?

A: HER208G-TP is electrically compatible for applications requiring 800 V reverse voltage and 2 A current capacity. The higher 1000 V rating provides additional voltage margin. Physical package dimensions differ between SOD-57 (BY527TAP) and DO-15 (HER208G-TP), requiring PCB layout verification. Mounting hole spacing and lead diameter must be confirmed for mechanical compatibility.

Q: What is the difference between avalanche and standard diode technology in these parts?

A: The BY527TAP uses avalanche technology, designed to conduct in reverse bias at specified voltage thresholds. EGP20K and HER208G-TP employ standard rectifier diode technology without avalanche characteristics. Applications requiring avalanche breakdown protection must retain the BY527TAP or identify alternative avalanche-rated components.

Q: Why does HER208G-TP have faster recovery time than BY527TAP?

A: HER208G-TP specifies 75 nanosecond reverse recovery time compared to 4 microsecond recovery for BY527TAP. This difference reflects the standard fast-recovery diode design of HER208G-TP versus the standard recovery classification of BY527TAP. Faster recovery reduces switching losses in high-frequency applications but may introduce different transient characteristics in circuit operation.

Q: Is EGP20K suitable for new production?

A: EGP20K is classified as obsolete and does not comply with ROHS3 standards. New designs should not incorporate this part. Existing production using EGP20K should transition to HER208G-TP for regulatory compliance and supply continuity.

Q: What are the package dimension implications when substituting?

A: BY527TAP uses SOD-57 axial package while both substitutes use DO-15 axial package. Although both are axial through-hole configurations, physical dimensions differ. Lead diameter, spacing, and overall length require verification against PCB design specifications. Mechanical fit must be confirmed before implementation.

Q: How do reverse leakage current differences affect circuit performance?

A: BY527TAP specifies 1 µA reverse leakage at 800 V, while both substitutes specify 5 µA. Higher leakage current in substitute parts may impact high-impedance circuit applications or precision analog circuits. Circuit analysis should confirm acceptable leakage levels for the intended application.

Q: Can HER208G-TP be used in applications rated for 800 V if it is rated for 1000 V?

A: Yes. HER208G-TP with 1000 V rating exceeds the 800 V requirement and is suitable for 800 V applications. The higher voltage rating provides design margin for transient overvoltage conditions without degrading performance in nominal 800 V operation.

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