BYV37-TAP Equivalent & Substitute Parts

Part Overview

The BYV37-TAP is an avalanche diode rated for 800 V DC reverse voltage and 2 A average rectified current, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component features fast recovery characteristics with a reverse recovery time of 300 ns and operates across a junction temperature range of -55°C to 175°C. The device is packaged in SOD-57 axial configuration and maintains active product status with full RoHS3 compliance.

Substitute parts become necessary when the BYV37-TAP reaches end-of-life status, when alternative packaging formats are required for manufacturing compatibility, or when design specifications permit operation with equivalent electrical parameters. The substitute parts listed maintain the core electrical ratings while offering different package configurations and recovery characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	300	ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	µA
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

Substitution eligibility for the BYV37-TAP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 2 A
Mounting Type: Through Hole
Speed Classification: Fast Recovery (≤ 500 ns, > 200 mA)

Acceptable Variation Parameters:

Package / Case: Alternative through-hole axial packages (SOD-57, DO-15, DO-204AC)
Reverse Recovery Time (trr): May vary within fast recovery classification
Forward Voltage (Vf): Acceptable within standard rectifier specifications
Operating Temperature Range: May be narrower than original specification
Technology: Avalanche or Standard rectifier technology
Product Status: Active or Obsolete status does not preclude substitution if electrical parameters align

The substitute parts EGP20K and HER208G-TP both satisfy the mandatory electrical parameters while offering different package configurations and recovery characteristics suitable for alternative circuit board layouts.

Parameter Comparison

Parameter	BYV37-TAP	EGP20K	HER208G-TP
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	1.1 V @ 1 A	1.7 V @ 2 A	1.7 V @ 2 A
Reverse Recovery Time (trr)	300 ns	75 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 1000 V
Package / Case	SOD-57, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-55°C to 175°C	-65°C to 150°C	-55°C to 150°C
Technology	Avalanche	Standard	Standard
Product Status	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

BYV37-TAP (Primary Selection)

The BYV37-TAP remains the preferred component for new designs and production continuity. It maintains active product status, full RoHS3 compliance, and unlimited moisture sensitivity level (MSL 1). The avalanche technology provides inherent overvoltage protection characteristics. The extended junction temperature range (-55°C to 175°C) accommodates demanding thermal environments. This component is recommended for applications requiring avalanche diode functionality and maximum regulatory compliance.

HER208G-TP (Preferred Substitute)

The HER208G-TP serves as the primary substitute when package format compatibility requires DO-15 configuration or when higher reverse voltage rating (1000 V) provides design margin. This component maintains active product status and ROHS3 compliance. The faster reverse recovery time (75 ns versus 300 ns) reduces switching losses in high-frequency applications. The DO-15 package offers superior space efficiency compared to SOD-57. Selection of HER208G-TP is appropriate for designs permitting standard rectifier technology and DO-15 package geometry.

EGP20K (Secondary Substitute)

The EGP20K provides electrical equivalence at the 800 V / 2 A rating with identical reverse leakage characteristics. However, this component carries obsolete product status and RoHS non-compliance, restricting its use to legacy system maintenance or applications where regulatory compliance is not required. The EGP20K is not recommended for new designs or production systems subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can HER208G-TP replace BYV37-TAP in all applications?

A: HER208G-TP satisfies the mandatory electrical parameters (800 V minimum reverse voltage, 2 A current rating, fast recovery classification). The primary consideration is package geometry: HER208G-TP uses DO-15 configuration while BYV37-TAP uses SOD-57. Circuit board layout and lead spacing must accommodate the DO-15 package. The higher reverse voltage rating (1000 V) of HER208G-TP provides additional design margin without performance degradation.

Q: What is the significance of the 300 ns versus 75 ns reverse recovery time difference?

A: Both components meet the fast recovery classification (≤ 500 ns). The BYV37-TAP recovery time of 300 ns is suitable for standard rectification and power supply applications. The HER208G-TP recovery time of 75 ns reduces switching losses and electromagnetic interference in high-frequency switching circuits. Selection depends on application frequency requirements, not substitution eligibility.

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

A: EGP20K maintains electrical equivalence at the core ratings (800 V, 2 A, fast recovery). Obsolete status indicates discontinued manufacturing, not functional incompatibility. EGP20K remains suitable for legacy system repairs where existing inventory exists. New designs and production systems should not select EGP20K due to unavailability and RoHS non-compliance.

Q: Does the forward voltage difference (1.1 V versus 1.7 V) affect substitution?

A: Forward voltage differences are acceptable within rectifier diode specifications. The BYV37-TAP forward voltage of 1.1 V @ 1 A reflects avalanche technology characteristics. The substitute parts at 1.7 V @ 2 A represent standard rectifier performance. Circuit designs must account for forward voltage in power dissipation calculations, but this difference does not preclude substitution if thermal design accommodates the higher dissipation.

Q: What packaging considerations apply when switching from SOD-57 to DO-15?

A: SOD-57 and DO-15 are both axial through-hole packages with different physical dimensions. DO-15 typically offers more compact form factor. Circuit board hole spacing, lead length requirements, and component density must be verified before substitution. Both packages are suitable for wave soldering and manual assembly processes.

Q: Is the operating temperature range difference significant?

A: The BYV37-TAP range (-55°C to 175°C) exceeds both substitutes. HER208G-TP (-55°C to 150°C) matches the lower limit but reduces maximum junction temperature by 25°C. EGP20K (-65°C to 150°C) extends the lower limit but also reduces maximum temperature. Substitution is acceptable if the application operates within the substitute part's temperature range. High-temperature applications (above 150°C) require the BYV37-TAP.

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