BYV37-TR Equivalent & Substitute Parts

Part Overview

The BYV37-TR 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 SOD-57 axial through-hole package. This part is currently active in production. Substitute parts may be required due to packaging preferences, supply chain considerations, or application-specific performance requirements while maintaining electrical compatibility within the 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	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	300	ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	µA
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Through Hole	-
Package / Case	SOD-57, Axial	-
Technology	Avalanche	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the BYV37-TR are qualified based on the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 800 V
Current - Average Rectified (Io): Equal to 2 A
Mounting Type: Through Hole
Speed Classification: Fast Recovery (≤ 500 ns, > 200 mA)
Reverse Recovery Time (trr): ≤ 500 ns
Current - Reverse Leakage @ Vr: ≤ 5 µA at rated voltage

Secondary Considerations:

Package / Case: SOD-57 (primary), DO-15 (alternative with different form factor)
Operating Temperature Range: Minimum -55°C junction temperature
RoHS Compliance: ROHS3 preferred for regulatory alignment

The substitute parts listed below meet the electrical requirements for direct functional replacement while accommodating different packaging and technology approaches.

Parameter Comparison

Parameter	BYV37-TR (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	1.1 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
Operating Temperature - Junction	-55 to 175°C	-65 to 150°C	-55 to 150°C
Package / Case	SOD-57, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Technology	Avalanche	Standard	Standard
Product Status	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

BYV37-TR (Primary Selection)

Active product status with continuous manufacturing support
ROHS3 compliant for regulatory requirements
Avalanche technology with optimized forward voltage characteristics (1.1 V @ 1 A)
Extended junction temperature range (-55 to 175°C) for high-temperature applications
SOD-57 package provides compact axial form factor

HER208G-TP (Preferred Substitute)

Active product status ensures supply chain continuity
ROHS3 compliant for regulatory alignment
Higher voltage rating (1000 V) provides additional design margin above 800 V requirement
Faster reverse recovery time (75 ns vs. 300 ns) reduces switching losses
DO-15 package is widely available and compatible with through-hole PCB layouts
Operating temperature range (-55 to 150°C) covers most industrial applications

EGP20K (Alternative Substitute)

Obsolete product status limits long-term availability
RoHS non-compliant; not suitable for new designs requiring regulatory compliance
Equivalent voltage and current ratings to BYV37-TR
Faster reverse recovery time (75 ns) compared to main part
DO-15 package form factor differs from SOD-57

Frequently Asked Questions (FAQ)

Q: Can HER208G-TP directly replace BYV37-TR in existing designs?

A: HER208G-TP meets all electrical requirements for functional replacement. The primary difference is package form factor: HER208G-TP uses DO-15 (larger diameter) versus BYV37-TR SOD-57 (smaller diameter). PCB layout modifications may be required to accommodate the different package dimensions. Electrical performance is compatible.

Q: What is the significance of the 1000 V rating on HER208G-TP versus 800 V on BYV37-TR?

A: HER208G-TP's higher voltage rating (1000 V) exceeds the 800 V requirement of BYV37-TR. This provides additional safety margin in applications with voltage transients or overvoltage conditions. The part remains fully functional at 800 V operation.

Q: Why is EGP20K listed as obsolete?

A: EGP20K is marked as obsolete by the manufacturer. While electrically compatible, obsolete parts present supply chain risk and are not recommended for new designs. HER208G-TP is the preferred active substitute.

Q: How do forward voltage differences affect circuit performance?

A: BYV37-TR specifies 1.1 V @ 1 A forward voltage, while both substitutes specify 1.7 V @ 2 A. Forward voltage affects power dissipation and heat generation. In applications with significant forward current, the higher forward voltage of substitutes results in increased power loss. Circuit thermal analysis should account for this difference.

Q: What is the impact of reverse recovery time differences?

A: BYV37-TR has 300 ns reverse recovery time; substitutes have 75 ns. Faster recovery reduces switching losses and electromagnetic interference in high-frequency applications. For low-frequency rectification, this difference has minimal impact.

Q: Are there RoHS compliance implications for part selection?

A: BYV37-TR and HER208G-TP are both ROHS3 compliant. EGP20K is RoHS non-compliant and unsuitable for applications requiring regulatory compliance. New designs should use ROHS3 compliant parts.

Q: What are the temperature range considerations?

A: BYV37-TR operates to 175°C junction temperature, while substitutes are limited to 150°C. For applications requiring operation above 150°C, BYV37-TR is the only suitable option. For standard industrial temperature ranges, all parts are compatible.

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