BAY73_T50R Equivalent & Substitute Parts

Part Overview

The BAY73_T50R is a general-purpose rectifier diode manufactured by onsemi, rated for 125 V DC reverse voltage and 500 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BAY73_T50R operates with standard recovery characteristics and is suitable for general rectification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	125	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	V
Reverse Recovery Time (trr)	1	µs
Current - Reverse Leakage @ Vr	5 nA @ 100 V	nA
Capacitance @ Vr, F	8	pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	175	°C
Package / Case	DO-204AH, DO-35, Axial	-
Mounting Type	Through Hole	-
Technology	Standard	-

Substitute Part Grouping Explanation

Substitution of the BAY73_T50R is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage Rating (Vr): The substitute part must support the application's reverse voltage requirement. The BAY73_T50R operates at 125 V maximum. Substitute parts with equal or higher voltage ratings are electrically compatible for this parameter.

Current Rating (Io): The substitute part must support the application's average rectified current requirement. The BAY73_T50R is rated for 500 mA. Substitute parts with equal or higher current ratings are electrically compatible for this parameter.

Package and Mounting: All substitute parts must use the DO-35 through-hole package (DO-204AH designation) to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Recovery Characteristics: The BAY73_T50R employs standard recovery characteristics (>500 ns, >200 mA). Substitute parts must maintain compatible recovery speed classifications to preserve circuit performance.

Operating Temperature: The BAY73_T50R operates to a maximum junction temperature of 175°C. Substitute parts must support this thermal range or higher.

The following substitute parts are listed based on these criteria:

1N458ATR (Fairchild Semiconductor): Meets or exceeds all critical parameters with 150 V reverse voltage, 500 mA current rating, and active product status.

1N4448 (Microchip Technology): Provides reduced voltage (75 V) and current (200 mA) ratings, suitable only for applications with lower electrical requirements than the original specification.

1N5196 (Microchip Technology): Provides elevated voltage rating (225 V) with reduced current (200 mA), suitable for applications requiring higher voltage tolerance with lower current demands.

Parameter Comparison

Parameter	BAY73_T50R (Main)	1N458ATR	1N4448	1N5196
Manufacturer	onsemi	Fairchild Semiconductor	Microchip Technology	Microchip Technology
Voltage - DC Reverse (Vr) (Max)	125 V	150 V	75 V	225 V
Current - Average Rectified (Io)	500 mA	500 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	1 V @ 100 mA	1 V @ 100 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	1 µs	-	4 ns	-
Current - Reverse Leakage @ Vr	5 nA @ 100 V	25 µA @ 125 V	25 nA @ 20 V	25 nA @ 225 V
Operating Temperature - Junction	175°C (Max)	175°C (Max)	-65°C ~ 150°C	-65°C ~ 175°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active
Technology	Standard	Standard	Small Signal	Small Signal

Engineering Selection Recommendations

1N458ATR (Recommended Primary Substitute): This part is the optimal substitute for the BAY73_T50R. It maintains active product status with established supply chain availability. The 1N458ATR meets or exceeds all critical electrical parameters: 150 V reverse voltage (exceeds 125 V requirement), 500 mA current rating (matches requirement), and 175°C maximum junction temperature (matches requirement). The DO-35 package ensures direct mechanical compatibility. This part is suitable for direct replacement in applications requiring the full electrical specification of the original BAY73_T50R.

1N5196 (Secondary Substitute for Elevated Voltage Applications): This part is suitable for applications where the original 125 V specification can be exceeded without circuit modification. The 1N5196 provides 225 V reverse voltage rating with active product status and established supply availability. However, the reduced current rating of 200 mA limits this substitute to applications with lower current demands than the original 500 mA specification. The DO-35 package ensures mechanical compatibility.

1N4448 (Limited Substitution for Reduced Specification Applications): This part is suitable only for applications with reduced electrical requirements. The 75 V reverse voltage and 200 mA current ratings are both lower than the original BAY73_T50R specification. Product status is discontinued at DiGi Electronics, indicating limited future availability. The DO-35 package ensures mechanical compatibility. This substitute is not recommended for new designs or applications requiring the full original specification.

Frequently Asked Questions (FAQ)

Q: Can the 1N458ATR directly replace the BAY73_T50R in all applications?

A: The 1N458ATR is electrically and mechanically compatible with the BAY73_T50R for direct replacement. Both parts share the DO-35 package, 500 mA current rating, and 175°C maximum junction temperature. The 1N458ATR provides higher reverse voltage (150 V versus 125 V), which does not create compatibility issues in applications designed for the original 125 V specification.

Q: What are the limitations of using the 1N4448 as a substitute?

A: The 1N4448 has reduced electrical ratings compared to the BAY73_T50R: 75 V reverse voltage (versus 125 V) and 200 mA current (versus 500 mA). This substitute is suitable only for applications with lower voltage and current requirements. Additionally, the 1N4448 is discontinued at DiGi Electronics, limiting future procurement options. The maximum junction temperature of 150°C is also lower than the original 175°C specification.

Q: When should the 1N5196 be selected over the 1N458ATR?

A: The 1N5196 should be selected when the application requires reverse voltage ratings exceeding 125 V, up to 225 V. However, the reduced current rating of 200 mA limits this substitute to applications with lower current demands than the original 500 mA specification. Both parts use the DO-35 package and maintain active product status.

Q: Are all substitute parts available in the same DO-35 package?

A: Yes. All substitute parts listed (1N458ATR, 1N4448, and 1N5196) use the DO-35 through-hole package (DO-204AH designation). This ensures mechanical compatibility with existing PCB layouts and assembly processes designed for the BAY73_T50R.

Q: What is the significance of the BAY73_T50R being classified as obsolete?

A: Obsolete status indicates that the BAY73_T50R is no longer manufactured or supported by onsemi. Substitute parts with active or recently discontinued status provide better long-term supply chain reliability and design continuity for ongoing production and maintenance applications.

Q: How do the recovery characteristics differ between substitute options?

A: The BAY73_T50R and 1N458ATR both employ standard recovery characteristics (>500 ns, >200 mA). The 1N4448 and 1N5196 are classified as small-signal diodes with faster recovery times (4 ns for 1N4448). Recovery time differences may affect circuit performance in high-frequency or switching applications; however, all parts are compatible with standard rectification circuits.

Q: What compliance certifications are maintained across all substitute parts?

A: All parts listed (BAY73_T50R, 1N458ATR, 1N4448, and 1N5196) share REACH Unaffected status and EAR99 ECCN classification. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

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