BAY71TR Equivalent & Substitute Parts

Part Overview

The BAY71TR is a general-purpose rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BAY71TR features small-signal switching characteristics with a 4 ns reverse recovery time, suitable for general-purpose rectification and signal detection applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max)	1	V @ 20 mA
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	100	nA @ 35 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	175	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BAY71TR is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 200 mA minimum
Package / Case: DO-35 through-hole configuration
Mounting Type: Through Hole

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Small-signal performance characteristics
Operating Temperature - Junction: 175°C maximum rating
Forward Voltage (Vf): Performance at specified test conditions

Substitute parts are classified into two categories: parametric equivalents (matching all primary criteria) and similar parts (exceeding primary ratings while maintaining package compatibility).

Parameter Comparison

Parameter	BAY71TR (Main)	1N4454TR (Parametric Equivalent)	BAV18-TR (Similar)
Manufacturer	onsemi	onsemi	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	200 mA	200 mA	250 mA
Voltage - Forward (Vf) (Max)	1 V @ 20 mA	1 V @ 10 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	4 ns	4 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 35 V	100 nA @ 50 V	100 nA @ 50 V
Capacitance @ Vr, F	2 pF @ 0V, 1MHz	4 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	175°C	175°C	175°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
Technology	Standard	Standard	Fast Recovery

Engineering Selection Recommendations

1N4454TR - Parametric Equivalent

The 1N4454TR is a direct parametric equivalent to the BAY71TR. Both components share identical voltage and current ratings (50 V, 200 mA), matching reverse recovery time (4 ns), and identical operating temperature maximum (175°C). The 1N4454TR is manufactured by onsemi and maintains active product status, ensuring long-term availability and supply chain continuity. This part is the primary replacement for BAY71TR applications requiring exact electrical performance matching.

BAV18-TR - Similar Substitute

The BAV18-TR is a similar substitute offering enhanced current capacity (250 mA versus 200 mA) while maintaining the 50 V reverse voltage rating and DO-35 package configuration. This part is manufactured by Vishay General Semiconductor and holds active product status with RoHS3 compliance and AEC-Q101 automotive qualification. The BAV18-TR features fast recovery characteristics (50 ns trr) compared to the small-signal performance of the BAY71TR. This part is suitable for applications where increased current margin is beneficial and fast recovery switching is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 1N4454TR directly replace the BAY71TR in all applications?

A: Yes. The 1N4454TR matches all critical electrical parameters of the BAY71TR: 50 V reverse voltage, 200 mA average rectified current, 4 ns reverse recovery time, and 175°C maximum junction temperature. Both components use identical DO-35 through-hole packaging. The 1N4454TR is the parametric equivalent and primary replacement option.

Q: What is the difference between the 1N4454TR and BAV18-TR substitutes?

A: The 1N4454TR is a parametric equivalent matching the BAY71TR exactly across all primary electrical specifications. The BAV18-TR is a similar substitute with higher current capacity (250 mA) and different switching characteristics (50 ns fast recovery versus 4 ns small-signal). Both maintain 50 V reverse voltage and DO-35 packaging. Selection depends on whether exact parameter matching or enhanced current capacity is required.

Q: Are there packaging differences between these diodes?

A: All three parts (BAY71TR, 1N4454TR, and BAV18-TR) use DO-35 through-hole axial packaging (DO-204AH designation). Physical dimensions and lead configurations are identical, allowing direct board-level substitution without layout modifications.

Q: What is the significance of the BAY71TR being obsolete?

A: The BAY71TR is classified as obsolete, meaning onsemi no longer manufactures this component. The 1N4454TR and BAV18-TR are both active products with ongoing manufacturing support, ensuring reliable long-term procurement and supply availability for new designs and legacy system maintenance.

Q: Can the BAV18-TR be used in applications designed for the BAY71TR?

A: The BAV18-TR is compatible with BAY71TR applications from a voltage and package perspective. However, the BAV18-TR features fast recovery switching (50 ns) compared to the BAY71TR's small-signal performance (4 ns). Applications sensitive to reverse recovery time characteristics should use the 1N4454TR for exact performance matching.

Q: What compliance certifications apply to these substitute parts?

A: The 1N4454TR carries RoHS3 compliance. The BAV18-TR carries RoHS3 compliance and AEC-Q101 automotive qualification. All three parts are REACH Unaffected and classified under ECCN EAR99. The BAV18-TR's automotive qualification makes it suitable for automotive and high-reliability applications.

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