BAY71 Equivalent & Substitute Parts

Part Overview

The BAY71 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 BAY71 serves applications requiring small-signal rectification, switching, and general-purpose diode functions in legacy and new designs requiring compatible alternatives.

Substiute Parts

BAY71

onsemiIn Stock: 716BAY71 Datasheet

Current PartRFQ

1N4454TR

onsemiIn Stock: 164091N4454TR Datasheet

SimilarRFQ

1N4454

Microchip TechnologyIn Stock: 103971N4454 Datasheet

Parametric EquivalentRFQ

BAV18-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 709BAV18-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BAY71 are grouped based on electrical parameter compatibility within the small-signal rectifier diode category. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage - DC Reverse (Vr) (Max): 50 V minimum
• Current - Average Rectified (Io): 200 mA minimum
• Mounting Type: Through Hole
• Package / Case: DO-35 or DO-204AH compatible
• Operating Temperature - Junction: 175°C maximum

Substitution Groups:

Group 1: Direct Electrical Equivalents (50 V, 200 mA)

• 1N4454TR (onsemi) - Active product status, identical electrical ratings
• BAV18-TR (Vishay) - Active product status, higher current rating (250 mA), automotive qualified

Group 2: Parametric Equivalents (Higher Voltage Rating)

• 1N4454 (Microchip Technology) - Active product status, 75 V rating, maintains 200 mA current

Parameter Comparison

Engineering Selection Recommendations

1N4454TR (onsemi)

The 1N4454TR is the primary substitute for the BAY71. This part maintains identical electrical specifications (50 V, 200 mA) and is manufactured by the same supplier (onsemi). The 1N4454TR is in active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Packaging is supplied in Cut Tape (CT) format with 16,300 units in stock, providing procurement security.

1N4454 (Microchip Technology)

The 1N4454 from Microchip Technology is a parametric equivalent offering a higher voltage rating (75 V) while maintaining the 200 mA current specification. This part is active and suitable for applications where increased voltage margin is beneficial. The higher voltage rating does not compromise performance in 50 V applications. RoHS non-compliance status requires verification against project requirements.

BAV18-TR (Vishay General Semiconductor - Diodes Division)

The BAV18-TR is an active substitute with automotive qualification (AEC-Q101) and ROHS3 compliance. This part offers a higher current rating (250 mA) compared to the BAY71 (200 mA), providing additional design margin. The reverse recovery time is 50 ns, which is slower than the BAY71 (4 ns), making this part suitable for applications not requiring fast switching characteristics. Tape & Reel packaging supports automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 1N4454TR directly replace the BAY71 in all applications?

A: Yes. The 1N4454TR maintains identical voltage (50 V) and current (200 mA) ratings, matching the BAY71 electrical specifications. Both parts use the DO-35 through-hole package. The 1N4454TR is in active product status, ensuring long-term availability.

Q: What is the difference between the 1N4454TR and 1N4454 from Microchip?

A: Both parts share the same base part number (1N4454) and maintain 200 mA current rating. The Microchip 1N4454 has a higher voltage rating (75 V versus 50 V). The onsemi 1N4454TR is ROHS3 compliant, while the Microchip version is RoHS non-compliant. For 50 V applications, both are functionally compatible.

Q: Why does the BAV18-TR have a different reverse recovery time?

A: The BAV18-TR is classified as a fast recovery diode (50 ns trr) compared to the BAY71 (4 ns trr). This difference reflects different semiconductor technology and design optimization. The BAV18-TR is suitable for general-purpose rectification applications where fast switching is not critical. Applications requiring the 4 ns recovery time should use the 1N4454TR or 1N4454.

Q: Is the BAV18-TR suitable for automotive applications?

A: Yes. The BAV18-TR carries AEC-Q101 automotive qualification and ROHS3 compliance, making it suitable for automotive-grade designs. The BAY71, 1N4454TR, and Microchip 1N4454 do not carry automotive qualification.

Q: What packaging formats are available for these substitutes?

A: The 1N4454TR is supplied in Cut Tape (CT) format. The BAV18-TR is supplied in Tape & Reel (TR) format. Both formats support automated assembly. The BAY71 and Microchip 1N4454 packaging information is not specified in standard formats, requiring verification with suppliers.

Q: Are all substitute parts RoHS compliant?

A: The 1N4454TR and BAV18-TR are ROHS3 compliant. The Microchip 1N4454 is RoHS non-compliant. Project requirements must determine acceptable compliance levels.

Q: Can I use the 1N4454 (Microchip) in a 50 V application?

A: Yes. The 1N4454 from Microchip is rated for 75 V maximum reverse voltage, which exceeds the 50 V requirement of the BAY71. The higher voltage rating provides additional safety margin without affecting performance in 50 V circuits.