BAS34-TR Equivalent & Substitute Parts

Part Overview

The BAS34-TR is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 60 V DC reverse voltage and 200 mA average rectified current in a DO-35 (DO-204AH) axial through-hole package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs. The BAS34-TR carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant.

Substiute Parts

BAS34-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 770BAS34-TR Datasheet

Current PartRFQ

BAS34-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 79561BAS34-TAP Datasheet

Parametric EquivalentRFQ

1N457

Fairchild SemiconductorIn Stock: 108821N457 Datasheet

MFR RecommendedRFQ

1N457A

Microchip TechnologyIn Stock: 11711N457A Datasheet

MFR RecommendedRFQ

1N457TR

Fairchild SemiconductorIn Stock: 309251N457TR Datasheet

MFR RecommendedRFQ

1N483B

Microchip TechnologyIn Stock: 9771N483B Datasheet

MFR RecommendedRFQ

1N5194

Microchip TechnologyIn Stock: 9831N5194 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BAS34-TR is determined by electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) rating must equal or exceed 60 V
• Current - Average Rectified (Io) must equal or exceed 200 mA
• Package / Case must be DO-35 (DO-204AH) axial through-hole configuration
• Mounting Type must be Through Hole
• Operating Temperature - Junction must support 175°C maximum

Secondary Compatibility Factors:

• Forward voltage characteristics at specified test conditions
• Reverse leakage current performance
• Capacitance specifications at rated voltage and frequency
• Compliance certifications (AEC-Q101, RoHS status)

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications and packaging) and Manufacturer Recommended Alternatives (equal or superior electrical ratings with compatible packaging).

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitute: BAS34-TAP

The BAS34-TAP is the optimal direct replacement for the obsolete BAS34-TR. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 60 V reverse voltage, 200 mA average rectified current, and 1 V forward voltage at 100 mA. Both maintain automotive-grade qualification (AEC-Q101) and RoHS3 compliance. The sole difference is packaging format: BAS34-TAP is supplied in Cut Tape (CT) rather than Tape & Reel (TR). This part is currently active with substantial inventory availability (79,536 pieces).

Recommended Secondary Substitutes: 1N457TR and 1N457

The 1N457TR (Fairchild Semiconductor) and 1N457 (Fairchild Semiconductor) provide superior electrical performance with 70 V reverse voltage rating and 200 mA average rectified current. Both are active products with adequate inventory. These parts feature lower reverse leakage current (25 nA @ 60 V) compared to the BAS34-TR (1 nA @ 30 V) and maintain the same DO-35 axial through-hole package. Maximum junction temperature is 175°C, matching the original specification. Selection between 1N457TR and 1N457 depends on packaging requirements; both are functionally equivalent.

Alternative Substitute: 1N5194

The 1N5194 (Microchip Technology) offers 70 V reverse voltage and 200 mA average rectified current in DO-35 axial through-hole packaging. This part provides low reverse leakage current (25 nA @ 70 V) and supports 175°C maximum junction temperature. However, RoHS compliance status differs from the original BAS34-TR.

Not Recommended: 1N457A

The 1N457A (Microchip Technology) has reduced average rectified current rating (150 mA versus 200 mA required) and lower maximum junction temperature (150°C versus 175°C). This part does not meet the current specification of the BAS34-TR and is not suitable for direct substitution.

Not Recommended: 1N483B

The 1N483B (Microchip Technology) uses DO-7 (DO-204AA) axial through-hole packaging, which is physically incompatible with the DO-35 (DO-204AH) footprint of the BAS34-TR. Additionally, reverse leakage current is significantly elevated (100 µA @ 70 V).

Frequently Asked Questions (FAQ)

Q: Can the BAS34-TAP directly replace the BAS34-TR in existing designs?

A: Yes. The BAS34-TAP is electrically and mechanically identical to the BAS34-TR. Both components have 60 V reverse voltage, 200 mA average rectified current, identical forward voltage characteristics, and the same DO-35 axial through-hole package. The only difference is the packaging format (Cut Tape versus Tape & Reel), which does not affect circuit performance. Both maintain AEC-Q101 automotive qualification and RoHS3 compliance.

Q: What is the advantage of using 1N457TR or 1N457 instead of BAS34-TAP?

A: The 1N457TR and 1N457 provide a higher reverse voltage rating (70 V versus 60 V), offering additional design margin in applications where voltage transients or overvoltage conditions may occur. Both parts maintain 200 mA average rectified current and the same DO-35 package. The lower reverse leakage current (25 nA @ 60 V) may provide improved performance in high-impedance circuits. These parts are suitable for designs requiring enhanced voltage headroom.

Q: Why is 1N457A not recommended as a substitute?

A: The 1N457A has two critical limitations: reduced average rectified current (150 mA versus 200 mA) and lower maximum junction temperature (150°C versus 175°C). These specifications do not meet the electrical requirements of the BAS34-TR. Use of this part would compromise circuit performance and reliability in applications requiring full 200 mA current capacity or operation near 175°C.

Q: Can 1N483B be used as a substitute?

A: No. The 1N483B uses DO-7 (DO-204AA) axial through-hole packaging, which is physically incompatible with the DO-35 (DO-204AH) footprint of the BAS34-TR. PCB layout and component mounting cannot accommodate this package variant. Additionally, the reverse leakage current specification (100 µA @ 70 V) is significantly higher than the BAS34-TR, which may cause performance degradation in sensitive applications.

Q: What packaging formats are available for BAS34 equivalent diodes?

A: The BAS34 base product is available in multiple packaging formats: Tape & Reel (TR) as the original BAS34-TR, and Cut Tape (CT) as the BAS34-TAP. Both use DO-35 (DO-204AH) axial through-hole packages. Selection between these formats depends on procurement and assembly requirements; electrical performance is identical.

Q: Are all substitute parts automotive-qualified?

A: No. Only the BAS34-TR and BAS34-TAP carry AEC-Q101 automotive qualification. The 1N457, 1N457A, 1N457TR, 1N483B, and 1N5194 do not have documented automotive qualification. For applications requiring automotive-grade components, the BAS34-TAP is the only active substitute that maintains AEC-Q101 certification.

Q: What is the difference between 1N457 and 1N457TR?

A: The 1N457 and 1N457TR are electrically identical, both manufactured by Fairchild Semiconductor with 70 V reverse voltage and 200 mA average rectified current. The designation difference reflects packaging format or supplier variation. Both are suitable for direct substitution in applications where the higher 70 V rating is acceptable.

Q: Does RoHS compliance status affect substitution decisions?

A: RoHS compliance status should be evaluated based on application requirements and regulatory jurisdiction. The BAS34-TR and BAS34-TAP are RoHS3 compliant. The 1N457A, 1N483B, and 1N5194 are RoHS non-compliant. For applications subject to RoHS regulations, use of non-compliant parts may not be permitted. The 1N457 and 1N457TR do not have documented RoHS status in the provided specifications.