FDH333TR Equivalent & Substitute Parts

Part Overview

The FDH333TR is a general-purpose rectifier diode manufactured by onsemi, rated for 125 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This component is classified as a small-signal diode with standard switching speed characteristics and is currently active in production status. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining compatible physical packaging and thermal ratings.

Substiute Parts

FDH333TR

onsemiIn Stock: 168643FDH333TR Datasheet

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1N4448

Microchip TechnologyIn Stock: 502361N4448 Datasheet

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BAV20,113

Nexperia USA Inc.In Stock: 40387BAV20,113 Datasheet

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BAV20,133

NXP USA Inc.In Stock: 223101BAV20,133 Datasheet

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BAV20,143

Nexperia USA Inc.In Stock: 5583BAV20,143 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDH333TR are grouped based on electrical parameter compatibility within the following criteria:

Primary Substitution Parameters:

• Voltage - DC Reverse (Vr) rating must equal or exceed 125 V
• Current - Average Rectified (Io) must equal or exceed 200 mA
• Package / Case must be DO-35 or equivalent axial through-hole configuration
• Mounting Type must be Through Hole
• Operating Temperature - Junction must support 175°C or higher

Substitution Groups:

Group 1: Direct Electrical Equivalents (Higher Voltage/Current Rating) Parts BAV20,113, BAV20,133, and BAV20,143 provide higher voltage (150 V) and current (250 mA) ratings with identical through-hole mounting and superior thermal characteristics (175°C max junction temperature). These parts are rated for fast recovery operation and maintain ROHS3 compliance.

Group 2: Reduced Voltage Rating Part 1N4448 operates at 75 V maximum reverse voltage, which is below the FDH333TR specification of 125 V. This part is included in the substitute list but represents a downgrade in voltage capability and is discontinued at DiGi Electronics with non-compliant RoHS status.

Parameter Comparison

Engineering Selection Recommendations

Recommended Substitutes (Active Production, ROHS3 Compliant):

The BAV20 series parts (BAV20,113, BAV20,133, BAV20,143) are the primary substitutes for FDH333TR. All three variants meet or exceed the electrical specifications of the FDH333TR while maintaining active production status and ROHS3 compliance. These parts provide higher voltage and current ratings, enabling use in applications requiring additional design margin. The BAV20 series operates with fast recovery characteristics and maintains identical through-hole DO-35 packaging.

Conditional Substitute (Discontinued, Non-Compliant):

The 1N4448 is listed as a substitute but operates at 75 V maximum reverse voltage, which is insufficient for applications requiring the full 125 V rating of the FDH333TR. This part is discontinued at DiGi Electronics and does not meet ROHS3 compliance requirements. Selection of 1N4448 is appropriate only for applications with voltage requirements below 75 V and where RoHS compliance is not mandated.

Selection Criteria:

• For new designs and applications requiring ROHS3 compliance: select BAV20,113, BAV20,133, or BAV20,143
• For applications with voltage requirements below 75 V and legacy system support: 1N4448 may be considered if RoHS compliance is not required
• All recommended substitutes maintain through-hole mounting compatibility and DO-35 package configuration

Frequently Asked Questions (FAQ)

Q: Can BAV20,113, BAV20,133, or BAV20,143 be used as direct replacements for FDH333TR?

A: Yes. The BAV20 series parts provide equal or superior electrical performance across all critical parameters. The higher voltage rating (150 V vs. 125 V) and current capacity (250 mA vs. 200 mA) ensure compatibility in applications designed for FDH333TR. All three variants share identical electrical specifications and through-hole DO-35 packaging.

Q: What is the difference between BAV20,113, BAV20,133, and BAV20,143?

A: These three part numbers represent the same electrical component with different packaging configurations. BAV20,113 and BAV20,143 are supplied in Cut Tape (CT) packaging, while BAV20,133 is supplied in Bulk packaging. Electrical performance and physical package dimensions are identical across all three variants.

Q: Is 1N4448 a suitable substitute for FDH333TR?

A: 1N4448 is not suitable for applications requiring the full 125 V reverse voltage rating of FDH333TR. The 1N4448 is rated for 75 V maximum, representing a 50 V reduction in voltage capability. Additionally, 1N4448 is discontinued at DiGi Electronics and does not meet ROHS3 compliance. This part is appropriate only for applications with voltage requirements below 75 V where RoHS compliance is not required.

Q: Are there any thermal considerations when substituting with BAV20 series parts?

A: No thermal derating is required. The BAV20 series maintains the same maximum junction temperature rating (175°C) as the FDH333TR. Both component families are rated for identical thermal operating ranges.

Q: Do all substitute parts use the same DO-35 package?

A: Yes. All substitute parts listed (BAV20,113, BAV20,133, BAV20,143, and 1N4448) use the DO-204AH/DO-35 axial through-hole package configuration. Physical dimensions and PCB footprints are compatible with FDH333TR applications.

Q: What is the inventory status of substitute parts?

A: BAV20,113 has 40,300 units in stock, BAV20,133 has 223,049 units in stock, and BAV20,143 has 5,551 units in stock. The 1N4448 has 50,170 units in stock but is discontinued at DiGi Electronics. For new designs, BAV20 series parts are recommended due to active production status.

Q: Are all substitute parts ROHS3 compliant?

A: BAV20,113 and BAV20,143 are ROHS3 compliant. BAV20,133 RoHS status is not specified in available documentation. The 1N4448 is non-compliant with RoHS requirements. For applications requiring ROHS3 compliance, BAV20,113 or BAV20,143 are the appropriate selections.