FDH300ATR Equivalent & Substitute Parts

Part Overview

The FDH300ATR 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.

Equivalent and substitute parts are identified when circuit designs require component sourcing alternatives due to inventory constraints, supply chain considerations, or packaging format preferences while maintaining functional compatibility within specified electrical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	125	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	V
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Current - Reverse Leakage @ Vr	1	nA @ 125 V
Capacitance @ Vr, F	6	pF @ 0V, 1MHz
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FDH300ATR are classified into two categories based on electrical parameter alignment:

Direct Parametric Equivalents: Parts that match or exceed the FDH300ATR across all critical electrical specifications—specifically voltage rating (125 V minimum), current rating (200 mA minimum), forward voltage characteristics, and thermal operating range (175°C maximum junction temperature). These parts maintain identical or superior performance in the same application circuit without derating.

Similar Functional Alternatives: Parts that operate within the same general-purpose rectifier category but with variations in one or more parameters. These parts are suitable for substitution when circuit design margins accommodate parameter differences, such as higher voltage ratings, increased current capacity, or different packaging formats.

The following parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 125 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Mounting Type: Through Hole (required for mechanical compatibility)
Package / Case: DO-35 or equivalent axial configuration
Operating Temperature - Junction: Must support 175°C maximum

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	Package	Tj (Max) [°C]	RoHS Status	Product Status
FDH300ATR	onsemi	125	200	1 @ 200 mA	DO-35	175	ROHS3 Compliant	Active
FDH300TR	onsemi	125	200	1 @ 200 mA	DO-35	175	ROHS3 Compliant	Active
BAY72TR	Fairchild Semiconductor	125	200	1 @ 100 mA	DO-35	175	Not specified	Active
BAV20,113	Nexperia USA Inc.	150	250	1.25 @ 200 mA	ALF2	175	ROHS3 Compliant	Active
BAV20,133	NXP USA Inc.	150	250	1.25 @ 200 mA	ALF2	175	Not specified	Active
BAV20,143	Nexperia USA Inc.	150	250	1.25 @ 200 mA	ALF2	175	ROHS3 Compliant	Active
1N4448	Microchip Technology	75	200	1 @ 100 mA	DO-35	150	RoHS non-compliant	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

FDH300TR is the direct equivalent to FDH300ATR. Both parts are manufactured by onsemi with identical electrical specifications, thermal ratings, and RoHS3 compliance. The FDH300TR differs only in packaging format (Cut Tape versus the original specification) and represents a functionally interchangeable substitute with no circuit redesign required.

Parametric Equivalents (Meets or Exceeds Specifications):

BAY72TR (Fairchild Semiconductor) meets the core electrical requirements with matching voltage and current ratings and identical thermal operating range. This part is suitable for direct substitution in applications where forward voltage characteristics at 100 mA operation are acceptable.

BAV20,113, BAV20,133, and BAV20,143 provide enhanced electrical performance with higher voltage ratings (150 V) and increased current capacity (250 mA). These parts are suitable for substitution in circuits with design margins that accommodate higher forward voltage (1.25 V at 200 mA) and different package geometry (ALF2 format). All three BAV20 variants are active products with ROHS3 compliance (BAV20,113 and BAV20,143 confirmed).

Not Recommended for Direct Substitution:

1N4448 (Microchip Technology) does not meet substitution criteria. The voltage rating of 75 V is below the required 125 V specification, and the product is discontinued at DiGi Electronics. Additionally, RoHS non-compliance and reduced maximum junction temperature (150°C) further disqualify this part from equivalent status.

Frequently Asked Questions (FAQ)

Q: Can FDH300TR be used as a direct replacement for FDH300ATR?

A: Yes. FDH300TR is manufactured by onsemi with identical electrical specifications, thermal ratings, and compliance certifications. The only difference is packaging format (Cut Tape). No circuit modifications are required.

Q: Are the BAV20 series diodes (BAV20,113, BAV20,133, BAV20,143) suitable substitutes?

A: The BAV20 series parts exceed the FDH300ATR specifications in voltage (150 V vs. 125 V) and current (250 mA vs. 200 mA) ratings. They are suitable substitutes for applications where the circuit design accommodates higher forward voltage (1.25 V at 200 mA) and the ALF2 package geometry is mechanically compatible. All three variants are active products.

Q: Why is 1N4448 not recommended as a substitute?

A: The 1N4448 has a maximum reverse voltage rating of 75 V, which is below the required 125 V specification. Additionally, this part is discontinued at DiGi Electronics, has RoHS non-compliance status, and a reduced maximum junction temperature of 150°C compared to the 175°C requirement.

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

A: All three parts have identical electrical specifications. The differences are in manufacturer designation (Nexperia USA Inc. for BAV20,113 and BAV20,143; NXP USA Inc. for BAV20,133) and packaging format (Cut Tape for BAV20,113 and BAV20,143; Bulk for BAV20,133). BAV20,113 and BAV20,143 are ROHS3 compliant.

Q: Can BAY72TR be used in place of FDH300ATR?

A: Yes. BAY72TR meets the core electrical requirements with matching 125 V voltage rating, 200 mA current rating, and 175°C maximum junction temperature. The forward voltage specification differs at the 100 mA test point, but both parts are rated for 1 V maximum forward voltage at their respective test currents.

Q: What packaging considerations apply to substitute parts?

A: FDH300ATR and FDH300TR use DO-35 (DO-204AH) axial packages. BAV20 series parts use ALF2 package format, which is also a through-hole axial configuration but with different physical dimensions. Mechanical compatibility with PCB footprints must be verified before substitution. BAY72TR uses DO-35 packaging, matching the original part.

Q: Are all substitute parts RoHS compliant?

A: FDH300ATR, FDH300TR, BAV20,113, and BAV20,143 are ROHS3 compliant. BAY72TR and BAV20,133 do not have specified RoHS status in the provided data. 1N4448 is RoHS non-compliant and should not be used in applications requiring RoHS compliance.

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