DSF10TC Equivalent & Substitute Parts

Part Overview

The DSF10TC is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 1 A average rectified current in a DO-204AL (DO-41) axial through-hole package. This part is classified as obsolete, indicating it is no longer in active production. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for repair, maintenance, and new production applications where the original specification can be met by alternative manufacturers' offerings.

Key Parameters

Parameter	DSF10TC Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction (Max)	150	°C

Substitute Part Grouping Explanation

Substitute parts for the DSF10TC are selected based on strict electrical and mechanical compatibility criteria. All substitute candidates must meet or exceed the following parameters:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial compatible

Substitutes are grouped into two categories:

Direct Substitutes (Electrical Equivalents): Parts with identical or superior voltage and current ratings, standard recovery characteristics, and compatible through-hole axial packaging. These parts maintain the same functional performance envelope as the DSF10TC.

Similar Substitutes (Enhanced Performance): Parts with identical voltage and current ratings but featuring fast recovery characteristics (≤500 ns) or improved temperature ranges. These parts provide equivalent or superior electrical performance and are suitable for applications where the original specification can be met.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (V)	Speed	Reverse Leakage @ Vr (µA)	Package	Product Status
DSF10TC	onsemi	200	1	1.0	Standard Recovery >500ns	10 @ 200V	DO-204AL	Obsolete
1N4003G	Taiwan Semiconductor Corporation	200	1	1.0	Standard Recovery >500ns	5 @ 200V	DO-204AL	Active
1N4935G	Taiwan Semiconductor Corporation	200	1	1.2	Fast Recovery ≤500ns	5 @ 200V	DO-204AL	Active
EGP10D	Fairchild Semiconductor	200	1	0.95	Fast Recovery ≤500ns	5 @ 200V	DO-204AL	Active
RGP10D	Fairchild Semiconductor	200	1	1.3	Fast Recovery ≤500ns	5 @ 200V	DO-204AL	Active
UF4003	Diotec Semiconductor	200	1	1.0	Fast Recovery ≤500ns	5 @ 200V	DO-204AC	Active
1N3611	Microchip Technology	200	1	1.1	Standard Recovery >500ns	1 @ 200V	Axial	Active
1N4003-E3/53	Vishay General Semiconductor - Diodes Division	200	1	1.1	Standard Recovery >500ns	5 @ 200V	DO-204AL	Active
1N4003-E3/73	Vishay General Semiconductor - Diodes Division	200	1	1.1	Standard Recovery >500ns	5 @ 200V	DO-204AL	Active
1N4003-T	Diodes Incorporated	200	1	1.0	Standard Recovery >500ns	5 @ 200V	DO-41	Last Time Buy
1N4003-TP	Micro Commercial Co	200	1	1.1	Standard Recovery >500ns	5 @ 200V	DO-41	Not For New Designs

Engineering Selection Recommendations

Primary Substitutes for Active Production:

1N4003G (Taiwan Semiconductor Corporation) — Recommended as the primary direct substitute. Maintains standard recovery characteristics identical to DSF10TC, features lower reverse leakage current (5 µA vs. 10 µA), and is in active production status with ROHS3 compliance. Electrical performance is equivalent with improved leakage characteristics.
1N4003-E3/53 and 1N4003-E3/73 (Vishay General Semiconductor - Diodes Division) — Functionally equivalent direct substitutes in active production. Both variants meet identical electrical specifications with standard recovery characteristics and ROHS3 compliance. Packaging is DO-204AL (DO-41) compatible.
1N4003-T (Diodes Incorporated) — Suitable substitute with equivalent electrical performance and standard recovery characteristics. Product status is Last Time Buy; use for existing designs where component continuity is established.

Secondary Substitutes with Enhanced Performance:

EGP10D (Fairchild Semiconductor) — Fast recovery rectifier with superior forward voltage (0.95 V) and active production status. Suitable for applications where improved switching performance is beneficial.
RGP10D (Fairchild Semiconductor) — Fast recovery alternative with extended operating temperature range (-65°C to 175°C) and active production status. Appropriate for temperature-critical applications.
UF4003 (Diotec Semiconductor) — Ultrafast recovery diode with 50 ns reverse recovery time and extended temperature range (-50°C to 175°C). ROHS3 compliant and in active production. Suitable for high-frequency switching applications.

Substitutes with Limitations:

1N4003-TP (Micro Commercial Co) — Marked as Not For New Designs; use only for maintenance of existing equipment.
1N3611 (Microchip Technology) — Standard recovery diode with superior reverse leakage characteristics (1 µA). Axial package format; verify mechanical fit in target application. RoHS non-compliant.
1N4935G (Taiwan Semiconductor Corporation) — Fast recovery variant with slightly elevated forward voltage (1.2 V). Suitable where fast recovery is required and forward voltage tolerance permits.

Frequently Asked Questions (FAQ)

Q: Can I use a fast recovery diode (such as EGP10D or UF4003) as a direct replacement for the DSF10TC?

A: Yes. Fast recovery diodes with 200 V reverse voltage rating and 1 A current rating are electrically compatible with the DSF10TC. Fast recovery characteristics provide equal or superior performance in standard applications. Verify circuit design does not depend on the slower recovery time of the original part.

Q: What is the difference between DO-204AL and DO-41 package designations?

A: DO-204AL and DO-41 refer to the same axial through-hole package format. Both designations are used interchangeably in industry documentation. All substitute parts listed are compatible with this package type.

Q: Why does the DSF10TC have a higher reverse leakage current (10 µA) compared to most substitutes (5 µA)?

A: Reverse leakage current variation is a normal characteristic of semiconductor manufacturing. The DSF10TC specification permits up to 10 µA; substitute parts with lower leakage (5 µA or 1 µA) provide equivalent or superior performance and are fully compatible.

Q: Is the 1N4003-TP suitable for new designs?

A: No. The 1N4003-TP is marked as Not For New Designs. Use this part only for maintenance and repair of existing equipment. For new designs, select from parts with Active or Last Time Buy status.

Q: What is the significance of ROHS3 compliance listed for some substitutes?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. This certification is relevant for applications subject to environmental regulations. The DSF10TC does not list RoHS status; substitutes with ROHS3 compliance provide regulatory alignment for modern applications.

Q: Can I substitute the 1N3611 (Axial package) for the DSF10TC (DO-204AL package)?

A: The 1N3611 is electrically compatible but uses a different axial package format. Verify mechanical fit and lead spacing in the target PCB layout before substitution. The part is RoHS non-compliant, which may be a consideration for regulated applications.

Q: Which substitute offers the best overall compatibility with the DSF10TC?

A: The 1N4003G offers the closest functional equivalence: identical voltage and current ratings, standard recovery characteristics matching the original specification, lower reverse leakage current, active production status, and ROHS3 compliance. This part is recommended as the primary substitute for direct replacement.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary by part number and supplier. The 1N4003-T (Diodes Incorporated) and 1N4003-E3/73 (Vishay) show high inventory availability (38,027 and 22,844 units respectively), providing supply chain reliability for volume applications.

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