DSF10TC-AT1 Equivalent & Substitute Parts

Part Overview

The DSF10TC-AT1 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 through-hole axial package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design and procurement requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Mandatory Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Mounting Type: Must be Through Hole
Package / Case: Must support DO-41 or DO-204AL axial configuration

Acceptable Variations:

Voltage - Forward (Vf) (Max) @ If: Tolerance range 1.0 V to 1.2 V @ 1 A
Current - Reverse Leakage @ Vr: May be lower than original specification
Recovery Speed: May be Standard (>500 ns) or Fast (≤500 ns)
Operating Temperature - Junction: May exceed original maximum of 150°C
Product Status: Active status preferred over obsolete

All four substitute parts meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	DSF10TC-AT1 (Main)	UF4003	1N4003-E3/54	1N4003G-T	1N4935-T
Manufacturer	onsemi	Diotec Semiconductor	Vishay General Semiconductor	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1.1 V @ 1 A	1 V @ 1 A	1.2 V @ 1 A
Speed	Standard Recovery >500ns	Fast Recovery ≤500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V	5 µA @ 200 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AC, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction (Max)	150°C	175°C	150°C	175°C	150°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

1N4003-E3/54 (Vishay General Semiconductor)

This substitute provides direct electrical equivalence with identical voltage and current ratings. Forward voltage specification of 1.1 V @ 1 A remains within acceptable tolerance. The part maintains standard recovery speed characteristics matching the original DSF10TC-AT1. Active product status with ROHS3 compliance and REACH unaffected designation supports long-term availability and regulatory compliance. Operating temperature range of -55°C to 150°C matches the original maximum junction temperature.

1N4003G-T (Diodes Incorporated)

This substitute meets all mandatory electrical parameters with identical voltage and current specifications. Forward voltage of 1 V @ 1 A matches the original specification exactly. Standard recovery speed maintains compatibility with original circuit behavior. Extended operating temperature range to 175°C provides thermal margin beyond the original 150°C maximum. Active product status with ROHS3 compliance ensures regulatory alignment and supply chain continuity.

1N4935-T (Diodes Incorporated)

This substitute satisfies all electrical requirements with 200 V reverse voltage and 1 A current rating. Forward voltage of 1.2 V @ 1 A represents the upper acceptable tolerance limit. Fast recovery speed (≤500 ns, 200 ns trr) offers improved switching characteristics compared to the original standard recovery specification. Extended operating temperature to 150°C maximum matches the original specification. Active product status with ROHS3 compliance supports procurement and regulatory requirements.

UF4003 (Diotec Semiconductor)

This substitute provides electrical equivalence with identical 200 V and 1 A ratings. Forward voltage of 1 V @ 1 A matches the original specification. Fast recovery speed (≤500 ns, 50 ns trr) offers superior switching performance. Extended operating temperature range to 175°C exceeds original specifications. Package designation as DO-204AC represents a variant of the DO-41 axial configuration. Active product status with ROHS3 compliance ensures regulatory compliance and availability.

Frequently Asked Questions (FAQ)

Q: Can the DSF10TC-AT1 be directly replaced with any of these substitute parts?

A: All four substitute parts meet the mandatory electrical parameters of 200 V reverse voltage and 1 A average rectified current in through-hole axial packages. Direct substitution is supported from an electrical standpoint. Physical package compatibility must be verified for specific PCB layouts, as DO-204AL and DO-204AC represent minor package variants within the DO-41 axial family.

Q: What is the difference between standard recovery and fast recovery diodes in these substitutes?

A: The DSF10TC-AT1 specifies standard recovery (>500 ns). The 1N4003-E3/54 and 1N4003G-T maintain standard recovery characteristics. The 1N4935-T and UF4003 feature fast recovery (≤500 ns), which reduces reverse recovery time and may improve switching performance in high-frequency applications. Fast recovery substitutes are electrically compatible but exhibit different transient behavior.

Q: Are there any forward voltage differences that affect circuit operation?

A: Forward voltage specifications range from 1.0 V to 1.2 V @ 1 A across all substitutes. The original DSF10TC-AT1 specifies 1.0 V @ 1 A. The 1N4935-T at 1.2 V represents the maximum variation. In most general-purpose rectification applications, this 0.2 V difference is negligible. Precision analog circuits or low-voltage applications may require circuit analysis to confirm acceptable performance.

Q: What is the significance of the reverse leakage current differences?

A: The original DSF10TC-AT1 specifies 10 µA @ 200 V reverse leakage. All substitute parts specify 5 µA @ 200 V, representing a 50% reduction in leakage current. Lower leakage current is beneficial and does not create compatibility issues. This improvement may enhance performance in high-impedance circuits or applications sensitive to leakage effects.

Q: Do package differences between DO-204AL and DO-204AC affect substitution?

A: Both DO-204AL and DO-204AC are variants of the DO-41 axial through-hole package. Physical dimensions and lead spacing are compatible for standard PCB layouts. The UF4003 is specified as DO-204AC while the original and most substitutes reference DO-204AL. Mechanical compatibility is maintained across these variants for typical through-hole assembly processes.

Q: Why are all substitute parts listed as active while the original is obsolete?

A: The DSF10TC-AT1 is classified as obsolete, indicating discontinued manufacturing by onsemi. All four substitute parts are classified as active, confirming current production and availability from their respective manufacturers. Active status ensures long-term supply chain reliability and supports ongoing procurement requirements for new designs and production runs.

Q: Are there compliance or regulatory considerations for substitution?

A: All substitute parts are ROHS3 compliant and REACH unaffected, matching or exceeding the regulatory status of the original DSF10TC-AT1. The original part carries EAR99 ECCN classification, which is not specified for substitutes but does not restrict substitution. All parts share identical HTSUS tariff codes (8541.10.0080 or 8541.10.0000), confirming trade classification compatibility.

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