UG1003-T Equivalent & Substitute Parts

Part Overview

The UG1003-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The UG1003-T features fast recovery characteristics with a reverse recovery time of 50 ns, suitable for applications requiring rapid switching performance in low-voltage rectification circuits.

Key Parameters

Parameter	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 Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the UG1003-T is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package compatibility: DO-41, DO-204AL, or equivalent axial packages

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current
Reverse recovery time (trr) and speed classification
Reverse leakage current
Operating temperature range
RoHS and REACH compliance status

Substitute parts are grouped into two categories: Parametric Equivalents (matching fast recovery characteristics and all primary electrical specifications) and Functional Alternatives (meeting voltage and current ratings with standard recovery characteristics). Parts with identical electrical ratings but different package designations (DO-41 vs. DO-204AL vs. axial) are considered mechanically compatible when mounted in through-hole applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	RoHS
UG1003-T	Diodes Incorporated	200	1	1.0 @ 1A	Fast Recovery ≤ 500ns	50	5 @ 200V	DO-41	-65 to 150	Obsolete	ROHS3
UF1003-T	Diodes Incorporated	200	1	1.0 @ 1A	Fast Recovery ≤ 500ns	50	5 @ 200V	DO-41	-65 to 150	Active	ROHS3
1N3611	Microchip Technology	200	1	1.1 @ 1A	Standard Recovery >500ns	—	1 @ 200V	Axial	-65 to 175	Active	Non-compliant
1N4003G	Taiwan Semiconductor Corporation	200	1	1.0 @ 1A	Standard Recovery >500ns	—	5 @ 200V	DO-41	-55 to 150	Active	ROHS3
1N4003GP-E3/54	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1A	Standard Recovery >500ns	2000	5 @ 200V	DO-41	-65 to 175	Active	ROHS3
1N4003GP-E3/73	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1A	Standard Recovery >500ns	2000	5 @ 200V	DO-41	-65 to 175	Active	ROHS3
1N4003RLG	onsemi	200	1	1.1 @ 1A	Standard Recovery >500ns	—	10 @ 200V	Axial	-65 to 175	Not For New Designs	ROHS3
1N4383GP-E3/54	Vishay General Semiconductor - Diodes Division	200	1	1.0 @ 1A	Standard Recovery >500ns	2000	5 @ 200V	DO-15	-65 to 175	Active	ROHS3
1N4935-E3/54	Vishay General Semiconductor - Diodes Division	200	1	1.2 @ 1A	Fast Recovery ≤ 500ns	200	5 @ 200V	DO-41	-50 to 150	Active	ROHS3
1N4935G	Taiwan Semiconductor Corporation	200	1	1.2 @ 1A	Fast Recovery ≤ 500ns	200	5 @ 200V	DO-41	-55 to 150	Active	ROHS3
1N4935GHB0G	Taiwan Semiconductor Corporation	200	1	1.2 @ 1A	Fast Recovery ≤ 500ns	200	5 @ 200V	DO-41	-55 to 150	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalent (Recommended Primary Substitute):

The UF1003-T from Diodes Incorporated is the direct parametric equivalent to the UG1003-T. It maintains identical electrical specifications including 200 V reverse voltage, 1 A average rectified current, 1 V forward voltage at 1 A, and fast recovery characteristics with 50 ns reverse recovery time. The UF1003-T is currently in active product status, ensuring long-term availability. Both parts are ROHS3 compliant and share the same operating temperature range (-65°C to 150°C). The primary difference is packaging format (Cut Tape vs. bulk), which does not affect electrical performance in through-hole applications.

Fast Recovery Alternatives (Electrical Equivalents):

The 1N4935-E3/54 and 1N4935G maintain fast recovery characteristics (≤ 500ns) with 200 ns reverse recovery time, meeting the speed classification of the UG1003-T. Both are rated for 200 V and 1 A with active product status and ROHS3 compliance. The 1N4935-E3/54 extends the operating temperature range to -50°C to 150°C, while the 1N4935G operates from -55°C to 150°C. Forward voltage is slightly elevated at 1.2 V @ 1 A compared to the UG1003-T specification of 1.0 V @ 1 A. These parts are suitable for applications where fast switching performance is required.

Standard Recovery Alternatives (Functional Substitutes):

The 1N4003G, 1N4003GP-E3/54, and 1N4003GP-E3/73 provide functional substitution with identical voltage and current ratings but employ standard recovery characteristics (>500ns). These parts are widely available with active product status and ROHS3 compliance. The 1N4003GP variants extend the operating temperature range to -65°C to 175°C. Forward voltage is specified at 1.0 V @ 1 A (1N4003G) or 1.1 V @ 1 A (1N4003GP variants). These alternatives are appropriate for applications where switching speed is not a critical design parameter.

Package Compatibility Considerations:

The 1N4383GP-E3/54 provides electrical equivalence in a DO-15 (DO-204AC) package instead of DO-41. This part maintains 200 V, 1 A ratings with 1.0 V forward voltage and standard recovery characteristics. Physical package differences require verification of PCB layout compatibility before substitution.

The 1N3611 from Microchip Technology and 1N4003RLG from onsemi are available in axial package configurations. The 1N3611 is not RoHS compliant, which may restrict use in regulated applications. The 1N4003RLG carries a "Not For New Designs" status, limiting its suitability for new development.

Automotive-Grade Option:

The 1N4935GHB0G is qualified to AEC-Q101 automotive standards, providing the same electrical performance as the 1N4935G with automotive-grade reliability assurance. This part is suitable for automotive and harsh-environment applications requiring fast recovery performance.

Frequently Asked Questions (FAQ)

Q: Can the UF1003-T directly replace the UG1003-T without circuit modification?

A: Yes. The UF1003-T is a parametric equivalent with identical electrical specifications: 200 V reverse voltage, 1 A average rectified current, 1 V forward voltage at 1 A, and 50 ns reverse recovery time. Both parts operate across -65°C to 150°C and are ROHS3 compliant. The only difference is packaging format (Cut Tape vs. bulk), which does not affect electrical performance in through-hole applications.

Q: What is the difference between fast recovery and standard recovery diodes in this voltage/current class?

A: Fast recovery diodes (UG1003-T, UF1003-T, 1N4935 series) have reverse recovery times ≤ 500 ns, enabling rapid switching transitions. Standard recovery diodes (1N4003 series) have reverse recovery times > 500 ns. Fast recovery is required in high-frequency switching applications, while standard recovery is sufficient for low-frequency rectification. The UG1003-T specifies 50 ns recovery time, making it suitable for applications requiring rapid switching performance.

Q: Are the 1N4003 series parts suitable replacements for the UG1003-T?

A: The 1N4003 series provides functional substitution for voltage and current ratings (200 V, 1 A) but employs standard recovery characteristics instead of fast recovery. If the application circuit depends on the fast switching performance of the UG1003-T (50 ns recovery time), the 1N4003 series is not appropriate. If the circuit operates at low switching frequencies where recovery time is not critical, the 1N4003 series is acceptable. Verify circuit performance requirements before substitution.

Q: What is the significance of the different package designations (DO-41, DO-204AL, DO-15)?

A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package used by the UG1003-T and most substitute parts. DO-15 (DO-204AC) is a smaller axial package used by the 1N4383GP-E3/54. All three are through-hole packages suitable for PCB mounting, but physical dimensions differ. Verify PCB layout compatibility before substituting parts with different package designations.

Q: Why is the 1N4003RLG marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that the manufacturer (onsemi) is not recommending this part for new circuit development. While the part remains available and functional, it may have limited long-term availability or may be superseded by newer alternatives. For new designs, select parts with "Active" product status such as the 1N4003GP-E3/54 or 1N4003G.

Q: Is the 1N3611 from Microchip Technology a suitable replacement?

A: The 1N3611 meets the voltage (200 V) and current (1 A) requirements but is not RoHS compliant, which restricts its use in regulated applications and regions with RoHS requirements. Additionally, it employs standard recovery characteristics and is available only in axial package format. The 1N3611 is suitable only for legacy applications where RoHS compliance is not required and switching speed is not critical.

Q: What does AEC-Q101 qualification mean for the 1N4935GHB0G?

A: AEC-Q101 is an automotive industry standard qualification for discrete semiconductors. The 1N4935GHB0G meets this qualification, indicating it has been tested and validated for automotive applications including temperature cycling, vibration, and reliability requirements. This part is suitable for automotive and harsh-environment applications requiring fast recovery performance and automotive-grade reliability assurance.

Q: Can I use the 1N4935 series as a direct replacement for the UG1003-T?

A: The 1N4935 series (1N4935-E3/54, 1N4935G, 1N4935GHB0G) maintains fast recovery characteristics and 200 V, 1 A ratings, making them electrically compatible. However, forward voltage is specified at 1.2 V @ 1 A compared to the UG1003-T specification of 1.0 V @ 1 A. This 0.2 V difference may affect circuit performance in applications with tight voltage budgets or high-current rectification stages. Verify circuit tolerance before substitution.

Q: What is the difference between the 1N4003GP-E3/54 and 1N4003GP-E3/73?

A: Both parts are electrically identical with 200 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage at 1 A, and standard recovery characteristics. The difference is in the tape reel configuration used for automated assembly (E3/54 vs. E3/73). For manual assembly or through-hole applications, both parts are functionally equivalent. Select based on assembly equipment compatibility.

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