DLM10C-AT1 Equivalent & Substitute Parts

Part Overview

The DLM10C-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 (DO-41) axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical performance within the specified voltage and current ratings while accommodating through-hole mounting requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	980 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction (Max)	150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the DLM10C-AT1 is determined by the following mandatory electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 1 A minimum
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent

Secondary Compatibility Factors:

Forward voltage (Vf) within acceptable operating range
Reverse recovery time (trr) consistent with fast recovery classification
Reverse leakage current within acceptable limits for the application
Operating temperature rating sufficient for intended use

The identified substitute parts STTH102RL and UG1D-E3/54 satisfy all primary substitution criteria and maintain electrical performance within the specified parameters of the DLM10C-AT1.

Parameter Comparison

Parameter	DLM10C-AT1 (onsemi)	STTH102RL (STMicroelectronics)	UG1D-E3/54 (Vishay)
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	980 mV @ 1 A	970 mV @ 1 A	950 mV @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	20 ns	25 ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V	1 µA @ 200 V	5 µA @ 200 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	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
Product Status	Obsolete	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STTH102RL (STMicroelectronics) is a direct functional equivalent with active product status. This part meets all electrical specifications of the DLM10C-AT1 with improved performance characteristics: reverse recovery time of 20 ns (versus 35 ns), reduced reverse leakage current of 1 µA (versus 10 µA), and extended maximum junction temperature rating of 175°C (versus 150°C). ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support modern manufacturing and supply chain requirements. This part is recommended as the primary substitute for new designs and production continuity.

UG1D-E3/54 (Vishay General Semiconductor - Diodes Division) is a functionally equivalent alternative with active product status. This part satisfies all electrical requirements with comparable performance: reverse recovery time of 25 ns, reverse leakage current of 5 µA, and maximum junction temperature of 150°C matching the original specification. ROHS3 compliance and MSL 1 rating ensure compatibility with current manufacturing standards. This part is suitable as a secondary substitute option.

Both substitute parts are available in active production status, ensuring long-term supply availability and design continuity compared to the obsolete DLM10C-AT1.

Frequently Asked Questions (FAQ)

Q: Can STTH102RL or UG1D-E3/54 be used as direct replacements for DLM10C-AT1 in existing designs?

A: Yes. Both parts maintain identical voltage and current ratings (200 V, 1 A), fast recovery speed classification, and through-hole axial package configuration. Electrical performance is equivalent or superior across all specified parameters.

Q: What is the difference in reverse recovery time between the substitute parts and the original?

A: The DLM10C-AT1 specifies 35 ns reverse recovery time. STTH102RL provides 20 ns, and UG1D-E3/54 provides 25 ns. Both substitutes exhibit faster recovery characteristics, which is beneficial for switching applications and does not create compatibility issues.

Q: Are there package compatibility considerations?

A: All three parts use DO-204AL (DO-41) axial through-hole packages. Physical dimensions and lead spacing are compatible for direct board-level substitution without layout modifications.

Q: What is the significance of the lower reverse leakage current in the substitute parts?

A: The DLM10C-AT1 specifies 10 µA reverse leakage at 200 V. STTH102RL (1 µA) and UG1D-E3/54 (5 µA) exhibit lower leakage, which reduces power dissipation and improves circuit efficiency. This represents an improvement over the original specification.

Q: Do the substitute parts meet current regulatory compliance standards?

A: Yes. Both STTH102RL and UG1D-E3/54 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The obsolete DLM10C-AT1 does not carry these certifications.

Q: Which substitute part should be selected for new designs?

A: STTH102RL is recommended for new designs due to active product status, superior performance characteristics (20 ns reverse recovery time, 1 µA reverse leakage), and extended maximum junction temperature (175°C). UG1D-E3/54 is a viable alternative with equivalent functionality.

Q: Is there a difference in moisture sensitivity between the parts?

A: All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage, handling, or manufacturing processes.

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