DLM10C Equivalent & Substitute Parts

Part Overview

The DLM10C 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, making equivalent substitutes necessary for ongoing production and repair applications. The DLM10C features fast recovery characteristics with a reverse recovery time of 35 ns, suitable for applications requiring rapid switching performance in power supply and 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	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
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction (Max)	150	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the DLM10C is determined by strict electrical and mechanical compatibility across the following critical parameters:

Mandatory Matching Parameters:

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

Performance Considerations:

Speed Classification: Fast Recovery (≤ 500ns) or Standard Recovery (>500ns) variants are both acceptable as substitutes, provided all electrical ratings match
Reverse Recovery Time (trr): Substitute parts may have different trr values; faster recovery (lower trr) provides improved switching performance
Forward Voltage (Vf): Substitute parts may vary within typical diode specifications; higher Vf results in increased power dissipation
Reverse Leakage Current: Substitute parts may have lower leakage; this does not affect substitutability

Compliance and Status:

Active product status is preferred for new designs; Last Time Buy and Not For New Designs parts are acceptable for legacy applications
RoHS3 compliance is preferred but not mandatory for substitution
All substitute parts listed maintain REACH Unaffected status

Substitute parts are grouped into two categories: Direct Equivalents (matching speed classification and performance characteristics) and Functional Equivalents (meeting all electrical and mechanical requirements with acceptable performance variations).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
DLM10C	onsemi	200	1	980	Fast Recovery ≤ 500ns	35	10 @ 200V	DO-204AL	Obsolete	—
1N4003G	Taiwan Semiconductor Corporation	200	1	1000	Standard Recovery >500ns	—	5 @ 200V	DO-204AL	Active	ROHS3 Compliant
EGP10D	Fairchild Semiconductor	200	1	950	Fast Recovery ≤ 500ns	50	5 @ 200V	DO-204AL	Active	—
UF4003	Diotec Semiconductor	200	1	1000	Fast Recovery ≤ 500ns	50	5 @ 200V	DO-204AC	Active	ROHS3 Compliant
STTH102RL	STMicroelectronics	200	1	970	Fast Recovery ≤ 500ns	20	1 @ 200V	DO-204AL	Active	ROHS3 Compliant
1N3611	Microchip Technology	200	1	1100	Standard Recovery >500ns	—	1 @ 200V	Axial	Active	RoHS non-compliant
1N4003-T	Diodes Incorporated	200	1	1000	Standard Recovery >500ns	—	5 @ 200V	DO-204AL	Last Time Buy	ROHS3 Compliant
1N4003-TP	Micro Commercial Co	200	1	1100	Standard Recovery >500ns	2000	5 @ 200V	DO-204AL	Not For New Designs	ROHS3 Compliant
BYV26A-TAP	Vishay General Semiconductor - Diodes Division	200	1	2500	Fast Recovery ≤ 500ns	30	5 @ 200V	SOD-57	Active	ROHS3 Compliant
EGP10D-E3/54	Vishay General Semiconductor - Diodes Division	200	1	950	Fast Recovery ≤ 500ns	50	5 @ 200V	DO-204AL	Active	ROHS3 Compliant
EGP10D-E3/73	Vishay General Semiconductor - Diodes Division	200	1	950	Fast Recovery ≤ 500ns	50	5 @ 200V	DO-204AL	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Fast Recovery Applications (Preferred Direct Equivalents):

The STTH102RL (STMicroelectronics) is the optimal direct equivalent, matching the DLM10C's fast recovery speed classification (≤ 500ns) with superior performance characteristics: reverse recovery time of 20 ns (faster than DLM10C's 35 ns), forward voltage of 970 mV (comparable to DLM10C's 980 mV), and significantly lower reverse leakage current of 1 µA. The STTH102RL carries Active product status and ROHS3 compliance, making it suitable for new designs and legacy applications.

The EGP10D-E3/54 and EGP10D-E3/73 (Vishay General Semiconductor - Diodes Division) provide equivalent fast recovery performance with reverse recovery time of 50 ns and forward voltage of 950 mV. Both parts are Active and ROHS3 compliant. The EGP10D-E3/54 is available in Tape & Reel packaging, while EGP10D-E3/73 is available in standard packaging.

The UF4003 (Diotec Semiconductor) offers fast recovery characteristics with 50 ns reverse recovery time and is ROHS3 compliant. Note that UF4003 uses DO-204AC package variant; mechanical fit verification is required for applications with strict package envelope constraints.

For Standard Recovery Applications (Functional Equivalents):

The 1N4003G (Taiwan Semiconductor Corporation) is an Active, ROHS3-compliant substitute with standard recovery characteristics (>500ns). Forward voltage is 1000 mV with reverse leakage of 5 µA at 200 V.

The 1N4003-T (Diodes Incorporated) provides equivalent electrical performance with standard recovery speed. This part carries Last Time Buy status, indicating limited future availability; it is suitable for legacy production but not recommended for new designs.

The 1N4003-TP (Micro Commercial Co) is classified as Not For New Designs and carries extended reverse recovery time of 2 µs; this part is acceptable only for legacy applications where design changes are not feasible.

Package Considerations:

The 1N3611 (Microchip Technology) uses Axial package (A) instead of DO-204AL. While electrically equivalent, mechanical fit differs; this part is suitable only for applications with axial lead compatibility.

The BYV26A-TAP (Vishay General Semiconductor - Diodes Division) uses SOD-57 package and features avalanche technology with significantly higher forward voltage (2500 mV @ 1 A). This part is not recommended as a direct substitute due to package incompatibility and higher power dissipation.

Compliance Summary:

For new designs, select from Active status parts with ROHS3 compliance: STTH102RL, EGP10D-E3/54, EGP10D-E3/73, UF4003, or 1N4003G. For legacy applications, Last Time Buy and Not For New Designs parts (1N4003-T, 1N4003-TP) are acceptable if design changes are not feasible.

Frequently Asked Questions (FAQ)

Q: Can I substitute the DLM10C with any 200 V, 1 A diode?

A: No. Substitution requires matching voltage rating (200 V), current rating (1 A), and through-hole mounting type. Package compatibility (DO-204AL, DO-41, or Axial) must also be verified. Speed classification (fast recovery vs. standard recovery) may differ, but all other electrical parameters must remain within acceptable ranges for the application.

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

A: Fast recovery diodes have reverse recovery time (trr) of 500 ns or less, enabling rapid switching and reduced switching losses in high-frequency applications. Standard recovery diodes have trr greater than 500 ns and are suitable for lower-frequency rectification. The DLM10C is a fast recovery device (35 ns trr); substitutes with either classification are electrically compatible, but fast recovery substitutes (STTH102RL, EGP10D series, UF4003) preserve performance characteristics.

Q: Is the STTH102RL a direct replacement for the DLM10C?

A: Yes. The STTH102RL matches all critical parameters: 200 V reverse voltage, 1 A average rectified current, DO-204AL package, through-hole mounting, and fast recovery speed classification. The STTH102RL offers improved performance with faster reverse recovery time (20 ns vs. 35 ns) and lower reverse leakage current (1 µA vs. 10 µA). It is Active status and ROHS3 compliant.

Q: Can I use the 1N4003-TP as a substitute?

A: The 1N4003-TP is electrically compatible (200 V, 1 A, DO-204AL package) but carries Not For New Designs status and extended reverse recovery time (2 µs). It is acceptable only for legacy applications where design changes are not feasible. For new designs or ongoing production, select from Active status alternatives such as STTH102RL, EGP10D-E3/54, or 1N4003G.

Q: What does "Last Time Buy" status mean?

A: Last Time Buy indicates that the manufacturer has announced end-of-life for the part and will accept orders only until a specified cutoff date. The 1N4003-T carries this status. After the cutoff date, the part will no longer be available. For applications currently using Last Time Buy parts, transition planning to Active alternatives is recommended.

Q: Why does the BYV26A-TAP have such high forward voltage compared to other substitutes?

A: The BYV26A-TAP is an avalanche diode with different internal structure and technology compared to standard rectifier diodes. The 2500 mV forward voltage at 1 A results in significantly higher power dissipation and heat generation. This part is not recommended as a substitute for the DLM10C in standard rectification applications.

Q: Can I use the 1N3611 in place of the DLM10C?

A: The 1N3611 is electrically equivalent (200 V, 1 A) but uses Axial package (A) instead of DO-204AL. Mechanical fit differs; the 1N3611 has axial leads suitable for through-hole mounting in axial-lead footprints only. It is not compatible with DO-204AL footprints. Verify package compatibility before selection.

Q: What is the significance of RoHS3 compliance?

A: ROHS3 compliance indicates that the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. For applications subject to environmental regulations or customer requirements, select ROHS3-compliant substitutes. The DLM10C does not specify RoHS status; most modern substitutes (STTH102RL, EGP10D series, UF4003, 1N4003G, 1N4003-T) are ROHS3 compliant.

Q: Does reverse recovery time affect circuit performance?

A: Yes. Reverse recovery time (trr) determines how quickly the diode transitions from conducting to blocking state. Shorter trr reduces switching losses and enables higher-frequency operation. The DLM10C has 35 ns trr; the STTH102RL has 20 ns (faster), while standard recovery substitutes have trr >500 ns. For high-frequency switching applications, fast recovery substitutes are preferred.

Q: Can I mix different substitute parts in the same circuit?

A: Mixing different diode types in the same circuit is not recommended unless the circuit design explicitly accounts for parameter variations. Differences in forward voltage, reverse leakage, and recovery time can cause unequal current distribution and thermal stress. For production consistency, use a single substitute part number throughout the circuit.

Q: What is the operating temperature range for substitutes?

A: The DLM10C specifies maximum junction temperature of 150°C. Substitute parts vary: STTH102RL (175°C max), EGP10D series (-65°C to 150°C), UF4003 (-50°C to 175°C), 1N4003G (-55°C to 150°C), 1N3611 (-65°C to 175°C). For applications operating near temperature limits, verify that the selected substitute's operating range meets circuit requirements.

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