DS135AC Equivalent & Substitute Parts

Part Overview

The DS135AC is a general-purpose rectifier diode manufactured by onsemi, rated for 400 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, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The DS135AC operates with standard recovery characteristics and is suitable for general rectification applications requiring these electrical specifications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 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 @ 400 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 DS135AC is determined by matching the following critical electrical and mechanical parameters:

Voltage Rating: 400 V DC reverse voltage (Vr) maximum
Current Rating: 1 A average rectified current (Io)
Forward Voltage: 1 V maximum at 1 A forward current
Recovery Speed: Standard recovery characteristics (>500ns, >200mA)
Package Type: DO-204AL / DO-41 axial through-hole configuration
Mounting: Through-hole technology

The substitute part 1N4004G meets all these electrical and mechanical requirements. The 1N4004G is manufactured by Rectron USA and maintains identical voltage and current ratings, forward voltage characteristics, and recovery speed specifications. Both components utilize the same through-hole axial package format, ensuring mechanical and electrical compatibility in existing circuit designs.

Parameter Comparison

Parameter	DS135AC (onsemi)	1N4004G (Rectron USA)	Match
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Yes
Current - Average Rectified (Io)	1 A	1 A	Yes
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	Yes
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Yes
Mounting Type	Through Hole	Through Hole	Yes
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Yes
Operating Temperature - Junction (Max)	150°C	175°C	Compatible
Current - Reverse Leakage @ Vr	10 µA @ 400 V	200 nA @ 400 V	Compatible
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The 1N4004G is a direct functional equivalent for the obsolete DS135AC. Both components share identical electrical ratings for voltage, current, and forward voltage characteristics, as well as matching package and mounting specifications.

The 1N4004G offers the following advantages for design continuity:

Active Product Status: The 1N4004G is currently in active production, ensuring long-term availability and supply chain stability compared to the obsolete DS135AC.
Enhanced Temperature Range: Operating temperature range of −65°C to 175°C provides broader thermal operating margin compared to the DS135AC maximum of 150°C.
Improved Reverse Leakage: Reverse leakage current of 200 nA at 400 V is significantly lower than the DS135AC specification of 10 µA, indicating superior device quality and lower standby current characteristics.
Automotive Qualification: The 1N4004G carries AEC-Q101 automotive qualification and ROHS3 compliance, meeting stringent reliability and environmental standards.
Packaging Availability: The 1N4004G is available in Tape & Reel (TR) packaging, supporting automated assembly processes.

Direct substitution of the 1N4004G for the DS135AC requires no circuit modifications and maintains full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 1N4004G directly replace the DS135AC without circuit modifications?

A: Yes. The 1N4004G is a direct substitute. Both components have identical voltage ratings (400 V), current ratings (1 A), forward voltage characteristics (1 V @ 1 A), recovery speed, and package format (DO-41 axial through-hole). No circuit design changes are required.

Q: What is the primary reason for substituting the DS135AC?

A: The DS135AC is classified as obsolete. The 1N4004G is an active product with equivalent electrical specifications and superior availability, ensuring design continuity and supply chain reliability.

Q: Are there any thermal considerations when substituting the 1N4004G for the DS135AC?

A: The 1N4004G has a higher maximum junction temperature (175°C) compared to the DS135AC (150°C). This provides additional thermal margin and is not a limiting factor for substitution. The 1N4004G operates safely across the full temperature range of the original design.

Q: Does the 1N4004G have different reverse leakage characteristics?

A: The 1N4004G exhibits lower reverse leakage current (200 nA @ 400 V) compared to the DS135AC (10 µA @ 400 V). This represents improved device performance and does not affect circuit compatibility. Lower leakage current reduces standby power consumption.

Q: What packaging formats are available for the 1N4004G?

A: The 1N4004G is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly operations. The physical package remains DO-41 axial through-hole format, maintaining mechanical compatibility with existing PCB designs.

Q: Is the 1N4004G compliant with environmental and automotive standards?

A: Yes. The 1N4004G is ROHS3 compliant and carries AEC-Q101 automotive qualification, meeting stringent reliability and environmental requirements. REACH compliance information is available upon request from the manufacturer.

Q: Can the 1N4004G be used in high-frequency switching applications?

A: Both the DS135AC and 1N4004G are specified for standard recovery characteristics (>500ns, >200mA). They are general-purpose rectifier diodes suitable for standard rectification applications. For high-frequency switching applications, fast-recovery or ultrafast-recovery diodes are required.

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