2SD1835T Equivalent & Substitute Parts

Part Overview

The 2SD1835T is an NPN bipolar junction transistor manufactured by onsemi, rated for 50V collector-emitter breakdown voltage and 2A maximum collector current. This component is classified as obsolete, necessitating identification of equivalent or substitute parts for ongoing design requirements or production continuity. The 2SD1835T features a through-hole 3-NP package configuration and is suitable for applications requiring moderate power dissipation up to 750mW and switching frequencies up to 150MHz.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	2	A
Power - Max	750	mW
Frequency - Transition	150	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitute parts for the 2SD1835T are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Transistor Type: NPN configuration
Voltage - Collector Emitter Breakdown (Max): 50V minimum
Mounting Type: Through Hole
Package / Case: TO-92-3 compatible

Secondary Considerations:

Current - Collector (Ic) (Max): Equal to or greater than application requirements
Power - Max: Equal to or greater than application requirements
Frequency - Transition: Equal to or greater than application requirements

The substitute parts listed below satisfy the primary matching criteria. Selection between substitutes depends on specific application current and power requirements.

Parameter Comparison

Parameter	2SD1835T	2SD1801T-E	KSC1815YTA	Unit
Transistor Type	NPN	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	50	50	V
Current - Collector (Ic) (Max)	2	2	0.15	A
Power - Max	750	—	400	mW
Frequency - Transition	150	—	80	MHz
Operating Temperature (TJ)	150	—	150	°C
Mounting Type	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-92-3	—	TO-92-3	—
Product Status	Obsolete	Obsolete	Active	—

Engineering Selection Recommendations

2SD1801T-E (onsemi): This substitute maintains electrical equivalence with the 2SD1835T across voltage and current ratings. Both components are classified as obsolete. Selection of this part is appropriate when inventory availability is the primary consideration and electrical specifications align with application requirements. Compliance status is equivalent to the main part (REACH Unaffected, EAR99 classification).

KSC1815YTA (onsemi): This substitute is classified as active product status, providing long-term availability assurance compared to the obsolete 2SD1835T. The KSC1815YTA is rated for 150mA maximum collector current and 400mW maximum power dissipation, representing reduced current and power handling capability relative to the 2SD1835T. The transition frequency is 80MHz compared to 150MHz for the main part. This substitute is suitable for applications where collector current requirements do not exceed 150mA and power dissipation remains below 400mW. RoHS3 compliance provides additional regulatory advantage. The KSC1815YTA is supplied in Cut Tape packaging with formed leads.

Frequently Asked Questions (FAQ)

Q: Can the KSC1815YTA directly replace the 2SD1835T in all applications?

A: The KSC1815YTA is not a direct replacement for all applications. While both transistors share the same 50V collector-emitter breakdown voltage and NPN configuration, the KSC1815YTA is limited to 150mA maximum collector current and 400mW power dissipation, compared to 2A and 750mW for the 2SD1835T. Applications requiring collector currents above 150mA or power dissipation above 400mW require the 2SD1801T-E or continued use of the 2SD1835T.

Q: What is the primary advantage of selecting the KSC1815YTA over the 2SD1801T-E?

A: The KSC1815YTA carries active product status, ensuring continued manufacturing and availability. Both the 2SD1835T and 2SD1801T-E are classified as obsolete. For new designs or long-term production requirements, the KSC1815YTA provides supply chain continuity, provided application current and power requirements fall within its specifications.

Q: Are there package compatibility considerations between these substitutes?

A: The 2SD1835T and 2SD1801T-E both utilize TO-92-3 package configuration. The KSC1815YTA is supplied in TO-92-3 with formed leads in Cut Tape packaging. All three components are through-hole mounted and physically compatible with standard TO-92-3 footprints.

Q: What compliance certifications apply to these substitutes?

A: The 2SD1835T and 2SD1801T-E both carry REACH Unaffected status and EAR99 ECCN classification. The KSC1815YTA additionally carries RoHS3 compliance certification, providing enhanced regulatory alignment with current environmental standards.

Q: Can the 2SD1801T-E be considered a direct equivalent to the 2SD1835T?

A: The 2SD1801T-E matches the 2SD1835T in voltage rating (50V) and current rating (2A), making it functionally equivalent for applications within these specifications. However, both parts are obsolete. The 2SD1801T-E is appropriate for replacement inventory or legacy system maintenance where active product status is not required.

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