2SD1835S Equivalent & Substitute Parts

Part Overview

The 2SD1835S is an NPN bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 2 A maximum collector current. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. The 2SD1835S features a through-hole 3-NP package configuration suitable for conventional PCB assembly methods.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V
Current - Collector (Ic) (Max)	2 A
Power - Max	750 mW
Frequency - Transition	150 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	140 @ 100mA, 2V
Vce Saturation (Max) @ Ib, Ic	400mV @ 50mA, 1A
Current - Collector Cutoff (Max)	100nA (ICBO)
Operating Temperature (TJ)	150°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)

Substitute Part Grouping Explanation

Substitute parts for the 2SD1835S are identified based on electrical parameter compatibility within the following criteria:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 50 V minimum
Current - Collector (Ic) (Max): Equal to or greater than 2 A
Frequency - Transition: 150 MHz or higher
DC Current Gain (hFE): 140 or greater at specified test conditions
Operating Temperature: 150°C or higher
Mounting Type: Through Hole

Secondary Compatibility Factors:

Package configuration compatibility with PCB layout requirements
Vce saturation characteristics for switching applications
Power dissipation capability

The 2SD1835S lists KSC1815YTA as a documented substitute. However, the KSC1815YTA exhibits reduced maximum collector current (150 mA versus 2 A) and lower power dissipation (400 mW versus 750 mW), limiting its application scope to lower-current circuit designs.

The 2SD1801S-E demonstrates full electrical parameter compatibility with the 2SD1835S, including identical voltage and current ratings, matching DC current gain specifications, and equivalent frequency response. The primary distinction is package configuration (TO-251-3 versus TO-226-3/TO-92-3) and marginally increased power rating (800 mW versus 750 mW).

Parameter Comparison

Parameter	2SD1835S	2SD1801S-E	KSC1815YTA
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	50 V
Current - Collector (Ic) (Max)	2 A	2 A	150 mA
Power - Max	750 mW	800 mW	400 mW
Frequency - Transition	150 MHz	150 MHz	80 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	140 @ 100mA, 2V	140 @ 100mA, 2V	70 @ 2mA, 6V
Vce Saturation (Max) @ Ib, Ic	400mV @ 50mA, 1A	400mV @ 50mA, 1A	250mV @ 10mA, 100mA
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)
Operating Temperature (TJ)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-251-3 Short Leads, IPak	TO-226-3, TO-92-3 Formed Leads
Product Status	Obsolete	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SD1801S-E is the primary electrical equivalent for the 2SD1835S, offering identical collector current (2 A), voltage rating (50 V), DC current gain (140 @ 100mA, 2V), and transition frequency (150 MHz). The 2SD1801S-E provides ROHS3 compliance certification, whereas the 2SD1835S compliance status is not specified. The primary design consideration is package configuration: the 2SD1801S-E utilizes TO-251-3 (IPak) packaging versus the 2SD1835S TO-226-3/TO-92-3 configuration. PCB layout modifications are required if package substitution is implemented.

KSC1815YTA is an active-status alternative suitable only for applications requiring collector currents not exceeding 150 mA. This part provides ROHS3 compliance and maintains the TO-92-3 package compatibility with the 2SD1835S. The KSC1815YTA is not suitable for circuits designed for the full 2 A current capability of the 2SD1835S. The reduced transition frequency (80 MHz versus 150 MHz) and lower DC current gain (70 @ 2mA, 6V) further restrict application scope.

Frequently Asked Questions (FAQ)

Q: Can the 2SD1801S-E directly replace the 2SD1835S without circuit modification?

A: The 2SD1801S-E provides electrical equivalence for all critical parameters (voltage, current, gain, frequency). However, the package configuration differs (TO-251-3 versus TO-92-3/TO-226-3), requiring PCB layout and footprint modifications. Electrical circuit operation remains unchanged.

Q: Is the KSC1815YTA suitable for all 2SD1835S applications?

A: No. The KSC1815YTA maximum collector current rating (150 mA) is insufficient for circuits requiring the 2SD1835S 2 A capability. The KSC1815YTA is limited to low-current applications only. Additionally, the reduced transition frequency (80 MHz) restricts high-frequency performance.

Q: What is the primary difference between the 2SD1835S and 2SD1801S-E?

A: The primary difference is package configuration. The 2SD1835S uses TO-226-3/TO-92-3 through-hole packages, while the 2SD1801S-E uses TO-251-3 (IPak) packaging. All electrical specifications are equivalent. The 2SD1801S-E provides ROHS3 compliance certification.

Q: Why is the 2SD1835S classified as obsolete?

A: The 2SD1835S is listed as obsolete by the manufacturer. The KSC1815YTA maintains active product status, while the 2SD1801S-E is also obsolete. For new designs, the KSC1815YTA is the only active substitute, though it is limited to lower-current applications.

Q: Can package-compatible alternatives be used if electrical parameters differ?

A: No. Electrical parameter compatibility is the primary substitution criterion. Package compatibility alone is insufficient. The KSC1815YTA shares the TO-92-3 package with the 2SD1835S but exhibits significantly reduced current and power ratings, making it unsuitable for equivalent functionality in high-current circuits.

Q: What compliance certifications should be verified for new production?

A: The 2SD1801S-E and KSC1815YTA both provide ROHS3 compliance certification. Both parts maintain REACH Unaffected status and EAR99 ECCN classification, matching the 2SD1835S regulatory profile. Verify compliance requirements for specific application jurisdictions.

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