KTC4075-Y-TP Equivalent & Substitute Parts

Part Overview

The KTC4075-Y-TP is a Surface Mount NPN Bipolar Junction Transistor manufactured by Micro Commercial Co, housed in a SOT-323 package. This component is rated for 50V collector-emitter breakdown voltage with a maximum collector current of 150 mA and 100 mW power dissipation. The device operates at a transition frequency of 80 MHz with a minimum DC current gain of 120 at specified conditions.

The KTC4075-Y-TP is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	150	mA
Power - Max	100	mW
Frequency - Transition	80	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 2mA, 6V	—
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the KTC4075-Y-TP are classified into three categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Equivalents share identical electrical specifications across all critical parameters: 50V breakdown voltage, 150 mA maximum collector current, 100 mW power rating, 80 MHz transition frequency, and matching saturation voltage characteristics. These parts are pin-compatible and functionally interchangeable within the same package footprint.

Similar Manufacturer Parts maintain core electrical compatibility in voltage and current ratings but exhibit differences in power dissipation capability (200 mW vs. 100 mW), transition frequency (100 MHz vs. 80 MHz), and saturation voltage characteristics. These parts operate within the same voltage and current envelope but offer enhanced performance margins in specific parameters.

Parametric Equivalents provide identical electrical performance to the main part with variations in packaging designations or manufacturing process codes. These parts meet all functional requirements and are suitable for direct substitution.

The following key parameters determine substitution eligibility:

Voltage - Collector Emitter Breakdown (Max): 50V minimum
Current - Collector (Ic) (Max): 150 mA minimum
Transistor Type: NPN
Package compatibility: SOT-323 or SC-70
Mounting Type: Surface Mount

Parameter Comparison

Parameter	KTC4075-Y-TP	2SC4116-Y,LF	2PC4081Q,135	2PC4081S,115	2SC4116-Y,LXHF	TTC4116FU,LF
Manufacturer	Micro Commercial Co	Toshiba	Nexperia USA Inc.	Nexperia USA Inc.	Toshiba	Toshiba
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50V	50V	50V	50V	50V	50V
Current - Collector (Ic) (Max)	150 mA	150 mA	150 mA	150 mA	150 mA	150 mA
Power - Max	100 mW	100 mW	200 mW	200 mW	100 mW	100 mW
Frequency - Transition	80 MHz	80 MHz	100 MHz	100 MHz	80 MHz	80 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 2mA, 6V	120 @ 2mA, 6V	120 @ 1mA, 6V	270 @ 1mA, 6V	120 @ 2mA, 6V	120 @ 2mA, 6V
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA
Operating Temperature (Max)	150°C	125°C	150°C	150°C	125°C	150°C
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitution (Highest Compatibility):

The 2SC4116-Y,LF and 2SC4116-Y,LXHF from Toshiba Semiconductor and Storage provide direct electrical and mechanical equivalence to the KTC4075-Y-TP. Both parts maintain identical specifications for voltage, current, power, transition frequency, and saturation characteristics. Both are ROHS3 compliant and carry Active product status, ensuring long-term availability. The 2SC4116-Y,LF is available in higher inventory (2000 pcs) compared to 2SC4116-Y,LXHF (6918 pcs). The primary distinction is operating temperature rating: 2SC4116-Y,LF supports 125°C maximum junction temperature, while 2SC4116-Y,LXHF supports 150°C, matching the original part specification.

The TTC4116FU,LF from Toshiba offers identical electrical performance and 150°C operating temperature capability with the highest inventory availability (88200 pcs). However, this part carries RoHS non-compliant status, which may restrict use in applications subject to RoHS regulations.

Enhanced Performance Substitution:

The 2PC4081Q,135 and 2PC4081S,115 from Nexperia USA Inc. provide enhanced performance characteristics while maintaining voltage and current compatibility. Both parts offer 200 mW power dissipation (versus 100 mW) and 100 MHz transition frequency (versus 80 MHz), delivering improved thermal and frequency margins. The 2PC4081S,115 provides superior DC current gain (270 @ 1mA, 6V) compared to the original specification (120 @ 2mA, 6V). Both parts are ROHS3 compliant, AEC-Q101 qualified for automotive applications, and carry Active product status. The 2PC4081S,115 offers significantly higher inventory (31144 pcs) relative to 2PC4081Q,135 (890 pcs).

Compliance Considerations:

For applications requiring RoHS3 compliance, select from 2SC4116-Y,LF, 2SC4116-Y,LXHF, 2PC4081Q,135, or 2PC4081S,115. The TTC4116FU,LF is unsuitable for RoHS-regulated applications.

For automotive-grade applications requiring AEC-Q101 qualification, select 2PC4081Q,135 or 2PC4081S,115.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4116-Y,LF directly replace the KTC4075-Y-TP?

A: Yes. The 2SC4116-Y,LF provides direct electrical and mechanical equivalence. All critical parameters—voltage rating, current rating, power dissipation, transition frequency, and saturation voltage—are identical. Pin configuration and package footprint (SOT-323) are compatible. The part is ROHS3 compliant and carries Active product status.

Q: What is the difference between 2SC4116-Y,LF and 2SC4116-Y,LXHF?

A: Both parts are electrically identical. The distinction is the manufacturing process code suffix. The 2SC4116-Y,LXHF supports 150°C maximum junction temperature, matching the original KTC4075-Y-TP specification, while 2SC4116-Y,LF supports 125°C. For applications operating near thermal limits, 2SC4116-Y,LXHF is preferred.

Q: Why do the Nexperia 2PC4081 parts have higher power ratings?

A: The 2PC4081Q,135 and 2PC4081S,115 are rated for 200 mW power dissipation compared to 100 mW for the KTC4075-Y-TP. This represents enhanced thermal capability within the same package. These parts also operate at 100 MHz transition frequency versus 80 MHz. These improvements provide additional performance margin but do not affect substitution compatibility for applications designed around the original 100 mW specification.

Q: Are the Nexperia 2PC4081 parts suitable for automotive applications?

A: Yes. Both 2PC4081Q,135 and 2PC4081S,115 carry AEC-Q101 automotive qualification and are suitable for automotive-grade applications. The KTC4075-Y-TP does not carry automotive qualification.

Q: What is the inventory status of available substitutes?

A: TTC4116FU,LF offers the highest inventory (88200 pcs). The 2PC4081S,115 provides substantial availability (31144 pcs). The 2SC4116-Y,LXHF (6918 pcs) and 2SC4116-Y,LF (2000 pcs) offer moderate availability. The 2PC4081Q,135 has limited inventory (890 pcs).

Q: Can the TTC4116FU,LF be used in RoHS-regulated applications?

A: No. The TTC4116FU,LF is RoHS non-compliant. Applications subject to RoHS regulations must use 2SC4116-Y,LF, 2SC4116-Y,LXHF, 2PC4081Q,135, or 2PC4081S,115.

Q: What is the difference in DC current gain between substitute parts?

A: The KTC4075-Y-TP specifies 120 minimum hFE at 2mA, 6V. The 2SC4116 variants maintain this specification. The 2PC4081Q,135 specifies 120 minimum hFE at 1mA, 6V. The 2PC4081S,115 specifies 270 minimum hFE at 1mA, 6V, providing significantly higher current gain. Higher hFE reduces base drive requirements in switching applications.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All listed substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: What is the maximum operating temperature for each substitute?

A: The KTC4075-Y-TP, 2PC4081Q,135, 2PC4081S,115, and TTC4116FU,LF support 150°C maximum junction temperature. The 2SC4116-Y,LF supports 125°C. The 2SC4116-Y,LXHF supports 125°C. For applications requiring 150°C operation, select from the first group or use 2SC4116-Y,LXHF with thermal margin verification.

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