KTC4075-O-TP Equivalent & Substitute Parts

Part Overview

The KTC4075-O-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This surface mount device operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 150 mA and 100 mW power dissipation. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing production and maintenance applications. Active substitute parts with identical or enhanced electrical characteristics are available from multiple manufacturers.

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	70 @ 2mA, 6V	—
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (TJ)	150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the KTC4075-O-TP is determined by electrical and mechanical parameter equivalence. All substitute parts must satisfy the following criteria:

Mandatory Matching Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 50 V minimum
Current - Collector (Ic) (Max): 150 mA minimum
Package / Case: SC-70 or SOT-323 compatible
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Parameter Variations:

Power dissipation may exceed 100 mW
Frequency - Transition may exceed 80 MHz
DC Current Gain (hFE) may exceed minimum specification
Operating Temperature may exceed 150°C
Vce Saturation may differ within acceptable switching performance ranges

Three substitute parts meet these criteria with varying performance enhancements and product status classifications.

Parameter Comparison

Parameter	KTC4075-O-TP	2SC4116-GR,LF	2PC4081Q,135	2SC4081T106Q
Manufacturer	Micro Commercial Co	Toshiba Semiconductor and Storage	Nexperia USA Inc.	Rohm Semiconductor
Product Status	Obsolete	Active	Active	Not For New Designs
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	50 V	50 V
Current - Collector (Ic) (Max)	150 mA	150 mA	150 mA	150 mA
Power - Max	100 mW	100 mW	200 mW	200 mW
Frequency - Transition	80 MHz	80 MHz	100 MHz	180 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 2mA, 6V	70 @ 2mA, 6V	120 @ 1mA, 6V	120 @ 1mA, 6V
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	250mV @ 10mA, 100mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA
Operating Temperature (TJ)	150°C	125°C	150°C	150°C
Package / Case	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

2SC4116-GR,LF (Toshiba Semiconductor and Storage)

This part is the closest electrical equivalent to the KTC4075-O-TP, matching all primary specifications including power dissipation (100 mW), transition frequency (80 MHz), and DC current gain characteristics. The part maintains Active product status, ensuring long-term availability and supply chain stability. Operating temperature is specified at 125°C, which is 25°C lower than the original part. This substitute is suitable for direct replacement in applications where the reduced thermal rating does not constrain circuit operation.

2PC4081Q,135 (Nexperia USA Inc.)

This part provides enhanced performance characteristics with doubled power dissipation (200 mW) and increased transition frequency (100 MHz). DC current gain is elevated to 120 @ 1mA, 6V, providing improved amplification capability. The part carries Automotive grade qualification (AEC-Q101) and maintains Active product status. Operating temperature matches the original specification at 150°C. Vce saturation is specified at 400mV @ 5mA, 50mA, representing a trade-off in saturation performance. This substitute is appropriate for applications requiring enhanced power handling or higher frequency operation.

2SC4081T106Q (Rohm Semiconductor)

This part offers the highest transition frequency (180 MHz) among available substitutes, with doubled power dissipation (200 mW) and elevated DC current gain (120 @ 1mA, 6V). The part is classified as Not For New Designs, indicating Rohm has transitioned this product to end-of-life status. Operating temperature and Vce saturation specifications match the 2PC4081Q,135. This substitute is suitable only for maintenance and repair of existing equipment where new design qualification is not required.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4116-GR,LF directly replace the KTC4075-O-TP in all applications?

A: The 2SC4116-GR,LF is electrically equivalent for applications operating within 125°C maximum junction temperature. If the original circuit design requires operation above 125°C, thermal analysis is necessary to confirm the reduced operating temperature limit does not affect circuit performance.

Q: What is the primary difference between the 2PC4081Q,135 and 2SC4116-GR,LF?

A: The 2PC4081Q,135 provides doubled power dissipation (200 mW vs. 100 mW), higher transition frequency (100 MHz vs. 80 MHz), and elevated DC current gain (120 vs. 70). The 2SC4116-GR,LF maintains identical power and frequency specifications to the original KTC4075-O-TP. Selection depends on whether the application requires enhanced performance or direct specification matching.

Q: Why is the 2SC4081T106Q listed as "Not For New Designs"?

A: This classification indicates the manufacturer has discontinued active development and is transitioning the product to end-of-life. The part remains available for existing applications but should not be selected for new circuit designs. Use this substitute only for maintenance and repair of equipment already in service.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All substitute parts use SC-70 or SOT-323 package designations and surface mount mounting type, ensuring mechanical and footprint compatibility. No PCB layout modifications are required for substitution.

Q: What is the significance of the Automotive grade qualification on the 2PC4081Q,135?

A: The AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. This qualification is relevant only if the application requires automotive-grade components. For non-automotive applications, this qualification provides no functional advantage.

Q: Can the 2PC4081Q,135 be used in high-frequency applications where the KTC4075-O-TP was marginal?

A: Yes. The 2PC4081Q,135 provides 100 MHz transition frequency compared to the original 80 MHz specification, enabling operation in higher-frequency switching and amplification circuits. However, circuit-level validation is required to confirm performance improvements translate to the intended application.

Q: What is the impact of different Vce saturation specifications among substitutes?

A: The KTC4075-O-TP and 2SC4116-GR,LF specify 250mV @ 10mA, 100mA saturation voltage, while the 2PC4081Q,135 and 2SC4081T106Q specify 400mV @ 5mA, 50mA. Higher saturation voltage increases power dissipation in saturated switching applications. Applications sensitive to saturation voltage must account for this parameter difference during circuit analysis.

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