KTC4075-BL-TP Equivalent & Substitute Parts

Part Overview

The KTC4075-BL-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device is rated for 50 V collector-emitter breakdown voltage with a maximum collector current of 150 mA and operates at frequencies up to 80 MHz. The component is packaged in a surface-mount SOT-323 (SC-70) configuration with a maximum power dissipation of 100 mW.

The KTC4075-BL-TP carries an Obsolete product status. Equivalent and substitute parts are 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
Vce Saturation (Max) @ Ib, Ic	250 mV @ 10 mA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	350 @ 2 mA, 6 V	—
Power - Max	100	mW
Frequency - Transition	80	MHz
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the KTC4075-BL-TP are classified based on electrical and mechanical compatibility within the following criteria:

Direct Equivalents maintain identical or tightly matched electrical specifications across all critical parameters: 50 V collector-emitter breakdown voltage, 150 mA maximum collector current, 100 mW power dissipation, 80 MHz transition frequency, and matching saturation voltage characteristics (250 mV @ 10 mA, 100 mA). These parts are pin-compatible and package-compatible in SC-70 or SOT-323 configurations.

Similar Substitutes share the same voltage and current ratings (50 V, 150 mA) and package form factor but exhibit variations in one or more secondary parameters. These variations include higher power dissipation (200 mW), increased transition frequency (100 MHz or 180 MHz), or different saturation voltage specifications (400 mV @ 5 mA, 50 mA). These parts are functionally compatible for most applications but require verification of circuit-specific requirements.

Parametric Equivalents match the primary electrical specifications of the KTC4075-BL-TP with identical saturation voltage and gain characteristics but may differ in secondary parameters such as operating temperature range or packaging format.

Substitution eligibility is determined by:

Voltage rating ≥ 50 V
Current rating ≥ 150 mA
Power dissipation ≥ 100 mW
Transition frequency ≥ 80 MHz
Package compatibility: SC-70 or SOT-323
Surface-mount configuration
RoHS3 compliance

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat (Max)	hFE (Min)	Power (Max) mW	Frequency MHz	Package	Status
KTC4075-BL-TP	Micro Commercial Co	150	50	250 mV @ 10 mA, 100 mA	350 @ 2 mA, 6 V	100	80	SOT-323	Obsolete
2SC4116-BL,LF	Toshiba Semiconductor and Storage	150	50	250 mV @ 10 mA, 100 mA	350 @ 2 mA, 6 V	100	80	SC-70	Active
2SC4116-BL,LXHF	Toshiba Semiconductor and Storage	150	50	250 mV @ 10 mA, 100 mA	350 @ 2 mA, 6 V	100	80	SC-70	Active
2PC4081R,115	Nexperia USA Inc.	150	50	400 mV @ 5 mA, 50 mA	180 @ 1 mA, 6 V	200	100	SOT-323	Active
2PC4081S,135	NXP USA Inc.	150	50	400 mV @ 5 mA, 50 mA	270 @ 1 mA, 6 V	200	100	SOT-323	Active
2SC4081T106R	Rohm Semiconductor	150	50	400 mV @ 5 mA, 50 mA	180 @ 1 mA, 6 V	200	180	UMT3	Not For New Designs

Engineering Selection Recommendations

Direct Replacement (Preferred):

The 2SC4116-BL,LF and 2SC4116-BL,LXHF manufactured by Toshiba Semiconductor and Storage are direct electrical and mechanical equivalents to the KTC4075-BL-TP. Both parts maintain identical specifications across all critical parameters: 50 V breakdown voltage, 150 mA collector current, 100 mW power dissipation, 80 MHz transition frequency, and matching saturation voltage characteristics. Both devices carry Active product status and ROHS3 compliance. The 2SC4116-BL,LF is packaged in Tape & Reel format with 24,300 units in stock, while the 2SC4116-BL,LXHF is also in Tape & Reel format with 7,067 units available. These parts are pin-compatible and require no circuit modifications.

Alternative Substitutes (Conditional):

The 2PC4081R,115 (Nexperia USA Inc.) and 2PC4081S,135 (NXP USA Inc.) are functionally compatible alternatives with Active product status and AEC-Q101 automotive qualification. These parts share the 50 V voltage rating and 150 mA current rating but feature increased power dissipation (200 mW versus 100 mW) and higher transition frequency (100 MHz versus 80 MHz). The saturation voltage differs at 400 mV @ 5 mA, 50 mA compared to the original 250 mV @ 10 mA, 100 mA specification. These parts are suitable for applications where the higher power rating and frequency capability provide design margin. The 2PC4081R,115 contains 40,817 units in stock, and the 2PC4081S,135 contains 160,943 units in stock.

Not Recommended for New Designs:

The 2SC4081T106R manufactured by Rohm Semiconductor carries a Not For New Designs product status and is therefore unsuitable for ongoing production applications despite its technical compatibility. This part exhibits the highest transition frequency (180 MHz) and is packaged in UMT3 format rather than standard SC-70 or SOT-323, introducing potential mechanical incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4116-BL,LF directly replace the KTC4075-BL-TP without circuit modifications?

A: Yes. The 2SC4116-BL,LF is a direct electrical and mechanical equivalent. All critical parameters match: 50 V breakdown voltage, 150 mA collector current, 100 mW power dissipation, 80 MHz transition frequency, and identical saturation voltage specifications. The part is pin-compatible in the SC-70 package configuration. No circuit modifications are required.

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

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format designation (LF versus LXHF), which may reflect different supplier or tape configuration specifications. Both are Active status products from Toshiba Semiconductor and Storage with identical electrical performance.

Q: Why do the 2PC4081 series parts have higher power dissipation (200 mW) than the original KTC4075-BL-TP (100 mW)?

A: The 2PC4081 series parts are designed with higher power handling capability, which provides additional thermal margin in applications. The increased power rating does not affect compatibility in circuits designed for the original 100 mW specification. However, the saturation voltage differs (400 mV versus 250 mV), which may impact switching speed and power efficiency in specific circuit topologies.

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

A: Yes. Both the 2PC4081R,115 and 2PC4081S,135 carry AEC-Q101 automotive qualification and are designated as automotive-grade components. These parts are suitable for automotive and industrial applications requiring enhanced reliability standards.

Q: What is the significance of the different package designations (SOT-323, SC-70, UMT3)?

A: SOT-323 and SC-70 are equivalent package designations for the same physical form factor and pin configuration. Both the KTC4075-BL-TP and substitute parts use this standard surface-mount package. The UMT3 package used by the 2SC4081T106R is a different physical configuration and is not mechanically compatible with standard SC-70 or SOT-323 footprints.

Q: Why is the 2SC4081T106R marked as Not For New Designs?

A: The Not For New Designs status indicates that the manufacturer has discontinued active support and development for this part. While the part may remain available in inventory, it is not recommended for new circuit designs or ongoing production applications. The 2SC4116-BL,LF or 2PC4081 series parts are preferred alternatives with Active product status.

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

A: The KTC4075-BL-TP and 2SC4116 series specify hFE of 350 @ 2 mA, 6 V. The 2PC4081R,115 specifies 180 @ 1 mA, 6 V, while the 2PC4081S,135 specifies 270 @ 1 mA, 6 V. These differences reflect different measurement conditions and part design. For most general-purpose switching applications, these variations are not critical. Applications requiring specific gain characteristics should verify compatibility with circuit requirements.

Q: Is the KTC4075-BL-TP still available for purchase?

A: The KTC4075-BL-TP is listed as Obsolete with 1,096 units in current stock. Once inventory is depleted, the part will no longer be available. The 2SC4116-BL,LF (24,300 units) and 2SC4116-BL,LXHF (7,067 units) are recommended as direct replacements with Active product status and significantly higher inventory availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance status of the original KTC4075-BL-TP. All parts are suitable for applications requiring RoHS3 compliance.

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