KTC4373-O-TP Equivalent & Substitute Parts

Part Overview

The KTC4373-O-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-89 package. This component operates at 120V collector-emitter breakdown voltage with a maximum collector current of 800 mA and 500 mW power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

KTC4373-O-TP

Micro Commercial CoIn Stock: 1100KTC4373-O-TP Datasheet

Current PartRFQ

2SC2881-O-TP

Micro Commercial CoIn Stock: 8882SC2881-O-TP Datasheet

DirectRFQ

2SCR372P5T100Q

Rohm SemiconductorIn Stock: 103242SCR372P5T100Q Datasheet

SimilarRFQ

2SCR372P5T100R

Rohm SemiconductorIn Stock: 34552SCR372P5T100R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KTC4373-O-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 120 V minimum
• Current - Collector (Ic) (Max): 800 mA minimum
• Package / Case: TO-243AA (SOT-89 supplier package)
• Mounting Type: Surface Mount
• Operating Temperature: 150°C (TJ) minimum

Secondary Compatibility Parameters:

• DC Current Gain (hFE): 80 minimum @ 100mA, 5V
• Vce Saturation: 1V maximum @ 50mA, 500mA
• Current - Collector Cutoff (Max): 100nA (ICBO) maximum
• RoHS3 Compliance

The substitute parts identified meet or exceed these parameters. The 2SC2881-O-TP provides direct equivalence with increased power rating (1 W vs 500 mW). The 2SCR372P5T100Q and 2SCR372P5T100R variants from Rohm Semiconductor operate at reduced collector current (700 mA vs 800 mA) and feature enhanced transition frequency (220 MHz vs 120 MHz), maintaining full electrical compatibility within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

2SC2881-O-TP (Micro Commercial Co): This part provides the closest functional equivalence to the KTC4373-O-TP, maintaining identical electrical specifications while offering increased power dissipation capability (1 W vs 500 mW). The 2SC2881-O-TP is classified as active product status with ROHS3 compliance and REACH unaffected designation, ensuring long-term availability and regulatory compliance for new designs and production continuity.

2SCR372P5T100Q and 2SCR372P5T100R (Rohm Semiconductor): Both variants operate at reduced maximum collector current (700 mA vs 800 mA) and feature superior transition frequency performance (220 MHz vs 120 MHz). These parts are active products with ROHS3 compliance and REACH unaffected status. The reduced collector current specification requires circuit analysis to confirm compatibility with existing designs. The enhanced DC current gain (120 vs 80) and improved saturation voltage characteristics (300mV vs 1V) provide performance advantages in switching applications. Both parts are available in Cut Tape and Digi-Reel packaging formats.

Selection between these alternatives depends on application requirements: the 2SC2881-O-TP for direct replacement with enhanced thermal performance, or the 2SCR372 variants for applications where the 700 mA collector current rating is sufficient and higher frequency performance is beneficial.

Frequently Asked Questions (FAQ)

Q: Can the 2SC2881-O-TP directly replace the KTC4373-O-TP in existing designs?

A: Yes. The 2SC2881-O-TP maintains identical electrical specifications for voltage, current, frequency, and gain parameters. The increased power rating (1 W vs 500 mW) provides additional thermal margin without affecting circuit operation. Both parts use the TO-243AA package in SOT-89 supplier format with identical pinout and mounting requirements.

Q: What is the primary difference between the 2SCR372P5T100Q/R variants and the original KTC4373-O-TP?

A: The 2SCR372 variants operate at 700 mA maximum collector current compared to 800 mA for the KTC4373-O-TP. Applications requiring the full 800 mA specification must use either the KTC4373-O-TP or 2SC2881-O-TP. The 2SCR372 variants offer superior transition frequency (220 MHz vs 120 MHz) and improved saturation voltage characteristics (300mV vs 1V).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The KTC4373-O-TP, 2SC2881-O-TP, 2SCR372P5T100Q, and 2SCR372P5T100R are all ROHS3 compliant. The 2SC2881-O-TP, 2SCR372P5T100Q, and 2SCR372P5T100R carry REACH unaffected designation, confirming regulatory compliance for European market applications.

Q: What packaging options are available for substitute parts?

A: The 2SC2881-O-TP is supplied in Tape & Reel (TR) format. The 2SCR372P5T100Q and 2SCR372P5T100R are available in Cut Tape (CT) and Digi-Reel packaging formats. All parts maintain the TO-243AA package specification with SOT-89 supplier device package designation.

Q: Can the 2SCR372 variants be used in applications requiring 800 mA collector current?

A: No. The 2SCR372 variants are rated for 700 mA maximum collector current. Applications requiring the full 800 mA specification must use the KTC4373-O-TP or 2SC2881-O-TP. Circuit analysis is required to confirm that 700 mA operation is acceptable for the intended application.

Q: What is the inventory status of these substitute parts?

A: The 2SC2881-O-TP has 821 pieces in stock. The 2SCR372P5T100Q has 10,300 pieces in stock. The 2SCR372P5T100R has 3,400 pieces in stock. The original KTC4373-O-TP has 1,087 pieces in stock but is classified as obsolete product.

Q: Are there differences in DC current gain between the main part and substitutes?

A: Yes. The KTC4373-O-TP and 2SC2881-O-TP specify minimum DC current gain of 80 @ 100mA, 5V. The 2SCR372P5T100Q and 2SCR372P5T100R specify minimum DC current gain of 120 @ 100mA, 5V. The higher gain in the Rohm variants may affect circuit biasing and requires design verification.