DTC115GKAT146 Pre-Biased NPN Transistor Equivalent & Substitute Parts

Part Overview

The DTC115GKAT146 is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Rohm Semiconductor in the DTC115G series. This surface mount device operates at 50 V maximum collector-emitter breakdown voltage with a maximum collector current of 100 mA and 200 mW power dissipation. The device features a 100 kOhm base resistor and is packaged in SMT3 (SOT-23-3) configuration on tape and reel.

The DTC115GKAT146 carries a "Not For New Designs" status, indicating that Rohm Semiconductor has discontinued active development for this part number. This status necessitates identification of functionally equivalent alternatives from active product lines to ensure design continuity and supply chain reliability for both new applications and legacy system support.

Key Parameters

Parameter	Value	Unit	Specification Basis
Transistor Type	NPN - Pre-Biased	—	Functional classification
Maximum Collector Current (Ic)	100	mA	Current handling capacity
Maximum Collector-Emitter Breakdown Voltage (Vceo)	50	V	Voltage rating
Base Resistor (R1)	100	kOhms	Internal bias network
DC Current Gain (hFE) @ Ic, Vce	82 @ 5mA, 5V	—	Amplification characteristic
Vce Saturation (Max) @ Ib, Ic	300mV @ 250µA, 5mA	mV	Saturation performance
Collector Cutoff Current (ICBO)	500	nA	Leakage specification
Transition Frequency (fT)	250	MHz	High-frequency capability
Maximum Power Dissipation	200	mW	Thermal rating
Package / Case	TO-236-3, SC-59, SOT-23-3	—	Physical form factor
Mounting Type	Surface Mount	—	Assembly method
RoHS Status	ROHS3 Compliant	—	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—	Handling requirement

Substitute Part Grouping Explanation

Substitution of the DTC115GKAT146 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor type: NPN pre-biased configuration
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 50 V
Package form factor: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface mount
Base resistor value: 100 kOhms (or functionally equivalent internal bias network)

Secondary Compatibility Factors:

DC current gain (hFE) minimum specification at rated conditions
Vce saturation voltage at specified bias points
Transition frequency: 250 MHz
Power dissipation rating: 200 mW or greater
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or functionally equivalent base resistor values (100 kOhms) and matching electrical performance specifications. These parts provide pin-for-pin compatibility with minimal or no circuit redesign.

Functional Alternatives: Parts with different internal bias resistor networks (such as 10 kOhms, 22 kOhms, or 2.2 kOhms base resistors) that maintain the same voltage and current ratings but exhibit different gain characteristics. These parts require circuit evaluation to confirm suitability for the specific application bias conditions.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vceo (Max) V	Base Resistor (kOhms)	hFE @ Ic, Vce	Vce Sat (Max) mV	fT (MHz)	Power (mW)	Package	Status
DTC115GKAT146	Rohm Semiconductor	100	50	100	82 @ 5mA, 5V	300 @ 250µA, 5mA	250	200	SOT-23-3	Not For New Designs
DDTC115GCA-7-F	Diodes Incorporated	100	50	100	82 @ 5mA, 5V	300 @ 500µA, 10mA	250	200	SOT-23-3	Active
DDTC115TCA-7	Diodes Incorporated	100	50	—	—	—	—	200	SOT-23-3	Active
PDTC115TT,215	Nexperia USA Inc.	100	50	100	100 @ 1mA, 5V	150 @ 250µA, 5mA	—	250	SOT-23-3	Active
DDTC113TCA-7-F	Diodes Incorporated	100	50	1	100 @ 1mA, 5V	300 @ 1mA, 10mA	250	200	SOT-23-3	Active
DDTC114GCA-7-F	Diodes Incorporated	100	50	10	30 @ 5mA, 5V	300 @ 500µA, 10mA	250	200	SOT-23-3	Active
DDTC114TCA-7-F	Diodes Incorporated	100	50	10	100 @ 1mA, 5V	300 @ 100µA, 1mA	250	200	SOT-23-3	Active
DDTC123JCA-7-F	Diodes Incorporated	100	50	2.2 (R1), 47 (R2)	80 @ 10mA, 5V	300 @ 250µA, 5mA	250	200	SOT-23-3	Active
DDTC123TCA-7-F	Diodes Incorporated	100	50	2.2	100 @ 1mA, 5V	300 @ 500µA, 5mA	250	200	SOT-23-3	Active
DDTC124GCA-7-F	Diodes Incorporated	100	50	22	56 @ 5mA, 5V	300 @ 500µA, 10mA	250	200	SOT-23-3	Active
DDTC124TCA-7-F	Diodes Incorporated	100	50	22	100 @ 1mA, 5V	300 @ 500µA, 5mA	250	200	SOT-23-3	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

The DDTC115GCA-7-F (Diodes Incorporated) is the primary direct substitute for the DTC115GKAT146. Both devices share identical maximum ratings (100 mA, 50 V), matching base resistor value (100 kOhms), and equivalent DC current gain specification (82 @ 5mA, 5V). The DDTC115GCA-7-F is in active production status with RoHS3 compliance and MSL 1 rating, ensuring long-term supply availability and regulatory compliance. The part is available in high inventory (60,200 units) and maintains the same SOT-23-3 package form factor.

The PDTC115TT,215 (Nexperia USA Inc.) provides an alternative direct equivalent with identical voltage and current ratings and matching 100 kOhm base resistor. This part exhibits higher DC current gain (100 @ 1mA, 5V) and lower saturation voltage (150 mV @ 250µA, 5mA) compared to the original specification, resulting in improved switching performance. The PDTC115TT,215 is active production with RoHS3 compliance and 250 mW power rating.

Functional Alternatives (Application-Dependent Selection):

Parts with different internal bias resistor networks (DDTC113TCA-7-F, DDTC114GCA-7-F, DDTC114TCA-7-F, DDTC123JCA-7-F, DDTC123TCA-7-F, DDTC124GCA-7-F, DDTC124TCA-7-F) maintain the same voltage and current ratings but exhibit different gain characteristics determined by their base resistor values. Selection among these alternatives requires circuit-level evaluation to confirm that the bias network and gain characteristics are compatible with the intended application.

All substitute parts listed carry active production status, RoHS3 compliance, and MSL 1 rating, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q1: Can the DDTC115GCA-7-F be used as a direct pin-for-pin replacement for the DTC115GKAT146?

A: Yes. The DDTC115GCA-7-F is a direct pin-for-pin equivalent. Both devices feature identical maximum ratings (100 mA collector current, 50 V breakdown voltage), matching 100 kOhm base resistor, and equivalent DC current gain (82 @ 5mA, 5V). The SOT-23-3 package pinout is identical. No circuit modifications are required.

Q2: What is the difference between parts with different base resistor values (100 kOhms vs. 10 kOhms vs. 22 kOhms)?

A: The internal base resistor value determines the bias network characteristics and affects the DC current gain and switching behavior. The DTC115GKAT146 uses a 100 kOhm base resistor. Parts such as DDTC114GCA-7-F (10 kOhms) or DDTC124TCA-7-F (22 kOhms) have different gain characteristics and require circuit evaluation to confirm compatibility. Direct substitution is not recommended without circuit analysis.

Q3: Why is the DTC115GKAT146 marked "Not For New Designs"?

A: This status indicates that Rohm Semiconductor has discontinued active development and marketing of this part number. Manufacturers assign this status to encourage migration to active product lines. The part remains available in existing inventory but is not recommended for new circuit designs. Active alternatives such as DDTC115GCA-7-F or PDTC115TT,215 should be used for new applications.

Q4: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference carry RoHS3 compliance certification, meeting current environmental and regulatory requirements for electronic components.

Q5: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level. These components have unlimited shelf life under normal storage conditions and do not require special moisture-control handling procedures during assembly or storage.

Q6: Can I use PDTC115TT,215 instead of DDTC115GCA-7-F?

A: Yes, both are functionally equivalent direct replacements for the DTC115GKAT146. The PDTC115TT,215 offers improved performance characteristics (higher gain and lower saturation voltage) and is suitable for applications where these enhanced specifications are beneficial or neutral. Both parts are in active production with identical voltage and current ratings.

Q7: What is the difference between "Direct Equivalent" and "Functional Alternative" substitutes?

A: Direct equivalents (such as DDTC115GCA-7-F and PDTC115TT,215) have matching or functionally equivalent base resistor values and can typically be substituted without circuit modification. Functional alternatives have different internal bias resistor networks and require circuit-level evaluation to confirm that the gain characteristics and bias conditions are compatible with the specific application.

Q8: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly among substitute parts. DDTC123TCA-7-F has the highest inventory (50,200 units), while DDTC124GCA-7-F has lower availability (718 units). For high-volume production or long-term supply assurance, parts with higher inventory levels may be preferred.

Q9: Do all substitute parts use the same SOT-23-3 package?

A: Yes. All substitute parts listed in this reference use the SOT-23-3 package form factor (also designated TO-236-3 or SC-59). This ensures mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q10: What should I verify before finalizing a substitution?

A: Verify that the substitute part's DC current gain (hFE), saturation voltage (Vce Sat), and internal bias resistor network are compatible with your circuit's bias point and switching requirements. Confirm that the part is in active production status and meets your supply chain and compliance requirements. For functional alternatives with different base resistor values, perform circuit simulation or breadboard testing to validate performance.

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