Equivalent & Substitute Parts Reference: DTA115TKAT146

Part Overview

DTA115TKAT146 is a pre-biased PNP bipolar junction transistor (BJT) manufactured by Rohm Semiconductor, with a maximum collector-emitter voltage of 50V, collector current of 100mA, and integrated base resistor of 100kΩ. The device is provided in a surface mount SMT3 (TO-236-3, SC-59, SOT-23-3) package, rated for 200mW maximum power dissipation, and features 250MHz transition frequency. The product has been marked as "Not For New Designs," making it necessary to identify direct substitutes or equivalent alternatives for current and future design-in or maintenance applications.

Key Parameters

Parameter	Value
Transistor Type	PNP - Pre-Biased
Voltage - Collector Emitter Breakdown (Max)	50 V
Current - Collector (Ic) (Max)	100 mA
Power - Max	200 mW
Resistor - Base (R1)	100 kOhms
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1mA, 5V
Vce Saturation (Max) @ Ib, Ic	300mV @ 100µA, 1mA
Current - Collector Cutoff (Max)	500nA (ICBO)
Frequency - Transition	250 MHz
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution is strictly determined by matching the following electrical and mechanical parameters:

PNP pre-biased BJT type
Collector-emitter voltage rating (≥50 V)
Maximum collector current (≥100 mA)
Integrated base resistor (R1 ≈100 kΩ for direct equivalency)
Minimum DC current gain (hFE) and saturation specifications
Package: surface-mount, fitting TO-236-3, SC-59, or SOT-23-3 mechanical specifications
Power dissipation (≥200 mW)
Environmental compliance and moisture sensitivity (RoHS3, MSL 1, REACH)

Direct substitutes match all major parameters and pinout. Similar or upgrade parts offer slight variations within the bounds stated above.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	V_CE(Max)	I_C(Max)	Power Max	R1	hFE (Min) @ Ic,Vce	Vce(sat) (Max) @ Ib, Ic	ICBO (Max)	f_T	Mounting Type	Package / Case	RoHS	MSL	REACH
DTA115TKAT146	Rohm Semiconductor	PNP - Pre-Biased	50 V	100 mA	200 mW	100 kOhms	100 @ 1mA, 5V	300mV @ 100µA, 1mA	500nA	250 MHz	Surface Mount	TO-236-3, SC-59, SOT-23-3	ROHS3	1	Unaffected
DDTA115TCA-7-F	Diodes Inc.	PNP - Pre-Biased	50 V	100 mA	200 mW	100 kOhms	100 @ 1mA, 5V	300mV @ 100µA, 1mA	500nA	250 MHz	Surface Mount	TO-236-3, SC-59, SOT-23-3	ROHS3	1	Unaffected
MMUN2141LT1G	onsemi	PNP - Pre-Biased	50 V	100 mA	246 mW	100 kOhms	160 @ 5mA, 10V	250mV @ 300µA, 10mA	500nA	-	Surface Mount	TO-236-3, SC-59, SOT-23-3	ROHS3	1	Unaffected
MUN2141T1G	onsemi	PNP - Pre-Biased	50 V	100 mA	230 mW	100 kOhms	160 @ 5mA, 10V	250mV @ 300µA, 10mA	500nA	-	Surface Mount	TO-236-3, SC-59, SOT-23-3	ROHS3	1	Unaffected
PDTA115TT,215	Nexperia USA Inc.	PNP - Pre-Biased	50 V	100 mA	250 mW	100 kOhms	100 @ 1mA, 5V	150mV @ 250µA, 5mA	1µA	-	Surface Mount	TO-236-3, SC-59, SOT-23-3	ROHS3	1	Unaffected
DDTA115GCA-7-F	Diodes Inc.	PNP - Pre-Biased	50 V	100 mA	200 mW	100 kOhms (Emitter-Base: 100kΩ)	82 @ 5mA,5V	300mV @ 500µA,10mA	500nA	250 MHz	Surface Mount	TO-236-3, SC-59, SOT-23-3	ROHS3	1	Unaffected

Engineering Selection Recommendations

DTA115TKAT146 is classified as "Not For New Designs." Direct substitutes such as DDTA115TCA-7-F (Diodes Inc.), MMUN2141LT1G (onsemi), and MUN2141T1G (onsemi) match core functional and mechanical parameters. All listed options meet RoHS3, MSL 1, and REACH status, adhering to environmental and regulatory compliance requirements in this product category.

Frequently Asked Questions (FAQ)

Q1: What determines if a PNP pre-biased transistor is a substitute for DTA115TKAT146?
A1: Substitution is determined by matching transistor type (PNP pre-biased), collector-emitter voltage rating, maximum collector current, base resistor value, DC current gain, package type, and compliance statuses.

Q2: Can I substitute with a part that has a different base resistor (R1)?
A2: Only substitutes with the same R1 value (100 kOhms) as DTA115TKAT146 are considered direct equivalents. Other R1 values result in different biasing characteristics and are not direct substitutes.

Q3: Are all packages interchangeable?
A3: Only parts available in TO-236-3, SC-59, or SOT-23-3 surface mount packages are suitable substitutes due to matched mechanical footprints and pinouts.

Q4: Does the RoHS or MSL status impact substitutability?
A4: Substitutes must carry equivalent RoHS3 compliance, MSL 1 (Unlimited), and REACH unaffected status to ensure continued manufacturing, import, and environmental safety compatibility.

Q5: Are similar or upgrade parts with other resistor or gain values valid?
A5: Only direct parameter matches are considered substitutes for critical applications; parts with differing R1, hFE, or power dissipation values may not guarantee identical circuit performance.

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