DTA143ECA-TP Equivalent & Substitute Parts

Part Overview

The DTA143ECA-TP is a pre-biased PNP bipolar junction transistor (BJT) manufactured by Micro Commercial Co in SOT-23 surface mount packaging. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 250 MHz transition frequency. The device is designed for applications requiring integrated base bias resistors (4.7 kOhms each), eliminating the need for external biasing networks in switching and amplification circuits.

The DTA143ECA-TP maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are necessary when addressing supply constraints, packaging format requirements, or application-specific current and gain specifications that differ from the original design parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Pre-Biased	—
Collector Current (Ic) Maximum	100	mA
Collector-Emitter Breakdown Voltage (Vceo)	50	V
Base Resistor (R1)	4.7	kOhms
Emitter-Base Resistor (R2)	4.7	kOhms
DC Current Gain (hFE) Minimum	30	@ 10mA, 5V
Vce Saturation Maximum	300	mV @ 500µA, 10mA
Transition Frequency	250	MHz
Power Dissipation Maximum	200	mW
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the DTA143ECA-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor polarity (PNP - Pre-Biased)
Collector-emitter breakdown voltage (50 V minimum)
Maximum collector current rating (100 mA or higher)
Transition frequency (250 MHz or higher)
Power dissipation capability (200 mW or higher)
Surface mount package compatibility (SOT-23-3 or equivalent)

Secondary Substitution Criteria:

Base and emitter-base resistor values (determines switching speed and gain characteristics)
DC current gain (hFE) specifications
Saturation voltage characteristics
Packaging format (Tape & Reel vs. Cut Tape)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents — Parts maintaining identical or superior electrical specifications with 4.7 kOhms base resistors, 100 mA collector current, and 250 MHz transition frequency.

Category 2: Application-Specific Alternatives — Parts with modified base resistor values (1 kOhms to 100 kOhms) and reduced collector current ratings (20 mA to 500 mA) for specialized circuit requirements while maintaining 50 V breakdown voltage and SOT-23-3 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vceo (V)	R1/R2 (kOhms)	hFE Min @ Ic, Vce	Vce Sat Max (mV)	Fт (MHz)	Package	Packaging Format
DTA143ECA-TP	Micro Commercial Co	100	50	4.7 / 4.7	30 @ 10mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Tape & Reel
DDTA143ECA-7-F	Diodes Incorporated	100	50	4.7 / 4.7	20 @ 10mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Tape & Reel
DTA143EKAT146	Rohm Semiconductor	100	50	4.7 / 4.7	30 @ 10mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Cut Tape & Digi-Reel
DTA123EKAT146	Rohm Semiconductor	100	50	2.2 / 2.2	20 @ 20mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Cut Tape & Digi-Reel
DTA124EKAT146	Rohm Semiconductor	30	50	22 / 22	56 @ 5mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Cut Tape & Digi-Reel
DTA114EKAT146	Rohm Semiconductor	50	50	10 / 10	30 @ 5mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Cut Tape & Digi-Reel
DTA115EKAT146	Rohm Semiconductor	20	50	100 / 100	82 @ 5mA, 5V	300 @ 250µA, 5mA	250	SOT-23-3	Cut Tape & Digi-Reel
DTA144EKAT146	Rohm Semiconductor	30	50	47 / 47	68 @ 5mA, 5V	300 @ 500µA, 10mA	250	SOT-23-3	Cut Tape & Digi-Reel
DTB113EKT146	Rohm Semiconductor	500	50	1 / 1	33 @ 50mA, 5V	300 @ 2.5mA, 50mA	200	SOT-23-3	Cut Tape & Digi-Reel
DTB114EKT146	Rohm Semiconductor	500	50	10 / 10	56 @ 50mA, 5V	300 @ 2.5mA, 50mA	200	SOT-23-3	Cut Tape & Digi-Reel
DTB123EKT146	Rohm Semiconductor	500	50	2.2 / 2.2	39 @ 50mA, 5V	300 @ 2.5mA, 50mA	200	SOT-23-3	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

The DTA143EKAT146 (Rohm Semiconductor) provides direct electrical equivalence to the DTA143ECA-TP with matching 100 mA collector current, 4.7 kOhms base resistors, 30 minimum hFE, and 250 MHz transition frequency. Both devices maintain RoHS3 compliance and unlimited moisture sensitivity. Selection between these parts depends on packaging format availability: the original uses Tape & Reel format while the substitute uses Cut Tape & Digi-Reel format.

The DDTA143ECA-7-F (Diodes Incorporated) maintains identical electrical ratings and SOT-23-3 packaging in Tape & Reel format. The minimum hFE specification is reduced to 20 (versus 30 for the original), which represents a lower guaranteed gain but remains suitable for applications not requiring the higher gain specification.

Current-Limited Alternatives:

The DTA114EKAT146 (Rohm Semiconductor) operates at 50 mA maximum collector current with 10 kOhms base resistors. This part is suitable for applications where the full 100 mA capability is not required and where higher base resistance improves switching characteristics.

The DTA115EKAT146 (Rohm Semiconductor) provides 20 mA maximum collector current with 100 kOhms base resistors and 82 minimum hFE. This configuration is appropriate for low-current switching applications requiring high input impedance.

Higher Current Capability:

The DTB113EKT146, DTB114EKT146, and DTB123EKT146 (all Rohm Semiconductor) support 500 mA collector current with transition frequencies of 200 MHz. These parts accommodate applications requiring substantially higher current handling while maintaining 50 V breakdown voltage and SOT-23-3 package compatibility. The reduced transition frequency (200 MHz versus 250 MHz) reflects the higher current capability design.

Compliance and Availability:

All substitute parts maintain Active product status, RoHS3 compliance, and unlimited moisture sensitivity rating (MSL 1). Selection should account for inventory availability and packaging format requirements specific to manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the DDTA143ECA-7-F replace the DTA143ECA-TP in all applications?

A: The DDTA143ECA-7-F provides electrical substitution with identical collector current (100 mA), breakdown voltage (50 V), base resistor values (4.7 kOhms), and transition frequency (250 MHz). The minimum hFE specification is 20 versus 30 for the original part. Applications requiring the guaranteed 30 minimum hFE should verify that the lower specification does not impact circuit performance. Both parts use SOT-23-3 packaging and maintain RoHS3 compliance.

Q: What is the difference between DTA143EKAT146 and DTA143ECA-TP?

A: The DTA143EKAT146 (Rohm Semiconductor) and DTA143ECA-TP (Micro Commercial Co) are electrically identical with matching 100 mA collector current, 4.7 kOhms base resistors, 30 minimum hFE, and 250 MHz transition frequency. The primary difference is packaging format: the original uses Tape & Reel (TR) format while the substitute uses Cut Tape & Digi-Reel format. Both maintain SOT-23-3 package type and RoHS3 compliance.

Q: When should I use DTA114EKAT146 instead of DTA143ECA-TP?

A: The DTA114EKAT146 is appropriate when the application requires 50 mA or less collector current and benefits from higher base resistance (10 kOhms versus 4.7 kOhms). The higher base resistance reduces base current requirements and improves switching speed in low-current applications. The 50 V breakdown voltage and SOT-23-3 package remain compatible with DTA143ECA-TP designs.

Q: What are the DTB series parts used for?

A: The DTB113EKT146, DTB114EKT146, and DTB123EKT146 are designed for applications requiring 500 mA collector current capability. These parts maintain 50 V breakdown voltage and SOT-23-3 packaging but operate at 200 MHz transition frequency (versus 250 MHz for DTA series). Selection of DTB parts is necessary when the original 100 mA rating is insufficient for the application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the compliance profile of the DTA143ECA-TP.

Q: Can I use DTA115EKAT146 in a circuit designed for DTA143ECA-TP?

A: The DTA115EKAT146 operates at 20 mA maximum collector current with 100 kOhms base resistors and 82 minimum hFE. This part is suitable only for applications where the collector current requirement does not exceed 20 mA. The significantly higher base resistance and gain characteristics make this part appropriate for different circuit topologies than those designed for the 100 mA, 4.7 kOhms DTA143ECA-TP.

Q: What packaging formats are available for substitutes?

A: The DTA143ECA-TP uses Tape & Reel (TR) format. Substitute parts from Rohm Semiconductor (DTA143EKAT146, DTA114EKAT146, DTA115EKAT146, DTA123EKAT146, DTA124EKAT146, DTB113EKT146, DTB114EKT146, DTB123EKT146) use Cut Tape & Digi-Reel format. The DDTA143ECA-7-F from Diodes Incorporated uses Tape & Reel format. All parts maintain SOT-23-3 package type compatibility.

Q: How do base resistor values affect circuit performance?

A: Base resistor values determine the input impedance and switching characteristics of the pre-biased transistor. Lower values (1 kOhms to 2.2 kOhms) provide faster switching and lower input impedance, suitable for high-current applications. Higher values (22 kOhms to 100 kOhms) increase input impedance and reduce base current requirements, appropriate for low-current or high-impedance source applications. The DTA143ECA-TP uses 4.7 kOhms, providing moderate input impedance and switching speed.

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