DTA124ECA-TP Pre-Biased PNP Transistor Equivalent & Substitute Parts

Part Overview

The DTA124ECA-TP is an active pre-biased PNP bipolar junction transistor (BJT) manufactured by Micro Commercial Co in SOT-23 surface mount packaging. This component integrates internal base bias resistors (22 kΩ each) to simplify circuit design for switching and amplification applications. The device operates at 50 V collector-emitter breakdown voltage with 100 mA maximum collector current and 250 MHz transition frequency. Product status is Active with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching or compatible electrical specifications including collector current rating, voltage ratings, transition frequency, internal resistor values, and saturation characteristics. Substitutes enable design flexibility across multiple manufacturers and packaging formats while maintaining functional equivalence within specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Pre-Biased	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Resistor - Base (R1)	22	kΩ
Resistor - Emitter Base (R2)	22	kΩ
DC Current Gain (hFE) Min @ Ic, Vce	56 @ 5mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	300	mV @ 500µA, 10mA
Current - Collector Cutoff (Max)	500	nA
Frequency - Transition	250	MHz
Power - Max	200	mW
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the DTA124ECA-TP are classified into two primary categories based on electrical and mechanical compatibility:

Category 1: Direct Electrical Equivalents Parts matching all critical electrical parameters including 100 mA collector current, 50 V breakdown voltage, 22 kΩ internal base resistors, 56 hFE minimum gain, and 250 MHz transition frequency. These parts maintain identical functional behavior in circuit applications.

Category 2: Functional Alternatives with Modified Parameters Parts with different internal resistor values, reduced collector current ratings, or modified gain characteristics. These parts operate within the same voltage and frequency envelope but require circuit evaluation for specific application requirements.

Key Substitution Parameters:

Collector current rating (Ic Max): 100 mA baseline; lower ratings acceptable for current-limited applications
Internal resistor values (R1, R2): 22 kΩ baseline; alternative values affect bias point and switching speed
DC current gain (hFE): 56 minimum baseline; variations affect drive requirements
Voltage rating (Vce breakdown): 50 V fixed across all substitutes
Transition frequency: 250 MHz baseline; 200 MHz acceptable for lower-speed applications
Package compatibility: SOT-23-3 / SMT3 mechanical equivalence

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	R1 (kΩ)	R2 (kΩ)	hFE Min @ Ic, Vce	Vce Sat (mV)	Freq (MHz)	Package
DTA124ECA-TP	Micro Commercial Co	100	22	22	56 @ 5mA, 5V	300	250	SOT-23
DDTA124ECA-7-F	Diodes Incorporated	100	22	22	56 @ 5mA, 5V	300	250	SOT-23-3
DTA114EKAT146	Rohm Semiconductor	50	10	10	30 @ 5mA, 5V	300	250	SMT3
DTA115EKAT146	Rohm Semiconductor	20	100	100	82 @ 5mA, 5V	300	250	SMT3
DTA123EKAT146	Rohm Semiconductor	100	2.2	2.2	20 @ 20mA, 5V	300	250	SMT3
DTA124EKAT146	Rohm Semiconductor	30	22	22	56 @ 5mA, 5V	300	250	SMT3
DTA143EKAT146	Rohm Semiconductor	100	4.7	4.7	30 @ 10mA, 5V	300	250	SMT3
DTA144EKAT146	Rohm Semiconductor	30	47	47	68 @ 5mA, 5V	300	250	SMT3
DTB113EKT146	Rohm Semiconductor	500	1	1	33 @ 50mA, 5V	300	200	SMT3
DTB114EKT146	Rohm Semiconductor	500	10	10	56 @ 50mA, 5V	300	200	SMT3
DTB123EKT146	Rohm Semiconductor	500	2.2	2.2	39 @ 50mA, 5V	300	200	SMT3

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance): The DDTA124ECA-7-F from Diodes Incorporated provides complete electrical equivalence to the DTA124ECA-TP with matching 100 mA collector current, 22 kΩ internal resistors, and 56 hFE gain specification. Both devices are Active status with ROHS3 compliance and MSL 1 rating. Packaging is mechanically compatible (SOT-23 / SOT-23-3). This part is suitable for one-to-one replacement without circuit modification.

Reduced Current Applications (50 mA and Below): The DTA114EKAT146 (50 mA) and DTA124EKAT146 (30 mA) from Rohm Semiconductor operate within the same voltage and frequency envelope. The DTA114EKAT146 features 10 kΩ internal resistors and 30 hFE minimum gain, requiring evaluation for drive current compatibility. The DTA124EKAT146 maintains 22 kΩ resistors matching the original design but limits collector current to 30 mA. Both are Active status with ROHS3 compliance.

High Current Applications (500 mA): The DTB113EKT146, DTB114EKT146, and DTB123EKT146 from Rohm Semiconductor support 500 mA collector current with reduced internal resistor values (1 kΩ, 10 kΩ, and 2.2 kΩ respectively). Transition frequency is 200 MHz. These parts are suitable for higher-power switching applications but require circuit redesign due to modified bias resistor networks. All are Active status with ROHS3 compliance.

Specialized Bias Networks: The DTA115EKAT146 (20 mA, 100 kΩ resistors, 82 hFE) and DTA143EKAT146 (100 mA, 4.7 kΩ resistors, 30 hFE) and DTA144EKAT146 (30 mA, 47 kΩ resistors, 68 hFE) provide alternative bias configurations for specific circuit requirements. Selection depends on required bias point and switching characteristics.

All substitute parts maintain 50 V collector-emitter breakdown voltage, 300 mV saturation voltage, and 500 nA cutoff current specifications. All are RoHS3 compliant with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can the DDTA124ECA-7-F replace the DTA124ECA-TP in existing designs without modification? A: Yes. The DDTA124ECA-7-F provides complete electrical equivalence with identical collector current (100 mA), internal resistor values (22 kΩ), gain specification (56 hFE), and voltage ratings (50 V). Mechanical packaging is compatible (SOT-23-3). No circuit changes are required.

Q: What is the primary difference between DTA124EKAT146 and DTA124ECA-TP? A: The DTA124EKAT146 reduces maximum collector current from 100 mA to 30 mA while maintaining identical internal resistor values (22 kΩ) and gain specification (56 hFE). This part is suitable for lower-power applications. Both operate at 250 MHz and 50 V breakdown voltage.

Q: Why do DTB series parts (DTB113EKT146, DTB114EKT146, DTB123EKT146) have different internal resistor values? A: DTB series parts are designed for higher collector current operation (500 mA) and feature reduced internal resistor values to accommodate higher base drive requirements. The 1 kΩ, 10 kΩ, and 2.2 kΩ resistor networks provide different bias points for specific switching speed and drive current characteristics. These parts require circuit evaluation before substitution.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity) rating, matching the original DTA124ECA-TP specifications.

Q: What is the significance of the 250 MHz versus 200 MHz transition frequency difference? A: The 250 MHz transition frequency (DTA124ECA-TP, DTA series) supports faster switching applications compared to 200 MHz parts (DTB series). For applications requiring high-speed switching, 250 MHz parts are preferred. For lower-frequency applications, 200 MHz parts are functionally acceptable.

Q: Can DTA115EKAT146 (20 mA) be used in place of DTA124ECA-TP (100 mA)? A: No. The DTA115EKAT146 is rated for maximum 20 mA collector current, which is insufficient for applications requiring 100 mA operation. This part is suitable only for low-current applications. Additionally, the 100 kΩ internal resistor values differ significantly from the original 22 kΩ design.

Q: What packaging formats are available for substitutes? A: The original DTA124ECA-TP uses SOT-23 packaging. Substitute parts are available in SOT-23-3 and SMT3 formats, which are mechanically equivalent for surface mount assembly. All parts maintain TO-236-3 and SC-59 case designations.

Q: How do internal resistor values (R1, R2) affect circuit behavior? A: Internal resistor values determine the bias point and switching characteristics. Lower resistor values (1 kΩ, 2.2 kΩ) provide stronger base drive and faster switching but require higher input current. Higher resistor values (47 kΩ, 100 kΩ) reduce input current requirements but may slow switching response. The 22 kΩ baseline provides balanced performance for general-purpose applications.

Q: Are all substitute parts in Active product status? A: Yes. All listed substitute parts maintain Active product status, ensuring continued availability and manufacturer support.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message