DTC124ECA-TP Equivalent & Substitute Parts

Part Overview

The DTC124ECA-TP is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Micro Commercial Co in SOT-23 surface mount packaging. This component is classified as an active product and is RoHS3 compliant. The device integrates internal base and emitter resistors (22 kOhms each) to simplify circuit design in switching and amplification applications. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and internal resistor configurations to ensure functional interchangeability within specified application parameters.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the DTC124ECA-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN - Pre-Biased
Collector-Emitter Breakdown Voltage: 50 V (minimum requirement)
Maximum Collector Current: 100 mA (minimum requirement)
Internal Base Resistor (R1): 22 kOhms (exact match required for bias point stability)
Internal Emitter-Base Resistor (R2): 22 kOhms (exact match required for bias point stability)
DC Current Gain (hFE): 56 @ 5mA, 5V (minimum specification)
Vce Saturation: 300mV @ 500µA, 10mA (maximum specification)
Transition Frequency: 250 MHz (minimum requirement)
Power Dissipation: 200 mW (maximum specification)
Package: SOT-23-3 or equivalent surface mount form factor
Compliance: RoHS3 compliant, MSL 1

Direct Equivalents are parts that match all electrical and mechanical parameters exactly. These parts are functionally identical and require no circuit modifications.

Functional Substitutes are parts that meet or exceed the primary electrical specifications but may differ in secondary characteristics such as packaging variant, internal resistor values, or maximum current rating. Selection of functional substitutes requires verification that the application does not depend on the specific differing parameter.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	R1 (kOhms)	R2 (kOhms)	hFE Min @ Ic, Vce	Frequency (MHz)	Package	Packaging Type
DTC124ECA-TP	Micro Commercial Co	100	50	22	22	56 @ 5mA, 5V	250	SOT-23-3	Tape & Reel (TR)
DDTC124ECA-7-F	Diodes Incorporated	100	50	22	22	56 @ 5mA, 5V	250	SOT-23-3	Tape & Reel (TR)
DTC124ECAT116	Rohm Semiconductor	100	50	22	22	56 @ 5mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTC124EKAT146	Rohm Semiconductor	30	50	22	22	56 @ 5mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTC123EKAT146	Rohm Semiconductor	100	50	2.2	2.2	20 @ 20mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTC114EKAT146	Rohm Semiconductor	50	50	10	10	30 @ 5mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTC115EKAT146	Rohm Semiconductor	20	50	100	100	82 @ 5mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTC143EKAT146	Rohm Semiconductor	100	50	4.7	4.7	30 @ 10mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTC144EKAT146	Rohm Semiconductor	100	50	47	47	68 @ 5mA, 5V	250	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTD113EKT146	Rohm Semiconductor	500	50	1	1	33 @ 50mA, 5V	200	SOT-23-3	Cut Tape (CT) & Digi-Reel®
DTD114EKT146	Rohm Semiconductor	500	50	10	10	56 @ 50mA, 5V	200	SOT-23-3	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Direct Equivalent (Pin-for-Pin Compatible):

The DDTC124ECA-7-F manufactured by Diodes Incorporated is a direct equivalent to the DTC124ECA-TP. This part matches all electrical specifications, internal resistor values, and package configuration. Both parts are RoHS3 compliant with MSL 1 rating. The DDTC124ECA-7-F is available in higher inventory (6100 pcs) and is suitable for direct substitution without circuit modification.

The DTC124ECAT116 manufactured by Rohm Semiconductor is also a direct electrical equivalent with identical specifications. This part differs only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and is suitable for applications where packaging format is not a constraint.

Functional Substitutes with Internal Resistor Variations:

Parts with different internal resistor values (DTC123EKAT146, DTC114EKAT146, DTC115EKAT146, DTC143EKAT146, DTC144EKAT146) are functionally compatible only in applications where the bias network is not dependent on the specific 22 kOhm resistor values. These parts maintain the 50 V breakdown voltage, SOT-23-3 package, and surface mount compatibility. Selection requires circuit analysis to confirm that the altered bias point does not affect application performance.

Functional Substitutes with Higher Current Capability:

The DTD113EKT146 and DTD114EKT146 provide maximum collector currents of 500 mA, exceeding the DTC124ECA-TP specification of 100 mA. These parts are suitable for applications requiring higher current handling. However, the transition frequency is reduced to 200 MHz (versus 250 MHz), and internal resistor values differ significantly. These parts are appropriate only when higher current capability is required and frequency performance is not a limiting factor.

Reduced Current Capability Substitutes:

The DTC124EKAT146 (30 mA max) and DTC115EKAT146 (20 mA max) provide reduced current ratings. These parts are suitable only for applications where the required collector current does not exceed their maximum specifications.

All recommended substitutes maintain RoHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can DDTC124ECA-7-F be used as a direct replacement for DTC124ECA-TP?

A: Yes. The DDTC124ECA-7-F is a direct equivalent with identical electrical specifications, internal resistor values (22 kOhms each), maximum collector current (100 mA), and transition frequency (250 MHz). The only difference is the manufacturer (Diodes Incorporated versus Micro Commercial Co) and packaging format (Tape & Reel). No circuit modifications are required.

Q: What is the significance of the internal resistor values (R1 and R2)?

A: The internal base and emitter-base resistors determine the bias point of the pre-biased transistor. The DTC124ECA-TP has 22 kOhm resistors, which establish a specific bias network. Substituting a part with different resistor values (such as DTC123EKAT146 with 2.2 kOhm resistors) will alter the bias point and may affect circuit performance. Substitution with different resistor values requires circuit analysis to confirm compatibility.

Q: Can DTC124EKAT146 (30 mA max) replace DTC124ECA-TP (100 mA max)?

A: DTC124EKAT146 can replace DTC124ECA-TP only if the application's maximum collector current requirement does not exceed 30 mA. Both parts have identical internal resistor values (22 kOhms) and transition frequency (250 MHz). If the application requires collector currents between 30 mA and 100 mA, DTC124EKAT146 is not suitable.

Q: What is the difference between SOT-23 and SOT-23-3 packaging?

A: SOT-23 and SOT-23-3 refer to the same three-terminal surface mount package (TO-236-3, SC-59). The designation is interchangeable. All substitute parts listed are compatible with the same PCB footprint and reflow soldering process.

Q: Are DTD113EKT146 and DTD114EKT146 suitable substitutes?

A: DTD113EKT146 and DTD114EKT146 are suitable only if the application requires collector currents up to 500 mA. These parts have significantly different internal resistor values (1 kOhm and 10 kOhm respectively, versus 22 kOhm in the DTC124ECA-TP) and reduced transition frequency (200 MHz versus 250 MHz). Substitution requires verification that the altered bias point and reduced frequency performance do not affect application requirements.

Q: What does RoHS3 compliance mean for substitution?

A: RoHS3 compliance indicates that the part meets Restriction of Hazardous Substances regulations. All listed substitute parts are RoHS3 compliant, ensuring compatibility with standard manufacturing processes and environmental requirements. Compliance status does not affect electrical interchangeability.

Q: Can I use DTC115EKAT146 (20 mA max) in a circuit designed for DTC124ECA-TP (100 mA max)?

A: DTC115EKAT146 can be used only if the application's maximum collector current does not exceed 20 mA. Additionally, DTC115EKAT146 has 100 kOhm internal resistors (versus 22 kOhm), which will significantly alter the bias point. Substitution requires both current and bias point verification.

Q: What inventory considerations should guide part selection?

A: Inventory availability varies significantly among substitutes. DDTC124ECA-7-F has 6100 pcs available, while DTC124EKAT146 has 1,265,200 pcs. For high-volume production, parts with larger inventory may offer supply chain advantages. However, inventory should not override electrical compatibility requirements.

Q: Are there packaging format differences between substitutes?

A: Yes. DTC124ECA-TP is supplied in Tape & Reel (TR) format. Several Rohm Semiconductor substitutes are supplied in Cut Tape (CT) & Digi-Reel® format. Both formats are compatible with standard pick-and-place assembly equipment. Format selection depends on production volume and assembly line configuration.

Q: What is the Moisture Sensitivity Level (MSL) and why is it important?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions and does not require special storage or handling procedures. All listed substitute parts have MSL 1 rating, ensuring compatibility with standard warehouse and manufacturing environments.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message