DTC124EKA-TP Equivalent & Substitute Parts

Part Overview

The DTC124EKA-TP is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-23-3 package. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 250 MHz transition frequency. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

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
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

Substitution of the DTC124EKA-TP is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor type: NPN pre-biased configuration
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 50 V
Base and emitter-base resistor values: 22 kOhms each
Transition frequency: 250 MHz or higher
Power dissipation capability: 200 mW or greater

Mechanical Equivalence Criteria:

Surface mount package: SOT-23-3 (TO-236-3) or SC-59 compatible footprints
Moisture sensitivity level: MSL 1 or equivalent
RoHS3 compliance required

Regulatory Equivalence Criteria:

RoHS3 compliance
REACH unaffected status
ECCN EAR99 classification

Substitute parts are grouped into two categories: direct equivalents (identical electrical and package specifications) and compatible alternatives (equivalent electrical performance with different package designations that share compatible footprints).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	R1 / R2 kOhms	hFE Min @ Ic, Vce	Vce Sat (Max) @ Ib, Ic	Frequency MHz	Power (Max) mW	Package	Status
DTC124EKA-TP	Micro Commercial Co	100	50	22 / 22	56 @ 5mA, 5V	300mV @ 500µA, 10mA	250	200	SOT-23-3	Obsolete
DTC124ECAT116	Rohm Semiconductor	100	50	22 / 22	56 @ 5mA, 5V	300mV @ 500µA, 10mA	250	200	SST3	Active
MMUN2212LT1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250mV @ 300µA, 10mA	246	246	SOT-23-3	Active
MUN2212T1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250mV @ 300µA, 10mA	—	338	SC-59	Active
NSVMMUN2212LT1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250mV @ 300µA, 10mA	—	246	SOT-23-3	Active
NSVMUN2212T1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250mV @ 300µA, 10mA	—	230	SC-59	Active
PDTC124ET,215	Nexperia USA Inc.	100	50	22 / 22	60 @ 5mA, 5V	150mV @ 500µA, 10mA	—	250	TO-236AB	Active
PDTC124ET,235	NXP USA Inc.	100	50	22 / 22	60 @ 5mA, 5V	150mV @ 500µA, 10mA	—	250	SOT-23	Active
SMUN2212T1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250mV @ 300µA, 10mA	—	230	SC-59	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The PDTC124ET,235 (NXP USA Inc.) and PDTC124ET,215 (Nexperia USA Inc.) are the preferred direct substitutes for the DTC124EKA-TP. Both parts maintain identical electrical specifications including 100 mA collector current, 50 V breakdown voltage, 22 kOhm base and emitter-base resistors, and 250 mW power dissipation. Both are active products with RoHS3 compliance and MSL 1 rating. The PDTC124ET,235 is available in high inventory (60,735 units) in SOT-23 package, while PDTC124ET,215 is available in TO-236AB package with 20,001 units in stock.

Secondary Substitutes (Package-Compatible Alternatives):

The onsemi MMUN2212LT1G and NSVMMUN2212LT1G are functionally equivalent alternatives in SOT-23-3 package. Both maintain the required 100 mA collector current and 50 V breakdown voltage with 22 kOhm resistor configuration. These parts exhibit slightly improved saturation voltage characteristics (250 mV vs. 300 mV) and higher power ratings (246 mW), with extensive inventory availability (1,440 and 95,300 units respectively). Both are active products with full RoHS3 and MSL 1 compliance.

SC-59 Package Alternatives:

The MUN2212T1G, NSVMUN2212T1G, and SMUN2212T1G from onsemi provide electrical equivalence in SC-59 package format. These parts are suitable for applications where SC-59 footprint compatibility is required. All three maintain 100 mA collector current, 50 V breakdown voltage, and 22 kOhm resistor values. Power ratings range from 230 mW to 338 mW, exceeding the original 200 mW specification. All are active products with RoHS3 compliance.

Rohm Semiconductor Alternative:

The DTC124ECAT116 from Rohm Semiconductor provides direct electrical equivalence to the DTC124EKA-TP with identical specifications across all critical parameters. This part is packaged in SST3 format and is available in active status with 1,964 units in inventory. RoHS3 compliance and MSL 1 rating are maintained.

Frequently Asked Questions (FAQ)

Q: Can I use PDTC124ET,235 as a direct replacement for DTC124EKA-TP?

A: Yes. The PDTC124ET,235 maintains electrical equivalence across all critical parameters: 100 mA maximum collector current, 50 V collector-emitter breakdown voltage, 22 kOhm base and emitter-base resistors, and 250 mW power dissipation. Both are RoHS3 compliant with MSL 1 rating. The primary difference is packaging: PDTC124ET,235 uses SOT-23 while DTC124EKA-TP uses SOT-23-3. These packages share compatible footprints for surface mount applications.

Q: What is the difference between SOT-23-3 and SC-59 packages?

A: SOT-23-3 and SC-59 are both three-lead surface mount packages for transistors, but they have different physical dimensions and land patterns. SOT-23-3 is a smaller package, while SC-59 is larger. Parts in SC-59 package (MUN2212T1G, NSVMUN2212T1G, SMUN2212T1G) are electrically equivalent but require different PCB footprints. Verify your board design supports the selected package before substitution.

Q: Why do some substitute parts have higher power ratings than the original?

A: Power rating differences reflect manufacturing variations and thermal design characteristics across different manufacturers. The onsemi MUN2212T1G (338 mW) and NSVMMUN2212LT1G (246 mW) exceed the original 200 mW specification, providing additional thermal margin. This does not affect compatibility; the parts operate within the same electrical parameters and can handle the same current and voltage conditions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL 1 moisture sensitivity rating, matching the original DTC124EKA-TP specifications. This ensures compatibility with modern manufacturing processes and environmental regulations.

Q: What is the significance of the hFE (DC Current Gain) difference between DTC124EKA-TP and substitute parts?

A: The DTC124EKA-TP specifies hFE minimum of 56 @ 5mA, 5V, while most substitute parts specify 60 @ 5mA, 10V. This represents a minor specification variation across manufacturers. Both values fall within acceptable ranges for pre-biased transistor applications. The higher hFE in substitutes provides slightly improved current gain characteristics without affecting circuit compatibility.

Q: Can I substitute parts with different Vce saturation specifications?

A: Yes, with consideration of application requirements. The DTC124EKA-TP specifies 300 mV saturation voltage, while PDTC124ET series parts specify 150 mV. Lower saturation voltage (150 mV) indicates improved switching performance and reduced power dissipation during saturation. This is a beneficial characteristic for most applications. Verify your circuit design does not depend on the higher saturation voltage of the original part.

Q: Which substitute offers the best inventory availability?

A: The NSVMMUN2212LT1G from onsemi offers the highest inventory with 95,300 units in stock. The PDTC124ET,235 from NXP USA Inc. provides 60,735 units. Both are active products suitable for high-volume production requirements.

Q: Is the Rohm DTC124ECAT116 a suitable alternative?

A: Yes. The DTC124ECAT116 provides complete electrical equivalence with identical specifications across all parameters. It is packaged in SST3 format with 1,964 units available in active status. This part is suitable if SST3 package compatibility exists in your design.

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