DTC143ECA-TP Equivalent & Substitute Parts

Part Overview

The DTC143ECA-TP is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-23 package. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and transition frequency of 250 MHz. The device is classified as Active product status and carries ROHS3 compliance with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and functional performance within the pre-biased NPN transistor category. Substitution becomes necessary when the primary part reaches end-of-life status, experiences supply constraints, or when alternative packaging formats are required for manufacturing optimization.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - 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
Collector Cutoff Current (Icbo)	500	nA
Transition Frequency (fT)	250	MHz
Power Dissipation Maximum	200	mW
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DTC143ECA-TP is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Transistor type: NPN pre-biased configuration
Collector current rating: 100 mA maximum
Collector-emitter breakdown voltage: 50 V
Base and emitter-base resistor values: 4.7 kOhms each
DC current gain (hFE): 30 minimum at specified bias conditions
Vce saturation: 300 mV maximum at specified conditions
Transition frequency: 250 MHz
Power dissipation: 200 mW maximum
Surface mount package compatibility: TO-236-3 / SOT-23-3 footprint

Secondary Compatibility Factors:

RoHS3 compliance status
Moisture sensitivity level (MSL 1)
Product status (Active preferred; Last Time Buy acceptable with supply verification)

Parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Similar Alternatives (matching core parameters with variations in specific resistor values, current gain, or transition frequency that remain within functional tolerance for the DTC143 application class).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vceo (Max) V	R1 (kOhms)	R2 (kOhms)	hFE Min	fT (MHz)	Package	Product Status
DTC143ECA-TP	Micro Commercial Co	100	50	4.7	4.7	30 @ 10mA, 5V	250	SOT-23	Active
RN1401,LF	Toshiba Semiconductor and Storage	100	50	4.7	4.7	30 @ 10mA, 5V	250	S-Mini	Active
BCR116E6327HTSA1	Infineon Technologies	100	50	4.7	47	70 @ 5mA, 5V	150	PG-SOT23	Last Time Buy
DDTC143ECA-7-F	Diodes Incorporated	100	50	4.7	4.7	20 @ 10mA, 5V	250	SOT-23-3	Active
DTC114EKAT146	Rohm Semiconductor	50	50	10	10	30 @ 5mA, 5V	250	SMT3	Active
DTC115EKAT146	Rohm Semiconductor	20	50	100	100	82 @ 5mA, 5V	250	SMT3	Active
DTC123EKAT146	Rohm Semiconductor	100	50	2.2	2.2	20 @ 20mA, 5V	250	SMT3	Active
DTC124EKAT146	Rohm Semiconductor	30	50	22	22	56 @ 5mA, 5V	250	SMT3	Active
DTC143ECAT116	Rohm Semiconductor	100	50	4.7	4.7	30 @ 10mA, 5V	250	SST3	Active
DTC143EKAT146	Rohm Semiconductor	100	50	4.7	4.7	30 @ 10mA, 5V	250	SMT3	Active
DTC144EKAT146	Rohm Semiconductor	100	50	47	47	68 @ 5mA, 5V	250	SMT3	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The following parts provide electrical and mechanical equivalence to the DTC143ECA-TP with identical or functionally equivalent specifications:

RN1401,LF (Toshiba): Matches all critical electrical parameters including 100 mA collector current, 4.7 kOhm resistor configuration, and 250 MHz transition frequency. Active product status with unlimited MSL. Package format is S-Mini, compatible with SOT-23-3 footprint. Suitable for direct substitution in production environments.
DDTC143ECA-7-F (Diodes Incorporated): Provides identical electrical performance with 100 mA collector current and 4.7 kOhm resistor values. DC current gain minimum of 20 at specified conditions remains within functional tolerance for DTC143 application class. Active product status. SOT-23-3 package format ensures mechanical compatibility.
DTC143EKAT146 (Rohm Semiconductor): Exact electrical equivalent with 100 mA collector current, 4.7 kOhm resistor configuration, and 250 MHz transition frequency. Active product status. SMT3 package format maintains TO-236-3 footprint compatibility. High inventory availability (704,400 units) supports supply continuity.
DTC143ECAT116 (Rohm Semiconductor): Identical electrical specifications to the primary part. Active product status. SST3 package format provides alternative surface mount configuration while maintaining functional equivalence.

Similar Alternatives (Application-Dependent Selection):

The following parts share the 50 V collector-emitter breakdown voltage and surface mount package compatibility but feature different collector current ratings and resistor configurations. Selection depends on specific circuit requirements:

DTC123EKAT146 (Rohm Semiconductor): 100 mA collector current with 2.2 kOhm resistor configuration. Suitable for applications requiring lower base impedance and faster switching response compared to the 4.7 kOhm configuration.
DTC124EKAT146 (Rohm Semiconductor): 30 mA collector current with 22 kOhm resistor configuration. Applicable for lower-current applications with higher base impedance requirements.
DTC114EKAT146 (Rohm Semiconductor): 50 mA collector current with 10 kOhm resistor configuration. Suitable for medium-current applications.
DTC115EKAT146 (Rohm Semiconductor): 20 mA collector current with 100 kOhm resistor configuration. Applicable for low-current, high-impedance applications.
DTC144EKAT146 (Rohm Semiconductor): 100 mA collector current with 47 kOhm resistor configuration. Suitable for applications requiring higher base impedance with full collector current capability.

Last Time Buy Consideration:

BCR116E6327HTSA1 (Infineon Technologies): Designated Last Time Buy status. Electrical parameters include 100 mA collector current and 50 V breakdown voltage. Transition frequency of 150 MHz is lower than the primary part. Emitter-base resistor value of 47 kOhms differs from the 4.7 kOhm configuration. This part is acceptable only when supply of Active-status alternatives is unavailable and circuit design accommodates the specified parameter variations.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and surface mount compatibility with the original DTC143ECA-TP application footprint.

Frequently Asked Questions (FAQ)

Q: Can RN1401,LF be used as a direct replacement for DTC143ECA-TP?

A: Yes. RN1401,LF provides identical electrical specifications including 100 mA collector current, 4.7 kOhm resistor configuration, 30 minimum DC current gain, and 250 MHz transition frequency. The S-Mini package format is mechanically compatible with SOT-23-3 footprint requirements. Both parts carry Active product status and ROHS3 compliance.

Q: What is the difference between DTC143EKAT146 and DTC143ECAT116?

A: Both parts are manufactured by Rohm Semiconductor and provide identical electrical specifications to the DTC143ECA-TP. The primary difference is the package format: DTC143EKAT146 uses SMT3 packaging, while DTC143ECAT116 uses SST3 packaging. Both maintain TO-236-3 footprint compatibility. Selection depends on specific assembly equipment and board layout requirements.

Q: Why is BCR116E6327HTSA1 marked as Last Time Buy?

A: BCR116E6327HTSA1 carries Last Time Buy designation, indicating the manufacturer has announced end-of-production. While the part meets the 100 mA collector current and 50 V breakdown voltage requirements, the transition frequency of 150 MHz is lower than the 250 MHz specification of the primary part, and the 47 kOhm emitter-base resistor differs from the 4.7 kOhm configuration. This part should be selected only when Active-status alternatives are unavailable and circuit design accommodates these parameter variations.

Q: Can DTC123EKAT146 replace DTC143ECA-TP in all applications?

A: DTC123EKAT146 provides the same 100 mA collector current and 50 V breakdown voltage as the primary part. However, the base and emitter-base resistor values are 2.2 kOhms instead of 4.7 kOhms. This lower impedance configuration results in faster switching response and different bias characteristics. Substitution is valid only when circuit design accommodates the altered resistor configuration and switching performance.

Q: What are the collector current limitations of alternative parts?

A: The DTC143ECA-TP is rated for 100 mA maximum collector current. Direct equivalents (RN1401,LF, DDTC143ECA-7-F, DTC143EKAT146, DTC143ECAT116, DTC123EKAT146) maintain this 100 mA rating. Alternative parts with reduced current ratings include DTC124EKAT146 (30 mA), DTC114EKAT146 (50 mA), and DTC115EKAT146 (20 mA). Selection of lower-current alternatives is appropriate only when circuit design does not require the full 100 mA capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference carry ROHS3 compliance status and MSL 1 (Unlimited) moisture sensitivity level, matching the environmental and regulatory requirements of the primary DTC143ECA-TP part.

Q: What is the significance of the DC current gain (hFE) variations among substitute parts?

A: DC current gain variations reflect different internal resistor network configurations within the pre-biased transistor structure. The primary part specifies hFE minimum of 30 at 10 mA collector current and 5 V Vce. Substitute parts with different hFE values (such as BCR116E6327HTSA1 at 70, DTC144EKAT146 at 68, or DTC115EKAT146 at 82) indicate different bias characteristics. Substitution is valid when circuit design accommodates the specified gain variation or when the application is gain-insensitive.

Q: Can parts with different package formats (SOT-23 vs. SMT3 vs. S-Mini) be used interchangeably?

A: All substitute parts maintain mechanical compatibility with the TO-236-3 / SOT-23-3 footprint standard. Package format variations (SOT-23, SMT3, S-Mini, SST3, PG-SOT23) represent different supplier designations for the same physical footprint. Interchangeability depends on assembly equipment capability and board layout design. Verification with manufacturing engineering is recommended when changing package format suppliers.

Q: What inventory considerations apply to substitute part selection?

A: Inventory availability varies significantly among substitute parts. DTC143EKAT146 (Rohm) offers 704,400 units in stock, providing strong supply continuity. DTC124EKAT146 (Rohm) provides 1,265,200 units. RN1401,LF (Toshiba) offers 36,300 units. DTC143ECAT116 (Rohm) has limited availability at 1,098 units. Primary part DTC143ECA-TP maintains 3,200 units. Inventory levels should be evaluated in conjunction with production volume requirements and supply chain strategy.

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