DDTC115TKA-7-F Equivalent & Substitute Parts

Part Overview

The DDTC115TKA-7-F is a pre-biased NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SC-59-3 package. This device 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 functionally equivalent alternatives for ongoing production and design requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and frequency response while accommodating different base resistor configurations and packaging variants.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Pre-Biased	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	100	mA
Resistor - Base (R1)	100	kOhms
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1mA, 5V	—
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	—

Substitute Part Grouping Explanation

Substitution of the DDTC115TKA-7-F is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Voltage - Collector Emitter Breakdown: 50 V (minimum requirement)
Current - Collector (Ic) (Max): 100 mA (minimum requirement)
Transistor Type: NPN - Pre-Biased
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount variants)
Mounting Type: Surface Mount
Frequency - Transition: 250 MHz or higher
Power - Max: 200 mW or higher

Secondary Consideration:

Resistor - Base (R1): The DDTC115TKA-7-F specifies 100 kOhms. Substitute parts with different base resistor values (10 kOhms, 22 kOhms, 47 kOhms, 4.7 kOhms, 2.2 kOhms) are functionally equivalent when circuit design accommodates the altered bias network characteristics.

All substitute parts listed maintain the core electrical specifications and surface mount packaging compatibility. Product status and availability are secondary factors that support selection decisions.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	R1 (Base) kOhms	hFE (Min) @ Ic, Vce	Frequency MHz	Power (Max) mW	Package	Product Status
DDTC115TKA-7-F	Diodes Incorporated	100	50	100	100 @ 1mA, 5V	250	200	SC-59-3	Obsolete
DTC124TKAT146	Rohm Semiconductor	100	50	22	100 @ 1mA, 5V	250	200	SMT3	Not For New Designs
MUN2236T1G	onsemi	100	50	100	80 @ 5mA, 10V	—	338	SC-59	Last Time Buy
PDTC115TT,215	Nexperia USA Inc.	100	50	100	100 @ 1mA, 5V	250	250	TO-236AB	Active
DTC114TCA-TP	Micro Commercial Co	100	50	10	100 @ 1mA, 5V	250	200	SOT-23	Active
DTC114TKAT146	Rohm Semiconductor	100	50	10	100 @ 1mA, 5V	250	200	SMT3	Active
DTC143TKAT146	Rohm Semiconductor	100	50	4.7	100 @ 1mA, 5V	250	200	SMT3	Active
DTC144TCA-TP	Micro Commercial Co	100	50	47	100 @ 1mA, 5V	250	200	SOT-23	Active
DTD114GKT146	Rohm Semiconductor	500	50	—	56 @ 50mA, 5V	200	200	SMT3	Active
MMUN2215LT1G	onsemi	100	50	10	160 @ 5mA, 10V	—	400	SOT-23-3	Active
MMUN2238LT1G	onsemi	100	50	2.2	160 @ 5mA, 10V	—	246	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation: PDTC115TT,215

The PDTC115TT,215 manufactured by Nexperia USA Inc. is the optimal substitute for the obsolete DDTC115TKA-7-F. This part maintains identical base resistor value (100 kOhms), matching DC current gain specification (100 @ 1mA, 5V), and equivalent electrical performance across all critical parameters. The device carries Active product status, ensuring long-term availability and supply chain stability. PDTC115TT,215 is ROHS3 compliant and REACH unaffected, meeting all regulatory requirements of the original part. The TO-236AB package is functionally equivalent to SC-59-3 for surface mount applications.

Secondary Recommendations: DTC114TKAT146 and DTC143TKAT146

Both Rohm Semiconductor parts (DTC114TKAT146 and DTC143TKAT146) provide Active product status with high inventory availability (186,620 and 365,200 units respectively). These devices maintain the 50 V voltage rating, 100 mA collector current, and 250 MHz transition frequency. The primary difference is base resistor configuration: DTC114TKAT146 features 10 kOhms while DTC143TKAT146 features 4.7 kOhms. Circuit design modifications to accommodate altered bias networks are required for these substitutions.

Alternative Options: MMUN2215LT1G and MMUN2238LT1G

onsemi parts MMUN2215LT1G and MMUN2238LT1G offer enhanced power dissipation capability (400 mW and 246 mW respectively) and higher DC current gain (160 @ 5mA, 10V). These devices are suitable for applications requiring improved thermal performance. Base resistor values differ significantly (10 kOhms and 2.2 kOhms respectively), necessitating circuit evaluation.

Not Recommended for New Designs:

DTC124TKAT146 (Rohm Semiconductor) carries "Not For New Designs" status despite electrical compatibility. This designation indicates manufacturer discontinuation trajectory and should be avoided for new product development.

Frequently Asked Questions (FAQ)

Q: Can PDTC115TT,215 directly replace DDTC115TKA-7-F without circuit modification?

A: Yes. PDTC115TT,215 maintains identical base resistor value (100 kOhms), DC current gain (100 @ 1mA, 5V), and all critical electrical parameters. The TO-236AB package is functionally equivalent to SC-59-3 for surface mount assembly. No circuit redesign is required.

Q: What is the significance of different base resistor values in substitute parts?

A: The base resistor (R1) determines the bias network characteristics and switching behavior of the pre-biased transistor. Parts with different R1 values (10 kOhms, 22 kOhms, 47 kOhms, 4.7 kOhms, 2.2 kOhms) alter the turn-on threshold and saturation characteristics. Circuit design must accommodate these differences through analysis of bias point requirements and switching speed specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original DDTC115TKA-7-F.

Q: What is the difference between SC-59-3, SMT3, and SOT-23-3 packages?

A: SC-59-3, SMT3, and SOT-23-3 are equivalent designations for the same three-lead surface mount package (TO-236-3). Nomenclature varies by manufacturer but all are physically and electrically compatible for PCB assembly.

Q: Why is DTD114GKT146 listed if it has 500 mA collector current?

A: DTD114GKT146 exceeds the 100 mA specification of the original part. This device is included as a higher-current alternative for applications requiring increased collector current capacity while maintaining the 50 V voltage rating and surface mount packaging. Use is restricted to circuits where the higher current rating does not introduce thermal or reliability concerns.

Q: Can MMUN2215LT1G or MMUN2238LT1G be used in existing designs without testing?

A: These onsemi parts offer higher power dissipation (400 mW and 246 mW versus 200 mW) and different DC current gain characteristics (160 @ 5mA, 10V versus 100 @ 1mA, 5V). While electrically compatible at the 50 V, 100 mA level, circuit performance may differ due to altered gain and saturation characteristics. Application-specific evaluation is necessary.

Q: What is the inventory status of recommended substitutes?

A: PDTC115TT,215 has 6,839 units in stock. DTC114TKAT146 has 186,620 units. DTC143TKAT146 has 365,200 units. MMUN2238LT1G has 195,800 units. All recommended parts maintain sufficient inventory for production requirements.

Q: Are there any ECCN or HTSUS code differences between the original and substitute parts?

A: The original DDTC115TKA-7-F carries ECCN EAR99 and HTSUS 8541.21.0075. Most substitute parts maintain identical ECCN classification (EAR99). HTSUS codes vary slightly (8541.21.0095 for some parts) but remain within the same commodity classification for semiconductor transistors. Customs and export compliance review is recommended for specific jurisdictions.

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