DDTC124EE-7-F Equivalent & Substitute Parts

Part Overview

The DDTC124EE-7-F is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Diodes Incorporated. This surface mount device operates at 50 V maximum collector-emitter breakdown voltage with a maximum collector current of 100 mA and 250 MHz transition frequency. The part is housed in a SOT-523 package and is designed for applications requiring integrated base bias resistors (22 kOhms each). The DDTC124EE-7-F maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching or compatible electrical characteristics including collector current rating, breakdown voltage, base resistor values, and saturation voltage specifications. Substitutes may differ in package type, transition frequency, or power dissipation ratings while maintaining functional equivalence 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	150	mW
Package / Case	SOT-523	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DDTC124EE-7-F is determined by the following critical electrical parameters:

Primary Matching Criteria:

Collector current rating (Ic Max): 100 mA
Collector-emitter breakdown voltage (Vce): 50 V
Base resistor configuration (R1 and R2): 22 kOhms each
DC current gain (hFE): 56 @ 5mA, 5V
Saturation voltage (Vce Sat): 300mV @ 500µA, 10mA

Secondary Compatibility Factors:

Transition frequency: 250 MHz or higher
Power dissipation: 150 mW or greater
Package type: SOT-523, SC-75, SOT-416, or EMT3 (all surface mount)
Mounting configuration: Surface mount (Tape & Reel or Cut Tape)

Substitutes are grouped into two categories: Direct Equivalents (identical electrical specifications with different packaging) and Functional Equivalents (matching core parameters with acceptable variations in secondary characteristics). Parts with different base resistor values, collector current ratings, or breakdown voltages are listed as functional equivalents only when the application permits operation within their specified ranges.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce (Max) V	R1 / R2 kOhms	hFE @ Ic, Vce	Vce Sat (Max) mV	Freq MHz	Power mW	Package
DDTC124EE-7-F	Diodes Inc.	100	50	22 / 22	56 @ 5mA, 5V	300 @ 500µA, 10mA	250	150	SOT-523
DTC124EET1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250 @ 300µA, 10mA	—	200	SC-75, SOT-416
DTC124EETL	Rohm Semi.	30	50	22 / 22	56 @ 5mA, 5V	300 @ 500µA, 10mA	250	150	SC-75, SOT-416
SDTC124EET1G	onsemi	100	50	22 / 22	60 @ 5mA, 10V	250 @ 300µA, 10mA	—	200	SC-75, SOT-416
DTC123EETL	Rohm Semi.	100	50	2.2 / 2.2	20 @ 20mA, 5V	300 @ 500µA, 10mA	250	150	SC-75, SOT-416
DTC143EETL	Rohm Semi.	100	50	4.7 / 4.7	30 @ 10mA, 5V	300 @ 500µA, 10mA	250	150	SC-75, SOT-416
DTC144EET1G	onsemi	100	50	47 / 47	80 @ 5mA, 10V	250 @ 300µA, 10mA	—	200	SC-75, SOT-416
DTC144EETL	Rohm Semi.	100	50	47 / 47	68 @ 5mA, 5V	300 @ 500µA, 10mA	250	150	SC-75, SOT-416
DTC114EETL	Rohm Semi.	50	50	10 / 10	30 @ 5mA, 5V	300 @ 500µA, 10mA	250	150	SC-75, SOT-416
DTC115EETL	Rohm Semi.	20	50	100 / 100	82 @ 5mA, 5V	300 @ 250µA, 5mA	250	150	SC-75, SOT-416
DTD543EETL	Rohm Semi.	500	12	4.7 / 4.7	115 @ 100mA, 2V	300 @ 2.5mA, 50mA	260	150	SC-75, SOT-416

Engineering Selection Recommendations

Direct Equivalents (100% Functional Replacement):

The DTC124EET1G (onsemi) and SDTC124EET1G (onsemi) are direct functional equivalents to the DDTC124EE-7-F. Both parts maintain identical collector current (100 mA), breakdown voltage (50 V), and base resistor configuration (22 kOhms each). These parts are packaged in SC-75/SOT-416 format instead of SOT-523, requiring PCB layout modification. Both onsemi parts offer higher power dissipation (200 mW vs. 150 mW) and improved saturation voltage performance (250 mV vs. 300 mV). All three parts maintain Active product status, RoHS3 compliance, and unlimited moisture sensitivity rating.

Functional Equivalents (Application-Dependent Substitution):

The DTC124EETL (Rohm Semiconductor) shares identical electrical characteristics with the DDTC124EE-7-F except for maximum collector current, which is rated at 30 mA instead of 100 mA. This part is suitable for applications where collector current does not exceed 30 mA. The DTC144EETL (Rohm Semiconductor) maintains 100 mA collector current and 50 V breakdown voltage but features 47 kOhm base resistors instead of 22 kOhms, resulting in different bias characteristics and higher DC current gain (68 vs. 56). The DTC143EETL (Rohm Semiconductor) provides 100 mA current handling with 4.7 kOhm base resistors and lower DC current gain (30 vs. 56).

Parts with significantly different collector current ratings (DTC114EETL at 50 mA, DTC115EETL at 20 mA) or breakdown voltage (DTD543EETL at 12 V) are not recommended as direct substitutes for the DDTC124EE-7-F unless application requirements explicitly permit operation within their reduced specifications.

All substitute parts listed maintain Active product status, RoHS3 compliance, and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can DTC124EET1G replace DDTC124EE-7-F in all applications?

A: DTC124EET1G is functionally equivalent in electrical performance but requires PCB layout modification due to package change from SOT-523 to SC-75/SOT-416. Pin configuration and footprint differ. Verify PCB compatibility before substitution.

Q: What is the primary difference between DDTC124EE-7-F and DTC124EETL?

A: The maximum collector current differs: DDTC124EE-7-F is rated at 100 mA while DTC124EETL is rated at 30 mA. All other electrical parameters are identical. DTC124EETL is suitable only for applications where collector current remains below 30 mA.

Q: Why do DTC144EETL and DTC143EETL have different base resistor values?

A: Base resistor values (R1 and R2) are integrated into the pre-biased transistor structure and determine the bias point and DC current gain characteristics. DTC144EETL uses 47 kOhm resistors for higher impedance biasing, while DTC143EETL uses 4.7 kOhm resistors for lower impedance biasing. Selection depends on application bias requirements.

Q: Is DTD543EETL a suitable substitute for DDTC124EE-7-F?

A: No. DTD543EETL operates at 12 V maximum breakdown voltage (vs. 50 V) and handles 500 mA collector current (vs. 100 mA). These specifications are fundamentally different and unsuitable for applications designed for the DDTC124EE-7-F.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. All listed substitute parts maintain RoHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and REACH unaffected status, matching the DDTC124EE-7-F regulatory profile.

Q: What is the impact of package change from SOT-523 to SC-75/SOT-416?

A: Package change requires PCB redesign including footprint modification, trace routing adjustment, and potential thermal management changes. Electrical performance remains equivalent, but physical integration differs significantly.

Q: Can SDTC124EET1G be used interchangeably with DTC124EET1G?

A: Yes. Both parts are manufactured by onsemi with identical electrical specifications (100 mA, 50 V, 22 kOhm base resistors). The primary difference is packaging: SDTC124EET1G is supplied in Tape & Reel format while DTC124EET1G is supplied in Cut Tape & Digi-Reel format. Electrical performance and package type are identical.

Q: How do transition frequency differences affect substitution?

A: The DDTC124EE-7-F operates at 250 MHz transition frequency. Substitute parts with equal or higher transition frequency (DTC124EETL, DTC143EETL, DTC144EETL at 250 MHz; DTD543EETL at 260 MHz) are compatible. Parts without specified transition frequency (DTC124EET1G, SDTC124EET1G) are still functionally equivalent for most applications but lack this performance specification.

Q: What does "pre-biased" mean in the context of these transistors?

A: Pre-biased transistors integrate internal base resistors (R1 and R2) directly into the semiconductor structure. These resistors establish a fixed bias point without requiring external biasing components, simplifying circuit design and reducing component count. The DDTC124EE-7-F uses 22 kOhm resistors; different models use different values to achieve different bias characteristics.

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