PDTC124EE,115 Equivalent & Substitute Parts

Part Overview

The PDTC124EE,115 is a pre-biased NPN bipolar junction transistor (BJT) manufactured by NXP USA Inc., designed for surface mount applications in the SC-75 (SOT-416) package. This device integrates internal base and emitter resistors, enabling simplified circuit design for switching and amplification applications. The part is rated for 50 V collector-emitter breakdown voltage and 100 mA maximum collector current with 150 mW power dissipation.

The PDTC124EE,115 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

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)	22	kOhms
Emitter-Base Resistor (R2)	22	kOhms
DC Current Gain (hFE) Minimum	60	@ 5mA, 5V
Vce Saturation Maximum	150	mV @ 500µA, 10mA
Collector Cutoff Current (Icbo)	1	µA
Power Dissipation Maximum	150	mW
Package Type	SC-75, SOT-416	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the PDTC124EE,115 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Collector-emitter breakdown voltage: 50 V minimum
Maximum collector current: 100 mA minimum
Base resistor (R1): 22 kOhms (internal biasing network)
Emitter-base resistor (R2): 22 kOhms (internal biasing network)
DC current gain (hFE): minimum 60 at specified test conditions
Vce saturation: acceptable range up to 300 mV
Power dissipation: 150 mW minimum

Package and Mounting Compatibility:

Surface mount technology required
SC-75 (SOT-416) package preferred for direct replacement
Alternative packages (SOT-23-3, SOT-323, SOT-523) acceptable with PCB layout modification

Compliance and Regulatory:

RoHS3 compliance required
Moisture sensitivity level 1 (unlimited shelf life)
REACH unaffected status

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalents (SC-75/SOT-416) Parts maintaining identical package footprint: DTC124EET1G, DTC124EE-TP, DTC123EETL

Category 2: Alternative Package Substitutes (SOT-23-3, SOT-323, SOT-523) Parts with enhanced electrical performance but requiring PCB layout modification: DDTC124GCA-7-F, DDTC124GUA-7-F, DDTC124TCA-7-F, DDTC124TE-7-F, DDTC124TUA-7-F

Category 3: Current-Limited Alternatives Parts with reduced collector current rating but compatible voltage and biasing: DTC114EETL (50 mA), DTC115EETL (20 mA)

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vceo (Max) V	R1 (kOhms)	R2 (kOhms)	hFE Min	Vce Sat (Max) mV	Power (Max) mW	Package	Status
PDTC124EE,115	NXP USA Inc.	100	50	22	22	60	150	150	SC-75	Obsolete
DTC124EET1G	onsemi	100	50	22	22	60	250	200	SC-75	Active
DTC124EE-TP	Micro Commercial Co	100	50	22	22	56	300	150	SOT-523	Active
DDTC124GCA-7-F	Diodes Incorporated	100	50	—	22	56	300	200	SOT-23-3	Active
DDTC124GUA-7-F	Diodes Incorporated	100	50	—	22	56	300	200	SOT-323	Active
DDTC124TCA-7-F	Diodes Incorporated	100	50	22	—	100	300	200	SOT-23-3	Active
DDTC124TE-7-F	Diodes Incorporated	100	50	22	—	100	300	150	SOT-523	Active
DDTC124TUA-7-F	Diodes Incorporated	100	50	22	—	100	300	200	SOT-323	Active
DTC114EETL	Rohm Semiconductor	50	50	10	10	30	300	150	SC-75	Active
DTC115EETL	Rohm Semiconductor	20	50	100	100	82	300	150	SC-75	Active
DTC123EETL	Rohm Semiconductor	100	50	2.2	2.2	20	300	150	SC-75	Active

Engineering Selection Recommendations

Primary Recommendation: DTC124EET1G (onsemi)

The DTC124EET1G is the optimal direct substitute for the obsolete PDTC124EE,115. This part maintains identical electrical specifications including 100 mA collector current, 50 V breakdown voltage, and 22 kOhm internal resistor network. The SC-75 package footprint is identical, enabling direct PCB replacement without layout modification. The part is active in production with extensive inventory availability (50,100 units in stock). RoHS3 compliance and MSL 1 rating match the original specification. The increased power rating (200 mW versus 150 mW) and improved Vce saturation characteristics (250 mV) provide enhanced performance margin.

Secondary Recommendation: DTC124EE-TP (Micro Commercial Co)

The DTC124EE-TP provides electrical equivalence with identical biasing resistor values (22 kOhms). This part is active and maintains the 100 mA collector current and 50 V breakdown voltage. The SOT-523 package requires PCB layout modification but offers a smaller footprint. Power dissipation matches the original 150 mW specification. This option is suitable when space constraints justify layout redesign.

Alternative Recommendations for Specific Applications:

For applications requiring enhanced switching speed or higher power dissipation, the DDTC124 series from Diodes Incorporated (DDTC124GCA-7-F, DDTC124TCA-7-F, DDTC124TE-7-F, DDTC124TUA-7-F) offers 250 MHz transition frequency and 200 mW power rating. These parts require package-specific PCB modifications (SOT-23-3, SOT-323, or SOT-523).

For current-limited applications, DTC114EETL (50 mA maximum) and DTC115EETL (20 mA maximum) provide SC-75 package compatibility with reduced collector current ratings and modified internal biasing networks.

Compliance Verification:

All recommended substitutes maintain RoHS3 compliance, MSL 1 moisture sensitivity rating, and REACH unaffected status. All parts are classified as active products with confirmed production status and inventory availability.

Frequently Asked Questions (FAQ)

Q1: Can DTC124EET1G directly replace PDTC124EE,115 without PCB modification?

Yes. The DTC124EET1G maintains identical SC-75 package footprint, pin configuration, and electrical specifications. Direct PCB replacement is possible without layout modification. Both parts feature 100 mA collector current, 50 V breakdown voltage, and 22 kOhm internal resistor networks.

Q2: What is the difference between SC-75 and SOT-523 packages?

SC-75 (SOT-416) is a 3-pin surface mount package with 1.27 mm pitch. SOT-523 is a smaller 5-pin package with 0.65 mm pitch. SOT-523 packages require PCB layout redesign including modified trace routing and pad dimensions. Electrical function remains identical; only physical footprint differs.

Q3: Why do some substitute parts have different internal resistor values?

Internal resistor values determine the biasing characteristics and switching behavior of pre-biased transistors. Parts with 22 kOhm resistors (PDTC124EE,115, DTC124EET1G, DTC124EE-TP) are direct electrical equivalents. Parts with different resistor values (DTC123EETL with 2.2 kOhm, DTC115EETL with 100 kOhm) are application-specific variants with different gain and switching characteristics. Selection depends on circuit requirements.

Q4: Is the increased power rating (200 mW) of DTC124EET1G a concern?

No. The increased power rating of 200 mW in DTC124EET1G compared to the original 150 mW specification provides additional thermal margin and reliability. This is a performance enhancement, not a limitation. The part operates within the same voltage and current specifications.

Q5: Can DTC114EETL or DTC115EETL be used as substitutes?

DTC114EETL and DTC115EETL are not direct substitutes. These parts have reduced collector current ratings (50 mA and 20 mA respectively) and different internal resistor networks. They are suitable only for applications where the lower current rating is acceptable. Verify circuit requirements before selection.

Q6: What is the significance of the "Active" product status?

Active status indicates the part is in current production with confirmed long-term availability. Obsolete parts like PDTC124EE,115 are no longer manufactured and inventory is limited. Active substitutes ensure supply chain continuity and support for future production runs.

Q7: Are all substitute parts RoHS3 compliant?

Yes. All recommended substitute parts listed maintain RoHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original PDTC124EE,115.

Q8: Which substitute offers the best performance for high-speed switching applications?

The DDTC124 series from Diodes Incorporated (DDTC124GCA-7-F, DDTC124TCA-7-F, DDTC124TE-7-F, DDTC124TUA-7-F) features 250 MHz transition frequency, compared to the original part's unspecified frequency response. These parts are optimized for high-speed switching but require package-specific PCB modifications.

Q9: What inventory levels are available for each substitute?

DTC124EET1G: 50,100 units. DTC124EE-TP: 1,037 units. DDTC124GCA-7-F: 718 units. DDTC124GUA-7-F: 699 units. DDTC124TCA-7-F: 32,529 units. DDTC124TE-7-F: 32,400 units. DDTC124TUA-7-F: 9,300 units. DTC114EETL: 506,300 units. DTC115EETL: 85,100 units. DTC123EETL: 20,300 units. Verify current availability with suppliers before design finalization.

Q10: Is moisture sensitivity a concern for these parts?

No. All substitute parts maintain MSL 1 (Unlimited) rating, identical to the original PDTC124EE,115. This classification indicates unlimited shelf life without special moisture control requirements during storage or handling.

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