PDTC123EE,115 Equivalent & Substitute Parts

Part Overview

The PDTC123EE,115 is a pre-biased NPN bipolar junction transistor (BJT) manufactured by NXP USA Inc. in SC-75 (SOT-416) surface mount packaging. This device integrates internal base and emitter resistors (2.2 kOhms each) for simplified circuit design in switching and amplification applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical 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)	2.2	kOhms
Resistor - Emitter Base (R2)	2.2	kOhms
DC Current Gain (hFE) Min @ Ic, Vce	30 @ 20mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	150mV @ 500µA, 10mA	—
Current - Collector Cutoff (Max)	1	µA
Power - Max	150	mW
Mounting Type	Surface Mount	—
Package / Case	SC-75, SOT-416	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the PDTC123EE,115 is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor type: NPN - Pre-Biased
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 50 V
Base resistor (R1): 2.2 kOhms
Emitter-base resistor (R2): 2.2 kOhms
RoHS3 compliance and MSL 1 rating

Substitution Categories:

Category 1: Same Package (SC-75/SOT-416) - Direct Pin-Compatible Substitutes Parts maintaining identical SC-75 packaging with matching internal resistor values (R1 = 2.2 kOhms, R2 = 2.2 kOhms) and 100 mA collector current rating.

Category 2: Alternative Packages (SOT-23-3, SOT-323, SOT-523, EMT3) - Functional Equivalents Parts with identical electrical specifications but different surface mount packages. These require PCB layout modification but maintain full electrical compatibility.

Category 3: Modified Internal Resistor Values - Application-Specific Alternatives Parts with different base or emitter resistor values that alter switching characteristics. These are suitable only for applications where the modified bias network is acceptable.

Category 4: Reduced Current Rating - Lower Performance Alternatives Parts with collector current ratings below 100 mA (50 mA, 30 mA, 20 mA). These are suitable only for applications with reduced current requirements.

All substitute parts listed maintain 50 V breakdown voltage, RoHS3 compliance, and MSL 1 rating.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	R1 (kOhms)	R2 (kOhms)	Package	Status
PDTC123EE,115	NXP USA Inc.	100	50	2.2	2.2	SC-75	Obsolete
DDTC123TCA-7-F	Diodes Incorporated	100	50	2.2	—	SOT-23-3	Active
DDTC123TE-7-F	Diodes Incorporated	100	50	2.2	—	SOT-523	Active
DDTC123TUA-7-F	Diodes Incorporated	100	50	2.2	—	SOT-323	Active
DTC023EEBTL	Rohm Semiconductor	100	50	2.2	2.2	EMT3F	Active
DTC114EETL	Rohm Semiconductor	50	50	10	10	SC-75	Active
DTC115EETL	Rohm Semiconductor	20	50	100	100	SC-75	Active
DTC123EET1G	onsemi	100	50	2.2	2.2	SC-75	Active
DTC123EETL	Rohm Semiconductor	100	50	2.2	2.2	SC-75	Active
DTC123JET1G	onsemi	100	50	2.2	47	SC-75	Active
DTC124EETL	Rohm Semiconductor	30	50	22	22	SC-75	Active

Engineering Selection Recommendations

Direct Replacement (No PCB Modification Required):

For applications requiring identical SC-75 packaging and matching internal resistor configuration (R1 = 2.2 kOhms, R2 = 2.2 kOhms), the following active parts provide direct substitution:

DTC123EET1G (onsemi): Active status, SC-75 package, 100 mA collector current, matching 2.2 kOhms base and emitter resistors. RoHS3 compliant, MSL 1.
DTC123EETL (Rohm Semiconductor): Active status, SC-75 package, 100 mA collector current, matching 2.2 kOhms base and emitter resistors. RoHS3 compliant, MSL 1.

Alternative Package Substitutes (PCB Layout Modification Required):

For applications where package change is acceptable:

DDTC123TUA-7-F (Diodes Incorporated): SOT-323 package, 100 mA collector current, 2.2 kOhms base resistor. Active status, RoHS3 compliant, MSL 1. Highest inventory availability (129,180 pcs).
DDTC123TCA-7-F (Diodes Incorporated): SOT-23-3 package, 100 mA collector current, 2.2 kOhms base resistor. Active status, RoHS3 compliant, MSL 1.
DDTC123TE-7-F (Diodes Incorporated): SOT-523 package, 100 mA collector current, 2.2 kOhms base resistor. Active status, RoHS3 compliant, MSL 1.

Modified Bias Network Substitutes (Application-Dependent):

DTC023EEBTL (Rohm Semiconductor): EMT3F package, 100 mA collector current, matching 2.2 kOhms resistor pair. Active status, RoHS3 compliant, MSL 1.
DTC123JET1G (onsemi): SC-75 package, 100 mA collector current, 2.2 kOhms base resistor but 47 kOhms emitter resistor. Alters bias characteristics. Active status, RoHS3 compliant, MSL 1.

Reduced Current Alternatives (Lower Performance Applications):

DTC124EETL (Rohm Semiconductor): SC-75 package, 30 mA collector current, 22 kOhms resistor pair. Suitable for applications with reduced current requirements.
DTC114EETL (Rohm Semiconductor): SC-75 package, 50 mA collector current, 10 kOhms resistor pair. Suitable for applications with reduced current requirements.
DTC115EETL (Rohm Semiconductor): SC-75 package, 20 mA collector current, 100 kOhms resistor pair. Suitable for applications with reduced current requirements.

All recommended substitutes maintain 50 V collector-emitter breakdown voltage, RoHS3 compliance, and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q1: Can DDTC123TUA-7-F replace PDTC123EE,115 without circuit modification?

A: DDTC123TUA-7-F provides electrical equivalence (100 mA, 50 V, 2.2 kOhms base resistor) but uses SOT-323 packaging instead of SC-75. PCB footprint modification is required. No circuit schematic changes are necessary if the package change is accommodated in layout.

Q2: What is the difference between DTC123EET1G and DTC123EETL?

A: Both parts provide identical electrical specifications (100 mA, 50 V, 2.2 kOhms base and emitter resistors, SC-75 package). DTC123EET1G is manufactured by onsemi; DTC123EETL is manufactured by Rohm Semiconductor. Selection depends on supplier availability and procurement requirements.

Q3: Why does DTC123JET1G have a different emitter resistor value (47 kOhms vs. 2.2 kOhms)?

A: DTC123JET1G incorporates a 47 kOhms emitter resistor instead of 2.2 kOhms, which modifies the internal bias network and switching characteristics. This part is suitable only for applications where the altered bias configuration is acceptable. Direct substitution in existing circuits may alter performance.

Q4: Can DTC124EETL be used in place of PDTC123EE,115?

A: DTC124EETL has a reduced collector current rating (30 mA vs. 100 mA) and different internal resistor values (22 kOhms vs. 2.2 kOhms). This part is suitable only for applications with lower current requirements and where the modified bias network is acceptable.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this document are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the PDTC123EE,115.

Q6: Which substitute offers the highest inventory availability?

A: DDTC123TUA-7-F (Diodes Incorporated, SOT-323 package) has the highest inventory availability at 129,180 pieces in stock.

Q7: What is the primary reason for substituting PDTC123EE,115?

A: The PDTC123EE,115 is classified as obsolete. Active equivalent parts must be identified to ensure long-term supply chain continuity and support for new production or design revisions.

Q8: Do Diodes Incorporated DDTC123 variants specify emitter resistor values?

A: The provided specifications for DDTC123TCA-7-F, DDTC123TE-7-F, and DDTC123TUA-7-F do not include emitter resistor (R2) values in the input data. These parts are specified with 2.2 kOhms base resistor (R1) only. Verification with manufacturer datasheets is necessary for complete internal resistor configuration.

Q9: Can alternative package substitutes be used in existing PCB designs without modification?

A: No. Alternative package substitutes (SOT-23-3, SOT-323, SOT-523, EMT3) require PCB footprint redesign. Direct soldering into existing SC-75 footprints is not possible.

Q10: What compliance certifications apply to all substitute parts?

A: All substitute parts are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99. MSL rating is 1 (Unlimited) for all parts listed.

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