PDTC123JE,115 Pre-Biased NPN Transistor Equivalent & Substitute Parts

Part Overview

The PDTC123JE,115 is a pre-biased NPN bipolar junction transistor manufactured by NXP USA Inc. in SC-75 (SOT-416) surface mount packaging. This component integrates internal base and emitter resistors, enabling direct logic-level switching applications without external biasing networks. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Pre-Biased	—
Maximum Collector Current (Ic)	100	mA
Collector-Emitter Breakdown Voltage (Max)	50	V
Base Resistor (R1)	2.2	kOhms
Emitter-Base Resistor (R2)	47	kOhms
DC Current Gain (hFE Min)	100	@ 10mA, 5V
Vce Saturation (Max)	100	mV @ 250µA, 5mA
Maximum Power Dissipation	150	mW
Package Type	SC-75, SOT-416	Surface Mount
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the PDTC123JE,115 is determined by strict equivalence in the following electrical parameters:

Critical Matching Parameters:

Transistor type: NPN pre-biased configuration
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 50 V
Base resistor (R1): 2.2 kOhms
Emitter-base resistor (R2): 47 kOhms
DC current gain (hFE): minimum 80 or greater
Vce saturation: maximum 300 mV or lower
RoHS3 compliance and MSL 1 rating

Package Compatibility Tiers:

Tier 1 - Direct Package Match (SC-75/SOT-416): Parts maintaining identical SC-75 or SOT-416 packaging enable direct PCB footprint compatibility without layout modification.

Tier 2 - Alternative Surface Mount Packages (SOT-323, SOT-523, SOT-23-3): Parts in different surface mount packages require PCB redesign but maintain electrical equivalence and surface mount assembly compatibility.

Tier 3 - Specialized Packages (DFN1006-3, EMT3): Parts in specialized packages require significant PCB layout changes but provide electrical equivalence for new designs.

All substitute parts listed maintain active product status, ensuring long-term availability and supply chain reliability compared to the obsolete PDTC123JE,115.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	R1 kOhms	R2 kOhms	hFE Min	Vce Sat (Max) mV	Power (Max) mW	Package	Status
PDTC123JE,115	NXP USA Inc.	100	50	2.2	47	100	100	150	SC-75	Obsolete
DTC123JET1G	onsemi	100	50	2.2	47	80	250	200	SC-75	Active
NSVDTC123JET1G	onsemi	100	50	2.2	47	80	250	200	SC-75	Active
DTC123JETL	Rohm Semiconductor	100	50	2.2	47	80	300	150	SC-75	Active
MUN5235T1G	onsemi	100	50	2.2	47	80	250	202	SC-70	Active
DDTC123JE-7-F	Diodes Incorporated	100	50	2.2	47	80	300	150	SOT-523	Active
DDTC123TE-7-F	Diodes Incorporated	100	50	2.2	—	100	300	150	SOT-523	Active
DDTC123TUA-7-F	Diodes Incorporated	100	50	2.2	—	100	300	200	SOT-323	Active
DDTC123TCA-7-F	Diodes Incorporated	100	50	2.2	—	100	300	200	SOT-23-3	Active
DTC123JE-TP	Micro Commercial Co	100	50	2.2	—	80	250	300	SOT-523	Active
PDTC123JM,315	NXP USA Inc.	100	50	2.2	47	100	100	250	DFN1006-3	Active

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification):

DTC123JET1G (onsemi) and NSVDTC123JET1G (onsemi) are the primary equivalents, both maintaining SC-75 packaging identical to the PDTC123JE,115. Both parts are ROHS3 compliant with MSL 1 rating. DTC123JET1G offers higher inventory availability (260,400 pcs) and active product status. NSVDTC123JET1G provides equivalent electrical performance with lower inventory levels (6,732 pcs).

DTC123JETL (Rohm Semiconductor) in SC-75 packaging provides an alternative with identical mechanical compatibility and active status, though with slightly higher Vce saturation specification (300 mV maximum).

For PCB Redesign Applications:

DDTC123TUA-7-F (Diodes Incorporated) in SOT-323 packaging offers the highest inventory availability (129,180 pcs) among active alternatives, with enhanced power rating (200 mW) and active product status. This part requires PCB layout modification but maintains full electrical equivalence.

PDTC123JM,315 (NXP USA Inc.) in DFN1006-3 packaging provides the same manufacturer as the original part with enhanced power dissipation (250 mW) and active status, suitable for new design implementations.

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard surface mount assembly processes and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can DTC123JET1G directly replace PDTC123JE,115 without PCB changes?

A: Yes. DTC123JET1G maintains identical SC-75 packaging and electrical parameters within specification limits. The part is pin-compatible and footprint-compatible, requiring no PCB modification.

Q: What is the difference between SC-75 and SOT-323 packages?

A: SC-75 (SOT-416) is a 3-pin surface mount package with 1.3 mm pitch. SOT-323 (SC-70) is a smaller 3-pin package with 1.0 mm pitch. Both are surface mount but require different PCB footprints. Substitution between these packages requires PCB redesign.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, matching the original PDTC123JE,115 specifications.

Q: Why does PDTC123JE,115 show as obsolete?

A: The PDTC123JE,115 is classified as obsolete by NXP USA Inc., indicating discontinued production. Active equivalents from onsemi, Diodes Incorporated, Rohm Semiconductor, and Micro Commercial Co provide ongoing supply chain alternatives.

Q: What is the significance of the internal resistor values (R1 = 2.2 kOhms, R2 = 47 kOhms)?

A: These integrated resistors establish the pre-bias network, determining switching threshold and current gain characteristics. Substitutes must maintain identical resistor values to ensure equivalent circuit behavior in logic-level switching applications.

Q: Can I use DDTC123TCA-7-F in SOT-23-3 package as a substitute?

A: DDTC123TCA-7-F is electrically equivalent but requires PCB redesign due to different package geometry (SOT-23-3 versus SC-75). The substitution is valid for new designs but not for direct board-level replacement.

Q: Which substitute offers the best long-term availability?

A: DDTC123TUA-7-F (Diodes Incorporated) in SOT-323 packaging shows the highest current inventory (129,180 pcs) with active product status, providing strong supply chain continuity. DTC123JET1G (onsemi) in SC-75 packaging offers comparable availability (260,400 pcs) with direct package compatibility.

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