PDTA115TE,115 Pre-Biased PNP Transistor Equivalent & Substitute Parts

Part Overview

The PDTA115TE,115 is a pre-biased PNP bipolar junction transistor manufactured by NXP USA Inc., designed for surface mount applications in the SC-75 (SOT-416) package. This device integrates internal biasing resistors to simplify circuit design and reduce component count in switching and amplification applications.

The PDTA115TE,115 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute devices must maintain electrical compatibility across critical parameters including collector current rating, breakdown voltage, base resistance configuration, and saturation characteristics.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Pre-Biased	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Resistor - Base (R1)	100	kOhms
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 1mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	150	mV @ 250µA, 5mA
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 eligibility for the PDTA115TE,115 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Transistor type: PNP - Pre-Biased configuration
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 50 V
Base resistor value (R1): 100 kOhms (primary criterion for pre-biased configuration)
DC current gain minimum: 100 @ 1mA, 5V
Vce saturation maximum: 150 mV @ 250µA, 5mA
Maximum collector cutoff current: 1 µA
Power dissipation: 150 mW minimum

Package Compatibility: Substitutes are grouped by package type. Direct pin-compatible replacements maintain SC-75 (SOT-416) packaging. Alternative packages (SOT-23-3, SOT-323, SOT-883, DFN) require PCB layout modification but maintain electrical equivalence.

Compliance Requirements: All substitute parts must maintain RoHS3 compliance, MSL Level 1 rating, and REACH unaffected status to ensure regulatory and environmental compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	R1 (kOhms)	hFE Min @ 1mA, 5V	Vce Sat Max (mV)	Icbo Max (µA)	Power Max (mW)	Package	Status
PDTA115TE,115	NXP USA Inc.	100	50	100	100	150	1	150	SC-75	Obsolete
DDTA115TCA-7-F	Diodes Incorporated	100	50	100	100	300	0.5	200	SOT-23-3	Active
DTA114TETL	Rohm Semiconductor	100	50	10	100	300	0.5	150	SC-75	Active
DTA115EET1G	onsemi	100	50	100	80	250	0.5	200	SC-75	Active
DTA115TET1G	onsemi	100	50	100	160	250	0.5	200	SC-75	Last Time Buy
DTA143TETL	Rohm Semiconductor	100	50	4.7	100	300	0.5	150	SC-75	Active
PDTA115TM,315	Nexperia USA Inc.	100	50	100	100	150	1	250	SOT-883	Active
PDTA115TMB,315	NXP USA Inc.	100	50	100	100	150	1	250	DFN1006B-3	Active
PDTA115TT,215	Nexperia USA Inc.	100	50	100	100	150	1	250	SOT-23-3	Active
PDTA115TU,115	Nexperia USA Inc.	100	50	100	100	150	1	200	SOT-323	Active

Engineering Selection Recommendations

Direct Package Equivalents (SC-75 / SOT-416):

DTA115EET1G and DTA115TET1G (onsemi) provide pin-compatible replacements in the original SC-75 package. Both devices maintain the 100 kOhms base resistor configuration and 50 V breakdown voltage. DTA115EET1G is in active production status with high inventory availability (35,300 pcs). DTA115TET1G carries Last Time Buy status, indicating limited future availability. Both parts are RoHS3 compliant with MSL Level 1 rating.

Automotive-Qualified Alternatives:

PDTA115TT,215 (Nexperia USA Inc.) in SOT-23-3 package and PDTA115TU,115 in SOT-323 package both carry AEC-Q100 automotive qualification. These devices maintain identical electrical parameters to the original part (100 kOhms R1, 100 mA Ic, 50 V Vce) and are actively produced. PDTA115TT,215 offers higher power dissipation (250 mW vs. 150 mW) and is suitable for applications requiring thermal margin.

Compact Package Options:

PDTA115TMB,315 (NXP USA Inc.) in DFN1006B-3 package provides the smallest footprint with 250 mW power rating and 180 MHz transition frequency. PDTA115TM,315 in SOT-883 package offers similar electrical performance with automotive qualification. Both require PCB layout redesign but maintain full electrical equivalence.

Alternative Base Resistor Configurations:

DTA114TETL (Rohm Semiconductor) and DTA143TETL (Rohm Semiconductor) feature different internal base resistor values (10 kOhms and 4.7 kOhms respectively). These parts are not direct substitutes for the PDTA115TE,115 due to altered biasing characteristics. Selection of these alternatives requires circuit re-evaluation and is not recommended for direct replacement without design modification.

Supply Chain Continuity:

DDTA115TCA-7-F (Diodes Incorporated) in SOT-23-3 package provides an alternative source with 3,090 pcs inventory. This device maintains 100 kOhms base resistor and 100 mA collector current but exhibits higher Vce saturation (300 mV vs. 150 mV). Application-specific evaluation is required before selection.

Frequently Asked Questions (FAQ)

Q: Can DTA114TETL or DTA143TETL be used as direct replacements for PDTA115TE,115?

A: No. While these devices share the same collector current (100 mA), breakdown voltage (50 V), and package (SC-75), their internal base resistor values differ significantly (10 kOhms and 4.7 kOhms respectively versus 100 kOhms in the original part). The base resistor directly determines the biasing characteristics and switching behavior of pre-biased transistors. Direct substitution will alter circuit performance and is not permitted without complete circuit re-design and validation.

Q: What is the difference between SC-75 and SOT-23-3 packages?

A: SC-75 (SOT-416) and SOT-23-3 (TO-236-3, SC-59) are both three-terminal surface mount packages but differ in physical dimensions and pin spacing. SC-75 is larger with 2.0 mm pitch, while SOT-23-3 uses 1.9 mm pitch. Devices in SOT-23-3 package (PDTA115TT,215, DDTA115TCA-7-F) require PCB footprint modification and cannot be used as drop-in replacements without layout redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring regulatory equivalence and compatibility with standard manufacturing processes.

Q: What does "Last Time Buy" status mean for DTA115TET1G?

A: Last Time Buy indicates that onsemi has announced end-of-life for this part number. While currently available (15,536 pcs in stock), production will cease and future availability cannot be guaranteed. For new designs or long-term production requirements, selection of actively produced alternatives (DTA115EET1G, PDTA115TT,215, or PDTA115TU,115) is recommended.

Q: Can PDTA115TMB,315 in DFN1006B-3 package be used in existing designs?

A: PDTA115TMB,315 maintains full electrical equivalence to PDTA115TE,115 but requires PCB layout modification due to different package geometry. The DFN1006B-3 package is significantly smaller than SC-75, offering space savings and improved thermal performance (250 mW vs. 150 mW). Implementation requires PCB redesign, assembly process validation, and thermal analysis. This option is suitable for new product development or design revisions where layout flexibility exists.

Q: What is the significance of the 100 kOhms base resistor specification?

A: The internal base resistor (R1) is the primary parameter defining pre-biased transistor behavior. The 100 kOhms value in PDTA115TE,115 establishes the biasing network that determines turn-on voltage, switching speed, and circuit stability. Substitutes must maintain this value to preserve circuit function. Parts with different R1 values (DTA114TETL with 10 kOhms, DTA143TETL with 4.7 kOhms) exhibit fundamentally different biasing characteristics and are not interchangeable.

Q: Are automotive-qualified parts (PDTA115TT,215, PDTA115TU,115) suitable for non-automotive applications?

A: Yes. Automotive-qualified parts with AEC-Q100 certification exceed standard reliability requirements and are fully compatible with non-automotive applications. These devices provide enhanced quality assurance and extended temperature range capability, making them suitable for demanding industrial and consumer applications.

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