PDTC124XE,115 Equivalent & Substitute Parts

Part Overview

The PDTC124XE,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, enabling direct logic-level switching applications without external biasing networks. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity.

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)	22	kOhms
Emitter-Base Resistor (R2)	47	kOhms
DC Current Gain (hFE Min)	80 @ 5mA, 5V	—
Vce Saturation (Max)	150	mV
Maximum Power Dissipation	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 PDTC124XE,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 (exact match required for logic-level switching)
Emitter-base resistor (R2): 47 kOhms (exact match required for switching characteristics)
DC current gain (hFE): minimum 80 @ specified test conditions
Vce saturation: 150 mV or lower for switching performance

Mechanical Compatibility Requirements:

Surface mount packaging
SC-75 (SOT-416) package or functionally equivalent packages (SOT-323, SOT-23-3, SOT-523, EMT3, SOT-883)

Compliance Requirements:

RoHS3 compliance
MSL rating of 1 (Unlimited)

Substitutes are grouped into two categories: direct package equivalents (SC-75/SOT-416) and alternative package options (smaller form factors with identical electrical specifications). Alternative packages require PCB layout modification but maintain full electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	R1 kOhms	R2 kOhms	hFE Min @ Test	Vce Sat (Max) mV	Power (Max) mW	Package	Status
PDTC124XE,115	NXP USA Inc.	100	50	22	47	80 @ 5mA, 5V	150	150	SC-75, SOT-416	Obsolete
DTC124XET1G	onsemi	100	50	22	47	80 @ 5mA, 10V	250	200	SC-75, SOT-416	Active
DTC124EET1G	onsemi	100	50	22	22	60 @ 5mA, 10V	250	200	SC-75, SOT-416	Active
DTC124XETL	Rohm Semiconductor	50	50	22	47	68 @ 5mA, 5V	300	150	SC-75, SOT-416	Active
DTC024XEBTL	Rohm Semiconductor	100	50	22	47	80 @ 5mA, 10V	150	150	SC-89, SOT-490	Active
PDTC124XM,315	Nexperia USA Inc.	100	50	22	47	80 @ 5mA, 5V	150	250	SC-101, SOT-883	Active
DDTC124TCA-7-F	Diodes Incorporated	100	50	22	—	100 @ 1mA, 5V	300	200	TO-236-3, SOT-23-3	Active
DDTC124GUA-7-F	Diodes Incorporated	100	50	—	22	56 @ 5mA, 5V	300	200	SC-70, SOT-323	Active
DDTC124TUA-7-F	Diodes Incorporated	100	50	22	—	100 @ 1mA, 5V	300	200	SC-70, SOT-323	Active
DDTC124TE-7-F	Diodes Incorporated	100	50	22	—	100 @ 1mA, 5V	300	150	SOT-523	Active
DTC143XETL	Rohm Semiconductor	100	50	4.7	10	30 @ 10mA, 5V	300	150	SC-75, SOT-416	Active

Engineering Selection Recommendations

Direct Package Equivalents (SC-75/SOT-416 - No PCB Modification Required):

The following parts maintain identical or superior electrical performance within the original SC-75 package footprint:

DTC124XET1G (onsemi): Active status. Matches all critical parameters (Ic 100 mA, Vce(br) 50 V, R1 22 kOhms, R2 47 kOhms). Increased power rating (200 mW vs. 150 mW) and higher Vce saturation (250 mV) are acceptable for most applications. RoHS3 compliant, MSL 1.
PDTC124XM,315 (Nexperia USA Inc.): Active status. Identical electrical specifications to PDTC124XE,115. Automotive-grade qualification (AEC-Q100). Increased power rating (250 mW). RoHS3 compliant, MSL 1. Recommended for automotive and high-reliability applications.
DTC024XEBTL (Rohm Semiconductor): Active status. Matches all critical parameters. Functionally equivalent in SC-89 (SOT-490) package. RoHS3 compliant, MSL 1.

Alternative Package Options (Smaller Form Factors - PCB Layout Modification Required):

DDTC124TCA-7-F (Diodes Incorporated): Active status. SOT-23-3 package. Maintains 100 mA collector current and 50 V breakdown voltage. Base resistor matches (22 kOhms). Higher hFE (100 min) and increased Vce saturation (300 mV). RoHS3 compliant, MSL 1.
DDTC124TUA-7-F (Diodes Incorporated): Active status. SOT-323 package. Maintains 100 mA collector current and 50 V breakdown voltage. Base resistor matches (22 kOhms). Higher hFE (100 min) and increased Vce saturation (300 mV). RoHS3 compliant, MSL 1.
DDTC124TE-7-F (Diodes Incorporated): Active status. SOT-523 package. Maintains 100 mA collector current and 50 V breakdown voltage. Base resistor matches (22 kOhms). Matches original power rating (150 mW). RoHS3 compliant, MSL 1.

Not Recommended:

DTC124XETL (Rohm Semiconductor): Reduced collector current rating (50 mA vs. 100 mA). Suitable only for applications with lower current requirements.
DTC143XETL (Rohm Semiconductor): Different base and emitter resistor values (R1 4.7 kOhms, R2 10 kOhms). Significantly lower hFE (30 min). Not a direct substitute; requires circuit redesign.
DDTC124GUA-7-F (Diodes Incorporated): Emitter-base resistor differs (22 kOhms vs. 47 kOhms). Lower hFE (56 min). Not a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can DTC124XET1G replace PDTC124XE,115 in existing designs without modification?

A: Yes. DTC124XET1G is a direct package equivalent in SC-75 (SOT-416). All critical electrical parameters match: 100 mA collector current, 50 V breakdown voltage, 22 kOhms base resistor, and 47 kOhms emitter-base resistor. The increased power rating (200 mW vs. 150 mW) and slightly higher Vce saturation (250 mV vs. 150 mV) are within acceptable tolerances for standard switching applications. No PCB modification is required.

Q: What is the difference between PDTC124XM,315 and PDTC124XE,115?

A: PDTC124XM,315 is the active equivalent manufactured by Nexperia USA Inc. (formerly NXP). Electrical specifications are identical. The primary difference is product status (active vs. obsolete) and automotive qualification (AEC-Q100). PDTC124XM,315 is packaged in SOT-883 (SC-101), a smaller form factor requiring PCB layout modification. Power rating is increased to 250 mW.

Q: Can I use DDTC124TCA-7-F as a substitute if I modify my PCB layout?

A: Yes, with design verification. DDTC124TCA-7-F maintains the 100 mA collector current and 50 V breakdown voltage. The base resistor (22 kOhms) matches the original. However, the emitter-base resistor value is not specified in the datasheet, and hFE is higher (100 min vs. 80 min). Vce saturation is increased to 300 mV. These differences may affect switching speed and logic-level compatibility. Circuit simulation or prototype testing is necessary to confirm suitability for your specific application.

Q: Why do some substitutes have different hFE values?

A: DC current gain (hFE) varies between manufacturers and process technologies. Higher hFE values (e.g., 100 vs. 80) indicate stronger base drive capability, resulting in faster switching and lower Vce saturation. For pre-biased transistors with integrated resistors, hFE variations are compensated by the resistor network. Substitutes with higher hFE are generally acceptable and may improve performance.

Q: What is the significance of the emitter-base resistor (R2) value?

A: The emitter-base resistor (R2) determines the switching threshold and input impedance. The original PDTC124XE,115 specifies 47 kOhms. Substitutes with identical R2 values (DTC124XET1G, PDTC124XM,315, DTC024XEBTL) are direct electrical equivalents. Substitutes with different or unspecified R2 values (DDTC124GUA-7-F with 22 kOhms) have different switching characteristics and require application verification.

Q: Can I use DDTC124TE-7-F in space-constrained applications?

A: Yes. DDTC124TE-7-F is packaged in SOT-523, the smallest available form factor among the listed substitutes. It maintains the original 100 mA collector current, 50 V breakdown voltage, 22 kOhms base resistor, and 150 mW power rating. The SOT-523 package requires PCB layout modification. Verify that your PCB design tools and assembly process support SOT-523 components.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with MSL rating of 1 (Unlimited moisture sensitivity). They meet the same environmental and regulatory requirements as the original PDTC124XE,115.

Q: What is the difference between SC-75 and SOT-416 package designations?

A: SC-75 and SOT-416 refer to the same physical package. SC-75 is the JEDEC designation; SOT-416 is the IEC designation. Both describe a three-lead surface mount package with identical footprint and pinout. Parts specified as SC-75 or SOT-416 are mechanically and electrically interchangeable.

Q: Should I select PDTC124XM,315 for new automotive designs?

A: Yes. PDTC124XM,315 is recommended for automotive applications due to AEC-Q100 qualification. It provides identical electrical performance to the original PDTC124XE,115 with active product status and higher power rating (250 mW). The SOT-883 package is smaller than SC-75, requiring PCB layout modification. Verify that your automotive design guidelines accept SOT-883 packaging.

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