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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

NXP Semiconductors PDTC124EK,115

Name: PDTC124EK,115
Brand: NXP Semiconductors
SKU: PDTC124EK,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PDTC124EK,115

Manufacturer:: NXP Semiconductors

Category:: Single, Pre-Biased Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PDTC124EK,115.pdf

Description:: TRANS PREBIAS NPN 50V 0.1A SMT3

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Product details

Overview

PDTC124EK,115 from NXP Semiconductors is an NPN resistor-equipped transistor with integrated 22 kΩ base bias resistors (R1 and R2), rated for 50 V V_CEO, 100 mA I_O, and housed in SOT346 (SC-59) surface-mount package. It functions as a single-chip switch for low-power digital interface and logic-level translation circuits.

For engineers reviewing the PDTC124EK,115 datasheet, PDTC124EK,115 pinout, PDTC124EK,115 application, or PDTC124EK,115 equivalent, key selection criteria include built-in bias network compatibility, SOT346 thermal performance (R_{th j-a} = 500 K/W), DC current gain (h_FE ≥ 60 at 5 mA), and input voltage thresholds (V_i(on) = 1.7 V typ, V_i(off) = 1.1 V typ).

Technical Context

This device integrates two precision 22 kΩ resistors (R1 between base and input, R2 between base and emitter) to form a monolithic digital transistor, eliminating external bias components. Its internal resistor ratio (R2/R1 = 1.0 ± 0.2) ensures stable turn-on/turn-off behavior across temperature.

The PDTC124EK,115 operates as a saturated switch with V_CEsat ≤ 150 mV at I_C = 10 mA / I_B = 0.5 mA and supports input voltage ranges from −10 V to +40 V, enabling robust interfacing with TTL, CMOS, and microcontroller GPIOs without level-shifting circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V maximum - supports switching of 24 V logic and industrial control signals without breakdown.
I_O (DC)	100 mA maximum - sufficient for driving LEDs, small relays, and logic buffers directly.
R1 / R2	22 kΩ ± 30% - provides fixed-current biasing that eliminates discrete resistor selection and layout effort.
h_FE	≥ 60 at V_CE = 5 V, I_C = 5 mA - ensures reliable saturation under typical microcontroller drive conditions.
V_i(on) / V_i(off)	1.7 V / 1.1 V typical - enables clean TTL-compatible switching with noise margin > 0.4 V.
P_tot	250 mW at T_amb ≤ 25 °C - defines power handling in standard FR4 PCB layouts with minimal copper area.
R_{th j-a}	500 K/W - indicates thermal derating requirement: max 50 °C ambient rise at full 250 mW dissipation.

Pinout & Package

PDTC124EK,115 is packaged in SOT346 (SC-59), a plastic surface-mounted 3-lead package measuring 3.1 × 1.7 × 1.3 mm (L × W × H), optimized for reflow soldering only.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Internal connection to R1 (22 kΩ) and R2 (22 kΩ); accepts logic-level input signal.
2	Emitter	Common emitter node; connects to ground or low-side return path in switching configurations.
3	Collector	Output terminal; sinks up to 100 mA when saturated; connects to load (e.g., LED anode or relay coil).

Key Features

Feature	Design Value
Built-in R1/R2 bias network	Eliminates two external resistors, reducing BOM count and PCB footprint by ~2.5 mm² per instance.
SOT346 package	Enables high-density placement on compact boards while maintaining 250 mW power capability and 500 K/W thermal resistance.
V_i(on) = 1.7 V typ	Guarantees reliable turn-on from 3.3 V microcontrollers without pull-up or level-shifter circuitry.
V_CEsat ≤ 150 mV	Minimizes conduction loss in low-voltage loads (e.g., 3.3 V LED strings), preserving system efficiency.
Input voltage range −10 V to +40 V	Supports direct connection to open-collector outputs, industrial sensors, and transient-prone control lines.

Applications

LED Driver Circuit	Microcontroller GPIO Interface
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU pins with no external bias components. IC Role / Device Role / Timing Role: Single-chip saturated switch replacing discrete BJT + two resistors. Use Value: Reduces component count by 3 parts per channel and eliminates manual resistor matching during assembly.	Use Scenario: Level-shifting and buffering between 5 V legacy peripherals and 3.3 V ARM Cortex-M controllers. IC Role / Device Role / Timing Role: Digital translator with defined V_i(on)/V_i(off) thresholds ensuring noise-immune logic transitions. Use Value: Prevents false triggering due to floating inputs and supports bidirectional signal conditioning without active ICs.
Logic Inverter Stage	Low-Power Relay Driver
Use Scenario: Implementing non-inverting or inverting logic gates in space-constrained embedded systems. IC Role / Device Role / Timing Role: Configurable switch with emitter-follower or common-emitter topology via PCB routing. Use Value: Enables gate count reduction in custom logic blocks without sacrificing propagation delay (< 50 ns typical).	Use Scenario: Activating 5 V, 70 mA coil relays in battery-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Low-quiescent-current driver with fast turn-off (ICEO < 1 μA) minimizing standby drain. Use Value: Extends battery life by limiting leakage current to sub-microamp levels when de-energized.

LED Driver Circuit

Microcontroller GPIO Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU pins with no external bias components.

IC Role / Device Role / Timing Role: Single-chip saturated switch replacing discrete BJT + two resistors.

Use Value: Reduces component count by 3 parts per channel and eliminates manual resistor matching during assembly.

Use Scenario: Level-shifting and buffering between 5 V legacy peripherals and 3.3 V ARM Cortex-M controllers.

IC Role / Device Role / Timing Role: Digital translator with defined V_i(on)/V_i(off) thresholds ensuring noise-immune logic transitions.

Use Value: Prevents false triggering due to floating inputs and supports bidirectional signal conditioning without active ICs.

Logic Inverter Stage

Low-Power Relay Driver

Use Scenario: Implementing non-inverting or inverting logic gates in space-constrained embedded systems.

IC Role / Device Role / Timing Role: Configurable switch with emitter-follower or common-emitter topology via PCB routing.

Use Value: Enables gate count reduction in custom logic blocks without sacrificing propagation delay (< 50 ns typical).

Use Scenario: Activating 5 V, 70 mA coil relays in battery-powered IoT sensor nodes.

IC Role / Device Role / Timing Role: Low-quiescent-current driver with fast turn-off (ICEO < 1 μA) minimizing standby drain.

Use Value: Extends battery life by limiting leakage current to sub-microamp levels when de-energized.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN resistor-equipped transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PDTC114EK,115	R1 = 10 kΩ, R2 = 10 kΩ - higher base current, lower V_i(on) (1.4 V typ).	Better suited for 1.8 V logic families; less margin for noisy 3.3 V environments.	Select when driving from ultra-low-voltage MCUs or requiring faster switching at cost of higher input current.
MMBT3904LT1G	No built-in resistors - requires external R_B and R_E; h_FE = 100–300; V_CEO = 40 V.	Higher gain but increased design complexity and board area; not drop-in compatible.	Choose when precise gain control or higher collector voltage tolerance is required, accepting added component count.

Compared with PDTC124EK,115, PDTC114EK,115 offers lower input threshold for 1.8 V systems but reduced noise immunity, while MMBT3904LT1G delivers higher h_FE and voltage rating at the expense of external biasing and layout overhead.

Availability

PDTC124EK,115 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface modules, and low-power relay control applications requiring stable component supply and long-term manufacturability.

Supply support for PDTC124EK,115 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.

The PDTC124EK,115 belongs to NXP's resistor-equipped transistor product line, engineered to simplify digital switching designs by integrating precision bias networks into standardized SMD packages for high-volume manufacturing.

FAQ

What is the maximum continuous collector current for PDTC124EK,115?

The PDTC124EK,115 has a maximum DC output current (I_O) of 100 mA, verified under standard mounting conditions with ambient temperature ≤25 °C. This rating applies to steady-state switching operation; peak current remains limited to 100 mA per IEC 60134 limiting values. Derating is required above 25 °C ambient per its 500 K/W thermal resistance.

Does PDTC124EK,115 require external bias resistors?

No, PDTC124EK,115 does not require external bias resistors. It integrates two 22 kΩ resistors (R1 and R2) internally - R1 connects the input to the base, and R2 connects the base to the emitter - forming a complete digital transistor structure. This eliminates the need for discrete bias components in most logic-level switching applications.

What is the pin configuration of PDTC124EK,115 in the SOT346 package?

The PDTC124EK,115 uses a standardized SOT346 (SC-59) pinout: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This configuration is confirmed in the "Simplified outline, symbol and pinning" section of the official NXP datasheet and matches the mechanical drawing for SOT346 outlined on page 8.

Can PDTC124EK,115 be used with 1.8 V logic inputs?

PDTC124EK,115 has a typical input-on voltage (V_i(on)) of 1.7 V, making it borderline functional with 1.8 V logic, but its minimum guaranteed V_i(on) is not specified. For reliable 1.8 V operation, NXP recommends PDTC114EK,115 (V_i(on) = 1.4 V typ) instead. The PDTC124EK,115 is best suited for 3.3 V and 5 V logic families.

What is the thermal resistance junction-to-ambient for PDTC124EK,115?

The thermal resistance from junction to ambient (R_{th j-a}) for PDTC124EK,115 in its SOT346 package is 500 K/W under standard mounting conditions in free air. This value assumes a typical FR4 PCB layout with minimal copper area; adding thermal pads or copper pours can improve heat dissipation and reduce effective R_{th j-a}.

PDTC124EK,115 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN - Pre-Biased

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Resistor - Base (R1):: 22 kOhms

Resistor - Emitter Base (R2):: 22 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 60 @ 5mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 150mV @ 500µA, 10mA

Current - Collector Cutoff (Max):: 1µA

Frequency - Transition:: -

Power - Max:: 250 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMT3; MPAK

PDTC124EK,115 FAQ

1.How can I place an order for PDTC124EK,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for PDTC124EK,115 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PDTC124EK,115 reliable?

The price and inventory of PDTC124EK,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC124EK,115 is usually 5 days.

3.What payment methods are accepted for PDTC124EK,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC124EK,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PDTC124EK,115?

PDTC124EK,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PDTC124EK,115 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PDTC124EK,115?

For technical support, including PDTC124EK,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC124EK,115 requirements.

6.How does Aetrix verify that PDTC124EK,115 is sourced from the original manufacturer or authorized distributors?

All PDTC124EK,115 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PDTC124EK,115 meets industry standards.

7.What is the process for return or replacement of PDTC124EK,115?

All PDTC124EK,115 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC124EK,115, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PDTC124EK,115 part is unused and in its original packaging.

Return procedure for PDTC124EK,115:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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