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

Nexperia USA Inc. PDTC144EU/ZLX

Name: PDTC144EU/ZLX
Brand: Nexperia USA Inc.
SKU: PDTC144EU/ZLX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PDTC144EU/ZLX

Manufacturer:: Nexperia USA Inc.

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: PDTC144EU/ZLX.pdf

Description:: TRANS PREBIAS

Quantity:: RFQ Add To RFQ list

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Inventory:3,766

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Product details

Overview

PDTC144EU from Nexperia is an NPN resistor-equipped transistor (RET) in SOT323 (SC-70) package, designed for digital switching with 50 V V_CEO, 100 mA I_O, and integrated bias resistors R1 = R2 = 47 kΩ. It replaces discrete base-resistor + BJT combinations in load control and IC input driving applications across industrial digital systems.

For engineers reviewing the PDTC144EU datasheet, PDTC144EU pinout, PDTC144EU application, or PDTC144EU equivalent, key selection criteria include guaranteed 50 V breakdown rating, built-in 1:1 R2/R1 ratio, 150 mV V_CEsat at 10 mA/0.5 mA drive, thermal resistance of 625 K/W on FR4, and SC-70 footprint compatibility with high-density PCB layouts.

Technical Context

This RET integrates a silicon NPN transistor with two precision laser-trimmed thin-film resistors - R1 connected between input and base, R2 from base to emitter - enabling single-pin logic-level control without external bias components. Its internal topology eliminates base current calculation and ensures consistent turn-on/off thresholds.

The device operates as a saturated switch under DC conditions with guaranteed h_FE ≥ 80 at 5 mA collector current and 5 V V_CE, while maintaining VI(on) ≤ 1.6 V and VI(off) ≥ 1.2 V at 25 °C. Thermal derating follows a defined 200 mW limit at 25 °C ambient, dropping linearly to zero at 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before breakdown; enables use in 24 V industrial bus and 3.3/5 V logic-controlled 36 V load circuits.
I_O	100 mA - Continuous output current capability; sufficient for driving LEDs, small relays, MOSFET gates, and logic inputs.
R1 / R2	47 kΩ / 47 kΩ - Matched internal bias resistors eliminate external component count and ensure predictable base drive under varying supply conditions.
V_CEsat	150 mV max at I_C = 10 mA, I_B = 0.5 mA - Low saturation voltage minimizes power loss and heat generation during switching.
h_FE	≥ 80 at V_CE = 5 V, I_C = 5 mA - Confirmed DC current gain ensures reliable saturation with standard microcontroller GPIO drive strength.
f_T	230 MHz typical - Transition frequency of the embedded transistor supports fast edge response in pulse-width modulated (PWM) control up to ~10 MHz.

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 3-terminal, 1.3 mm pitch, 2.0 mm × 1.25 mm × 0.95 mm body; optimized for reflow soldering on FR4 PCBs with standard 0.55 mm pad width and 1.325 mm center-to-center spacing.

Pin/Terminal	Circuit Role	Design Meaning
1	Input (base node)	Logic-level control terminal; connects internally to R1; accepts TTL/CMOS-compatible voltage signals without external pull-up/down.
2	Ground (emitter)	Reference node for both internal resistors and transistor emitter; must be tied to system ground for proper biasing and current return path.
3	Output (collector)	Switched high-side output node; sinks current from load to ground when active; rated for 50 V and 100 mA continuous operation.

Key Features

Feature	Design Value
Integrated R1 + R2 bias network	Eliminates need for two external resistors, reducing BOM count by 2 parts and saving >0.5 mm² PCB area per instance.
Matched R2/R1 ratio	1.0 ± 0.2 - Ensures stable base current division and repeatable switching thresholds across production lots and temperature ranges.
Low V_CEsat at rated current	≤ 150 mV guarantees <15 mW conduction loss at 100 mA, enabling thermally constrained designs without heatsinking.
SC-70 footprint compatibility	Standardized 3-pin SOT323 land pattern allows drop-in replacement of BC847-family transistors in existing layouts with no layout revision.

Applications

Industrial Digital Control

Microcontroller GPIO Expansion

Use Scenario: Driving optocoupler inputs in PLC I/O modules where space and component count are constrained.

IC Role / Device Role / Timing Role: NPN switch providing galvanically isolated signal translation from 3.3 V MCU outputs to 5–24 V field-side logic.

Use Value: Built-in biasing ensures consistent LED forward current across voltage tolerances and temperature drift, eliminating calibration overhead.

Use Scenario: Adding discrete on/off control channels to resource-limited microcontrollers lacking sufficient GPIO or PWM outputs.

IC Role / Device Role / Timing Role: Logic-level controlled load switch interfacing MCU pins directly to solenoids, buzzers, or indicator LEDs.

Use Value: 100 mA output current and 150 mV V_CEsat enable direct drive of common indicators without external driver stages.

Cost-Optimized Sensor Interface

Level-Shifting Signal Conditioning

Use Scenario: Converting open-collector sensor outputs (e.g., Hall effect, reed switches) to clean CMOS-compatible signals in factory automation sensors.

IC Role / Device Role / Timing Role: Active pull-up switch translating floating or pulled-low sensor states into rail-to-rail logic levels.

Use Value: Integrated R1/R2 provides fixed, temperature-stable pull-up strength without requiring precision external resistors.

Use Scenario: Shifting 1.8 V or 2.5 V logic signals to 3.3 V or 5 V domains in mixed-voltage industrial controllers.

IC Role / Device Role / Timing Role: Voltage-level translator using saturated switching mode to invert and scale logic thresholds.

Use Value: VI(on)/VI(off) specs guarantee clean transition between logic states even with marginal noise margins or slow-rising edges.

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
BC847B, SOT23	Discrete NPN BJT requiring two external bias resistors; no integrated R1/R2 network; higher assembly cost and larger footprint.	Requires additional PCB area and pick-and-place steps; suitable only when design flexibility or custom bias ratios are needed.	Select when precise tuning of base current or non-standard R2/R1 ratios (e.g., 10:1 for high-gain switching) is required.
PDTA144EU	PNP complement with identical R1/R2 values, 50 V V_ECO, and 100 mA output; same SOT323 package and pinout but reversed polarity.	Used for high-side switching or complementary logic stages where sourcing current is required instead of sinking.	Select for dual-NPN/PNP configurations or when implementing push-pull drivers with matched RET characteristics.

Compared with BC847B and PDTA144EU, PDTC144EU uniquely delivers integrated biasing in a minimal footprint while maintaining full compatibility with legacy SOT323 layouts - reducing total solution size and assembly cost without sacrificing electrical performance or thermal robustness.

Availability

PDTC144EU is available at Aetrix Electronics and suitable for industrial digital control, microcontroller GPIO expansion, cost-optimized sensor interface, and level-shifting signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for PDTC144EU 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

PDTC144EU belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, engineered to simplify digital switching designs by integrating precision bias resistors into miniature SOT packages for space-constrained and cost-sensitive applications.

FAQ

What is the maximum operating temperature for PDTC144EU?

The PDTC144EU has a maximum junction temperature (T_j) of 150 °C and an ambient operating range of −65 °C to +150 °C. Its thermal resistance is 625 K/W on standard FR4 PCBs, so sustained 100 mA operation requires attention to board copper area and airflow to avoid exceeding T_j.

Can PDTC144EU replace BC847 in existing designs without layout changes?

Yes - PDTC144EU uses the same SOT323 (SC-70) package and pinout (input-ground-output) as BC847 variants in SOT23, but with different terminal functions. Direct replacement requires verifying that the BC847 layout accommodates SC-70 dimensions (2.0 mm × 1.25 mm vs. SOT23's 2.9 mm × 1.3 mm) and adjusting for integrated biasing.

What is the significance of the R2/R1 ratio specification?

The R2/R1 ratio of 0.8–1.2 (typical 1.0) defines how base current splits between R1 and R2, directly determining the effective input impedance and threshold voltage. A ratio near unity ensures symmetric turn-on/turn-off behavior and stable operation across process and temperature variations.

Is PDTC144EU qualified for automotive applications?

No - PDTC144EU is explicitly marked as non-automotive qualified in its revision history and legal disclaimers. For automotive use, Nexperia offers the -Q qualified variants (e.g., PDTC144EU-Q), which undergo AEC-Q101 stress testing and include extended temperature and reliability validation.

PDTC144EU/ZLX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: -

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

Voltage - Collector Emitter Breakdown (Max):: -

Resistor - Base (R1):: -

Resistor - Emitter Base (R2):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

Frequency - Transition:: -

Power - Max:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

PDTC144EU/ZLX FAQ

1.How can I place an order for PDTC144EU/ZLX through Aetrix?

Please submit a Request for Quotation (RFQ) for PDTC144EU/ZLX 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 PDTC144EU/ZLX reliable?

The price and inventory of PDTC144EU/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC144EU/ZLX is usually 5 days.

3.What payment methods are accepted for PDTC144EU/ZLX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC144EU/ZLX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PDTC144EU/ZLX?

PDTC144EU/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PDTC144EU/ZLX 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 PDTC144EU/ZLX?

For technical support, including PDTC144EU/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC144EU/ZLX requirements.

6.How does Aetrix verify that PDTC144EU/ZLX is sourced from the original manufacturer or authorized distributors?

All PDTC144EU/ZLX 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 PDTC144EU/ZLX meets industry standards.

7.What is the process for return or replacement of PDTC144EU/ZLX?

All PDTC144EU/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PDTC144EU/ZLX, 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 PDTC144EU/ZLX part is unused and in its original packaging.

Return procedure for PDTC144EU/ZLX:

1.Submit a request within 90 days.

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

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