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

Nexperia USA Inc. PDTC143TU/ZLX

Name: PDTC143TU/ZLX
Brand: Nexperia USA Inc.
SKU: PDTC143TU/ZLX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PDTC143TU/ZLX

Manufacturer:: Nexperia USA Inc.

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: PDTC143TU/ZLX.pdf

Description:: TRANS PREBIAS

Quantity:: RFQ Add To RFQ list

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Inventory:9,344

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Product details

Overview

PDTC143TU/ZLX from Nexperia is an NPN resistor-equipped transistor (RET) with integrated 4.7 kΩ base bias resistor (R1), open R2 configuration, 50 V V_CEO, 100 mA I_O, and SOT323 (SC-70) package - used for compact logic-level switching in portable power management and signal interface circuits.

For engineers reviewing the PDTC143TU/ZLX datasheet, PDTC143TU/ZLX pinout, PDTC143TU/ZLX application, or PDTC143TU/ZLX equivalent, key selection criteria include built-in biasing, thermal resistance (625 K/W), DC current gain (h_FE ≥ 200 at I_C = 1 mA), V_CEsat ≤ 100 mV, and compatibility with reflow-only assembly.

Technical Context

This RET integrates a single 4.7 kΩ pull-up resistor between base and input terminal, eliminating external bias components. It operates as a digitally controlled switch with fixed gain architecture, optimized for low-voltage CMOS/TTL interfacing where base drive current simplification is critical.

The device uses standard NPN epitaxial planar technology with silicon die in a leaded plastic SOT323 package. Its open R2 topology means no internal emitter-base feedback resistor, resulting in predictable saturation behavior under defined I_B/I_C conditions and minimal leakage (I_CEO ≤ 1 μA).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - supports rail-to-rail switching up to 5 V logic with margin for transient spikes
I_O	100 mA - sufficient for driving LEDs, small relays, or logic gate inputs without external amplification
R1	4.7 kΩ ±25% - sets base current for predictable turn-on with 3.3 V/5 V microcontroller outputs
h_FE	≥200 at V_CE = 5 V, I_C = 1 mA - ensures robust saturation with low base drive overhead
V_CEsat	≤100 mV at I_C = 5 mA, I_B = 0.25 mA - minimizes conduction loss in battery-powered load switching
R_th(j-a)	625 K/W - requires careful PCB copper area planning for sustained >50 mA operation in ambient >50 °C
P_tot	200 mW at T_amb ≤ 25 °C - defines maximum continuous DC power dissipation in free air

Pinout & Package

PDTC143TU/ZLX is housed in a plastic surface-mounted SOT323 (SC-70) package measuring 2.2 × 1.35 × 0.95 mm, with gull-wing leads and moisture sensitivity level (MSL) 1 per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Input node connected to internal R1	Accepts logic-level voltage; R1 pulls base high when input is open or high-impedance
2 (Emitter)	Reference terminal for bias network	Connected to ground or low-side return path; forms common-emitter switching node
3 (Collector)	Output current sink terminal	Drives loads (e.g., LED cathode, relay coil) to V_CC; current flows from collector to emitter

Key Features

Feature	Design Value
Built-in 4.7 kΩ base resistor	Eliminates need for discrete bias resistor, reducing BOM count by one component and saving 0.5–1.0 mm² PCB area
Open R2 configuration	Prevents unintended emitter feedback, ensuring stable DC operating point in digital on/off applications
Low V_CEsat (≤100 mV)	Reduces power loss to <0.5 mW at 5 mA load, critical for extended battery life in wearables and IoT sensors
SOT323 footprint	Enables high-density placement in space-constrained designs such as USB-C accessories and smart card readers
Reflow-solder only	Guarantees mechanical reliability and interconnect integrity when processed per JEDEC J-STD-020 MSL 1 profile

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving indicator LEDs from 3.3 V MCU GPIO pins with current limiting via collector resistor.

IC Role / Device Role / Timing Role: NPN switch providing low-side current sink with integrated biasing.

Use Value: Eliminates external base resistor, reduces layout complexity, and ensures consistent LED brightness across production units.

Use Scenario: Adding extra digital output capability to resource-constrained MCUs via discrete transistor buffering.

IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between MCU I/O and higher-current peripherals.

Use Value: Enables reliable 100 mA switching without degrading MCU pin lifetime or requiring dedicated port expanders.

Logic-Level Signal Inverter

Low-Power Sensor Interface

Use Scenario: Converting active-high sensor alerts to active-low interrupt signals compatible with legacy ASIC inputs.

IC Role / Device Role / Timing Role: Digital inverter stage with fixed gain and sub-100 ns propagation delay.

Use Value: Provides clean signal polarity reversal with no timing skew introduced by external passive networks.

Use Scenario: Enabling/disabling analog sensor power rails based on system sleep state in battery-operated environmental monitors.

IC Role / Device Role / Timing Role: Low-leakage enable switch controlling V_DD to sensor ICs.

Use Value: Achieves <1 μA standby current (ICEO) while maintaining fast wake-up response (<1 μs turn-on time).

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
PDTC143TK	SOT346 (SC-59) package; 500 K/W thermal resistance; same R1/h_FE/V_CEO	Larger footprint; better thermal performance for sustained >50 mA loads	Select when board space allows and thermal derating above 60 °C ambient is required
PDTC143TT	SOT23 package; 500 K/W thermal resistance; identical electrical specs but different pinout (1=base, 2=collector, 3=emitter)	Requires PCB redesign due to collector/emitter pin swap; higher power handling than SOT323	Choose only if existing SOT23 land pattern is reused and pinout compatibility is verified

Compared with PDTC143TK and PDTC143TT, PDTC143TU/ZLX offers the smallest footprint and highest board density, but requires stricter thermal management above 50 mA - making it optimal for ultra-compact, intermittently loaded applications like button debouncing or status indication.

Availability

PDTC143TU/ZLX is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, logic-level signal inversion, and low-power sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for PDTC143TU/ZLX 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 leader in high-volume discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

PDTC143TU/ZLX belongs to the PDTC143T series of NPN resistor-equipped transistors - designed specifically to simplify digital interface design by integrating bias resistors while maintaining compatibility with standard SMT assembly processes.

FAQ

What is the function of the internal 4.7 kΩ resistor in PDTC143TU/ZLX?

The internal 4.7 kΩ resistor (R1) connects between the base and input terminal, providing automatic base biasing when driven by logic-level voltages. It eliminates the need for an external pull-up resistor, enabling direct connection to MCU GPIO pins and reducing component count. This resistor sets the base current for predictable saturation under standard 3.3 V or 5 V drive conditions.

Can PDTC143TU/ZLX be used in linear amplifier applications?

No - PDTC143TU/ZLX is optimized for digital switching, not analog amplification. Its fixed R1 value and lack of R2 feedback limit bias point adjustability, and its h_FE variation across temperature and current makes it unsuitable for stable small-signal gain. The datasheet specifies only switching parameters (V_CEsat, I_O, t_on/t_off) and explicitly lists "general purpose switching" as the primary application.

Is PDTC143TU/ZLX RoHS compliant and halogen-free?

Yes - PDTC143TU/ZLX meets RoHS Directive 2011/65/EU and is halogen-free per Nexperia's standard product compliance policy. The "ZLX" suffix indicates lead-free (Pb-free) terminations and green molding compound. Full compliance documentation, including test reports and declarations, is available through Nexperia's official product portal using the full orderable part number.

What is the maximum continuous collector current at 85 °C ambient temperature?

At T_amb = 85 °C, the maximum continuous collector current is approximately 65 mA. This is derived from the 200 mW P_tot rating and thermal resistance of 625 K/W: allowable power = 200 mW × (1 − (85−25)/150) ≈ 120 mW; then I_C = √(P_tot/R_CE) ≈ 65 mA assuming typical V_CEsat of 0.1 V. Derating curves confirm this value in Nexperia's application note AN10273.

PDTC143TU/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:: -

PDTC143TU/ZLX FAQ

1.How can I place an order for PDTC143TU/ZLX through Aetrix?

Please submit a Request for Quotation (RFQ) for PDTC143TU/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 PDTC143TU/ZLX reliable?

The price and inventory of PDTC143TU/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC143TU/ZLX is usually 5 days.

3.What payment methods are accepted for PDTC143TU/ZLX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC143TU/ZLX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PDTC143TU/ZLX?

PDTC143TU/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PDTC143TU/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 PDTC143TU/ZLX?

For technical support, including PDTC143TU/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC143TU/ZLX requirements.

6.How does Aetrix verify that PDTC143TU/ZLX is sourced from the original manufacturer or authorized distributors?

All PDTC143TU/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 PDTC143TU/ZLX meets industry standards.

7.What is the process for return or replacement of PDTC143TU/ZLX?

All PDTC143TU/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PDTC143TU/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 PDTC143TU/ZLX part is unused and in its original packaging.

Return procedure for PDTC143TU/ZLX:

1.Submit a request within 90 days.

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

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