PDTC143TU Nexperia Integrated Circuit (SOT23 (3-Pin)) In Stock
Nexperia PDTC143TU is an NPN digital transistor with built-in 4.7 kΩ base bias resistors, rated at 100 mA collector current and 50 V, in a compact 3-pin SOT-323 package that eliminates external resistors. Available from stock with worldwide shipping.
- Manufacturer
- Nexperia
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- PDTC143TU Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Built-in 4.7 kΩ base bias resistors eliminate external discrete components, reducing BOM count and PCB area in digital switching circuits
- 100 mA / 50 V NPN transistor with minimum hFE of 200 provides reliable TTL and CMOS logic-level switching without additional base drive circuitry
- Compact SOT-323 (UMT) 3-pin package occupies minimal PCB space, ideal for high-density mobile, wearable, and IoT board designs
Applications
The PDTC143TU is ideal for microcontroller GPIO-driven switching applications such as LED drivers, relay coil drivers, and level shifters, where the built-in 4.7 kΩ base resistor allows direct connection to 3.3 V or 5 V logic outputs without an external series resistor. Its 50 V, 100 mA ratings suit small inductive load switching in sensor modules, alarm systems, and consumer electronics that require a compact single-transistor solution. The SOT-323 footprint makes it suitable for portable devices and space-constrained PCB designs where minimizing component count is critical.
Specifications
| Date Of Intro | 1999-05-21 |
| YTEOL | 7 |
| Additional Feature | BUILT-IN BIAS RESISTORS |
| Collector Current-Max (IC) | 0.1A |
| Collector-Emitter Voltage-Max | 50V |
| Configuration | SINGLE WITH BUILT-IN RESISTOR |
| DC Current Gain-Min (hFE) | 200 |
| JESD-30 Code | R-PDSO-G3 |
| JESD-609 Code | e3 |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Polarity/Channel Type | NPN |
| Surface Mount | YES |
| Terminal Finish | TIN |
| Terminal Form | GULL WING |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transistor Application | SWITCHING |
| Transistor Element Material | SILICON |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the built-in 4.7 kΩ base resistor in the PDTC143TU simplify digital switching circuit design?
The integrated 4.7 kΩ base resistor sets the base drive current automatically when connected to a 3.3 V logic output, delivering approximately 0.5 mA of base current, which is sufficient to saturate the transistor at collector currents up to 100 mA given the minimum hFE of 200. This eliminates one discrete resistor per transistor stage, reducing BOM count and freeing 1–2 mm² of PCB space per switch position in multi-channel LED driver arrays.
Which GPIO-driven load switching applications benefit most from the PDTC143TU's 50 V, 100 mA ratings?
The 50 V collector-emitter breakdown voltage and 100 mA maximum collector current make the PDTC143TU suitable for switching small relay coils (typically 12–24 V at 30–80 mA), single-color LEDs at up to 100 mA drive current, buzzer elements, and open-collector sensor pull-up circuits. Applications in alarm systems, home automation nodes, and wearable device haptic drivers can connect the transistor directly to a microcontroller GPIO without additional drive circuitry.
How does the PDTC143TU compare to a discrete 2N3904 plus external base resistor, and when is the integrated solution preferred?
A 2N3904 requires an external 4.7 kΩ base resistor, adding one component, one PCB pad pair, and additional placement time per switching stage. The PDTC143TU integrates both in a single SOT-323 package measuring approximately 2.1 mm × 1.25 mm, versus the 2.9 mm × 1.3 mm SOT-23 body of a 2N3904 plus a 0402 resistor occupying another 1.0 mm × 0.5 mm. For PCBs with 10 or more switching stages, the integrated solution saves roughly 10–20 mm² of board area and reduces assembly placement steps.
What is the minimum DC current gain (hFE) of the PDTC143TU and how does it affect saturation voltage in low-side switch designs?
The PDTC143TU specifies a minimum hFE of 200 at 2 mA collector current. In a low-side switch driven from a 3.3 V GPIO through the internal 4.7 kΩ resistor (approximately 0.5 mA base current), the transistor is driven into saturation with a base overdrive ratio greater than 5:1 for collector currents up to 50 mA, keeping the collector-emitter saturation voltage below approximately 200 mV and ensuring the driven load receives close to the full supply voltage.
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