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NXP Semiconductors PDTC143ZS,126
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- Part No.:
- PDTC143ZS,126
- Manufacturer:
- NXP Semiconductors
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
PDTC143ZS,126.pdf
- Description:
- TRANS PREBIAS NPN 50V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,822
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Product details
Overview
PDTC143ZS from NXP Semiconductors (formerly Philips) is an NPN resistor-equipped transistor with integrated bias resistors R1 = 4.7 kΩ and R2 = 47 kΩ, rated for VCEO = 50 V and IO = 100 mA DC, housed in a through-hole SOT54 (TO-92) package. It serves as a simplified switching element in low-power digital interface and logic-level translation circuits.
For engineers reviewing the PDTC143ZS datasheet, PDTC143ZS pinout, PDTC143ZS application, or PDTC143ZS equivalent, this page delivers verified electrical parameters, confirmed TO-92 pinning, real-world switching use cases, and two validated alternative parts with documented functional differences.
Technical Context
The PDTC143ZS integrates two precision on-chip resistors to form a single-transistor digital switch with built-in base biasing - eliminating external resistors and reducing PCB footprint. Its fixed R1/R2 ratio of 10:1 ensures stable saturation under standard TTL/CMOS drive conditions.
Designed for DC-coupled switching rather than linear amplification, it features guaranteed VCE(sat) ≤ 100 mV at IC = 5 mA / IB = 0.25 mA and exhibits low input-off voltage (Vi(off) ≤ 0.6 V), enabling reliable turn-off with weak pull-down sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum collector-emitter voltage before breakdown; supports 24 V logic and industrial control rails. |
| IO (DC) | 100 mA - Continuous output current capability; sufficient for driving LEDs, small relays, and logic buffers. |
| R1 | 4.7 kΩ ±25% - Input resistor limiting base current; sets turn-on threshold and protects driver ICs. |
| R2 | 47 kΩ ±25% - Base-emitter feedback resistor ensuring fast turn-off and noise immunity. |
| VCE(sat) | ≤100 mV at IC=5 mA/IB=0.25 mA - Low saturation voltage minimizes power loss and heat rise in switching mode. |
| Ptot | 500 mW at Tamb ≤25 °C - Total power dissipation rating enables operation without heatsinking in ambient-temperature applications. |
| hFE | ≥100 at VCE=5 V, IC=10 mA - Minimum DC current gain ensures robust saturation across process and temperature variation. |
Pinout & Package
PDTC143ZS uses the SOT54 (TO-92) through-hole plastic package - a 3-lead, single-ended leaded outline with 2.54 mm lead pitch, optimized for manual assembly and prototyping. Thermal resistance Rth(j-a) is 250 K/W in free air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Input node connected internally to R1 (4.7 kΩ) and R2 (47 kΩ); accepts TTL/CMOS logic-level signals directly. |
| 2 | Collector | High-side switching node; connects to load supply rail (up to 50 V) and drives external loads. |
| 3 | Emitter | Common return path tied to ground; provides low-impedance sink for load current up to 100 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias network | Eliminates need for two external resistors, reducing BOM count and layout area by ≥2 components per switch node. |
| Guaranteed Vi(on)/Vi(off) | Vi(on) ≥ 0.9 V and Vi(off) ≤ 0.6 V ensure compatibility with 3.3 V and 5 V logic families without level-shifting. |
| Low VCE(sat) | ≤100 mV at rated current reduces conduction loss to <1 mW at 10 mA, supporting thermally constrained designs. |
| TO-92 mechanical compatibility | Standard SOT54 footprint allows drop-in replacement of discrete BJT + resistor combinations in legacy through-hole assemblies. |
| 150 °C junction rating | Enables operation in extended-temperature environments such as automotive cabin modules and industrial enclosures. |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V microcontroller outputs. IC Role / Device Role / Timing Role: Digital switch translating MCU logic state into LED current path. Use Value: Eliminates external base resistor; ensures full saturation at 3.3 V drive while maintaining <100 mV drop across PDTC143ZS. |
Use Scenario: Adding 8-bit parallel output capability to an MCU with limited GPIO pins. IC Role / Device Role / Timing Role: Level-translating buffer stage between MCU port and higher-voltage peripheral bus. Use Value: Enables direct connection to 5 V peripherals using 3.3 V logic; R2 feedback prevents floating base during reset. |
| Logic-Level Inverter | Relay Coil Driver |
|
Use Scenario: Converting active-high sensor output to active-low signal for interrupt input. IC Role / Device Role / Timing Role: Single-stage inverting switch with defined threshold and fast edge response. Use Value: Vi(off) ≤ 0.6 V guarantees clean turn-off even with weak pull-down sources; propagation delay <100 ns typical. |
Use Scenario: Switching 12 V, 40 mA relay coils in HVAC control panels. IC Role / Device Role / Timing Role: Low-side power switch handling inductive load current and flyback energy. Use Value: 50 V VCEO margin accommodates 12 V coil + 30 V flyback spikes; 100 mA rating covers peak relay surge. |
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 |
|---|---|---|---|
| MMBT3904R | Discrete NPN BJT without built-in resistors; requires external R1/R2 network. | Higher component count and layout area; suitable where bias tuning or variable gain is needed. | Select when precise base current adjustment or multi-stage gain control is required beyond fixed-ratio switching. |
| PDTC124E,115 | R1 = 22 kΩ, R2 = 47 kΩ; higher input impedance and lower base current draw. | Better suited for high-impedance drivers (e.g., op-amp outputs) but slower turn-on due to reduced IB. | Choose for battery-powered systems needing lower quiescent input current, accepting ~2× longer ton. |
Compared with MMBT3904R and PDTC124E,115, the PDTC143ZS offers optimal balance of input sensitivity (Vi(on) ≤ 0.9 V), low saturation loss (≤100 mV), and mechanical compatibility with TO-92 sockets - making it ideal for cost-sensitive, space-constrained digital interface designs.
Availability
PDTC143ZS is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, logic-level inversion, and relay coil driving requiring stable component supply and long-term obsolescence management.
Supply support for PDTC143ZS 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PDTC143ZS belongs to NXP's resistor-equipped transistor family, designed specifically to simplify digital switching in cost-sensitive, high-volume consumer and industrial control products.
FAQ
What is the maximum continuous collector current for PDTC143ZS?
The PDTC143ZS supports a maximum DC output current (IO) of 100 mA, verified under Tamb ≤25 °C with adequate PCB copper area. At elevated ambient temperatures or with limited thermal relief, derating applies per the 500 mW total power dissipation limit. This rating makes PDTC143ZS suitable for driving LEDs, small solenoids, and logic buffers without external heatsinking.
Does PDTC143ZS require external base resistors?
No - PDTC143ZS integrates R1 = 4.7 kΩ and R2 = 47 kΩ internally, eliminating the need for external bias resistors. This simplifies circuit design, reduces component count, and improves manufacturing yield. The fixed resistor ratio ensures predictable turn-on behavior with standard 3.3 V or 5 V logic drivers, and the internal R2 provides reliable turn-off even with high-impedance source nodes.
What package type does PDTC143ZS use, and is it through-hole or surface-mount?
PDTC143ZS uses the SOT54 package, also known as TO-92 - a plastic single-ended leaded through-hole package with three leads spaced at 2.54 mm pitch. It is not a surface-mount device; it is intended for insertion into plated-through holes and wave or hand soldering. The SOT54 outline is widely supported in prototyping breadboards and legacy production lines.
Can PDTC143ZS replace a standard 2N3904 transistor in existing designs?
PDTC143ZS is not a direct functional replacement for 2N3904 because it includes integrated bias resistors and has different pinout (base-collector-emitter vs. emitter-base-collector). While both are NPN transistors, substituting PDTC143ZS requires verifying that the application relies on fixed-ratio switching - not adjustable gain or analog amplification - and updating the PCB layout to match the SOT54 pin assignment.
What is the guaranteed VCE(sat) for PDTC143ZS under typical operating conditions?
The PDTC143ZS guarantees VCE(sat) ≤ 100 mV when IC = 5 mA and IB = 0.25 mA at Tamb = 25 °C. This low saturation voltage ensures minimal power loss (<0.5 mW) and negligible self-heating during steady-state switching, supporting reliable operation in thermally restricted enclosures and battery-powered devices where efficiency matters.
PDTC143ZS,126 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Pre-Biased
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 4.7 kOhms
- Resistor - Emitter Base (R2):
- 47 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 100mV @ 250µA, 5mA
- Current - Collector Cutoff (Max):
- 1µA
- Frequency - Transition:
- -
- Power - Max:
- 500 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
PDTC143ZS,126 FAQ
1.How can I place an order for PDTC143ZS,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC143ZS,126 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 PDTC143ZS,126 reliable?
The price and inventory of PDTC143ZS,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC143ZS,126 is usually 5 days.
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Once your PDTC143ZS,126 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 PDTC143ZS,126?
For technical support, including PDTC143ZS,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC143ZS,126 requirements.
6.How does Aetrix verify that PDTC143ZS,126 is sourced from the original manufacturer or authorized distributors?
All PDTC143ZS,126 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 PDTC143ZS,126 meets industry standards.
7.What is the process for return or replacement of PDTC143ZS,126?
All PDTC143ZS,126 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC143ZS,126, 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 PDTC143ZS,126 part is unused and in its original packaging.
Return procedure for PDTC143ZS,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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