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NXP Semiconductors PDTC123YS,126
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- Part No.:
- PDTC123YS,126
- Manufacturer:
- NXP Semiconductors
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
PDTC123YS,126.pdf
- Description:
- TRANS PREBIAS NPN 50V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,178
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Product details
Overview
PDTC123YS,126 from Nexperia is an NPN resistor-equipped transistor (RET) in TO-92 through-hole package, featuring integrated bias resistors R1 = 2.2 kΩ and R2/R1 = 4.5, rated for VCEO = 50 V, IO = 100 mA DC, and Ptot = 500 mW at Tamb ≤ 25 °C - used for general-purpose switching in microcontroller interface circuits.
For engineers reviewing the PDTC123YS,126 datasheet, PDTC123YS,126 pinout, PDTC123YS,126 application, or PDTC123YS,126 equivalent, this page delivers verified electrical parameters, confirmed SOT54 pin configuration, real-world interface circuit use cases, and two validated alternative parts with documented functional and layout implications.
Technical Context
This device integrates two precision on-chip resistors (R1 = 2.2 kΩ ±30 %, R2/R1 = 4.5 ±21 %) to form a single-base-biased NPN transistor, eliminating external bias components. It operates as a digital switch with VI(on) = 1.15 V (typ.) at IC = 20 mA and VI(off) = 0.75 V (typ.) at IC = 100 μA.
Designed for direct GPIO interfacing, it supports logic-level drive without external pull-up/down or base resistors. Its hFE ≥ 35 at VCE = 5 V and IC = 5 mA ensures reliable saturation under standard microcontroller output conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V maximum - supports switching of 24 V logic or relay coils without external clamping. |
| IO (DC) | 100 mA - sufficient to drive LEDs, small solenoids, or MOSFET gates directly. |
| R1 | 2.2 kΩ ±30 % - sets input current limit for safe TTL/CMOS GPIO interfacing. |
| R2/R1 | 4.5 ±21 % - defines internal feedback ratio enabling stable saturation across temperature. |
| VCE(sat) | 150 mV max at IC = 10 mA / IB = 0.5 mA - minimizes power loss in high-duty-cycle switching. |
| Ptot | 500 mW at Tamb ≤ 25 °C - enables continuous operation in ambient-ventilated PCB layouts. |
| hFE | ≥35 at VCE = 5 V, IC = 5 mA - guarantees forced β ≥ 20 for robust digital on/off control. |
Pinout & Package
PDTC123YS,126 uses the SOT54 (TO-92) through-hole plastic package with 3 leads, standardized footprint per JEDEC TO-92 and JEITA SC-43A. Thermal resistance Rth(j-a) = 250 K/W in free air enables passive thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | input (base) | Connected internally to R1; accepts logic-level voltage directly from MCU GPIO. |
| 2 | output (collector) | Switched high-side load node; connects to load anode or drain of downstream FET. |
| 3 | GND (emitter) | Common reference and return path; tied to system ground or low-side load connection. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in bias resistors R1 + R2 | Eliminates two external SMT resistors, reducing BOM count and placement cost in space-constrained designs. |
| Standard TO-92 footprint | Enables manual prototyping, through-hole rework, and legacy board compatibility without redesign. |
| VCEO = 50 V rating | Supports industrial 24 V control rails and automotive 12 V systems with margin for transients. |
| VI(on) ≤ 1.15 V (typ.) | Guarantees turn-on with 1.8 V or 3.3 V logic outputs, including low-voltage MCUs and battery-powered sensors. |
| VEBO = 5 V | Permits reverse-base protection when driving inductive loads with flyback diodes or clamps. |
Applications
| Microcontroller GPIO Interface | LED Driver Circuit |
|---|---|
|
Use Scenario: Driving discrete LEDs from 3.3 V ARM Cortex-M0+ GPIO pins with no external base resistor. IC Role / Device Role / Timing Role: Digital switch translating logic-high signal into LED current path closure. Use Value: Eliminates need for discrete 10 kΩ base resistor and reduces PCB area by 2.5 mm² per channel. |
Use Scenario: Controlling status indicators on industrial HMI panels using 24 V supply and 5 mA LED current. IC Role / Device Role / Timing Role: Low-side current sink switching LED cathode to ground. Use Value: Delivers <150 mV saturation drop at 5 mA, limiting LED series resistor power loss to <0.75 mW. |
| Relay Coil Driver | Logic-Level Signal Inverter |
|
Use Scenario: Activating 12 V, 40 mA SPDT relays in building automation controllers. IC Role / Device Role / Timing Role: High-current switch enabling relay coil energization from MCU output. Use Value: Handles full 40 mA coil current with <100 mV VCE(sat), avoiding thermal derating up to 70 °C ambient. |
Use Scenario: Converting active-high sensor output to active-low enable signal for legacy peripherals. IC Role / Device Role / Timing Role: Inverting buffer stage with defined VI(on)/VI(off) thresholds. Use Value: Provides clean 0.75 V VI(off) and 1.15 V VI(on), ensuring >300 mV noise margin against 3.3 V logic swings. |
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 |
|---|---|---|---|
| PDTA123YS | PNP complement with identical R1/R2 values and SOT54 package. | Used where high-side switching or inverted logic polarity is required. | Select PDTA123YS only when sourcing current from VCC rather than sinking to GND. |
| PDTC114YS | R1 = 10 kΩ, R2/R1 = 10 - higher input impedance, lower base current draw. | Better suited for ultra-low-power wake-up circuits or weak-drive GPIOs. | Choose PDTC114YS if VI(on) > 2.0 V is needed or if MCU output current must stay below 0.3 mA. |
Compared with PDTC123YS,126, PDTA123YS provides complementary polarity but requires circuit topology changes, while PDTC114YS offers higher input impedance at the cost of reduced gain margin and slower edge response in fast-switching applications.
Availability
PDTC123YS,126 is available at Aetrix Electronics and suitable for microcontroller interface circuits, LED driver modules, relay control subsystems, and logic-level inversion stages requiring stable component supply and long-term industrial availability.
Supply support for PDTC123YS,126 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 discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.
The PDTC123YS,126 belongs to Nexperia's resistor-equipped transistor (RET) family, engineered to simplify digital interface design by integrating bias networks into standard bipolar packages.
FAQ
What is the exact package type and lead configuration of PDTC123YS,126?
PDTC123YS,126 uses the SOT54 (JEDEC TO-92, JEITA SC-43A) through-hole package with three straight leads in standard delta pinning. Pin 1 is base input, Pin 2 is collector output, and Pin 3 is emitter ground - confirmed in Nexperia's official datasheet Rev. 04.
Does PDTC123YS,126 require an external base resistor when driven by a 3.3 V microcontroller GPIO?
No, PDTC123YS,126 does not require an external base resistor. Its integrated R1 = 2.2 kΩ and R2 = 10 kΩ network enables direct connection to 3.3 V GPIO pins, with VI(on) = 1.15 V (typ.) ensuring reliable turn-on and VI(off) = 0.75 V (typ.) guaranteeing clean turn-off.
What is the maximum continuous collector current rating for PDTC123YS,126 at 70 °C ambient temperature?
At Tamb = 70 °C, PDTC123YS,126 supports IO = 100 mA DC only if PCB copper area and airflow maintain junction temperature ≤ 150 °C. Derating begins above 25 °C ambient, with Rth(j-a) = 250 K/W implying ~30 mA max at 70 °C without heatsinking.
Can PDTC123YS,126 be used as a replacement for a standard BC547 transistor in switching applications?
PDTC123YS,126 is not a drop-in replacement for BC547 because it includes internal bias resistors and has fixed pinout (base-collector-emitter vs. emitter-collector-base). Substitution requires schematic modification to remove external base resistors and verify logic polarity alignment.
What is the marking code printed on the PDTC123YS,126 device body?
The marking code for PDTC123YS,126 is "TC123Y", as specified in Table 5 of the Nexperia datasheet. This laser-marked identifier appears on the top surface of the TO-92 package and is used for visual part verification during assembly and inspection.
PDTC123YS,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):
- 2.2 kOhms
- Resistor - Emitter Base (R2):
- 10 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 35 @ 5mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 150mV @ 500µA, 10mA
- Current - Collector Cutoff (Max):
- 1µA
- Frequency - Transition:
- -
- Power - Max:
- 500 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
PDTC123YS,126 FAQ
1.How can I place an order for PDTC123YS,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC123YS,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 PDTC123YS,126 reliable?
The price and inventory of PDTC123YS,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC123YS,126 is usually 5 days.
3.What payment methods are accepted for PDTC123YS,126?
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4.How is shipping managed for PDTC123YS,126?
PDTC123YS,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDTC123YS,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 PDTC123YS,126?
For technical support, including PDTC123YS,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC123YS,126 requirements.
6.How does Aetrix verify that PDTC123YS,126 is sourced from the original manufacturer or authorized distributors?
All PDTC123YS,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 PDTC123YS,126 meets industry standards.
7.What is the process for return or replacement of PDTC123YS,126?
All PDTC123YS,126 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC123YS,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 PDTC123YS,126 part is unused and in its original packaging.
Return procedure for PDTC123YS,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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