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NXP Semiconductors PDTC123ES,126
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- Part No.:
- PDTC123ES,126
- Manufacturer:
- NXP Semiconductors
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
PDTC123ES,126.pdf
- Description:
- TRANS PREBIAS NPN 50V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,001
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Product details
Overview
PDTC123ES,126 from NXP Semiconductors is an NPN resistor-equipped transistor in TO-92 (SOT54) through-hole package with integrated 2.2 kΩ base bias resistors R1 and R2, rated for 50 V VCEO, 100 mA IO, and 500 mW Ptot, used for low-power switching in digital logic interfaces and microcontroller I/O drivers.
For engineers reviewing the PDTC123ES,126 datasheet, PDTC123ES,126 pinout, PDTC123ES,126 application, or PDTC123ES,126 equivalent, key selection criteria include its built-in bias network eliminating external resistors, TO-92 mechanical compatibility with legacy through-hole designs, DC current gain hFE ≥ 30 at 20 mA, and thermal resistance Rth(j-a) = 250 K/W in free air.
Technical Context
The PDTC123ES,126 integrates two precision 2.2 kΩ resistors (R1 between base and input, R2 between base and emitter) to configure a fixed-current bias network, enabling direct connection to CMOS/TTL logic outputs without external components. Its internal resistor ratio (R1/R2 = 1.0 ± 0.2) ensures stable saturation behavior across temperature.
As a monolithic NPN transistor with embedded biasing, it operates as a single-stage digital switch-accepting logic-level inputs (VI(on) = 1.6 V typ., VI(off) = 1.2 V typ.) and delivering up to 100 mA collector output while maintaining VCE(sat) ≤ 150 mV at IC = 10 mA/IB = 0.5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V maximum - supports interface with 5 V, 3.3 V, and 12 V logic systems without external voltage limiting |
| IO (DC) | 100 mA maximum - drives LEDs, small relays, and MOSFET gates directly from MCU GPIOs |
| R1 / R2 | 2.2 kΩ ±30% - eliminates need for two external bias resistors, reducing BOM count and PCB area |
| hFE | ≥30 at VCE = 5 V, IC = 20 mA - ensures reliable saturation with standard logic-level drive currents |
| VCE(sat) | ≤150 mV at IC = 10 mA, IB = 0.5 mA - minimizes power loss and self-heating in switching applications |
| Ptot | 500 mW at Tamb ≤ 25 °C - enables continuous operation in ambient temperatures up to +70 °C with minimal heatsinking |
Pinout & Package
PDTC123ES,126 uses the SOT54 (TO-92) plastic single-ended leaded through-hole package with 3 leads, standardized mechanical dimensions (D = 4.8 mm, E = 4.2 mm, L = 14.5 mm), and JEDEC TO-92 outline compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Input node connected internally to R1 (2.2 kΩ) and R2 (2.2 kΩ); accepts logic-level signals directly |
| 2 | Collector | Output node sourcing load current; electrically isolated from base by R1/R2 network |
| 3 | Emitter | Common reference terminal tied to system ground; forms return path for collector current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias resistors | Eliminates two external 2.2 kΩ resistors, reducing component count and assembly cost |
| Logic-compatible input threshold | VI(on) = 1.6 V typical enables direct drive from 3.3 V and 5 V CMOS/TTL outputs |
| Low saturation voltage | VCE(sat) ≤ 150 mV ensures <15 mW power dissipation at 100 mA switching, minimizing thermal stress |
| Through-hole TO-92 footprint | Enables drop-in replacement in legacy designs using SOT54-compatible sockets or hand-soldered assemblies |
Applications
| LED Indicator Driver | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving 20 mA status LEDs from 3.3 V microcontroller pins in industrial control panels. IC Role / Device Role / Timing Role: Digital switch translating logic-high GPIO output into LED current path via collector-emitter conduction. Use Value: Built-in R1/R2 allows direct connection without external biasing, reducing layout complexity and enabling compact 3-pin TO-92 placement near indicator locations. | Use Scenario: Extending limited GPIO count on an ARM Cortex-M0 MCU to drive multiple solenoid valves in HVAC actuators. IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between low-drive MCU pins and 12 V/50 mA valve coils. Use Value: 100 mA IO rating and 50 V VCEO support direct coil driving, while VCE(sat) ≤ 150 mV limits heat generation during continuous duty cycles. |
| Digital Logic Inverter | RS-232 Line Receiver Interface |
Use Scenario: Implementing active-low signal inversion in battery-powered sensor nodes using discrete logic. IC Role / Device Role / Timing Role: Single-transistor inverter stage where base input toggles collector output between high-Z and grounded states. Use Value: Fixed R1/R2 ratio ensures consistent switching thresholds across units, improving timing predictability versus discrete resistor-biased transistors. | Use Scenario: Converting RS-232 ±12 V line-receiver outputs to 0–3.3 V logic levels for UART input on an ESP32 module. IC Role / Device Role / Timing Role: Voltage-level translator clamping negative excursions with VEBO = 10 V and limiting positive swing via VI(on)/VI(off) thresholds. Use Value: 10 V VEBO withstands RS-232 negative swings, while logic-compatible input thresholds eliminate need for additional level-shifter ICs. |
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 |
|---|---|---|---|
| PDTC123EK,115 | SOT346 (SC-59) surface-mount package; same R1/R2 values and electrical specs but 250 mW Ptot | Requires rework of PCB for SMT assembly; unsuitable for through-hole prototyping or repair | Select when board space is constrained and automated SMT production is available |
| MMBT3904LT1G | Standard NPN BJT without bias resistors; requires two external 2.2 kΩ resistors; hFE min 100 vs. 30 for PDTC123ES,126 | Higher gain but increased component count and layout sensitivity to stray capacitance | Select when higher current gain or tighter VCE(sat) tolerance is required and external biasing is acceptable |
Compared with PDTC123ES,126, PDTC123EK,115 offers identical functionality in a smaller SMT package but reduces power handling by 50%, while MMBT3904LT1G delivers superior gain and saturation performance but increases design complexity and BOM cost due to mandatory external biasing.
Availability
PDTC123ES,126 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface modules, and digital logic inverter stages requiring stable component supply and long-term through-hole manufacturing support.
Supply support for PDTC123ES,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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PDTC123ES,126 belongs to NXP's resistor-equipped transistor (RET) product line, engineered to simplify digital interface design by integrating precision bias networks into standard bipolar transistor packages.
FAQ
What is the maximum continuous collector current rating for PDTC123ES,126?
The PDTC123ES,126 has a maximum DC output current (IO) rating of 100 mA, verified under standard mounting conditions at Tamb ≤ 25 °C. This rating applies to steady-state switching loads such as LEDs or small relays, and must be derated linearly above 25 °C ambient per the device's thermal resistance of 250 K/W.
Does PDTC123ES,126 require external base resistors for logic-level operation?
No, PDTC123ES,126 does not require external base resistors because it integrates R1 = 2.2 kΩ and R2 = 2.2 kΩ internally. These resistors configure a fixed-current bias network that enables direct connection to 3.3 V or 5 V logic outputs, eliminating two discrete components and associated layout constraints.
What is the collector-emitter saturation voltage of PDTC123ES,126 at 10 mA load current?
The PDTC123ES,126 exhibits a maximum VCE(sat) of 150 mV when operating at IC = 10 mA and IB = 0.5 mA, as specified in the "Characteristics" section of the official NXP datasheet. This low saturation voltage ensures minimal power loss and thermal rise during switching, supporting efficient operation in battery-powered devices.
Can PDTC123ES,126 be used as a direct replacement for a standard 2N3904 in through-hole designs?
PDTC123ES,126 is not a direct functional replacement for 2N3904 because it includes integrated base bias resistors, altering its input impedance and switching thresholds. While both use TO-92 packaging and share pinout (E-C-B), the PDTC123ES,126 requires no external resistors whereas 2N3904 does-making substitution viable only if the circuit design accounts for the built-in bias network.
What is the storage temperature range for PDTC123ES,126 according to its official datasheet?
According to the NXP PDTC123E series datasheet, the PDTC123ES,126 has a specified storage temperature range of −65 °C to +150 °C. This wide range supports reliability in harsh environments including automotive under-hood applications and industrial equipment subjected to thermal cycling.
PDTC123ES,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):
- 2.2 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 30 @ 20mA, 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
PDTC123ES,126 FAQ
1.How can I place an order for PDTC123ES,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC123ES,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 PDTC123ES,126 reliable?
The price and inventory of PDTC123ES,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC123ES,126 is usually 5 days.
3.What payment methods are accepted for PDTC123ES,126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC123ES,126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDTC123ES,126?
PDTC123ES,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDTC123ES,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 PDTC123ES,126?
For technical support, including PDTC123ES,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC123ES,126 requirements.
6.How does Aetrix verify that PDTC123ES,126 is sourced from the original manufacturer or authorized distributors?
All PDTC123ES,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 PDTC123ES,126 meets industry standards.
7.What is the process for return or replacement of PDTC123ES,126?
All PDTC123ES,126 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC123ES,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 PDTC123ES,126 part is unused and in its original packaging.
Return procedure for PDTC123ES,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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