My Inquiry
My Account
NXP Semiconductors PDTC124TS,126
,TO-226_straightlead.jpg)
- Part No.:
- PDTC124TS,126
- Manufacturer:
- NXP Semiconductors
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
PDTC124TS,126.pdf
- Description:
- TRANS PREBIAS NPN 50V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,131
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PDTC124TS,126 from NXP Semiconductors (formerly Philips) is an NPN resistor-equipped transistor with integrated 22 kΩ base bias resistor (R1), open R2 configuration, 50 V VCEO, 100 mA IO, and TO-92 (SOT54) through-hole package - used for low-power switching in interface and inverter circuits.
For engineers reviewing the PDTC124TS,126 datasheet, PDTC124TS,126 pinout, PDTC124TS,126 application, or PDTC124TS,126 equivalent, key selection criteria include its fixed 22 kΩ input resistor, 500 mW power dissipation at Tamb ≤25 °C, and verified SOT54 leadframe thermal resistance of 250 K/W - critical for discrete logic-level drive and signal conditioning designs.
Technical Context
This device integrates a single 22 kΩ pull-up resistor between base and input terminal, with R2 left unconnected - enabling simplified NPN switch operation without external bias components. It operates as a digital on/off switch rather than a linear amplifier, with guaranteed hFE ≥100 at IC = 1 mA and VCE = 5 V.
Voltage ratings are symmetrical: VCBO = VCEO = 50 V, while VEBO = 5 V limits reverse emitter-base stress. Saturation voltage is specified at 150 mV max under IC = 10 mA / IB = 0.5 mA conditions - confirming suitability for low-loss switching in 3.3 V and 5 V logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V maximum - supports rail-to-rail switching in 24 V industrial control inputs and 5 V microcontroller I/O buffers. |
| IO (DC) | 100 mA maximum - sufficient to drive LEDs, small relays, or MOSFET gates directly from MCU GPIOs. |
| R1 | 22 kΩ ±30% (15.4–28.6 kΩ) - sets base current for predictable turn-on without external resistor calculation. |
| Ptot | 500 mW at Tamb ≤25 °C - enables continuous operation in ambient-ventilated through-hole PCB layouts. |
| VCE(sat) | ≤150 mV at IC = 10 mA / IB = 0.5 mA - minimizes conduction loss and self-heating in high-duty-cycle switching. |
| hFE | ≥100 at VCE = 5 V, IC = 1 mA - ensures robust saturation margin across temperature and process variation. |
| Rth(j-a) | 250 K/W - defines thermal rise of 125 °C at full 500 mW dissipation, guiding heatsinking decisions for sustained loads. |
Pinout & Package
PDTC124TS,126 uses the plastic single-ended leaded (through-hole) SOT54 (TO-92) package with 3 leads and standard 2.54 mm lead pitch. The body measures 4.8 × 4.2 × 14.5 mm (D × E × L), with lead length ≥12.7 mm and plating thickness included per JEDEC TO-92 spec.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Input node connected internally to 22 kΩ resistor; accepts TTL/CMOS logic-level signals directly. |
| 2 | Collector | Switched high-side output node; connects to load supply rail (e.g., +5 V, +12 V, or +24 V). |
| 3 | Emitter | Common return path tied to system ground; provides reference for load current return. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 22 kΩ base resistor | Eliminates need for external bias network - reduces BOM count by one resistor and saves 2.5 mm² PCB area per instance. |
| Open R2 configuration | Prevents unintended base-emitter shunting - preserves full hFE and avoids leakage-induced false triggering. |
| 500 mW power rating in SOT54 | Supports continuous 100 mA switching at ambient temperatures up to 75 °C without forced airflow. |
| 150 mV VCE(sat) at rated current | Reduces power loss to ≤15 mW during conduction - critical for thermally constrained enclosures and battery-powered systems. |
| TO-92 mechanical compatibility | Enables drop-in replacement for legacy discrete NPN transistors (e.g., BC547, 2N3904) in existing through-hole designs. |
Applications
| Industrial Sensor Interface | Microcontroller GPIO Driver |
|---|---|
|
Use Scenario: Converting analog sensor output (e.g., 4–20 mA loop receiver) into clean digital logic levels for PLC input modules. IC Role / Device Role / Timing Role: Level-shifting and current-to-voltage conversion switch with hysteresis-free on/off behavior. Use Value: Eliminates need for op-amp comparator and external bias resistors - reduces component count by ≥3 parts per channel. |
Use Scenario: Driving optocoupler LED inputs from 3.3 V ARM Cortex-M GPIO pins with current limiting. IC Role / Device Role / Timing Role: Digital buffer and current amplifier ensuring reliable LED forward current ≥10 mA. Use Value: Guarantees 150 mV saturation voltage at 10 mA load - maintains >3.15 V headroom for LED forward voltage tolerance. |
| Relay Coil Driver | LED Indicator Control |
|
Use Scenario: Switching 12 V DC relay coils (≈40 mA hold current) in HVAC control panels using MCU outputs. IC Role / Device Role / Timing Role: Low-side switch providing galvanic isolation between logic and inductive load. Use Value: Withstands 50 V VCEO and handles 100 mA peak coil inrush - prevents breakdown during relay de-energization flyback. |
Use Scenario: Controlling status LEDs on embedded instrumentation front panels powered from 5 V rails. IC Role / Device Role / Timing Role: Constant-current sink delivering stable 15–20 mA to red/green/yellow LEDs. Use Value: Fixed 22 kΩ R1 ensures consistent brightness across batches - no manual resistor selection or calibration required. |
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 |
|---|---|---|---|
| PDTC124TK,115 | SOT346 (SC-59) surface-mount package; same R1 = 22 kΩ, but Ptot = 250 mW and Rth(j-a) = 500 K/W. | Requires rework of PCB layout for SMT assembly; unsuitable for through-hole prototyping or repair. | Select when board space is constrained and automated assembly is used - not for hand-soldered or legacy TO-92 footprints. |
| MMBT3904LT1G | Standard NPN BJT (no built-in resistors); requires external 10–47 kΩ base resistor; VCEO = 40 V, IC = 200 mA. | Offers higher current capability but adds design complexity and BOM item - no internal R1 simplification. | Choose when higher collector current or tighter VCE(sat) (<100 mV) is needed, and external bias design is acceptable. |
Compared with PDTC124TK,115, PDTC124TS,126 delivers 2× higher power dissipation and lower thermal resistance in a serviceable through-hole form factor; versus MMBT3904LT1G, it trades external component flexibility for guaranteed biasing and reduced layout risk in cost-sensitive consumer and industrial controls.
Availability
PDTC124TS,126 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller GPIO drivers, relay coil switching, and LED indicator control requiring stable component supply and long-term obsolescence management.
Supply support for PDTC124TS,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 formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The PDTC124TS,126 belongs to NXP's legacy resistor-equipped transistor family, designed specifically to reduce component count and simplify discrete logic-level switching in cost-sensitive, high-volume industrial and consumer electronics.
FAQ
What is the exact package type and lead configuration of PDTC124TS,126?
PDTC124TS,126 uses the SOT54 (TO-92) plastic single-ended leaded through-hole package with three leads arranged in straight-line configuration. Pin 1 is base, Pin 2 is collector, and Pin 3 is emitter - matching standard TO-92 mechanical dimensions and soldering requirements per JEDEC outline.
Does PDTC124TS,126 have a second internal resistor (R2), and what is its value?
No - PDTC124TS,126 has R2 explicitly defined as "open" in the datasheet. Only R1 = 22 kΩ is integrated between base and input terminal. This configuration avoids unintended base-emitter shunting and preserves full current gain for reliable switching performance.
Can PDTC124TS,126 replace a standard 2N3904 in existing designs?
PDTC124TS,126 can functionally replace 2N3904 in switching applications where the base is driven by a logic-level signal, but only if the external base resistor is removed. Its integrated 22 kΩ R1 eliminates the need for that resistor - so direct substitution requires schematic modification to avoid double-biasing.
What is the maximum junction temperature and storage temperature range for PDTC124TS,126?
The absolute maximum junction temperature (Tj) for PDTC124TS,126 is 150 °C, and the storage temperature range (Tstg) is −65 °C to +150 °C. These ratings align with industrial-grade reliability requirements and permit operation in uncontrolled ambient environments such as factory floors or outdoor enclosures.
Is PDTC124TS,126 RoHS compliant and halogen-free?
Yes - PDTC124TS,126 complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The device was manufactured in Malaysia ('t' marking code) under NXP's qualified environmental compliance program, with full material declarations available upon request.
PDTC124TS,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):
- 22 kOhms
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1mA, 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
PDTC124TS,126 FAQ
1.How can I place an order for PDTC124TS,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC124TS,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 PDTC124TS,126 reliable?
The price and inventory of PDTC124TS,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC124TS,126 is usually 5 days.
3.What payment methods are accepted for PDTC124TS,126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC124TS,126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDTC124TS,126?
PDTC124TS,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDTC124TS,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 PDTC124TS,126?
For technical support, including PDTC124TS,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC124TS,126 requirements.
6.How does Aetrix verify that PDTC124TS,126 is sourced from the original manufacturer or authorized distributors?
All PDTC124TS,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 PDTC124TS,126 meets industry standards.
7.What is the process for return or replacement of PDTC124TS,126?
All PDTC124TS,126 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC124TS,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 PDTC124TS,126 part is unused and in its original packaging.
Return procedure for PDTC124TS,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDTC124TS,126 Tags
-
MUN5211T1G
onsemi
-
DTC043ZEBTL
Rohm Semiconductor
-
DTC114EKAT146
Rohm Semiconductor
-
DDTD113ZC-7-F
Diodes Incorporated
-
DRDNB16W-7
Diodes Incorporated
-
PDTC114ET,215
Nexperia USA Inc.
-
PDTC143ZT,215
Nexperia USA Inc.
-
PDTC143ET,215
Nexperia USA Inc.
-
PDTC143XT,215
Nexperia USA Inc.
-
MMUN2211LT1G
onsemi
-
PDTC144ET,215
Nexperia USA Inc.
-
PDTC124ET,215
Nexperia USA Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
