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NXP Semiconductors PDTC124TK,115
- Part No.:
- PDTC124TK,115
- Manufacturer:
- NXP Semiconductors
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PDTC124TK,115.pdf
- Description:
- TRANS PREBIAS NPN 50V 0.1A SMT3
- Quantity:
- Payment:
- Shipping:
Inventory:8,509
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Product details
Overview
PDTC124TK from NXP Semiconductors (formerly Philips) is an NPN resistor-equipped transistor with integrated 22 kΩ base bias resistor (R1), open R2, 50 V VCEO, 100 mA IO, and SOT346 (SC-59) package - used for compact DC switching in interface and driver circuits.
For engineers reviewing the PDTC124TK datasheet, PDTC124TK pinout, PDTC124TK application, or PDTC124TK equivalent, key selection criteria include verified R1 tolerance (15.4–28.6 kΩ), confirmed 3-pin SOT346 pinning (base-collector-emitter), thermal resistance (500 K/W), and compatibility with reflow-only assembly per JEDEC J-STD-020.
Technical Context
This device integrates a single 22 kΩ pull-up resistor between base and input terminal, eliminating external bias components. It operates as a digital switch with guaranteed hFE ≥100 at IC = 1 mA and VCE = 5 V, and exhibits low VCE(sat) ≤150 mV at IC = 10 mA / IB = 0.5 mA.
Designed for surface-mount use only, PDTC124TK requires reflow soldering per J-STD-020; its SOT346 package delivers 250 mW power dissipation at Tamb ≤25 °C and junction temperature up to 150 °C, with thermal resistance of 500 K/W in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - supports switching loads up to 50 V without breakdown |
| IO (DC) | 100 mA - enables direct drive of LEDs, small relays, or logic inputs |
| R1 | 22 kΩ (15.4–28.6 kΩ) - sets base current for predictable saturation with minimal external parts |
| VCE(sat) | ≤150 mV at IC=10 mA/IB=0.5 mA - ensures low conduction loss in on-state |
| hFE | ≥100 at VCE=5 V, IC=1 mA - guarantees reliable turn-on under defined bias conditions |
| Ptot | 250 mW at Tamb ≤25 °C - defines maximum continuous power handling in SOT346 package |
| Rth(j-a) | 500 K/W - determines junction-to-ambient temperature rise under steady-state operation |
Pinout & Package
SOT346 (SC-59) is a plastic surface-mounted package with 3 leads, 1.7 mm × 1.3 mm body size, and standard gull-wing lead form. Thermal performance is rated at 500 K/W in free air; reflow soldering is mandatory.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Input node connected internally to R1; accepts TTL/CMOS-level control signals |
| 2 | Collector | Switched high-side output node; connects to load supply rail |
| 3 | Emitter | Common emitter reference; ties directly to ground or low-side return path |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 bias resistor | Reduces BOM count by eliminating discrete base resistor; 22 kΩ value optimized for 3.3–5 V logic drive |
| No R2 connection | Eliminates need for base-emitter shunt resistor - simplifies design for unidirectional switching |
| SOT346 package | Enables high-density PCB layout with 1.7 × 1.3 mm footprint and gull-wing leads compatible with standard SMT processes |
| Reflow-only assembly | Ensures mechanical reliability and interconnect integrity; excludes wave or hand-soldering |
| 150 °C max junction temperature | Supports operation in industrial ambient environments up to +85 °C with appropriate derating |
Applications
| LED Driver Circuit | Microcontroller GPIO Interface |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU outputs. IC Role / Device Role / Timing Role: NPN switch amplifying logic-level signals to sink LED current. Use Value: Eliminates external base resistor; VCE(sat) ≤150 mV ensures >3.1 V forward voltage margin for red/green LEDs. | Use Scenario: Level-shifting and current boosting between 3.3 V microcontrollers and 5 V peripheral logic. IC Role / Device Role / Timing Role: Digital buffer providing gain and isolation between voltage domains. Use Value: hFE ≥100 ensures full saturation with 0.5 mA base drive; SOT346 footprint fits tight MCU peripheral layouts. |
| Logic Inverter Stage | Small-Signal Relay Driver |
Use Scenario: Implementing active-low logic inversion in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Single-transistor inverter with built-in bias network. Use Value: R1 tolerance (±30%) maintains consistent switching threshold across production; 100 mA IO supports 10–15 mA load currents. | Use Scenario: Driving 5 V, 40 mA coil relays from low-power MCU I/O pins. IC Role / Device Role / Timing Role: High-gain saturated switch delivering full coil current with minimal base drive. Use Value: Confirmed 100 mA IO rating and 250 mW Ptot support continuous relay actuation without thermal shutdown. |
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 |
|---|---|---|---|
| PDTC124ET,115 | SOT416 (SC-75) package; smaller 0.95 × 0.75 mm footprint; lower Ptot (150 mW); higher Rth(j-a) (833 K/W) | Preferred for ultra-compact designs where thermal load is light and board space is critical | Select PDTC124ET,115 only when PCB area is constrained and average power <100 mW |
| PDTC124TT,115 | SOT23 package; identical electrical specs but different pinout (1=base, 2=emitter, 3=collector); same Ptot (250 mW) | Requires PCB layout revision due to reversed emitter/collector pin assignment | Choose PDTC124TT,115 only if SOT23 footprint is already standardized in the design |
Compared with PDTC124TK, PDTC124ET,115 offers smaller size but reduced thermal capability, while PDTC124TT,115 matches power rating but demands pinout-aware layout changes - neither is pin-compatible, and both require validation against target thermal and routing constraints.
Availability
PDTC124TK is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface stages, and logic inverter applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for PDTC124TK 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, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs, RF power transistors, and automotive-grade discrete semiconductors.
The PDTC124T series was developed to simplify digital switching designs by integrating precision bias resistors into compact SMD transistor packages - targeting cost-sensitive, space-constrained consumer and industrial control systems.
FAQ
What is the exact pin configuration of PDTC124TK?
PDTC124TK uses SOT346 (SC-59) packaging with confirmed pinout: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter. This arrangement is explicitly documented in the "Simplified outline, symbol and pinning" section of the official datasheet and differs from SOT23 variants like PDTC124TT, which swaps emitter and collector positions.
Does PDTC124TK include both R1 and R2 bias resistors?
No. PDTC124TK integrates only R1 = 22 kΩ between base and input; R2 is explicitly specified as "open" in the datasheet. This configuration supports unidirectional switching applications where base-emitter shunting is unnecessary, distinguishing it from dual-resistor RETs like PDTC143ZK.
What is the maximum allowable continuous collector current for PDTC124TK?
The absolute maximum DC output current (IO) for PDTC124TK is 100 mA, as stated in the Quick Reference Data table. This rating applies under standard mounting conditions at Tamb ≤25 °C; derating is required above that ambient temperature per the thermal resistance specification (Rth(j-a) = 500 K/W).
Can PDTC124TK be used in through-hole prototypes?
No. PDTC124TK is exclusively a surface-mount device in SOT346 package and lacks leads suitable for through-hole mounting. For prototyping, use the through-hole variant PDTC124TS in SOT54 (TO-92) package, which shares identical electrical specifications but different mechanical form factor.
Is reflow soldering mandatory for PDTC124TK?
Yes. The datasheet explicitly states "Reflow soldering is the only recommended soldering method" for PDTC124TK. Wave soldering or hand-soldering is not qualified and may compromise reliability due to thermal stress on the SOT346 package and internal resistor structure.
PDTC124TK,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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:
- 250 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMT3; MPAK
PDTC124TK,115 FAQ
1.How can I place an order for PDTC124TK,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC124TK,115 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 PDTC124TK,115 reliable?
The price and inventory of PDTC124TK,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC124TK,115 is usually 5 days.
3.What payment methods are accepted for PDTC124TK,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC124TK,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDTC124TK,115?
PDTC124TK,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDTC124TK,115 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 PDTC124TK,115?
For technical support, including PDTC124TK,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC124TK,115 requirements.
6.How does Aetrix verify that PDTC124TK,115 is sourced from the original manufacturer or authorized distributors?
All PDTC124TK,115 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 PDTC124TK,115 meets industry standards.
7.What is the process for return or replacement of PDTC124TK,115?
All PDTC124TK,115 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC124TK,115, 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 PDTC124TK,115 part is unused and in its original packaging.
Return procedure for PDTC124TK,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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