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Nexperia USA Inc. PDTC123TT,235
- Part No.:
- PDTC123TT,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PDTC123TT,235.pdf
- Description:
- TRANS PREBIAS NPN 50V TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,204
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Product details
Overview
PDTC123TT from Nexperia is an NPN resistor-equipped transistor (RET) in SOT23 package, designed for digital switching applications with integrated 2.2 kΩ base bias resistor (R1), 50 V VCEO, 100 mA output current capability, and emitter-grounded configuration. It replaces discrete BJT + resistor combinations in IC input control and low-power load switching circuits.
For engineers reviewing the PDTC123TT datasheet, PDTC123TT pinout, PDTC123TT application, or PDTC123TT equivalent, this device serves as a cost-optimized, space-saving alternative to BC847-based digital interface designs requiring guaranteed turn-on behavior and reduced component count.
Technical Context
This RET integrates a single 2.2 kΩ base-input resistor (R1) with no internal emitter-base resistor (R2 = open), forming a two-terminal bias network that simplifies drive requirements for microcontroller GPIOs and logic outputs. Its fixed bias topology eliminates external resistor selection and layout dependency.
The device operates as a saturated switch with VCE(sat) ≤ 150 mV at IC = 10 mA / IB = 0.5 mA, and exhibits DC current gain (hFE) ≥ 30 at VCE = 5 V and IC = 20 mA - enabling predictable on-state performance without current-sense feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum allowable collector-emitter voltage before breakdown; supports 24 V industrial logic and sensor interface rails. |
| IO | 100 mA - Continuous output current rating; sufficient for driving LEDs, small relays, and logic-level inputs. |
| R1 | 2.2 kΩ (1.54–2.86 kΩ) - Integrated base bias resistor enables direct connection to 3.3 V/5 V logic without external components. |
| VCE(sat) | ≤ 150 mV at IC = 10 mA, IB = 0.5 mA - Ensures low conduction loss and minimal self-heating in switching mode. |
| hFE | ≥ 30 at VCE = 5 V, IC = 20 mA - Guarantees reliable saturation under standard digital drive conditions. |
| Ptot | 250 mW at Tamb ≤ 25 °C - Thermal limit compatible with standard SOT23 PCB footprints on FR4. |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact 3.0 × 1.4 × 1.1 mm body, standard footprint for high-density PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | input (base) | Connected internally to R1; accepts logic-level drive directly from MCU or gate output. |
| 2 | GND (emitter) | Common reference node; tied to system ground - defines low-side switching topology. |
| 3 | output (collector) | Switched output node; connects to load (e.g., LED anode, relay coil) referenced to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 bias resistor | 2.2 kΩ tolerance ±29%; eliminates external resistor placement and solder joint risk in automated assembly. |
| Emitter-grounded configuration | Fixed terminal assignment (Pin 2 = emitter) enables consistent low-side switch implementation across designs. |
| 100 mA continuous output | Supports direct drive of common indicator loads without heatsinking or current amplification stages. |
| SOT23 package compatibility | Matches industry-standard pick-and-place tooling and reflow profiles; compatible with BC847 footprint. |
Applications
| LED Indicator Control | Microcontroller GPIO Interface |
|---|---|
|
Use Scenario: Driving status LEDs from 3.3 V or 5 V MCU pins with current limiting. IC Role / Device Role / Timing Role: Low-side switch controlled by GPIO output; provides defined on/off state without external biasing. Use Value: Eliminates need for discrete base resistor, reducing BOM count and PCB area while ensuring consistent LED brightness. |
Use Scenario: Level-shifting and signal conditioning between mixed-voltage logic domains. IC Role / Device Role / Timing Role: Digital buffer isolating sensitive controller outputs from higher-voltage peripherals. Use Value: Prevents back-driving and latch-up risk via inherent current limiting and saturation control. |
| Small Relay Driver | Logic Input Conditioning |
|
Use Scenario: Switching 5–24 V DC relay coils in industrial I/O modules. IC Role / Device Role / Timing Role: Power switch interfacing microcontroller to inductive load; requires flyback diode protection. Use Value: Delivers 100 mA with <150 mV saturation drop, minimizing power dissipation and coil energization delay. |
Use Scenario: Cleaning noisy or floating inputs to FPGA or ASIC configuration pins. IC Role / Device Role / Timing Role: Active pull-down switch ensuring defined logic-low state during power-up or reset. Use Value: Replaces passive RC networks with deterministic turn-on timing and immunity to leakage currents. |
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 |
|---|---|---|---|
| BC847B,115 | Discrete NPN BJT with no built-in resistors; requires external 2.2 kΩ base resistor. | Higher design flexibility but increases component count and layout complexity. | Select when adjustable bias or multi-stage gain is required beyond simple switching. |
| PDTA123TT,235 | PNP complement with identical R1 = 2.2 kΩ, same SOT23 package and pinout (mirror polarity). | Used for high-side switching where load connects to ground and source connects to VCC. | Select for complementary low-side/high-side pair design or inverted logic interface needs. |
Compared with BC847B and PDTA123TT, PDTC123TT offers plug-and-play digital switching with fixed bias, reducing validation effort for GPIO-driven loads while maintaining pin-compatible replacement for legacy BC847 layouts.
Availability
PDTC123TT is available at Aetrix Electronics and suitable for LED indicator control, microcontroller GPIO interfacing, and small relay driver applications requiring stable component supply and long-term production continuity.
Supply support for PDTC123TT 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 semiconductor expert focused on high-volume, high-reliability essential semiconductors for automotive, industrial, and consumer markets.
PDTC123TT belongs to the NPN Resistor-Equipped Transistor (RET) product line, engineered to replace discrete BJT-resistor combinations in digital interface and switching applications with zero-compromise manufacturability.
FAQ
What is the function of the internal resistor in PDTC123TT?
The PDTC123TT integrates a single 2.2 kΩ resistor (R1) between Pin 1 (base) and the internal transistor base. This resistor enables direct connection to logic outputs without external bias components, ensuring predictable turn-on behavior and eliminating resistor placement errors in high-speed assembly.
Can PDTC123TT be used in linear amplifier configurations?
No - PDTC123TT is optimized for saturated switching operation only. Its fixed R1 bias and lack of R2 prevent stable DC biasing for analog amplification. The datasheet specifies parameters like hFE and VCE(sat) exclusively under switching conditions, not linear region operation.
Is PDTC123TT pin-compatible with BC847 transistors?
Yes - PDTC123TT uses the standard SOT23 (TO-236AB) package with identical mechanical footprint and terminal mapping (Pin 1 = base, Pin 2 = emitter, Pin 3 = collector). However, electrical behavior differs due to the integrated R1, so schematic symbol and netlist must reflect the RET structure.
What is the maximum ambient temperature for continuous operation?
PDTC123TT supports continuous operation up to +150 °C ambient temperature per its storage and junction temperature ratings. At elevated temperatures, derating applies: total power dissipation drops from 250 mW at 25 °C to ~125 mW at 100 °C based on thermal resistance (Rth(j-a) = 500 K/W).
PDTC123TT,235 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- -
- 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:
- 250 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
PDTC123TT,235 FAQ
1.How can I place an order for PDTC123TT,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC123TT,235 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 PDTC123TT,235 reliable?
The price and inventory of PDTC123TT,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC123TT,235 is usually 5 days.
3.What payment methods are accepted for PDTC123TT,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC123TT,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDTC123TT,235?
PDTC123TT,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDTC123TT,235 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 PDTC123TT,235?
For technical support, including PDTC123TT,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC123TT,235 requirements.
6.How does Aetrix verify that PDTC123TT,235 is sourced from the original manufacturer or authorized distributors?
All PDTC123TT,235 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 PDTC123TT,235 meets industry standards.
7.What is the process for return or replacement of PDTC123TT,235?
All PDTC123TT,235 units undergo pre-shipment inspection (PSI). If there is an issue with PDTC123TT,235, 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 PDTC123TT,235 part is unused and in its original packaging.
Return procedure for PDTC123TT,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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