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Diodes Incorporated DDTC144TCA-7
- Part No.:
- DDTC144TCA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTC144TCA-7.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,843
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Product details
Overview
DDTC144TCA-7 from Diodes Incorporated is an NPN pre-biased transistor in SOT23 package with a single 47 kΩ base bias resistor (R1), VCEO = 50 V, IC(max) = 100 mA, VCE(sat) ≤ 0.3 V at IC/IB = 1 mA/0.1 mA, and hFE = 100–250 at IC = 1 mA. It enables compact, reliable switching in low-power digital interface circuits.
For engineers reviewing the DDTC144TCA-7 datasheet, DDTC144TCA-7 pinout, DDTC144TCA-7 application, or DDTC144TCA-7 equivalent, key selection criteria include its R1-only bias topology, SOT23 thermal performance (RθJA = 625 °C/W), guaranteed VCE(sat) under defined drive conditions, and automotive-grade variants (e.g., DDTC144TCAQ) for AEC-Q101-compliant designs.
Technical Context
This device integrates a single 47 kΩ base resistor (R1) to simplify external bias network design-no R2 feedback path-making it suitable for fixed-gain, low-current switching where predictable turn-on threshold and reduced PCB footprint are critical. Its epitaxial planar construction ensures stable hFE across temperature (−55°C to +150°C).
It operates as a saturated switch with VCE(sat) ≤ 0.3 V when driven with IB = 0.1 mA into a 1 mA collector load, and exhibits fT = 250 MHz-sufficient for digital logic interfacing and moderate-speed signal routing, but not RF amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum allowable collector-emitter voltage before breakdown; supports 24 V and 36 V industrial bus interfaces. |
| IC(max) | 100 mA - Continuous collector current limit; suitable for driving LEDs, small relays, or logic-level translators. |
| VCE(sat) | ≤ 0.3 V at IC/IB = 1 mA/0.1 mA - Ensures low conduction loss and minimal self-heating in battery-powered or thermally constrained layouts. |
| hFE | 100–250 at IC = 1 mA, VCE = 5 V - Predictable DC gain range enables robust digital on/off control without gain-dependent timing variation. |
| R1 | 47 kΩ ±30% - Single integrated base resistor eliminates external component count and layout sensitivity for basic switching. |
| PD | 200 mW - Power dissipation limit on FR4 board; requires derating above +25°C ambient per Fig. 1 curve. |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic package with 0.915 mm nominal lead pitch, 2.40 mm body length, and 1.30 mm body width; RoHS-compliant matte tin plating; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for bias current; connects to ground or low-side return path in common-emitter configuration. |
| 2 (Base) | Input control node | Connected internally to R1; accepts logic-level input (e.g., 3.3 V or 5 V MCU GPIO) to activate switching. |
| 3 (Collector) | Output current path | Drives load (e.g., LED anode or relay coil); must be connected to positive supply through load. |
Key Features
| Feature | Design Value |
|---|---|
| R1-only bias topology | Single 47 kΩ integrated resistor reduces BOM count and eliminates R2 matching uncertainty in standard switch designs. |
| SOT23 footprint | Standardized 3-pin package compatible with high-volume pick-and-place assembly and reflow profiles (J-STD-020 Level 1). |
| Ambient operating range | −55°C to +150°C - Enables deployment in under-hood automotive, industrial controls, and outdoor power electronics. |
| Green compound | Halogen- and antimony-free molding compound (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb) meets global environmental compliance mandates. |
Applications
| LED Indicator Control | Microcontroller GPIO Interface |
|---|---|
|
Use Scenario: Driving status LEDs from 3.3 V or 5 V microcontroller outputs in embedded instrumentation panels. IC Role / Device Role: Low-side saturated switch that isolates MCU pins from LED current paths. Use Value: Eliminates need for discrete base resistor; VCE(sat) ≤ 0.3 V ensures >90% LED forward voltage utilization at 1–10 mA drive. |
Use Scenario: Level-shifting and current amplification between low-drive-strength MCU GPIOs and higher-current peripherals. IC Role / Device Role: Digital buffer/switch enabling safe interface between 3.3 V logic and 5 V or 12 V loads. Use Value: Guaranteed hFE ≥ 100 at 1 mA ensures reliable turn-on even with marginal GPIO output voltage or aging effects. |
| Small Relay Driver | Power Supply Enable Circuit |
|
Use Scenario: Activating 5 V or 12 V signal relays in programmable logic controllers and HVAC control modules. IC Role / Device Role: Solid-state replacement for mechanical driver transistors in low-energy coil drive applications. Use Value: 100 mA IC(max) and 50 V VCEO support typical 5–24 V relay coils with margin for back-EMF suppression. |
Use Scenario: Enabling/disabling auxiliary power rails (e.g., 3.3 V or 5 V LDO outputs) based on system state signals. IC Role / Device Role: High-side or low-side enable switch controlling PMOS/NMOS pass transistor gate drive. Use Value: R1 tolerance (±30%) and stable hFE ensure consistent enable threshold across temperature and process variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTC143TCA-7-F | 4.7 kΩ R1, hFE = 600–630 at IC = 5 mA | Higher gain and lower R1 suit higher-current switching (>5 mA) with tighter VCE(sat) control at elevated IC. | Select when driving loads >5 mA with 5 V logic; avoid if 3.3 V GPIO drive margin is limited. |
| DDTC124TCA-7-F | 22 kΩ R1, hFE = 100–250 at IC = 2.5 mA | Intermediate R1 value provides better drive compatibility with 3.3 V MCUs than DDTC144TCA-7 while retaining same gain range. | Prefer for mixed-voltage systems where 3.3 V GPIO must reliably saturate the transistor without overdriving base. |
Compared with DDTC144TCA-7, DDTC143TCA-7-F delivers higher gain at higher currents but risks insufficient base drive from 3.3 V sources, while DDTC124TCA-7-F offers more balanced biasing for mid-range logic voltages-making it a safer choice for general-purpose 3.3 V interface use.
Availability
DDTC144TCA-7 is available at Aetrix Electronics and suitable for LED indicator control, microcontroller GPIO interface, and small relay driver applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for DDTC144TCA-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-qualified components for automotive, industrial, and consumer markets.
The DDTC (R1-ONLY SERIES) CA product line delivers pre-biased transistors optimized for space-constrained digital switching-designed to reduce bill-of-materials complexity and improve yield in high-volume PCB assembly.
FAQ
What is the function of the internal 47 kΩ resistor in DDTC144TCA-7?
The internal 47 kΩ resistor (R1) connects between the base and emitter terminals, providing fixed base biasing to eliminate the need for an external resistor. This simplifies circuit design for digital switching applications, ensures consistent turn-on behavior across units, and improves PCB layout efficiency by reducing component count and routing complexity.
Can DDTC144TCA-7 replace a standard NPN transistor like BC847 in a switching circuit?
Yes, but only when the circuit uses base biasing and does not require adjustable gain or linear operation. DDTC144TCA-7 is optimized for saturated switching-not amplification-with fixed R1 biasing. It replaces BC847 in applications where external base resistors are removed and drive current is limited to ≤0.1 mA, ensuring VCE(sat) stays ≤0.3 V.
Is DDTC144TCA-7 qualified for automotive applications?
No-the DDTC144TCA-7 is not AEC-Q101 qualified. However, its automotive-grade variant DDTC144TCAQ-7-F is fully AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. For automotive designs, DDTC144TCAQ-7-F must be specified to meet reliability and change-control requirements.
How does the SOT23 package affect thermal performance in continuous operation?
With RθJA = 625 °C/W on FR4 board using minimum recommended pad layout, DDTC144TCA-7 dissipates up to 200 mW at +25°C ambient. At 100 mA and 0.3 V VCE(sat), power dissipation is 30 mW-resulting in ~18.75°C junction rise. Derating is required above +25°C per Fig. 1; full-rated current is not sustainable at >85°C ambient without thermal relief.
DDTC144TCA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- NPN - Pre-Biased
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 47 kOhms
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 250µA, 2.5mA
- Current - Collector Cutoff (Max):
- 500nA (ICBO)
- Frequency - Transition:
- 250 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DDTC144TCA-7 FAQ
1.How can I place an order for DDTC144TCA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC144TCA-7 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 DDTC144TCA-7 reliable?
The price and inventory of DDTC144TCA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC144TCA-7 is usually 5 days.
3.What payment methods are accepted for DDTC144TCA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC144TCA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC144TCA-7?
DDTC144TCA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC144TCA-7 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 DDTC144TCA-7?
For technical support, including DDTC144TCA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC144TCA-7 requirements.
6.How does Aetrix verify that DDTC144TCA-7 is sourced from the original manufacturer or authorized distributors?
All DDTC144TCA-7 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 DDTC144TCA-7 meets industry standards.
7.What is the process for return or replacement of DDTC144TCA-7?
All DDTC144TCA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC144TCA-7, 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 DDTC144TCA-7 part is unused and in its original packaging.
Return procedure for DDTC144TCA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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