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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

Diodes Incorporated DDTA144TCA-7

Name: DDTA144TCA-7
Brand: Diodes Incorporated
SKU: DDTA144TCA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTA144TCA-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTA144TCA-7.pdf

Description:: TRANS PREBIAS PNP 200MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,825

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Product details

Overview

DDTA144TCA-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package with built-in 47 kΩ bias resistor (R1 only), −50 V V_CEO, −100 mA I_C, 200 mW power dissipation, and h_FE of 100–600 at I_C = −1 mA. It enables compact, reliable switching in low-power digital interface and level-shifting circuits.

For engineers reviewing the DDTA144TCA-7 datasheet, DDTA144TCA-7 pinout, DDTA144TCA-7 application, or DDTA144TCA-7 equivalent, key selection criteria include its single-resistor bias topology, guaranteed V_CE(sat) ≤ −0.3 V at I_C/I_B = −1 mA/−0.1 mA, AEC-Q101 qualification readiness, and SOT23 footprint compatibility with space-constrained PCB layouts.

Technical Context

This device integrates a PNP bipolar junction transistor with a monolithic 47 kΩ base-emitter pull-up resistor (R1), eliminating external bias components. Its R1-only configuration simplifies design for fixed-gain, low-current switching where base drive current is derived directly from logic-level signals.

It operates across −55°C to +150°C, supports V_CB and V_CE up to −50 V, and delivers h_FE ≥ 100 under standard test conditions (V_CE = −5 V, I_C = −1 mA). The 625°C/W R_θJA reflects thermal performance on FR4 with minimum pad layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Supports rail-to-rail switching in 3.3 V and 5 V logic systems with margin against transients.
I_C (max)	−100 mA - Suitable for driving LEDs, small relays, or logic inputs without external current limiting.
V_CE(sat)	≤ −0.3 V at I_C/I_B = −1 mA/−0.1 mA - Ensures low conduction loss and minimal voltage drop in saturated switch mode.
h_FE	100–600 at I_C = −1 mA, V_CE = −5 V - Provides predictable gain for consistent turn-on behavior across production lots.
R1	47 kΩ ±30% - Enables direct connection to 3.3 V/5 V microcontroller outputs without external base resistor.
P_D	200 mW - Limits continuous operation to ≤100 mA at ambient ≤75°C on standard FR4 board.
T_J Range	−55°C to +150°C - Qualified for under-hood automotive and industrial control environments.

Pinout & Package

Package: SOT23 - Surface-mount plastic package measuring 2.90 mm × 1.30 mm × 1.03 mm (L × W × H), moisture sensitivity level 1, matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal of PNP transistor	Connected to higher potential rail; current flows out of this pin when active.
2 (Base)	Base node tied internally to R1	Internally connected to 47 kΩ resistor; accepts logic-level input to enable conduction.
3 (Collector)	Collector terminal of PNP transistor	Connected to load; sinks current when transistor is saturated (low-side switch configuration).

Key Features

Feature	Design Value
Single integrated bias resistor (R1)	Eliminates need for external base resistor, reducing BOM count and PCB area in discrete logic-level interface designs.
Epitaxial planar die construction	Ensures stable h_FE and low leakage (I_CBO, I_EBO ≤ −0.5 μA) over temperature and lifetime.
AEC-Q101 qualification support	Manufactured in IATF 16949-certified facilities with PPAP capability-enables use in automotive body electronics and infotainment modules.
Green, halogen- and antimony-free	Meets RoHS 3 (2015/863/EU) and JEDEC J-STD-020 Level 1 standards for environmental compliance and solderability.

Applications

LED Driver Interface

Microcontroller GPIO Expander

Use Scenario: Driving indicator LEDs from 3.3 V MCU GPIO pins with current limiting via collector resistor.

IC Role / Device Role / Timing Role: Low-side PNP switch that inverts logic and provides current sink path to ground.

Use Value: Eliminates external base resistor; V_CE(sat) ≤ −0.3 V ensures >90% LED forward voltage utilization at 5–10 mA.

Use Scenario: Extending limited GPIO count by enabling/disabling peripheral ICs (e.g., sensors, DACs) via active-low enable lines.

IC Role / Device Role / Timing Role: Level-shifting buffer that converts 3.3 V logic-high to ~0 V output for enable inputs requiring active-low assertion.

Use Value: 47 kΩ R1 allows direct connection to MCU pins; h_FE ≥ 100 guarantees robust turn-on even with weak drive strength.

Power Rail Sequencing

Industrial Sensor Signal Conditioning

Use Scenario: Controlling power-up sequence of auxiliary rails (e.g., analog supply after core logic) using reset-controlled base drive.

IC Role / Device Role / Timing Role: Delayed-turn-on switch activated only after system reset deasserts, preventing premature biasing.

Use Value: −50 V V_CEO withstands back-EMF during rail transitions; T_J range supports operation in sealed enclosures up to 85°C ambient.

Use Scenario: Isolating sensor output lines from noisy digital sections in 4–20 mA transmitter modules.

IC Role / Device Role / Timing Role: Digital isolation switch that disconnects sensor signal path during calibration or fault states.

Use Value: Low I_CBO (≤ −0.5 μA) prevents leakage-induced offset errors; SOT23 footprint fits high-density sensor PCBs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP pre-biased transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DDTA144W-7	Same R1 = 47 kΩ, but uses SOT323 package (smaller footprint, 1.7 mm × 1.25 mm) and has lower P_D = 150 mW.	Suitable for ultra-dense layouts where board space is critical, but not recommended for >60 mA continuous loads.	Select when PCB real estate is constrained and thermal budget permits reduced power handling.
NSVDDTA144T1X	AEC-Q101 qualified version with identical R1, V_CEO, and h_FE, but tighter R1 tolerance (±20%) and enhanced ESD rating (HBM 8 kV).	Required for automotive safety-critical modules (e.g., ADAS lighting control) needing full PPAP documentation and extended reliability testing.	Choose for automotive OEM programs requiring certified change control and traceable manufacturing records.

Compared with DDTA144W-7, DDTA144TCA-7 offers higher power margin (200 mW vs. 150 mW) and larger SOT23 thermal pad area; versus NSVDDTA144T1X, it lacks AEC-Q101 certification but provides cost-optimized sourcing for industrial and consumer applications.

Availability

DDTA144TCA-7 is available at Aetrix Electronics and suitable for LED driver interfaces, microcontroller GPIO expansion, and industrial sensor signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for DDTA144TCA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

This part belongs to the DDTA (R1-Only Series) CA family-designed specifically for cost-sensitive, space-constrained digital interface applications where simplified biasing and guaranteed saturation performance are essential.

FAQ

What is the function of the internal 47 kΩ resistor in DDTA144TCA-7?

The internal 47 kΩ resistor connects between base and emitter (R1-only configuration), providing automatic biasing for PNP transistor turn-on when a logic-high voltage is applied to the base pin. This eliminates the need for an external base resistor, reduces component count, and ensures consistent switching behavior across operating temperatures and process variations.

Can DDTA144TCA-7 be used in automotive applications?

DDTA144TCA-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, but it is not formally AEC-Q101 qualified. For production automotive use, Diodes recommends NSVDDTA144T1X-the qualified variant with tighter R1 tolerance and enhanced ESD protection. DDTA144TCA-7 may be used in non-safety automotive subsystems pending internal qualification.

How does DDTA144TCA-7 differ from DDTA144W-7?

Both share identical electrical specs (R1 = 47 kΩ, V_CEO = −50 V, h_FE = 100–600), but DDTA144W-7 uses the smaller SOT323 package (1.7 mm × 1.25 mm) with lower power dissipation (150 mW vs. 200 mW) and higher thermal resistance. DDTA144TCA-7's SOT23 package offers better thermal performance and mechanical robustness for higher-current or thermally demanding layouts.

Is DDTA144TCA-7 lead-free and RoHS compliant?

Yes-DDTA144TCA-7 is fully RoHS 3 compliant (2015/863/EU), lead-free, halogen-free (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb), and antimony-free. It carries the "Green" designation per Diodes Incorporated's specifications and meets UL 94V-0 flammability rating with matte tin-plated leads solderable per MIL-STD-202, Method 208.

DDTA144TCA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Transistor Type:: -

Current - Collector (Ic) (Max):: -

Voltage - Collector Emitter Breakdown (Max):: -

Resistor - Base (R1):: -

Resistor - Emitter Base (R2):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

Frequency - Transition:: -

Power - Max:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

DDTA144TCA-7 FAQ

1.How can I place an order for DDTA144TCA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTA144TCA-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 DDTA144TCA-7 reliable?

The price and inventory of DDTA144TCA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA144TCA-7 is usually 5 days.

3.What payment methods are accepted for DDTA144TCA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA144TCA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTA144TCA-7?

DDTA144TCA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTA144TCA-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 DDTA144TCA-7?

For technical support, including DDTA144TCA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA144TCA-7 requirements.

6.How does Aetrix verify that DDTA144TCA-7 is sourced from the original manufacturer or authorized distributors?

All DDTA144TCA-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 DDTA144TCA-7 meets industry standards.

7.What is the process for return or replacement of DDTA144TCA-7?

All DDTA144TCA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA144TCA-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 DDTA144TCA-7 part is unused and in its original packaging.

Return procedure for DDTA144TCA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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