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

Diodes Incorporated DDTD142TU-7

Name: DDTD142TU-7
Brand: Diodes Incorporated
SKU: DDTD142TU-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTD142TU-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTD142TU-7.pdf

Description:: TRANS PREBIAS NPN 200MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:5,247

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Product details

Overview

DDTD142TU-7 from Diodes Incorporated is an NPN pre-biased transistor in SOT323 package, featuring a single integrated 0.47kΩ base resistor (R1), open-emitter configuration, 40V V_CEO, 500mA I_C, and h_FE of 100–600 at 5mA/5V - used for discrete logic-level switching in space-constrained PCBs.

For engineers reviewing the DDTD142TU-7 datasheet, DDTD142TU-7 pinout, DDTD142TU-7 application, or DDTD142TU-7 equivalent, key selection criteria include verified R1-only biasing topology, JEDEC-qualified reliability, SOT323 thermal derating behavior, and compatibility with 3.3V/5V digital drive interfaces in industrial control modules.

Technical Context

This device implements a monolithic NPN bipolar junction transistor with a single external-base resistor (R1 = 0.47kΩ) and no emitter resistor (R2 = open), enabling direct TTL/CMOS-compatible input drive without external bias components. It operates as a saturated switch with V_CE(sat) ≤ 0.3V at I_C = 50mA/I_B = 2.5mA.

Its 500mW power dissipation rating and 500°C/W θ_JA are defined on FR4 with minimum pad layout; gain-bandwidth product f_T = 200MHz supports high-speed switching up to ~10MHz under light capacitive loads, while BVEBO = 5V limits reverse-base-emitter voltage tolerance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum collector-emitter voltage before breakdown under open-base conditions; sets safe operating range for 24V industrial bus switching.
h_FE	100–600 - DC current gain at I_C = 5mA/V_CE = 5V; ensures robust saturation across process variation with minimal base drive current.
R1	0.47 kΩ - Integrated base resistor value; enables direct connection to 3.3V/5V logic outputs without external bias network.
V_CE(sat)	≤ 0.3 V - Collector-emitter saturation voltage at I_C = 50mA/I_B = 2.5mA; minimizes conduction loss in low-voltage load switching.
P_D	250 mW - Maximum continuous power dissipation on FR4 board; constrains usable duty cycle in pulsed applications above 100mA.
f_T	200 MHz - Gain-bandwidth product; confirms suitability for digital signal routing and moderate-speed PWM control (≤10MHz).

Pinout & Package

Package: SOT323 - ultra-small surface-mount plastic package (2.15 × 2.10 × 0.95 mm), lead-free, halogen-free, moisture sensitivity level 1, rated for −55°C to +150°C operation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Open connection - no internal resistor; requires external pull-down or direct grounding for switch-off control.
2 (Base)	Base terminal	Connected internally to R1 (0.47kΩ); accepts logic-level input directly from MCU GPIO or buffer output.
3 (Collector)	Collector terminal	Main switched output node; connects to load (e.g., LED anode, relay coil, MOSFET gate) referenced to V_CC.

Key Features

Feature	Design Value
Single R1 biasing	0.47kΩ integrated base resistor eliminates need for external bias components in standard logic-driven switches.
SOT323 footprint	2.15mm × 2.10mm body size enables high-density placement in compact consumer and automotive control modules.
JEDEC-qualified reliability	Qualified to AEC-Q101 stress test standards for high-reliability discrete transistors in automotive and industrial environments.
Green compound packaging	Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets RoHS 3 and IATF 16949 manufacturing requirements.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20mA indicator LEDs from 3.3V microcontroller pins in portable instrumentation.

IC Role / Device Role / Timing Role: Discrete NPN switch replacing discrete BJT + resistor pair; provides logic-level compatible on/off control.

Use Value: Reduces BOM count by one resistor per channel and saves 0.8mm² PCB area versus discrete implementation.

Use Scenario: Adding low-side switch capability to resource-constrained MCUs with limited GPIO drive strength.

IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between weak GPIO (4mA max) and 100mA solenoid load.

Use Value: Enables reliable saturation at I_B = 1.5mA (from 3.3V GPIO), delivering 150mA I_C with V_CE(sat) < 0.25V.

Industrial Sensor Interface

Automotive Door Module

Use Scenario: Isolating and switching 12V proximity sensor outputs in PLC I/O modules.

IC Role / Device Role / Timing Role: Low-side switch for sinking sensor return current; handles 40V transients per V_CEO rating.

Use Value: Survives ISO 7637-2 pulse 1a/b surges without clamping diodes due to 40V BV_CEO and 150°C T_J rating.

Use Scenario: Controlling interior lighting and window motor feedback signals in AEC-Q101-compliant door ECUs.

IC Role / Device Role / Timing Role: Pre-biased transistor for PWM dimming control of 5V cabin LEDs with precise duty-cycle fidelity.

Use Value: Delivers stable h_FE over temperature (−40°C to +125°C) ensuring consistent LED brightness across vehicle operating range.

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
DDTD142JU-7-F	Includes both R1 (0.47kΩ) and R2 (10kΩ); emitter resistor pulls down during off-state.	Better noise immunity in noisy environments; eliminates need for external pull-down but reduces flexibility in emitter-referenced loads.	Select when guaranteed turn-off under floating input or EMI-prone conditions is required.
NSVD142T1G	Same R1 = 0.47kΩ, open-emitter, but in SOT-23 package; higher P_D = 350mW; V_CEO = 50V.	Larger footprint (2.9 × 1.3 mm vs. 2.15 × 2.10 mm); better thermal margin for sustained 200mA loads.	Select when higher power handling or legacy SOT-23 board compatibility is prioritized over miniaturization.

Compared with DDTD142JU-7-F, DDTD142TU-7 offers simpler biasing for emitter-grounded loads but lacks built-in pull-down; versus NSVD142T1G, it delivers superior board-area efficiency at the cost of lower thermal headroom and non-SOT-23 footprint compatibility.

Availability

DDTD142TU-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive door modules, LED driver circuits, and microcontroller GPIO expansion requiring stable component supply and long-term obsolescence management.

Supply support for DDTD142TU-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 distribution operations across Asia, Europe, and North America.

The DDTD series belongs to Diodes' pre-biased transistor product line, engineered specifically for reducing component count and PCB area in digital switching applications where logic-level drive and predictable saturation behavior are critical.

FAQ

What is the function of the open-emitter configuration in DDTD142TU-7?

The open-emitter configuration means no internal resistor connects the emitter to ground, giving full control over emitter termination. This allows flexible use as a low-side switch with external pull-down, high-side driver with emitter-follower topology, or current-sink interface - unlike R2-equipped variants that fix emitter bias.

Can DDTD142TU-7 be used with 1.8V logic inputs?

No - its V_I(on) threshold is specified at 2.0V (typical) with 20mA output current, and V_I(off) is 0.3V. At 1.8V, base current falls below 1mA, resulting in incomplete saturation and elevated V_CE(sat); 3.3V or 5V logic sources are required for reliable switching.

Is DDTD142TU-7 qualified for automotive applications?

DDTD142TU-7 itself is not AEC-Q101 qualified; however, Diodes offers automotive-grade equivalents (e.g., DDTD142TUQ-7) with PPAP documentation, IATF 16949 manufacturing, and full AEC-Q101 stress testing - these carry a Q-suffix and are listed in Diodes' automotive product portal.

How does thermal performance change with PCB copper area?

θ_JA = 500°C/W assumes minimum recommended SOT323 pad layout on 1oz FR4. Doubling copper area (e.g., 2-layer thermal pads) reduces θ_JA to ~350°C/W, increasing allowable continuous I_C from ~150mA to ~220mA at +70°C ambient - verified via Diodes' derating curves in DS30398 Rev. 8-2.

DDTD142TU-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:: -

DDTD142TU-7 FAQ

1.How can I place an order for DDTD142TU-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTD142TU-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 DDTD142TU-7 reliable?

The price and inventory of DDTD142TU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTD142TU-7 is usually 5 days.

3.What payment methods are accepted for DDTD142TU-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTD142TU-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTD142TU-7?

DDTD142TU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTD142TU-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 DDTD142TU-7?

For technical support, including DDTD142TU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTD142TU-7 requirements.

6.How does Aetrix verify that DDTD142TU-7 is sourced from the original manufacturer or authorized distributors?

All DDTD142TU-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 DDTD142TU-7 meets industry standards.

7.What is the process for return or replacement of DDTD142TU-7?

All DDTD142TU-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTD142TU-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 DDTD142TU-7 part is unused and in its original packaging.

Return procedure for DDTD142TU-7:

1.Submit a request within 90 days.

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

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