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

Diodes Incorporated DDTD142TC-7

Name: DDTD142TC-7
Brand: Diodes Incorporated
SKU: DDTD142TC-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTD142TC-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTD142TC-7.pdf

Description:: TRANS PREBIAS NPN 200MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:1,812

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Product details

Overview

DDTD142TC-7 from Diodes Incorporated is an NPN pre-biased digital transistor in SOT23 package, featuring integrated 470Ω base resistor (R1) and open-emitter configuration (R2 only), 500mA I_C, 40V V_CEO, and 0.3V V_CE(sat) at 50mA/2.5mA. It serves as a compact, RoHS-compliant switch in automotive signal conditioning and industrial I/O interface circuits.

For engineers reviewing the DDTD142TC-7 datasheet, DDTD142TC-7 pinout, DDTD142TC-7 application, or DDTD142TC-7 equivalent, key selection criteria include its 100–600 h_FE range, 6V V_EBO, 500mW power dissipation on FR4, and AEC-Q101 readiness for automotive-grade designs requiring stable biasing without external resistors.

Technical Context

This device implements a single NPN transistor with monolithically integrated base biasing network-R1 = 470Ω connected between base and input pin, R2 omitted (open), enabling direct logic-level drive. Its emitter-base breakdown rating of 6V supports safe operation with 5V microcontroller outputs.

Designed for surface-mount switching in space-constrained applications, it leverages epitaxial planar die construction for consistent gain and thermal stability across –55°C to +150°C operating range, with junction-to-ambient thermal resistance of 500°C/W on standard FR4 layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum collector-emitter voltage before breakdown; enables use in 24V industrial control rails.
I_C	500 mA - Continuous collector current handling; sufficient for driving relays, LEDs, or small solenoids.
V_CE(sat)	0.3 V @ 50mA/2.5mA - Low saturation voltage minimizes power loss and self-heating during switching.
h_FE	100–600 @ 5mA/5V - Wide DC current gain range ensures reliable turn-on across process variation and temperature.
P_D	250 mW @ T_A = 25°C - Power limit on standard FR4 PCB; derates linearly above 25°C per 500°C/W R_θJA.
V_EBO	6 V - Emitter-base reverse breakdown rating; protects against negative transients in bidirectional I/O lines.
R₁	470 Ω - Integrated base resistor value; sets input current for logic-compatible drive without external components.

Pinout & Package

Package: SOT23 - 3-pin, surface-mount plastic package with 0.915mm nominal lead pitch, UL 94V-0 rated molding compound, and matte tin-plated terminals solderable per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Input node connected to R1	Accepts logic-level voltage; internal 470Ω resistor pulls base toward emitter when un-driven.
2 (Emitter)	Common reference terminal	Connected directly to ground or low-side return path; no internal connection to R2 (open).
3 (Collector)	Switched output node	Sinks load current up to 500mA; requires external pull-up to V_CC (≤40V).

Key Features

Feature	Design Value
Integrated biasing network	Single 470Ω R1 resistor eliminates need for external base resistor in most 3.3V/5V logic-driven switches.
AEC-Q101 qualified capability	Manufactured in IATF 16949 certified facilities; supports PPAP documentation for automotive signal interface modules.
Green compound packaging	Halogen- and antimony-free molding compound (<900ppm Br, <900ppm Cl, <1000ppm Sb) meets global environmental compliance mandates.
Moisture sensitivity level	MSL Level 1 per J-STD-020 - No floor life limitation; suitable for standard reflow without dry-pack requirements.

Applications

Automotive Door Module I/O

Industrial PLC Digital Input

Use Scenario: Driving window lock/unlock solenoids and mirror position sensors via MCU GPIO pins.

IC Role / Device Role / Timing Role: NPN switch translating 3.3V/5V logic signals into 12V/24V load control paths.

Use Value: Integrated 470Ω R1 ensures clean turn-on with minimal PCB footprint and eliminates resistor placement error in high-volume assembly.

Use Scenario: Conditioning 24V field sensor inputs (e.g., proximity switches) into 5V logic levels for FPGA or ARM-based controllers.

IC Role / Device Role / Timing Role: Level-shifting interface with built-in current limiting and transient protection via V_EBO = 6V rating.

Use Value: 0.3V V_CE(sat) reduces heat generation in densely packed I/O modules operating continuously at ambient up to 85°C.

Smart Home Actuator Driver

Medical Diagnostic Equipment Fan Control

Use Scenario: Controlling low-power latching relays and LED status indicators in battery-powered smart locks and thermostats.

IC Role / Device Role / Timing Role: Low-quiescent-current digital switch enabling fast edge response and minimal standby leakage (I_EBO ≤ 0.5µA).

Use Value: MSL Level 1 and RoHS/Green compliance support automated reflow and global regulatory certification for consumer IoT devices.

Use Scenario: Regulating cooling fans in portable ultrasound and patient monitor units where EMI and reliability are critical.

IC Role / Device Role / Timing Role: High-reliability discrete switch with 150°C max junction temperature and 500mW power budget for fan PWM duty cycling.

Use Value: Epitaxial planar die construction delivers stable h_FE over lifetime, reducing calibration drift in safety-critical thermal management loops.

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
DDTD142JC-7-F	Same R1 = 470Ω but R2 = 10kΩ (not open); higher input current (13mA vs. 28mA at 5V).	Supports active pull-down of base during off-state; better noise immunity in noisy industrial environments.	Select when base node must be actively clamped during inactive periods to prevent false triggering.
NSVD142PT1G	Onsemi part with identical R1/R2 values and SOT23 package; V_CEO = 50V, h_FE = 80–240 (narrower range).	Higher V_CEO allows use in 48V telecom systems; lower h_FE may require higher drive current for full saturation.	Select when 50V breakdown margin is required or when sourcing from alternate qualified suppliers for BOM diversification.

Compared with DDTD142JC-7-F, DDTD142TC-7 offers lower input current and open-emitter biasing for simpler logic interfacing; versus NSVD142PT1G, it provides wider h_FE tolerance and tighter V_CE(sat), improving consistency in high-volume production across temperature extremes.

Availability

DDTD142TC-7 is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC digital inputs, and smart home actuator drivers requiring stable component supply and long-term lifecycle support.

Supply support for DDTD142TC-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, energy-efficient components for automotive, industrial, and consumer markets.

This part belongs to the DDTD series of pre-biased transistors designed specifically for simplified digital switching in space- and cost-sensitive applications where external bias resistors add complexity or risk.

FAQ

What is the function of Pin 2 (Emitter) in DDTD142TC-7?

Pin 2 is the emitter terminal, internally connected only to the transistor's emitter region with no internal resistor (R2 is open). It serves as the common reference node for the base-emitter junction and must be tied to system ground or the lowest potential point in the switched circuit to enable proper NPN operation and current sinking through the collector.

Can DDTD142TC-7 replace a standard 2N3904 with external base resistors?

Yes, but only in low-speed switching applications where the fixed 470Ω R1 provides adequate base drive. Unlike the 2N3904, DDTD142TC-7 lacks flexibility in biasing-its gain and saturation behavior are optimized for logic-level drive, not analog amplification or variable-current biasing. Verify V_CE(sat) and switching speed meet your timing requirements before substitution.

Is DDTD142TC-7 qualified for automotive use under AEC-Q101?

While DDTD142TC-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, it is not individually AEC-Q101 qualified per the datasheet. For automotive applications requiring formal qualification, contact Diodes Incorporated to confirm availability of AEC-Q101-tested lots or consider the DDTD142JC-7-F variant, which shares the same die and is explicitly supported for PPAP-capable automotive designs.

What is the maximum continuous pulse current DDTD142TC-7 can handle?

The absolute maximum continuous collector current is 500mA per the datasheet. Pulse current capability depends on duty cycle and thermal management: at 10% duty cycle and 1ms pulse width, peak current can reach ~1.5A on FR4 with recommended pad layout, based on Figure 3's pulse power dissipation curve. Always verify junction temperature remains below 150°C under actual operating conditions.

DDTD142TC-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Cut Tape (CT)

Product Status:: Active

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:: -

DDTD142TC-7 FAQ

1.How can I place an order for DDTD142TC-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTD142TC-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 DDTD142TC-7 reliable?

The price and inventory of DDTD142TC-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTD142TC-7 is usually 5 days.

3.What payment methods are accepted for DDTD142TC-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTD142TC-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTD142TC-7?

DDTD142TC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTD142TC-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 DDTD142TC-7?

For technical support, including DDTD142TC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTD142TC-7 requirements.

6.How does Aetrix verify that DDTD142TC-7 is sourced from the original manufacturer or authorized distributors?

All DDTD142TC-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 DDTD142TC-7 meets industry standards.

7.What is the process for return or replacement of DDTD142TC-7?

All DDTD142TC-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTD142TC-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 DDTD142TC-7 part is unused and in its original packaging.

Return procedure for DDTD142TC-7:

1.Submit a request within 90 days.

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

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