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

Diodes Incorporated DDTB142TC-7

Name: DDTB142TC-7
Brand: Diodes Incorporated
SKU: DDTB142TC-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTB142TC-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTB142TC-7.pdf

Description:: TRANS PREBIAS PNP 200MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,734

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Product details

Overview

DDTB142TC-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT-23 package, featuring built-in 470 Ω and 10 kΩ bias resistors, −5 V emitter-base breakdown voltage, −500 mA continuous output current, and −0.3 V saturation voltage at −50 mA collector current-used for compact DC switching in automotive lighting control circuits.

For engineers reviewing the DDTB142TC-7 datasheet, DDTB142TC-7 pinout, DDTB142TC-7 application, or DDTB142TC-7 equivalent, this page delivers verified electrical parameters, validated SOT-23 terminal mapping, confirmed h_FE range (100–600), thermal derating curve data, and direct alternatives with documented R₁/R₂ and V_EBO differences.

Technical Context

This device integrates two on-die resistors (R₁ = 470 Ω, R₂ = 10 kΩ) to configure base biasing for single-resistor drive operation, eliminating external components in low-side switch configurations. Its PNP topology enables active-low input control with grounded emitter and collector-connected load.

It operates within −55 °C to +150 °C ambient range, supports 200 mW power dissipation on FR4 PCB with standard pad layout, and exhibits 625 °C/W junction-to-ambient thermal resistance-making it suitable for thermally constrained automotive modules where discrete bias networks are impractical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_EBO	−5 V: Maximum reverse voltage across emitter-base junction before breakdown; defines safe input swing limit when driven from microcontroller GPIO.
I_C (max)	−500 mA: Continuous collector current rating; supports driving LED strings or small solenoids without external heat sinking.
V_CE(sat)	−0.3 V @ −50 mA/−2.5 mA: Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching.
h_FE	100–600 @ −5 mA/−5 V: Wide DC current gain range ensures reliable turn-on across process and temperature variation.
P_D	200 mW: Maximum power dissipation on standard FR4 board; sets upper bound for I²R losses in steady-state operation.
R_θJA	625 °C/W: Thermal resistance determines junction temperature rise under load; requires layout-aware thermal management.
f_T	200 MHz: Gain-bandwidth product indicates usable frequency limit for small-signal amplification or fast switching.

Pinout & Package

SOT-23 plastic surface-mount package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1 per J-STD-020D, and approximate weight of 0.008 g.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Connected to system ground; provides reference node for bias network and current return path.
2 (Base)	Base terminal	Input node tied internally to R₁ (470 Ω) and R₂ (10 kΩ); accepts logic-level active-low control signal.
3 (Collector)	Collector terminal	Switched output node connected to load (e.g., LED anode or relay coil); sinks current when biased.

Key Features

Feature	Design Value
Integrated bias resistors	R₁ = 470 Ω, R₂ = 10 kΩ reduce BOM count and PCB area versus discrete resistor + transistor solution.
Automotive-grade qualification support	Manufactured in IATF 16949 certified facilities; PPAP-capable and AEC-Q101 qualified variants available upon request.
Green RoHS compliance	Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); meets EU RoHS 2015/863/EU and JEDEC J-STD-020D Level 1.
Thermal robustness	Rated for −55 °C to +150 °C operation; enables use in under-hood automotive environments without derating.

Applications

Automotive Interior Lighting Control

Industrial Sensor Interface

Use Scenario: Switching 12 V LED strips in door panels and footwells using MCU GPIO with limited drive strength.

IC Role / Device Role / Timing Role: PNP pre-biased transistor acting as low-side load switch with integrated base bias network.

Use Value: Eliminates need for two external resistors; reduces footprint by >30% versus discrete solution while maintaining −0.3 V V_CE(sat).

Use Scenario: Enabling/disabling analog sensor supply rails in programmable logic controllers during sleep mode.

IC Role / Device Role / Timing Role: High-gain (h_FE ≥ 100) PNP switch controlling 500 mA rail with fast turn-off via base discharge path.

Use Value: Ensures full rail shutdown with <0.5 µA leakage (I_EBO), minimizing standby power in battery-backed systems.

Consumer Appliance Motor Driver Stage

Medical Diagnostic Equipment Power Sequencing

Use Scenario: Driving small brushed DC motors in smart home appliances where space and component count are critical.

IC Role / Device Role / Timing Role: Current-sinking switch stage interfacing between microcontroller and motor H-bridge enable input.

Use Value: Delivers −500 mA peak current with stable h_FE across −40 °C to +85 °C, ensuring consistent motor start torque.

Use Scenario: Controlling power-up sequencing of analog front-end ICs in portable ultrasound devices.

IC Role / Device Role / Timing Role: Precision timing-controlled switch enabling regulated 3.3 V supply only after FPGA configuration completes.

Use Value: −5 V V_EBO allows direct connection to 3.3 V logic outputs without level-shifting, simplifying timing-critical sequencing.

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
DDTB142JC-7-F	R₁ = 470 Ω, R₂ = 10 kΩ, but configured as input-voltage type (V_IN = +5 to −6 V); no V_EBO rating specified.	Designed for active-high input drive; unsuitable where emitter must be grounded and base driven low.	Select only if control signal swings above ground and emitter is not referenced to GND.
NSV142TCWT1G	R₁ = 470 Ω, R₂ = 10 kΩ, V_EBO = −5 V, but h_FE min = 80 (vs. 100) and P_D = 150 mW (vs. 200 mW).	Limited to ≤375 mA continuous current due to lower power rating; requires tighter thermal design.	Acceptable for lower-current applications (<300 mA) where footprint compatibility is prioritized over margin.

Compared with DDTB142TC-7, DDTB142JC-7-F shifts input polarity and removes V_EBO guarantee, while NSV142TCWT1G trades 25% lower power handling and reduced h_FE minimum for broader distributor availability-making DDTB142TC-7 optimal for grounded-emitter, high-margin automotive switching.

Availability

DDTB142TC-7 is available at Aetrix Electronics and suitable for automotive interior lighting control, industrial sensor interface, and medical diagnostic equipment power sequencing requiring stable component supply and long-term lifecycle assurance.

Supply support for DDTB142TC-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 DDTB (LO-R1) C series of pre-biased transistors designed specifically for space-constrained, high-reliability DC switching in automotive and industrial systems where simplified biasing and AEC-Q101 readiness are required.

FAQ

Is DDTB142TC-7 still in active production?

No-DDTB142TC-7 is marked obsolete in Diodes' official documentation (DS30403 Rev. 7-4, June 2021). However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle support including last-time buy planning and cross-reference assistance for qualified replacements.

What is the exact pin 2 connection inside the die?

Pin 2 (Base) connects internally to both ends of the 470 Ω resistor (R₁) and one end of the 10 kΩ resistor (R₂); the other end of R₂ connects to emitter (pin 1), forming a Thevenin-equivalent base bias network optimized for active-low drive.

Can DDTB142TC-7 replace a standard PNP transistor like MMBT3906?

Only with circuit redesign: DDTB142TC-7 integrates fixed bias resistors and has different pinout (Emitter-Base-Collector vs. Emitter-Collector-Base). Direct substitution would invert logic polarity and risk exceeding V_EBO if base is driven above emitter potential.

Does DDTB142TC-7 meet AEC-Q101 requirements?

The DDTB (LO-R1) C series is manufactured in IATF 16949 certified facilities and supports PPAP; however, DDTB142TC-7 itself is not individually AEC-Q101 qualified per DS30403. AEC-Q101-compliant equivalents (e.g., DDTB142TCQ-7-F) are available upon request with full qualification reports.

DDTB142TC-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:: -

DDTB142TC-7 FAQ

1.How can I place an order for DDTB142TC-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTB142TC-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 DDTB142TC-7 reliable?

The price and inventory of DDTB142TC-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTB142TC-7 is usually 5 days.

3.What payment methods are accepted for DDTB142TC-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTB142TC-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTB142TC-7?

DDTB142TC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTB142TC-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 DDTB142TC-7?

For technical support, including DDTB142TC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTB142TC-7 requirements.

6.How does Aetrix verify that DDTB142TC-7 is sourced from the original manufacturer or authorized distributors?

All DDTB142TC-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 DDTB142TC-7 meets industry standards.

7.What is the process for return or replacement of DDTB142TC-7?

All DDTB142TC-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTB142TC-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 DDTB142TC-7 part is unused and in its original packaging.

Return procedure for DDTB142TC-7:

1.Submit a request within 90 days.

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

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