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

Diodes Incorporated DDTA143TE-7-F

Name: DDTA143TE-7-F
Brand: Diodes Incorporated
SKU: DDTA143TE-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTA143TE-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SOT-523

Datasheet:: DDTA143TE-7-F.pdf

Description:: TRANS PREBIAS PNP 50V SOT523

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Product details

Overview

DDTA143TE-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT523 package with built-in 4.7 kΩ base resistor (R1 only), V_CEO = −50 V, I_C = −100 mA peak, V_CE(sat) ≤ −0.3 V at I_C/I_B = −1 mA/−0.1 mA, and h_FE = 100–600. It enables compact, reliable level-shifting and signal inversion in space-constrained consumer and industrial control circuits.

For engineers reviewing the DDTA143TE-7-F datasheet, DDTA143TE-7-F pinout, DDTA143TE-7-F application, or DDTA143TE-7-F equivalent, key selection criteria include verified R1-only biasing topology, guaranteed saturation performance at low drive current, SOT523 thermal resistance (833 °C/W), and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This device implements a single-resistor (R1) PNP bipolar junction transistor with no external base-emitter resistor (R2), simplifying PCB layout for digital input buffering and open-collector interface translation. Its fixed bias network sets base current directly from input voltage, eliminating discrete bias components while maintaining predictable turn-on threshold and saturation behavior.

The SOT523 package supports high-density mounting and delivers 150 mW power dissipation under standard FR4 conditions. Electrical characterization is specified under pulsed test conditions (≤300 µs pulse width, ≤2% duty cycle), ensuring stable DC gain (h_FE) and transition frequency (f_T = 250 MHz) across −55 °C to +150 °C operating range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Supports rail-to-rail signal inversion up to 50 V negative supply without breakdown.
I_C (peak)	−100 mA - Handles moderate switching loads such as LED drivers or logic-level translators.
V_CE(sat)	≤ −0.3 V @ I_C/I_B = −1 mA/−0.1 mA - Ensures low conduction loss and clean logic-low output in saturated switching.
R1	4.7 kΩ - Sets precise base current for predictable turn-on at ~0.7 V input threshold; eliminates external bias resistor.
h_FE	100–600 @ I_C = −1 mA, V_CE = −5 V - Provides wide DC gain margin for robust operation across process and temperature variation.
f_T	250 MHz @ V_CE = −10 V, I_E = 5 mA - Enables use in medium-speed digital interfaces up to ~100 Mbps edge rates.
P_D	150 mW - Limits continuous power handling; requires thermal derating above 25 °C ambient per published curve.

Pinout & Package

SOT523 is a 3-pin ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm), rated for moisture sensitivity Level 1 (J-STD-020), with matte tin-plated leads solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Connected to higher potential (e.g., V_CC or logic HIGH rail); current flows out of this pin in PNP operation.
2 (Base)	Base terminal with internal R1	Input node tied internally to 4.7 kΩ resistor; accepts TTL/CMOS-compatible logic signals for direct drive.
3 (Collector)	Collector terminal	Output node; sinks current when active; used for open-collector pull-down or inverted output stage.

Key Features

Feature	Design Value
R1-only bias network	Single 4.7 kΩ integrated base resistor reduces BOM count and layout area vs. discrete bias solutions.
Epitaxial planar die construction	Ensures tight parameter distribution and stable h_FE over temperature and lifetime.
AEC-Q101 qualified capability	Manufactured in IATF 16949-certified facilities; supports automotive signal conditioning with PPAP documentation.
Green, halogen-free packaging	UL 94V-0 molded compound with <900 ppm Br/Cl and <1000 ppm Sb meets global environmental compliance mandates.

Applications

Logic Level Translation

Microcontroller Input Protection

Use Scenario: Converting 3.3 V microcontroller GPIO outputs to interface with 5 V or 12 V peripheral logic inputs.

IC Role / Device Role / Timing Role: PNP inverter stage providing non-inverting signal translation via emitter-follower or common-emitter configuration.

Use Value: Eliminates need for dual-supply level shifters; leverages built-in R1 to ensure consistent input threshold and fast edge response.

Use Scenario: Protecting MCU GPIO pins from overvoltage transients on industrial sensor lines operating at ±12 V.

IC Role / Device Role / Timing Role: Clamping switch that conducts only during fault conditions, diverting surge current away from sensitive I/O.

Use Value: −50 V V_CEO and −5 V V_EBO provide robust reverse-bias blocking; SOT523 footprint allows placement adjacent to connector entry points.

LED Driver Interface

Power Supply Enable Control

Use Scenario: Driving common-anode indicator LEDs from low-side MCU outputs in portable devices.

IC Role / Device Role / Timing Role: High-side switch enabling current sourcing to LED anode while MCU controls cathode ground path.

Use Value: V_CE(sat) ≤ −0.3 V minimizes voltage drop and power loss; 100 mA peak rating supports multi-LED strings.

Use Scenario: Enabling/disabling auxiliary power rails (e.g., 3.3 V LDO) based on system sleep/wake state signals.

IC Role / Device Role / Timing Role: Low-power enable gate controlling base drive to downstream pass transistor or PMOS FET.

Use Value: R1 = 4.7 kΩ ensures sufficient base current for full saturation at <10 µA control signal, reducing quiescent current in standby mode.

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
DDTA143TK-7	Same die and R1 value, but in SOT-323 package (larger footprint, lower thermal resistance: 625 °C/W).	Preferred where board space permits and higher continuous power (200 mW) is required.	Select for improved thermal performance in sustained switching; not drop-in compatible due to different pad layout.
NSV143T1T1G	PNP pre-biased transistor with R1 = 4.7 kΩ, but includes R2 (base-emitter resistor); V_CEO = −50 V, V_CE(sat) ≤ −0.3 V.	Offers enhanced noise immunity in noisy environments due to R2 shunt path, but consumes slightly more input current.	Choose when EMI robustness is critical and extra 0.5 µA input leakage is acceptable.

Compared with DDTA143TE-7-F, DDTA143TK-7 trades miniaturization for thermal headroom, while NSV143T1T1G adds R2 for noise suppression at the cost of higher input bias current-both require layout or drive-current re-evaluation.

Availability

DDTA143TE-7-F is available at Aetrix Electronics and suitable for logic level translation, microcontroller input protection, and LED driver interface applications requiring stable component supply and RoHS-compliant manufacturing.

Supply support for DDTA143TE-7-F 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, application-optimized components for industrial, automotive, and consumer markets.

The DDTA series targets space-constrained digital interface design, delivering pre-biased transistors optimized for simplified logic interfacing, reduced PCB area, and AEC-Q101-ready reliability in signal conditioning paths.

FAQ

What is the function of the internal 4.7 kΩ resistor in DDTA143TE-7-F?

The internal 4.7 kΩ resistor (R1) connects between the base and input terminal, providing fixed base bias current without external components. It sets the turn-on threshold near 0.7 V and ensures predictable saturation when driven by standard CMOS/TTL logic levels, reducing design complexity and component count.

Can DDTA143TE-7-F be used in automotive applications?

Yes-DDTA143TE-7-F is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 in this specific reel lot, Diodes confirms its suitability for automotive signal conditioning with change-controlled qualification available upon request for production programs.

How does the SOT523 package affect thermal performance?

The SOT523 package has a thermal resistance of 833 °C/W (junction-to-ambient) on a 15 mm × 15 mm × 0.6 mm FR4 board with 1 oz copper. This limits continuous power dissipation to ~150 mW at 25 °C ambient; designers must apply derating above 25 °C using the published curve to avoid exceeding T_J(max) = +150 °C.

Is there a complementary NPN version of DDTA143TE-7-F?

Yes-the DDTC143TE-7-F is the complementary NPN pre-biased transistor with identical 4.7 kΩ R1 value, SOT523 package, and matching electrical specifications (V_CEO = 50 V, V_CE(sat) ≤ 0.3 V, h_FE = 100–600), enabling balanced push-pull or differential interface designs.

DDTA143TE-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-523

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP - Pre-Biased

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Resistor - Base (R1):: 4.7 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:: 150 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-523

DDTA143TE-7-F FAQ

1.How can I place an order for DDTA143TE-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTA143TE-7-F 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 DDTA143TE-7-F reliable?

The price and inventory of DDTA143TE-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA143TE-7-F is usually 5 days.

3.What payment methods are accepted for DDTA143TE-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA143TE-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTA143TE-7-F?

DDTA143TE-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTA143TE-7-F 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 DDTA143TE-7-F?

For technical support, including DDTA143TE-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA143TE-7-F requirements.

6.How does Aetrix verify that DDTA143TE-7-F is sourced from the original manufacturer or authorized distributors?

All DDTA143TE-7-F 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 DDTA143TE-7-F meets industry standards.

7.What is the process for return or replacement of DDTA143TE-7-F?

All DDTA143TE-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTA143TE-7-F, 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 DDTA143TE-7-F part is unused and in its original packaging.

Return procedure for DDTA143TE-7-F:

1.Submit a request within 90 days.

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

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