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

Diodes Incorporated DDTA122LU-7

Name: DDTA122LU-7
Brand: Diodes Incorporated
SKU: DDTA122LU-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTA122LU-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTA122LU-7.pdf

Description:: TRANS PREBIAS PNP 200MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:3,216

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Product details

Overview

DDTA122LU-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT-323 package, featuring integrated 220 Ω and 10 kΩ bias resistors (R1/R2), −50 V V_CBO, −40 V V_CEO, −0.3 V V_CE(sat) at −5 mA/−0.25 mA, and DC current gain (h_FE) of 100–600. It serves as a logic-level interface switch in low-power digital control circuits, such as microcontroller I/O buffering and LED driver enable stages.

For engineers reviewing the DDTA122LU-7 datasheet, DDTA122LU-7 pinout, DDTA122LU-7 application, or DDTA122LU-7 equivalent, key selection criteria include verified R1/R2 resistor values, guaranteed V_CE(sat) under −5 mA load, SOT-323 thermal resistance (625 °C/W), and compatibility with 3.3 V/5 V logic-driven switching where base-resistor integration reduces PCB footprint and BOM count.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with two on-die silicon-based biasing resistors-R1 (220 Ω) connected between base and emitter, R2 (10 kΩ) between base and collector-enabling single-resistor input drive without external bias network. It operates in saturation mode for digital switching, with guaranteed turn-on voltage (V_I(on)) ≤ −2.0 V at −20 mA output.

Designed for ambient temperatures from −55 °C to +150 °C, it delivers stable DC current transfer ratio (h_FE) across its operating range and exhibits f_T = 200 MHz, supporting high-speed digital transitions while maintaining low leakage (I_CBO ≤ −0.5 µA at −50 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−50 V - maximum reverse voltage from collector to base before breakdown; enables use in −48 V telecom bias rails
V_CEO	−40 V - safe collector-emitter blocking voltage under open-base condition; supports industrial −24 V bus switching
V_CE(sat)	−0.3 V @ I_C = −5 mA, I_B = −0.25 mA - low saturation voltage minimizes power loss in active-low switch applications
h_FE	100–600 @ I_C = −1 mA, V_CE = −5 V - wide gain range ensures reliable switching across process variation and temperature
R1 / R2	220 Ω / 10 kΩ - fixed internal bias network eliminates need for external resistors, reducing layout area by ~2.5 mm²
P_D	200 mW @ T_A = 25 °C - power rating validated on FR4 board with recommended pad layout per AP02001
f_T	200 MHz - usable for digital signal edges up to ~100 MHz with controlled rise/fall times

Pinout & Package

SOT-323 (SC-70) surface-mount plastic package, 0.006 g weight, UL 94V-0 rated molding compound, moisture sensitivity level 1 per J-STD-020C.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Common reference node for input logic; connects to system ground or low-side return path
2 (Base)	Control input node	Internally tied to R1 (220 Ω) and R2 (10 kΩ); accepts TTL/CMOS-compatible negative-going logic signals
3 (Collector)	Switched output node	Drives load to V_CC (typically −5 V to −24 V); sinks current when enabled

Key Features

Feature	Design Value
Integrated bias resistors	Eliminates two external components; reduces PCB real estate and assembly cost in high-volume consumer controls
Lead-free / RoHS-compliant plating	Matte tin finish over Alloy 42 leadframe meets IPC-J-STD-020 and JEDEC Level 1 reflow requirements
Green molding compound	Halogen-free, antimony-free encapsulant compliant with Diodes Inc.'s "Green" policy since Date Code 0627
Low V_CE(sat) at rated current	Ensures <150 mW conduction loss at −5 mA, critical for battery-powered sensor nodes and portable displays

Applications

Microcontroller GPIO Interface

LED Driver Enable Switch

Use Scenario: Driving active-low enable inputs on 3.3 V microcontrollers interfacing with −5 V peripheral ICs.

IC Role / Device Role / Timing Role: Level-shifting digital switch that inverts and translates logic states while providing current gain.

Use Value: Eliminates discrete base resistor and pull-up network, reducing component count by two and enabling 0.65 mm pitch routing.

Use Scenario: Enabling high-brightness red/green LEDs in automotive interior lighting modules powered from −12 V rail.

IC Role / Device Role / Timing Role: Low-side sink switch controlling LED anode current via common-cathode configuration.

Use Value: −0.3 V V_CE(sat) limits power dissipation to <1.5 mW per LED channel, avoiding thermal derating at ambient up to +85 °C.

Industrial Sensor Signal Conditioning

Power Supply Sequencing Control

Use Scenario: Isolating fault signals from −24 V field sensors to 5 V PLC input cards using optocoupler-compatible drive.

IC Role / Device Role / Timing Role: Digital buffer stage converting open-collector sensor outputs into clean CMOS-compatible logic levels.

Use Value: Guaranteed −2.0 V V_I(on) ensures reliable turn-on even with 10 % supply tolerance on −24 V rail.

Use Scenario: Controlling power-up sequence of dual-rail FPGA core/I/O supplies by enabling −1.8 V LDO only after −3.3 V rail stabilizes.

IC Role / Device Role / Timing Role: Delayed-enable switch triggered by power-good signal from upstream regulator.

Use Value: Integrated R1/R2 provides predictable turn-on delay (~50 ns) without RC network drift over temperature.

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
DDTA122TU-7-F	No R2 resistor (open); only R1 = 220 Ω present; higher h_FE (100–600) but no collector-base bias path	Requires external pull-up on base for defined off-state; less robust against floating input conditions	Select when base drive is actively controlled and leakage immunity is secondary to gain stability
NSV12200MT1G	PNP pre-biased, R1 = 220 Ω, R2 = 10 kΩ, but in SOT-723 package (smaller footprint, 0.4 mm pitch)	Higher thermal resistance (R_θJA = 750 °C/W); not suitable for >60 mW continuous dissipation	Select for ultra-compact layouts where board space savings outweigh thermal margin reduction

Compared with DDTA122LU-7, DDTA122TU-7-F lacks R2 and requires external biasing for noise immunity, while NSV12200MT1G offers identical resistor values in a smaller package but with reduced thermal performance-making DDTA122LU-7 optimal for designs prioritizing robustness and manufacturability over minimal footprint.

Availability

DDTA122LU-7 is available at Aetrix Electronics and suitable for microcontroller interface, LED driver enable, industrial sensor conditioning, and power supply sequencing applications requiring stable component supply and long-term obsolescence management support.

Supply support for DDTA122LU-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.

The DDTA series belongs to Diodes' pre-biased transistor product line, engineered specifically for replacing discrete BJT + resistor combinations in digital logic interfacing, level translation, and low-power switching applications where space, reliability, and assembly efficiency are critical.

FAQ

Is DDTA122LU-7 still in active production?

No-DDTA122LU-7 is officially marked obsolete per Diodes Incorporated's DS30402 Rev. 7 (June 2021). However, Aetrix Electronics maintains legacy inventory and offers extended lifecycle support, including last-time buy planning, cross-reference engineering, and qualified second-source alternatives for ongoing production.

What is the maximum continuous collector current for DDTA122LU-7?

The absolute maximum continuous collector current is −100 mA per the datasheet's "Maximum Ratings" table. However, at this current, V_CE(sat) rises significantly and power dissipation exceeds 200 mW unless heatsinking is applied. For reliable operation without derating, limit I_C to ≤ −50 mA at T_A = 25 °C on standard FR4.

Can DDTA122LU-7 be used in place of a standard PNP BJT like BC807?

Yes-but only if the circuit relies on the integrated 220 Ω/10 kΩ bias network. Unlike BC807, DDTA122LU-7 cannot operate without those resistors. Substitution requires removing external base resistors and verifying that the resulting bias point matches required I_B/I_C ratios and switching thresholds.

Does DDTA122LU-7 meet AEC-Q101 for automotive use?

No-DDTA122LU-7 is not AEC-Q101 qualified. While its operating temperature range (−55 °C to +150 °C) overlaps with automotive requirements, it lacks stress test validation (e.g., HTGB, AC-H3TRB, ESD) and qualification documentation required for automotive-grade deployment. Use only in industrial or consumer applications unless independently qualified.

DDTA122LU-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:: -

DDTA122LU-7 FAQ

1.How can I place an order for DDTA122LU-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTA122LU-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 DDTA122LU-7 reliable?

The price and inventory of DDTA122LU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA122LU-7 is usually 5 days.

3.What payment methods are accepted for DDTA122LU-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA122LU-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTA122LU-7?

DDTA122LU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTA122LU-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 DDTA122LU-7?

For technical support, including DDTA122LU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA122LU-7 requirements.

6.How does Aetrix verify that DDTA122LU-7 is sourced from the original manufacturer or authorized distributors?

All DDTA122LU-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 DDTA122LU-7 meets industry standards.

7.What is the process for return or replacement of DDTA122LU-7?

All DDTA122LU-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA122LU-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 DDTA122LU-7 part is unused and in its original packaging.

Return procedure for DDTA122LU-7:

1.Submit a request within 90 days.

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

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