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

Diodes Incorporated DDTA122LE-7

Name: DDTA122LE-7
Brand: Diodes Incorporated
SKU: DDTA122LE-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTA122LE-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTA122LE-7.pdf

Description:: TRANS PREBIAS PNP 150MW SOT523

Quantity:: RFQ Add To RFQ list

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Inventory:4,397

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Product details

Overview

DDTA122LE-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT-523 package, featuring integrated 22 kΩ and 10 kΩ bias resistors (R1/R2), −50 V V_CBO, −40 V V_CEO, and −100 mA I_C rating, used for compact logic-level switching in space-constrained DC-DC feedback and LED driver control circuits.

For engineers reviewing the DDTA122LE-7 datasheet, DDTA122LE-7 pinout, DDTA122LE-7 application, or DDTA122LE-7 equivalent, key selection criteria include verified V_CE(sat) ≤ −0.3 V at −5 mA/−0.25 mA, guaranteed h_FE ≥ 56 for R1/R2 types, and thermal resistance R_JA = 625 °C/W on FR4 with recommended pad layout.

Technical Context

This device integrates base-emitter and base-collector bias resistors (R1 = 22 kΩ, R2 = 10 kΩ) to eliminate external components in saturated-switch configurations. It operates as a single-polarity digital switch with defined turn-on threshold (V_IN(on) = −2.0 V) and cutoff behavior (V_IN(off) = −0.3 V) under −5 V supply.

Its epitaxial planar die construction ensures stable gain-bandwidth product (f_T = 200 MHz) and low leakage (I_CBO ≤ −0.5 µA), supporting reliable operation from −55 °C to +150 °C in thermally demanding embedded power management nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−50 V - maximum reverse voltage between collector and base before breakdown
V_CEO	−40 V - maximum collector-emitter voltage under open-base condition
I_C	−100 mA - continuous collector current rating for sustained switching duty
V_CE(sat)	−0.3 V @ −5 mA/−0.25 mA - low saturation voltage enabling <0.15 mW conduction loss
R1 / R2	22 kΩ / 10 kΩ - factory-trimmed internal bias network eliminating two external resistors
P_D	150 mW - max power dissipation on standard FR4 PCB with specified pad layout
f_T	200 MHz - usable bandwidth for high-speed digital switching up to ~10 MHz edge rates

Pinout & Package

SOT-523 surface-mount package: ultra-compact 1.6 mm × 0.8 mm footprint, 0.5 mm pitch, matte tin-plated terminals, JEDEC-compliant leadframe, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for bias network; connects to system ground or low-side return path
2 (Base)	Input control node	Internal connection point of R1–R2 junction; accepts logic-level input signal
3 (Collector)	Output switching node	High-side load connection; sinks current when transistor is saturated

Key Features

Feature	Design Value
Integrated R1/R2 bias network	22 kΩ + 10 kΩ resistor pair eliminates external bias components and layout area
Guaranteed h_FE ≥ 56	Ensures consistent saturation across production lots without gain binning
Low V_CE(sat) (−0.3 V)	Minimizes power loss and self-heating in battery-powered or thermally constrained designs
−55 °C to +150 °C operating range	Validated performance across automotive under-hood and industrial motor-control ambient conditions

Applications

DC-DC Converter Feedback

LED Driver Switching

Use Scenario: Isolates optocoupler output in isolated flyback converter feedback loop.

IC Role / Device Role / Timing Role: PNP switch translating error amplifier output into opto-LED drive current.

Use Value: Integrated R1/R2 enables direct interface with TL431 without external resistors, reducing BOM count by 2 parts.

Use Scenario: Controls anode-side current path for multi-segment indicator LEDs in portable instrumentation.

IC Role / Device Role / Timing Role: Low-side saturated switch sinking LED current from common-anode array.

Use Value: −0.3 V V_CE(sat) limits voltage drop to <3% of 3.3 V rail, preserving headroom for precise current regulation.

Microcontroller GPIO Interface

Power Sequencing Control

Use Scenario: Inverts and amplifies 1.8 V/3.3 V MCU GPIO output to drive −5 V logic rails or relays.

IC Role / Device Role / Timing Role: Level-shifting digital buffer with built-in pull-up configuration.

Use Value: Verified V_IN(on) = −2.0 V ensures clean turn-on with 3.3 V GPIO driving through simple series resistor.

Use Scenario: Enables/disables auxiliary power rails in FPGA or ASIC power sequencing networks.

IC Role / Device Role / Timing Role: High-voltage enable switch controlling PMIC EN pin or LDO input.

Use Value: −50 V V_CBO rating supports safe operation across −48 V telecom or −24 V industrial supply domains.

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
DDTA142JE-7	R1 = 47 kΩ, R2 = 10 kΩ; higher input impedance, lower base current (−13 mA vs −28 mA at −5 V)	Better suited for high-impedance microcontroller outputs or battery-sensitive systems	Select when drive source cannot sink >20 mA or when reduced base loading is required
DDTC122LE-7	NPN complement; same R1/R2 values but opposite polarity; V_CBO = +50 V, V_CEO = +40 V	Used where low-side switching or positive-rail referenced logic is preferred	Choose for NPN-compatible circuit topology or dual-polarity bias network symmetry

Compared with DDTA142JE-7 and DDTC122LE-7, DDTA122LE-7 offers optimal base drive efficiency for moderate-current PNP switching with tighter V_CE(sat) consistency, making it preferred for cost-sensitive, space-constrained DC-DC and LED control where −28 mA base current is acceptable.

Availability

DDTA122LE-7 is available at Aetrix Electronics and suitable for DC-DC converter feedback, LED driver switching, and microcontroller GPIO interface requiring stable component supply and long-term production continuity.

Supply support for DDTA122LE-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, high-volume power management and signal integrity solutions.

The DDTA/DDTC pre-biased transistor family targets space- and cost-sensitive digital switching applications, delivering validated performance in consumer, industrial, and automotive power subsystems.

FAQ

What is the pin configuration of DDTA122LE-7?

DDTA122LE-7 uses SOT-523 package with pin 1 = Emitter, pin 2 = Base (R1–R2 junction), pin 3 = Collector. This matches JEDEC-standard SOT-523 orientation and is confirmed in Diodes' DS30405 Rev. 5 schematic diagram and mechanical drawings.

Does DDTA122LE-7 require external bias resistors?

No. DDTA122LE-7 integrates 22 kΩ (R1) and 10 kΩ (R2) bias resistors internally. The datasheet explicitly states "Built-In Biasing Resistors" and shows no external resistor requirement in the typical application schematic on page 1.

What is the maximum operating temperature for DDTA122LE-7?

The device is rated for junction and storage temperatures from −55 °C to +150 °C, as specified in the "Operating and Storage Temperature Range" table of DS30405 Rev. 5, with thermal resistance R_JA = 625 °C/W on FR4 board per AP02001 layout guidelines.

How does DDTA122LE-7 differ from DDTA122TE-7?

DDTA122LE-7 includes both R1 and R2 bias resistors (22 kΩ/10 kΩ); DDTA122TE-7 has only R1 (22 kΩ) and an open R2. This makes DDTA122LE-7 suitable for standard grounded-emitter switches, while DDTA122TE-7 supports emitter-follower or adjustable bias configurations.

DDTA122LE-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:: -

DDTA122LE-7 FAQ

1.How can I place an order for DDTA122LE-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTA122LE-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 DDTA122LE-7 reliable?

The price and inventory of DDTA122LE-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA122LE-7 is usually 5 days.

3.What payment methods are accepted for DDTA122LE-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA122LE-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTA122LE-7?

DDTA122LE-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTA122LE-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 DDTA122LE-7?

For technical support, including DDTA122LE-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA122LE-7 requirements.

6.How does Aetrix verify that DDTA122LE-7 is sourced from the original manufacturer or authorized distributors?

All DDTA122LE-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 DDTA122LE-7 meets industry standards.

7.What is the process for return or replacement of DDTA122LE-7?

All DDTA122LE-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA122LE-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 DDTA122LE-7 part is unused and in its original packaging.

Return procedure for DDTA122LE-7:

1.Submit a request within 90 days.

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

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