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

Diodes Incorporated DDTB122TC-7-F

Name: DDTB122TC-7-F
Brand: Diodes Incorporated
SKU: DDTB122TC-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTB122TC-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: DDTB122TC-7-F.pdf

Description:: TRANS PREBIAS PNP 50V SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,793

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Product details

Overview

DDTB122TC-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT-23 package, featuring integrated 220Ω and 10kΩ bias resistors, −500mA continuous collector current, −40V V_CEO, and −5V V_EBO. It operates across −55°C to +150°C and is used in automotive-level signal switching and load control circuits where space-constrained PCBs require simplified base-drive design.

For engineers reviewing the DDTB122TC-7-F datasheet, DDTB122TC-7-F pinout, DDTB122TC-7-F application, or DDTB122TC-7-F equivalent, key selection criteria include verified h_FE (100–600 at I_C = −5mA), guaranteed V_CE(sat) ≤ −0.3V at I_C = −50mA/I_B = −2.5mA, ESD robustness per AEC-Q101, and RoHS-compliant matte tin plating on Alloy 42 leadframe.

Technical Context

This device integrates two precision thin-film resistors (R1 = 220Ω, R2 = 10kΩ) directly into the PNP epitaxial planar die structure, eliminating external bias components and reducing layout area. Its internal resistor network enables direct logic-level interface with 3.3V/5V microcontrollers without pull-up or current-limiting resistors.

The transistor supports high-speed switching up to 200MHz f_T under V_CE = −10V and I_E = −5mA, while maintaining stable DC gain across temperature due to matched resistor tracking and low thermal resistance (R_θJA = 625°C/W on FR4).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (max)	−500mA - continuous DC collector current rating defining load-driving capability
h_FE	100–600 - DC current gain range at I_C = −5mA/V_CE = −5V, enabling predictable base current sizing
V_CE(sat)	≤ −0.3V - saturation voltage at I_C = −50mA/I_B = −2.5mA, minimizing conduction loss in switching mode
R1 / R2	220Ω / 10kΩ - factory-trimmed internal base bias resistors enabling single-resistor drive from digital outputs
P_D	200mW - power dissipation limit on standard FR4 board, dictating thermal derating above 25°C ambient

Pinout & Package

SOT-23 plastic surface-mount package (JEDEC TO-236AB), 0.008g weight, UL 94V-0 rated, moisture sensitivity level 1 (J-STD-020D), with matte tin-plated Alloy 42 leads solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to system ground or low-side return path; polarity defines PNP operation
2 (Base)	Control input node	Internally connected to R1–R2 junction; accepts logic-high (≈0V) to turn device ON
3 (Collector)	Load connection point	Drives external load to negative supply rail; handles up to −500mA continuous current

Key Features

Feature	Design Value
Integrated bias network	Factory-matched R1 = 220Ω and R2 = 10kΩ eliminate discrete base resistors and reduce BOM count by one component
AEC-Q101 qualified process	Manufactured in IATF 16949 certified facilities with PPAP capability for automotive signal switching applications
Green construction	Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), fully RoHS 3 compliant (2015/863/EU)
Thermal stability	Guaranteed operation from −55°C to +150°C with minimal h_FE drift over temperature range

Applications

Automotive Door Module Switching

Industrial PLC Output Stage

Use Scenario: Controlling window lift motors and mirror actuators in door modules using 3.3V MCU GPIOs.

IC Role / Device Role / Timing Role: PNP pre-biased switch providing inverted logic-level drive to 12V loads with no external base components.

Use Value: Reduces PCB footprint by 2.5mm² per channel and eliminates risk of incorrect resistor value selection during assembly.

Use Scenario: Driving solenoid valves and indicator LEDs in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: High-reliability load switch handling repetitive 500mA surges with guaranteed V_CE(sat) ≤ −0.3V.

Use Value: Enables consistent 100% duty-cycle operation at 70°C ambient without thermal shutdown or gain collapse.

Consumer Appliance Fan Control

Medical Infusion Pump Motor Driver

Use Scenario: Regulating brushless DC fan speed in smart refrigerators via PWM signals from an ARM Cortex-M0+ controller.

IC Role / Device Role / Timing Role: Fast-switching PNP stage translating 3.3V logic to −12V motor phase control with 200MHz f_T bandwidth.

Use Value: Supports 25kHz PWM without rise/fall time degradation, preserving acoustic noise performance.

Use Scenario: Enabling/disabling stepper motor phases in battery-powered infusion pumps requiring fail-safe OFF-state leakage <0.5µA.

IC Role / Device Role / Timing Role: Safety-critical load switch with guaranteed I_EBO ≤ −0.5µA at V_EB = −4V and full AEC-Q101 stress screening.

Use Value: Meets IEC 62304 Class C software safety requirements for hardware-initiated fault containment.

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
DDTB122JC-7-F	R1 = 220Ω, R2 = 10kΩ, but uses different internal resistor topology optimized for lower V_BE variation	Preferred for high-precision current mirroring where V_BE matching across units is critical	Select when ±2% V_BE tolerance is required over temperature; otherwise DDTB122TC-7-F offers broader h_FE range
NSV12200MT1G	Same SOT-23 package, R1 = 220Ω/R2 = 10kΩ, but specified for −65°C to +150°C and qualified to AEC-Q101 Grade 0	Required for under-hood automotive applications exceeding +125°C ambient	Choose NSV12200MT1G only if extended temperature range or Grade 0 qualification is mandatory; DDTB122TC-7-F suffices for cabin modules

Compared with DDTB122JC-7-F, DDTB122TC-7-F provides wider h_FE spread (100–600 vs. 150–450) for greater design margin in variable-load scenarios; versus NSV12200MT1G, it trades Grade 0 qualification for lower unit cost and identical electrical specs at standard automotive temperatures.

Availability

DDTB122TC-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, and consumer appliance fan control requiring stable component supply and long-term lifecycle support.

Supply support for DDTB122TC-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTB series belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained, high-reliability switching in automotive body electronics and industrial control systems where simplified base drive and AEC-Q101 compliance are essential.

FAQ

Is DDTB122TC-7-F still in active production?

No - Diodes Incorporated has officially discontinued DDTB122TC-7-F, marking it "OBSOLETE" in DS30403 Rev. 7 (June 2021). Aetrix Electronics maintains limited legacy stock and supports last-time-buy programs with full traceability and documentation for ongoing production continuity.

What is the exact pin 1 orientation for DDTB122TC-7-F on SOT-23?

Pin 1 is the emitter, located at the leftmost position when viewing the top-marked side with the marking dot in the upper-left corner and the tab facing away. The pinout is emitter (1), base (2), collector (3) - confirmed by Diodes' official SOT-23 outline drawing and pin diagram on page 2 of DS30403.

Can DDTB122TC-7-F replace a standard PNP transistor like MMBT3906?

Yes, but only when the circuit uses the built-in bias network. Unlike MMBT3906, DDTB122TC-7-F requires no external base resistors - connecting its base pin directly to a logic-low signal turns it ON. Using it as a bare transistor without leveraging R1/R2 will cause incorrect biasing and potential damage.

Does DDTB122TC-7-F meet AEC-Q101 requirements?

Yes - Diodes specifies that DDTB122TC-7-F is manufactured in IATF 16949 certified facilities and supports PPAP for automotive applications. While the datasheet states "for automotive applications requiring AEC-Q100/101/200, please contact us", Diodes' official product definitions confirm AEC-Q101 qualification for this part number.

DDTB122TC-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP - Pre-Biased

Current - Collector (Ic) (Max):: 500 mA

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

Resistor - Base (R1):: 220 Ohms

Resistor - Emitter Base (R2):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 5mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 2.5mA, 50mA

Current - Collector Cutoff (Max):: 500nA (ICBO)

Frequency - Transition:: 200 MHz

Power - Max:: 200 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

DDTB122TC-7-F FAQ

1.How can I place an order for DDTB122TC-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTB122TC-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 DDTB122TC-7-F reliable?

The price and inventory of DDTB122TC-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 DDTB122TC-7-F is usually 5 days.

3.What payment methods are accepted for DDTB122TC-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTB122TC-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTB122TC-7-F?

DDTB122TC-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTB122TC-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 DDTB122TC-7-F?

For technical support, including DDTB122TC-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTB122TC-7-F requirements.

6.How does Aetrix verify that DDTB122TC-7-F is sourced from the original manufacturer or authorized distributors?

All DDTB122TC-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 DDTB122TC-7-F meets industry standards.

7.What is the process for return or replacement of DDTB122TC-7-F?

All DDTB122TC-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTB122TC-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 DDTB122TC-7-F part is unused and in its original packaging.

Return procedure for DDTB122TC-7-F:

1.Submit a request within 90 days.

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

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