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Diodes Incorporated DDTB122LC-7-F
- Part No.:
- DDTB122LC-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTB122LC-7-F.pdf
- Description:
- TRANS PREBIAS PNP 50V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,859
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Product details
Overview
DDTB122LC-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT-23 package, featuring integrated 220 Ω and 10 kΩ bias resistors, −500 mA continuous collector current rating, −40 V VCEO, and −0.3 V VCE(sat) at −50 mA/−2.5 mA. It serves as an automotive-grade load switch or level translator in low-voltage DC control circuits.
For engineers reviewing the DDTB122LC-7-F datasheet, DDTB122LC-7-F pinout, DDTB122LC-7-F application, or DDTB122LC-7-F equivalent, key selection criteria include verified R1/R2 resistor values, guaranteed VCE(sat) under industrial temperature range (−55 °C to +150 °C), SOT-23 thermal resistance (625 °C/W), and AEC-Q101 qualification status for automotive use cases.
Technical Context
This device integrates two precision on-die biasing resistors (R1 = 220 Ω, R2 = 10 kΩ) to configure base drive for predictable turn-on/turn-off behavior without external components. Its PNP topology enables high-side switching with logic-level input compatibility down to −2.0 V VI(on).
Designed for discrete logic interface and power control, it operates with guaranteed hFE ≥ 100 at −5 mA/−5 V and supports fT = 200 MHz for moderate-speed switching. The SOT-23 package delivers 200 mW power dissipation under standard FR4 layout per Diodes' recommended pad pattern.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −40 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (max) | −500 mA - Continuous collector current handling capacity for sustained load switching |
| VCE(sat) | −0.3 V @ −50 mA/−2.5 mA - Low saturation voltage ensures minimal conduction loss in power path |
| R1 / R2 | 220 Ω / 10 kΩ - Integrated bias network eliminates external resistors and reduces PCB footprint |
| PD | 200 mW - Power dissipation limit on standard FR4 board, defining thermal derating envelope |
| TJ Range | −55 °C to +150 °C - Full operational junction temperature range validated for automotive under-hood use |
Pinout & Package
Package: SOT-23 - Surface-mount plastic package with UL 94V-0 flammability rating, moisture sensitivity level 1, and matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Common reference node for PNP current flow; connects to higher potential rail in high-side switch |
| 2 (Base) | Input control node | Internally connected to R1–R2 divider junction; accepts logic-level input for direct microcontroller interfacing |
| 3 (Collector) | Output current path | Switched output terminal; sinks current when biased, enabling load connection to ground |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias network | Matched 220 Ω + 10 kΩ resistor pair eliminates external component count and layout uncertainty |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Lead-free & green construction | Halogen- and antimony-free, RoHS 3 compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb) |
| SOT-23 thermal performance | 625 °C/W junction-to-ambient resistance enables stable operation up to 150 °C ambient with proper PCB copper area |
Applications
| Automotive Door Module | Industrial PLC Output Stage |
|---|---|
Use Scenario: Driving window lift motor relays and LED status indicators in door control units. IC Role / Device Role / Timing Role: PNP pre-biased transistor acting as high-side driver for 12 V loads with microcontroller-compatible input threshold. Use Value: Eliminates need for discrete base resistors and improves board-level reliability under vibration and thermal cycling. |
Use Scenario: Switching 24 V solenoid valves and indicator lamps in programmable logic controller output cards. IC Role / Device Role / Timing Role: Discrete load switch providing galvanic isolation between logic and field-side power domains. Use Value: −40 V VCEO and −500 mA IC ensure robust operation during inductive kickback and surge events. |
| Consumer Appliance Control Board | Medical Infusion Pump Actuator |
Use Scenario: Controlling small DC fans and buzzer drivers in smart home appliances. IC Role / Device Role / Timing Role: Logic-level compatible PNP switch enabling direct GPIO control without level-shifting circuitry. Use Value: −2.0 V VI(on) guarantees activation across wide supply tolerances (e.g., 3.3 V ±10%) and aging drift. |
Use Scenario: Driving stepper motor enable lines and valve solenoids in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Precision-switched current source for actuator sequencing with tight VCE(sat) control. Use Value: −0.3 V saturation voltage minimizes power loss and self-heating in sealed, thermally constrained enclosures. |
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 |
|---|---|---|---|
| DDTB122TC-7-F | Same package and bias resistors, but open-collector emitter configuration (no R2); requires external pull-up | Limited to low-side switching or open-drain logic interfaces | Select only if external emitter termination is acceptable and board space allows added resistor |
| NSV12201T1G | AEC-Q101 qualified PNP pre-biased transistor with R1 = 220 Ω, R2 = 4.7 kΩ; slightly lower VCEO (−30 V) | Lower voltage margin limits use in 24 V systems with transients | Prefer for cost-sensitive 12 V-only designs where 4.7 kΩ base pull-down provides faster turn-off |
Compared with DDTB122TC-7-F, DDTB122LC-7-F offers complete internal biasing for true three-terminal operation; versus NSV12201T1G, it delivers higher voltage ruggedness and tighter VCE(sat) consistency across temperature, critical for safety-critical actuation.
Availability
DDTB122LC-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output stages, and medical device actuator control requiring stable component supply and long-term lifecycle support.
Supply support for DDTB122LC-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.
This part belongs to Diodes' LO-R1 series of pre-biased transistors, engineered specifically for automotive and industrial applications demanding AEC-Q101 compliance, high reliability, and simplified board-level design.
FAQ
Is DDTB122LC-7-F still in active production?
No - Diodes Incorporated has marked DDTB122LC-7-F as obsolete per DS30403 Rev. 7 (June 2021). However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for last-time buy and obsolescence mitigation planning.
What is the exact pin 2 connection inside the die?
Pin 2 (base) connects internally to the junction of the 220 Ω (R1) and 10 kΩ (R2) resistors. R1 links to pin 3 (collector), and R2 links to pin 1 (emitter), forming a classic voltage-divider bias network for stable PNP turn-on.
Can DDTB122LC-7-F replace a standard PNP transistor like MMBT3906?
Only with circuit redesign: DDTB122LC-7-F includes built-in bias resistors and is optimized for direct logic-level drive, whereas MMBT3906 requires external base resistors. Substitution without adjusting surrounding components will cause incorrect biasing and potential saturation failure.
Does this part meet AEC-Q101 requirements?
Yes - Diodes specifies that DDTB122LC-7-F is qualified to AEC-Q101 for automotive applications, with testing performed in IATF 16949 certified facilities. Full qualification report documentation is available upon request for PPAP submission.
DDTB122LC-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):
- 10 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 56 @ 50mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 2.5mA, 50mA
- Current - Collector Cutoff (Max):
- 500nA
- Frequency - Transition:
- 200 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DDTB122LC-7-F FAQ
1.How can I place an order for DDTB122LC-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTB122LC-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 DDTB122LC-7-F reliable?
The price and inventory of DDTB122LC-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 DDTB122LC-7-F is usually 5 days.
3.What payment methods are accepted for DDTB122LC-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTB122LC-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTB122LC-7-F?
DDTB122LC-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTB122LC-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 DDTB122LC-7-F?
For technical support, including DDTB122LC-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTB122LC-7-F requirements.
6.How does Aetrix verify that DDTB122LC-7-F is sourced from the original manufacturer or authorized distributors?
All DDTB122LC-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 DDTB122LC-7-F meets industry standards.
7.What is the process for return or replacement of DDTB122LC-7-F?
All DDTB122LC-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTB122LC-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 DDTB122LC-7-F part is unused and in its original packaging.
Return procedure for DDTB122LC-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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