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Diodes Incorporated DDTC122LU-7
- Part No.:
- DDTC122LU-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- -
- Datasheet:
-
DDTC122LU-7.pdf
- Description:
- TRANS PREBIAS NPN 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
DDTC122LU-7 from Diodes Incorporated is an NPN pre-biased digital transistor in SOT-323 package, featuring integrated 220 Ω and 10 kΩ bias resistors (R1/R2), 100 mA output current capability, 50 V VCEO, and 200 MHz fT. It functions as a single-stage logic-level switch in low-power interface circuits, commonly used in LED driver control and microcontroller I/O buffering.
For engineers reviewing the DDTC122LU-7 datasheet, DDTC122LU-7 pinout, DDTC122LU-7 application, or DDTC122LU-7 equivalent, key selection criteria include input voltage thresholds (VIN(OFF) = 0.3 V, VIN(ON) = 2.0 V), saturation voltage (VCE(sat) ≤ 0.3 V at 5 mA/0.25 mA), DC current gain (hFE = 56 typ), thermal resistance (RθJA = 625 °C/W), and RoHS-compliant green packaging.
Technical Context
This device integrates base-emitter and base-collector biasing resistors to eliminate external components in simple switching applications. Its epitaxial planar construction ensures stable gain and low leakage across -55°C to +150°C operating range.
The transistor operates with defined logic-compatible input thresholds and delivers predictable saturation behavior under 5 mA collector load with 0.25 mA base drive. Its 200 MHz fT supports moderate-speed digital switching but is not intended for RF amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum allowable collector-emitter voltage before breakdown; sets upper rail limit for 3.3 V/5 V logic interfacing |
| IC(max) | 100 mA - Continuous collector current rating; supports driving small LEDs or logic gates directly |
| VCE(sat) | ≤ 0.3 V @ IC/IB = 5 mA/0.25 mA - Ensures minimal power loss and voltage drop in saturated switch mode |
| hFE | 56 typ - Confirmed DC current gain at 1 mA IC, 5 V VCE; enables reliable bias network design |
| fT | 200 MHz - Gain-bandwidth product; validates suitability for <10 MHz digital signal switching |
| RθJA | 625 °C/W - Thermal resistance on FR4 board; requires derating above 25°C ambient per Fig. 1 |
| PD | 200 mW - Max power dissipation at 25°C; limits continuous duty-cycle in high-current operation |
Pinout & Package
Package: SOT-323 - ultra-small surface-mount plastic package (2.0 × 1.25 × 0.95 mm), moisture sensitivity level 1, lead-free matte tin plating, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for bias network; connects to ground or low-side return path |
| 2 (Base) | Input node with internal R1/R2 | Accepts logic-level input; internal 220 Ω–10 kΩ resistor divider sets turn-on threshold |
| 3 (Collector) | Output node | Drives load between VCC and collector; sinks up to 100 mA when saturated |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias resistors | 220 Ω (R1) and 10 kΩ (R2) reduce BOM count and layout area in discrete switch designs |
| Green molding compound | Halogen- and antimony-free formulation (<900 ppm Br/Cl, <1000 ppm Sb) meets automotive and industrial environmental mandates |
| Low VCE(sat) | ≤0.3 V ensures <150 µW static loss at 5 mA, critical for battery-powered sensor nodes |
| AEC-Q101 readiness | Manufactured in IATF 16949-certified facilities; PPAP-capable upon request for automotive qualification |
| Moisture sensitivity Level 1 | No floor life limitation or bake requirement prior to reflow, simplifying SMT assembly planning |
Applications
| LED Driver Interface | Microcontroller I/O Buffer |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V GPIO pins without external resistors. IC Role / Device Role / Timing Role: Single-stage current-sinking switch with built-in base bias network. Use Value: Eliminates two external resistors per channel, reducing PCB area by ~1.5 mm² and assembly cost. | Use Scenario: Level-shifting and current boosting between 1.8 V FPGA outputs and 5 V peripheral enable lines. IC Role / Device Role / Timing Role: Logic-compatible digital translator with guaranteed turn-on at 2.0 V input. Use Value: Enables direct connection without pull-up resistors or level-shifter ICs, cutting BoM by one component. |
| Power Sequencing Control | Industrial Sensor Signal Conditioning |
Use Scenario: Enabling 12 V auxiliary rails only after main 5 V supply stabilizes. IC Role / Device Role / Timing Role: Delayed-enable switch controlled by supervisor IC output. Use Value: Provides clean power-up sequencing with <1 µA leakage in OFF state, preventing backfeed. | Use Scenario: Isolating analog sensor outputs from noisy digital subsystems using open-collector configuration. IC Role / Device Role / Timing Role: Active-low enable gate for op-amp power domains. Use Value: Delivers 0.3 V saturation voltage to minimize offset error in precision analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTC114YU-7-F | Higher R1 (10 kΩ), lower hFE (35 typ), same SOT-323 package | Better suited for higher-impedance logic inputs; reduced gain requires larger base drive | Select when interfacing with high-Z CMOS outputs where lower base current is preferred |
| NSVD122DXV6T1G | Same R1/R2 values, AEC-Q101 qualified, tighter VIN(OFF) spec (0.25 V max) | Approved for automotive under-hood use; validated for PPAP and extended temperature cycling | Choose for production automotive systems requiring formal qualification documentation |
Compared with DDTC122LU-7, DDTC114YU-7-F offers higher input impedance but lower gain, while NSVD122DXV6T1G provides identical electrical behavior with certified automotive reliability-making it suitable for safety-critical deployments where qualification traceability is mandatory.
Availability
DDTC122LU-7 is available at Aetrix Electronics and suitable for LED driver interfaces, microcontroller I/O buffering, power sequencing control, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management support.
Supply support for DDTC122LU-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 DDTC series belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained digital interface applications where simplified layout, consistent switching thresholds, and environmental compliance are primary design requirements.
FAQ
Is DDTC122LU-7 still in active production?
No-DDTC122LU-7 is officially obsolete per Diodes' DS30401 Rev. 7-4 (June 2021). Aetrix Electronics maintains legacy inventory and offers cross-reference support, including verified alternatives like NSVD122DXV6T1G and engineering guidance for redesign.
What is the exact pin configuration for DDTC122LU-7 in SOT-323?
Pin 1 is Emitter, Pin 2 is Base (with internal R1/R2), and Pin 3 is Collector-confirmed by the schematic diagram on page 2 of DS30401. The device uses standard SOT-323 orientation with marking dot adjacent to Pin 1.
Can DDTC122LU-7 replace a standard 2N3904 in logic switching applications?
Yes, but only with circuit modification: DDTC122LU-7 integrates base bias resistors, so external base resistors must be removed. Its VIN(ON) = 2.0 V and VCE(sat) ≤ 0.3 V provide more predictable turn-on than discrete 2N3904 + resistor combinations in 3.3 V systems.
Does DDTC122LU-7 meet AEC-Q101 requirements?
DDTC122LU-7 itself is not AEC-Q101 qualified, though it is manufactured in IATF 16949-certified facilities. For automotive applications, Diodes recommends NSVD122DXV6T1G-a functionally identical part with full AEC-Q101 qualification and PPAP documentation support.
DDTC122LU-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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:
- -
DDTC122LU-7 FAQ
1.How can I place an order for DDTC122LU-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC122LU-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 DDTC122LU-7 reliable?
The price and inventory of DDTC122LU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC122LU-7 is usually 5 days.
3.What payment methods are accepted for DDTC122LU-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC122LU-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC122LU-7?
DDTC122LU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC122LU-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 DDTC122LU-7?
For technical support, including DDTC122LU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC122LU-7 requirements.
6.How does Aetrix verify that DDTC122LU-7 is sourced from the original manufacturer or authorized distributors?
All DDTC122LU-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 DDTC122LU-7 meets industry standards.
7.What is the process for return or replacement of DDTC122LU-7?
All DDTC122LU-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC122LU-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 DDTC122LU-7 part is unused and in its original packaging.
Return procedure for DDTC122LU-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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