My Inquiry
My Account
Diodes Incorporated DDTD122LU-7
- Part No.:
- DDTD122LU-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
DDTD122LU-7.pdf
- Description:
- TRANS PREBIAS NPN 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DDTD122LU-7 from Diodes Incorporated is an NPN pre-biased transistor in SOT323 package, featuring integrated 0.22 kΩ and 10 kΩ bias resistors. It delivers VI(OFF) = 0.3 V, VI(ON) = 2.0 V, and IL = 28 mA at VI = 5 V, enabling direct logic-level interface with microcontrollers in low-power switching applications such as LED drivers and signal routing in portable electronics.
For engineers reviewing the DDTD122LU-7 datasheet, DDTD122LU-7 pinout, DDTD122LU-7 application, or DDTD122LU-7 equivalent, key selection criteria include input threshold voltage, output saturation voltage (VCE(sat) ≤ 0.3 V), built-in resistor ratio, thermal resistance (RθJA = 500 °C/W), and JEDEC-qualified reliability for high-reliability PCB designs.
Technical Context
This device integrates base-emitter and base-collector biasing resistors to eliminate external components, reducing board space and assembly cost. Its R1 = 0.22 kΩ / R2 = 10 kΩ configuration sets a fixed current gain of GL = 56 and supports logic-compatible input drive with VI(ON) ≤ 2.0 V at IO = 20 mA.
Designed for surface-mount automated assembly, it operates across –55 °C to +150 °C and meets JEDEC high-reliability standards. The SOT323 package provides 250 mW power dissipation on FR4 PCBs and features matte tin-plated leads compliant with MIL-STD-202, Method 208.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| R1 Bias Resistor | 0.22 kΩ - sets base current path for predictable turn-on behavior with standard logic outputs |
| R2 Bias Resistor | 10 kΩ - provides stable base-emitter shunt for noise immunity and guaranteed turn-off |
| VI(ON) | 2.0 V max - ensures reliable activation from 3.3 V or 5 V MCU GPIO without level-shifting |
| VCE(sat) | 0.3 V max at IC = 50 mA - minimizes conduction loss in load-switching and LED-driving circuits |
| GL (DC Current Gain) | 56 min - defines consistent switching gain independent of external resistor tolerances |
| fT | 200 MHz typ - supports fast digital switching up to ~10–20 MHz edge rates in pulse applications |
| PD | 250 mW - limits continuous current to ~500 mA with appropriate PCB copper area and ambient derating |
Pinout & Package
Package: SOT323 - ultra-small surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), moisture sensitivity level 1, UL 94V-0 rated, 0.006 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Common reference node for input and output paths; connects directly to ground or low-side return |
| 2 (Base) | Input control node | Internally connected to R1 and R2; accepts logic-level voltage to enable/disable transistor |
| 3 (Collector) | Output current sink | Drives loads (e.g., LEDs, relays) between VCC and collector; handles up to 500 mA pulsed |
Key Features
| Feature | Design Value |
|---|---|
| Built-in bias resistors | Eliminates two external resistors, reducing BOM count and layout area by >30% vs discrete BJT + R network |
| Logic-compatible input threshold | VI(ON) ≤ 2.0 V enables direct drive from 3.3 V MCUs without pull-up or level shifters |
| Low saturation voltage | VCE(sat) ≤ 0.3 V at 50 mA ensures <15 mW conduction loss per switch, critical for battery-powered systems |
| JEDEC-qualified reliability | Qualified to AEC-Q101-equivalent stress levels per JEDEC standards, supporting industrial and automotive-adjacent use |
| Green RoHS-compliant construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental compliance mandates |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU pins in handheld medical devices. IC Role / Device Role: Low-side switch that replaces discrete BJT + two resistors, simplifying layout and improving production yield. Use Value: Reduces component count by 3 parts per channel and maintains VCE(sat) ≤ 0.3 V to preserve battery runtime. | Use Scenario: Adding 8 additional digital outputs to an STM32-based PLC module using minimal PCB real estate. IC Role / Device Role: Pre-biased NPN switch enabling one-to-one GPIO expansion without external biasing networks. Use Value: Enables compact 8-channel driver array with matched turn-on thresholds and guaranteed turn-off via R2. |
| Load Switch for Sensors | Level-Shifter Interface |
Use Scenario: Power-gating 5 V analog sensors (e.g., temperature ICs) during MCU sleep modes in IoT nodes. IC Role / Device Role: High-side or low-side load switch controlled by 3.3 V wake-up signal. Use Value: Achieves <0.5 μA off-state leakage and <0.3 V drop at 50 mA, minimizing standby power and sensor accuracy drift. | Use Scenario: Interfacing 1.8 V FPGA I/O banks to 5 V peripheral logic in test equipment backplanes. IC Role / Device Role: Active-low level translator using emitter-follower or common-emitter configuration. Use Value: Provides rail-to-rail translation with 200 MHz fT, supporting clean 10–20 MHz clock/data edges without external timing compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar pre-biased NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTD142JU-7-F | R1 = 0.47 kΩ (vs 0.22 kΩ); IL = 13 mA @ 5 V (vs 28 mA) | Higher input impedance; better suited for weak-drive sources like op-amp outputs or high-Z logic | Select when lower base current demand is required or when driving from higher-impedance sources |
| NSVD122DXV6T1G | Same R1/R2 values; SOT-523 package (smaller footprint, higher thermal resistance) | Smaller board area but reduced power handling (150 mW vs 250 mW); not JEDEC-qualified | Choose only for space-constrained designs where thermal margin and qualification are secondary |
Compared with DDTD122LU-7, DDTD142JU-7-F offers higher input impedance for sensitive drive sources, while NSVD122DXV6T1G trades thermal performance and qualification for smaller size-neither is pin-compatible, and both require layout and thermal revalidation.
Availability
DDTD122LU-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, sensor load switching, and level-shifter interfaces requiring stable component supply and long-term design continuity.
Supply support for DDTD122LU-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 distribution operations across Asia, Europe, and North America.
The DDTD series belongs to Diodes' pre-biased transistor product line, engineered specifically for eliminating external bias resistors in digital switching applications-targeting space-constrained, high-volume consumer, industrial, and automotive-adjacent electronics.
FAQ
What is the maximum continuous collector current for DDTD122LU-7?
The absolute maximum rating specifies IC = 500 mA, but practical continuous operation is limited by thermal dissipation. With RθJA = 500 °C/W and PD = 250 mW on FR4, sustained current should be kept ≤50 mA at +25 °C ambient to maintain junction temperature below 150 °C. Derating is required above 25 °C.
Is DDTD122LU-7 qualified for automotive applications?
No-DDTD122LU-7 is not AEC-Q101 qualified. Diodes offers automotive-grade equivalents with Q-suffix markings (e.g., DDTD122LUQ-7) manufactured in IATF 16949-certified facilities and PPAP-capable. This part meets JEDEC high-reliability standards but lacks formal automotive qualification documentation.
Can DDTD122LU-7 replace a standard NPN transistor like BC847?
Yes, but only in switching applications where its fixed bias network matches the required base drive. Unlike BC847, it cannot be used in linear amplifier configurations due to internal resistors. Layout must account for SOT323 pinout (Emitter-Base-Collector), and no external base resistor is needed-this changes schematic topology and BOM.
What does the "-7" suffix indicate in DDTD122LU-7?
The "-7" denotes tape-and-reel packaging: 3,000 units per 7-inch reel with 8 mm tape width. It is distinct from "-7-F", which indicates the obsolete status flag per Diodes' ordering nomenclature. DDTD122LU-7 is the active orderable part number for this configuration.
DDTD122LU-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- NPN - 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-323
DDTD122LU-7 FAQ
1.How can I place an order for DDTD122LU-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTD122LU-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 DDTD122LU-7 reliable?
The price and inventory of DDTD122LU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTD122LU-7 is usually 5 days.
3.What payment methods are accepted for DDTD122LU-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTD122LU-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTD122LU-7?
DDTD122LU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTD122LU-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 DDTD122LU-7?
For technical support, including DDTD122LU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTD122LU-7 requirements.
6.How does Aetrix verify that DDTD122LU-7 is sourced from the original manufacturer or authorized distributors?
All DDTD122LU-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 DDTD122LU-7 meets industry standards.
7.What is the process for return or replacement of DDTD122LU-7?
All DDTD122LU-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTD122LU-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 DDTD122LU-7 part is unused and in its original packaging.
Return procedure for DDTD122LU-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDTD122LU-7 Tags
-
MUN5211T1G
onsemi
-
DTC043ZEBTL
Rohm Semiconductor
-
DTC114EKAT146
Rohm Semiconductor
-
DDTD113ZC-7-F
Diodes Incorporated
-
DRDNB16W-7
Diodes Incorporated
-
PDTC114ET,215
Nexperia USA Inc.
-
PDTC143ZT,215
Nexperia USA Inc.
-
PDTC143ET,215
Nexperia USA Inc.
-
PDTC143XT,215
Nexperia USA Inc.
-
MMUN2211LT1G
onsemi
-
PDTC144ET,215
Nexperia USA Inc.
-
PDTC124ET,215
Nexperia USA Inc.
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
