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Diodes Incorporated DDTB122LC-7
- Part No.:
- DDTB122LC-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTB122LC-7.pdf
- Description:
- TRANS PREBIAS PNP 50V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,476
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Product details
Overview
DDTB122LC-7 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, −0.3 V VCE(sat) at −50 mA/−2.5 mA, and −40 V BVCEO. It serves as an automotive-grade switching element in low-side load control circuits requiring fast turn-off and minimal external components.
For engineers reviewing the DDTB122LC-7 datasheet, DDTB122LC-7 pinout, DDTB122LC-7 application, or DDTB122LC-7 equivalent, key selection criteria include verified VCE(sat) at high IC, guaranteed hFE range (100–600), R1/R2 resistor tolerance, thermal derating behavior above +25°C, and AEC-Q101 qualification status for automotive use cases.
Technical Context
This device integrates two precision bias resistors (R1 = 220 Ω, R2 = 10 kΩ) directly on-die to configure base drive for predictable PNP switching without external components. Its epitaxial planar construction ensures stable DC current gain (hFE = 100–600) across −55°C to +150°C operating range.
The transistor operates with VIN from +5 V to −6 V and supports output current up to −500 mA under pulsed conditions. Saturation voltage remains ≤ −0.3 V at IC = −50 mA and IB = −2.5 mA, enabling efficient low-voltage logic-level interfacing in 3.3 V/5 V systems.
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 DC collector current capability with appropriate PCB thermal relief |
| VCE(sat) | −0.3 V @ IC/IB = −50 mA/−2.5 mA: Low saturation voltage minimizes power loss in switching applications |
| hFE | 100–600 @ IC = −5 mA, VCE = −5 V: Guaranteed DC current gain range for reliable biasing design |
| R1/R2 | 220 Ω / 10 kΩ: Integrated base resistors enable single-pin logic control without external components |
| PD | 200 mW @ TA = +25°C: Power dissipation limit on FR4 board with recommended pad layout |
| TJ Range | −55°C to +150°C: Full operational junction temperature range compliant with automotive ambient requirements |
Pinout & Package
Package: SOT-23 - surface-mount plastic case, UL 94V-0 rated, moisture sensitivity level 1, 0.008 g weight, lead-free matte tin plating over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Connected to system ground or low-side return path; carries full load current |
| 2 (Base) | Input control node | Internally connected to R1 and R2; accepts logic-level input to enable/disable conduction |
| 3 (Collector) | Output switch node | Connected to load and supply rail; sinks current when active |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias network | On-die R1 = 220 Ω and R2 = 10 kΩ eliminate need for external base resistors in standard switching configurations |
| Automotive qualification readiness | Manufactured in IATF 16949 certified facilities; supports PPAP documentation upon request for AEC-Q101-compliant designs |
| Green process compliance | Halogen- and antimony-free (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb); fully RoHS 3 compliant |
| Thermal robustness | RθJA = 625°C/W enables operation up to +150°C junction temperature with standard FR4 layout |
Applications
| Automotive Body Control Module | Industrial PLC Output Stage |
|---|---|
Use Scenario: Driving solenoids and relays in door lock/unlock, mirror fold/unfold, and seat position control circuits. IC Role / Device Role / Timing Role: Low-side PNP switch providing controlled current sink for 12 V loads with logic-compatible input. Use Value: −0.3 V VCE(sat) reduces heat generation during sustained actuation; integrated bias resistors simplify PCB layout and reduce BOM count. | Use Scenario: Isolating microcontroller GPIO pins from 24 V industrial sensors and actuators in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Logic-level compatible interface transistor enabling direct MCU-to-load connection without level-shifting circuitry. Use Value: Guaranteed hFE ≥ 100 ensures reliable saturation even with marginal base drive; −40 V BVCEO withstands inductive kickback from solenoid loads. |
| Consumer Appliance Motor Driver | LED Lighting Dimming Circuit |
Use Scenario: Controlling small DC brush motors in washing machine pumps, HVAC blowers, and coffee maker grinders. IC Role / Device Role / Timing Role: High-current PNP switch activated by PWM signal to regulate motor speed via duty-cycle modulation. Use Value: −500 mA IC rating supports typical appliance motor stall currents; thermal derating curve allows sustained operation at elevated ambient temperatures. | Use Scenario: Enabling/disabling LED strings in smart lighting modules using microcontroller outputs. IC Role / Device Role / Timing Role: Constant-current switch controlling LED anode connection to regulated supply rail. Use Value: Precise R1/R2 values ensure consistent turn-on threshold across production lots; low VCE(sat) preserves forward voltage margin for LED string design. |
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 | No R1 resistor (open); only R2 = 10 kΩ present; higher hFE (100–600) but no guaranteed VCE(sat) at −50 mA | Suitable for lower-current biasing where precise saturation voltage is not required | Select when base current limiting is handled externally and higher DC gain is prioritized over fixed R1 stability |
| NSV12200MT1G | PNP pre-biased with R1 = 220 Ω, R2 = 10 kΩ; same SOT-23 package; −500 mA IC; −0.3 V VCE(sat) confirmed at −100 mA | Qualified to AEC-Q101 Grade 1; includes enhanced ESD protection (HBM 8 kV) | Preferred for new automotive designs requiring formal AEC-Q101 certification and higher ESD immunity |
Compared with DDTB122LC-7, DDTB122TC-7-F offers greater hFE flexibility but lacks integrated R1, while NSV12200MT1G matches electrical specs and adds AEC-Q101 qualification and superior ESD robustness-making it suitable for safety-critical automotive nodes where DDTB122LC-7's discontinued status requires replacement.
Availability
DDTB122LC-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output stages, consumer appliance motor control, and LED lighting dimming applications requiring stable component supply and legacy design continuity.
Supply support for DDTB122LC-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 DDTB series belongs to Diodes' pre-biased transistor product line, designed specifically for space-constrained, high-reliability switching applications in automotive, industrial, and consumer systems where simplified base drive and consistent gain are critical.
FAQ
Is DDTB122LC-7 still in active production?
No. The datasheet explicitly states "OBSOLETE – PART DISCONTINUED" and "OBSOLETE – CONTACT US". Diodes Incorporated has discontinued this part; Aetrix Electronics maintains limited legacy stock for design continuity and last-time buy support, but no future production is planned.
What is the exact pin configuration for DDTB122LC-7 in SOT-23?
Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector - confirmed by the official schematic and top-view diagram in DS30403 Rev. 7-4. This matches standard SOT-23 PNP transistor orientation and is validated against Diodes' package outline document PN-001.
Does DDTB122LC-7 meet AEC-Q101 requirements?
The datasheet does not list AEC-Q101 qualification. It states that automotive-grade parts "requiring specific change control (i.e., parts qualified to AEC-Q100/101/200)" must be requested separately. DDTB122LC-7 is not pre-qualified; however, it is manufactured in IATF 16949-certified facilities and supports PPAP documentation upon request.
Can DDTB122LC-7 replace a standard PNP transistor like MMBT3906?
Yes, with design validation. DDTB122LC-7 integrates R1 and R2, so it replaces both the transistor and its two base resistors. Unlike MMBT3906, it requires no external biasing; however, its fixed R1/R2 values mean switching thresholds and gain are predetermined - verify VIN compatibility and load current requirements before substitution.
DDTB122LC-7 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:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for DDTB122LC-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTB122LC-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 DDTB122LC-7 reliable?
The price and inventory of DDTB122LC-7 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 is usually 5 days.
3.What payment methods are accepted for DDTB122LC-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTB122LC-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTB122LC-7?
DDTB122LC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTB122LC-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 DDTB122LC-7?
For technical support, including DDTB122LC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTB122LC-7 requirements.
6.How does Aetrix verify that DDTB122LC-7 is sourced from the original manufacturer or authorized distributors?
All DDTB122LC-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 DDTB122LC-7 meets industry standards.
7.What is the process for return or replacement of DDTB122LC-7?
All DDTB122LC-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTB122LC-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 DDTB122LC-7 part is unused and in its original packaging.
Return procedure for DDTB122LC-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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