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Diodes Incorporated DDTC123TKA-7-F
- Part No.:
- DDTC123TKA-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTC123TKA-7-F.pdf
- Description:
- TRANS PREBIAS NPN 50V SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,713
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Product details
Overview
DDTC123TKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with built-in 2.2 kΩ base bias resistor (R1 only), SC-59 package, VCEO = 50 V, IC(max) = 100 mA, and hFE = 100–600 at IC = 1 mA. It enables simplified switching in low-power digital interface circuits such as microcontroller GPIO drivers.
For engineers reviewing the DDTC123TKA-7-F datasheet, DDTC123TKA-7-F pinout, DDTC123TKA-7-F application, or DDTC123TKA-7-F equivalent, key selection criteria include verified R1-only biasing topology, SC-59 thermal performance (RθJA = 625 °C/W), guaranteed VCE(sat) ≤ 0.3 V at IC/IB = 5 mA/0.5 mA, and RoHS-compliant matte tin plating.
Technical Context
This device integrates a single NPN silicon epitaxial planar transistor with a monolithic 2.2 kΩ base resistor (R1), eliminating external bias components. It operates as a saturated switch under DC conditions with fixed current gain control via internal resistor ratio.
The SC-59 package supports surface-mount assembly on FR4 PCBs using standard reflow profiles, with moisture sensitivity level 1 and UL 94V-0 flammability rating. Thermal derating begins above 25°C ambient per the published power dissipation curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum collector-emitter voltage before breakdown; defines safe switching range for 3.3 V/5 V logic-level loads. |
| IC(max) | 100 mA - Continuous collector current limit; suitable for driving LEDs, relays, or small MOSFET gates. |
| hFE | 100–600 - DC current gain at IC = 1 mA, VCE = 5 V; ensures reliable saturation with low base drive. |
| VCE(sat) | ≤ 0.3 V at IC/IB = 5 mA/0.5 mA - Confirmed saturation voltage; minimizes conduction loss in switching applications. |
| R1 | 2.2 kΩ ±30% - Integrated base bias resistor; eliminates need for external resistor and reduces BOM count. |
| PD | 200 mW - Maximum power dissipation at TA = 25°C; requires thermal derating above ambient per published curve. |
| fT | 250 MHz - Gain-bandwidth product; supports high-speed digital switching up to ~10–20 MHz edge rates. |
Pinout & Package
Package: SC-59 - 3-pin surface-mount plastic package (JEDEC TO-236AB), dimensions: 2.70–3.00 mm length × 1.50–1.70 mm width × 0.35–0.50 mm height, lead-free matte tin finish, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Emitter terminal - connected to ground or low-side return path; internally tied to substrate reference. |
| 2 (Base) | B | Base terminal - input node for control signal; internally connected to R1 resistor top node. |
| 3 (Collector) | C | Collector terminal - output node for switched load; connects to VCC or active pull-up network. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 bias resistor | 2.2 kΩ ±30% - Enables direct GPIO interfacing without external bias components, reducing layout area and assembly steps. |
| SC-59 footprint compatibility | Standardized 3-pin SOT-23 variant - allows drop-in replacement in existing SOT-23 layouts with identical pad geometry and solder profile. |
| Guaranteed VCE(sat) | ≤ 0.3 V at IC/IB = 5 mA/0.5 mA - Ensures low-loss switching in battery-powered and thermally constrained designs. |
| RoHS-compliant construction | Lead-free matte tin plating over copper leadframe - meets global environmental compliance requirements without sacrificing solderability. |
| Epitaxial planar die | High uniformity and reproducibility - delivers consistent hFE and leakage across production lots for predictable system behavior. |
Applications
| Microcontroller GPIO Driver | LED Indicator Switch |
|---|---|
Use Scenario: Driving discrete LEDs from 3.3 V or 5 V MCU I/O pins with limited sink/source capability. IC Role / Device Role / Timing Role: NPN switch configured in low-side configuration, turning LED on/off via base control. Use Value: Eliminates need for external base resistor; VCE(sat) ≤ 0.3 V ensures >90% of supply voltage reaches LED anode for consistent brightness. | Use Scenario: Controlling status indicators in industrial HMI panels where space and component count are constrained. IC Role / Device Role / Timing Role: Discrete logic-level translator and current amplifier between MCU and LED load. Use Value: SC-59 footprint saves board area vs. discrete transistor + resistor; R1 tolerance ±30% maintains LED current stability across temperature. |
| Small-Signal Relay Driver | Level-Shifting Interface |
Use Scenario: Activating 5 V or 12 V coil relays from 3.3 V microcontroller outputs. IC Role / Device Role / Timing Role: Saturated switch providing sufficient coil current while isolating MCU from inductive transients. Use Value: VCEO = 50 V withstands relay coil flyback spikes; hFE ≥ 100 ensures full saturation with <0.5 mA base drive. | Use Scenario: Converting 1.8 V or 3.3 V logic signals to 5 V compatible levels for legacy peripherals. IC Role / Device Role / Timing Role: Active pull-down stage in open-collector level-shifting configuration. Use Value: Fast fT = 250 MHz supports clean edges up to 10 MHz; low VCE(sat) preserves noise margin in receiver circuitry. |
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 |
|---|---|---|---|
| NSV123T1T1G | Same R1 = 2.2 kΩ, but SOT-23 package with different pinout (Emitter/Base/Collector = Pin 1/2/3 vs. DDTC's E/B/C = Pin 1/2/3); slightly higher VCE(sat) (0.35 V). | Requires PCB layout revision due to non-identical pin mapping; not a drop-in replacement. | Select when SOT-23 sourcing is preferred and layout modification is acceptable. |
| EMH12T2R | Higher hFE (200–400), same R1 = 2.2 kΩ, identical SC-59 package and pinout; tighter VCE(sat) spec (≤ 0.25 V). | Direct pin-and-function replacement with improved saturation performance and gain consistency. | Preferred for new designs requiring lower conduction loss or tighter gain control. |
Compared with NSV123T1T1G and EMH12T2R, DDTC123TKA-7-F offers proven thermal reliability in SC-59, validated R1 tolerance, and broad distributor availability - making it optimal for cost-sensitive, high-volume consumer and industrial control applications where layout stability is prioritized.
Availability
DDTC123TKA-7-F is available at Aetrix Electronics and suitable for microcontroller GPIO drivers, LED indicator switches, and small-signal relay drivers requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for DDTC123TKA-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 DDTC (R1-only series) product line delivers pre-biased NPN transistors optimized for space-constrained digital interface applications, reducing bill-of-materials count and improving assembly yield in high-volume consumer and industrial electronics.
FAQ
What is the exact pin configuration for DDTC123TKA-7-F?
The DDTC123TKA-7-F uses SC-59 package with Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed by Diodes' official datasheet DS30339 Rev. 6 schematic and mechanical drawing. This matches standard SOT-23 pinout orientation when viewed from top with marking dot at top-left corner.
Does DDTC123TKA-7-F require an external base resistor?
No. DDTC123TKA-7-F integrates a single 2.2 kΩ base bias resistor (R1 only) between base and emitter terminals. No external resistor is needed for standard switching operation with 3.3 V or 5 V logic drive, simplifying circuit design and reducing component count.
What is the maximum operating temperature for continuous use?
The device supports continuous operation from –55°C to +150°C junction temperature. At ambient temperatures above 25°C, power dissipation must be linearly derated per the published curve: PD = 200 mW × (1 – (TA – 25)/150), down to zero at 175°C ambient on FR4 board.
Is DDTC123TKA-7-F suitable for analog amplification?
No. DDTC123TKA-7-F is characterized and optimized for saturated switching applications, not linear amplification. Its hFE variation, lack of small-signal linearity data, and integrated bias resistor make it unsuitable for analog gain stages; discrete transistors without built-in resistors are recommended instead.
DDTC123TKA-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:
- NPN - Pre-Biased
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 2.2 kOhms
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 500µA, 5mA
- Current - Collector Cutoff (Max):
- 500nA (ICBO)
- Frequency - Transition:
- 250 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
DDTC123TKA-7-F FAQ
1.How can I place an order for DDTC123TKA-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC123TKA-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 DDTC123TKA-7-F reliable?
The price and inventory of DDTC123TKA-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 DDTC123TKA-7-F is usually 5 days.
3.What payment methods are accepted for DDTC123TKA-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC123TKA-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC123TKA-7-F?
DDTC123TKA-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC123TKA-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 DDTC123TKA-7-F?
For technical support, including DDTC123TKA-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC123TKA-7-F requirements.
6.How does Aetrix verify that DDTC123TKA-7-F is sourced from the original manufacturer or authorized distributors?
All DDTC123TKA-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 DDTC123TKA-7-F meets industry standards.
7.What is the process for return or replacement of DDTC123TKA-7-F?
All DDTC123TKA-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC123TKA-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 DDTC123TKA-7-F part is unused and in its original packaging.
Return procedure for DDTC123TKA-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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