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Diodes Incorporated DDTC124TKA-7-F
- Part No.:
- DDTC124TKA-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTC124TKA-7-F.pdf
- Description:
- TRANS PREBIAS NPN 50V SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,766
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Product details
Overview
DDTC124TKA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor in SC-59 package with built-in 22 kΩ base bias resistor (R1 only), VCEO = 50 V, IC(max) = 100 mA, PD = 200 mW, and hFE = 100–600 at IC = 1 mA. It serves as a compact, space-saving switch or digital logic interface in low-power consumer and industrial control circuits.
For engineers reviewing the DDTC124TKA-7-F datasheet, DDTC124TKA-7-F pinout, DDTC124TKA-7-F application, or DDTC124TKA-7-F equivalent, key selection criteria include verified R1-only biasing topology, SC-59 footprint compatibility, guaranteed VCEO/IC ratings, hFE range under defined test conditions, and RoHS-compliant matte tin plating on copper leadframe.
Technical Context
This device integrates a single NPN silicon epitaxial planar transistor with one external-base-connected resistor (R1 = 22 kΩ ±30%), eliminating need for discrete bias components. It operates in saturation or cutoff mode for digital switching, not linear amplification.
Its thermal resistance RθJA = 625 °C/W is specified for FR4 PCB mounting per AP02001 layout; maximum junction temperature is +150 °C, and moisture sensitivity level is J-STD-020C Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum collector-emitter voltage before breakdown; defines safe switching window in 24 V/36 V logic-level systems. |
| IC(max) | 100 mA - Continuous collector current limit; supports driving LEDs, small relays, or gate inputs without external current limiting. |
| PD | 200 mW - Power dissipation rating at TA = 25 °C; requires derating above 25 °C per Fig. 1 curve. |
| R1 | 22 kΩ ±30% - Integrated base bias resistor enables direct TTL/CMOS logic-level drive without external pull-up/down. |
| hFE | 100–600 - DC current gain at IC = 1 mA, VCE = 5 V; ensures reliable saturation with IB ≥ 0.1×IC. |
| VCE(sat) | ≤0.3 V at IC/IB = 2.5 mA/0.25 mA - Low saturation voltage minimizes power loss and heat generation in switching applications. |
| fT | 250 MHz - Gain-bandwidth product; confirms suitability for signal switching up to ~10–20 MHz, not RF amplification. |
Pinout & Package
Package: SC-59 (SOT-23 variant), surface-mount, molded plastic case with UL 94V-0 flammability rating, 0.008 g weight, and matte tin-plated copper leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Reference node for current flow; connected to ground or low-side return path in common-emitter switch configuration. |
| 2 (Base) | B | Input control terminal; internally connected to R1 (22 kΩ) - no external bias required for logic-level drive. |
| 3 (Collector) | C | Output terminal; sinks load current when saturated; rated for 50 V and 100 mA continuous operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 bias resistor | 22 kΩ ±30% - eliminates two external resistors, reduces BOM count and PCB area in digital interface designs. |
| SC-59 package | 3-pin SMT footprint compatible with standard SOT-23 pick-and-place equipment and reflow profiles. |
| Lead-free/RoHS compliance | Matte tin finish over copper leadframe - meets global environmental regulations without compromising solderability. |
| Epitaxial planar construction | Ensures stable hFE and low leakage (ICBO, IEBO ≤ 0.5 μA) across -55 °C to +150 °C operating range. |
Applications
| LED Driver Circuit | Microcontroller GPIO Interface |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V MCU outputs. IC Role / Device Role / Timing Role: NPN switch configured in common-emitter mode, turning LED on/off via base logic signal. Use Value: Built-in 22 kΩ R1 ensures proper base current (≈100 µA @ 3.3 V) for full saturation without external resistor, reducing component count. | Use Scenario: Level-shifting and current amplification between low-drive-strength microcontroller pins and higher-current loads. IC Role / Device Role / Timing Role: Digital buffer/switch enabling MCU to safely control solenoids, small relays, or optocouplers. Use Value: Guaranteed VCEO = 50 V and IC = 100 mA allow direct interfacing with 24 V industrial I/O without additional protection circuitry. |
| Power Supply Enable Switch | Logic-Level Signal Inverter |
Use Scenario: Enabling/disabling auxiliary 5 V or 12 V rails using a system controller's active-low enable signal. IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling PMOS/NMOS pass transistor gate or LDO EN pin. Use Value: Low VCE(sat) ≤ 0.3 V minimizes voltage drop and power loss during rail activation, improving efficiency. | Use Scenario: Inverting TTL or CMOS logic signals where open-collector output is required. IC Role / Device Role / Timing Role: Active-low inverter stage providing clean signal inversion with defined rise/fall times. Use Value: fT = 250 MHz supports clean edge transitions up to ~20 MHz, suitable for clock buffering and serial data inversion. |
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 |
|---|---|---|---|
| NSV12400MT1G | R1 = 22 kΩ, but hFE min = 80 (vs. 100); VCEO = 50 V, same SC-70 package. | SC-70 is smaller than SC-59; may require layout revision and has higher thermal resistance. | Choose if board space is constrained and lower hFE margin is acceptable. |
| PDTC124ET,115 | R1 = 22 kΩ, but includes R2 (dual-resistor type); hFE min = 100; SOT-323 package. | Dual-resistor topology offers tighter bias stability but increases complexity for simple switching. | Prefer only if design requires improved input impedance or noise immunity from R2 feedback. |
Compared with NSV12400MT1G and PDTC124ET,115, DDTC124TKA-7-F provides optimal balance of proven SC-59 manufacturability, guaranteed hFE ≥100, and single-R1 simplicity-ideal for cost-sensitive, high-volume digital switching where layout stability and process maturity matter.
Availability
DDTC124TKA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfaces, and power supply enable switches requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for DDTC124TKA-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, specializing in high-reliability, application-optimized components for industrial, computing, and consumer markets.
The DDTC (R1-only series) is designed specifically for simplified digital switching in space-constrained, cost-driven applications-replacing discrete transistor + resistor combinations with a qualified, tested, and production-proven monolithic solution.
FAQ
What is the function of the internal 22 kΩ resistor in DDTC124TKA-7-F?
The internal 22 kΩ resistor (R1) connects between base and emitter, forming a fixed-current bias network that allows direct connection to TTL or CMOS logic outputs. It sets base current to ≈100 µA at 3.3 V, ensuring full saturation with IC up to 2.5 mA without external components.
Can DDTC124TKA-7-F replace a standard 2N3904 with external bias resistors?
Yes, in digital switching applications where base drive is logic-level (3.3 V or 5 V). Unlike 2N3904, it requires no external resistors and guarantees VCEO = 50 V and hFE ≥100 at IC = 1 mA. However, it cannot substitute in linear amplifier roles due to fixed bias topology.
Is DDTC124TKA-7-F suitable for automotive applications?
No-it is not AEC-Q101 qualified. While its operating temperature range (-55 °C to +150 °C) meets some automotive ambient requirements, Diodes Incorporated does not certify this part for automotive use, and it lacks stress-test validation per AEC standards.
What is the recommended PCB pad layout for SC-59 package reliability?
Use the land pattern specified in Diodes' AP02001 application note, which defines copper area, solder mask opening, and thermal relief for optimal solder joint strength and thermal performance. Deviation risks tombstoning or insufficient thermal dissipation under sustained 100 mA load.
DDTC124TKA-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):
- 22 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
DDTC124TKA-7-F FAQ
1.How can I place an order for DDTC124TKA-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC124TKA-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 DDTC124TKA-7-F reliable?
The price and inventory of DDTC124TKA-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 DDTC124TKA-7-F is usually 5 days.
3.What payment methods are accepted for DDTC124TKA-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC124TKA-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC124TKA-7-F?
DDTC124TKA-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC124TKA-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 DDTC124TKA-7-F?
For technical support, including DDTC124TKA-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC124TKA-7-F requirements.
6.How does Aetrix verify that DDTC124TKA-7-F is sourced from the original manufacturer or authorized distributors?
All DDTC124TKA-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 DDTC124TKA-7-F meets industry standards.
7.What is the process for return or replacement of DDTC124TKA-7-F?
All DDTC124TKA-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC124TKA-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 DDTC124TKA-7-F part is unused and in its original packaging.
Return procedure for DDTC124TKA-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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