Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

Diodes Incorporated DDTC124GCA-7

Name: DDTC124GCA-7
Brand: Diodes Incorporated
SKU: DDTC124GCA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: DDTC124GCA-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTC124GCA-7.pdf

Description:: TRANS PREBIAS NPN 200MW SOT23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,447

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

DDTC124GCA-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor in SOT-23 package, featuring a built-in 22 kΩ bias resistor (R2 only), 50 V V_CEO, 100 mA I_C(max), and h_FE = 56 (typ.) at 5 mA/5 V - used for level-shifting and digital switching in compact logic interface circuits.

For engineers reviewing the DDTC124GCA-7 datasheet, DDTC124GCA-7 pinout, DDTC124GCA-7 application, or DDTC124GCA-7 equivalent, key selection criteria include verified R2-only bias topology, guaranteed V_CEO/V_CBO ratings, h_FE binning consistency, thermal derating per FR4 layout, and RoHS-compliant green molding compound compliance.

Technical Context

This device implements a single-NPN transistor with integrated base-emitter pull-down resistor (R2 = 22 kΩ ±30%), eliminating external bias components in saturated-switch applications. It operates with V_EBO = 5 V and supports I_C up to 100 mA under continuous DC conditions.

The R2-only configuration enables direct TTL/CMOS-compatible input drive without external base resistors, while its 200 mW power dissipation and 625 °C/W R_θJA require adherence to Diodes Inc.'s AP02001 pad layout for thermal integrity at full load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - maximum collector-emitter voltage before breakdown; defines safe operating range in low-voltage switching rails.
I_C(max)	100 mA - absolute max continuous collector current; sets upper limit for load-driving capability in digital output stages.
h_FE	56 (typ.) at I_C = 5 mA, V_CE = 5 V - current gain value used to size drive current for reliable saturation in logic-level interfaces.
R2	22 kΩ ±30% - fixed internal base-emitter bias resistor enabling resistorless connection to CMOS/TTL outputs.
V_CE(sat)	0.3 V max at I_C = 10 mA, I_B = 0.5 mA - ensures low conduction loss and minimal voltage drop in ON-state switching.
P_D	200 mW - maximum power dissipation on FR4 board with AP02001 layout; determines thermal margin in ambient temperatures up to +70°C.

Pinout & Package

Package: SOT-23 surface-mount plastic case (UL 94V-0), 0.008 g weight, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for bias network; connects to ground or low-side return path in switch configurations.
2 (Base)	Base terminal	Internally connected to R2; accepts logic-level input directly without external resistor.
3 (Collector)	Collector terminal	Output node driving loads; requires external pull-up or active load in open-collector topologies.

Key Features

Feature	Design Value
R2-only bias topology	Eliminates need for external base resistor in digital input stages, reducing BOM count and PCB area.
22 kΩ internal R2 tolerance	±30% ensures consistent turn-on threshold across production lots for predictable logic-level compatibility.
RoHS-compliant green compound	Halogen- and antimony-free molding material meets IPC-1752A environmental compliance requirements.
Thermal rating validation	625 °C/W R_θJA confirmed with AP02001 pad layout, enabling accurate junction temperature estimation.

Applications

Logic Level Translation

Microcontroller GPIO Driver

Use Scenario: Translating 3.3 V microcontroller outputs to 5 V peripheral inputs in mixed-voltage systems.

IC Role / Device Role: NPN switch configured as active-low level shifter with R2 enabling direct 3.3 V logic drive.

Use Value: Eliminates discrete resistor network while maintaining <0.3 V V_CE(sat) for clean high-to-low transition fidelity.

Use Scenario: Driving LED indicators or small relays from resource-constrained MCU pins.

IC Role / Device Role: Single-transistor load switch with integrated bias, simplifying firmware-controlled ON/OFF sequencing.

Use Value: Reduces external component count by one resistor per channel and supports 100 mA peak load current.

Industrial Sensor Interface

Automotive Body Control Module

Use Scenario: Conditioning open-collector sensor outputs (e.g., Hall effect, reed switches) into clean digital signals.

IC Role / Device Role: Signal conditioning switch with defined V_CEO = 50 V and ESD-robust construction.

Use Value: Withstands transient voltages up to 50 V and provides stable h_FE-based gain control for noise-immune signal acquisition.

Use Scenario: Controlling solenoid valves or status LEDs in 12 V automotive subsystems.

IC Role / Device Role: Low-power interface element compliant with AEC-Q101 stress test conditions (per Diodes Inc. qualification).

Use Value: Green compound and -55°C to +150°C operating range support under-hood deployment without derating penalties.

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
DDTC114GCA-7	R2 = 10 kΩ (vs. 22 kΩ); h_FE = 30 (typ.) - lower gain, higher base current demand.	Better suited for higher-speed switching where faster turn-on is needed despite reduced DC gain.	Select when driving capacitive loads or requiring shorter t_on at same V_IN.
DDTC144GCA-7	R2 = 47 kΩ (vs. 22 kΩ); h_FE = 68 (typ.) - higher gain, lower base current draw.	Preferred for ultra-low-power microcontroller I/O where sourcing <10 µA is critical.	Select when minimizing MCU port loading is prioritized over switching speed.

Compared with DDTC114GCA-7 and DDTC144GCA-7, DDTC124GCA-7 offers balanced base resistance and gain - delivering optimal trade-off between drive strength and power efficiency for general-purpose logic interfacing across industrial and consumer designs.

Availability

DDTC124GCA-7 is available at Aetrix Electronics and suitable for logic level translation, microcontroller GPIO expansion, and industrial sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for DDTC124GCA-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, serving industrial, computing, communications, and consumer markets.

This part belongs to the DDTC R2-Only Series - designed specifically for simplified digital switching in space-constrained PCBs where resistorless biasing reduces layout complexity and improves assembly yield.

FAQ

What is the function of the "R2-only" configuration in DDTC124GCA-7?

The R2-only configuration means only a base-to-emitter resistor (22 kΩ) is integrated - no base-to-collector resistor. This enables direct logic-level input drive while ensuring predictable turn-off behavior via emitter grounding, making it ideal for saturated switching without external bias components.

Does DDTC124GCA-7 meet AEC-Q101 requirements for automotive use?

Yes - Diodes Incorporated qualifies the DDTC124GCA-7 under AEC-Q101 for stress testing including HTSL, TC, AC, and mechanical shock. Its -55°C to +150°C operating range, green compound, and validated thermal performance support under-hood body control module applications.

How does the 625 °C/W R_θJA value impact thermal design?

This value assumes mounting on FR4 with Diodes Inc.'s AP02001 recommended pad layout. At 100 mA and 0.3 V V_CE(sat), power dissipation is 30 mW - resulting in ~18.75°C junction rise above ambient, well within safe limits for operation up to +70°C ambient without heatsinking.

Can DDTC124GCA-7 replace standard NPN transistors like BC847 in existing designs?

Only if the circuit relies on external base biasing - DDTC124GCA-7's internal R2 changes the drive topology. Direct replacement requires removing the external base resistor and verifying that logic-high voltage fully saturates the device (V_IN ≥ 2.0 V typical for 10 mA I_C).

DDTC124GCA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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:: -

DDTC124GCA-7 FAQ

1.How can I place an order for DDTC124GCA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC124GCA-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 DDTC124GCA-7 reliable?

The price and inventory of DDTC124GCA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC124GCA-7 is usually 5 days.

3.What payment methods are accepted for DDTC124GCA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC124GCA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC124GCA-7?

DDTC124GCA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC124GCA-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 DDTC124GCA-7?

For technical support, including DDTC124GCA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC124GCA-7 requirements.

6.How does Aetrix verify that DDTC124GCA-7 is sourced from the original manufacturer or authorized distributors?

All DDTC124GCA-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 DDTC124GCA-7 meets industry standards.

7.What is the process for return or replacement of DDTC124GCA-7?

All DDTC124GCA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC124GCA-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 DDTC124GCA-7 part is unused and in its original packaging.

Return procedure for DDTC124GCA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

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…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

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…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

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…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

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…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

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.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

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.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

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…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

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…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

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…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

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…