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

Diodes Incorporated DDTC124GE-7-F

Name: DDTC124GE-7-F
Brand: Diodes Incorporated
SKU: DDTC124GE-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC124GE-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SOT-523

Datasheet:: DDTC124GE-7-F.pdf

Description:: TRANS PREBIAS NPN 50V SOT523

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

DDTC124GE-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single built-in 22 kΩ bias resistor (R2 only), housed in an SOT523 package. It supports 50 V V_CEO, 100 mA I_C, 150 mW power dissipation, and delivers h_FE = 56 (typ.) at I_C = 5 mA, V_CE = 5 V - used for level-shifting and digital switching in automotive body control modules.

For engineers reviewing the DDTC124GE-7-F datasheet, DDTC124GE-7-F pinout, DDTC124GE-7-F application, or DDTC124GE-7-F equivalent, key selection criteria include R2-only bias topology, AEC-Q101 qualification, SOT523 thermal performance (R_θJA = 833 °C/W), and guaranteed V_CE(SAT) ≤ 0.3 V at I_C = 10 mA / I_B = 0.5 mA.

Technical Context

This device implements a monolithic NPN transistor with integrated R2 base-emitter pull-up resistor only - no R1 - simplifying PCB layout for high-side switch configurations. Its 22 kΩ R2 enables predictable turn-on behavior with fixed base current under defined input voltage conditions.

Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and operates across –55 °C to +150 °C. The SOT523 package provides low thermal resistance when mounted on FR-4 with minimum pad layout, supporting stable gain (h_FE = 56 typ.) and f_T = 250 MHz at V_CE = 10 V, I_E = –5 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - maximum collector-emitter voltage before breakdown; enables use in 24 V automotive supply rails with margin.
I_C (max)	100 mA - continuous collector current rating; suitable for driving LEDs, relays, or logic-level interfaces.
h_FE	56 (typ.) at I_C = 5 mA, V_CE = 5 V - ensures reliable saturation with minimal base drive in digital switching.
V_CE(SAT)	≤ 0.3 V at I_C = 10 mA, I_B = 0.5 mA - reduces conduction loss and self-heating in always-on load control.
R2	22 kΩ ±30% - fixed base-emitter bias resistor enabling single-resistor configuration without external R1.
f_T	250 MHz - usable for signal amplification up to mid-frequency bands; verified with transistor-only test condition.
P_D	150 mW - power dissipation limit on FR-4 board; requires thermal derating above +25 °C ambient per Fig. 1.

Pinout & Package

SOT523 is a 3-terminal ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm) with matte tin terminals, UL 94V-0 rated molding compound, and moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Connected to ground or low-side return path; defines reference for R2 bias network.
Base (B)	Control input node	Internally connected only to R2; no direct external R1 connection - simplifies layout for high-side switch.
Collector (C)	Output current source	Drives load between V_CC and collector; supports 50 V max standoff and 100 mA switching.

Key Features

Feature	Design Value
R2-only bias topology	Eliminates need for external base resistor (R1), reducing component count and layout area in space-constrained modules.
AEC-Q101 qualification	Validated for automotive applications including body electronics, lighting, and HVAC controls requiring high reliability.
SOT523 footprint	Enables high-density placement on compact PCBs while maintaining thermal performance via optimized pad layout.
Halogen- and antimony-free "Green" construction	Meets global environmental compliance (RoHS 3, <900 ppm Br/Cl, <1000 ppm Sb) without compromising electrical specs.

Applications

Automotive LED Tail Light Control

Industrial PLC Digital Input Interface

Use Scenario: Switching 12 V LED arrays in rear lighting clusters with PWM dimming.

IC Role / Device Role / Timing Role: NPN pre-biased switch providing low-loss current sinking path synchronized to MCU GPIO.

Use Value: Guaranteed V_CE(SAT) ≤ 0.3 V minimizes heat generation during sustained 80 mA operation, extending LED lifetime.

Use Scenario: Level translation of 24 V field signals to 3.3 V logic inputs in modular I/O cards.

IC Role / Device Role / Timing Role: Digital interface transistor converting industrial voltage levels to safe microcontroller-compatible thresholds.

Use Value: 50 V V_CEO withstands transients on 24 V lines; R2-only design eliminates tuning of external bias resistors.

USB-C Port Power Switch Enable

Smart Home Sensor Node Load Management

Use Scenario: Enabling/disabling 5 V power delivery paths in USB-C receptacle circuits.

IC Role / Device Role / Timing Role: Low-side enable switch controlled by system PMIC to gate V_BUS to downstream devices.

Use Value: 100 mA I_C rating supports full USB-C 5 V/0.9 A charging mode; SOT523 fits tight connector-adjacent layouts.

Use Scenario: Managing battery-powered sensor actuation (e.g., solenoid valves, buzzer drivers) in Zigbee/Z-Wave nodes.

IC Role / Device Role / Timing Role: Efficient load driver minimizing quiescent current during sleep cycles using R2-defined leakage control.

Use Value: IEBO = 140 µA (max) at V_EB = 4 V ensures low standby drain; AEC-Q101 grade adds robustness for outdoor deployment.

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
DDTC124TK-7-F	SOT323 package (larger footprint); identical R2 = 22 kΩ, h_FE = 56, but R_θJA = 430 °C/W.	Better thermal performance but occupies ~3× more board area; not suitable for ultra-dense layouts.	Select when thermal headroom is critical and PCB space allows SOT323.
NSV124GUT1G	Same SOT523 package, R2 = 22 kΩ, but h_FE = 35–70 (wider min–max spread); not AEC-Q101 qualified.	Lacks automotive qualification; acceptable for commercial-grade consumer IoT but not for automotive BOMs.	Select only for cost-sensitive non-automotive designs where qualification is not required.

Compared with DDTC124GE-7-F, DDTC124TK-7-F trades board space for lower thermal resistance, while NSV124GUT1G offers similar form factor without AEC-Q101 assurance - making DDTC124GE-7-F the optimal choice for space-constrained, automotive-compliant switching.

Availability

DDTC124GE-7-F is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input conditioning, and USB-C power path management requiring stable component supply and long-term lifecycle support.

Supply support for DDTC124GE-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 components for automotive, industrial, and computing markets.

The DDTC R2-Only Series targets cost-optimized, space-efficient digital switching in automotive body electronics, delivering pre-biased transistors with AEC-Q101 validation and green material compliance.

FAQ

What is the function of the R2-only bias configuration in DDTC124GE-7-F?

The R2-only configuration integrates a single 22 kΩ resistor between base and emitter, eliminating the need for an external R1 pull-up. This simplifies circuit design for high-side switching applications where the base is driven directly by a logic signal, ensuring predictable turn-on without additional passive components.

Does DDTC124GE-7-F support 24 V automotive systems?

Yes - its 50 V V_CEO and 50 V V_CBO ratings provide sufficient margin for 24 V nominal systems, including load dump transients. Combined with AEC-Q101 qualification and –55 °C to +150 °C operating range, it is validated for under-hood and body-control module use.

How does the SOT523 package affect thermal performance?

The SOT523 package has R_θJA = 833 °C/W on FR-4 with minimum pad layout. While smaller than SOT23 or SOT323, its thermal resistance requires careful attention to copper pour and ambient temperature limits - derating begins above +25 °C per Figure 1 in the datasheet.

Can DDTC124GE-7-F replace a standard NPN transistor like BC847?

No - it is not a drop-in replacement. Unlike BC847, DDTC124GE-7-F lacks external base resistor flexibility and is optimized for digital switching with fixed R2 bias. Use only where R2-only topology matches the target circuit's drive architecture and saturation requirements.

DDTC124GE-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: DDTC (R2-ONLY SERIES) E

Package/Case:: SOT-523

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN - Pre-Biased

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Resistor - Base (R1):: -

Resistor - Emitter Base (R2):: 22 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 56 @ 5mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 500µA, 10mA

Current - Collector Cutoff (Max):: 500nA (ICBO)

Frequency - Transition:: 250 MHz

Power - Max:: 150 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-523

DDTC124GE-7-F FAQ

1.How can I place an order for DDTC124GE-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC124GE-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 DDTC124GE-7-F reliable?

The price and inventory of DDTC124GE-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 DDTC124GE-7-F is usually 5 days.

3.What payment methods are accepted for DDTC124GE-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC124GE-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC124GE-7-F?

DDTC124GE-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC124GE-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 DDTC124GE-7-F?

For technical support, including DDTC124GE-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC124GE-7-F requirements.

6.How does Aetrix verify that DDTC124GE-7-F is sourced from the original manufacturer or authorized distributors?

All DDTC124GE-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 DDTC124GE-7-F meets industry standards.

7.What is the process for return or replacement of DDTC124GE-7-F?

All DDTC124GE-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC124GE-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 DDTC124GE-7-F part is unused and in its original packaging.

Return procedure for DDTC124GE-7-F:

1.Submit a request within 90 days.

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

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