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

Diodes Incorporated DDTC123YE-7-F

Name: DDTC123YE-7-F
Brand: Diodes Incorporated
SKU: DDTC123YE-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTC123YE-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SOT-523

Datasheet:: DDTC123YE-7-F.pdf

Description:: TRANS PREBIAS NPN 50V SOT523

Quantity:: RFQ Add To RFQ list

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Product details

Overview

DDTC123YE-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package with integrated R1 = 2.2 kΩ and R2 = 10 kΩ bias resistors (R1 ≠ R2), V_CEO = 50 V, I_C(max) = 100 mA, and DC current gain (h_FE) ≥ 33 at I_C = 10 mA - used for logic-level signal switching in space-constrained consumer and industrial control circuits.

For engineers reviewing the DDTC123YE-7-F datasheet, DDTC123YE-7-F pinout, DDTC123YE-7-F application, or DDTC123YE-7-F equivalent, this page delivers verified electrical parameters, validated SOT523 terminal mapping, confirmed automotive-grade process qualifications, and direct alternatives with documented R1/R2 ratio and VI(on) differences.

Technical Context

This device integrates a monolithic NPN transistor with two discrete on-die biasing resistors (R1 = 2.2 kΩ, R2 = 10 kΩ), enabling single-resistor input drive and eliminating external base bias components. Its R1 ≠ R2 topology supports precise VI(on) threshold tuning - here specified as 3.0 V at I_O = 20 mA with V_O = 0.3 V.

Designed for low-power digital interface applications, it operates within -55°C to +150°C, delivers f_T = 250 MHz, and maintains VO(on) ≤ 0.3 V at I_O = 5 mA / I_L = 0.25 mA - confirming suitability for rail-to-rail CMOS/TTL-compatible switching with minimal saturation voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - maximum collector-emitter voltage before breakdown; supports 24 V industrial bus and 3.3/5 V logic interfacing without derating.
I_C(max)	100 mA - continuous collector current rating; sufficient for driving LEDs, small relays, or MOSFET gates in compact systems.
R1 / R2	2.2 kΩ / 10 kΩ - asymmetric internal bias network enabling VI(on) = 3.0 V at 20 mA output; eliminates need for external pull-up/down resistors.
h_FE	≥33 - DC current gain at I_C = 10 mA; ensures stable saturation under typical microcontroller GPIO drive conditions.
f_T	250 MHz - transition frequency at V_CE = 10 V, I_E = 5 mA; supports fast digital switching up to ~10–20 MHz edge rates.
P_D	150 mW - power dissipation on FR-4 PCB; enables operation at full I_C without heatsinking in ambient ≤ 70°C.

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm), moisture sensitivity level 1, matte tin-plated leads, RoHS-compliant and halogen-free.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter connection	Reference node for bias network; tied internally to R2; connects to ground or low-side return path.
2 (Base)	Input control node	Internal junction of R1 and R2; accepts logic-level input (VI(on) = 3.0 V); no external base resistor required.
3 (Collector)	Output switch node	High-side load connection point; sinks up to 100 mA when saturated; compatible with open-collector logic interfaces.

Key Features

Feature	Design Value
Integrated R1 ≠ R2 bias network	2.2 kΩ / 10 kΩ values enable precise 3.0 V VI(on) threshold - reduces BOM count and layout area vs. discrete bias solutions.
SOT523 footprint	1.60 × 1.60 mm outline with 0.50 mm pitch - fits high-density PCBs where space is constrained, e.g., wearables and sensor modules.
Automotive-capable process	Manufactured in IATF 16949-certified facilities; AEC-Q101 qualified upon request - supports Tier-1 supply chain traceability and PPAP compliance.
Green, lead-free construction	Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb); meets RoHS 3 (2015/863/EU) and JEDEC J-STD-020 Level 1 standards.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving indicator LEDs from 3.3 V MCU outputs in portable medical devices.

IC Role / Device Role / Timing Role: Low-side switch that replaces discrete BJT + two resistors, reducing component count by 3×.

Use Value: VO(on) ≤ 0.3 V at 5 mA ensures >90% LED forward voltage utilization and extends battery life in coin-cell-powered units.

Use Scenario: Adding extra digital outputs to resource-limited 8-bit MCUs in HVAC control panels.

IC Role / Device Role / Timing Role: Logic-level translator and current amplifier between MCU port pins and 5 V relay coils.

Use Value: VI(on) = 3.0 V guarantees reliable turn-on from 3.3 V GPIO while maintaining noise margin against V_IL thresholds.

Level-Shifting Interface

Power Sequencing Control

Use Scenario: Isolating 1.8 V FPGA configuration signals from 5 V peripheral power rails during boot.

IC Role / Device Role / Timing Role: Unidirectional active-low level shifter with defined VI(off) = 0.3 V and VI(on) = 3.0 V.

Use Value: Asymmetric R1/R2 provides clean logic transition without external hysteresis, preventing metastability during voltage ramp-up.

Use Scenario: Enabling sequential power-up of analog sensors and RF transceivers in IoT edge nodes.

IC Role / Device Role / Timing Role: Delayed-enable switch triggered by MCU-controlled GPIO after system reset stabilization.

Use Value: 100 mA I_C(max) and 150 mW P_D support sustained 50 mA loads for >100 ms - sufficient for LDO enable sequencing.

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
DDTC123JE-7-F	R1 = 2.2 kΩ, R2 = 47 kΩ; VI(on) = 3.0 V at I_O = 5 mA (vs. 20 mA for DDTC123YE)	Higher input impedance; better suited for weak-drive sources like op-amp outputs or high-Z comparators	Select when driving from low-current sources where 20 mA input demand is excessive.
DDTC143XE-7-F	R1 = 4.7 kΩ, R2 = 10 kΩ; VI(on) = 1.1 V at I_O = 20 mA	Lower VI(on) threshold; compatible with 1.8 V logic families and battery-voltage-sensing circuits	Choose for sub-2.5 V systems where DDTC123YE's 3.0 V VI(on) would cause marginal turn-on.

Compared with DDTC123JE-7-F and DDTC143XE-7-F, DDTC123YE-7-F offers balanced input drive strength (3.0 V @ 20 mA) and moderate R2 value - making it optimal for standard 3.3 V MCU GPIO interfacing without overloading source drivers or compromising noise immunity.

Availability

DDTC123YE-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and level-shifting interfaces requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle assurance.

Supply support for DDTC123YE-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.

This part belongs to the DDTC (R1≠R2 SERIES) E family - engineered specifically for simplified digital switching in space- and cost-sensitive applications, with emphasis on automotive-qualified reliability and green material compliance.

FAQ

What is the absolute maximum input voltage for DDTC123YE-7-F?

The absolute maximum input voltage (VIN) is -5 V to +12 V, as specified in the Absolute Maximum Ratings table. Exceeding +12 V risks damaging the internal R1 resistor or base-emitter junction; operation above 5 V requires verification of power dissipation in R1 under steady-state conditions.

Is DDTC123YE-7-F qualified for automotive use?

DDTC123YE-7-F is manufactured in IATF 16949-certified facilities and supports AEC-Q101 qualification upon request. While not pre-qualified out-of-box, Diodes provides PPAP documentation and change control for automotive programs - contact their automotive team for formal qualification status and test reports.

How does the R1 ≠ R2 configuration affect switching behavior?

The asymmetric R1 (2.2 kΩ) and R2 (10 kΩ) values set a defined VI(on) threshold of 3.0 V at 20 mA output current, improving noise immunity over symmetric bias networks. This configuration also lowers base current demand compared to R1 = R2 designs, reducing MCU GPIO loading and enabling faster turn-off via R2 discharge path.

Can DDTC123YE-7-F replace a standard 2N3904 with external bias resistors?

Yes - it directly replaces a 2N3904 + two external resistors in low-speed switching applications. Key advantages include guaranteed R1/R2 tolerance (±30% for R1, ±20% for R2/R1 ratio), reduced PCB area, and tighter h_FE distribution. However, it is not suitable for linear amplification due to fixed bias topology.

DDTC123YE-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: DDTC (R1 R2 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):: 2.2 kOhms

Resistor - Emitter Base (R2):: 10 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 33 @ 10mA, 5V

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

Current - Collector Cutoff (Max):: 500nA

Frequency - Transition:: 250 MHz

Power - Max:: 150 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-523

DDTC123YE-7-F FAQ

1.How can I place an order for DDTC123YE-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC123YE-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 DDTC123YE-7-F reliable?

The price and inventory of DDTC123YE-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 DDTC123YE-7-F is usually 5 days.

3.What payment methods are accepted for DDTC123YE-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC123YE-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC123YE-7-F?

DDTC123YE-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC123YE-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 DDTC123YE-7-F?

For technical support, including DDTC123YE-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC123YE-7-F requirements.

6.How does Aetrix verify that DDTC123YE-7-F is sourced from the original manufacturer or authorized distributors?

All DDTC123YE-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 DDTC123YE-7-F meets industry standards.

7.What is the process for return or replacement of DDTC123YE-7-F?

All DDTC123YE-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC123YE-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 DDTC123YE-7-F part is unused and in its original packaging.

Return procedure for DDTC123YE-7-F:

1.Submit a request within 90 days.

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

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