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 DDTC125TE-7-F

Name: DDTC125TE-7-F
Brand: Diodes Incorporated
SKU: DDTC125TE-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: DDTC125TE-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: SOT-523

Datasheet:: DDTC125TE-7-F.pdf

Description:: TRANS PREBIAS NPN 50V SOT523

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,538

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

Product details

Overview

DDTC125TE-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package with integrated 200 kΩ base bias resistor (R1 only), rated for 50 V V_CEO, 100 mA I_C(MAX), and 150 mW power dissipation; used in compact logic-level switching, LED driver biasing, and automotive signal conditioning circuits.

For engineers reviewing the DDTC125TE-7-F datasheet, DDTC125TE-7-F pinout, DDTC125TE-7-F application, or DDTC125TE-7-F equivalent, key selection criteria include verified h_FE range (100–600 at I_C = 1 mA), V_CE(sat) ≤ 0.3 V under I_C/I_B = 0.5 mA/0.05 mA, R1 tolerance (±30%), AEC-Q101 qualification status, and SOT523 thermal resistance (833 °C/W).

Technical Context

This device implements a single-NPN transistor with monolithic integration of a precision 200 kΩ base resistor (R1), eliminating external bias components. It operates as a digital switch or current amplifier in low-power, space-constrained nodes where predictable turn-on threshold and stable gain are required.

The R1-only topology simplifies PCB layout by removing the need for discrete base resistors while maintaining full control over base current via input voltage. Its 50 V breakdown ratings and -55 °C to +150 °C operating range support use in automotive body electronics and industrial sensor interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown; enables use in 24 V automotive and 3.3/5 V logic systems with margin.
I_C(MAX)	100 mA - Continuous collector current limit; supports driving small relays, LEDs, or logic inputs without external current limiting.
h_FE	100–600 - DC current gain at I_C = 1 mA, V_CE = 5 V; ensures reliable saturation across process and temperature variation.
R1	200 kΩ ±30% - Integrated base bias resistor value; sets input current for defined switching thresholds without external components.
V_CE(sat)	≤ 0.3 V at I_C/I_B = 0.5 mA/0.05 mA - Low saturation voltage minimizes power loss and heat generation in switching applications.
P_D	150 mW - Power dissipation rating on FR-4 board; defines maximum steady-state power handling under ambient conditions.

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 mm × 1.60 mm × 0.55 mm), moisture sensitivity level 1, matte tin terminals, UL 94V-0 rated molding compound.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for current flow; connected to ground or low-side return path in common-emitter configurations.
2 (Base)	Base terminal with internal R1 connection	Input node tied to 200 kΩ resistor; accepts logic-level voltage to control transistor conduction without external bias network.
3 (Collector)	Collector terminal	Output node sourcing current to load; connects to supply rail or active-high load in high-side switching arrangements.

Key Features

Feature	Design Value
Integrated R1 bias resistor	200 kΩ ±30% - eliminates need for external base resistor, reducing BOM count and PCB area in digital interface circuits.
AEC-Q101 qualification	Qualified for automotive applications - meets stress test requirements for temperature cycling, HTRB, and ESD per AEC standard.
Green construction	Halogen- and antimony-free, RoHS 3 compliant - satisfies environmental compliance mandates for automotive and industrial OEMs.
SOT523 footprint	1.6 mm × 1.6 mm outline - enables high-density routing in space-limited modules such as ECUs, lighting controllers, and sensor nodes.

Applications

Automotive Door Module Switching

Industrial Sensor Interface

Use Scenario: Controlling window lift motor enable signals in door control units using 3.3 V microcontroller GPIO outputs.

IC Role / Device Role / Timing Role: NPN pre-biased switch translating logic-level signals into 12 V/24 V load activation.

Use Value: Eliminates discrete base resistor, reduces component count, and ensures consistent turn-on behavior across temperature (-40 °C to +125 °C).

Use Scenario: Level-shifting and current amplification for analog sensor output stages feeding ADC inputs in PLC I/O modules.

IC Role / Device Role / Timing Role: Signal conditioning transistor providing buffered current drive to maintain signal integrity over long traces.

Use Value: Stable h_FE (100–600) and low V_CE(sat) (<0.3 V) preserve dynamic range and minimize offset error in precision measurement paths.

LED Status Indicator Driver

Low-Power Logic-Level Translation

Use Scenario: Driving multi-color status LEDs in battery-powered handheld devices where board space and power efficiency are critical.

IC Role / Device Role / Timing Role: Constant-current switch regulating LED brightness via PWM-controlled base input.

Use Value: Integrated R1 enables direct MCU GPIO connection; 150 mW power rating allows sustained operation without heatsinking.

Use Scenario: Interfacing 1.8 V FPGA I/O banks with 5 V legacy peripherals in embedded computing platforms.

IC Role / Device Role / Timing Role: Voltage-level translator using saturated switching mode to convert logic states between incompatible voltage domains.

Use Value: Predictable V_CE(sat) and fast f_T (250 MHz) support clean edge transitions up to 10 MHz clock rates.

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
DDTC125TK-7-F	SOT-323 package (larger footprint, higher R_θJA = 625 °C/W); same R1 = 200 kΩ, identical electrical specs.	Preferred where manual rework or thermal margin is prioritized over miniaturization.	Select when SOT-323 assembly infrastructure exists and board space permits larger footprint.
NSV12500MT1G	220 kΩ R1 (±30%), SOT-523 package, same V_CEO/I_C ratings, but not AEC-Q101 qualified.	Acceptable for commercial-grade consumer electronics but unsuitable for automotive PPAP programs.	Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated.

Compared with DDTC125TK-7-F, the DDTC125TE-7-F offers superior board-area efficiency in SOT523; versus NSV12500MT1G, it provides certified automotive reliability and traceable PPAP documentation-critical for Tier 1 supply chain compliance.

Availability

DDTC125TE-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial sensor interfaces, LED status indicators, and low-power logic-level translation requiring stable component supply and long-term lifecycle management.

Supply support for DDTC125TE-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.

This part belongs to the DDTC (R1-ONLY SERIES) E family, designed specifically for space-constrained digital switching applications requiring integrated biasing, AEC-Q101 qualification, and green manufacturing compliance.

FAQ

Is DDTC125TE-7-F still in active production?

No-DDTC125TE-7-F is marked "Obsolete" in Diodes' official ordering information. However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle management support including last-time buy planning and cross-reference guidance for functional replacements.

What is the function of the internal 200 kΩ resistor?

The internal 200 kΩ resistor (R1) connects between the base and emitter terminals, forming a fixed-base bias network that allows direct connection to logic-level voltage sources. It sets the base current to ensure predictable saturation under defined I_C/I_B ratios without external components.

Can DDTC125TE-7-F replace a standard NPN transistor like BC847?

Yes-but only in circuits where the base is driven by a voltage source (not current-limited). The integrated R1 eliminates the need for an external base resistor, so substitution requires verifying that the original design's base drive matches the pre-biased configuration and that V_CE(sat) and h_FE meet system timing and gain requirements.

Does this part support hot-swap or in-circuit programming?

No-DDTC125TE-7-F is not designed for hot-swap operation. Its absolute maximum ratings do not include transient overvoltage or ESD robustness beyond standard human-body model (HBM) levels. For hot-swap applications, external protection circuitry (e.g., TVS diodes, series resistors) must be added per system-level requirements.

DDTC125TE-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-523

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):: 200 kOhms

Resistor - Emitter Base (R2):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 50µA, 500µA

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

DDTC125TE-7-F FAQ

1.How can I place an order for DDTC125TE-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTC125TE-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 DDTC125TE-7-F reliable?

The price and inventory of DDTC125TE-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 DDTC125TE-7-F is usually 5 days.

3.What payment methods are accepted for DDTC125TE-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC125TE-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTC125TE-7-F?

DDTC125TE-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTC125TE-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 DDTC125TE-7-F?

For technical support, including DDTC125TE-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC125TE-7-F requirements.

6.How does Aetrix verify that DDTC125TE-7-F is sourced from the original manufacturer or authorized distributors?

All DDTC125TE-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 DDTC125TE-7-F meets industry standards.

7.What is the process for return or replacement of DDTC125TE-7-F?

All DDTC125TE-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTC125TE-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 DDTC125TE-7-F part is unused and in its original packaging.

Return procedure for DDTC125TE-7-F:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

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…