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Diodes Incorporated DDTC124XE-7
- Part No.:
- DDTC124XE-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- -
- Datasheet:
-
DDTC124XE-7.pdf
- Description:
- TRANS PREBIAS NPN 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:5,144
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Product details
Overview
DDTC124XE-7 from Diodes Incorporated is an NPN pre-biased transistor in SOT523 package with integrated R1 = 22 kΩ and R2 = 47 kΩ bias resistors (R1 ≠ R2), VI(off) = 0.4 V, VI(on) = 1.4 V at IO = 2 mA, and IC(max) = 50 mA - used for digital logic-level switching in space-constrained load control circuits.
For engineers reviewing the DDTC124XE-7 datasheet, DDTC124XE-7 pinout, DDTC124XE-7 application, or DDTC124XE-7 equivalent, this part serves as a compact, RoHS-compliant, lead-free digital transistor for low-current switching where precise input threshold and guaranteed saturation are required without external bias network design.
Technical Context
This device integrates an NPN bipolar transistor with two non-matching on-chip resistors (R1 = 22 kΩ, R2 = 47 kΩ) to provide fixed base biasing that ensures reliable turn-on at 1.4 V input and full cutoff below 0.4 V. Its internal resistor ratio (R2/R1 ≈ 2.14) sets the current gain stabilization point.
Designed for DC-coupled digital interface applications, it operates with VCC up to 40 V, delivers 50 mA max output current, and maintains VO(on) ≤ 0.3 V at IO = 2 mA - enabling low-loss switching in 3.3 V/5 V logic-driven loads such as LED indicators and small-signal relays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VI(on) | 1.4 V @ IO = 2 mA - guarantees reliable turn-on with standard 3.3 V logic high |
| VI(off) | 0.4 V @ IO = 100 μA - ensures solid cutoff under noisy or weak-drive conditions |
| IC(max) | 50 mA - supports driving small solenoids, LEDs, or logic inputs without external current limiting |
| VO(on) | ≤ 0.3 V @ IO = 2 mA - minimizes power loss and self-heating in always-on or PWM duty-cycle applications |
| R1 / R2 | 22 kΩ / 47 kΩ - asymmetric bias network provides stable gain control and predictable switching thresholds |
| PD | 150 mW - limits thermal rise on FR-4 PCBs with minimum pad layout, suitable for continuous operation at ≤ 30 mA |
| fT | 250 MHz - enables use in moderate-speed digital signal routing (e.g., clock enable, reset assertion) |
Pinout & Package
Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm), matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.002 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Input reference node for bias network | Connected internally to R2; forms common return path for base current and output current |
| 2 (Base) | Internal junction of R1 and R2 | Provides fixed bias point; no external connection required - simplifies PCB layout |
| 3 (Collector) | Active output terminal | Switches load to VCC; rated for 40 V max and 50 mA continuous current |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric internal bias resistors (R1 ≠ R2) | 22 kΩ / 47 kΩ ratio enables precise VI(on)/VI(off) separation for noise-immune digital switching |
| Guaranteed VO(on) ≤ 0.3 V | Ensures <100 mW dissipation at 2 mA load - eliminates need for heatsinking in portable designs |
| SOT523 footprint | 1.6 mm × 1.6 mm area saves >60% board space vs. SOT23 - critical for wearables and sensor nodes |
| AEC-Q101 qualified option available | Manufactured in IATF 16949 certified facilities - supports automotive body electronics qualification paths |
| Halogen- and antimony-free "Green" compound | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets JEDEC J-STD-70B and EU ELV requirements |
Applications
| LED Indicator Control | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Driving status LEDs from low-drive-strength MCU pins (e.g., ESP32, STM32L0). IC Role / Device Role / Timing Role: Digital switch translating 3.3 V logic into 2–20 mA LED current with no external resistors. Use Value: Eliminates two discrete bias resistors per channel, reducing BOM count and layout area by 35% in multi-LED panels. |
Use Scenario: Adding buffered digital outputs to resource-constrained microcontrollers with limited GPIO drive capability. IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between 1.8–3.3 V logic and 5 V peripheral enable lines. Use Value: Enables direct connection to 5 V sensors or displays without level translators - cuts latency and component cost. |
| Low-Power Sensor Enable Switching | Industrial I/O Module Input Conditioning |
|
Use Scenario: Power-gating analog sensors (e.g., temperature, humidity) during sleep cycles in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-leakage (IO(off) ≤ 0.5 μA) switch controlling VCC to sensor supply rail. Use Value: Reduces quiescent current by >95% vs. discrete BJT + resistor solution - extends shelf life of coin-cell devices. |
Use Scenario: Converting 24 V PLC field signals to 3.3 V logic levels for ARM-based controller inputs. IC Role / Device Role / Timing Role: High-VCC (40 V) tolerant input stage with built-in voltage divider and clamping. Use Value: Replaces Zener + BJT + resistor network - improves ESD robustness and reduces failure modes in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTC114YE-7-F | R1 = 10 kΩ, R2 = 47 kΩ; lower VI(on) = 1.3 V, higher IO = 70 mA | Better suited for 1.8 V logic interfaces and higher-current loads (e.g., buzzer drivers) | Select when interfacing with sub-2 V MCUs or requiring >50 mA sink capability |
| DDTC144VE-7-F | R1 = 47 kΩ, R2 = 10 kΩ; higher VI(on) = 3.0 V, lower IO = 30 mA | Optimized for 5 V TTL compatibility and ultra-low standby current (IO(off) ≤ 0.5 μA) | Select for legacy 5 V systems or ultra-low-power wake-up detection circuits |
Compared with DDTC114YE-7-F and DDTC144VE-7-F, DDTC124XE-7 offers balanced input threshold (1.4 V), moderate current drive (50 mA), and optimal R1/R2 asymmetry for noise margin in mixed-voltage 3.3 V embedded systems - making it the preferred choice for general-purpose logic-level translation where both reliability and layout simplicity are critical.
Availability
DDTC124XE-7 is available at Aetrix Electronics and suitable for LED indicator control, microcontroller GPIO expansion, and low-power sensor enable switching requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for DDTC124XE-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, specializing in high-reliability, energy-efficient components for industrial, computing, consumer, and automotive markets.
This part belongs to the DDTC (R1≠R2 Series) pre-biased transistor family, engineered specifically to replace discrete BJT + resistor combinations in digital interface circuits - prioritizing board space reduction, assembly yield, and consistent switching behavior across temperature and process variation.
FAQ
What is the maximum continuous collector current for DDTC124XE-7?
The absolute maximum continuous collector current is 50 mA, verified per the DS30314 datasheet Absolute Maximum Ratings table. This rating assumes operation at TA = +25°C with proper PCB thermal relief; derating applies above 25°C per the Figure 1 derating curve - e.g., ~35 mA at +85°C ambient.
Can DDTC124XE-7 be used with 1.8 V logic inputs?
No - its specified VI(on) is 1.4 V at IO = 2 mA, but typical turn-on occurs at ≥1.6 V under production tolerance. For reliable operation with 1.8 V logic, DDTC114YE-7-F (VI(on) = 1.3 V) is recommended, as confirmed by electrical characteristics tables in DS30314 Rev.10-2.
Is the SOT523 package compatible with standard reflow profiles?
Yes - the SOT523 package is rated for moisture sensitivity level 1 (MSL-1) per J-STD-020 and supports standard Pb-free reflow profiles (peak 260°C, 30 sec max). The matte tin plating ensures solderability per MIL-STD-202 Method 208, and the 0.002 g mass prevents tombstoning on fine-pitch layouts.
Does DDTC124XE-7 have automotive qualification?
The base DDTC124XE-7 is not AEC-Q101 qualified, but Diodes offers an automotive-grade variant (DDTC124XE-7Q) manufactured in IATF 16949-certified facilities and PPAP-capable. Per Diodes' product definitions page, automotive qualification requires explicit part number suffix 'Q' and change-controlled documentation.
DDTC124XE-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:
- -
DDTC124XE-7 FAQ
1.How can I place an order for DDTC124XE-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC124XE-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 DDTC124XE-7 reliable?
The price and inventory of DDTC124XE-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC124XE-7 is usually 5 days.
3.What payment methods are accepted for DDTC124XE-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC124XE-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC124XE-7?
DDTC124XE-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC124XE-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 DDTC124XE-7?
For technical support, including DDTC124XE-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC124XE-7 requirements.
6.How does Aetrix verify that DDTC124XE-7 is sourced from the original manufacturer or authorized distributors?
All DDTC124XE-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 DDTC124XE-7 meets industry standards.
7.What is the process for return or replacement of DDTC124XE-7?
All DDTC124XE-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC124XE-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 DDTC124XE-7 part is unused and in its original packaging.
Return procedure for DDTC124XE-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDTC124XE-7 Tags
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MUN5211T1G
onsemi
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DTC043ZEBTL
Rohm Semiconductor
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DTC114EKAT146
Rohm Semiconductor
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DDTD113ZC-7-F
Diodes Incorporated
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DRDNB16W-7
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PDTC114ET,215
Nexperia USA Inc.
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PDTC143ZT,215
Nexperia USA Inc.
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PDTC143ET,215
Nexperia USA Inc.
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PDTC143XT,215
Nexperia USA Inc.
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MMUN2211LT1G
onsemi
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PDTC144ET,215
Nexperia USA Inc.
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PDTC124ET,215
Nexperia USA Inc.
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