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Diodes Incorporated DDTD143EU-7-F
- Part No.:
- DDTD143EU-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
DDTD143EU-7-F.pdf
- Description:
- TRANS PREBIAS NPN 50V SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
DDTD143EU-7-F from Diodes Incorporated is an NPN pre-biased transistor in SOT323 package, featuring integrated 4.7kΩ base-emitter and base-collector bias resistors. It delivers VI(ON) = 3.0V at IO = 20mA, VCE(sat) ≤ 0.3V at IC = 50mA/IB = 2.5mA, and DC current gain GL = 47, enabling reliable digital switching in low-voltage logic interface circuits.
For engineers reviewing the DDTD143EU-7-F datasheet, DDTD143EU-7-F pinout, DDTD143EU-7-F application, or DDTD143EU-7-F equivalent, key selection criteria include input threshold voltage compatibility with 3.3V/5V logic families, saturation performance under 50mA load, thermal derating on FR4 PCBs, and SOT323 footprint constraints for high-density layouts.
Technical Context
This device integrates two precision 4.7kΩ resistors to configure a fixed-current-driven NPN switch, eliminating external bias components. Its VI(OFF) = 0.5V ensures noise immunity against sub-0.8V logic glitches, while VI(ON) = 3.0V aligns with standard CMOS/TTL high-level thresholds.
The SOT323 package provides 250mW power dissipation at TA = 25°C with RθJA = 500°C/W, requiring careful thermal design above 70°C ambient. Absolute maximum ratings include VCC = 50V, VEBO = 5V, and IC = 500mA peak, supporting robust operation in industrial control signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VI(ON) | 3.0V at VO = 0.3V, IO = 20mA - Ensures clean turn-on with standard 3.3V logic outputs |
| VCE(sat) | ≤0.3V at IC = 50mA, IB = 2.5mA - Minimizes conduction loss in load-switching applications |
| GL | 47 - Provides stable current amplification for predictable switching margins |
| R1, R2 | 4.7kΩ each - Enables single-resistor-equivalent bias network without external parts |
| PD | 250mW on FR4 PCB - Defines maximum continuous power handling before thermal shutdown |
| VCC(max) | 50V - Supports operation across 12V, 24V, and 48V industrial bus systems |
Pinout & Package
Package: SOT323 - ultra-small surface-mount plastic package (2.15mm × 2.10mm × 0.95mm), moisture sensitivity level 1, matte tin-plated leads, 0.006g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; defines reference for input voltage threshold |
| 2 (Base) | Bias resistor junction node | Internal connection point between R1 and R2; accepts logic-level input signals |
| 3 (Collector) | Switched output terminal | Drives loads up to 50mA; requires external pull-up or direct connection to supply rail |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual 4.7kΩ bias resistors | Eliminates 2 external SMT resistors, reducing BOM count and layout area by ~1.5mm² |
| VI(OFF) = 0.5V | Rejects noise below 0.8V, preventing false triggering in electrically noisy environments |
| SOT323 package with J-STD-020 Level 1 rating | Enables reflow soldering without moisture preconditioning, simplifying manufacturing |
| Lead-free, halogen-free, RoHS 3 compliant | Meets automotive and industrial environmental compliance requirements without exemptions |
Applications
| Industrial PLC Input Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Isolating 24V field sensor signals into 3.3V microcontroller GPIO inputs. IC Role / Device Role / Timing Role: NPN pre-biased switch converting high-voltage industrial logic to safe MCU-compatible levels. Use Value: Eliminates need for discrete resistor divider + transistor, reducing component count and improving ESD robustness via integrated bias network. |
Use Scenario: Driving LED status indicators from CAN/LIN transceiver interrupt outputs. IC Role / Device Role / Timing Role: Low-power digital switch interfacing between communication ICs and indicator loads. Use Value: Delivers 20mA drive at <0.3V saturation with 3.0V input threshold, ensuring compatibility with LIN bus logic levels. |
| Consumer Appliance Control Panels | Medical Device Button Interfaces |
Use Scenario: Debouncing mechanical push-button signals before feeding to ARM Cortex-M0+ processors. IC Role / Device Role / Timing Role: Edge-triggered digital buffer with built-in hysteresis via resistor ratio. Use Value: Achieves 0.5V–3.0V input window for reliable contact bounce rejection without external RC networks. |
Use Scenario: Safe isolation of patient-accessible button inputs from main system logic. IC Role / Device Role / Timing Role: Current-limited, low-leakage signal translator meeting IEC 60601 creepage requirements. Use Value: Maintains IO(OFF) ≤ 0.5µA at 50V reverse bias, minimizing leakage current in safety-critical paths. |
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 |
|---|---|---|---|
| DDTD123EU-7-F | R1/R2 = 2.2kΩ (lower input impedance, higher IL = 7.2mA at 5V) | Better suited for faster switching with lower propagation delay but higher static current draw | Select when driving capacitive loads >100pF or requiring tPLH/tPHL < 15ns |
| DDTD113ZU-7-F | R1 = 1kΩ, R2 = 10kΩ (asymmetric bias, VI(ON) = 3.0V, IL = 28mA at 5V) | Higher input current enables stronger drive into heavy logic fan-out but increases power consumption | Choose for legacy 74HC-series TTL loads requiring ≥20mA input drive capability |
Compared with DDTD143EU-7-F, DDTD123EU-7-F offers faster switching at the cost of 2× higher input current, while DDTD113ZU-7-F supports heavier logic loads but consumes 4× more quiescent power-making DDTD143EU-7-F optimal for battery-powered or thermally constrained designs needing balanced speed-efficiency trade-offs.
Availability
DDTD143EU-7-F is available at Aetrix Electronics and suitable for industrial PLC input modules, automotive body control units, and consumer appliance control panels requiring stable component supply and long-term obsolescence management.
Supply support for DDTD143EU-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 industrial, automotive, and computing markets since 1960.
This part belongs to the DDTD series of pre-biased transistors designed specifically for space-constrained digital interface applications where board area, assembly cost, and signal integrity are critical design constraints.
FAQ
What is the maximum continuous collector current for DDTD143EU-7-F?
The absolute maximum collector current is 500mA per the datasheet's Absolute Maximum Ratings table. However, the recommended operating limit is 50mA at TA = 25°C due to thermal constraints-exceeding this requires derating per the 500°C/W RθJA curve, with power dissipation capped at 250mW on standard FR4 PCBs.
Can DDTD143EU-7-F be used with 1.8V logic inputs?
No-its VI(ON) is specified at 3.0V minimum with IO = 20mA, and VI(OFF) is only 0.5V. A 1.8V input falls within the undefined transition region and will not reliably saturate the transistor; use DDTD122JU-7-F (VI(ON) = 5V, VI(OFF) = 0.5V) or discrete biasing for 1.8V systems.
Is DDTD143EU-7-F qualified for automotive applications?
No-the datasheet explicitly states that automotive qualification (AEC-Q100/101) requires contacting Diodes directly for PPAP-capable parts; DDTD143EU-7-F is listed as Obsolete in the ordering table and lacks AEC documentation, making it suitable only for industrial and commercial applications.
What is the thermal resistance of DDTD143EU-7-F on a standard PCB?
RθJA is 500°C/W when mounted on a 1oz single-sided FR4 PCB with minimum recommended pad layout (C = 0.65mm, G = 1.30mm). This value increases significantly with smaller copper areas or double-sided boards lacking thermal vias-designers must apply the derating curve starting at 70°C ambient to maintain safe junction temperatures.
DDTD143EU-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Pre-Biased
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 4.7 kOhms
- Resistor - Emitter Base (R2):
- 4.7 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 47 @ 50mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 2.5mA, 50mA
- Current - Collector Cutoff (Max):
- 500nA
- Frequency - Transition:
- 200 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
DDTD143EU-7-F FAQ
1.How can I place an order for DDTD143EU-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTD143EU-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 DDTD143EU-7-F reliable?
The price and inventory of DDTD143EU-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 DDTD143EU-7-F is usually 5 days.
3.What payment methods are accepted for DDTD143EU-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTD143EU-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTD143EU-7-F?
DDTD143EU-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTD143EU-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 DDTD143EU-7-F?
For technical support, including DDTD143EU-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTD143EU-7-F requirements.
6.How does Aetrix verify that DDTD143EU-7-F is sourced from the original manufacturer or authorized distributors?
All DDTD143EU-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 DDTD143EU-7-F meets industry standards.
7.What is the process for return or replacement of DDTD143EU-7-F?
All DDTD143EU-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTD143EU-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 DDTD143EU-7-F part is unused and in its original packaging.
Return procedure for DDTD143EU-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDTD143EU-7-F Tags
-
MUN5211T1G
onsemi
-
DTC043ZEBTL
Rohm Semiconductor
-
DTC114EKAT146
Rohm Semiconductor
-
DDTD113ZC-7-F
Diodes Incorporated
-
DRDNB16W-7
Diodes Incorporated
-
PDTC114ET,215
Nexperia USA Inc.
-
PDTC143ZT,215
Nexperia USA Inc.
-
PDTC143ET,215
Nexperia USA Inc.
-
PDTC143XT,215
Nexperia USA Inc.
-
MMUN2211LT1G
onsemi
-
PDTC144ET,215
Nexperia USA Inc.
-
PDTC124ET,215
Nexperia USA Inc.
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