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Diodes Incorporated 2DA2018-7
- Part No.:
- 2DA2018-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SOT-523
- Datasheet:
-
2DA2018-7.pdf
- Description:
- TRANS PNP 12V 0.5A SOT-523
- Quantity:
- Payment:
- Shipping:
Inventory:7,411
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Product details
Overview
2DA2018-7 from Diodes Incorporated is a PNP bipolar junction transistor in SOT-523 package, rated for -12 V VCEO, -500 mA IC, and ultra-low -250 mV VCE(sat) at IC = -200 mA / IB = -10 mA. It serves as a high-efficiency switching element in compact DC-DC converters and portable power management units.
For engineers reviewing the 2DA2018-7 datasheet, 2DA2018-7 pinout, 2DA2018-7 application, or 2DA2018-7 equivalent, key selection criteria include its low saturation voltage, AEC-Q101 qualification, SOT-523 footprint compatibility, and thermal performance under pulsed switching conditions in space-constrained designs.
Technical Context
This PNP transistor operates with a minimum DC current gain (hFE) of 270 at VCE = -2 V and IC = -10 mA, and delivers fT = 260 MHz for moderate-frequency switching. Its ESD robustness includes 4,000 V HBM and 400 V MM ratings.
The device exhibits tight VCE(sat) consistency across temperature (–55°C to +150°C) and supports pulsed operation up to 1 A ICM. Thermal resistance RθJA is 833°C/W on FR-4 PCB with minimum pad layout, enabling reliable operation in thermally constrained portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -12 V - Maximum safe collector-emitter reverse bias before breakdown in switching-off state |
| IC (cont.) | -500 mA - Continuous collector current handling capacity without thermal runaway on standard PCB |
| VCE(sat) | -250 mV @ IC = -200 mA / IB = -10 mA - Enables <0.05 W conduction loss per switch in high-duty-cycle DC-DC stages |
| hFE | 270–680 - Supports stable base drive design across production lots and temperature range (-55°C to +150°C) |
| fT | 260 MHz - Sufficient for PWM control up to ~50 MHz fundamental frequency in compact converter topologies |
| RθJA | 833°C/W - Requires careful thermal pad layout to maintain TJ < 150°C at full load in SOT-523 |
Pinout & Package
Package: SOT-523 - ultra-small surface-mount plastic case (1.60 × 1.60 × 0.75 mm), UL 94V-0 rated, moisture sensitivity level 1, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail; sets reference for base drive and current sourcing path |
| B (Base) | Control input for minority-carrier injection | Requires negative bias relative to emitter to turn on; low IB enables efficient drive from MCU GPIO or logic-level shifter |
| C (Collector) | Current sink terminal | Connected to load/inductor node; low VCE(sat) minimizes dropout and heat generation during conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | -250 mV at rated IC/IB - reduces conduction loss by >40% vs. standard PNP transistors in 3.3 V–5 V power rails |
| AEC-Q101 qualified | Qualified for automotive-grade reliability - supports use in infotainment power supplies and body electronics where extended temperature and lifetime validation are required |
| SOT-523 footprint | 1.6 mm × 1.6 mm outline - enables placement in <2 mm² board area, critical for wearables and hearing aids |
| Green compound | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets IPC-1752A Class 1 reporting and EU environmental compliance mandates |
Applications
| DC-DC Buck Converter | USB-C Power Delivery Sink |
|---|---|
|
Use Scenario: High-efficiency synchronous buck stage in portable battery-powered devices requiring <5 mm² solution size. IC Role / Device Role: Low-side PNP switch replacing Schottky diode in asynchronous configuration or assisting gate control in hybrid topology. Use Value: VCE(sat) ≤ 250 mV cuts conduction loss by 3× versus 0.7 V diode drop at 200 mA, extending runtime in 3.7 V Li-ion systems. |
Use Scenario: VBUS discharge path and overvoltage protection enable/disable in USB-C PD sink controllers. IC Role / Device Role: Fast-turn-off PNP switch controlling pull-down resistor network to ground VBUS during disconnect or fault events. Use Value: toff = 106 ns and ts = 87 ns ensure sub-200 ns total discharge latency, meeting USB PD 3.1 fast role swap timing requirements. |
| Portable Medical Sensor Node | Industrial IoT Edge Controller |
|
Use Scenario: Power gating of analog front-end (AFE) and RF transceiver modules in battery-operated pulse oximeters. IC Role / Device Role: Load switch isolating subsystems during sleep mode to reduce quiescent current below 1 µA. Use Value: ICBO ≤ 20 nA at 25°C and ≤ 50 µA at 150°C ensures leakage-induced wake-up is suppressed across operating temperature range. |
Use Scenario: Local 5 V/3.3 V regulator enable control and reset signal inversion in DIN-rail mounted PLC I/O modules. IC Role / Device Role: Level-shifting inverter driving EN pins of LDOs or resetting microcontroller watchdog inputs. Use Value: hFE ≥ 270 at IC = -10 mA guarantees robust logic-level inversion even with aging or voltage droop in industrial 24 V supply environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DXT2018-7 | Same die, identical VCE(sat), hFE, and fT; differs only in tape-and-reel packaging (7″ reel, 3,000 pcs) and marking code (KTF → KTF2) | No functional difference; used interchangeably in same PCB layouts and BOMs | Select when sourcing from alternate Diodes distribution channels with different reel configurations |
| MMBT2907ALT1G | Higher VCEO (-60 V), larger SOT-23 package, VCE(sat) = -400 mV @ same IC/IB, RθJA = 300°C/W | Supports higher-voltage rails but occupies 3× more board area and dissipates 60% more heat at same current | Choose only if system requires >12 V blocking or legacy SOT-23 compatibility; not drop-in for space-constrained designs |
Compared with DXT2018-7, 2DA2018-7 offers identical electrical performance with standardized marking; versus MMBT2907ALT1G, it trades voltage headroom for 60% smaller footprint and 40% lower conduction loss-critical for miniaturized battery-powered systems.
Availability
2DA2018-7 is available at Aetrix Electronics and suitable for DC-DC converters, portable medical sensors, and industrial IoT edge controllers requiring stable component supply despite its obsolete status through controlled legacy allocation.
Supply support for 2DA2018-7 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The 2DA2018 belongs to Diodes' "Low-Voltage Power Transistor" product line, engineered specifically for high-efficiency, space-constrained power switching in portable and automotive electronics where thermal density and footprint are primary constraints.
FAQ
Is 2DA2018-7 still in active production?
No-2DA2018-7 is officially obsolete and discontinued per Diodes' DS31823 Rev. 5 (June 2021). However, Aetrix Electronics maintains allocated legacy inventory with full traceability and provides last-time-buy support, including batch-specific test reports and RoHS/REACH documentation.
What is the maximum allowable ambient temperature for continuous operation at 500 mA?
At IC = -500 mA, power dissipation reaches ~125 mW (using VCE(sat) ≈ 250 mV). With RθJA = 833°C/W, ΔT = 104°C; thus, maximum ambient temperature is 46°C to keep junction at 150°C. Derating above 25°C is mandatory per Figure 1 in the datasheet.
Can 2DA2018-7 replace a generic SOT-23 PNP transistor in an existing design?
No-SOT-523 (2DA2018-7) and SOT-23 footprints are mechanically incompatible. Pad layout, solder stencil, and pick-and-place tooling differ significantly. Migration requires PCB revision, though electrical behavior may be similar if VCEO, IC, and VCE(sat) meet target specs.
Does the AEC-Q101 qualification apply to the -7 tape-and-reel variant?
Yes-the "AEC-Q101 KTF" marking in the Ordering Information table confirms that the 2DA2018-7 variant underwent full AEC-Q101 stress testing (including HTSL, TC, UHAST, and ESD), and qualification applies to all packaging variants sharing the same die and assembly process.
2DA2018-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 12 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 10mA, 200mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 270 @ 10mA, 2V
- Power - Max:
- 150 mW
- Frequency - Transition:
- 260MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-523
2DA2018-7 FAQ
1.How can I place an order for 2DA2018-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2DA2018-7 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 2DA2018-7 reliable?
The price and inventory of 2DA2018-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2DA2018-7 is usually 5 days.
3.What payment methods are accepted for 2DA2018-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2DA2018-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2DA2018-7?
2DA2018-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2DA2018-7 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 2DA2018-7?
For technical support, including 2DA2018-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2DA2018-7 requirements.
6.How does Aetrix verify that 2DA2018-7 is sourced from the original manufacturer or authorized distributors?
All 2DA2018-7 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 2DA2018-7 meets industry standards.
7.What is the process for return or replacement of 2DA2018-7?
All 2DA2018-7 units undergo pre-shipment inspection (PSI). If there is an issue with 2DA2018-7, 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 2DA2018-7 part is unused and in its original packaging.
Return procedure for 2DA2018-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2DA2018-7 Tags
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