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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated ZXT11N20DFTA

Name: ZXT11N20DFTA
Brand: Diodes Incorporated
SKU: ZXT11N20DFTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXT11N20DFTA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZXT11N20DFTA.pdf

Description:: TRANS NPN 20V 2.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,565

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Product details

Overview

ZXT11N20DFTA from Diodes Incorporated is a 20V NPN low-saturation bipolar junction transistor in SOT23 package, rated for 2.5A continuous collector current, with V_CE(sat) ≤ 12 mV at I_C = 100 mA / I_B = 10 mA, and R_sat = 40 mΩ - optimized for high-efficiency DC-DC converter power switches and motor control stages.

For engineers reviewing the ZXT11N20DFTA datasheet, ZXT11N20DFTA pinout, ZXT11N20DFTA application, or ZXT11N20DFTA equivalent, key selection criteria include saturation voltage at high current, thermal resistance (R_θJA = 155 °C/W under short-pulse conditions), h_FE stability across 10 mA–2.5 A, and SOT23 footprint compatibility with space-constrained power management PCBs.

Technical Context

This NPN transistor operates as a low-loss switching element in saturated mode, leveraging high DC current gain (h_FE ≥ 100 up to I_C = 5 A) and fast switching (t_on = 122 ns, t_off = 295 ns) for pulse-width modulated power stages. Its 20 V V_CEO rating targets 12 V rail applications with margin.

Designed for surface-mount use on FR4 PCBs with single-sided 1 oz copper, it delivers 806 mW power dissipation (t < 5 s) and 625 mW steady-state capability, with thermal resistance dependent on layout and pulse duration per JESD51-2.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum safe collector-emitter voltage in active switching; sets upper limit for 12 V system bus operation with headroom.
I_C (continuous)	2.5 A - Continuous current handling capacity; supports compact load switching without external heatsinking in ambient ≤ +70°C.
V_CE(sat)	12 mV @ 100 mA/10 mA - Ultra-low saturation voltage minimizes conduction loss in high-duty-cycle DC-DC topologies.
h_FE	100–900 - Wide DC current gain range ensures reliable base drive design across operating currents from 10 mA to 5 A.
R_θJA	155 °C/W (t < 5 s) - Thermal resistance under transient conditions; enables short-burst high-power operation without thermal runaway.
f_T	160 MHz - Transition frequency confirms suitability for switching above 100 kHz with controlled turn-on/turn-off behavior.

Pinout & Package

Package: SOT23 - Surface-mount plastic package (2.4 mm × 1.3 mm × 1.0 mm), RoHS-compliant, halogen-free, matte tin-plated leads, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance return path; connected to ground or low-side reference in common-emitter switch configurations.
2 (Base)	Control input	Receives current-limited drive signal; requires ~250 mA peak base current for full saturation at I_C = 2.5 A.
3 (Collector)	Current source terminal	Connected to load or supply rail; carries switched output current with minimal V_CE(sat) drop.

Key Features

Feature	Design Value
Ultra-low V_CE(sat)	12 mV at 100 mA - Reduces conduction loss by >50% vs. standard BJT alternatives in 12 V buck converters.
High current capability	2.5 A continuous - Enables single-device replacement of dual-transistor or MOSFET+driver solutions in space-constrained motor drivers.
Fast switching	t_on/t_off = 122/295 ns - Supports PWM frequencies up to 500 kHz while maintaining efficiency and minimizing switching loss.
Thermal robustness	R_θJA = 155 °C/W (short pulse) - Allows brief overloads (e.g., motor startup surges) without derating or thermal shutdown.

Applications

DC-DC Converters

Power Management Functions

Use Scenario: Step-down regulation in portable industrial sensors powered from 12 V battery rails.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch in non-isolated buck converter topology.

Use Value: 12 mV V_CE(sat) cuts conduction loss to <15 mW at 100 mA, extending battery life by >8% vs. standard BJTs.

Use Scenario: Load switching for FPGA core voltage sequencing in edge AI modules.

IC Role / Device Role / Timing Role: High-current enable switch controlling 1.2 V/2 A supply rail during power-up sequence.

Use Value: 2.5 A rating and 40 mΩ R_sat ensure <30 mV dropout at full load, preserving tight voltage tolerance.

Power Switches

Motor Controls

Use Scenario: Solid-state relay replacement in HVAC damper actuator control boards.

IC Role / Device Role / Timing Role: Single-pole, high-side or low-side power switch driving 24 V/1.5 A brushed DC motors.

Use Value: 20 V V_CEO and 2.5 A I_C support direct interface to 24 V nominal systems with 20% transient margin.

Use Scenario: Directional H-bridge half-bridge leg in small robotic joint controllers.

IC Role / Device Role / Timing Role: Complementary NPN switch paired with PNP counterpart for bidirectional 12 V motor drive.

Use Value: Matched f_T (160 MHz) and fast t_off (295 ns) minimize shoot-through risk during commutation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-saturation transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
FMMT618	V_CEO = 20 V, I_C = 3 A, V_CE(sat) = 150 mV @ 1 A - higher saturation voltage, lower gain at low current.	Targeted at higher-voltage, lower-frequency switching where ultra-low V_CE(sat) is less critical.	Preferred when board-level thermal design accommodates higher conduction loss and legacy FMMT618 footprint reuse is required.
ZXTN2020Z	V_CEO = 20 V, I_C = 2 A, V_CE(sat) = 100 mV @ 1 A - lower current rating, higher V_CE(sat), same SOT23 package.	Used in cost-sensitive consumer power management where 2 A suffices and tighter V_CE(sat) tolerance is not needed.	Select when BOM consolidation favors Diodes' ZXTN series and 2 A maximum load is confirmed.

Compared with FMMT618 and ZXTN2020Z, ZXT11N20DFTA delivers the lowest V_CE(sat) (12 mV) and highest continuous current (2.5 A) in SOT23, making it optimal for thermally constrained, high-efficiency 12–24 V power switches - though discontinued, its performance remains unmatched in this package class.

Availability

ZXT11N20DFTA is available at Aetrix Electronics and suitable for DC-DC converters, power-management functions, and motor controls requiring stable component supply despite its obsolete status - supported via last-time-buy inventory and cross-reference assistance.

Supply support for ZXT11N20DFTA 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.

The ZXT series targets high-performance, low-saturation bipolar transistors for space-constrained power switching applications - emphasizing minimal conduction loss, fast switching, and robust thermal behavior in miniature packages like SOT23.

FAQ

Is ZXT11N20DFTA still in production?

No - Diodes Incorporated has officially discontinued ZXT11N20DFTA (marked OBSOLETE in DS33629 Rev. 3–4). Aetrix Electronics maintains limited legacy stock and supports transition to FMMT618 or ZXTN2020Z with full parametric validation and footprint compatibility analysis.

What is the maximum safe operating temperature for ZXT11N20DFTA?

The device supports junction temperatures from –55°C to +150°C. For continuous operation at 2.5 A, ambient must remain ≤ +70°C on a 25 mm × 25 mm FR4 board with 1 oz copper, based on R_θJA = 200 °C/W (steady-state) and PD = 625 mW derating.

Can ZXT11N20DFTA replace a MOSFET in low-voltage switching?

Yes - in 12–24 V applications where gate drive complexity or cost is prohibitive, its 12 mV V_CE(sat) and 2.5 A rating provide MOSFET-like conduction efficiency without requiring level-shifting or high-current gate drivers, though with base current overhead (~10% of I_C).

Does ZXT11N20DFTA meet automotive qualification standards?

No - the datasheet explicitly states that ZXT11N20DFTA is not AEC-Q101 qualified. For automotive use, Diodes recommends contacting their representatives for PPAP-capable, IATF 16949-manufactured alternatives such as the FMMT618Q or ZXTN25040DFH.

ZXT11N20DFTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2.5 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 130mV @ 250mA, 2.5A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 100mA, 2V

Power - Max:: 625 mW

Frequency - Transition:: 160MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZXT11N20DFTA FAQ

1.How can I place an order for ZXT11N20DFTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXT11N20DFTA 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 ZXT11N20DFTA reliable?

The price and inventory of ZXT11N20DFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXT11N20DFTA is usually 5 days.

3.What payment methods are accepted for ZXT11N20DFTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXT11N20DFTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXT11N20DFTA?

ZXT11N20DFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXT11N20DFTA 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 ZXT11N20DFTA?

For technical support, including ZXT11N20DFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXT11N20DFTA requirements.

6.How does Aetrix verify that ZXT11N20DFTA is sourced from the original manufacturer or authorized distributors?

All ZXT11N20DFTA 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 ZXT11N20DFTA meets industry standards.

7.What is the process for return or replacement of ZXT11N20DFTA?

All ZXT11N20DFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXT11N20DFTA, 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 ZXT11N20DFTA part is unused and in its original packaging.

Return procedure for ZXT11N20DFTA:

1.Submit a request within 90 days.

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

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