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

Diodes Incorporated ZXT11N20DFTC

Name: ZXT11N20DFTC
Brand: Diodes Incorporated
SKU: ZXT11N20DFTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXT11N20DFTC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: ZXT11N20DFTC.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZXT11N20DFTC from Diodes Incorporated is a 20V NPN low-saturation transistor in SOT23 package, rated for 2.5A continuous collector current, with V_CE(sat) ≤ 12 mV at 100 mA / 10 mA drive and R_sat = 40 mΩ. It serves as a high-efficiency power switch in DC-DC converters and motor control stages where minimal conduction loss and fast switching are critical.

For engineers reviewing the ZXT11N20DFTC datasheet, ZXT11N20DFTC pinout, ZXT11N20DFTC application, or ZXT11N20DFTC equivalent, key selection criteria include verified V_CE(sat) performance at ≥1A, thermal resistance (R_θJA = 155 °C/W under short-pulse conditions), SOT23 footprint compatibility, and AEC-Q101 readiness for automotive power management.

Technical Context

This NPN bipolar junction transistor is optimized for low-voltage, high-current switching with tightly controlled saturation characteristics. Its BV_CEO = 20 V and I_C = 2.5 A rating support operation in 12 V automotive and industrial power rails, while f_T = 160 MHz enables use in medium-frequency PWM circuits.

The device employs epitaxial base construction and advanced die attach to achieve ultra-low V_CE(sat) across load ranges - 7 mV typical at 100 mA/10 mA, rising to 130 mV at 2.5 A/250 mA - and maintains h_FE ≥ 100 up to 5 A, ensuring stable gain in linear and saturated modes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum safe collector-emitter voltage in common-emitter configuration; defines upper limit for 12 V system rail switching.
I_C (continuous)	2.5 A - Continuous DC current handling capability; supports compact power switches without forced cooling.
V_CE(sat)	12 mV max @ 100 mA/10 mA - Enables <1.2 mW conduction loss at light loads; critical for standby efficiency in PMICs.
R_sat	40 mΩ - Equivalent on-resistance derived from V_CE(sat)/I_C; allows direct comparison with MOSFET R_DS(on) in switch design.
f_T	160 MHz - Transition frequency confirming suitability for PWM frequencies up to ~10–20 MHz with adequate gain margin.
R_θJA	155 °C/W - Thermal resistance under short-duration pulse test; informs transient thermal design for repetitive switching.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; lowest impedance node during saturation.
2 (Base)	Control input	Receives forward bias current (up to 500 mA) to drive transistor into saturation; requires current-limiting resistor.
3 (Collector)	Current source terminal	Connected to load and supply rail; carries full switched current; thermally coupled to package tab (no internal thermal pad).

Key Features

Feature	Design Value
Ultra-low V_CE(sat)	12 mV max at 100 mA ensures <1.2 mW static loss - extends battery life in portable DC-DC stages.
High current capability	2.5 A continuous rating enables replacement of larger SOT89/SOT223 devices in space-constrained PCB layouts.
Fast switching	t_on = 122 ns, t_off = 295 ns - supports >1 MHz PWM without significant dead-time penalty or shoot-through risk.
AEC-Q101 readiness	Manufactured in IATF 16949-certified facilities; supports PPAP documentation for automotive power modules.

Applications

DC-DC Converter Switch

Automotive Power Switch

Use Scenario: High-efficiency buck converter in infotainment power supply delivering 3.3 V/2 A from 12 V battery rail.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch replacing Schottky diode to reduce conduction loss.

Use Value: Achieves 0.8% efficiency gain over diode solution at 1 A load due to 12 mV V_CE(sat), lowering thermal stress on PCB.

Use Scenario: Load switch controlling 12 V power to HVAC blower motor in passenger compartment.

IC Role / Device Role / Timing Role: High-current NPN driver stage interfacing microcontroller GPIO to motor H-bridge enable input.

Use Value: Delivers 2.5 A base drive with <100 mV drop, ensuring robust turn-on of downstream MOSFETs under cold-cranking conditions.

Industrial Motor Control

Power Management IC (PMIC) Output Stage

Use Scenario: Directional control logic in 24 V stepper driver module for factory automation actuators.

IC Role / Device Role / Timing Role: Level-shifting and current amplification stage translating 3.3 V logic to 24 V gate drive signals.

Use Value: Maintains h_FE ≥ 150 at 1 A, enabling single-transistor drive of dual-MOSFET gates without cascaded stages.

Use Scenario: Secondary LDO pass element in multi-rail PMIC supplying FPGA core voltage.

IC Role / Device Role / Timing Role: Linear regulator series pass transistor operating in active region for precision output control.

Use Value: Low V_BE(sat) = 0.9 V ensures minimal dropout (≤1.2 V) at 2 A, preserving headroom for 1.8 V output from 3.3 V input.

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 @ 2 A/200 mA - higher saturation voltage but higher current rating.	Preferred for >2 A continuous switching where thermal margin outweighs ultra-low V_CE(sat) need.	Select FMMT618 when board layout allows slightly higher power dissipation and higher peak current is required.
ZXTN2020Z	V_CEO = 20 V, I_C = 2 A, V_CE(sat) = 100 mV @ 1 A/100 mA - lower current rating, higher V_CE(sat), same SOT23 footprint.	Suitable for cost-sensitive consumer power stages where 1 A load is sufficient and tighter BOM control is needed.	Choose ZXTN2020Z only if design operates ≤1 A and requires second-source availability with identical package.

Compared with ZXT11N20DFTC, FMMT618 trades 12 mV ultra-low saturation for +0.5 A current headroom and relaxed thermal design, while ZXTN2020Z sacrifices both current and saturation performance for broader distributor stock and simplified qualification - making ZXT11N20DFTC optimal for high-efficiency, space-constrained 2 A applications.

Availability

ZXT11N20DFTC is available at Aetrix Electronics and suitable for DC-DC converters, automotive power switches, and industrial motor controls requiring stable component supply despite its obsolete status - inventory is secured through authorized Diodes channel partners with full traceability.

Supply support for ZXT11N20DFTC 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 the Americas.

The ZXT series targets high-performance power switching applications, emphasizing ultra-low saturation voltage and robust thermal behavior in miniature packages for automotive, industrial, and computing power systems.

FAQ

Is ZXT11N20DFTC still in production?

No - Diodes Incorporated has officially discontinued ZXT11N20DFTC (marked OBSOLETE in DS33629 Rev. 3–4). However, Aetrix Electronics holds final-sale inventory with full traceability and offers engineering support for migration to FMMT618 or other qualified alternatives.

What is the maximum allowable base current for reliable operation?

The absolute maximum base current is 500 mA per datasheet Absolute Maximum Ratings. For sustained 2.5 A collector current, IB = 250 mA is specified; exceeding this without thermal derating risks bond wire failure or gain degradation due to localized heating at the base contact.

Can ZXT11N20DFTC be used in linear regulator applications?

Yes - its V_BE(sat) = 0.9 V typ at 2.5 A and h_FE ≥ 100 up to 5 A support stable linear regulation. However, power dissipation must be limited to ≤625 mW (derated above 25°C) using R_θJA = 200 °C/W for steady-state PCB mounting.

Does ZXT11N20DFTC meet AEC-Q101 requirements?

While not individually certified, it is manufactured in IATF 16949-certified facilities and qualifies for automotive use per Diodes' AEC-Q101 product definitions. Customers requiring formal PPAP must coordinate with Diodes' automotive team to obtain qualification documentation for this specific part number.

ZXT11N20DFTC 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

ZXT11N20DFTC FAQ

1.How can I place an order for ZXT11N20DFTC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXT11N20DFTC 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 ZXT11N20DFTC reliable?

The price and inventory of ZXT11N20DFTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXT11N20DFTC is usually 5 days.

3.What payment methods are accepted for ZXT11N20DFTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXT11N20DFTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXT11N20DFTC?

ZXT11N20DFTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXT11N20DFTC 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 ZXT11N20DFTC?

For technical support, including ZXT11N20DFTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXT11N20DFTC requirements.

6.How does Aetrix verify that ZXT11N20DFTC is sourced from the original manufacturer or authorized distributors?

All ZXT11N20DFTC 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 ZXT11N20DFTC meets industry standards.

7.What is the process for return or replacement of ZXT11N20DFTC?

All ZXT11N20DFTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXT11N20DFTC, 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 ZXT11N20DFTC part is unused and in its original packaging.

Return procedure for ZXT11N20DFTC:

1.Submit a request within 90 days.

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

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