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

Diodes Incorporated DXTN5840CFDB-7

Name: DXTN5840CFDB-7
Brand: Diodes Incorporated
SKU: DXTN5840CFDB-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DXTN5840CFDB-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: 3-UDFN Exposed Pad

Datasheet:: DXTN5840CFDB-7.pdf

Description:: TRANS NPN 40V 5A UDFN2020-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,990

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Product details

Overview

DXTN5840CFDB-7 from Diodes Incorporated is a 40V NPN low-saturation transistor in U-DFN2020-3 (Type B) package, designed for high-current switching with V_CE(sat) as low as 10 mV at I_C = 0.1 A / I_B = 10 mA, h_FE ≥ 200 up to 3 A, and rated for 5 A continuous collector current. It serves as a power switch in DC-DC converters, motor control stages, and battery charging circuits where low conduction loss and thin-profile mounting are critical.

For engineers reviewing the DXTN5840CFDB-7 datasheet, DXTN5840CFDB-7 pinout, DXTN5840CFDB-7 application, or DXTN5840CFDB-7 equivalent, key selection criteria include its 40 V BV_CEO, 0.6 mm profile, JEDEC-qualified reliability, and validated performance under pulsed and DC conditions per DS42184 Rev. 1–2.

Technical Context

This NPN transistor features a planar epitaxial die structure optimized for low V_CE(sat) across 0.1–4 A load range, with h_FE maintained ≥180 at I_C = 3 A and ≥190 at I_C = 4 A. Its U-DFN2020-3 (Type B) package integrates an exposed collector pad for thermal dissipation, enabling 0.69 W power handling on 5 mm × 5 mm 2 oz copper FR4.

It meets JEDEC reliability standards referenced in AEC-Q, supports 4 kV HBM ESD rating, and operates from –55 °C to +150 °C. The device is not automotive-qualified by default (Q-suffix required), but shares identical silicon and package construction with qualified variants.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Ensures safe operation in 24 V and 36 V bus systems with margin against transients.
V_CE(sat) @ I_C=1A	45–75 mV - Reduces conduction loss to ≤75 mW at 1 A, critical for thermally constrained DC-DC stages.
h_FE @ I_C=3A	180–220 - Maintains sufficient current gain for base drive efficiency in high-current motor gate drivers.
P_D (on 5×5 mm 2 oz Cu)	0.69 W - Enables 1.25 mW/°C derating up to +125 °C ambient without heatsink.
R_θJA	180 °C/W - Confirmed for standard single-sided FR4 layout; drops to 100 °C/W with 25 mm × 25 mm 1 oz Cu.
f_T	150 MHz - Supports fast switching in PWM frequencies up to ~10 MHz with adequate gain margin.
ESD HBM	4,000 V - Provides robustness against handling-induced discharge in automated assembly lines.

Pinout & Package

U-DFN2020-3 (Type B) package: 2.0 mm × 2.0 mm footprint, 0.6 mm nominal height, exposed collector pad (pin 3), NiPdAu-plated terminals, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; requires low-inductance routing for switching stability.
2 (Base)	Control input	Driven with 10–40 mA base current to achieve specified saturation; requires series resistor for current limiting.
3 (Collector)	Power output terminal	Exposed pad functions as primary thermal path and high-current output node; must be soldered to PCB copper pour.

Key Features

Feature	Design Value
Low saturation voltage	V_CE(sat) ≤ 145 mV at I_C = 3 A / I_B = 30 mA - minimizes power loss in high-current linear or quasi-saturated operation.
High-current h_FE specification	h_FE ≥ 180 at I_C = 3 A - ensures predictable base drive requirements without gain collapse under load.
Ultra-thin 0.6 mm profile	Enables use in space-constrained portable electronics and stacked PCB assemblies where Z-height is limited.
JEDEC-qualified reliability	Validated per AEC-Q stress test references - provides confidence in long-term operation for industrial-grade designs.
Green, halogen-free construction	<900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets IPC-1752a reporting requirements and RoHS 3 compliance.

Applications

DC-DC Converters

Charging Circuits

Use Scenario: Synchronous rectification or primary-side switching in buck converters delivering 3–5 A at 5–12 V output.

IC Role / Device Role / Timing Role: Low-side NPN switch replacing MOSFETs where gate drive complexity or cost must be minimized.

Use Value: 45 mV V_CE(sat) at 1 A reduces conduction loss by >30% versus comparable bipolar transistors, improving efficiency at light-to-moderate loads.

Use Scenario: Constant-current battery charge control stage for Li-ion or lead-acid packs in portable power tools and UPS units.

IC Role / Device Role / Timing Role: Linear pass element regulated via feedback loop to maintain precise charge current.

Use Value: Stable h_FE ≥ 200 up to 2 A enables accurate current mirroring with minimal base current error, supporting ±2% charge regulation.

Motor Control

Power Switches

Use Scenario: H-bridge low-side driver for brushed DC motors in automotive HVAC actuators and industrial valves.

IC Role / Device Role / Timing Role: High-current saturated switch controlling motor winding current direction and magnitude.

Use Value: 3 A continuous rating with 195 mV V_CE(sat) at 2 A limits junction temperature rise to <45 °C above ambient under typical PCB layout, avoiding thermal shutdown.

Use Scenario: Solid-state replacement for electromechanical relays in programmable logic controller (PLC) output modules.

IC Role / Device Role / Timing Role: Load-switching transistor interfacing microcontroller GPIO to 24 V industrial loads.

Use Value: 40 V BV_CEO and 4 kV HBM withstand capability ensure immunity to inductive kickback and ESD events in factory-floor environments.

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
ZXTN25040DFH	Same U-DFN2020-3 package; higher V_CEO = 45 V; lower V_CE(sat) = 30 mV @ 1 A; h_FE min 250 @ 1 A.	Better suited for 40 V rail systems requiring tighter saturation tolerance; slightly higher cost.	Select when <40 mV V_CE(sat) is mandatory and 45 V rating adds system margin.
DMT3006LPS-7	SO-8 package (larger footprint); V_CEO = 30 V; V_CE(sat) = 45 mV @ 1 A; h_FE min 150 @ 3 A.	Offers higher power dissipation (1.25 W) but incompatible with ultra-thin layouts; requires different PCB land pattern.	Choose when thermal budget exceeds 0.69 W and board space allows SO-8 mounting.

Compared with ZXTN25040DFH and DMT3006LPS-7, DXTN5840CFDB-7 delivers optimal balance of thin profile, 40 V rating, and proven 3 A h_FE stability-making it preferred for compact, cost-sensitive industrial power switches where 0.6 mm height is non-negotiable.

Availability

DXTN5840CFDB-7 is available at Aetrix Electronics and suitable for DC-DC converters, battery charging circuits, and motor control applications requiring stable component supply, JEDEC-reliable performance, and ultra-low-profile packaging.

Supply support for DXTN5840CFDB-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

DXTN5840CFDB-7 belongs to Diodes' low-saturation bipolar transistor product line, engineered specifically for high-efficiency, space-constrained power switching in industrial and consumer power management systems.

FAQ

Is DXTN5840CFDB-7 qualified for automotive applications?

No-DXTN5840CFDB-7 is not AEC-Q101 qualified. Diodes offers automotive-grade equivalents with Q-suffix (e.g., DXTN5840CFDBQ-7), which undergo PPAP, IATF 16949 manufacturing, and full AEC-Q101 stress testing. This part is intended for industrial and commercial use only.

What is the recommended PCB pad layout for U-DFN2020-3 (Type B)?

Per Diodes' package outline DS42184, the recommended footprint uses a 1.30 mm × 1.30 mm thermal pad centered under the package, with 0.35 mm × 1.52 mm solder mask openings for pins 1 and 2, and 0.50 mm × 0.47 mm openings for pin 1 and 2 lands. Thermal pad must connect to internal or external copper pour via ≥4 thermal vias.

Can DXTN5840CFDB-7 replace a MOSFET in low-side switching?

Yes-when gate drive simplicity and cost outweigh R_DS(on) advantages. Its 45 mV V_CE(sat) at 1 A equates to ~45 mΩ effective on-resistance, but requires ~100 mA base current versus MOSFET's gate capacitance-only drive. Best used where microcontroller GPIO can source sufficient base current and switching frequency is ≤100 kHz.

What is the maximum safe operating area (SOA) limitation at 100 °C ambient?

At T_A = 100 °C, derated power dissipation is 0.34 W (per 1.25 mW/°C linear derating from 0.69 W at 25 °C). SOA curves in DS42184 show that at V_CE = 20 V, maximum continuous I_C is ~1.7 A; at V_CE = 30 V, it drops to ~1.1 A-both values assume 5 mm × 5 mm 2 oz copper layout.

DXTN5840CFDB-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-UDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 350mV @ 30mA, 3A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 1A, 2V

Power - Max:: 690 mW

Frequency - Transition:: 150MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: U-DFN2020-3 (Type B)

DXTN5840CFDB-7 FAQ

1.How can I place an order for DXTN5840CFDB-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DXTN5840CFDB-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 DXTN5840CFDB-7 reliable?

The price and inventory of DXTN5840CFDB-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DXTN5840CFDB-7 is usually 5 days.

3.What payment methods are accepted for DXTN5840CFDB-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DXTN5840CFDB-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DXTN5840CFDB-7?

DXTN5840CFDB-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DXTN5840CFDB-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 DXTN5840CFDB-7?

For technical support, including DXTN5840CFDB-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DXTN5840CFDB-7 requirements.

6.How does Aetrix verify that DXTN5840CFDB-7 is sourced from the original manufacturer or authorized distributors?

All DXTN5840CFDB-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 DXTN5840CFDB-7 meets industry standards.

7.What is the process for return or replacement of DXTN5840CFDB-7?

All DXTN5840CFDB-7 units undergo pre-shipment inspection (PSI). If there is an issue with DXTN5840CFDB-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 DXTN5840CFDB-7 part is unused and in its original packaging.

Return procedure for DXTN5840CFDB-7:

1.Submit a request within 90 days.

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

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