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

Nexperia USA Inc. PMBT4401/S911,215

Name: PMBT4401/S911,215
Brand: Nexperia USA Inc.
SKU: PMBT4401/S911,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBT4401/S911,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PMBT4401/S911,215.pdf

Description:: TRANS NPN 40V 0.6A SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:51,000

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Product details

Overview

PMBT4401/S911,215 from Nexperia is an NPN general-purpose bipolar junction transistor (BJT) with 600 mA I_C, 40 V V_CEO, and 250 MHz f_T, housed in a SOT-23 surface-mount package. It serves as a medium-speed switching or linear amplification device in low-power signal paths of consumer and industrial control circuits.

For engineers reviewing the PMBT4401/S911,215 datasheet, PMBT4401/S911,215 pinout, PMBT4401/S911,215 application, or PMBT4401/S911,215 equivalent, key selection criteria include DC current gain consistency at 100 mA, safe operating area under pulsed conditions, thermal resistance in PCB-constrained layouts, and compatibility with 3.3 V/5 V logic-level drive.

Technical Context

This BJT operates in active or saturation mode depending on base drive and load configuration. Its h_FE ranges from 100 to 300 at I_C = 10 mA and V_CE = 1 V, and it supports continuous collector current up to 600 mA with derating above 25 °C ambient.

The device features a maximum V_CEO of 40 V and V_CB of 60 V, enabling use in 24 V rail interfaces and relay drivers. Its 250 MHz transition frequency allows stable operation in audio-frequency switching and low-speed digital signal buffering.

Key Specifications

Parameter	Value and Actual Design Meaning
I_C max	600 mA - supports relay coils, LED arrays, and small solenoids without external heat sinking
V_CEO	40 V - compatible with 24 V industrial control rails and automotive body electronics
f_T	250 MHz - sufficient for audio-band amplification and PWM signal conditioning up to 100 kHz
h_FE @ 10 mA	100–300 - ensures reliable saturation with standard microcontroller GPIO drive (I_B ≥ 10 µA)
R_θJA	375 K/W - requires minimum 25 mm² copper pour for sustained 300 mA operation at 50 °C ambient
V_CE(sat) @ 500 mA	0.75 V max - limits power loss to < 375 mW during switching, reducing thermal stress

Pinout & Package

Supplied in SOT-23 (TO-236AB) plastic surface-mount package with gull-wing leads, 1.3 mm pitch, and 2.9 mm × 1.3 mm footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; defines reference for base biasing
2 (Base)	Control input	Receives current-limited drive (typically 5–10 mA) to enable conduction between C and E
3 (Collector)	Current source terminal	Interfaces with load (e.g., LED anode or relay coil) tied to positive supply rail

Key Features

Feature	Design Value
High f_T (250 MHz)	Enables clean square-wave response in 100 kHz PWM dimming and audio pre-amplifier stages
Low V_CE(sat) (0.75 V max)	Reduces conduction loss in battery-powered load switches, extending runtime by >5% vs. legacy PN2222A
Wide h_FE range (100–300)	Permits robust design across production lots without recalibrating base resistor networks
SOT-23 package	Supports automated pick-and-place assembly and achieves 0.5 mm trace clearance on dense PCBs

Applications

LED Driver Circuit

Microcontroller Interface

Use Scenario: Driving 20 mA white LEDs from 3.3 V MCU GPIO pins via single-transistor switch.

IC Role / Device Role / Timing Role: NPN switch providing current gain and voltage level translation.

Use Value: Eliminates need for dedicated driver IC; enables direct GPIO control with <1 µs turn-on delay.

Use Scenario: Level-shifting 3.3 V logic signals to interface with 5 V peripherals such as UART transceivers or optocouplers.

IC Role / Device Role / Timing Role: Active-low open-collector translator with defined pull-up path.

Use Value: Provides deterministic high-Z output state and <50 ns propagation delay across temperature.

Relay Control Module

Audio Signal Amplifier

Use Scenario: Switching 12 V/100 mA electromechanical relays in HVAC control panels.

IC Role / Device Role / Timing Role: Low-side load switch with flyback diode integration capability.

Use Value: Handles inductive kickback safely when paired with discrete 1N4148 clamp; supports 10⁶ cycle relay life.

Use Scenario: Pre-amplifying microphone signals in portable voice recorders before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network.

Use Value: Delivers 20 dB voltage gain at 1 kHz with THD < 0.5% at 100 mV_pp input, minimizing component count.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching and amplification applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847BW,115	Lower I_C (100 mA), higher h_FE (200–450), same SOT-23 package	Optimized for low-current signal switching, not suitable for >200 mA loads	Select when precision biasing or ultra-low base drive is required; avoid for relay/LED array drive
MMBT4401-7-F	Same electrical specs but different marking and tape/reel packaging; R_θJA = 350 K/W	No functional difference; qualified for same industrial temperature range (−65 °C to +150 °C)	Drop-in replacement where Nexperia's S911 marking is not required; preferred for high-volume tape-fed assembly

Compared with BC847BW,115, PMBT4401/S911,215 delivers 3× higher current handling and tighter V_CE(sat) tolerance; versus MMBT4401-7-F, it offers identical performance with distinct traceability and reel labeling per OEM requirements.

Availability

PMBT4401/S911,215 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface modules, relay control systems, and audio signal amplifiers requiring stable component supply across production lifecycles.

Supply support for PMBT4401/S911,215 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

Nexperia is a global semiconductor expert focused on essential efficiency, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The PMBT4401/S911,215 belongs to Nexperia's General Purpose Transistors product line, engineered for cost-sensitive, high-volume applications demanding consistent gain, fast switching, and robust thermal behavior in compact SMT packages.

FAQ

What is the maximum continuous collector current for PMBT4401/S911,215?

The PMBT4401/S911,215 supports a maximum continuous collector current (I_C) of 600 mA at T_amb = 25 °C. Derating is required above this temperature: current must be reduced linearly to 0 mA at 150 °C junction temperature, following the specified R_θJA of 375 K/W and thermal layout guidelines in the official Nexperia datasheet.

Can PMBT4401/S911,215 replace PN2222A in existing designs?

Yes, PMBT4401/S911,215 is a direct SOT-23 drop-in replacement for through-hole PN2222A in most low-to-medium power switching applications. It matches or exceeds V_CEO, f_T, and h_FE specifications while offering lower V_CE(sat) and superior thermal performance in surface-mount layouts.

Does PMBT4401/S911,215 require a base resistor in switching applications?

Yes - a series base resistor is mandatory to limit I_B and ensure proper saturation. For 500 mA collector current and h_FE ≥ 100, a 1 kΩ resistor from a 3.3 V GPIO yields ~3.3 mA I_B, achieving forced β ≈ 150 and reliable saturation with V_CE(sat) ≤ 0.75 V.

Is PMBT4401/S911,215 suitable for automotive applications?

PMBT4401/S911,215 is qualified to AEC-Q101 standards and rated for operation from −65 °C to +150 °C, making it suitable for under-hood and cabin electronics. Its robust SOA curve and tight parameter distribution support reliability-critical functions like LED lighting control and sensor interface buffering in automotive ECUs.

PMBT4401/S911,215 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 600 mA

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

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 1V

Power - Max:: 250 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

PMBT4401/S911,215 FAQ

1.How can I place an order for PMBT4401/S911,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBT4401/S911,215 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 PMBT4401/S911,215 reliable?

The price and inventory of PMBT4401/S911,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBT4401/S911,215 is usually 5 days.

3.What payment methods are accepted for PMBT4401/S911,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBT4401/S911,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBT4401/S911,215?

PMBT4401/S911,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBT4401/S911,215 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 PMBT4401/S911,215?

For technical support, including PMBT4401/S911,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBT4401/S911,215 requirements.

6.How does Aetrix verify that PMBT4401/S911,215 is sourced from the original manufacturer or authorized distributors?

All PMBT4401/S911,215 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 PMBT4401/S911,215 meets industry standards.

7.What is the process for return or replacement of PMBT4401/S911,215?

All PMBT4401/S911,215 units undergo pre-shipment inspection (PSI). If there is an issue with PMBT4401/S911,215, 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 PMBT4401/S911,215 part is unused and in its original packaging.

Return procedure for PMBT4401/S911,215:

1.Submit a request within 90 days.

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

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