Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. PMST4401,115

Name: PMST4401,115
Brand: Nexperia USA Inc.
SKU: PMST4401,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PMST4401,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: PMST4401,115.pdf

Description:: TRANS NPN 40V 0.6A SOT-323

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,100

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

PMST4401 from Nexperia is an NPN bipolar junction transistor (BJT) designed for low-voltage, medium-current switching in space-constrained portable electronics. It delivers 600 mA collector current, 40 V collector-emitter breakdown voltage, and DC current gain (h_FE) of 80 at 10 mA/1 V, housed in a compact SOT323 (SC-70) package measuring 2.0 × 1.25 × 0.95 mm.

For engineers reviewing the PMST4401 datasheet, PMST4401 pinout, PMST4401 application, or PMST4401 equivalent, this device supports high-speed digital switching (t_on = 35 ns, t_off = 250 ns), low saturation voltage (V_CEsat = 750 mV @ 500 mA/50 mA), and thermal operation from −65 °C to +150 °C - critical for battery-powered load control and signal routing.

Technical Context

The PMST4401 operates as a discrete NPN switch with fixed emitter-grounded configuration and base-controlled conduction. Its design emphasizes fast turn-on/turn-off (t_d = 15 ns, t_f = 60 ns) and stable h_FE across temperature (80–300 at I_C = 10–150 mA, T_amb = −55 to +150 °C).

It features low parasitic capacitance (C_c = 8 pF, C_e = 30 pF), f_T = 250 MHz, and absolute maximum ratings including V_CBO = 60 V, V_EBO = 6 V, and P_tot = 200 mW on FR4 PCB - confirming suitability for 3.3 V/5 V logic-driven switching rather than linear amplification.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit for 3.3 V/5 V systems.
I_C	600 mA - Continuous collector current capacity; supports driving small relays, LEDs, or MOSFET gates.
h_FE	80 (min) @ 10 mA/1 V - Ensures reliable saturation with modest base drive (e.g., 125 µA base current for 10 mA collector load).
V_CEsat	750 mV (max) @ 500 mA/50 mA - Minimizes power loss (≤375 mW) and self-heating during active switching.
t_off	250 ns - Enables PWM operation up to ~400 kHz with clean edge definition and minimal overlap loss.
R_th(j-a)	625 K/W - Thermal resistance confirms need for layout-aware copper pour or derating above 100 mA in ambient >50 °C.

Pinout & Package

Package: SOT323 (SC-70), plastic surface-mount, 3-lead, 1.3 mm pitch, body size 2.0 × 1.25 × 0.95 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input requiring current-limited drive (I_B ≤ 200 mA peak); connects to MCU GPIO or logic buffer.
2	Emitter (E)	Common reference node; tied to ground in low-side switch configuration; defines current return path.
3	Collector (C)	Switched output node; connects to load (e.g., LED anode or relay coil); handles full 600 mA switched current.

Key Features

Feature	Design Value
High-speed switching	t_on = 35 ns, t_off = 250 ns - enables efficient PWM dimming and digital signal routing without shoot-through risk.
Low V_CEsat	750 mV max @ 500 mA - reduces conduction loss by >40% vs. standard general-purpose transistors (e.g., BC817).
Thermal robustness	T_j = 150 °C max, T_stg = −65 to +150 °C - supports operation in sealed enclosures or automotive cabin-adjacent modules.
Small-footprint packaging	SOT323 footprint occupies <1.5 mm² PCB area - ideal for wearables, hearing aids, and multi-channel sensor nodes.

Applications

Portable Power Switching

LED Driver Control

Use Scenario: Enabling/disabling 3.3 V subsystems (e.g., Bluetooth module, sensor array) in battery-powered IoT endpoints.

IC Role / Device Role / Timing Role: Low-side switch controlled by microcontroller GPIO; toggles within 250 ns to minimize idle current leakage.

Use Value: 750 mV V_CEsat limits voltage drop across switch, preserving >95% of supply rail for downstream circuitry.

Use Scenario: Driving single-color or RGB indicator LEDs in handheld medical devices with strict EMI and size constraints.

IC Role / Device Role / Timing Role: Constant-current switch operating in PWM mode at 1–10 kHz; base driven by timer output.

Use Value: 250 MHz f_T and 60 ns fall time ensure crisp LED on/off transitions without visible flicker or ghosting.

Logic-Level Signal Translation

Load Protection Interface

Use Scenario: Level-shifting 1.8 V FPGA I/O signals to control 5 V peripherals in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Digital inverter stage with h_FE ≥ 80 ensuring full saturation at 10 µA base drive.

Use Value: 80–300 h_FE range across temperature guarantees consistent logic threshold margin from −40 °C to +85 °C.

Use Scenario: Isolating microcontroller pins from inductive loads (e.g., solenoid valves) in industrial handheld testers.

IC Role / Device Role / Timing Role: Flyback diode–assisted switch handling 600 mA transient surges; base clamped via resistor network.

Use Value: 60 V V_CBO rating provides 50% headroom over 40 V inductive kickback, preventing avalanche failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40,115	Higher h_FE (250 min), larger SOT23 package (2.9 × 1.3 × 1.0 mm), higher P_tot (310 mW)	Better for linear amplification or higher-current analog stages; less suitable for ultra-dense layouts	Select when higher DC gain or thermal margin is prioritized over board space.
MMBT4401LT1G	Same electrical specs but in SOT-23 package; RoHS-compliant, no lead-free exemption	Compatible with legacy SOT-23 footprints; lacks SC-70's 30% area reduction	Choose for backward compatibility with existing SOT-23 designs or where reflow profile tolerance is critical.

Compared with BC817-40 and MMBT4401LT1G, the PMST4401 trades slightly lower h_FE and power dissipation for 35% smaller PCB footprint and optimized high-speed switching performance - making it the preferred choice for miniaturized, battery-operated digital switches.

Availability

PMST4401 is available at Aetrix Electronics and suitable for portable power switching, LED driver control, logic-level signal translation, and load protection interface applications requiring stable component supply and long-term manufacturability.

Supply support for PMST4401 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets.

The PMST4401 belongs to Nexperia's general-purpose bipolar transistor product line, engineered specifically for space-constrained, low-voltage digital switching in consumer and portable electronics.

FAQ

Is the PMST4401 suitable for automotive applications?

No. The PMST4401 is explicitly designated as non-automotive qualified per its 2025 revision history. It lacks AEC-Q101 qualification, automotive-grade screening, and extended temperature validation beyond 150 °C junction. For automotive use, Nexperia offers the PMST4401-Q variant with full AEC-Q101 compliance and enhanced reliability testing.

What is the recommended base resistor value for driving a 100 mA load?

With h_FE ≥ 80 at I_C = 100 mA, a minimum base current of 1.25 mA is required. Using a 3.3 V GPIO with V_BEsat ≈ 1.2 V, a 1.6 kΩ resistor yields 1.3 mA base drive - ensuring solid saturation while allowing margin for h_FE degradation at elevated temperature.

Does the PMST4401 require a flyback diode when switching inductive loads?

Yes. Although V_CBO = 60 V provides headroom, the device lacks integrated clamp protection. When switching relays or solenoids, a discrete 1N4148 or BAT54 Schottky diode must be placed anode-to-emitter, cathode-to-collector to suppress inductive voltage spikes and prevent junction breakdown.

Can the PMST4401 replace the PN2222A in existing designs?

Only with layout and drive adjustments. While both are NPN switches, the PMST4401 uses SOT323 (vs. TO-92 or SOT-23 for PN2222A), has lower V_CEO (40 V vs. 40 V same), but significantly lower P_tot (200 mW vs. 625 mW). Direct replacement requires verifying thermal margin and adapting footprint and base drive strength.

PMST4401,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

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:: 200 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

PMST4401,115 FAQ

1.How can I place an order for PMST4401,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMST4401,115 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 PMST4401,115 reliable?

The price and inventory of PMST4401,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMST4401,115 is usually 5 days.

3.What payment methods are accepted for PMST4401,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMST4401,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMST4401,115?

PMST4401,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMST4401,115 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 PMST4401,115?

For technical support, including PMST4401,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMST4401,115 requirements.

6.How does Aetrix verify that PMST4401,115 is sourced from the original manufacturer or authorized distributors?

All PMST4401,115 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 PMST4401,115 meets industry standards.

7.What is the process for return or replacement of PMST4401,115?

All PMST4401,115 units undergo pre-shipment inspection (PSI). If there is an issue with PMST4401,115, 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 PMST4401,115 part is unused and in its original packaging.

Return procedure for PMST4401,115:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…