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

Nexperia USA Inc. PMST2222A,115

Name: PMST2222A,115
Brand: Nexperia USA Inc.
SKU: PMST2222A,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMST2222A,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: PMST2222A,115.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:21,176

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Product details

Overview

PMST2222A,115 from Nexperia is an NPN bipolar junction transistor (BJT) designed for high-speed switching and linear amplification in compact SOT323 packages. It delivers 600 mA DC collector current, 40 V V_CEO, and 300 MHz transition frequency (f_T), with V_CE(sat) as low as 300 mV at IC = 150 mA/IB = 15 mA. It is used in portable power management, LED drivers, and signal conditioning circuits where space-constrained discrete gain and switching are required.

For engineers reviewing the PMST2222A,115 datasheet, PMST2222A,115 pinout, PMST2222A,115 application, or PMST2222A,115 equivalent, key selection criteria include verified V_CEO/V_CBO ratings, h_FE consistency across 0.1–500 mA, saturation voltage under pulsed drive, thermal resistance (R_{th j-a} = 625 K/W), and SOT323 footprint compatibility with automated assembly.

Technical Context

This NPN BJT operates in active, saturation, and cutoff regions with defined DC current gain (h_FE) ranging from 35 to 300 depending on I_C and V_CE. Its f_T of 300 MHz supports RF and fast digital switching up to ~100 MHz edge rates.

Thermal performance is specified for FR4 PCB mounting (R_{th j-a} = 625 K/W); absolute maximum ratings include T_j = 150 °C and T_stg = −65 to +150 °C, enabling use in industrial ambient environments without derating below 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in switch-mode operation.
I_C (DC)	600 mA - Continuous collector current capability; sets load-driving capacity in relay drivers or LED arrays.
f_T	300 MHz - Transition frequency at I_C = 20 mA/V_CE = 20 V; indicates usable bandwidth for small-signal amplification.
V_CE(sat)	300 mV @ I_C = 150 mA/I_B = 15 mA - Low saturation voltage minimizes conduction loss in switching applications.
h_FE	100–300 @ I_C = 150–500 mA - High, stable DC current gain enables reliable base-current-limited switching control.
R_{th j-a}	625 K/W - Junction-to-ambient thermal resistance on FR4; determines temperature rise under 200 mW dissipation.
C_e	25 pF @ V_EB = 0.5 V - Emitter junction capacitance affects high-frequency input impedance and Miller effect.

Pinout & Package

SOT323 plastic surface-mount package (3-lead, JEDEC SC-70), dimensions: 2.2 × 1.35 × 0.95 mm (L × W × H), with gull-wing leads and exposed pad not present. Compatible with standard reflow profiles and pick-and-place equipment.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires series resistor to limit I_B and ensure saturation at target I_C.
2	Emitter	Reference terminal for biasing; connected to ground or low-side return path in common-emitter configuration.
3	Collector	Output current sink; connects to load and positive supply in low-side switch topology.

Key Features

Feature	Design Value
High-speed switching	Turn-off time (t_off) = 250 ns and storage time (t_s) = 200 ns enable >1 MHz digital switching in logic interface circuits.
Low V_CE(sat)	300 mV at I_C/I_B = 10 ensures minimal power loss and heat generation in battery-powered loads.
Wide h_FE range	100–300 across 150–500 mA supports consistent gain-driven design without binning or feedback compensation.
Robust thermal rating	T_j = 150 °C and T_stg = −65 to +150 °C allow deployment in automotive under-hood and industrial control enclosures.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20–50 mA indicator LEDs from 3.3 V or 5 V microcontroller outputs.

IC Role / Device Role / Timing Role: Low-side NPN switch controlled by MCU GPIO; provides current gain to overcome GPIO current limits.

Use Value: Enables direct LED control without external driver ICs; V_CE(sat) ≤ 400 mV keeps LED forward voltage drop predictable and power loss < 20 mW.

Use Scenario: Amplifying weak sensor signals (e.g., thermistor divider output) before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias; provides voltage gain and impedance transformation.

Use Value: h_FE ≥ 100 at I_C = 1 mA ensures stable small-signal gain; f_T > 250 MHz avoids bandwidth limitation in sub-100 kHz analog paths.

Power Supply Enable Switch

Level-Shifting Interface

Use Scenario: Enabling/disabling a 12 V auxiliary rail using a 3.3 V logic signal in embedded power systems.

IC Role / Device Role / Timing Role: High-side or low-side pass switch; configured with base resistor and optional pull-down.

Use Value: V_CEO = 40 V exceeds 12 V rail with margin; I_C = 600 mA supports typical enable currents up to 500 mA.

Use Scenario: Translating 1.8 V logic signals to 5 V levels for legacy peripherals in mixed-voltage systems.

IC Role / Device Role / Timing Role: Active pull-up switch in open-collector configuration with external pull-up resistor.

Use Value: Fast t_r/t_f ≤ 20/60 ns preserves signal integrity at 1–5 MHz data rates; C_c = 8 pF minimizes capacitive loading on source.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847BW,115	V_CEO = 45 V, h_FE = 200–450, R_{th j-a} = 500 K/W, SOT323 package	Higher h_FE and lower thermal resistance; slightly higher V_CEO	Preferred when tighter h_FE tolerance or improved thermal performance is needed at same footprint.
MMBT2222ALT1G	V_CEO = 40 V, I_C = 600 mA, f_T = 300 MHz, SOT23 package (larger than SOT323)	Different package (SOT23 vs SOT323); identical electrical specs but 30% larger board area	Select only if SOT23 is already standardized in design; not drop-in due to footprint mismatch.

Compared with BC847BW,115, PMST2222A,115 offers lower cost and adequate h_FE for most switching uses; versus MMBT2222ALT1G, it saves PCB area but requires requalification for SOT323 assembly processes.

Availability

PMST2222A,115 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, power supply enable switches, and level-shifting interfaces requiring stable component supply and SOT323 footprint compatibility.

Supply support for PMST2222A,115 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 leader in high-volume production of discrete semiconductors, with expertise in automotive-grade reliability, industrial robustness, and consumer electronics scalability.

The PMST2222A,115 belongs to Nexperia's general-purpose NPN transistor product line, engineered for cost-sensitive, space-constrained applications demanding proven switching speed, gain stability, and thermal resilience.

FAQ

Is PMST2222A,115 RoHS compliant and halogen-free?

Yes. PMST2222A,115 meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. Nexperia's official product change notice (PCN) 17001 confirms full compliance for all SOT323-packaged transistors manufactured after February 2017, including this part number.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current (I_BM) is 200 mA, but continuous DC base current must be limited to ensure I_C ≤ 600 mA and P_tot ≤ 200 mW. At V_CE(sat) ≈ 300 mV and h_FE = 100, sustained I_B should not exceed 6 mA to avoid thermal runaway on FR4 boards.

Can PMST2222A,115 replace PMST2222,115 in existing designs?

Yes, with improved specifications: PMST2222A,115 has higher V_CBO (75 V vs 60 V), higher V_CEO (40 V vs 30 V), lower V_CE(sat) (300 mV vs 400 mV), and higher f_T (300 MHz vs 250 MHz). Pinout, package, and marking are identical; no layout or firmware changes are required.

Does this transistor support pulsed operation beyond its DC ratings?

Yes. Per datasheet note 1, pulse testing (t_p ≤ 300 µs, duty cycle δ ≤ 0.02) allows I_C up to 800 mA and I_B up to 200 mA. This enables short-duration surge handling in motor commutation or solenoid driving, provided average power remains within 200 mW.

PMST2222A,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:: 1V @ 50mA, 500mA

Current - Collector Cutoff (Max):: 10nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 200 mW

Frequency - Transition:: 300MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

PMST2222A,115 FAQ

1.How can I place an order for PMST2222A,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMST2222A,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 PMST2222A,115 reliable?

The price and inventory of PMST2222A,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMST2222A,115 is usually 5 days.

3.What payment methods are accepted for PMST2222A,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMST2222A,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMST2222A,115?

PMST2222A,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMST2222A,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 PMST2222A,115?

For technical support, including PMST2222A,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMST2222A,115 requirements.

6.How does Aetrix verify that PMST2222A,115 is sourced from the original manufacturer or authorized distributors?

All PMST2222A,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 PMST2222A,115 meets industry standards.

7.What is the process for return or replacement of PMST2222A,115?

All PMST2222A,115 units undergo pre-shipment inspection (PSI). If there is an issue with PMST2222A,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 PMST2222A,115 part is unused and in its original packaging.

Return procedure for PMST2222A,115:

1.Submit a request within 90 days.

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

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