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

Nexperia USA Inc. PMBS3904,235

Name: PMBS3904,235
Brand: Nexperia USA Inc.
SKU: PMBS3904,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBS3904,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PMBS3904,235.pdf

Description:: TRANS NPN 40V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PMBS3904,235 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT23 package, rated for 40 V V_CEO, 100 mA I_C, and 250 mW P_tot, with DC current gain h_FE = 100–300 at I_C = 10 mA, used in low-voltage telephony signal switching and amplifier stages.

For engineers reviewing the PMBS3904,235 datasheet, PMBS3904,235 pinout, PMBS3904,235 application, or PMBS3904,235 equivalent, this page delivers verified electrical parameters, thermal resistance (500 K/W), switching times (t_on = 110 ns, t_off = 1200 ns), and complementary PNP pairing with PMBS3906.

Technical Context

This discrete NPN transistor operates in linear and saturated switching modes with V_CE(sat) ≤ 200 mV at I_C = 10 mA / I_B = 1 mA and f_T = 180 MHz, supporting audio-frequency amplification and digital logic interfacing up to ~10 MHz.

Its low C_c = 4 pF and C_e = 12 pF enable stable high-frequency biasing; noise figure of 5 dB at 100 µA makes it suitable for low-level analog preamplifier front-ends in communication receivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C	100 mA - continuous DC collector current handling capacity at T_amb ≤ 25 °C
h_FE	100–300 - DC current gain range at I_C = 10 mA, enabling predictable base drive sizing
V_CE(sat)	≤200 mV - low saturation voltage ensures minimal power loss in switching applications
R_th(j-a)	500 K/W - thermal resistance from junction to ambient on FR4 PCB, defining derating above 25 °C
f_T	180 MHz - transition frequency confirming usable bandwidth for RF frontend or fast-switching logic
t_off	1200 ns - total turn-off time (storage + fall), critical for PWM duty cycle fidelity below 100 kHz

Pinout & Package

Package: SOT23 (TO-236AB), plastic surface-mounted, 3-lead, footprint compatible with JEDEC MO-215AA standard; dimensions: 2.9 × 1.3 × 1.0 mm (L × W × H).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires ~1 mA drive for 10 mA collector switching; sensitive to ESD
2	Emitter	Current return path; connected to ground or low-impedance node in common-emitter topology
3	Collector	Output current sink; routed to load or pull-up resistor; handles full I_C and V_CEO stress

Key Features

Feature	Design Value
Low saturation voltage	V_CE(sat) ≤ 200 mV @ I_C/I_B = 10 mA/1 mA - reduces conduction loss in battery-powered switches
High DC current gain	h_FE ≥ 100 @ I_C = 10 mA - enables microcontroller GPIO direct drive without external buffer stage
Fast switching performance	t_on = 110 ns, t_off = 1200 ns - supports pulse-width modulation up to 100 kHz with clean edges
Low capacitance	C_c = 4 pF, C_e = 12 pF - minimizes Miller effect and improves stability in high-gain amplifier configurations

Applications

Telephony Line Interface

USB Port Protection Circuit

Use Scenario: Signal level shifting and ring detection in analog telephone line interface cards.

IC Role / Device Role / Timing Role: NPN switch controlling optocoupler LED drive and AC ring-signal rectification path.

Use Value: Low V_CE(sat) preserves headroom across 48 V nominal line; h_FE consistency ensures reliable detection across temperature.

Use Scenario: Overcurrent foldback and hot-swap control in USB 2.0 downstream ports.

IC Role / Device Role / Timing Role: Current-sense amplifier input stage and enable switch for load disconnect MOSFET gate driver.

Use Value: 180 MHz f_T supports fast response to short-circuit events; 500 K/W R_th(j-a) allows operation at 70 °C ambient without heatsink.

Audio Pre-amplifier Stage

Microcontroller GPIO Expander

Use Scenario: First-stage low-noise amplification in portable voice recorder front-end.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with emitter degeneration resistor.

Use Value: 5 dB noise figure at 100 µA bias enables SNR > 65 dB in 20 Hz–20 kHz band; low C_e prevents high-frequency roll-off.

Use Scenario: Driving higher-current peripherals (LEDs, relays) from 3.3 V MCU outputs.

IC Role / Device Role / Timing Role: Digital switch translating logic-high to 5 V/100 mA load current.

Use Value: Guaranteed h_FE ≥ 70 at I_C = 1 mA ensures full saturation with 3.3 V GPIO; SOT23 footprint saves board space vs. SO-8 alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847B,215	Same SOT23 package; h_FE = 200–450 at I_C = 10 mA; V_CEO = 45 V; P_tot = 300 mW	Higher gain and voltage rating; slightly higher power dissipation capability	Select when tighter h_FE tolerance or 5 V margin above 40 V rail is required
MMBT3904LT1G	SOT23 package; V_CEO = 40 V; I_C = 200 mA; P_tot = 310 mW; h_FE = 100–300 at I_C = 10 mA	Higher current rating and thermal margin; same gain profile and pinout	Select for designs requiring >100 mA peak load current or extended ambient temperature operation

Compared with BC847B,215 and MMBT3904LT1G, PMBS3904,235 offers optimal balance of gain consistency, low-cost manufacturability, and proven reliability in legacy telephony BOMs-ideal where qualification stability outweighs marginal parameter upgrades.

Availability

PMBS3904,235 is available at Aetrix Electronics and suitable for telephony infrastructure, USB peripheral protection, audio pre-amplifier design, and microcontroller I/O expansion requiring stable component supply and long-term industrial lifecycle support.

Supply support for PMBS3904,235 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 discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

PMBS3904,235 belongs to Nexperia's General Purpose Transistor product line, engineered for cost-sensitive, high-reliability signal switching and amplification in mass-produced communication and embedded systems.

FAQ

Is PMBS3904,235 RoHS compliant and halogen-free?

Yes. PMBS3904,235 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 compliance effective Q1 2017, with material declarations available via their Quality Portal.

What is the maximum operating junction temperature for continuous use?

The absolute maximum junction temperature T_j is 150 °C. For continuous operation, derating begins at T_amb > 25 °C using R_th(j-a) = 500 K/W: P_tot must be reduced by 0.5 mW/°C above 25 °C ambient to maintain T_j ≤ 150 °C.

Does PMBS3904,235 have a qualified AEC-Q101 rating for automotive use?

No. PMBS3904,235 is not AEC-Q101 qualified. It is specified for industrial and commercial applications only. For automotive-grade equivalents, consider Nexperia's PUMD3 or PBSS4041 series, which undergo full stress testing per AEC-Q101 Rev D.

Can PMBS3904,235 replace BC547 in existing designs?

Yes, with verification. Both are NPN transistors, but PMBS3904,235 has lower I_C (100 mA vs. 100 mA typical for BC547), identical V_CEO (45 V for BC547, 40 V for PMBS3904,235), and SOT23 vs. TO-92 package-mechanical redesign is required; electrical behavior is functionally similar under 10 mA bias.

PMBS3904,235 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

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

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 10mA, 1V

Power - Max:: 250 mW

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMBS3904,235 FAQ

1.How can I place an order for PMBS3904,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBS3904,235 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 PMBS3904,235 reliable?

The price and inventory of PMBS3904,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBS3904,235 is usually 5 days.

3.What payment methods are accepted for PMBS3904,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBS3904,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBS3904,235?

PMBS3904,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBS3904,235 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 PMBS3904,235?

For technical support, including PMBS3904,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBS3904,235 requirements.

6.How does Aetrix verify that PMBS3904,235 is sourced from the original manufacturer or authorized distributors?

All PMBS3904,235 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 PMBS3904,235 meets industry standards.

7.What is the process for return or replacement of PMBS3904,235?

All PMBS3904,235 units undergo pre-shipment inspection (PSI). If there is an issue with PMBS3904,235, 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 PMBS3904,235 part is unused and in its original packaging.

Return procedure for PMBS3904,235:

1.Submit a request within 90 days.

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

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