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

onsemi FMBS5401

Name: FMBS5401
Brand: onsemi
SKU: FMBS5401
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FMBS5401

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SOT-23-6 Thin, TSOT-23-6

Datasheet:: FMBS5401.pdf

Description:: TRANS PNP 150V 0.6A SUPERSOT-6

Quantity:: RFQ Add To RFQ list

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Product details

Overview

FMBS5401 from Fairchild Semiconductor is a PNP epitaxial silicon transistor in SuperSOT™-6 package, rated for -150 V V_CEO, -600 mA continuous I_C, and 700 mW power dissipation. It serves as a high-voltage general-purpose amplifier and switch in industrial power control and relay driver circuits.

For engineers reviewing the FMBS5401 datasheet, pinout, applications, or equivalent options, key selection criteria include its -150 V breakdown rating, low V_CE(sat) of -0.2 V at -10 mA/-1 mA drive, h_FE range of 50–240, thermal resistance of 180 °C/W, and SuperSOT™-6 footprint compatibility with space-constrained PCB layouts.

Technical Context

The FMBS5401 operates as a single PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its design supports high-voltage blocking (V_CBO = -160 V) and stable DC current gain across collector currents from -1 mA to -50 mA, with specified h_FE minima of 50 at both low and mid-current conditions.

Thermal performance is defined for mounting on a 1 in² pad of 2 oz copper, delivering R_θJA = 180 °C/W. Small-signal behavior includes f_T = 100–300 MHz and Cob = 6.0 pF at -10 V, enabling use in moderate-frequency amplification and fast-switching applications up to ~100 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-150 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (continuous)	-600 mA - Continuous collector current handling capacity under steady-state thermal conditions
P_D	700 mW - Total device power dissipation limit on standard 1 in² 2 oz copper pad
h_FE	50–240 - DC current gain range across operating points (-1 mA to -50 mA), supporting reliable biasing
V_CE(sat)	-0.2 V @ -10 mA/-1 mA - Low saturation voltage enables efficient switching with minimal conduction loss
f_T	100–300 MHz - Current gain bandwidth product confirming suitability for RF amplification up to VHF band
R_θJA	180 °C/W - Junction-to-ambient thermal resistance defining required board-level copper area for thermal management

Pinout & Package

FMBS5401 is housed in the SuperSOT™-6 surface-mount package (dimensions per datasheet Rev. A), featuring six terminals in a compact, thermally enhanced outline. Pin #1 is marked with ".4S1".

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current source terminal for PNP operation	Connected to higher potential rail; primary current exit path in active/saturation modes
C1 (Collector 1)	Main collector terminal	Primary high-voltage load connection point; rated for -150 V V_CEO and -600 mA I_C
NC	No-connect terminal	Internally unconnected; must remain floating per datasheet to avoid parasitic coupling or reliability risk
C (Collector)	Secondary collector terminal	Electrically tied to C1 internally; provides redundant solder joint and improved thermal conduction in layout
B (Base)	Control input for minority-carrier injection	Receives negative base current to turn on PNP; requires external current-limiting resistor in most designs
C (Collector)	Third collector terminal	Same internal node as C1 and first C; enhances thermal dissipation and mechanical robustness in high-reliability layouts

Key Features

Feature	Design Value
High-voltage PNP structure	Supports -160 V V_CBO and -150 V V_CEO, enabling use in 100–120 V AC line-sensing and industrial bus interfaces
Low V_CE(sat)	-0.2 V at -10 mA/-1 mA ensures <200 mW conduction loss in switching applications at moderate loads
SuperSOT™-6 thermal design	180 °C/W R_θJA with standard layout allows 700 mW dissipation without heatsink in ambient ≤50 °C
Wide h_FE range	50–240 across -1 mA to -50 mA enables stable biasing in both small-signal amplification and hard-switching configurations
Low noise figure	8.0 dB NF (10 Hz–15.7 kHz) supports audio preamplifier and sensor signal conditioning roles

Applications

Industrial Relay Driver	High-Voltage Level Shifter
Use Scenario: Driving electromagnetic relays in programmable logic controller (PLC) output modules operating from 24–48 V DC rails with inductive kickback up to -150 V. IC Role / Device Role / Timing Role: PNP switch providing high-side current sink capability with fast turn-off and robust voltage clamping. Use Value: -150 V V_CEO withstands relay coil flyback transients; -0.2 V V_CE(sat) minimizes power loss during sustained ON state.	Use Scenario: Translating logic-level signals from 3.3 V/5 V microcontrollers to interface with -48 V telecom backplane buses. IC Role / Device Role / Timing Role: Inverting level shifter with open-collector output referenced to negative supply rail. Use Value: -160 V V_CBO ensures safe operation with large common-mode swings; h_FE ≥50 guarantees reliable drive into high-impedance loads.
Linear Audio Preamp Stage	AC Line Voltage Monitor
Use Scenario: Low-noise preamplifier stage in battery-powered portable audio recorders requiring wide dynamic range and low THD. IC Role / Device Role / Timing Role: Single-ended Class-A amplifier configured with emitter degeneration for linearity. Use Value: 8.0 dB noise figure enables clean signal amplification; f_T > 100 MHz supports full audio bandwidth with margin.	Use Scenario: Resistive divider-based zero-crossing detection and RMS monitoring in smart energy meters connected to 120/230 V AC mains. IC Role / Device Role / Timing Role: High-voltage interface transistor isolating metering IC from line-referenced sensing nodes. Use Value: -150 V V_CEO accommodates peak AC line voltages; -50 nA I_CBO at 25 °C ensures negligible leakage error in precision divider networks.

Industrial Relay Driver

High-Voltage Level Shifter

Use Scenario: Driving electromagnetic relays in programmable logic controller (PLC) output modules operating from 24–48 V DC rails with inductive kickback up to -150 V.

IC Role / Device Role / Timing Role: PNP switch providing high-side current sink capability with fast turn-off and robust voltage clamping.

Use Value: -150 V V_CEO withstands relay coil flyback transients; -0.2 V V_CE(sat) minimizes power loss during sustained ON state.

Use Scenario: Translating logic-level signals from 3.3 V/5 V microcontrollers to interface with -48 V telecom backplane buses.

IC Role / Device Role / Timing Role: Inverting level shifter with open-collector output referenced to negative supply rail.

Use Value: -160 V V_CBO ensures safe operation with large common-mode swings; h_FE ≥50 guarantees reliable drive into high-impedance loads.

Linear Audio Preamp Stage

AC Line Voltage Monitor

Use Scenario: Low-noise preamplifier stage in battery-powered portable audio recorders requiring wide dynamic range and low THD.

IC Role / Device Role / Timing Role: Single-ended Class-A amplifier configured with emitter degeneration for linearity.

Use Value: 8.0 dB noise figure enables clean signal amplification; f_T > 100 MHz supports full audio bandwidth with margin.

Use Scenario: Resistive divider-based zero-crossing detection and RMS monitoring in smart energy meters connected to 120/230 V AC mains.

IC Role / Device Role / Timing Role: High-voltage interface transistor isolating metering IC from line-referenced sensing nodes.

Use Value: -150 V V_CEO accommodates peak AC line voltages; -50 nA I_CBO at 25 °C ensures negligible leakage error in precision divider networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage amplifier and switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT5401	Same die in SOT-23 package; lower P_D (350 mW), higher R_θJA (300 °C/W), identical electrical specs	Limited to lower-power switching and amplification due to thermal constraints	Select when board space is critical and power dissipation ≤350 mW suffices
PN2907A	SOT-23 package; V_CEO = -60 V, I_C = -600 mA, h_FE = 100–300, P_D = 350 mW	Not suitable for >-60 V applications; better h_FE uniformity but lower voltage rating	Select only for sub-60 V systems where gain consistency outweighs voltage headroom needs

Compared with MMBT5401 and PN2907A, the FMBS5401 delivers superior thermal performance (700 mW vs. 350 mW) and full -150 V capability in the same functional category-enabling higher-reliability operation in industrial and mains-connected designs without derating.

Availability

FMBS5401 is available at Aetrix Electronics and suitable for industrial relay drivers, high-voltage level shifters, linear audio preamplifiers, and AC line voltage monitors requiring stable component supply and long-term manufacturing continuity.

Supply support for FMBS5401 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The FMBS5401 belongs to Fairchild's SuperSOT™-6 PNP transistor family, engineered for high-voltage industrial control, power supply sequencing, and signal conditioning where thermal efficiency and voltage robustness are critical.

FAQ

What is the maximum collector-emitter voltage rating for FMBS5401?

The FMBS5401 has a maximum collector-emitter voltage (V_CEO) rating of -150 V at T_A = 25 °C. This rating is validated under pulsed test conditions and reflects the device's ability to block reverse voltage in common-emitter configuration without breakdown. Operation beyond this value risks permanent damage, especially at elevated temperatures.

Does FMBS5401 support linear amplification applications?

Yes, the FMBS5401 supports linear amplification, evidenced by its specified noise figure of 8.0 dB (10 Hz–15.7 kHz), f_T of 100–300 MHz, and stable h_FE across collector currents from -1 mA to -50 mA. These parameters confirm suitability for audio preamplifier stages and sensor signal conditioning where low distortion and wide bandwidth are required.

What is the thermal resistance of FMBS5401, and how does it affect PCB layout?

The FMBS5401 has a junction-to-ambient thermal resistance (R_θJA) of 180 °C/W when mounted on a 1 in² pad of 2 oz copper. This means that at 700 mW dissipation, junction temperature rise will be approximately 126 °C above ambient. To maintain TJ ≤ 150 °C, ambient must stay below 24 °C unless additional copper or airflow is applied-guiding layout decisions for thermal relief and copper pour sizing.

How many collector terminals does FMBS5401 have, and why?

The FMBS5401 features three collector terminals (C, C, and C1) plus one NC and one E and one B-totaling six pins in SuperSOT™-6. Two collector pins are electrically tied to the same internal node as C1 to improve thermal conduction and mechanical reliability. This multi-terminal collector design enhances heat spreading and solder joint integrity in high-reliability industrial applications.

Is FMBS5401 pin-compatible with MMBT5401?

No, FMBS5401 is not pin-compatible with MMBT5401. While both share the same die, FMBS5401 uses the 6-pin SuperSOT™-6 package with three collector terminals and an NC pin, whereas MMBT5401 uses the 3-pin SOT-23 package. Layout redesign and footprint change are required when substituting between them-even though electrical characteristics are otherwise identical.

FMBS5401 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOT-23-6 Thin, TSOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 150 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 60 @ 10mA, 5V

Power - Max:: 700 mW

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SuperSOT™-6

FMBS5401 FAQ

1.How can I place an order for FMBS5401 through Aetrix?

Please submit a Request for Quotation (RFQ) for FMBS5401 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 FMBS5401 reliable?

The price and inventory of FMBS5401 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMBS5401 is usually 5 days.

3.What payment methods are accepted for FMBS5401?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMBS5401 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMBS5401?

FMBS5401 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMBS5401 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 FMBS5401?

For technical support, including FMBS5401 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMBS5401 requirements.

6.How does Aetrix verify that FMBS5401 is sourced from the original manufacturer or authorized distributors?

All FMBS5401 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 FMBS5401 meets industry standards.

7.What is the process for return or replacement of FMBS5401?

All FMBS5401 units undergo pre-shipment inspection (PSI). If there is an issue with FMBS5401, 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 FMBS5401 part is unused and in its original packaging.

Return procedure for FMBS5401:

1.Submit a request within 90 days.

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

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