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

NXP Semiconductors PBSS4140S,126

Name: PBSS4140S,126
Brand: NXP Semiconductors
SKU: PBSS4140S,126
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PBSS4140S,126

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: PBSS4140S,126.pdf

Description:: TRANS NPN 40V 1A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,152

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

Product details

Overview

PBSS4140S,126 from NXP Semiconductors is a 40 V, 1 A low V_CE(sat) NPN transistor in SOT54 (TO-92) package, optimized for medium-power switching with ultra-low saturation voltage (≤500 mV at 1 A), high power dissipation (830 mW), and improved thermal reliability. It serves as a discrete switch in battery-powered portable electronics, DC/DC converters, and LCD back-lighting circuits.

For engineers reviewing the PBSS4140S,126 datasheet, PBSS4140S,126 pinout, PBSS4140S,126 application, or PBSS4140S,126 equivalent, key selection criteria include verified V_CE(sat) ≤500 mV at I_C = 1 A, R_CE(sat) < 500 mΩ, h_FE ≥200 at 1 A, T_j max = 150 °C, and SOT54 through-hole mechanical compatibility.

Technical Context

The PBSS4140S,126 employs a low-saturation-voltage bipolar process enabling efficient switching at high current density without excessive heat generation. Its design targets linear regulators and supply-line switching where minimal conduction loss and stable gain (h_FE = 200–900 across 1 mA–1 A) are critical.

Thermal performance is defined for single-sided PCB mounting (tin-plated copper), with R_th(j-a) = 150 K/W and P_tot = 830 mW at T_amb ≤25 °C. Device reliability is enhanced by reduced junction temperature rise under sustained 1 A DC load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter blocking voltage in open-base configuration.
I_C (DC)	1 A - Continuous collector current rating defining steady-state switching capacity.
V_CE(sat)	≤500 mV at I_C = 1 A, I_B = 100 mA - Ensures <0.5 W conduction loss per device in high-current on-state.
R_CE(sat)	<500 mΩ - Equivalent on-resistance supporting low-loss operation comparable to small-signal MOSFETs.
h_FE	200–900 - DC current gain range enabling robust base drive design across 1 mA–1 A operating points.
P_tot	830 mW - Total power dissipation limit at 25 °C ambient, directly constraining thermal layout requirements.
f_T	150 MHz - Transition frequency confirming suitability for medium-speed switching (e.g., PWM up to ~10 MHz).

Pinout & Package

SOT54 (TO-92) plastic through-hole package with standard 2.54 mm lead pitch, 5.2 mm body length, and 4.8 mm body width. Designed for manual or wave soldering on single-sided PCBs with tin-plated copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal requiring ~100 mA DC drive to saturate at 1 A collector current.
2	Collector	Main high-side or low-side current path; electrically connected to metal tab in some variants (not applicable here).
3	Emitter	Reference terminal for bias network; tied to ground or common return in most switching configurations.

Key Features

Feature	Design Value
Ultra-low V_CE(sat)	≤500 mV at full 1 A load reduces conduction loss by >50% vs. standard general-purpose transistors.
High power dissipation	830 mW rating enables operation at elevated ambient temperatures without derating below 1 A.
Wide h_FE range	200–900 supports consistent turn-on across production lots and temperature extremes (−55 °C to +150 °C).
Low R_CE(sat)	<500 mΩ simplifies gate-drive replacement in low-voltage logic-level switching applications.
Thermal robustness	Junction temperature rating of 150 °C ensures long-term reliability in compact battery-powered enclosures.

Applications

Mobile Phone Power Management	LCD Back-light Driver
Use Scenario: Switching main battery rail to camera flash LED or audio amplifier during burst operation. IC Role / Device Role / Timing Role: Discrete NPN switch controlling 1 A peak load with minimal voltage drop and self-heating. Use Value: Enables >95% power delivery efficiency at 3.7 V input due to V_CE(sat) ≤500 mV, extending battery runtime.	Use Scenario: Driving CCFL or white LED strings in handheld display modules requiring regulated current pulses. IC Role / Device Role / Timing Role: Linear or PWM-controlled current sink in constant-current backlight stage. Use Value: Stable h_FE and low V_CE(sat) ensure precise current regulation across temperature and unit-to-unit variation.
DC/DC Converter Sync Rectifier	Linear Regulator Pass Element
Use Scenario: Replacing Schottky diode in low-voltage buck converter output stage to reduce forward loss. IC Role / Device Role / Timing Role: Synchronously switched NPN transistor acting as active rectifier during low-side conduction phase. Use Value: R_CE(sat) < 500 mΩ cuts conduction loss by ~40% vs. 0.4 V Schottky, improving light-load efficiency.	Use Scenario: Series pass element in 5 V or 3.3 V linear regulator supplying microcontroller core voltage. IC Role / Device Role / Timing Role: Voltage-controlled current source dissipating excess input-output differential as heat. Use Value: 830 mW P_tot and 150 °C T_j allow reliable operation with 2 V dropout at 500 mA without heatsink.

Mobile Phone Power Management

LCD Back-light Driver

Use Scenario: Switching main battery rail to camera flash LED or audio amplifier during burst operation.

IC Role / Device Role / Timing Role: Discrete NPN switch controlling 1 A peak load with minimal voltage drop and self-heating.

Use Value: Enables >95% power delivery efficiency at 3.7 V input due to V_CE(sat) ≤500 mV, extending battery runtime.

Use Scenario: Driving CCFL or white LED strings in handheld display modules requiring regulated current pulses.

IC Role / Device Role / Timing Role: Linear or PWM-controlled current sink in constant-current backlight stage.

Use Value: Stable h_FE and low V_CE(sat) ensure precise current regulation across temperature and unit-to-unit variation.

DC/DC Converter Sync Rectifier

Linear Regulator Pass Element

Use Scenario: Replacing Schottky diode in low-voltage buck converter output stage to reduce forward loss.

IC Role / Device Role / Timing Role: Synchronously switched NPN transistor acting as active rectifier during low-side conduction phase.

Use Value: R_CE(sat) < 500 mΩ cuts conduction loss by ~40% vs. 0.4 V Schottky, improving light-load efficiency.

Use Scenario: Series pass element in 5 V or 3.3 V linear regulator supplying microcontroller core voltage.

IC Role / Device Role / Timing Role: Voltage-controlled current source dissipating excess input-output differential as heat.

Use Value: 830 mW P_tot and 150 °C T_j allow reliable operation with 2 V dropout at 500 mA without heatsink.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT4401LT1G	V_CE(sat) = 750 mV @ 150 mA (not rated at 1 A); h_FE min = 100; P_tot = 310 mW	Lower current capability limits use to sub-500 mA loads; unsuitable for sustained 1 A switching.	Select PBSS4140S,126 when ≥1 A DC current and <500 mV V_CE(sat) are required.
ZTX653	V_CE(sat) = 600 mV @ 1 A; P_tot = 1 W; SOT89 package (surface-mount)	Higher power handling but requires rework for through-hole footprint; no direct SOT54 pinout match.	Choose PBSS4140S,126 for legacy TO-92 board compatibility and guaranteed ≤500 mV saturation at 1 A.

Compared with MMBT4401LT1G and ZTX653, the PBSS4140S,126 uniquely combines SOT54 through-hole form factor, 1 A DC rating, and ≤500 mV V_CE(sat)-enabling drop-in upgrades in space-constrained portable designs without layout change or thermal redesign.

Availability

PBSS4140S,126 is available at Aetrix Electronics and suitable for mobile phone power management, LCD back-lighting, and DC/DC converter applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for PBSS4140S,126 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.

The PBSS4140S,126 belongs to NXP's low V_CE(sat) transistor family, engineered specifically for energy-efficient switching in battery-operated portable devices where thermal headroom and conduction loss are critical constraints.

FAQ

What is the maximum continuous collector current for PBSS4140S,126?

The PBSS4140S,126 supports a maximum continuous collector current (I_C) of 1 A at T_amb ≤25 °C with proper PCB thermal relief. Derating applies above 25 °C ambient per the thermal resistance R_th(j-a) = 150 K/W. This rating is validated in the official NXP product data sheet dated 2004 Aug 20 and confirmed across all production lots of PBSS4140S,126.

Does PBSS4140S,126 have a PNP complement?

Yes, the PNP complement to PBSS4140S,126 is PBSS5140S. Both share identical voltage ratings (40 V), current capability (1 A), and SOT54 packaging. The PBSS5140S provides matched performance for complementary switching stages, such as H-bridge drivers or push-pull regulators, ensuring balanced conduction characteristics in dual-rail designs.

What is the typical V_CE(sat) of PBSS4140S,126 at 1 A collector current?

The typical V_CE(sat) of PBSS4140S,126 is 500 mV at I_C = 1 A and I_B = 100 mA, with a guaranteed maximum of 500 mV under those conditions. This value is specified in the "Characteristics" section of the NXP datasheet and reflects the device's ultra-low saturation design, enabling high-efficiency operation in power-switching roles.

Is PBSS4140S,126 suitable for surface-mount assembly?

No, PBSS4140S,126 uses the SOT54 (TO-92) through-hole package with three axial leads designed for insertion and wave soldering. It is not compatible with standard SMT reflow processes. For surface-mount equivalents, consider NXP's PBSS4140PAS (SOT1123) or other low-V_CE(sat) SMD transistors-but these require PCB layout changes and are not pin-compatible with PBSS4140S,126.

What is the storage temperature range for PBSS4140S,126?

The storage temperature range for PBSS4140S,126 is −65 °C to +150 °C, as defined in the Absolute Maximum Ratings table of the NXP product data sheet. This wide range supports long-term warehouse storage and operation in extreme environmental conditions, including automotive under-hood and industrial outdoor deployments.

PBSS4140S,126 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

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

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 500mA, 5V

Power - Max:: 830 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

PBSS4140S,126 FAQ

1.How can I place an order for PBSS4140S,126 through Aetrix?

Please submit a Request for Quotation (RFQ) for PBSS4140S,126 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 PBSS4140S,126 reliable?

The price and inventory of PBSS4140S,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBSS4140S,126 is usually 5 days.

3.What payment methods are accepted for PBSS4140S,126?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBSS4140S,126 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PBSS4140S,126?

PBSS4140S,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PBSS4140S,126 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 PBSS4140S,126?

For technical support, including PBSS4140S,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBSS4140S,126 requirements.

6.How does Aetrix verify that PBSS4140S,126 is sourced from the original manufacturer or authorized distributors?

All PBSS4140S,126 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 PBSS4140S,126 meets industry standards.

7.What is the process for return or replacement of PBSS4140S,126?

All PBSS4140S,126 units undergo pre-shipment inspection (PSI). If there is an issue with PBSS4140S,126, 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 PBSS4140S,126 part is unused and in its original packaging.

Return procedure for PBSS4140S,126:

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…