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

NXP Semiconductors MPS3906,126

Name: MPS3906,126
Brand: NXP Semiconductors
SKU: MPS3906,126
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPS3906,126

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

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

Datasheet:: MPS3906,126.pdf

Description:: TRANS PNP 40V 0.1A TO-92-3

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Product details

Overview

MPS3906,126 from Nexperia (formerly Philips Semiconductors) is a PNP bipolar junction transistor designed for low-voltage, low-current switching and amplification. It features −40 V collector-emitter voltage, −100 mA DC collector current, 150 MHz transition frequency, TO-92 (SOT54/SC-43A) through-hole package, and operates up to 150 °C junction temperature.

For engineers reviewing the MPS3906,126 datasheet, MPS3906,126 pinout, MPS3906,126 application, or MPS3906,126 equivalent, key selection considerations include its PNP polarity, saturation voltage under defined drive conditions, DC current gain across operating currents, thermal resistance, and compatibility with legacy through-hole PCB layouts requiring discrete general-purpose transistors.

Technical Context

The MPS3906,126 implements a silicon planar epitaxial PNP structure optimized for reliable switching in low-power analog and digital circuits. Its design supports fast turn-on (≤100 ns) and controlled storage time (≤600 ns), with base-emitter and collector-base cut-off currents specified at ≤−50 nA.

It delivers DC current gain (h_FE) ranging from 60 at −0.1 mA to 300 at −10 mA, with V_CE(sat) as low as −250 mV at −10 mA/−1 mA drive - enabling efficient operation in saturated-switch configurations without external biasing complexity.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V: Maximum safe collector-emitter voltage with base open; defines upper rail limit in PNP switch applications.
I_C (DC)	−100 mA: Continuous collector current handling capacity; suitable for relay drivers, LED switches, and small-signal logic interfaces.
h_FE	60–300: DC current gain range across −0.1 mA to −10 mA I_C; enables predictable base drive sizing in amplifier and switch designs.
V_CE(sat)	−250 mV (typ.): Low saturation voltage at −10 mA/−1 mA; minimizes power loss and heat generation in on-state switching.
f_T	150 MHz: Transition frequency at −20 V V_CE, −10 mA I_C; supports audio-frequency amplification and fast digital switching.
R_th(j-a)	250 K/W: Junction-to-ambient thermal resistance on FR4 board; informs derating requirements above 25 °C ambient.

Pinout & Package

Package: TO-92 (SOT54 / SC-43A), plastic single-ended leaded through-hole package with 3 leads, 2.54 mm lead pitch, and 14.5 mm body length.

Pin/Terminal	Circuit Role	Design Meaning
1	Collector	Primary current sink terminal; connected to load or higher-potential rail in PNP switch configuration.
2	Base	Control input; negative current injection turns device on; requires current-limiting resistor in most applications.
3	Emitter	Current source terminal; typically tied to positive supply rail in common-emitter switching topologies.

Key Features

Feature	Design Value
Low-voltage PNP switching	Rated for −40 V V_CEO and −40 V V_CBO, supporting 3.3 V, 5 V, and 12 V rail applications with margin.
Fast switching performance	Turn-on time ≤100 ns and storage time ≤600 ns enable use in kHz-range digital logic and pulse-width modulation circuits.
Stable DC current gain	h_FE ≥60 at −0.1 mA and ≥100 at −10 mA ensures consistent amplification and predictable base drive across operating range.
Low saturation voltage	V_CE(sat) ≤−400 mV at −50 mA/−5 mA allows efficient conduction with minimal voltage drop and self-heating.

Applications

LED Driver Circuit	Level-Shifting Interface
Use Scenario: Driving indicator LEDs from microcontroller GPIO pins operating at 3.3 V or 5 V logic levels. IC Role / Device Role / Timing Role: PNP switch sinking current from LED anode to V_CC, enabling active-low control with logic-compatible base drive. Use Value: −250 mV V_CE(sat) preserves LED forward voltage headroom; TO-92 package simplifies hand-soldering and prototyping.	Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-supply systems. IC Role / Device Role / Timing Role: Inverting level shifter using common-emitter configuration with pull-up resistor on collector. Use Value: 150 MHz f_T supports clean edge transitions up to ~10 MHz; low C_c (5 pF) minimizes signal distortion.
Relay Control Module	Audio Pre-amplifier Stage
Use Scenario: Switching 5 V or 12 V relay coils in industrial control panels and appliance PCBs. IC Role / Device Role / Timing Role: Saturated PNP switch providing coil current path from V_CC to ground via emitter-follower or common-emitter topology. Use Value: −100 mA I_C rating exceeds typical relay coil currents (20–70 mA); robust 150 °C T_j supports enclosed environments.	Use Scenario: Low-noise voltage amplification stage in microphone preamps or sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Common-emitter amplifier biased at −1 mA I_C, leveraging h_FE ≥80 and 4 dB noise figure. Use Value: 4 dB noise figure at 10 Hz–15.7 kHz and stable h_FE ensure high signal integrity in audio-band amplification.

LED Driver Circuit

Level-Shifting Interface

Use Scenario: Driving indicator LEDs from microcontroller GPIO pins operating at 3.3 V or 5 V logic levels.

IC Role / Device Role / Timing Role: PNP switch sinking current from LED anode to V_CC, enabling active-low control with logic-compatible base drive.

Use Value: −250 mV V_CE(sat) preserves LED forward voltage headroom; TO-92 package simplifies hand-soldering and prototyping.

Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-supply systems.

IC Role / Device Role / Timing Role: Inverting level shifter using common-emitter configuration with pull-up resistor on collector.

Use Value: 150 MHz f_T supports clean edge transitions up to ~10 MHz; low C_c (5 pF) minimizes signal distortion.

Relay Control Module

Audio Pre-amplifier Stage

Use Scenario: Switching 5 V or 12 V relay coils in industrial control panels and appliance PCBs.

IC Role / Device Role / Timing Role: Saturated PNP switch providing coil current path from V_CC to ground via emitter-follower or common-emitter topology.

Use Value: −100 mA I_C rating exceeds typical relay coil currents (20–70 mA); robust 150 °C T_j supports enclosed environments.

Use Scenario: Low-noise voltage amplification stage in microphone preamps or sensor signal conditioning circuits.

IC Role / Device Role / Timing Role: Common-emitter amplifier biased at −1 mA I_C, leveraging h_FE ≥80 and 4 dB noise figure.

Use Value: 4 dB noise figure at 10 Hz–15.7 kHz and stable h_FE ensure high signal integrity in audio-band amplification.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3906	SOT-23 surface-mount package; identical electrical specs but 300 mW P_tot vs. 500 mW for MPS3906,126.	Requires rework of through-hole layout; suited for space-constrained, automated assembly.	Select MMBT3906 only when SMT footprint and reduced power dissipation are acceptable.
BC557B	Higher h_FE bin (200–450); same TO-92 package; V_CEO = −45 V; P_tot = 500 mW.	Offers tighter gain tolerance and extended voltage margin; pinout identical to MPS3906,126.	Choose BC557B where higher and more consistent DC gain is required without changing layout.

Compared with MMBT3906 and BC557B, the MPS3906,126 provides optimal balance of proven through-hole reliability, 500 mW power handling, and broad h_FE range - making it preferred for prototyping, repair, and legacy industrial designs where manual assembly or thermal margin is critical.

Availability

MPS3906,126 is available at Aetrix Electronics and suitable for LED driver circuits, relay control modules, and level-shifting interfaces requiring stable component supply, long-term obsolescence management, and through-hole manufacturing compatibility.

Supply support for MPS3906,126 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions - spun off from Philips Semiconductors in 2017 and now part of Beijing JianGuang Asset Management Co., Ltd.

The MPS3906,126 belongs to Nexperia's legacy general-purpose bipolar transistor family, engineered for cost-effective, robust switching and amplification in industrial controls, consumer electronics, and automotive body electronics.

FAQ

What is the maximum continuous collector current for the MPS3906,126?

The MPS3906,126 has a maximum DC collector current (I_C) of −100 mA at T_amb ≤25 °C. Derating is required above this ambient temperature per its 250 K/W thermal resistance. This rating supports common low-power switching tasks such as driving LEDs, small relays, and logic-level translation without forced cooling.

Is the MPS3906,126 pin-compatible with the NPN MPS3904?

Yes, the MPS3906,126 is the PNP complement to the NPN MPS3904 and shares identical TO-92 (SOT54) pinout: Pin 1 = collector, Pin 2 = base, Pin 3 = emitter. However, polarity reversal means circuit topology must be adapted - e.g., supply connections and signal inversion - when substituting between them.

What is the typical V_CE(sat) of the MPS3906,126 under standard switching conditions?

The MPS3906,126 exhibits a typical collector-emitter saturation voltage (V_CE(sat)) of −250 mV at I_C = −10 mA and I_B = −1 mA. At higher drive (−50 mA/−5 mA), V_CE(sat) remains ≤−400 mV. These values ensure minimal conduction loss in saturated-switch applications like load switching and digital interfacing.

Does the MPS3906,126 support audio-frequency amplification?

Yes, the MPS3906,126 supports audio-frequency amplification with a transition frequency (f_T) of 150 MHz and a noise figure of 4 dB at 10 Hz–15.7 kHz. Its h_FE stability across I_C = −0.1 mA to −10 mA and low C_c (5 pF) make it suitable for low-gain pre-amplifier stages in microphones and sensor signal chains.

What is the thermal resistance junction-to-ambient for the MPS3906,126?

The MPS3906,126 has a thermal resistance from junction to ambient (R_th(j-a)) of 250 K/W when mounted on a standard FR4 printed-circuit board. This value assumes natural convection and no heatsink; designers must apply appropriate derating curves above 25 °C ambient to maintain T_j ≤150 °C.

MPS3906,126 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

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

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

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 5mA, 50mA

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

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

Power - Max:: 500 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

MPS3906,126 FAQ

1.How can I place an order for MPS3906,126 through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS3906,126 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 MPS3906,126 reliable?

The price and inventory of MPS3906,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS3906,126 is usually 5 days.

3.What payment methods are accepted for MPS3906,126?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS3906,126 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS3906,126?

MPS3906,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS3906,126 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 MPS3906,126?

For technical support, including MPS3906,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS3906,126 requirements.

6.How does Aetrix verify that MPS3906,126 is sourced from the original manufacturer or authorized distributors?

All MPS3906,126 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 MPS3906,126 meets industry standards.

7.What is the process for return or replacement of MPS3906,126?

All MPS3906,126 units undergo pre-shipment inspection (PSI). If there is an issue with MPS3906,126, 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 MPS3906,126 part is unused and in its original packaging.

Return procedure for MPS3906,126:

1.Submit a request within 90 days.

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

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