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

onsemi 2N3906_J61Z

Name: 2N3906_J61Z
Brand: onsemi
SKU: 2N3906_J61Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N3906_J61Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N3906_J61Z.pdf

Description:: TRANS PNP 40V 0.2A TO-92-3

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Product details

Overview

2N3906_J61Z from onsemi is a PNP bipolar junction transistor (BJT) designed for general-purpose amplification and switching at collector currents from 10 mA to 100 mA. It features a TO-92 package with J61Z lead form, −40 V V_CEO, −200 mA I_C, and DC current gain (h_FE) ranging from 60 to 300 depending on bias conditions. It is commonly used in low-power signal inversion, discrete logic level shifting, and LED driver stages.

For engineers reviewing the 2N3906_J61Z datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, TO-92 J61Z mechanical configuration, guaranteed V_CEO/I_C ratings, saturation voltage at defined drive conditions, and thermal resistance (R_θJA = 200 °C/W) for ambient-limited PCB designs.

Technical Context

The 2N3906_J61Z operates as a silicon PNP BJT with base-emitter and base-collector junctions optimized for linear amplification and saturated switching. Its h_FE varies predictably across I_C (−0.1 mA to −100 mA), supporting both analog gain staging and digital on/off control.

It exhibits verified small-signal performance including f_T = 250 MHz at I_C = −10 mA, C_obo = 4.5 pF, and NF = 4.0 dB at 10 Hz–15.7 kHz - confirming suitability for audio-frequency amplification and low-speed digital switching with controlled rise/fall times (t_r/t_f = 35/75 ns).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V: Maximum reverse-biased collector-emitter voltage before breakdown; sets safe operating range in common-emitter switch/amplifier topologies.
I_C	−200 mA: Continuous collector current limit; defines maximum load-handling capability in saturated switching applications.
h_FE	60–300: DC current gain range across I_C = −0.1 mA to −50 mA; determines required base drive for target collector current in linear or switch modes.
V_CE(sat)	−0.25 V @ I_C = −10 mA, I_B = −1 mA: Low saturation voltage ensures minimal power loss and heat generation when fully turned on.
f_T	250 MHz: Unity-gain frequency confirms usable bandwidth up to ~25 MHz for small-signal amplification with stable gain.
R_θJA	200 °C/W: Junction-to-ambient thermal resistance on standard FR-4 board; enables derating calculation for reliable operation at elevated ambient temperatures.

Pinout & Package

2N3906_J61Z uses the TO-92 package with J61Z lead form - a molded, straight-lead variant compliant with JEDEC TO-92 standards and optimized for automated insertion. The device has three terminals arranged in E-B-C order (Emitter–Base–Collector) when viewed with flat side facing outward and leads pointing down.

Pin/Terminal	Circuit Role	Design Meaning
Lead 1 (Left)	Emitter (E)	Current exit path for PNP device; connects to higher potential rail in common-emitter configurations.
Lead 2 (Center)	Base (B)	Control terminal; negative voltage relative to emitter turns device on; requires current-limited drive for predictable h_FE-based operation.
Lead 3 (Right)	Collector (C)	Current entry path; connects to load and lower-potential node; must remain ≤ V_CEO below emitter voltage.

Key Features

Feature	Design Value
PNP polarity with −40 V rating	Enables high-side switching and complementary pair use with NPN devices like 2N3904 in push-pull or differential amplifier stages.
Guaranteed h_FE ≥ 60 at I_C = −0.1 mA	Ensures reliable turn-on and gain stability in low-current bias networks such as sensor interface preamplifiers.
V_CE(sat) ≤ −0.40 V @ I_C = −50 mA	Supports efficient switching of moderate loads (e.g., relays, LEDs) without excessive voltage drop or self-heating.
Low noise figure (NF = 4.0 dB)	Validates suitability for low-level audio and instrumentation signal amplification where SNR preservation is critical.

Applications

Audio Signal Inversion	Discrete Logic Level Shifting
Use Scenario: Inverting an audio signal in a single-supply headphone amplifier stage using a common-emitter configuration. IC Role / Device Role / Timing Role: PNP BJT configured as a voltage-inverting amplifier with fixed bias network and emitter degeneration resistor. Use Value: Delivers clean gain with <4.0 dB noise figure and stable h_FE across 20 Hz–20 kHz, avoiding crossover distortion in Class-A operation.	Use Scenario: Converting 3.3 V logic HIGH to 5 V logic LOW in mixed-voltage microcontroller interfacing. IC Role / Device Role / Timing Role: PNP switch pulling a 5 V bus to ground when driven by a 3.3 V GPIO output. Use Value: Achieves sub-100 ns switching with t_f = 75 ns and low V_CE(sat), enabling reliable level translation without external pull-up conflicts.
LED Driver Stage	Complementary Pair Amplifier
Use Scenario: Driving a 20 mA indicator LED from a microcontroller GPIO pin via saturated switching. IC Role / Device Role / Timing Role: PNP BJT operated in saturation mode with base resistor limiting I_B to ensure full turn-on. Use Value: Maintains V_CE(sat) ≤ −0.25 V at I_C = −10 mA, minimizing power dissipation (<2.5 mW) and thermal stress on TO-92 package.	Use Scenario: Forming a Class AB push-pull output stage with 2N3904 to drive a 1 kΩ load in a line driver circuit. IC Role / Device Role / Timing Role: PNP half of complementary emitter-follower pair providing current sourcing capability. Use Value: Matches 2N3904's f_T and capacitance profile (C_obo = 4.5 pF), ensuring symmetrical slew rate and reduced crossover distortion.

Audio Signal Inversion

Discrete Logic Level Shifting

Use Scenario: Inverting an audio signal in a single-supply headphone amplifier stage using a common-emitter configuration.

IC Role / Device Role / Timing Role: PNP BJT configured as a voltage-inverting amplifier with fixed bias network and emitter degeneration resistor.

Use Value: Delivers clean gain with <4.0 dB noise figure and stable h_FE across 20 Hz–20 kHz, avoiding crossover distortion in Class-A operation.

Use Scenario: Converting 3.3 V logic HIGH to 5 V logic LOW in mixed-voltage microcontroller interfacing.

IC Role / Device Role / Timing Role: PNP switch pulling a 5 V bus to ground when driven by a 3.3 V GPIO output.

Use Value: Achieves sub-100 ns switching with t_f = 75 ns and low V_CE(sat), enabling reliable level translation without external pull-up conflicts.

LED Driver Stage

Complementary Pair Amplifier

Use Scenario: Driving a 20 mA indicator LED from a microcontroller GPIO pin via saturated switching.

IC Role / Device Role / Timing Role: PNP BJT operated in saturation mode with base resistor limiting I_B to ensure full turn-on.

Use Value: Maintains V_CE(sat) ≤ −0.25 V at I_C = −10 mA, minimizing power dissipation (<2.5 mW) and thermal stress on TO-92 package.

Use Scenario: Forming a Class AB push-pull output stage with 2N3904 to drive a 1 kΩ load in a line driver circuit.

IC Role / Device Role / Timing Role: PNP half of complementary emitter-follower pair providing current sourcing capability.

Use Value: Matches 2N3904's f_T and capacitance profile (C_obo = 4.5 pF), ensuring symmetrical slew rate and reduced crossover distortion.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3906	SOT-23 package, R_θJA = 357 °C/W, I_C = −200 mA, same electrical specs.	Surface-mount compatible; higher thermal resistance limits power handling in compact layouts.	Select MMBT3906 for space-constrained PCBs requiring reflow assembly; verify layout cooling for >50 mA continuous operation.
PZT3906	SOT-223 package, R_θJA = 125 °C/W, PD = 1000 mW, same electrical specs.	Higher power dissipation capability; requires larger land pattern and heatsinking for full-rating use.	Select PZT3906 when sustained >100 mA collector current or >500 mW dissipation is required in industrial control modules.

Compared with MMBT3906 and PZT3906, the 2N3906_J61Z offers through-hole TO-92 reliability and ease of prototyping while maintaining identical core transistor characteristics - making it ideal for breadboard validation, low-volume production, and legacy through-hole designs where mechanical robustness and manual assembly are priorities.

Availability

2N3906_J61Z is available at Aetrix Electronics and suitable for audio signal inversion, discrete logic level shifting, and LED driver stages requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for 2N3906_J61Z 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

onsemi is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 2N3906_J61Z belongs to onsemi's legacy general-purpose transistor product line, engineered for broad compatibility, manufacturability, and reliability in cost-sensitive, medium-performance analog and digital circuits.

FAQ

What is the pin configuration of the 2N3906_J61Z?

The 2N3906_J61Z uses a TO-92 package with J61Z lead form and E-B-C pinout: when viewing the flat side with leads downward, left-to-right is Emitter–Base–Collector. This matches JEDEC TO-92 standard orientation and is confirmed in Figure 17 of the onsemi PZT3906/D datasheet.

Does the 2N3906_J61Z support switching applications?

Yes, the 2N3906_J61Z supports switching applications with verified td = 35 ns, tr = 35 ns, ts = 225 ns, and tf = 75 ns at I_C = −10 mA. Its V_CE(sat) ≤ −0.25 V ensures low conduction loss, and its PNP structure enables high-side switching in discrete power control circuits.

What is the maximum power dissipation of the 2N3906_J61Z?

The 2N3906_J61Z has a total device dissipation (P_D) of 625 mW at T_A = 25°C, with a derating factor of 5.0 mW/°C above that temperature. This value assumes mounting on a standard FR-4 PCB per onsemi's thermal test condition (Note 2 in datasheet).

Is the 2N3906_J61Z RoHS compliant?

Yes, the 2N3906_J61Z is RoHS compliant and meets EU Directive 2011/65/EU requirements. onsemi confirms RoHS status for all TO-92 packaged 2N3906 variants including J61Z in their official product change notifications and compliance documentation.

How does the 2N3906_J61Z compare to the 2N3904?

The 2N3906_J61Z is the PNP complement to the NPN 2N3904, sharing identical package options, absolute maximum ratings (except polarity), and many electrical characteristics. Key differences include opposite polarity, −40 V V_CEO vs. +40 V V_CEO, and mirrored h_FE and V_BE(sat) curves - enabling direct pairing in differential or push-pull circuits.

2N3906_J61Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 200 mA

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

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

Current - Collector Cutoff (Max):: -

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

Power - Max:: 625 mW

Frequency - Transition:: 250MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

2N3906_J61Z FAQ

1.How can I place an order for 2N3906_J61Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N3906_J61Z 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 2N3906_J61Z reliable?

The price and inventory of 2N3906_J61Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N3906_J61Z is usually 5 days.

3.What payment methods are accepted for 2N3906_J61Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N3906_J61Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N3906_J61Z?

2N3906_J61Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N3906_J61Z 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 2N3906_J61Z?

For technical support, including 2N3906_J61Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N3906_J61Z requirements.

6.How does Aetrix verify that 2N3906_J61Z is sourced from the original manufacturer or authorized distributors?

All 2N3906_J61Z 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 2N3906_J61Z meets industry standards.

7.What is the process for return or replacement of 2N3906_J61Z?

All 2N3906_J61Z units undergo pre-shipment inspection (PSI). If there is an issue with 2N3906_J61Z, 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 2N3906_J61Z part is unused and in its original packaging.

Return procedure for 2N3906_J61Z:

1.Submit a request within 90 days.

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

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