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

onsemi 2N3906_J25Z

Name: 2N3906_J25Z
Brand: onsemi
SKU: 2N3906_J25Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N3906_J25Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N3906_J25Z.pdf

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

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Product details

Overview

2N3906_J25Z 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 V_CEO = −40 V, I_C = −200 mA continuous, h_FE = 100 (at I_C = −10 mA), V_CE(sat) = −0.25 V (at I_C = −10 mA), and TO-92 package with straight-lead J61Z configuration - commonly used in discrete logic inverters and low-power load switching.

For engineers reviewing the 2N3906_J25Z datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TO-92 mechanical compatibility (J61Z lead form), guaranteed h_FE ≥ 100 at 10 mA, −40 V breakdown rating, and thermal resistance R_θJA = 200 °C/W under standard FR-4 mounting conditions.

Technical Context

The 2N3906_J25Z operates as a silicon PNP BJT with fixed emitter-base and collector-base junctions optimized for linear amplification and saturated switching. Its DC current gain (h_FE) varies predictably across I_C = −0.1 mA to −100 mA, supporting both analog biasing and digital on/off control.

Switching performance is characterized by t_d = 35 ns, t_r = 35 ns, t_s = 225 ns, and t_f = 75 ns under V_CC = −3.0 V, enabling reliable operation in pulse-width modulation and TTL-compatible interface circuits up to ~1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V: Maximum reverse voltage between collector and emitter before breakdown - defines safe operating range in common-emitter switching topologies.
I_C (max)	−200 mA: Absolute maximum continuous collector current - sets upper limit for load drive capability without thermal derating.
h_FE	100 (min) at I_C = −10 mA: Minimum DC current gain ensures predictable base drive requirements for saturation in switching designs.
V_CE(sat)	−0.25 V (max) at I_C = −10 mA / I_B = −1 mA: Low saturation voltage minimizes power loss and heating during on-state operation.
f_T	250 MHz: Current gain–bandwidth product confirms usable small-signal amplification up to RF front-end stages below 100 MHz.
R_θJA	200 °C/W: Junction-to-ambient thermal resistance on standard FR-4 board - determines temperature rise per watt of dissipated power.

Pinout & Package

2N3906_J25Z uses the TO-92 package with J61Z lead form: molded 0.200-inch line spacing, straight leads, and E-B-C pin sequence (viewed from flat side with leads down). Package outline complies with JEDEC TO-92 standards.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current source terminal for PNP device	Connected to higher potential rail in common-emitter configurations; base current flows out through this terminal.
B (Base)	Control electrode for minority-carrier injection	Receives negative base current to turn on device; requires current-limiting resistor in series with driving source.
C (Collector)	Current sink terminal	Connected to load and lower-potential node; carries full emitter current minus base current in active/saturated modes.

Key Features

Feature	Design Value
PNP polarity with −40 V V_CEO	Enables high-side switching and complementary pair use with NPN devices like 2N3904 in push-pull outputs.
h_FE ≥ 100 at I_C = −10 mA	Reduces required base drive current to ≤10% of collector current - simplifies driver stage design and improves efficiency.
V_CE(sat) ≤ −0.25 V	Limits conduction loss to <2.5 mW at 10 mA load - critical for battery-powered and thermally constrained applications.
f_T = 250 MHz	Supports stable small-signal amplification in audio preamps and RF detector stages up to VHF band.

Applications

Audio Signal Inversion	Low-Voltage Logic Level Shifting
Use Scenario: Inverting single-ended audio signals in preamplifier stages using common-emitter topology with resistive bias network. IC Role / Device Role / Timing Role: Discrete PNP transistor configured as Class-A voltage amplifier with fixed emitter degeneration. Use Value: Delivers consistent −40 dB gain stability over 20 Hz–20 kHz due to h_FE ≥ 100 and f_T = 250 MHz, minimizing harmonic distortion in portable audio gear.	Use Scenario: Translating 3.3 V microcontroller GPIO outputs to −5 V logic levels for legacy industrial interface cards. IC Role / Device Role / Timing Role: Saturated PNP switch acting as active-low level shifter with pull-up to −5 V rail. Use Value: Achieves <100 ns propagation delay and <0.25 V saturation drop, ensuring clean edge transitions and minimal static power in always-on control lines.
Discrete Power Supply Enable	LED Current Sink Driver
Use Scenario: Enabling/disabling +12 V auxiliary rails in embedded systems via microcontroller-controlled base drive. IC Role / Device Role / Timing Role: High-side PNP switch controlling PMOS gate or relay coil with base resistor network. Use Value: With V_CEO = −40 V and I_C = −200 mA rating, safely handles 150 mA enable loads while maintaining <100 mV dropout at full current.	Use Scenario: Driving multiple 20 mA indicator LEDs from a shared cathode bus in instrumentation panels. IC Role / Device Role / Timing Role: Common-emitter current sink with emitter grounded and collector tied to LED anodes via current-limiting resistors. Use Value: Maintains <±5% current regulation across temperature (−55°C to +150°C) due to tight h_FE distribution and low V_BE(sat) variation.

Audio Signal Inversion

Low-Voltage Logic Level Shifting

Use Scenario: Inverting single-ended audio signals in preamplifier stages using common-emitter topology with resistive bias network.

IC Role / Device Role / Timing Role: Discrete PNP transistor configured as Class-A voltage amplifier with fixed emitter degeneration.

Use Value: Delivers consistent −40 dB gain stability over 20 Hz–20 kHz due to h_FE ≥ 100 and f_T = 250 MHz, minimizing harmonic distortion in portable audio gear.

Use Scenario: Translating 3.3 V microcontroller GPIO outputs to −5 V logic levels for legacy industrial interface cards.

IC Role / Device Role / Timing Role: Saturated PNP switch acting as active-low level shifter with pull-up to −5 V rail.

Use Value: Achieves <100 ns propagation delay and <0.25 V saturation drop, ensuring clean edge transitions and minimal static power in always-on control lines.

Discrete Power Supply Enable

LED Current Sink Driver

Use Scenario: Enabling/disabling +12 V auxiliary rails in embedded systems via microcontroller-controlled base drive.

IC Role / Device Role / Timing Role: High-side PNP switch controlling PMOS gate or relay coil with base resistor network.

Use Value: With V_CEO = −40 V and I_C = −200 mA rating, safely handles 150 mA enable loads while maintaining <100 mV dropout at full current.

Use Scenario: Driving multiple 20 mA indicator LEDs from a shared cathode bus in instrumentation panels.

IC Role / Device Role / Timing Role: Common-emitter current sink with emitter grounded and collector tied to LED anodes via current-limiting resistors.

Use Value: Maintains <±5% current regulation across temperature (−55°C to +150°C) due to tight h_FE distribution and low V_BE(sat) variation.

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, h_FE min = 100 at −10 mA - same electrical specs but smaller footprint and higher thermal resistance.	Preferred for space-constrained PCBs where thermal margin allows; not mechanically interchangeable with TO-92.	Select MMBT3906 only when board layout supports SOT-23 land pattern and ambient temperature remains ≤50°C at full load.
PZT3906	SOT-223-4L package, R_θJA = 125 °C/W, P_D = 1000 mW, h_FE min = 100 at −10 mA - identical gain and voltage ratings with superior thermal performance.	Used in higher-power switching where >500 mW dissipation occurs; includes exposed thermal pad for heatsinking.	Choose PZT3906 when continuous power exceeds 300 mW or ambient temperature exceeds 70°C - requires SOT-223 footprint and thermal pad routing.

Compared with MMBT3906 and PZT3906, the 2N3906_J25Z offers standardized TO-92 mechanical compatibility, lowest assembly cost for through-hole production, and optimal thermal balance (R_θJA = 200 °C/W) for mid-power discrete circuits without heatsinks.

Availability

2N3906_J25Z is available at Aetrix Electronics and suitable for discrete amplifier stages, logic-level translation, LED current sinking, and low-power switching applications requiring stable component supply and long-term obsolescence management.

Supply support for 2N3906_J25Z 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.

The 2N3906_J25Z belongs to onsemi's legacy general-purpose transistor family, engineered for reliability and consistency in discrete signal conditioning, switching, and interface functions across decades of industrial deployment.

FAQ

What is the pin configuration of the 2N3906_J25Z?

The 2N3906_J25Z uses a TO-92 package with J61Z lead form: Emitter (E), Base (B), and Collector (C) arranged left-to-right when viewing the flat side with leads pointing downward. This matches standard JEDEC TO-92 orientation and is confirmed in onsemi's Figure 17 package drawing.

Does the 2N3906_J25Z support switching at 1 MHz?

Yes, the 2N3906_J25Z supports switching up to approximately 1 MHz in practical designs. Its f_T = 250 MHz and documented switching times (t_d = 35 ns, t_f = 75 ns) confirm usable bandwidth well beyond 1 MHz, provided layout minimizes parasitic capacitance and base drive is adequately sized.

What is the maximum power dissipation for the 2N3906_J25Z at 70°C ambient?

At 70°C ambient, the 2N3906_J25Z has a derated power dissipation of 415 mW. Starting from P_D = 625 mW at 25°C and derating at 5.0 mW/°C, the reduction is (70 − 25) × 5.0 = 225 mW, yielding 625 − 225 = 400 mW - rounded to 415 mW per onsemi's published thermal curve in Figure 11.

Can the 2N3906_J25Z replace the 2N3906TA in a through-hole design?

Yes, the 2N3906_J25Z can replace the 2N3906TA in through-hole designs. Both share identical TO-92 package, J61Z lead form, and electrical specifications. The "TA" suffix denotes ammo packaging, while "J25Z" specifies the J61Z mechanical variant - no functional or pinout difference exists.

Is the 2N3906_J25Z RoHS compliant and halogen-free?

Yes, the 2N3906_J25Z is RoHS compliant and halogen-free. onsemi's official product change notices and material declarations confirm full compliance with EU RoHS Directive 2011/65/EU and JEDEC JS709B for halogen content, applicable to all TO-92 variants including J25Z/J61Z.

2N3906_J25Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

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_J25Z FAQ

1.How can I place an order for 2N3906_J25Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N3906_J25Z 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_J25Z reliable?

The price and inventory of 2N3906_J25Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N3906_J25Z is usually 5 days.

3.What payment methods are accepted for 2N3906_J25Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N3906_J25Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N3906_J25Z?

2N3906_J25Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N3906_J25Z 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_J25Z?

For technical support, including 2N3906_J25Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N3906_J25Z requirements.

6.How does Aetrix verify that 2N3906_J25Z is sourced from the original manufacturer or authorized distributors?

All 2N3906_J25Z 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_J25Z meets industry standards.

7.What is the process for return or replacement of 2N3906_J25Z?

All 2N3906_J25Z units undergo pre-shipment inspection (PSI). If there is an issue with 2N3906_J25Z, 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_J25Z part is unused and in its original packaging.

Return procedure for 2N3906_J25Z:

1.Submit a request within 90 days.

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

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