onsemi 2N3702_D27Z

Overview

2N3702_D27Z from Fairchild Semiconductor is a PNP epitaxial silicon transistor designed for general-purpose amplification and switching in low-power analog and digital circuits, with V_CEO = −25 V, I_C = −500 mA continuous, h_FE = 60–300 at −50 mA/−5 V, and TO-92 package. It operates across −55°C to +150°C and supports applications such as signal inversion, level shifting, and discrete logic interface stages.

For engineers reviewing the 2N3702_D27Z datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, −25 V V_CEO rating, −500 mA I_C capability, TO-92 mechanical compatibility, and verified h_FE range under standard bias conditions.

Technical Context

This device functions as a medium-current, low-voltage PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its DC current gain (h_FE) is specified from 60 to 300 at V_CE = −5.0 V and I_C = −50 mA, and it delivers V_CE(sat) ≤ −0.25 V at I_C = −50 mA / I_B = −5.0 mA.

Thermal performance is defined by R_θJA = 200°C/W and R_θJC = 83.3°C/W, supporting operation up to +150°C junction temperature. Small-signal parameters include f_T = 100 MHz and C_ob = 12 pF, confirming suitability for audio-frequency amplification and moderate-speed switching.

Key Specifications

Pinout & Package

2N3702_D27Z is housed in a through-hole TO-92 package with standardized lead configuration: Emitter (Pin 1), Collector (Pin 2), Base (Pin 3), viewed from flat side with leads down.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2N3702_D27Z, 2N3906 offers greater voltage headroom but reduced current drive, while MPSA92 trades gain consistency for extreme V_CEO-making 2N3702_D27Z optimal for balanced amplification/switching at ≤−25 V and ≤−500 mA.

Availability

2N3702_D27Z is available at Aetrix Electronics and suitable for audio preamplification, discrete logic interfacing, temperature-stable biasing, and low-power relay driving requiring stable component supply and long-term manufacturability.

Supply support for 2N3702_D27Z 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 2N3702_D27Z belongs to Fairchild's legacy general-purpose bipolar transistor product line, engineered for cost-sensitive, reliability-critical linear and switching applications in industrial and consumer electronics.

FAQ

What is the maximum collector-emitter voltage rating for 2N3702_D27Z?

The 2N3702_D27Z has a maximum collector-emitter voltage (V_CEO) rating of −25 V at T_A = 25°C. This value is confirmed under open-base conditions with I_C = −10 mA. Exceeding this voltage risks irreversible junction breakdown. Derating is required at elevated temperatures per the device's thermal characteristics table in the original Fairchild datasheet Rev. B (July 2002).

Is 2N3702_D27Z suitable for switching applications?

Yes, 2N3702_D27Z is explicitly rated for switching use, with V_CE(sat) ≤ −0.25 V at I_C = −50 mA and I_B = −5.0 mA. Its −500 mA continuous collector current and low saturation voltage enable efficient on-state operation in discrete logic drivers and relay interfaces. Switching speed is limited by f_T = 100 MHz and stored charge, making it appropriate for ≤100 kHz duty-cycle applications.

What is the pin configuration of 2N3702_D27Z in the TO-92 package?

The 2N3702_D27Z uses the standard TO-92 pinout: Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base-viewed from the flat side of the package with leads pointing downward. This configuration matches JEDEC TO-92 outline and is mechanically and electrically identical to other Fairchild PNP transistors in the same family, including the 2N3704 NPN complement.

Does 2N3702_D27Z have a specified transition frequency (f_T)?

Yes, the 2N3702_D27Z has a specified transition frequency (f_T) of 100 MHz, measured at I_E = −50 mA and V_CE = −5.0 V. This parameter confirms usable small-signal gain up to audio frequencies and validates its suitability for broadband amplification stages where phase margin and bandwidth predictability are critical.

What is the thermal resistance from junction to ambient (R_θJA) for 2N3702_D27Z?

The thermal resistance from junction to ambient (R_θJA) for 2N3702_D27Z is 200°C/W under standard FR-4 PCB mounting conditions with no copper pour. This value assumes natural convection and defines the temperature rise per milliwatt of dissipated power. At its rated 625 mW maximum power, junction temperature will rise 125°C above ambient-requiring ambient limits ≤25°C for safe operation at full rating.