onsemi 2N3417_D27Z

Overview

2N3417_D27Z from Fairchild Semiconductor is an NPN general-purpose amplifier and switch in TO-92 package, rated for 50 V V_CEO, 500 mA I_C, and 625 mW P_D, with h_FE of 180–540 at I_C = 2.0 mA. It serves in low-voltage analog amplification and digital switching circuits up to 300 mA load current.

For engineers reviewing the 2N3417_D27Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, saturation voltage under defined drive conditions, thermal resistance (R_θJA = 200 °C/W), and TO-92 mechanical compatibility in space-constrained PCB layouts.

Technical Context

The 2N3417_D27Z operates as a silicon NPN bipolar junction transistor fabricated using Fairchild's Process 10. Its design supports linear amplification (h_fe = 180 at 1 kHz) and saturated switching (V_CE(sat) ≤ 0.3 V at I_C = 50 mA, I_B = 3.0 mA).

It features symmetrical breakdown ratings: V_(BR)CEO = V_(BR)CBO = 50 V, V_(BR)EBO = 5.0 V, and low leakage (I_CBO ≤ 100 nA at V_CB = 25 V), enabling reliable operation in bias-stable amplifier stages and logic-level interface circuits.

Key Specifications

Pinout & Package

2N3417_D27Z is supplied in TO-92 plastic package with straight leads and no lead clip (EOL code D27Z). Pin orientation follows standard TO-92 configuration: flat side facing viewer, leads down, left-to-right = Emitter–Base–Collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2N3417_D27Z, the 2N2222A offers broader legacy availability but reduced DC gain consistency, while the BC547B delivers tighter h_FE tolerance at lower voltage ratings-making each suitable for distinct trade-offs in gain, voltage margin, and sourcing reliability.

Availability

2N3417_D27Z is available at Aetrix Electronics and suitable for audio pre-amplifiers, microcontroller GPIO drivers, DC power supply pass transistors, and discrete logic level shifters requiring stable component supply and TO-92 mechanical compatibility.

Supply support for 2N3417_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 2N3417_D27Z belongs to Fairchild's legacy general-purpose NPN transistor product line, designed for cost-sensitive, medium-current amplification and switching in consumer, industrial, and educational electronics.

FAQ

What is the maximum continuous collector current for the 2N3417_D27Z?

The 2N3417_D27Z has a maximum continuous collector current (I_C) rating of 500 mA at T_A = 25°C. However, the datasheet specifies functional use up to 300 mA for amplifier and switching applications. Derating is required above 25°C ambient, and pulsed operation must be evaluated separately per manufacturer guidance. The 2N3417_D27Z should not be operated beyond its absolute maximum ratings to ensure long-term reliability.

Is the 2N3417_D27Z pin-compatible with other TO-92 NPN transistors like the 2N2222?

Yes, the 2N3417_D27Z uses the standard TO-92 package with E-B-C pinout (flat side facing viewer, leads down, left-to-right). This matches the mechanical and electrical pin assignment of the 2N2222, PN2222, and BC547 series. However, differences in h_FE, V_CE(sat), and breakdown voltages mean circuit validation is required before substitution. The 2N3417_D27Z remains functionally interchangeable only where its specific gain and voltage specs meet design requirements.

What does the suffix '_D27Z' indicate for the 2N3417_D27Z?

The '_D27Z' suffix identifies the packaging configuration: tape-and-reel format using machine option 'E', with emitter-first orientation, adhesive tape on top side, and flat side of the TO-92 package positioned downward. It corresponds to 2,000 units per reel and is part of Fairchild's standardized EOL coding system for automated assembly. The 2N3417_D27Z designation ensures traceability to this specific taping specification-not a device variant or performance grade.

Can the 2N3417_D27Z be used in linear amplifier applications?

Yes, the 2N3417_D27Z is explicitly characterized for linear amplification, with h_fe = 180 at I_C = 2.0 mA, V_CE = 4.5 V, and f = 1.0 kHz. Its low distortion and stable gain across temperature make it suitable for pre-amplifier stages, sensor signal conditioning, and low-frequency active filters. Bias networks must maintain V_CE > 1 V and avoid saturation to preserve linearity. The 2N3417_D27Z performs reliably in Class-A configurations within its thermal limits.

What is the thermal resistance junction-to-ambient (R_θJA) for the 2N3417_D27Z?

The 2N3417_D27Z has a specified R_θJA of 200 °C/W under standard test conditions (free-air, no heatsink). This value assumes the device is mounted on a typical FR-4 PCB with minimal copper area. In practice, adding thermal relief pads or copper pour can reduce effective R_θJA by 20–40%. For continuous operation near 625 mW, board layout and ambient temperature must be carefully managed to keep junction temperature below 150°C. The 2N3417_D27Z thermal performance is consistent with industry-standard TO-92 discrete transistors.