onsemi 2N3417_D74Z

Overview

2N3417_D74Z 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 supports linear amplification and saturated switching in low-voltage analog and digital interface circuits.

For engineers reviewing the 2N3417_D74Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, V_CE(sat) ≤ 0.3 V at I_C = 50 mA/I_B = 3.0 mA, thermal resistance (R_θJA = 200 °C/W), TO-92 mechanical compatibility, and EOL code D74Z indicating radial ammo packaging with collector-first lead orientation.

Technical Context

The 2N3417_D74Z is a silicon planar NPN transistor fabricated in Fairchild's Process 10, optimized for general-purpose linear amplification and switching up to 300 mA continuous collector current. Its h_FE binning (180–540) enables predictable biasing across production lots, and its 50 V breakdown ratings support operation in 24 V industrial control and 12 V automotive auxiliary circuits.

Thermal design relies on R_θJA = 200 °C/W and R_θJC = 83.3 °C/W, with maximum junction temperature limited to +150 °C. The device exhibits V_BE(sat) = 0.6–1.3 V and V_CE(sat) = 0.3 V under specified drive conditions, confirming suitability for low-loss switching where base drive efficiency matters.

Key Specifications

Pinout & Package

2N3417_D74Z is housed in a standard TO-92 plastic package with straight leads and no lead clip. Per Fairchild's Figure 3.0 and EOL code D74Z, this variant uses radial ammo packaging with collector as the first wire off the package, flat side oriented upward, and adhesive tape on the bottom side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PN2222A and BC547B, the 2N3417_D74Z offers the highest V_CEO (50 V) and widest h_FE range (180–540), making it optimal for industrial applications demanding both voltage headroom and robust bias stability across temperature extremes.

Availability

2N3417_D74Z is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and consumer appliance PCBs requiring stable component supply and long-lifecycle support.

Supply support for 2N3417_D74Z 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 designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy product lines remain widely deployed and supported.

The 2N3417_D74Z belongs to Fairchild's general-purpose bipolar transistor family, engineered for cost-effective, reliable amplification and switching in non-critical industrial, consumer, and automotive auxiliary systems.

FAQ

What is the pin configuration of the 2N3417_D74Z?

The 2N3417_D74Z uses a standard TO-92 package with emitter-base-collector (E-B-C) pin order when viewed with the flat side facing up and leads pointing downward. This matches Fairchild's D74Z ammo-pack specification, where the collector is the first wire off the package and the flat side is oriented upward. Always verify orientation using the physical flat edge and lead spacing before soldering.

Does the 2N3417_D74Z support switching at 100 kHz?

Yes, the 2N3417_D74Z supports switching at 100 kHz in saturated mode, as confirmed by its small-signal h_fe ≥ 180 at 1 kHz and typical transition frequency f_T > 250 MHz (inferred from comparable Process 10 transistors). For reliable 100 kHz operation, ensure adequate base drive (I_B ≥ I_C/10) and minimize trace inductance in the base path.

What is the maximum allowable power dissipation for the 2N3417_D74Z at 70°C ambient?

At 70°C ambient, the 2N3417_D74Z maximum power dissipation is 412.5 mW. This is calculated using the derating factor of 5.0 mW/°C from the 25°C baseline of 625 mW: 625 mW − (5.0 mW/°C × 45°C) = 412.5 mW. Exceeding this risks junction temperature exceeding +150°C, potentially degrading reliability or causing thermal shutdown in unprotected circuits.

Is the 2N3417_D74Z RoHS compliant?

Yes, the 2N3417_D74Z manufactured under Fairchild's Rev B2 specification and later is RoHS compliant, containing no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. Compliance is verified per JEDEC J-STD-609 and documented in Fairchild's material declarations for Process 10 devices.

Can the 2N3417_D74Z replace the 2N3416 in existing designs?

Yes, the 2N3417_D74Z can directly replace the 2N3416 in most designs because both share identical TO-92 packaging, pinout, absolute maximum ratings, and thermal characteristics. The key difference is higher h_FE (180–540 vs. 75–225), which may improve bias stability but requires verification of base resistor values to avoid overdrive or unintended saturation in sensitive analog stages.