onsemi 2N5087_J61Z

Overview

2N5087_J61Z from ON Semiconductor (formerly Fairchild) is a PNP silicon epitaxial planar transistor designed for low-level, high-gain, low-noise general-purpose amplifier applications up to 50 mA collector current. It features a DC current gain (h_FE) of 250 at −1.0 mA I_C, V_CE = −5.0 V; V_CEO = −50 V; f_T = 40 MHz; and noise figure of 2.0 dB at I_C = −20 µA, R_S = 10 kΩ, 10 Hz–15.7 kHz bandwidth - optimized for audio preamplifier and sensor signal conditioning stages.

For engineers reviewing the 2N5087_J61Z datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, TO-92 package mechanical compatibility, −50 V breakdown rating, 250 minimum h_FE at low bias, and sub-2 dB noise performance in high-impedance source configurations.

Technical Context

This device operates as a linear PNP bipolar junction transistor with fixed-emitter common configuration. Its design emphasizes low-noise amplification at collector currents from 10 µA to 50 mA, supported by a 40 MHz f_T, 4.0 pF C_cb, and tightly specified h_FE range (250–800) across bias conditions. Junction temperature is rated to +150°C with thermal resistance R_θJA = 357°C/W on FR-4 PCB.

The 2N5087_J61Z shares electrical specifications and package footprint with the 2N5086 and MMBT5087 variants but is distinguished by its guaranteed minimum h_FE of 250 at −1.0 mA I_C, making it suitable for precision analog gain stages where consistent current amplification is required without active bias compensation.

Key Specifications

Pinout & Package

2N5087_J61Z is housed in a TO-92 plastic package (JEDEC TO-226AA), with leads arranged in straight-line configuration and standard lead-forming for through-hole PCB assembly. The package provides mechanical robustness and thermal dissipation suitable for industrial and consumer-grade analog circuits.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT5087 and 2N5086, the 2N5087_J61Z offers the highest guaranteed h_FE in the TO-92 form factor, enabling simpler bias networks and improved repeatability in analog signal chains where gain stability is critical.

Availability

2N5087_J61Z is available at Aetrix Electronics and suitable for audio preamplifier design, industrial sensor signal conditioning, and legacy telecom line interface applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 2N5087_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

ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and consumer markets.

The 2N5087_J61Z belongs to Fairchild's legacy "FACT Quiet Series™" discrete transistor family, engineered specifically for low-noise, high-gain analog signal amplification in cost-sensitive, high-reliability applications.

FAQ

What is the maximum collector-emitter voltage rating for 2N5087_J61Z?

The 2N5087_J61Z has a maximum collector-emitter voltage (V_CEO) rating of −50 V. This specification is verified under test condition I_C = −1.0 mA, I_B = 0 at T_A = 25°C. Exceeding this voltage risks irreversible breakdown; design margins should maintain ≤80% of this rating in continuous operation. The 2N5087_J61Z shares this rating with the 2N5086 and MMBT5087 variants.

Does 2N5087_J61Z have a guaranteed minimum DC current gain (h_FE)?

Yes, the 2N5087_J61Z guarantees a minimum h_FE of 250 at I_C = −1.0 mA and V_CE = −5.0 V, per the official Fairchild/ON Semiconductor datasheet Rev. B1. This is higher than the 2N5086's 150 minimum, making the 2N5087_J61Z preferable for gain-critical analog stages where bias stability matters.

What is the noise figure of 2N5087_J61Z and under what conditions is it measured?

The 2N5087_J61Z achieves a noise figure (NF) of 2.0 dB when tested at I_C = −20 µA, V_CE = −5.0 V, R_S = 10 kΩ, and bandwidth 10 Hz to 15.7 kHz. This value is confirmed in the "Electrical Characteristics" table and validated in Figure 8 of the datasheet. It reflects true low-noise capability for high-impedance sensor interfaces.

Which package type does 2N5087_J61Z use, and how are its pins arranged?

The 2N5087_J61Z uses the TO-92 (JEDEC TO-226AA) through-hole package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector - as shown in the "Package Dimensions" section and marked "2Q" on the device body. This arrangement is standardized across Fairchild's 2N5086/2N5087 family and compatible with legacy socket footprints.

Can 2N5087_J61Z be used as a direct replacement for 2N5086 in existing designs?

The 2N5087_J61Z is mechanically and electrically pin-compatible with the 2N5086 in the TO-92 package, sharing identical pinout, voltage ratings, and thermal characteristics. However, its higher guaranteed h_FE (250 vs. 150) may shift DC bias points; verify quiescent operating points and AC gain in the 2N5087_J61Z implementation before full deployment.