onsemi 2N5210NMBU

Overview

2N5210NMBU from Fairchild Semiconductor is an NPN general-purpose amplifier transistor optimized for low-noise, high-gain signal amplification at collector currents from 1 µA to 50 mA. It features V_CEO = 50 V, h_FE = 250–600 (at I_C = 1–10 mA), f_T = 30 MHz, NF = 2.0–3.0 dB, and C_cb = 4.0 pF - enabling use in audio preamplifiers, sensor interface stages, and low-level analog signal conditioning.

For engineers reviewing the 2N5210NMBU datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23 package, TO-92-compatible electrical behavior, low-noise performance below 15.7 kHz, stable h_FE across temperature, and suitability for battery-powered analog front-ends requiring <100 mA continuous collector current.

Technical Context

The 2N5210NMBU operates as a silicon NPN bipolar junction transistor with common-emitter configuration. Its design emphasizes low-noise amplification at microamp-to-milliamperes bias levels, supported by specified noise figure (2.0 dB at 10 kHz, R_S = 10 kΩ) and high small-signal current gain (h_fe = 250–900 at 1 kHz).

Thermal performance is defined by R_θJA = 357 °C/W (SOT-23) and T_J range of –55°C to +150°C. Absolute maximum ratings include V_CEO = 50 V, I_C = 100 mA, and P_D = 350 mW at 25°C - derated linearly above ambient.

Key Specifications

Pinout & Package

2N5210NMBU is packaged in SOT-23 (TO-236AB), marked "3M", with lead-free finish and RoHS compliance. Pin assignment follows standard CBE (Collector–Base–Emitter) order.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT5210 and 2N5210, the 2N5210NMBU shares identical electrical characteristics but is specifically designated for surface-mount assembly with tighter process controls - making it optimal for automated high-volume production while retaining full functional equivalence.

Availability

2N5210NMBU is available at Aetrix Electronics and suitable for audio preamplifiers, electret microphone interfaces, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 2N5210NMBU 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 2N5210NMBU belongs to Fairchild's legacy NPN general-purpose amplifier family, designed for low-noise, high-gain analog signal amplification in cost-sensitive industrial and consumer electronics.

FAQ

What is the maximum continuous collector current rating for the 2N5210NMBU?

The 2N5210NMBU has a maximum continuous collector current (I_C) rating of 100 mA at T_A = 25°C. This limit decreases with rising ambient temperature due to thermal derating - at 70°C ambient, usable I_C drops to approximately 70 mA. The device is typically operated at ≤50 mA for reliable long-term performance in SOT-23 packages. Always verify junction temperature using R_θJA = 357 °C/W when designing thermal margins for the 2N5210NMBU.

Does the 2N5210NMBU support low-noise operation at audio frequencies?

Yes, the 2N5210NMBU delivers low-noise performance optimized for audio-band applications: NF = 2.0 dB at 10 kHz with R_S = 10 kΩ and bandwidth = 15.7 kHz, and NF = 3.0 dB at 1 kHz with R_S = 22 kΩ. These values are measured under standardized conditions per the Fairchild datasheet, confirming its suitability for electret microphone preamplifiers and line-level audio buffering where SNR >60 dB is required. The 2N5210NMBU achieves this via low base spreading resistance and controlled doping profiles.

What is the pin configuration and marking for the 2N5210NMBU?

The 2N5210NMBU uses the SOT-23 package with standard CBE pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. The top-side marking is "3M", consistent with Fairchild's SOT-23 NPN amplifier series. This marking is laser-etched and verified per JEDEC standards. No orientation dot or polarity indicator is present - mechanical orientation follows the flat edge on the package body. Always confirm pinout with multimeter diode test before populating the 2N5210NMBU in production.

How does the 2N5210NMBU compare to the TO-92 version 2N5210?

The 2N5210NMBU and 2N5210 share identical silicon die and electrical specifications including V_CEO, h_FE, f_T, and NF. Their differences are purely mechanical: 2N5210NMBU is SOT-23 (surface-mount), while 2N5210 is TO-92 (through-hole). Thermal resistance differs significantly - R_θJA = 357 °C/W (SOT-23) vs. 200 °C/W (TO-92) - meaning the 2N5210NMBU requires careful PCB copper area design for thermal management. Both are valid for the same circuit functions, but the 2N5210NMBU is intended for automated assembly.

Is the 2N5210NMBU suitable for use in automotive applications?

The 2N5210NMBU is not AEC-Q101 qualified, but its specified operating junction temperature range of –55°C to +150°C and robust absolute maximum ratings (e.g., V_CEO = 50 V, T_J = 150°C) support use in non-safety-critical automotive subsystems such as cabin ambient light sensing, HVAC sensor interfaces, or infotainment auxiliary amplifiers - provided system-level qualification and board-level thermal validation are performed. For ASIL-B/C systems, a qualified alternative should be selected. The 2N5210NMBU remains widely deployed in Tier-2 automotive electronics where full qualification is not mandated.