onsemi MMBT3906_NL

Overview

MMBT3906_NL from onsemi is a PNP bipolar junction transistor (BJT) designed for general-purpose amplification and low-power switching in discrete analog and digital circuits, with V_CEO = −40 V, I_C = −200 mA, h_FE = 100–300 at I_C = −10 mA, V_CE(sat) = −0.25 V at I_C/I_B = −10 mA/−1 mA, and packaged in SOT-23. It serves in bias networks, level shifters, and load switches in industrial control and consumer power management.

For engineers reviewing the MMBT3906_NL datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, switching timing data, SOT-23 terminal mapping, and validated alternative transistors - all specific to the MMBT3906_NL variant per onsemi's PZT3906/D Rev. 2 documentation.

Technical Context

The MMBT3906_NL operates as a silicon PNP BJT with epitaxial base construction, optimized for linear amplification and saturated switching across −55°C to +150°C ambient range. Its h_FE varies from 60 at I_C = −0.1 mA to 30 at I_C = −100 mA, and f_T = 250 MHz enables stable gain up to audio and low-RF frequencies.

Thermal performance is defined by R_θJA = 357°C/W on FR-4 PCB (2.4 mm × 2.9 mm pad), limiting continuous power dissipation to 350 mW at 25°C with 2.8 mW/°C derating. Switching behavior includes t_d = 35 ns, t_r = 35 ns, t_s = 225 ns, and t_f = 75 ns under specified V_CC = −3.0 V, I_C = −10 mA conditions.

Key Specifications

Pinout & Package

SOT-23 3-lead plastic package (JEDEC TO-236AB), surface-mountable with gull-wing leads, footprint compatible with automated assembly. Thermal pad not present; case is electrically isolated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC807-25,115 and PN2907A, the MMBT3906_NL offers optimal balance of SOT-23 footprint compatibility, −40 V rating, and verified 100–300 h_FE range at 10 mA - making it preferred for space-constrained, low-to-moderate current amplification and switching where thermal resistance of 357°C/W is acceptable.

Availability

MMBT3906_NL is available at Aetrix Electronics and suitable for LED driver circuits, level shifter interfaces, current mirror references, and power supply sequencing requiring stable component supply and consistent parametric performance across production batches.

Supply support for MMBT3906_NL 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMBT3906_NL belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-volume applications demanding reliable DC amplification and switching with standardized SOT-23 packaging.

FAQ

What is the maximum collector-emitter voltage rating for the MMBT3906_NL?

The MMBT3906_NL has a V_CEO rating of −40 V, meaning it can safely block up to 40 V in reverse polarity between collector and emitter with base open. This rating is confirmed in the Absolute Maximum Ratings table of onsemi's PZT3906/D Rev. 2 datasheet and applies strictly to the MMBT3906_NL in SOT-23 package under steady-state DC conditions.

Does the MMBT3906_NL support switching at frequencies above 1 MHz?

Yes - the MMBT3906_NL achieves f_T = 250 MHz and exhibits t_d + t_r = 70 ns, enabling clean switching up to ~5 MHz in non-saturated or lightly saturated configurations. However, full saturation increases t_s to 225 ns, limiting practical PWM use to ≤1 MHz unless unsaturated operation is employed. This behavior is documented in the Switching Characteristics section of the MMBT3906_NL datasheet.

What is the typical DC current gain (h_FE) of the MMBT3906_NL at 10 mA collector current?

The MMBT3906_NL delivers h_FE = 100–300 at I_C = −10 mA and V_CE = −1.0 V, as specified in the Electrical Characteristics table. This range reflects production lot variation and ensures sufficient gain for base resistor design in both amplifier and switch modes without requiring trimming. The value is measured per JEDEC JESD22-A108 standard and applies specifically to the MMBT3906_NL variant.

Can the MMBT3906_NL be used in a current mirror configuration?

Yes - the MMBT3906_NL is routinely used in discrete PNP current mirrors due to its tight h_FE distribution, low V_BE(sat) variation (−0.65 to −0.85 V), and thermal tracking in matched SOT-23 layouts. Its −55°C to +150°C operating range ensures stable mirroring across industrial temperature extremes, as validated in onsemi's application notes for bias network design using the MMBT3906_NL.

What is the thermal resistance (R_θJA) of the MMBT3906_NL on a standard FR-4 PCB?

The MMBT3906_NL has R_θJA = 357°C/W when mounted on a standard FR-4 PCB with 2.4 mm × 2.9 mm copper pad per the JEDEC test condition in the Thermal Characteristics table. This value directly determines power derating: at 75°C ambient, max allowable P_D drops to ~175 mW. The measurement method and board layout are explicitly defined for the MMBT3906_NL in onsemi's PZT3906/D Rev. 2 datasheet.