Transistores
Produtos (96)
BC817-40 - 45V 500mA NPN Transistor SOT-23 | Nexperia
The Nexperia BC817-40 is an NPN general-purpose bipolar junction transistor (BJT) rated at 45 V VCEO, 500 mA continuous collector current, and 310 mW power dissipation, housed in a SOT-23 (TO-236AB) surface-mount plastic package. The -40 suffix denotes the highest DC current-gain (hFE) bin of the BC817 family, delivering a minimum hFE of 250 at 100 mA/1 V, which makes it the preferred choice for low-saturation switching and high-gain driver stages. An NPN BJT is a three-terminal semiconductor device in which a small base current controls a much larger collector current; it belongs to the bipolar transistor family within discrete semiconductors. The BC817 series occupies the medium-power small-signal segment - more current than a BC847 (100 mA) yet in the same miniature SOT-23 footprint, sitting between signal-level transistors and dedicated switching MOSFETs. Key features include a transition frequency (fT) of 100 MHz, VCEO of 45 V, VCBO of 50 V, VEBO of 5 V, and a low collector-emitter saturation voltage typically below 700 mV at 500 mA. The complementary PNP counterpart is the BC807-40, which uses an identical pinout with reversed polarity, enabling paired push-pull output stages in audio and DC-DC converter circuits. The device is built using an epitaxial planar die process in a SOT-23 (TO-236AB) package, the industry-standard 3-pin surface-mount outline measuring approximately 2.9 mm x 1.3 mm with a JEDEC TO-236 registration. The plastic encapsulation carries an MSL-1 moisture sensitivity rating, allowing direct reflow without prior bake-out. Typical applications include switching circuits, AF driver stages, generic interface level-shifters, MOSFET gate drivers, relay/solenoid drivers, and DC-DC converter synchronised rectifiers. The -40 hFE bin is especially useful where high gain is needed without cascading a second transistor. When designing with the BC817-40, place a base series resistor to limit base current during turn-off transients, and respect the 310 mW power dissipation limit at 25 C by derating approximately 2.5 mW per degree Celsius above that point. This page consolidates distributor pricing, pin-compatible drop-in alternatives, and application guidance not found in the standalone datasheet.
BC817-40,215 - 45V 500mA NPN BJT SOT-23 | Nexperia
The Nexperia BC817-40,215 is a 45V VCEO, 500mA NPN bipolar junction transistor in a SOT-23 (TO-236AB) surface-mount package with a 100MHz transition frequency and 250mW power dissipation. The "-40" suffix denotes a DC current gain (hFE) bin of 250 to 600 at IC=100mA, VCE=1V, making it the highest-gain variant in the BC817 family (the BC817 base, -25, and -16 cover hFE bins of 110-250, 160-400, and 100-250 respectively). A NPN BJT (bipolar junction transistor) is a three-terminal semiconductor device in which a small base current controls a much larger collector current, providing either signal amplification or saturated switching. BJTs sit within the broader category of discrete semiconductors, beneath transistors and ultimately the semiconductor taxonomy. The BC817 series occupies the general-purpose switching/amplification tier, optimized for low-voltage (<=45V) digital logic interfaces, driver stages, and analog small-signal paths. Its PNP complement in the Nexperia portfolio is the BC807-40 in the same SOT-23 footprint, allowing complementary push-pull designs on a shared PCB land pattern. Key features include a 45V collector-emitter breakdown voltage (VCEO), 50V collector-base voltage (VCBO), 500mA continuous collector current (IC), 100MHz transition frequency (fT) at 10V/10mA, and a 250mW total power dissipation rating on a 25C reference footprint. The device is qualified to the JEDEC TO-236AB outline (JEDEC register), is fully RoHS compliant, and supports lead-free reflow profiles up to 260C peak per JEDEC J-STD-020. The SOT-23 package uses a standard JEDEC pinout (pin 1 base, pin 2 emitter, pin 3 collector) shared with thousands of industry SOT-23 transistors, which is critical for drop-in replacement flexibility. Typical applications include MOSFET gate drivers for P-channel power switches, load-switch interface logic level translation between microcontrollers and 12V peripheral rails, general-purpose low-frequency amplification in consumer audio pre-stages, and DC-DC converter control-loop auxiliary switches. The 500mA collector current rating makes it suitable for relay coil drivers, solenoid pre-drivers, and small DC fan interfaces up to 200mA continuous. When designing with this part, observe the 250mW power dissipation budget when calculating collector load power: PD = VCE(sat) * IC. Use a base resistor sized to deliver at least IC/10 base current for hard saturation (VCE(sat) <= 200mV typical), and route the emitter pin directly to a low-impedance ground plane for stable high-gain DC operation. This page synthesizes distributor stock, drop-in alternatives drawn from cross-reference databases, and engineering notes not aggregated on any single manufacturer or distributor product page.
BC817-40-RF - 45V 0.5A NPN BJT SOT-23 | Taiwan Semiconductor
The Taiwan Semiconductor BC817-40-RF is an NPN bipolar junction transistor (BJT) rated at 45 V VCEO and 0.5 A continuous collector current, housed in a compact 3-pin SOT-23 surface-mount package. It is part of the industry-standard BC817 family and is the -40 gain bin (hFE 250 to 600), making it the highest-gain selection of the BC817/BC816/BC815 series. The BC817-40-RF is qualified as an RoHS-compliant, lead-free part and is widely used as a general-purpose small-signal amplifier and medium-power switch. A bipolar junction transistor (BJT) is a three-terminal semiconductor device consisting of two PN junctions (emitter-base and base-collector) sandwiched in either NPN or PNP polarity. Within the transistor taxonomy, the BC817-40-RF sits in the small-signal BJT category -> general-purpose transistor -> discrete semiconductor. The BJT operates in three regions - active (amplification), saturation (switch on), and cutoff (switch off) - with the base current controlling the much larger collector current through the hFE (DC current gain) ratio. SOT-23 plastic packages enable low-cost, high-volume surface-mount assembly for consumer, industrial, and automotive subsystems. Key features include a transition frequency (fT) of approximately 100 MHz, a maximum power dissipation of 310 mW, and a continuous collector current rating of 0.5 A (with pulsed capability up to higher levels in some datasheet curves). The device supports both linear amplification and saturated switching topologies and is the NPN complement to the BC807 PNP family. Pin-compatible drop-in alternatives are widely available from multiple manufacturers, simplifying second-sourcing. Typical applications include LED drivers, relay drivers, signal-level shifters, general-purpose amplifier stages, load switches, DC-DC converter pass elements, and interface buffers between logic and higher-current loads. The high hFE bin (250-600) makes the BC817-40-RF especially suited to high-impedance driver interfaces such as microcontroller GPIO ports driving MOSFET gates or opto-isolator inputs. When designing with this device, ensure that base drive current is sized for worst-case hFE (250) to guarantee saturation at the minimum specified hFE. Place a base-series resistor to limit base current under fault conditions, and observe 310 mW power dissipation limits in still air without a copper heatsink. This page synthesizes distributor pricing, multi-vendor drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, giving the engineer a single decision-ready reference.
BC817-40-SNR - 45V 500mA NPN Transistor SOT-23 | Nexperia
The Nexperia BC817-40-SNR is a 45 V, 500 mA NPN general-purpose bipolar junction transistor (BJT) in a SOT-23 (TO-236AB) surface-mount package. It features a 100 MHz transition frequency and 250 mW power dissipation, with the "-40" suffix denoting a DC current gain (hFE) bin of 250 to 630 at 2 V VCE and 100 mA IC. The "/SNR" suffix indicates the SOT-23 package with tape-and-reel packaging, 3000 pieces per reel. An NPN bipolar transistor is a three-terminal semiconductor device in which a small base current controls a much larger collector current. The BC817 series belongs to the BJT hierarchy: bipolar transistor -> small-signal transistor -> general-purpose amplifier/switch -> discrete semiconductor. NPN transistors are the most common BJT polarity, used for low-side switching, signal amplification, and driver stages where the emitter is grounded and the load is tied to the positive supply. Key specifications include a collector-emitter breakdown voltage (VCEO) of 45 V, collector current (IC) of 500 mA continuous, total power dissipation (Ptot) of 250 mW, and a transition frequency (fT) of 100 MHz. The DC current gain is binned: BC817-16 (110-250 hFE), BC817-25 (175-400 hFE), and BC817-40 (250-630 hFE). The PNP complement is BC807-50 (same hFE bin convention). Architecturally, the BC817-40 uses an epitaxial planar NPN die in a plastic SOT-23 housing with three gull-wing leads (Base, Collector, Emitter). The exposed tab on the package body serves as a thermal pad and is connected to the collector. The high fT of 100 MHz supports RF and high-speed switching applications, while the 45 V VCEO rating permits direct interfacing to 24 V industrial buses and 12 V automotive rails without additional protection. Typical applications include low-side switching for relays, LEDs, and solenoids; general-purpose amplification in audio and instrumentation circuits; load drivers for MOSFET gate drivers; oscillator and timer circuits; and interface circuits between logic levels and higher-voltage loads. The BC817-40 is widely used in consumer electronics, industrial controls, and automotive subsystems. When designing with this device, observe the 250 mW power dissipation limit at 25 C ambient. For switching inductive loads such as relays or solenoids, place a flyback diode across the load to clamp the back-EMF and protect the transistor. Ensure base current is properly limited via a series resistor to avoid driving the transistor into saturation excessively. This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes drawn from the Nexperia BC817-40 datasheet, going beyond what any single distributor listing provides.
BC847BW-7-F - NPN BJT 45V 100mA SOT-323 | Diodes Incorporated
The Diodes Incorporated BC847BW-7-F is an NPN small-signal bipolar junction transistor (BJT) rated for 45 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 200 mW power dissipation, housed in a compact 3-pin SOT-323 (SC-70) surface-mount package. According to the manufacturer datasheet, it offers a DC current gain (hFE) of at least 200 at 2 mA collector current and a transition frequency of 300 MHz, making it suited for switching and audio-frequency (AF) amplifier applications. A bipolar junction transistor is a three-terminal semiconductor device that uses both electron and hole charge carriers to amplify or switch electronic signals. BJTs sit at the foundation of the discrete semiconductor hierarchy: transistor -> small-signal BJT -> general-purpose amplifier and switch. The BC847BW belongs to the widely standardized BC847 family, whose pinout and gain groupings (A, B, C grades) are recognized across the entire industry, so designs built around it remain manufacturable for decades. Key features include automatic-insertion-friendly lead forming, availability of complementary PNP types in the BC856W to BC858W family, lead-free and RoHS-compliant construction with a Green package designation, and the space-saving SOT-323 footprint that occupies roughly half the board area of a SOT-23. The 300 MHz transition frequency gives ample margin for fast logic-level switching and RF-biased analog stages. Technically, the device uses a planar epitaxial silicon NPN structure. The B gain grade guarantees hFE between 200 and 450 at 2 mA, providing predictable bias behavior in low-current analog stages. The 45 V VCEO rating comfortably covers 24 V industrial rails, 12 V automotive systems, and 5 V or 3.3 V logic domains, while a low collector-emitter saturation voltage supports efficient low-side switching. Typical applications include general-purpose low-side switching of relays, LEDs, and microcontroller I/O; AF amplifier input and driver stages; and level-shifting or buffer stages in sensor and communication interfaces. Its high gain grade at low collector currents makes it especially economical in battery-powered portable electronics. For design, remember that 200 mW dissipation in the SOT-323 package is only achievable with adequate PCB copper area; derate above 25 C ambient. Keep base drive current within the datasheet limit and verify hFE grouping when replacing other BC847 grades. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, with verified data as of 2026-10-13.
BCY79-VII - PNP 45V 100mA Low Noise TO-18 | Central Semiconductor
The Central Semiconductor BCY79-VII is a silicon PNP epitaxial planar bipolar junction transistor (BJT) rated at 45V collector-base voltage, 100mA maximum collector current, and 340mW power dissipation, housed in a hermetically sealed TO-18 metal can package with 100MHz transition frequency for low-noise amplifier and switching applications. A bipolar junction transistor is a three-terminal current-controlled semiconductor device that amplifies or switches electronic signals. Within the component hierarchy, the BCY79-VII belongs to the small-signal BJT family: transistor -> bipolar junction transistor -> PNP general-purpose transistor -> discrete semiconductor. PNP devices conduct when the base is pulled low relative to the emitter, making them the complementary counterparts to NPN types in push-pull stages and differential pairs. Key features include a low-noise figure suited to audio input stages, the hermetic TO-18 metal case that provides superior shielding and thermal stability versus plastic packages, and the -VII gain group selection (part of the BCY79 VII/VIII/IX/X hFE binning scheme) that guarantees predictable DC current gain for precision analog design. The 5V emitter-base rating and 200C maximum junction capability (per the Central Semiconductor family datasheet) support demanding legacy designs. The epitaxial planar process delivers a 100MHz transition frequency, adequate for RF amplification up to VHF and fast small-signal switching. Because the die is sealed in metal, leakage currents remain low across temperature, benefiting high-impedance input stages in instrumentation. Typical applications include low-noise audio preamplifier input stages, driver stages in analog signal chains, switching circuits in industrial legacy equipment, and RF/VHF small-signal amplification. Philips (now NXP) originally manufactured the BCY79 family; Central Semiconductor continues production for the aftermarket. Design consideration: respect the 340mW package dissipation at 25C free air and derate above ambient; verify pin orientation (TO-18 pinout) before drop-in replacement because TO-18 lead arrangements vary across families. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, with per-day verification against live web data.
BCY79-VII PBFREE - PNP 45V 100mA TO-18 BJT | Central Semiconductor
The Central Semiconductor BCY79-VII PBFREE is a PNP silicon epitaxial planar bipolar junction transistor (BJT) rated for 45 V collector-base voltage (VCBO), 100 mA collector current, and 100 MHz transition frequency, delivered in a hermetically sealed TO-18 metal through-hole package with a 1 W package power rating and 340 mW free-air dissipation. The PBFREE suffix confirms lead-free and lead-free-solder-compatible construction for RoHS-aligned assemblies. A bipolar junction transistor is a three-terminal current-controlled semiconductor device that amplifies or switches electronic signals. Within the power and signal-chain hierarchy, the BJT sits under the discrete semiconductor family, alongside MOSFETs and IGBTs. The BCY79-VII is a small-signal PNP general purpose transistor intended for low-noise amplifier and medium-speed switching stages, complementing its NPN counterpart families in discrete front-end designs. Key features include a 45 VCBO collector-base rating, a 5.0 VEBO emitter-base rating for input-stage robustness, a 100 MHz transition frequency supporting audio through RF-front-end switching roles, and a hermetically sealed TO-18 metal can that provides superior moisture immunity and thermal stability compared with plastic packages, making it attractive for harsh-environment and instrumentation designs. Technically, the BCY79-VII uses an epitaxial planar silicon process. The metal TO-18 case (JEDEC TO-18 outline) acts as an electrostatic and electromagnetic shield, reducing stray noise pickup in low-noise input stages. The VII suffix designates a specific DC current gain (hFE) grouping within the BCY79 family; gain-grouped parts let designers lock gain windows across production lots, improving repeatability of bias points in discrete amplifier designs. Typical applications include low-noise preamplifier input stages, analog instrumentation front ends, legacy industrial equipment service and repair, audio signal conditioning, and general purpose switching where a hermetic PNP device is required. Its availability as a Central Semiconductor remanufacture of an industry-standard type makes it a go-to part for maintaining legacy European-origin BCY79 bill-of-materials. Design considerations: verify the pin mapping against the TO-18 drawing before layout, as BCY79-family pin order (emitter-base-collector with case tied to collector) differs from many other TO-18 transistors; derissipation above 340 mW free-air requires consideration of the 1 W case rating. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
BCY79-VII-TIN-LEAD - PNP 45V 100mA TO-18 BJT | Central Semiconductor
The Central Semiconductor BCY79-VII-TIN-LEAD is a PNP silicon planar epitaxial bipolar junction transistor (BJT) rated for 45V collector-base voltage (VCBO), 5.0V emitter-base voltage (VEBO), and 100mA collector current, housed in a hermetic JEDEC TO-18 metal can package with a tin/lead-plated finish for superior solderability in wave-solder and through-hole assembly processes. A bipolar junction transistor is a three-terminal current-controlled semiconductor device that amplifies or switches electronic signals. In the broader hierarchy, this small-signal PNP transistor sits within the discrete semiconductor family, complementing NPN devices for complementary push-pull stages and serving as a fundamental building block of analog signal chains in audio, industrial, and instrumentation electronics. Key features of the BCY79-VII include its 45V VCBO breakdown rating, which provides generous headroom for 24V industrial rails; the low-noise characteristics that made the BCY79 family a classic choice for audio input and driver stages; the hermetic TO-18 metal can, which offers excellent thermal stability, light immunity, and moisture resistance far exceeding plastic packages; and the VI gain-group classification, denoting a specified DC current gain (hFE) bin as defined in the Central Semiconductor datasheet. The planar epitaxial construction delivers stable gain and low leakage across the operating temperature range. The metal TO-18 case also provides a low thermal resistance path to the PCB, supporting the device's dissipation rating and reliable long-term operation in harsh environments where plastic-packaged alternatives would degrade. Typical applications include low-noise audio amplifier input stages, driver stages, discrete analog signal conditioning, instrumentation front ends, and legacy industrial equipment maintenance where the original BCY79 family was designed-in decades ago. The tin/lead finish is especially valued for repair of legacy assemblies originally built with leaded solder. Design consideration: verify the hFE bin (group VII) against your bias network, since the BCY79 family spans multiple gain groups (VI through X) with different hFE ranges; substituting across groups changes bias point and distortion performance. This page synthesizes distributor availability data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing a single source of truth for engineers maintaining legacy designs.
BFP780H6327XTSA1 - SiGe NPN RF Transistor 6.1V | Infineon
The Infineon BFP780H6327XTSA1 is a single-stage, high-linearity, high-gain NPN silicon-germanium (SiGe) RF driver amplifier transistor rated at 6.1 V collector-emitter voltage, 120 mA collector current and 600 mW total power dissipation, housed in a 4-pin PG-SOT343-4-1 (SC-82A) surface-mount package. It is not internally matched, giving designers full freedom over input and output matching networks. An RF bipolar junction transistor (BJT) is a discrete semiconductor device used to amplify radio-frequency signals in the transmit or receive chain of wireless systems. Within the component hierarchy it sits under discrete semiconductors > transistors > bipolar RF transistors, and it competes with pHEMT and GaAs MMIC amplifiers where cost, linearity and bias flexibility matter. Key features include a minimum noise figure (NFmin) of 1.2 dB at 900 MHz (5 V, 30 mA bias), an output third-order intercept point (OIP3) of 34.5 dBm at 900 MHz (5 V, 90 mA), and an output P1dB compression point (OP1dB) of 23 dBm at 900 MHz. The maximum RF input power (PRFin,max) is 20 dBm, providing robustness against mismatch and overload events. Technically, the BFP780 family is built on Infineon's silicon-germanium process, which offers higher transition frequency and improved linearity per milliamp compared with standard silicon BJTs, making it attractive for driver-amplifier stages where adjacent-channel power must be minimized. The DC current gain hFE is at least 85 at 90 mA, 5 V, simplifying bias network design. Operating junction temperature is rated to 150 C. Typical applications include 900 MHz ISM-band driver amplifiers, cellular and LPWAN transmitter driver stages, general-purpose RF gain blocks from HF through UHF, and low-noise amplifier front ends where NFmin of 1.2 dB is acceptable. When designing with this device, plan external input/output matching for your band of interest and verify stability across bias conditions, since the transistor is not internally matched. Thermal layout on the PCB directly affects power handling in the SOT-343 footprint. This page synthesizes distributor pricing, verified specifications, alternatives and practical design notes not found in the manufacturer datasheet alone, as of 2026-10-04.
BFU520 - NPN Wideband RF Transistor 2GHz | NXP Semiconductors
The NXP Semiconductors BFU520 is an NPN silicon wideband RF transistor designed for high-speed, low-noise small-signal applications, housed in a plastic 4-pin dual-emitter SOT143B surface-mount package. Key headline parameters include a 12 V collector-emitter rating, 30 mA collector current capability, and usability in small-signal to medium-power circuits up to 2 GHz. A wideband silicon RF transistor is a bipolar junction transistor (BJT) optimized for amplification of radio-frequency signals over very broad bandwidths, rather than at a single narrow frequency. Within the component hierarchy, it belongs to the discrete semiconductor family: transistor -> bipolar RF transistor -> wideband RF transistor -> RF front-end component. Its NPN bipolar construction provides the high transition frequency and low flicker noise needed in RF gain blocks where compound alternatives are unnecessary or cost-prohibitive. Key features of the BFU520 include its dual-emitter SOT143B package, which simplifies PCB layout for common-emitter amplifiers by providing two separate emitter connections and reducing parasitic inductance in the emitter path. The device supports 12 V collector supply rails, making it directly compatible with 12 V RF system buses, and its low noise figure makes it attractive for receiver front ends. The BFU520 is a member of the BFU5 family, which shares a common die and package strategy across gain grades such as BFU520A and BFU520X. Technically, the device uses NXP's silicon RF bipolar process, achieving transition frequencies well into the GHz range while maintaining stable hFE and low intermodulation distortion at small-signal drive levels. Biasing is typically accomplished with a resistive divider and emitter degeneration, and the dual-emitter arrangement allows one emitter for RF grounding and one for feedback or degeneration, giving designers topology flexibility. Typical applications include LNA (low-noise amplifier) front ends, IF and RF gain blocks, buffer and driver amplifiers, and oscillator stages in professional and consumer radio equipment up to 2 GHz. Its 12 V rating suits basestation auxiliary circuits, cable TV distribution gear, and test instrumentation. A key design consideration is thermal and layout discipline: the SOT143B is a small package, so emitter connections must be grounded with multiple vias to minimize inductance, and collector dissipation should be kept within ratings with adequate copper area. This page synthesizes distributor data, gain-grade alternatives, and practical design notes not found in the manufacturer datasheet alone.
BFU520A - NPN Wideband RF Transistor SOT23 | NXP
The NXP Semiconductors BFU520A is an NPN silicon wideband RF transistor designed for high-speed, low-noise applications, packaged in a 3-pin plastic SOT23 (TO-236-3) surface-mount outline and qualified to AEC-Q101. It belongs to the BFU5 family of RF transistors and supports small-signal to medium-power operation at frequencies up to 2 GHz. An RF bipolar junction transistor (BJT) is a three-terminal semiconductor amplifier device optimized for use at radio frequencies, where conventional general-purpose transistors suffer gain roll-off and excess noise. Within the product hierarchy, the BFU520A sits in the discrete semiconductors category: semiconductor -> transistor -> bipolar junction transistor -> RF/wideband NPN transistor. Devices in this class are characterized by transition frequency, noise figure, breakdown voltage, and gain figures, and are commonly used in the first stages of receiver front-ends where the signal is weakest and noise performance dominates. Key features of the BFU520A include its low-noise, high-breakdown construction - an unusual combination, since low-noise RF devices often trade off voltage headroom. The AEC-Q101 qualification means the device has passed the automotive disrete-semiconductor stress qualification standard, supporting use in vehicle-mounted communication and infotainment systems. The SOT23 package provides a compact footprint (approximately 2.9 mm x 1.3 mm body) with good thermal dissipation to the PCB through the leads, and allows automated pick-and-place assembly. Technically, the BFU520A uses a silicon NPN structure optimized for wideband gain into the GHz range, making it suited to LNA (low-noise amplifier) front ends, IF/RF gain stages, and buffer amplifiers. As part of the BFU5 family, it offers designers multiple gain/noise/breakdown operating points within a consistent package and biasing approach, easing second-source selection within a product roadmap. Typical applications include LNA input stages for 2 GHz-band receivers, RF gain blocks in cellular and ISM-band radios, IF amplifier chains in satellite and cable set-top tuners, and general-purpose wideband buffering in instrumentation. Because it is AEC-Q101 qualified, it also fits telematics and connected-car radio modules. A key design consideration is biasing: this class of device is usually biased via a resistive divider with an RF choke or collector resistor, and stability requires careful attention to source/load impedances at VHF/UHF to avoid oscillation - follow the manufacturer datasheet s-parameter data. This page synthesizes distributor availability, family drop-in alternatives, pinout, and practical design notes not consolidated in the manufacturer datasheet alone.
BFU520AR - NPN RF Transistor 12V 30mA 10GHz | NXP
The NXP Semiconductors BFU520AR is an NPN wideband silicon RF bipolar junction transistor rated for 12 V collector-emitter voltage, 30 mA collector current, and a transition frequency of 10 GHz, delivering up to 450 mW of total power dissipation in a 3-pin SOT-23 (TO-236AB) surface-mount package. An RF BJT is a transistor optimized for amplification of high-frequency small signals, forming part of the semiconductor hierarchy: RF transistor -> bipolar junction transistor -> discrete semiconductor. Wideband RF transistors like the BFU520AR are used as low-noise amplifiers (LNA), oscillators, and buffers in RF front-end chains, where gain-bandwidth product and noise figure, not DC gain, are the dominant design parameters. Key features include a 10 GHz transition frequency supporting operation well beyond the BFU5 family's intended small-signal to medium-power band up to 2 GHz, low-noise high-breakdown construction for receiver front ends, and a compact industry-standard SOT-23 footprint. The device is positioned within the BFU5 family of NPN wideband transistors intended for high-speed, low-noise applications. Technically, the BFU520AR uses a silicon NPN epitaxial structure with geometry scaled for microwave transition frequencies; the reduced emitter-base and collector capacitances that enable the 10 GHz fT also deliver usable gain in VHF, UHF, and microwave links up to several GHz. The 450 mW power dissipation rating supports medium-power driver stages at RF with proper PCB copper heat-spreading. Typical applications include low-noise amplifier input stages in 2.4 GHz and sub-6 GHz receivers, VCO and oscillator stages in RF synthesizers, and general-purpose wideband IF/RF gain blocks in communication equipment. Design consideration: bias stability is critical - use emitter degeneration or temperature-compensated bias networks, since fT and noise figure degrade rapidly at collector currents outside the datasheet optimum point. This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet. Pricing references are as of 2026-09-13.
BFU520AVL - NPN RF Transistor 12V 10GHz SOT-23 | NXP
The NXP Semiconductors BFU520AVL is an NPN wideband silicon RF bipolar junction transistor (BJT) rated for 12V, 30mA, and operation up to 10GHz transition frequency, delivering 450mW maximum power dissipation in a 3-pin SOT-23 (TO-236AB) surface-mount package. An RF bipolar transistor is a discrete semiconductor device used to amplify or switch high-frequency signals. Within the discrete-transistor hierarchy (BJT -> small-signal RF transistor -> RF/microwave component), devices like the BFU520AVL form the front-end gain stages of wireless systems, where low noise and stable gain at gigahertz frequencies matter more than raw power handling. The BFU5 family from NXP targets small-signal to medium-power applications up to 2GHz. Key features include low-noise, high-breakdown RF performance, a transition frequency specification of up to 10GHz (supporting operation up to the 2GHz upper design band), 450mW power dissipation, and a compact, industry-standard 3-pin SOT-23 footprint that simplifies PCB layout and enables automated assembly. The 12V collector-emitter rating provides headroom for battery- and mains-powered radio designs. Architecturally, the BFU520A uses a silicon NPN bipolar process optimized for wideband gain and low noise at RF. NXP characterizes it for high-speed, low-noise amplifier stages such as LNAs and driver amplifiers in the several-hundred-MHz to 2GHz range. Per the manufacturer product page, the BFU520A is part of the BFU5 family of transistors, suitable for small signal to medium power applications up to 2 GHz. Typical applications include VHF/UHF and 2GHz LNA input stages, IF amplifier stages in receivers, local-oscillator buffers, RF driver stages in short-range radio links, and general-purpose small-signal RF gain blocks in test equipment and industrial wireless modules. Design consideration: bias the device with a stable DC operating point (resistive divider or active bias) and use emitter/collector RF matching networks; keep ground return paths short because at multi-GHz transition frequency layout parasitics dominate performance. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
BFU520R - NPN 12V 10.5GHz Wideband RF Transistor | NXP
The NXP Semiconductors BFU520R is an NPN wideband silicon RF bipolar junction transistor (BJT) rated for 12V operation with a transition frequency of 10.5 GHz and 450 mW total power dissipation, housed in a plastic 4-pin dual-emitter SOT-143B surface-mount package. An RF bipolar transistor is a discrete semiconductor device used to amplify or switch high-frequency signals. Within the component hierarchy, it sits under NPN BJT -> bipolar transistor -> transistor -> discrete semiconductor. The BFU5 family from NXP targets small-signal to medium-power applications up to 2 GHz, where low noise and high breakdown voltage are the key selection criteria. Key features include low noise figure suitable for front-end LNAs, high breakdown voltage for robust operation, AEC-Q101 automotive qualification, and operation up to 2 GHz in small-signal to medium-power roles. DigiKey lists the part as an RF transistor NPN 12V 30mA 10.5GHz 450mW, while FindIC cites 16V collector-emitter breakdown class and 0.05A current rating for the automotive-qualified device. The dual-emitter SOT-143B construction minimizes emitter lead inductance, which directly improves gain at high frequencies and preserves noise performance. The die uses NXP silicon RF bipolar process technology optimized for wideband amplifiers, gain blocks, and oscillator stages in RF signal chains. Typical applications include VHF/UHF antenna amplifiers, LNA front ends in receivers, ISM band transmitters, and automotive RF systems requiring AEC-Q101 qualified discretes. Design consideration: bias network stability and emitter grounding are critical - keep the dual-emitter connection directly to a ground pour to exploit the low-inductance package and avoid gain ripple above 1 GHz. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
BFU520W - NPN 2GHz Low Noise RF Transistor | NXP
The NXP Semiconductors BFU520W is an NPN wideband silicon RF transistor for high-speed, low-noise applications, housed in a plastic 3-pin SOT323 (SC-70/SOT323, SC-70 family) surface-mount package and suited for small-signal to medium-power use up to 2 GHz. An RF bipolar junction transistor (BJT) is a discrete semiconductor amplifier device optimized for gain and noise figure at radio frequencies, sitting within the transistor hierarchy: BFU520W -> NPN silicon RF transistor -> small-signal BJT -> discrete semiconductor -> semiconductor device. Unlike general-purpose switching BJTs, RF transistors such as the BFU5 family are characterized at megahertz-to-gigahertz frequencies with S-parameters, noise figures, and gain figures that general-purpose parts never specify. Key features include low-noise, high-breakdown RF performance in a very small footprint, AEC-Q101 qualification for automotive reliability, and membership in the NXP BFU5 family that supports small-signal through medium-power designs up to 2 GHz. These attributes make the BFU520W attractive where board area, reliability qualification, and noise performance must coexist, such as receiver front ends and IF/RF gain blocks. Architecturally, the device is an NPN silicon BJT whose die and lead-frame geometry are optimized to minimize parasitic capacitance and inductance, preserving gain-bandwidth product and stability at UHF and lower microwave frequencies. NXP provides the BFU5 family so designers can scale current and package options while keeping bias and layout methodologies consistent. Typical applications include low-noise amplifier (LNA) input stages in receivers, IF and RF gain stages in communication equipment, and oscillators/buffers operating up to 2 GHz. Design consideration: the SOT323 package has extremely short leads, so stray inductance from long traces or vias rapidly degrades RF performance; use solid ground planes and short, decoupled input/output traces. This page synthesizes verified manufacturer data, pricing references, drop-in alternatives, and practical RF layout notes not found in the standard NXP datasheet.
BFU520WF - NPN RF Transistor 12V 11GHz SOT323 | NXP
The NXP Semiconductors BFU520WF is an NPN wideband silicon RF bipolar transistor in a plastic 3-pin SOT323 (SC-70) package, delivering a minimum noise figure of 0.6 dB at 900 MHz, a maximum stable gain of 18.5 dB at 900 MHz, and an 11 GHz fT silicon technology, with 12 V collector-emitter and 450 mW total power ratings. A wideband RF transistor is a small-signal bipolar junction transistor optimized for high-frequency gain and low noise rather than power switching. Within the amplifier hierarchy, it sits as the active element of RF amplifiers, which in turn belong to the broader categories of analog signal chain components and semiconductor discrete devices. The BFU5 family is aimed at small-signal to medium power applications up to 2 GHz. Key features include its exceptionally low 0.6 dB NFmin, high breakdown voltages for headroom in high-supply designs, AEC-Q101 qualification for automotive reliability, and the compact surface-mount SOT323 footprint that saves PCB area in dense RF layouts. Technically, the device uses NXP's 11 GHz fT silicon process, providing usable gain well into the GHz range while maintaining low 1/f-corner noise, which benefits receiver front-end sensitivity and oscillator phase-noise performance. The high breakdown rating distinguishes it from typical low-voltage mmWave BJTs. Typical applications include low-noise amplifiers for ISM-band receivers, broadband amplifiers up to 2 GHz, and ISM-band oscillators where a high fT and clean noise floor are required. Design consideration: bias the device for the target noise-match point using an inductor-source or resistive emitter topology, and verify stability (K-factor) across the full band since high-gain RF BJTs can oscillate without careful input/output matching. This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.
BFU520XR - NPN RF Transistor 2GHz SOT143R | NXP
The NXP Semiconductors BFU520XR is an NPN wideband silicon RF transistor for high-speed, low-noise applications, housed in a 4-pin dual-emitter SOT143R plastic package, suitable for small-signal to medium-power use up to 2 GHz with a continuous collector current of 50 mA. An RF wideband transistor is a small-signal bipolar junction transistor (BJT) optimized for gain and low noise at radio frequencies, rather than for switching or power conversion. Within the component hierarchy, it sits under NPN BJT -> RF transistor -> wideband transistor -> discrete RF semiconductor. Such devices form the front-end gain blocks of receivers, IF amplifiers, and buffer stages where maintaining signal-to-noise ratio matters more than raw output power. Key features of the BFU520XR include operation up to 2 GHz in the BFU5 family performance class, a 50 mA collector current rating for small-signal to medium-power service, and the SOT143R package with dual emitter pins. The dual-emitter pinout provides two separate emitter bonds, which reduces emitter lead inductance - a critical factor for stable, high-gain operation at gigahertz frequencies and for flexible grounding on the PCB. Technically, the device is a silicon NPN planar transistor designed by NXP for wideband linear amplification. Its transition frequency class and low-noise figure make it appropriate for L-band and related RF bands, as reflected in its classification as an L-band small-signal RF bipolar transistor in distributor databases. The SOT143R footprint is a four-lead surface-mount gull-wing package that assembles on standard SMT lines without special handling. Typical applications include wideband amplifier stages in receivers, IF and RF buffer amplifiers, low-noise front-end gain blocks, and general-purpose amplification up to 2 GHz in communication equipment. When designing with the BFU520XR, pay close attention to emitter grounding: keep the emitter connections to the ground plane short and direct, since series inductance degrades gain and stability at 1-2 GHz. Bias stabilization of the collector current is essential for consistent noise figure and gain. This page synthesizes verified manufacturer data, distributor availability, drop-in alternatives, and practical RF layout guidance not found together in the manufacturer datasheet.
BU931T - 15A, 400V NPN Power Darlington Transistor | STMicroelectronics
The BU931T is an NPN power Darlington transistor manufactured by STMicroelectronics, designed for high-current switching applications. It features a collector-emitter voltage (VCEO) of 400V, a continuous collector current (IC) of 15A, and a peak collector current of 30A. The device is housed in a TO-220 package, providing excellent thermal performance for power dissipation up to 125W. With a DC current gain (hFE) of 500 minimum at 10A, it offers high current amplification, making it suitable for motor control, power supplies, and automotive ignition systems. A Darlington transistor is a compound structure consisting of two bipolar junction transistors (BJTs) connected in a Darlington pair configuration, where the emitter of the first transistor drives the base of the second. This configuration provides extremely high current gain, typically in the range of 1000 to 10000, compared to a single BJT. Darlington transistors are widely used in high-current switching applications where a low base current is required to control a large collector current. They are part of the broader family of power transistors, which also includes MOSFETs and IGBTs, and are essential components in power electronics for amplification and switching. Key features of the BU931T include a collector-emitter saturation voltage (VCE(sat)) of 2.0V maximum at IC=10A, ensuring low power loss during conduction. The device also offers a fast switching speed with a fall time of 1.5 microseconds, making it suitable for high-frequency applications up to 10 kHz. The integrated base-emitter resistor and base-emitter diode enhance reliability by preventing spurious turn-on due to leakage currents. The TO-220 package is lead-free and RoHS compliant, meeting modern environmental standards. Technically, the BU931T utilizes a triple-diffused planar process, providing robust avalanche energy handling and a wide safe operating area (SOA). The device can withstand a collector-emitter breakdown voltage (BVCEO) of 400V and a collector-base voltage (VCBO) of 500V, ensuring high voltage robustness. The thermal resistance from junction to case (RthJC) is 1.0°C/W, allowing efficient heat transfer to an external heatsink. The operating junction temperature range is -65°C to +150°C, making it suitable for harsh environments. Typical applications include motor control circuits, switching power supplies, automotive ignition systems, and solenoid drivers. In motor control, the BU931T can switch DC motors up to 15A, providing reliable on/off control. In automotive ignition, its high voltage and current ratings ensure dependable performance in demanding conditions. The device is also used in welding equipment and battery chargers where high current switching is required. When designing with the BU931T, ensure adequate base drive current to achieve low saturation voltage. A base current of at least 1/250 of the collector current is recommended. Additionally, use a suitable heatsink to maintain junction temperature below 150°C, especially at high current levels. Proper snubber circuits may be required to protect against inductive load transients.
BU941ZT - 15A, 350V NPN Power Transistor | STMicroelectronics
The STMicroelectronics BU941ZT is a high-voltage, high-current NPN power transistor designed for demanding switching and linear applications. It delivers a continuous collector current of 15A and supports a collector-emitter voltage of 350V, making it suitable for power management, motor control, and industrial systems. The device is housed in a TO-220 package, which provides excellent thermal performance and is widely used in through-hole PCB designs. A power transistor is a three-terminal semiconductor device used to amplify or switch electronic signals and electrical power. In the hierarchy of power electronics, the BU941ZT is a bipolar junction transistor (BJT), which falls under the category of discrete semiconductors, specifically power transistors. BJTs are current-controlled devices where a small base current controls a larger collector current, enabling efficient power regulation and switching in circuits such as power supplies, inverters, and motor drivers. Key features of the BU941ZT include a high collector-emitter voltage rating of 350V, a continuous collector current of 15A, and a low saturation voltage that minimizes power loss during conduction. The device also offers a high DC current gain (hFE) for efficient base drive, and a fast switching speed suitable for applications up to several kilohertz. The TO-220 package includes a metal tab for heatsinking, allowing the transistor to dissipate significant power when properly mounted. Technically, the BU941ZT is fabricated using STMicroelectronics' advanced bipolar process, which ensures high ruggedness and reliability under stressful operating conditions. The device features a wide safe operating area (SOA) and built-in protection against overcurrent and overtemperature, making it robust for industrial environments. Its low saturation voltage (VCE(sat)) of typically 1.5V at 15A reduces conduction losses, improving overall system efficiency. Typical applications include switch-mode power supplies (SMPS), motor control circuits, inverters, and battery chargers. In an SMPS, the BU941ZT can be used as the main switching element, handling high voltages and currents while maintaining low losses. In motor control, it drives inductive loads with fast switching and high current capability. The device is also suitable for linear regulators and audio amplifiers where high power handling is required. When designing with the BU941ZT, ensure adequate base drive current to fully saturate the transistor and minimize power dissipation. Use a proper heatsink or thermal pad to manage the heat generated during operation, especially at high currents. Additionally, consider adding a flyback diode across inductive loads to protect the transistor from voltage spikes during switching.
CGD65A055S2 - 650V 55mΩ GaN HEMT with ICeGaN Gate | Cambridge GaN Devices
The Cambridge GaN Devices CGD65A055S2 is an enhancement-mode GaN-on-silicon power transistor rated at 650 V drain-to-source voltage and 55 mΩ on-resistance, delivered in a 16-pin DFN 8x8 surface-mount package. The part exploits the unique wide-bandgap properties of gallium nitride to achieve high current capability (27 A pulsed), high breakdown voltage, and high switching frequency operation in a single chip-scale footprint. What is a GaN HEMT? A GaN HEMT (Gallium Nitride High Electron Mobility Transistor) is a wide-bandgap field-effect transistor built on an AlGaN/GaN heterojunction. Compared with traditional silicon MOSFETs, GaN HEMTs offer lower on-resistance per unit area, zero reverse-recovery charge (Qrr), and much faster switching edges. They belong to the broader hierarchy of power semiconductors (power transistor → FET → HEMT → GaN HEMT → wide-bandgap device) and are typically deployed in switched-mode power supplies (SMPS), where they enable higher power density and efficiency than silicon super-junction MOSFETs. Key features of the CGD65A055S2 include CGD's proprietary ICeGaN™ gate technology, which makes the device directly compatible with virtually all standard gate drivers and controller ICs without requiring a negative-rail bias supply. The device integrates a current-sense (CS) pin that outputs a proportional signal of the drain current, eliminating the need for an external shunt resistor in many topologies. An integrated NL³ (non-linear, low-loss, low-R) circuit reduces dead-time losses in half-bridge configurations, improving overall converter efficiency. Typical applications include totem-pole bridgeless PFC, LLC and QR flyback converters, half-bridge and full-bridge motor drivers, on-board chargers (OBC), telecom rectifier modules, and Class-D audio amplifiers where audio-grade linearity and high dV/dt immunity are required. The 650 V rating provides generous derating margin for universal-input AC/DC converters operating from rectified 230 VAC mains. When designing with this device, ensure the gate-drive loop inductance is minimized to keep switching edges clean. Use a 4.7-10 Ω external gate resistor and Kelvin-source connection where available. Place a small ferrite bead or RC snubber on the switching node to damp high-frequency ringing caused by the very fast dV/dt capability of the GaN die.
CGD65B200S2 - 650V 200mΩ ICeGaN™ GaN HEMT | Cambridge GaN Devices
The Cambridge GaN Devices CGD65B200S2 is an enhancement-mode GaN-on-silicon power transistor rated at 650 V drain-to-source breakdown and 200 mΩ typical on-resistance, housed in an 8-pin PowerVDFN (DFN5x6) surface-mount package. The device exploits the unique material properties of Gallium Nitride (GaN) to deliver high current, high breakdown voltage, and high switching frequency operation for a wide range of electronics applications including industrial power conversion, consumer adapters, and motor drives. A GaN HEMT (High Electron Mobility Transistor) is a wide-bandgap power semiconductor whose heterojunction (typically AlGaN/GaN) creates a two-dimensional electron gas (2DEG) channel with electron mobility roughly 10x higher than silicon. Compared with conventional silicon MOSFETs of similar voltage rating, GaN HEMTs offer lower switching losses, smaller output capacitance charge (Qoss), zero reverse-recovery charge, and the ability to switch at MHz-class frequencies — enabling smaller magnetics and higher power density. The CGD65B200S2 belongs to the ICeGaN™ family of GaN-on-Si power transistors and sits within the discrete-transistor → power MOSFET → wide-bandgap power semiconductor hierarchy. Key features include a 200 mΩ typical R_DS(on) at the recommended gate drive, a 650 V drain-source rating suitable for 400 V rectified bus operation, and a threshold voltage compatible with standard gate drivers. The device integrates CGD's ICeGaN™ gate input circuitry that allows it to be driven by virtually any gate driver or PWM controller chip without the negative-bias requirements typical of early-generation GaN HEMTs. The package provides a low thermal-resistance path and Kelvin-source capability for high-frequency switching performance. Typical applications span industrial SMPS, telecom rectifier stages, totem-pole bridgeless PFC, photovoltaic micro-inverters, and Class-D audio output stages. For high-frequency soft-switched topologies the part enables 100-500 kHz operation with substantially higher efficiency than silicon super-junction MOSFET equivalents, reducing heatsink and magnetics BOM cost in adapter and server PSU designs.
DRDNB21D-7 - Dual Relay Driver Array, 100mA, SOT-363 | Diodes Inc
The Diodes Incorporated DRDNB21D-7 is a complex array for dual relay driver applications, integrating two pre-biased NPN transistors and two switching diodes in a single SOT-363 (SC-88, 6-TSSOP) surface-mount package. According to the Diodes Incorporated datasheet, the device is rated for 100 mA output current per channel in a 1:1 bipolar power switch/driver topology, with a peak output capability suitable for inductive relay and solenoid loads. What is a relay driver array? A relay driver array is an integrated multi-component module that consolidates the discrete transistors, base resistors, and free-wheeling diodes typically required to drive electromechanical relays or similar inductive loads. By packaging these elements together, the array reduces PCB footprint, simplifies BOM, and improves reliability by eliminating wiring errors between discrete components. The DRDNB21D sits at the top of the discrete semiconductor hierarchy: relay driver array -> power switch/driver -> PMIC -> semiconductor device. Key features include epitaxial planar die construction, integrated pre-biased transistor configuration that eliminates external base resistors, and built-in switching diodes that protect against back-EMF from inductive loads. The compact SOT-363 package measures only 2.0 mm × 1.25 mm × 0.95 mm, enabling high-density PCB layouts. Surface-mount termination supports tape-and-reel packaging for automated assembly processes, and the device is RoHS compliant. The DRDNB21D-7 functions as a 1:1 low-side power switch with bipolar transistor technology. The integrated architecture allows each channel to sink up to 100 mA continuously, with internal base biasing networks sized to interface directly with logic-level microcontroller GPIO pins (typically 3.3 V or 5 V). The switching diodes are oriented to clamp inductive kickback when the relay coil is de-energized, protecting the driver transistors from reverse-voltage transients. Typical applications include automotive relay modules, industrial control boards driving small signal relays or solenoids, HVAC control circuits, and home appliance switching subsystems. The device is also commonly used in telecom line cards and security system relay drivers where a compact, integrated solution reduces board area and assembly cost. When designing with the DRDNB21D-7, ensure that the relay coil current does not exceed 100 mA per channel and that PCB traces to the relay can handle the peak inrush current. The integrated diodes eliminate the need for external flyback protection, but thermal management of the SOT-363 package becomes critical at high duty cycles above 50%. This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet alone, providing engineering decision support for sourcing and design.
E(T - Component Reference | Datasheet Search Resource
The MPN string "E(T" is not a complete, validated electronic component part number; it appears in retrieved web data only as a fragment of suffix-flagged bipolar transistor parts (for example Unisonic Technologies 2SD882-E-T, S8050L-E-T, HE8050-E-T, 2SB772-E-T) and does not map to a unique catalog device on its own. Per data-authenticity rules this page records E(T as a non-resolvable token rather than guessing a specific manufacturer, package, voltage, or current rating. A suffix-flagged bipolar junction transistor (BJT) is a discrete semiconductor in which the die is identified by an alphanumeric manufacturer suffix such as "-T" or "-E-T" that typically denotes tape-and-reel packaging, lead-free finish, and/or an engineering sample. Within the BJT taxonomy, these parts are NPN or PNP silicon transistors used for small-signal amplification and low-power switching, which sit below regulators and gate drivers in the discrete-semiconductor -> transistor -> BJT hypernymy chain. The "-E-T" suffix convention in the verified Unisonic Technologies dataset collocates with low-VCEO NPN small-signal transistors (e.g., S8050L-E-T, HE8050-E-T), suggesting tooling tape-and-reel, lead-free (Pb-free) finish, and a 92-style TO-92-like through-hole package. Engineers commonly use the full MPN plus suffix when sourcing, because bare stems like "E(T" cannot reliably disambiguate the underlying die. Typical end-equipment applications for the underlying -E-T suffixed BJTs include small-signal amplification stages in audio pre-amplifiers, low-side switching in relay and solenoid driver circuits, level-shifting interfaces between logic-level microcontrollers and higher-current loads, and general-purpose linear regulators or sensor signal conditioning. When evaluating a quoted "E(T" string, request the full MPN plus suffix from your vendor, then cross-check the resulting datasheet against parameters such as VCEO, IC continuous, hFE, and package outline before placing the part on a BOM. If a quoted string omits the prefix, the buyer is exposed to mis-shipping risk. This page combines partial-token web data, validated Unisonic suffix conventions, and a list of recommended full-MPN drop-in candidates so engineers can resolve ambiguous "E(T" quotations into a buyable, traceable part number.
EMB10T2R - Dual PNP Digital Transistor 50V 100mA EMT6 | ROHM
The Rohm Semiconductor EMB10T2R is a dual PNP pre-biased bipolar transistor array housed in a compact EMT6 (SOT-563 equivalent) surface-mount package. Each channel integrates a PNP bipolar junction transistor with built-in bias resistors, forming a complete digital transistor in a single chip that requires only one external resistor (the base series resistor R_B) for switching operation. A digital transistor (also called a bias-resistor-built-in transistor, or BRT) is a discrete BJT with one or two monolithic resistors integrated on the same die, replacing the discrete base-resistor network that designers would otherwise place around a standard transistor. It belongs to the hierarchy: digital transistor -> pre-biased BJT array -> bipolar transistor array -> discrete semiconductor. The integration of bias resistors eliminates roughly three external components per channel and removes the need for precise resistor matching, which simplifies PCB layout, shrinks BOM count, and improves switching consistency in high-volume manufacturing. Key features include a collector-emitter voltage rating of 50V, continuous collector current of 100mA per channel, transition frequency of 250 MHz, and total device power dissipation of 150 mW. The package is a 6-lead EMT6 measuring approximately 1.6 mm x 1.6 mm, making it among the smallest dual-transistor products on the market. The integrated bias resistors are 10 kohm typical, and the design supports direct drive from MCU GPIO pins or logic-level signals without external biasing components. The architecture uses a PNP silicon epitaxial planar die with polysilicon bias resistors, providing tight R1/R2 tolerance and good thermal matching between the two channels. The symmetrical dual-channel layout simplifies PCB routing for complementary switching or differential amplifier front-ends. Typical applications include interface circuits, level shifters, signal buffering, LED driver for museum display panels, and pre-amplifier differential amplification in portable devices. It is also used as a high-frequency oscillator building block and gate driver for low-power MOSFETs in industrial control modules. When designing with this device, note that Rohm has designated the EMB10 as Not Recommended for New Designs. For new designs, evaluate the UMB10N (industry equivalent) or IMB10A (industry equivalent) families. The dual-channel matching makes it well-suited for differential pairs where channel-to-channel gain and Vbe tracking matter. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing a one-stop engineering reference for sourcing and second-source qualification.