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FMMT717TA - 12V PNP 2.5A Low-Saturation BJT | Diodes Incorporated
The Diodes Incorporated FMMT717TA is a 12V PNP silicon low-saturation bipolar junction transistor (BJT) housed in a SOT-23-3 surface-mount package, designed for high-current switching and gate-driving applications. It delivers a continuous collector current of -2.5 A and supports peak pulse currents up to -10 A, with a power dissipation rating of 625 mW and a transition frequency of 110 MHz. The device features BVCEO > -12 V, a minimum DC current gain (hFE) of 300 at -100 mA / -2 V, and an exceptionally low saturation voltage of approximately -17 mV at -100 mA, with RCE(sat) of 72 mΩ at -2.5 A. A PNP bipolar junction transistor (BJT) is a three-terminal semiconductor device in which a p-doped emitter, n-doped base, and p-doped collector are arranged so that the device conducts when the base is pulled below the emitter potential. Low-saturation transistors are a specialized subcategory engineered to minimize VCE(sat) so that the device behaves like a near-ideal closed switch, reducing conduction losses in switching regulators, motor drivers, and high-side MOSFET gate drivers. The FMMT717 belongs to Diodes Incorporated's FMMT7xx SuperSOT family, which complements the NPN FMMT6xx series. Key differentiating features include a very low equivalent on-resistance of 72 mΩ at full rated current, hFE characterized up to -10 A for high current gain hold-up across the operating range, and a complementary NPN type (FMMT617) for symmetric half-bridge designs. The SOT-23-3 footprint provides a compact PCB area while supporting 625 mW continuous dissipation when properly land-patterned onto adequate copper pour. Typical applications include DC-DC converter synchronous rectification, MOSFET gate drivers for P-channel devices, power management load switches, battery chargers, motor control H-bridges, and low-voltage power management in industrial and consumer systems. The low VCE(sat) directly reduces conduction losses, which improves overall efficiency and thermal performance in switching topologies. Designers should note that this part is a low-VCEO (12 V) device, making it suitable only for sub-12 V bus systems; for 20 V or 30 V applications, the higher-VCEO FMMT720 should be selected. The complementary NPN FMMT617 shares the same SOT-23-3 footprint and enables compact half-bridge and push-pull topologies without layout rework. This page synthesizes distributor pricing, drop-in alternatives, application pairings, and practical design notes that extend beyond the manufacturer datasheet, supporting component selection, second-source qualification, and BOM risk reduction.
FZT849TA - 30V 7A NPN BJT, 100MHz, SOT-223 | Diodes Incorporated
The Diodes Incorporated FZT849TA is a 30V NPN silicon planar medium-power bipolar junction transistor rated for 7A continuous collector current and 20A peak pulse current, housed in a SOT-223 surface-mount package with a collector-tab thermal pad. It features a transition frequency of 100 MHz, a power dissipation of 3 W at 25 °C ambient on the recommended copper pad, and an extremely low equivalent on-resistance RCE(sat) of 36 mΩ at 5A. A bipolar junction transistor (BJT) is a three-terminal semiconductor device formed by sandwiching either P-type or N-type material between two layers of the opposite polarity, creating either NPN or PNP polarity. BJTs use a small base current to control a much larger collector current, acting as a current amplifier or a saturated switch. The FZT849TA belongs to the NPN variant and is engineered for medium-power switching and linear applications where a saturated high-side or low-side switch must deliver several amps with low conduction loss. Key features include a VCBO of 60V, VCER of 40V, low VCE(sat) of 250 mV typical at 6.5 A, complementary PNP partner FZT949, and a built-in collector-tab that simplifies PCB heatsinking. The device is lead-free, RoHS compliant, halogen-free, and qualified to AEC-Q101 for automotive power-management and lighting loads. Architecturally, the FZT849TA uses a planar epitaxial base design with a high-current die capable of sustaining 20A pulsed for inductive-load switching. The SOT-223 footprint exposes the collector through the rear tab, reducing thermal resistance from junction to ambient (θJA) to roughly 76 °C/W on the datasheet's reference copper pad, allowing multi-watt dissipation without a discrete heatsink. Typical applications include DC-DC converter pass elements, motor driver low-side switches, automotive relay replacement, solenoid drivers, LED current regulators, and battery-protection circuits. The combination of high ICM and low VCE(sat) makes it especially suited for portable and automotive load management where efficiency and thermal performance dominate the BOM. When designing with this device, derate power dissipation against ambient temperature using the θJA figure from the datasheet. Drive the base with sufficient base current to force saturation—roughly IC/10—and include a base-emitter resistor to guarantee fast turn-off in PWM applications. This page consolidates distributor stock, parametric comparisons, drop-in alternatives, and PCB thermal guidance not found in the bare manufacturer datasheet.
GAN063-650WSAQ - 650V 50mΩ GaN FET, TO-247-3 | Nexperia
Nexperia GAN063-650WSAQ is a 650 V, 50 mΩ Gallium Nitride (GaN) power transistor housed in a TO-247-3 through-hole package. It is qualified to AEC-Q101, combines a high-voltage GaN HEMT with a low-voltage silicon MOSFET in a cascode configuration, and is rated for 34.5 A continuous drain current (Tc) with 143 W power dissipation. What is a GaN FET? A Gallium Nitride Field-Effect Transistor is a wide-bandgap power semiconductor that switches faster and with lower switching losses than equivalent silicon MOSFETs. GaN belongs to the hypernym hierarchy: GaN FET -> wide-bandgap semiconductor -> power transistor -> discrete semiconductor. Compared with silicon superjunction MOSFETs of similar voltage class, GaN devices offer lower on-resistance per unit area, near-zero reverse-recovery charge (Qrr), and smaller output capacitance energy (Eoss), enabling smaller magnetics and higher system efficiency in hard-switched topologies. The GAN063-650WSAQ is a normally-off cascode GaN FET that integrates a low-voltage silicon MOSFET with a high-voltage GaN HEMT to deliver a standard MOSFET gate-drive experience. Key features include a 650 V drain-source blocking voltage, 50 mΩ typical on-resistance, low gate charge for fast switching transitions, and zero Qrr which eliminates body-diode reverse-recovery losses in half-bridge configurations. The TO-247-3 package provides a robust mechanical form-factor familiar to power designers and supports screw-mount thermal attachment to a heatsink. Technically, the cascode configuration means the device is driven by a standard 0-10 V or 0-12 V gate signal like a silicon MOSFET, but the drain-current conduction and blocking are performed by the GaN HEMT, giving engineers a drop-in upgrade path from silicon MOSFETs to GaN. AEC-Q101 qualification makes the part suitable for automotive-grade designs including on-board chargers and DC-DC converters for electric vehicles. Typical applications include electric vehicle on-board chargers (OBC), totem-pole PFC converters, telecom rectifier stages, industrial SMPS, solar micro-inverters, and high-density server power supplies. The combination of 650 V rating and 50 mΩ RDS(on) targets sub-3 kW power conversion stages where efficiency above 98% is required. Design consideration: drive the GAN063-650WSAQ with a totem-pole capable gate driver that can source/sink at least 1 A peak gate current, keep the gate-loop PCB inductance below 5 nH, and place a small ferrite bead or RC snubber on the source return to suppress the high dV/dt-induced ringing that GaN devices generate. The AEC-Q101 'Q' suffix also implies PPAP documentation and tighter process control than the standard-grade GAN063-650WSA.
IGC019S06S1XTMA1 - 60V GaN FET 1.3mΩ CoolGaN G3 | Infineon
The Infineon IGC019S06S1XTMA1 is a 60 V normally-off enhancement-mode CoolGaN G3 gallium-nitride power transistor with a very low on-state resistance of 1.3 mohm, rated for 27 A at 25 C ambient (99 A at Tc), housed in a compact PG-TSON-6-2 (PQFN 3x5) surface-mount package. A GaN power transistor is a wide-bandgap semiconductor switch belonging to the power transistor hierarchy: GaN HEMT -> FET -> power semiconductor -> power management. Unlike silicon MOSFETs, gallium nitride devices exhibit far lower gate charge and zero reverse-recovery loss, enabling faster switching frequencies, higher power density, and improved efficiency in medium-voltage converters. The normally-off (enhancement-mode) behavior means the device is OFF at zero gate voltage, simplifying gate-drive design and improving fail-safe behavior compared with cascode or depletion-mode GaN approaches. Key features of the IGC019S06S1XTMA1 include 1.3 mohm on-state resistance for minimal conduction loss, a 60 V drain-source rating for medium-voltage rails, current capability of 27 A at ambient and up to 99 A with adequate board cooling, and power dissipation of 3.3 W (Ta) or 45 W (Tc) depending on thermal management. Technically, the CoolGaN G3 generation from Infineon Technologies uses a lateral e-mode GaN HEMT structure optimized for high-frequency hard- and soft-switching. The PQFN 3x5 footprint keeps parasitic inductance low, which is critical because fast dv/dt and di/dt edges typical of GaN converters otherwise cause ringing and EMI. Typical applications include high-density LLC and buck converters, 48 V server and telecom power stages, USB-PD and adapter designs, and Class-D audio output stages where switching speed and low Rds(on) directly improve efficiency. Design consideration: because GaN parts have tight gate-drive requirements, keep the gate loop short and follow Infineon layout guidance; the exposed drain pad must be soldered to a generous copper pour for the 45 W (Tc) capability to be realized. This page synthesizes distributor listings, datasheet data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
IGD06N60TATMA1 - 600V 6A TRENCHSTOP IGBT3 | Infineon
The Infineon IGD06N60TATMA1 is a 600 V, 6 A hard-switching TRENCHSTOP IGBT3 discrete in a TO-252 (PG-TO252-3-11) surface-mount package, combining trench-cell and field-stop concepts to optimize both static and dynamic performance. The part delivers a collector-emitter voltage rating of 600 V, a nominal continuous collector current of 6 A, and a maximum power dissipation of 88 W, making it suitable for moderate-power switched-mode power conversion stages. An Insulated Gate Bipolar Transistor (IGBT) is a voltage-controlled bipolar power semiconductor that merges the high input impedance and fast switching of a MOSFET with the low conduction drop of a bipolar transistor. In the power-management hierarchy, IGBTs sit between MOSFETs and thyristors, bridging DC-DC converters, motor drives, and inverter topologies at voltage and current levels where MOSFET conduction losses become prohibitive. Key features of the IGD06N60TATMA1 include a TRENCHSTOP IGBT3 cell architecture with a soft-recovery emitter-controlled diode co-packaged on the same die, an integrated gate clamp structure, and low saturation voltage. The trench-cell field-stop geometry reduces both VCE(sat) and turn-off switching losses versus planar PT/NPT IGBT generations, while the soft-recovery diode minimizes reverse-recovery losses and EMI during hard-switching transitions. The device is intended for hard-switching topologies including PFC boost stages, half-bridge converters, and motor-drive inverters operating up to 600 V bus rails. In typical applications, the IGD06N60TATMA1 is used in PFC boost converters, induction-heating inverter half-bridges, washing-machine motor drives, dish-washer motor drives, refrigerator compressor drives, and air-conditioner outdoor-unit inverters. A continuous 6 A rating supports appliance-class motor power levels in the 200 W to 1500 W range. The integrated anti-parallel diode simplifies bridge designs where a body diode or external freewheeling diode would otherwise be required. When designing with this part, derate the collector current against switching frequency because switching losses scale with fsw. Provide a 15 V gate drive with respect to emitter, keep the gate-drive loop inductance below 50 nH to avoid Miller-induced turn-on, and respect the maximum junction temperature of 175 °C. The DPAK (TO-252) package requires at least 6 cm² of copper pour on the PCB tab to keep junction temperatures within safe limits.
IGI60L1414B1MXUMA1 - 600V GaN Half-Bridge 140mΩ | Infineon
The Infineon IGI60L1414B1MXUMA1 is a 600V GaN (Gallium Nitride) half-bridge power stage in a PG-TFLGA-27-2 surface-mount package, integrating two 140 mΩ RDS(on) enhancement-mode GaN switches with high-side and low-side gate drivers, level shifting, and an ultra-fast low-resistance bootstrap diode. The device supports up to 6.0A continuous drain current and features application-configurable turn-on and turn-off speed with source/sink drive currents of +0.29 A / -0.7 A respectively, enabling designers to balance switching loss against EMI in hard-switched topologies operating at high dv/dt. A GaN half-bridge power stage is an integrated module that combines two gallium-nitride power transistors configured in a half-bridge (high-side + low-side) topology along with their dedicated gate drive circuitry. Gallium nitride, a wide-bandgap semiconductor, offers fundamentally higher electron mobility, lower output capacitance, and zero reverse-recovery charge compared to legacy silicon MOSFETs, allowing switching frequencies 5-10x higher with substantially reduced switching losses. GaN power stages belong to the wider hierarchy: GaN transistor → power semiconductor → discrete semiconductor → power management. By integrating the gate driver and bootstrap diode on the same die/substrate, the IGI60L1414B1M family eliminates the parasitic inductance that would otherwise limit switching performance in a discrete GaN + external driver design. Key specifications include 600V drain-source blocking voltage, 140 mΩ on-resistance per switch, integrated bootstrap diode, application-configurable turn-on/turn-off resistors, and built-in under-voltage lockout. The PG-TFLGA-27-2 package provides a low-inductance land-grid-array footprint with an exposed thermal pad for direct PCB cooling. The integration of the high-voltage level shifter and the low-side driver into a single package dramatically reduces the loop inductance between gate drive and power loop, which is critical for containing GaN switching transients. Typical applications include switched-mode power supplies (SMPS), totem-pole bridgeless PFC stages, LLC and phase-shifted full-bridge converters, motor drive inverters, and Class-D audio amplifiers. The configurable gate drive strength allows optimization for different switching frequencies (typically 100 kHz to 1 MHz) and load conditions. The 600V rating and integrated bootstrap make it well suited for 400V bus systems derived from rectified 230V AC mains. For optimum EMI, the designer should minimize the high-side and low-side power loop inductance by placing input ceramic bypass capacitors directly beneath the exposed pad and using a thin dielectric PCB stack-up. The bootstrap capacitor value should follow the sizing guidance from the datasheet, which cross-references the Infineon 2ED2101S06F standalone driver application note for the calculation methodology. Always consult the manufacturer datasheet for the absolute maximum drain-source voltage derating under switching transients and inductive load conditions. This page synthesizes distributor pricing, datasheet specifications, and drop-in alternatives that are not aggregated on the manufacturer product page, providing an engineering-focused view of the IGI60L1414B1MXUMA1 for power-electronics designers.
IKW50N65H5FKSA1 - 650V 50A IGBT Single | Infineon TO-247
The Infineon IKW50N65H5FKSA1 is a high-speed TRENCHSTOP 5 IGBT single transistor rated at 650 V collector-emitter voltage, 80 A continuous collector current, and 305 W maximum power dissipation, housed in a TO-247 (PG-TO247-3) through-hole package. It belongs to the H5 high-speed switching family optimized for hard-switching topologies where low VCE(sat) and fast fall times coexist. An IGBT (Insulated-Gate Bipolar Transistor) is a three-terminal power semiconductor that combines the high input impedance of a MOSFET gate with the low conduction losses of a bipolar transistor, sitting in the power-semiconductor hierarchy between MOSFETs (lower power, faster) and thyristors (higher current, slower). The IKW50N65H5FKSA1 targets hard-switched PFC, inverter, and welding-converter stages where 650 V breakdown voltage and 50 A nominal current define the typical 5-15 kW power-class envelope. Key features include a collector-emitter saturation voltage VCE(sat) of 1.65 V at IC = 50 A (per the LCSC listing and FindIC summary), a built-in anti-parallel diode for half-bridge and full-bridge use, and low switching losses suitable for 20-50 kHz hard-switched converters. The trench-gate TRENCHSTOP 5 cell technology reduces conduction losses versus planar NPT predecessors, while the co-packaged diode is optimized for low Qrr and soft recovery to limit reverse-recovery losses in bridge configurations. Typical applications span solar inverters, industrial motor controllers, UPS systems, induction heating, and welding converters. The wide 650 V rating provides adequate derating margin for 400 V rectified-mains and PFC boost stages, while the 50 A continuous current supports three-phase motor drives up to roughly 15 kW without paralleling. The TO-247 package offers low thermal resistance and screw-mount compatibility for heatsink attachment. Design with VGE = 15 V for full rated current and use a gate resistor of 10-47 ohm to control di/dt. Ensure junction temperature stays below 175 C with adequate heatsinking. This page synthesizes distributor pricing, TO-247 drop-in alternatives, and practical thermal design notes not found in the manufacturer datasheet alone.
IT - Invalid/Undefined MPN | [DATA_NEEDED: Manufacturer] | Component Verification Required
The MPN "IT" returned by the search query does not correspond to a specific, verifiable electronic component. According to the Verified Web Data retrieved on 2026-10-09, the search results returned generic IT-services price aggregators (itprice.com, techreviewer.co), Cisco/HP enterprise hardware price lists, and general electronic-component datasheet portals (DigiKey, Mouser, EETech, ALLDATASHEET, Datasheets360), with no datasheet, parametric data, or manufacturer association tied to "IT" as a part number. What is an MPN? A Manufacturer Part Number (MPN) is the unique alphanumeric identifier that a semiconductor or component vendor assigns to a specific product. An MPN encodes the product family, key parameters, package code, and qualification grade (e.g., TPS7A4701RGWR = TI, LDO family, 4701 variant, RGW = VQFN-20 package, R = tape-and-reel). Without a valid MPN, no datasheet, drop-in alternative, or distributor pricing can be sourced. Key facts: MPN "IT" has no identified manufacturer, no package code, no parametric specifications, and no cross-reference in the Alternatives Cross-Reference Data. The web search returned only generic IT-pricing tools and datasheet-portal homepages - these are NOT component data sources. This page is published as a placeholder so that engineers searching for "IT" see a clear explanation rather than a fabricated product. Typical validation steps when an MPN is ambiguous: (1) check for typos (e.g., "IT" vs "IR" - International Rectifier; vs "IF" - IFX; vs "IC" - generic IC prefix); (2) confirm the manufacturer prefix; (3) search the exact full MPN on the manufacturer product page; (4) if the MPN is a partial string, supply the full string (family + suffix + package code). Common manufacturer prefixes include TPS (Texas Instruments), STM (STMicroelectronics), LTC (Analog Devices), MAX (Maxim), PIC (Microchip), AT (Microchip/Atmel), LM (TI/onsemi). Design consideration: never substitute a placeholder or guessed MPN into a BOM. Unverified part numbers cause PCB rework, regulatory non-compliance, and supply-chain risk. Always validate the MPN against the manufacturer's official product page or authorized distributor (DigiKey, Mouser, Arrow, Avnet) before design-in. This page is a verification placeholder. XAIPART requires a valid manufacturer prefix + part family + package code to generate a complete product page with specifications, pricing, drop-in alternatives, and design notes.
LSK170A - Low Noise N-Channel JFET, 40V | Linear Systems
The Linear Integrated Systems (Linear Systems) LSK170A is a single, low-noise, low-capacitance, high input impedance N-channel JFET amplifier rated at 40 V drain-source voltage, 10 mA maximum drain current and 400 mW power dissipation, supplied in a 3-pin SOT-23 surface-mount package with RoHS-compliant plating. The LSK170A grade offers an IDSS range of 2.6 mA to 6.5 mA (VDS = 10 V). A JFET (junction field-effect transistor) is a voltage-controlled semiconductor in which the gate-source junction is reverse-biased, giving an extremely high input impedance and very low input gate current. Within the hierarchy of discrete semiconductors, the JFET sits under transistors alongside MOSFETs and BJTs, and is favored at the front end of amplifiers where source impedance is high and noise must be minimal. The LSK170 family was created as a direct, pin-for-pin replacement for the discontinued Toshiba 2SK170, one of the most celebrated audio JFETs ever made. Key features include an exceptionally low input-referred noise density suited to ultra-low-noise audio and acoustic applications, low junction capacitance for wide bandwidth in high-impedance nodes, high BVDSS (40 V) for maximum linear headroom in amplifiers handling high transient program content, and a uniquely linear VGS transfer function that supports low distortion and stability. The series is also an improved functional replacement for the Interfet IF1320, IF1330, IF1331, and IF4500. Architecturally, the device uses a single N-channel junction structure optimized for transconductance linearity rather than raw speed, which is exactly what low-noise voltage-gain stages and source followers require. Grade selection (A through D) sorts IDSS into tight bins, allowing designers to choose the operating-current window that best matches their bias point without external trimming. Typical applications include microphone preamplifier and phono-stage front ends, acoustic and instrumentation sensor buffers, medical and sensor front ends, and precision active filters where high input impedance, low noise, and low capacitance dominate the design. A key design consideration: because IDSS varies by grade (2.6-6.5 mA for grade A), source degeneration or current-source biasing is recommended, and for matched differential pairs, factory-matched LSK170/LSJ74 pairs should be specified. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
MJ2955 - 15A 60V PNP Power Transistor | TO-3 | onsemi
The onsemi MJ2955 is a complementary silicon PNP power transistor housed in a hermetically sealed TO-3 metal case, designed for general-purpose switching and amplifier applications. It delivers 15 A continuous collector current, supports a 60 V collector-emitter breakdown voltage, and dissipates 115 W at 25 °C case temperature, paired with a low junction-to-case thermal resistance of 1.52 °C/W. As the PNP complement to the legendary 2N3055 NPN transistor, the MJ2955 shares the same TO-3 (TO-204-3) footprint and pinout, enabling direct complementary pairing in push-pull output stages. A bipolar junction transistor (BJT) is a three-terminal semiconductor device that uses a small base current to control a much larger collector current, achieving current gain typically expressed as hFE. Power BJTs like the MJ2955 are optimized for high-current and high-voltage switching or linear amplification, where their low saturation voltage and robust SOA are advantageous. Within the power semiconductor hierarchy, the MJ2955 sits as a PNP power BJT, complementary to NPN power BJTs such as the 2N3055, and is typically deployed where polarity-symmetric drive or negative-rail regulation is required. Key features include 60 V VCBO, 7 A continuous base current, an epitaxial-base planar die for tight parametric distribution, and hermetic TO-3 metal packaging rated for chassis-mount heatsink attachment. The TO-3 case provides low thermal resistance, high mechanical ruggedness, and a bolt-down mounting style that suits industrial, audio, and military-grade applications where long-term reliability is critical. The MJ2955 uses an epitaxial-base mesa structure delivering typical DC current gain (hFE) of 20 to 70 at IC = 4 A, supporting both linear amplification and saturated switching. Its collector-emitter saturation voltage of approximately 1.1 V at rated current makes it efficient in linear regulators and audio output stages, while the 4 MHz transition frequency supports moderate-bandwidth amplifier designs. Typical applications include linear power supplies and series regulators, hi-fi audio amplifier output stages, DC motor drivers, inverter and converter stages, and general-purpose high-power switching. The MJ2955's complementary nature to the 2N3055 makes it a standard choice for push-pull Class AB amplifier output pairs. When designing with this device, always use a proper mica or silicone-insulated heatsink mount and ensure the collector case potential is acceptable for your circuit topology, since the TO-3 case is electrically tied to the collector. Keep base drive current within the rated 7 A limit and observe the SOAR curve at high VCE. This page synthesizes distributor pricing, drop-in TO-3 alternatives, and practical heatsink design notes not consolidated on the manufacturer datasheet, giving procurement and design engineers a single reference for sourcing and substituting the MJ2955.
MMBT3904 - 40V NPN Small-Signal Transistor, 200mA | Multi-Source
The MMBT3904 is a 40 V NPN silicon bipolar junction transistor (BJT) in a 3-pin SOT-23 surface-mount package, rated for 200 mA continuous collector current and a 300 MHz transition frequency. It is offered as a generic industry-standard part number by multiple manufacturers including onsemi, Nexperia, Diodes Incorporated, and Fairchild Semiconductor, with each vendor publishing equivalent or near-equivalent specifications under the same MMBT3904 marking. A small-signal BJT is a type of bipolar transistor optimized for low-current amplification and switching rather than power delivery. In the semiconductor taxonomy, the MMBT3904 sits under: BJT -> bipolar transistor -> discrete semiconductor. It functions as the NPN complement to the MMBT3906 (PNP) and is the surface-mount counterpart to the through-hole 2N3904, sharing the same die-level electrical targets but in a smaller SOT-23 footprint. Key features include a 40 V collector-emitter breakdown (VCEO), 60 V collector-base breakdown (VCBO), a DC current gain (hFE) range of 100 to 300 at 10 mA, and a power dissipation of approximately 200 to 350 mW depending on board layout. The epitaxial planar die construction provides tight parametric distribution and the complementary MMBT3906 PNP enables push-pull output stages. Most datasheet revisions are lead-free, fully RoHS compliant, and several are AEC-Q101 qualified for automotive use. Architecturally, the device is designed as a general-purpose amplifier and switch, with a useful dynamic range extending to 100 mA as a switch and 100 MHz as an amplifier. The SOT-23 package occupies roughly 6 mm² of board area and is the de-facto industry standard for low-power SMD transistors. Typical applications include general-purpose switching circuits, signal amplification, interface logic level shifting, oscillator building blocks, driver stages for LEDs and small relays, and complementary push-pull pairs in audio output stages. Designers should select it whenever a low-cost, widely second-sourced NPN transistor is needed for non-critical analog or digital switching tasks. When designing with the MMBT3904, observe the maximum collector dissipation (typically 200 mW on a minimal pad, up to 350 mW with the JEDEC 1 oz copper test board of 15 mm x 15 mm). For switching applications, include a base drive resistor to control saturation and improve turn-off time.
MMBT3904,215 - 40V NPN Switching Transistor | Nexperia SOT-23
The Nexperia MMBT3904,215 is a 40 V NPN small-signal switching transistor housed in a SOT-23 (TO-236AB) surface-mount package, rated for 200 mA continuous collector current, 300 MHz transition frequency, and 250 mW power dissipation. As the SMD counterpart of the legacy 2N3904 TO-92 part, it has become the industry-standard NPN general-purpose BJT for compact, high-volume designs. The device is qualified to Nexperia's automotive-grade process flow and is widely second-sourced across multiple silicon vendors. A bipolar junction transistor (BJT) is a three-terminal semiconductor device in which a small base current controls a much larger collector current, enabling amplification and switching functions. The NPN variant draws electrons from emitter to collector, with the base-emitter junction forward biased and the base-collector junction reverse biased in the active region. In the broader taxonomy, the BJT sits below the power-management hierarchy as a discrete semiconductor alongside MOSFETs, IGBTs, and Darlingtons, while the SOT-23 package belongs to the small-outline surface-mount family used when board area is constrained. Key specifications of the MMBT3904,215 include a collector-emitter breakdown voltage (VCEO) of 40 V, collector-base voltage (VCBO) of 60 V, emitter-base voltage (VEBO) of 6 V, DC current gain (hFE) between 100 and 300 at 10 mA, and a noise figure below 5 dB. The three-pin SOT-23 footprint enables fully automated assembly, while the 300 MHz transition frequency (fT) supports switching speeds into the low-nanosecond range and RF amplifier designs up to UHF. Architecturally, the MMBT3904 uses an epitaxial planar NPN structure with gold-doped die attach for long-term stability and is complementary to the PNP MMBT3906 in the same package. Its high gain-bandwidth product and low saturation voltage (around 200 mV at 10 mA) make it equally suitable for linear amplification and saturated switching service. Typical applications include inverter and interface circuits, general-purpose switching in portable and battery-powered devices, DC-DC converter driver stages, sensor signal conditioning, and low-power audio pre-amplifiers. The SOT-23 footprint is compatible with high-density PCB layouts where a TO-92 2N3904 would be impractical. Designers should observe the 250 mW power-dissipation limit at 25 °C, derate to zero at 150 °C, and ensure base current stays within the safe operating area to prevent thermal runaway. For high-volume production, the wide cross-vendor second-source availability of MMBT3904 parts provides strong supply-chain resilience. This page synthesizes distributor pricing, drop-in second-source alternatives from verified cross-reference data, and practical design notes not consolidated in the manufacturer datasheet alone, supporting both component engineers and procurement specialists.
MMBT3904-7-F - 40V NPN Small Signal BJT 200mA SOT-23 | Diodes Inc
The Diodes Incorporated MMBT3904-7-F is a 40 V NPN small-signal bipolar junction transistor (BJT) delivering 200 mA continuous collector current and a 300 MHz transition frequency in a 3-pin SOT-23 surface-mount package. It is the surface-mount counterpart to the legacy 2N3904 through-hole transistor and is widely used as a general-purpose amplifier and low-power switch. A bipolar junction transistor is a three-terminal semiconductor device in which a small base current controls a larger collector current; NPN BJTs use a p-type base sandwiched between two n-type regions, allowing electrons (rather than holes) to be the primary charge carrier, which gives NPN devices superior high-frequency performance for most analog switching and amplification tasks. The MMBT3904-7-F sits within the broader category hierarchy of BJT -> bipolar transistor -> discrete semiconductor, and is one of the most widely second-sourced active components in the industry. Key specifications of the MMBT3904-7-F include VCEO of 40 V, VCBO of 40 V, VEBO of 6 V, DC current gain (hFE) of 100 to 300 at 10 mA, transition frequency (fT) of 300 MHz minimum, and total power dissipation of 300 mW. The complementary PNP type is the MMBT3906-7-F from the same Diodes Incorporated family, enabling matched complementary designs. The device is fully RoHS compliant, lead-free, and halogen/antimony-free per the manufacturer datasheet. The MMBT3904-7-F uses an epitaxial planar die construction, which provides tight parametric distribution and stable DC gain across the operating temperature range of -55C to +150C. Compared to the older through-hole 2N3904, the MMBT3904-7-F integrates identical electrical characteristics into the much smaller SOT-23 footprint, enabling high-density PCB layouts while remaining a drop-in functional replacement for any circuit designed around the 2N3904. Typical applications include general-purpose switching circuits, signal amplification stages in audio and instrumentation front-ends, MOSFET gate drivers in low-power converters, level shifters between logic domains, oscillator and timer circuits, and LED driver stages. The 300 MHz fT also makes the part suitable for low-frequency RF amplification and IF stages up to a few tens of MHz. When designing with the MMBT3904-7-F, ensure that the collector current does not exceed 200 mA continuous and that power dissipation stays within the 300 mW SOT-23 limit (derate above 25C ambient). A base resistor sized to provide roughly 1/10th of the desired collector current guarantees saturation in switching applications. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single decision-ready reference for component selection and sourcing.
MMBT3904-AQ - 40V NPN BJT, 200mA, SOT-23, AEC-Q101 | Diotec
The Diotec Semiconductor MMBT3904-AQ is a 40V, 200 mA NPN small-signal bipolar junction transistor (BJT) housed in a 3-pin SOT-23 (TO-236) surface-mount package, qualified to AEC-Q101 for automotive and harsh-environment use. It delivers a transition frequency of 300 MHz, a continuous collector current of 200 mA, and a total power dissipation of 350 mW, making it suitable for general-purpose switching and amplification up to 40 V collector-emitter and 60 V collector-base ratings. A small-signal NPN BJT (bipolar junction transistor) is a three-terminal semiconductor device in which a small base current controls a much larger collector current, enabling both linear amplification and saturated switching. Within the broader component taxonomy, the MMBT3904 family sits under small-signal transistor -> BJT -> discrete semiconductor. The MMBT3904-AQ is the AEC-Q101-qualified derivative of the industry-standard MMBT3904, adding automotive-grade reliability screening, extended operating temperature range, and PPAP documentation to the classic MMBT3904 footprint and pinout. Key features include a 40 V collector-emitter breakdown voltage (VCEO), 60 V collector-base breakdown voltage (VCBO), 6 V emitter-base breakdown voltage (VEBO), 300 MHz transition frequency (fT) measured at Vce=20 V and IC=10 mA, and DC current gain (hFE) of 100 to 300. The SOT-23 (TO-236) surface-mount package supports automated assembly and reflow soldering, while the AEC-Q101 qualification makes the part eligible for automotive electronics, industrial controls, and other high-reliability applications. The device uses an epitaxial planar die construction, providing tight parametric distribution, low noise figure, and stable gain across the operating temperature range. As the NPN complement to the MMBT3906, the MMBT3904-AQ is widely used in complementary push-pull output stages, level shifters, and driver circuits for MOSFETs, IGBTs, and relay coils. The high fT and fast switching characteristics also enable RF small-signal stages and high-speed logic interface designs. Typical applications include automotive body and chassis electronics, sensor signal conditioning, MOSFET/relay drivers, DC-DC converter control loops, level shifting between logic domains, general-purpose switching circuits, and small-signal amplification in industrial and consumer designs. The combination of 40 V rating, 200 mA collector current, and AEC-Q101 qualification covers most 12 V/24 V automotive bus applications. When designing with the MMBT3904-AQ, observe the 350 mW power dissipation limit and derate appropriately at elevated ambient temperatures. Place base resistor and collector load components close to the device to minimize parasitic inductance, and verify that saturation and switching specifications are met under worst-case base drive conditions. This page synthesizes distributor pricing across three channels, plug-compatible alternatives - cross-brand variants sourced from verified cross-reference data, and practical design notes not aggregated on the manufacturer product page.
MMBT3904LT1 - 40V NPN General Purpose Transistor SOT-23
The onsemi MMBT3904LT1 is a 40 V NPN silicon bipolar junction transistor designed for linear and saturated switching applications in a 3-pin SOT-23 surface-mount package. It delivers up to 200 mA continuous collector current with a 200 mW power dissipation rating and complements the MMBT3906 PNP type in the same family. An NPN bipolar junction transistor is a three-terminal semiconductor device in which a small base current controls a much larger collector current. Within the broader semiconductor taxonomy, the MMBT3904LT1 sits at: BJT -> bipolar transistor -> discrete semiconductor -> semiconductor. NPN devices conduct when the base is biased above the emitter by approximately 0.7 V, making them the natural choice for low-side switching and for sourcing current to a load tied to a positive rail. Key features include a 40 V collector-emitter breakdown voltage (VCEO), 60 V collector-base breakdown (VCBO), 6 V emitter-base breakdown (VEBO), 200 mA continuous collector current, 300 MHz transition frequency (fT), DC current gain (hFE) of 100 to 300, and an epitaxial planar die construction. The SOT-23 (TO-236) plastic package supports a 350 mW dissipation rating on a minimum 1 inch² copper pad and operates across a -55 °C to +150 °C junction temperature range. The part uses an epitaxial planar process that yields a high gain-bandwidth product relative to its small footprint. Its low saturation voltage (VCE(sat a few hundred millivolts at moderate IC) makes it efficient as a saturated switch, while its 300 MHz fT supports general-purpose small-signal RF amplification below the VHF band. Typical applications include low-side switching of LEDs, relays, and logic-level translators, general-purpose small-signal amplification, inverter and interface circuits, and as a driver for higher-power transistors. The complementary MMBT3906 (PNP) is the natural companion for push-pull and level-shifter topologies. When designing with this device, observe the 200 mW power dissipation limit: at 200 mA collector current the allowable VCE drops to 1 V before derating begins. A minimum 0.5 inch² of copper pad area is recommended to keep the junction within safe thermal limits in continuous operation. This page synthesizes distributor pricing, drop-in SOT-23 alternatives, and practical design notes not found on the onsemi datasheet alone, with cross-brand equivalents sourced from verified catalog cross-references.
MMBT3906LT1G - 40V 200mA PNP BJT, 250MHz | onsemi
The onsemi MMBT3906LT1G is a general-purpose PNP bipolar junction transistor rated for a 40 V collector-emitter voltage, 200 mA continuous collector current, 250 MHz minimum transition frequency, and 300 mW collector dissipation in a SOT-23-3 surface-mount package. It is designed for compact switching, amplification, biasing, polarity-protection, and low-current driver circuits. A bipolar junction transistor, or BJT, is a three-terminal semiconductor device in which a small base current controls a larger collector current. A PNP transistor conducts primarily when its emitter is at a higher potential than its base, making it useful for high-side switching and current sinking. Within the discrete-semiconductor hierarchy, this part belongs to the transistor class rather than the MOSFET class. Key electrical characteristics include a maximum emitter-base voltage of 5 V, a DC current gain of approximately 100 to 300 under the cited conditions, and an operating and storage junction-temperature range of -55°C to +150°C. The -40 V polarity distinguishes this part as the PNP complement of the common 40 V NPN MMBT3904 family. Its 250 MHz transition frequency supports moderate-frequency signal and switching use, although saturation behavior and drive current must still be checked in practical designs. The SOT-23-3 package makes MMBT3906LT1G appropriate for dense PCB layouts, but its 300 mW dissipation rating imposes strict copper-area and temperature-rise considerations. Solder reflow, pad geometry, and assembly tolerances should follow the manufacturer's package guidance. The listed datasheet describes the device as Pb-free, halogen-free/BFR-free, and RoHS compliant; automotive qualification must not be inferred unless the selected ordering variant explicitly includes it. Typical applications include low-side PNP control, analog biasing, signal inversion, protection circuits, sensor interfaces, and small-signal switching. Its 40 V rating is appropriate for many 5 V, 12 V, and low-voltage industrial rails, provided transient and inductive loads remain within the device limits. Designers should use a base resistor or active driver to prevent excessive base current and should verify forced beta and worst-case temperature behavior when driving larger loads. This page synthesizes the supplied manufacturer and distributor data, identifies same-package replacement candidates, and adds practical guidance that is not normally stated as a single value in a distributor listing. Pricing, stock, and alternative status should always be rechecked because distributor availability changes over time.
MMBT4401LT1G - 40V 600mA NPN Switching Transistor SOT-23
The onsemi MMBT4401LT1G is a 40 V, 600 mA NPN silicon bipolar junction transistor (BJT) in a SOT-23-3 (TO-236) surface-mount package, designed for use in linear and switching applications. According to the onsemi datasheet for the MMBT4401LT1 family, the device delivers 250 MHz transition frequency, 300 mW power dissipation, and a 100 (min) DC current gain (hFE) at 150 mA collector current, making it suitable for general-purpose amplification and medium-speed switching. A bipolar junction transistor is a three-terminal semiconductor device that uses a small base current to control a much larger collector current, enabling amplification and switching. BJTs occupy the hypernym hierarchy bipolar transistor -> transistor -> discrete semiconductor -> semiconductor, and NPN variants such as the MMBT4401LT1G are the most common polarity used in low-voltage DC and digital-interface circuits. The 2N4401 is the through-hole legacy equivalent of this part, and the MMBT prefix designates the SOT-23 surface-mount form factor. Key features include a 40 V collector-emitter voltage (VCEO), 60 V collector-base voltage (VCBO), 6 V emitter-base voltage (VEBO), 600 mA continuous collector current, and a 200 mA saturation current rating that supports low-side load switching. The device is Pb-free, halogen-free/BFR-free, and the SMMBT4401LT1G variant carries AEC-Q101 qualification and PPAP capability for automotive applications requiring unique site and control change requirements. The MMBT4401LT1G uses an epitaxial planar NPN silicon die with self-aligned geometry that yields tight beta spread and low saturation voltage (VCE(sat) typically 0.4 V at IC=150 mA). The SOT-23 package provides a thermal resistance of approximately 625 C/W (junction to ambient on a standard 1 oz copper test board), which limits continuous dissipation but is acceptable for pulsed switching duty cycles typical of interface and driver circuits. Typical applications include low-side switching of relays, LEDs and small solenoids, level shifters between 3.3 V microcontrollers and 5 V or 12 V loads, signal inversion, interface buffers, and general-purpose DC amplification in consumer electronics. It is also commonly used as a discrete inverter in 3.3 V to 5 V logic translation circuits. When designing with this device, ensure base drive current is at least 1/10th of the desired collector current to guarantee saturation. For switching loads above 100 mA, place a flyback diode across inductive loads and respect the 300 mW continuous power dissipation limit by either derating at elevated ambient temperatures or by using pulsed operation. This page synthesizes distributor pricing, drop-in alternative MPNs in the same SOT-23 footprint, and practical design notes not found in the manufacturer datasheet, giving procurement and design engineers a single-source decision aid.
MMBT8099LT1G - 80V NPN BJT Amplifier Transistor | onsemi SOT-23
The onsemi MMBT8099LT1G is an NPN silicon bipolar junction transistor (BJT) housed in a 3-pin SOT-23-3 (TO-236) surface-mount package, designed for general-purpose small-signal amplification and switching. Key headline parameters include a collector-emitter voltage rating of 80 V (VCEO), continuous collector current of 500 mA, transition frequency of 150 MHz, and total power dissipation of 225 mW on a standard FR-5 board. An NPN BJT (bipolar junction transistor) is a three-terminal semiconductor device in which a small base current controls a much larger collector current through forward-biased base-emitter and reverse-biased base-collector junctions. BJTs sit within the broader category hierarchy of discrete semiconductors -> transistors -> bipolar transistors -> small-signal/amplifier transistors, and remain widely used where low noise, predictable gain, and high transconductance are needed at modest cost. Key features of the MMBT8099LT1G include a high VCEO of 80 V that gives substantial headroom for line-powered applications, a continuous collector current of 500 mA that is high for a SOT-23 part, and a 150 MHz transition frequency (fT) that supports RF and high-speed switching circuits. The device is Pb-free and Halogen Free/BFR Free, meeting modern environmental compliance requirements. From an architectural standpoint, the MMBT8099LT1G uses a vertical NPN epitaxial silicon process that balances voltage capability with reasonable current handling in the compact SOT-23 footprint. The device is intended as a general-purpose amplifier, so its DC current gain (hFE) is optimized across a wide collector current range, and the safe operating area reflects typical small-signal transistor limits rather than power-switching derating. Typical applications include general-purpose amplifier stages, signal switching, driver stages for relays and LEDs, RF and IF amplification to 150 MHz, and interface circuits between logic levels and higher-power loads. The high VCEO makes the part especially useful at the high side of 48 V telecom rails or in offline control signal paths. When designing with this device, observe the 225 mW dissipation limit on FR-5 boards and derate linearly above 25 C. For switching applications, base drive must supply sufficient base current to keep the device in saturation under worst-case load and temperature conditions. This page synthesizes distributor stock and pricing, validated cross-reference alternatives, and practical design notes that complement the manufacturer datasheet to support component selection and PCB layout decisions.
MMBTA06LT1G - 80V 500mA NPN BJT Driver Transistor | onsemi
The onsemi MMBTA06LT1G is an 80V, 500mA NPN silicon bipolar junction transistor (BJT) housed in a 3-pin SOT-23-3 (TO-236) surface-mount package with 100MHz transition frequency and 225mW maximum power dissipation. Designed as a general-purpose driver transistor, it offers a minimum DC current gain (hFE) of 100 at 100mA collector current and 1V VCE, making it well suited for low-power switching, amplification, and interface-driver roles. A bipolar junction transistor (BJT) is a three-terminal semiconductor device in which a small base current controls a much larger collector current through the principle of current-controlled conduction. The NPN variant conducts when the base is pulled above the emitter by roughly 0.7V. BJTs sit within the broader transistor family alongside MOSFETs and IGBTs, and within the discrete-semiconductor category above diodes, providing amplification and saturated-switching functions in millions of analog and digital designs. Key features of the MMBTA06LT1G include a VCEO rating of 80V, VCBO of 80V, and VEBO of 4V; continuous collector current of 500mA; a 100MHz current-gain bandwidth product (fT) that supports moderate-speed switching; and a maximum collector power dissipation of 225mW when properly derated across the -55C to +150C operating junction-temperature range. The Pb-free, halogen-free construction supports RoHS-compliant assemblies. The device uses a planar epitaxial silicon process and the industry-standard SOT-23 footprint, which permits direct drop-in substitution on existing PCB land patterns. The 100MHz fT and 100 hFE at 100mA place it firmly in the small-signal general-purpose category rather than high-frequency or power-switching use. Typical applications include MOSFET gate drivers, relay and solenoid drivers, interface logic level shifters, signal amplification, DC-DC converter pass elements, and LED drivers. The 80V collector rating provides substantial headroom for inductive loads such as relays and small motors. When designing with this part, ensure that average collector dissipation stays below 225mW with appropriate copper-foil area or thermal vias, and place a base series resistor to limit base current during saturated switching. For higher-current or higher-voltage alternatives, onsemi also offers the MMBTA06LT3G (same die, different reel quantity) and the SMMBTA06LT1G automotive-grade version. This page consolidates onsemi distributor pricing, drop-in alternatives, application guidance, and design notes that complement, and extend beyond, the manufacturer datasheet.
MPQ2222 - Quad NPN 40V 500mA Transistor Array | Central Semiconductor
The Central Semiconductor MPQ2222 is a quad NPN silicon transistor array containing four independent general-purpose NPN bipolar junction transistors (2N2222-type) mounted in a single 14-pin DIP (TO-116) through-hole package. Key ratings per transistor include 40 V collector-base/emitter voltage ratings, 500 mA continuous collector current, and 200 MHz transition frequency, with 650 mW total package power dissipation. A transistor array such as the MPQ2222 integrates multiple discrete BJTs into one package, sitting within the component hierarchy: NPN transistor -> bipolar junction transistor (BJT) -> transistor array -> discrete semiconductor. Arrays reduce board area, guarantee matched device characteristics from the same silicon lot, and simplify sourcing compared with four separate transistors, making them a staple of general-purpose amplifier and switching designs. The defining feature of the MPQ2222 family is true independence: all four transistors share no internal connections, so designers can freely parallel them for higher current, configure Darlington pairs, or use each device in a separate circuit section. The 200 MHz transition frequency supports RF-to-VHF small-signal amplification, while the 500 mA per-device current rating covers relay drivers, LED drivers, and medium-power switching nodes. The through-hole DIP-14 (TO-116) footprint is ideal for prototyping, breadboarding, repair, and legacy industrial equipment. Architecturally, the MPQ2222 uses diffused-junction NPN silicon planar construction identical to the industry-standard 2N2222 discrete device, so individual transistors behave exactly as a 2N2222 designer expects. The MPQ2222A suffix denotes the tighter 2N2222A-grade beta and leakage specifications. Typical applications include general-purpose amplifiers, low-side switch banks, relay and solenoid drivers, LED column drivers, oscillator and multivibrator circuits, and analog front-end gain stages in industrial and instrumentation equipment. Design consideration: total package dissipation of 650 mW is shared across all four devices; when paralleling transistors or running multiple hot devices, derate per the thermal resistance in the datasheet and verify junction temperature against the operating limit. This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing, drop-in alternatives, pinout data, and practical design notes in one place.
MPQ2222-PBFREE - Quad NPN BJT Array 40V 500mA TO-116 | Central Semiconductor
The Central Semiconductor MPQ2222-PBFREE is a quad NPN bipolar junction transistor (BJT) array integrating four general-purpose 2N2222-type NPN transistors on a single die arrangement, rated 40V collector-emitter, 500mA collector current, 200MHz transition frequency and 650mW per package, housed in a 14-pin TO-116 through-hole plastic DIP package with lead-free, halogen-free PBFREE construction. A BJT transistor array is an integrated circuit that places multiple discrete transistors, matched in process and die temperature, into one package. Within the power-management and discrete-semiconductor hierarchy, the array sits between single transistors (2N2222A) and fully integrated driver ICs, offering tighter thermal tracking and board-area savings while retaining the full design flexibility of bare BJTs for amplifier and switch stages. Key features include four matched NPN transistors that replace four individual TO-92 2N2222 parts, a 200MHz fT that supports video-frequency and high-speed switching applications, and a 40V/500mA rating per element suitable for 24V industrial logic-level load switching. The PBFREE suffix guarantees lead-free RoHS-compatible construction for modern assembly processes without sacrificing the classic 2N2222A gain characteristics. Technically, the device uses monolithic silicon bipolar construction so all four transistors share nearly identical junction temperature, reducing thermal mismatch in current-mirror, differential-pair, and Darlington configurations. The through-hole TO-116 package offers robust mechanical mounting, easy prototyping on breadboards and 0.1-inch-pitch DIP footprints, and superior power dissipation compared with small SMD arrays. Typical applications include general-purpose amplifier stages, low-side switch banks for relays and LEDs, oscillator and multivibrator circuits, and industrial control signal conditioning where four matched NPN switches are needed on a single footprint. Design consideration: total package dissipation is 650mW, so derate per-transistor current when driving multiple elements simultaneously. This page synthesizes distributor pricing, drop-in alternatives, pinout and design guidance not found on distributor listing pages.
MPQ2222-TIN-LEAD - Quad NPN 40V 500mA BJT Array | Central Semiconductor
The Central Semiconductor MPQ2222-TIN-LEAD is a quad NPN silicon bipolar junction transistor (BJT) array housing four independent general-purpose NPN transistors in a 14-pin through-hole DIP (TO-116) package, rated 40V VCEO, 500mA collector current, 200MHz transition frequency, and 650mW power dissipation, with tin/lead plating. A transistor array such as this integrates multiple discrete BJTs on a single die within one package. In the component hierarchy, it belongs to: quad transistor array -> BJT transistor array -> bipolar transistor -> discrete semiconductor. Arrays reduce board area, part count, and placement cost compared with four individual 2N2222-type transistors, while guaranteeing matched electrical characteristics among the four elements. Key features include 60V VCBO collector-base breakdown, 5.0V VEBO emitter-base breakdown, four fully independent transistors for flexible circuit topologies, and a 200MHz ft that suits both amplifier and fast-switching duties. The through-hole DIP package simplifies prototyping, breadboarding, and rework on legacy industrial boards. Architecturally, the MPQ2222 is Central Semiconductor's drop-in continuation of the industry-standard Motorola MPQ2222 quad 2N2222-equivalent, preserving the classic pin configuration (collector Q1 on pin 1 through collector Q4 on pin 14) so existing PCB footprints remain valid. Devices are manufactured with EMC GREEN halogen-free molding compound and offered in both tin/lead and lead-free (PB FREE) plating options to support legacy-repair and RoHS-constrained designs respectively. Typical applications include general-purpose amplifier stages, low-side switching arrays, LED and relay drivers, pulse generators, and repair/maintenance of legacy industrial and test equipment that originally specified the Motorola MPQ2222. Design consideration: at the 500mA maximum collector current, ensure per-device power dissipation stays within the 650mW rating and provide adequate copper-free airflow for the DIP package. This page synthesizes verified distributor data, the manufacturer datasheet pinout, and drop-in alternative guidance not consolidated in the manufacturer datasheet.
MPQ2222A - Quad NPN 40V 500mA Transistor Array | Central Semiconductor
The Central Semiconductor MPQ2222A is a quad NPN silicon bipolar junction transistor (BJT) array containing four independent general-purpose NPN transistors matched to the 2N2222A specification, housed in a 14-pin through-hole DIP (TO-116) package. Each transistor is rated for 40V collector-emitter voltage (VCEO), 75V collector-base voltage (VCBO), 6.0V emitter-base voltage (VEBO), and 500mA continuous collector current, with 650mW power dissipation per package. A transistor array such as the MPQ2222A integrates multiple discrete BJTs into a single package, reducing board space, component count, and assembly cost. Arrays sit within the semiconductor hierarchy of discrete semiconductors -> bipolar transistors -> transistor arrays, and are a staple of through-hole general-purpose amplifier and switching designs. Key features include four electrically independent NPN transistors, guaranteed 2N2222A-equivalent parameters (a JEDEC-registered industry-standard transistor type), and a DIP-14 footprint compatible with standard 0.1-inch pitch prototyping boards and sockets. The PBFREE suffix indicates lead-free construction, and the through-hole package simplifies hand soldering, prototyping, and rework. Each transistor in the MPQ2222A shares the same silicon process, so matched electrical characteristics across the four devices improve thermal tracking in push-pull and differential configurations compared with four separate discrete transistors. The 200MHz transition frequency range typical of the 2N2222A class supports fast switching and RF applications up to the VHF region. Typical applications include general purpose amplifiers, logic-level switching, LED and relay drivers, and mixed-signal prototyping where multiple NPN transistors are required. Designers should note that total package dissipation is shared across all four devices, so per-transistor power must be budgeted accordingly. This page synthesizes distributor data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
MRF426 - 25W NPN RF Power Transistor | MACOM | 1.5-30MHz
MACOM Technology Solutions MRF426 is an NPN bipolar silicon RF power transistor designed for high-gain driver and output stages in 1.5–30 MHz HF/SSB equipment. The device provides 25 W PEP output power, 22 dB minimum gain, and 35% efficiency at the characterized 28 V, 30 MHz operating condition. It is supplied in a ceramic flange-mount package identified as CASE211-07, STYLE 1. An RF bipolar power transistor is a semiconductor device optimized to amplify or generate high-frequency RF power. Unlike a general-purpose transistor, its junction layout, package construction, thermal path, and RF impedance are tailored for RF operation. Within the power-semiconductor hierarchy, the MRF426 is a silicon NPN RF power transistor intended for transmitter or amplifier stages operating in the shortwave and HF bands. Key features include a 35 V collector-emitter voltage rating, 3 A collector current capability, 25 W PEP output power, 22 dB minimum gain, and 35% efficiency. The characterized frequency range extends from 2 MHz minimum to 30 MHz maximum in the manufacturer product specifications, while the device is described for 1.5–30 MHz HF/SSB applications. Intermodulation distortion is specified at 30 dB maximum at 25 W PEP under the characterized test condition. The MRF426 uses a ceramic flange package with a chassis-mount configuration. Its construction supports RF power handling while requiring careful thermal design at the flange and PCB interface. The device is a bipolar NPN transistor, and its datasheet identifies it as 100% tested for the stated RF performance. S-parameter information is available through the manufacturer technical resources. Typical applications include HF radio transmitters, single-sideband transmitters, linear RF amplifiers, driver stages, and output stages in communication equipment operating within the 1.5–30 MHz range. It is most appropriate where the design requires a dedicated RF power transistor rather than a low-frequency switching transistor. For reliable operation, the RF amplifier layout should provide controlled impedance, short return paths, adequate input and output matching, and a low-inductance thermal connection to the flange. Biasing and drive must remain within the manufacturer’s absolute maximum and characterized conditions. Verify package pinout, thermal requirements, and operating limits against the current MACOM datasheet before finalizing a new design. This page consolidates manufacturer specifications, distributor references, verified equivalent-part information, and application-oriented design guidance for engineers evaluating the MRF426 in HF/SSB RF power systems.