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製品 (91)
LTC4418CUF#PBF - Dual Priority PowerPath Controller, 40V | ADI
The Analog Devices LTC4418CUF#PBF is a dual-channel prioritized PowerPath controller that connects one of two valid DC power supplies to a common load based on user-defined priority and input validity, housed in a 20-lead 4x4 mm QFN (UF) package. It operates over a 2.5 V to 40 V input range, draws only 26 µA quiescent current, and provides ±1.5 % overvoltage/undervoltage window accuracy for clean switchover between rails. An ORing controller, also known as a PowerPath controller or ideal-diode controller, is a power management IC that uses external P-channel MOSFETs to emulate a low-loss diode between two supplies. It allows redundant or prioritized power sources to share a load without the typical diode forward drop, falling within the broader category of power management ICs and system-level supervisors. The LTC4418 implements two fully independent channels with priority set by pin assignment, giving designers a compact alternative to discrete Schottky ORing solutions. Key features include fast non-overlap switchover that prevents reverse and cross conduction while minimizing output droop, a 6 V gate clamp that protects downstream MOSFETs, and a controlled soft-start that limits inrush current on connection. Open-drain VALID outputs indicate each input has remained within its OV/UV window for the configured validation period, simplifying digital handshake with downstream microcontrollers and PMUs. The combination of wide VIN, low Iq, and small QFN-20 footprint makes the LTC4418 ideal for space-constrained redundant systems. Architecturally, the device combines precision voltage references, comparators, and charge-pump-driven gate drivers for both channels on a single die, achieving parametric parity with larger two-chip solutions. Designers can adjust OV/UV thresholds with simple resistor dividers and program validation time with a single capacitor, retaining design flexibility without external firmware. Typical applications include battery-backed wireless sensor nodes, industrial sensor and PLC backup power systems, asset trackers, and e-call/telematics units that must hand over cleanly from primary supply to backup battery without MCU involvement. The 40 V tolerance also suits 24 V industrial bus systems and solar-charge ORing topologies. When designing, place gate resistors close to the IC and keep source-sense traces short to avoid oscillations; verify the external P-FET body-diode avalanche rating EAS for any unclamped inductive disconnect event. This page consolidates distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
MAX14701EWC+ - 5.9V OVP Protector with Surge | Maxim Integrated
The Maxim Integrated MAX14701EWC+ is a high-accuracy overvoltage protector (OVP) with integrated surge protection housed in a 12-pin WLP package. It features a 5.915V fixed overvoltage threshold, ultra-fast response time, and integrated TVS surge protection up to ±100V, making it a complete front-end protection IC for USB-C, PD, and 5V rails. An OVP (overvoltage protector) is a type of power management IC that sits between an upstream power source and a downstream load, disconnecting the path when the input voltage exceeds a programmed threshold. OVP ICs sit inside the broader protection IC family (OVP, OCP, OTP, reverse-polarity) and are critical for systems that must survive faulty adapters, hot-plug transients, and inductive load transients on their power inputs. Key features include ±1% accurate overvoltage trip threshold, ultra-low on-resistance internal MOSFET, integrated back-to-back TVS for surge robustness, and minimal quiescent current. The MAX14701EWC+ is specifically designed for systems that need to survive non-compliant USB Type-C adapters and 5V rails where accidental application of high voltage could damage downstream components. Typical applications include USB Type-C/PD port protection, smartphones and tablets, IoT devices powered from 5V adapters, and any system that must survive up to 28V on a 5V rail. The 12-pin WLP package allows compact placement near the input connector. When designing with this part, place the device as close to the input connector as possible to maximize surge clamping effectiveness. The integrated TVS reduces external component count compared to discrete FET + TVS solutions.
MAX14701EWC+T - 5.915V OVP Protector w/ Surge | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX14701EWC+T is a fast-response, high-accuracy overvoltage (OVP) protector with integrated surge protection in a 12-bump WLP (WLCSP) package. The device clamps VOUT to a factory-set 5.915V threshold when VIN exceeds the threshold, and includes TVS-style surge protection on the input to survive transients typical of USB Type-C, BC1.2, and similar hot-plug ports. An OVP (overvoltage protector) is a power-path protection IC placed between an upstream supply (charger, USB VBUS, external adapter) and a downstream load (PMIC, SoC, battery). Its role is to disconnect or clamp the rail when the input voltage rises above a safe limit, preventing damage to sensitive downstream silicon. OVP protectors sit in the power management hierarchy below TVS diodes (which absorb the energy) and above PMIC input stages (which assume safe input voltage). Fast OVP response (sub-microsecond turn-off) is critical when protecting processors rated only to 5V from mis-wired 12V or 20V USB-PD adapters. Key features include a 5.915V factory-trimmed overvoltage threshold with ±0.5 percent accuracy, sub-microsecond OVP response time, internal 100 mA to 1 A current-limit switch, and built-in surge protection rated for IEC 61000-4-5 (8 kV contact / 15 kV air ESD-style transients). The device operates from a wide 2.4V to 5.5V supply range while monitoring higher-voltage input transients, and provides an open-drain FLAG output to indicate OVP events. The WLP-12 (1.5 mm x 1.8 mm wafer-level package) is approximately 80 percent smaller than SOT-23-6 alternatives, enabling compact mobile and wearable designs. The MAX14701 uses a back-to-back MOSFET architecture with an integrated charge pump for gate drive, achieving low on-resistance and clean turn-off during overvoltage events. Internal blanking timers prevent false trips on capacitive load transients during hot-attach. Typical applications include smartphone and wearable charging path protection, USB Type-C VBUS protection, tablet and ultrabook input protection, Bluetooth and TWS earbud overvoltage protection, IoT sensor node power path, and any 5V rail exposed to user-replaceable cables or adapters. For higher voltage rails (12V / 20V USB-PD), consider the MAX14702 (13.95V threshold) or MAX14703 (23.05V threshold) in the same WLP-12 footprint. Design tip: place the MAX14701EWC+T within 10 mm of the input connector so the internal TVS clamp can absorb surge energy before it propagates downstream; place a 1 uF ceramic bypass cap on VOUT. This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, including a parameter-by-parameter comparison and BOM-friendly recommended companion parts.
MAX16016LTBS+T - Low-Power μP Supervisor with Battery Backup | Maxim Integrated
The Maxim Integrated MAX16016LTBS+T is a low-power microprocessor supervisory circuit that monitors power supplies, provides battery-backup control, and chip-enable (CE) gating for memory write protection in microprocessor-based systems, housed in a 10-pin TDFN (3x3 mm) package with an exposed pad. The device operates over the industrial temperature range of -40°C to +85°C and integrates multiple supervisory functions in a single IC to improve system reliability in space-constrained designs. A microprocessor supervisory circuit (also called a voltage supervisor, reset IC, or power monitor) is a dedicated IC that watches one or more system supply rails and asserts a reset signal whenever the rail falls outside a valid window. It sits between the power supply and the host MCU or CPU as part of the broader power management hierarchy (supervisor -> power monitor -> power management IC -> mixed-signal semiconductor), providing deterministic boot behavior, brownout protection, and orderly recovery from power-loss events that a generic voltage regulator cannot guarantee. Key features include a single supervisor channel with push-pull, totem-pole reset output, an integrated battery-backup switchover path, chip-enable gating for SRAM/EPROM write protection, and a nominal supply monitor threshold of 1.62 V. The compact 10-pin TDFN package measures only 3 mm × 3 mm with a maximum seated height of 0.8 mm, making the part suitable for handheld, portable, and densely populated industrial boards where board area is at a premium. Internally, the MAX16016 family uses a precision bandgap reference and comparator chain to detect undervoltage conditions, combined with a low-on-resistance MOSFET for transparent battery-backup switching. The chip-enable gating logic prevents spurious write cycles to external memory during power transitions, which is critical for deterministic firmware behavior in 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5 V logic systems. Compared with discrete reset solutions, the MAX16016 reduces external component count, simplifies PCB layout, and improves long-term reliability. Typical applications include supervisory control in portable battery-backed equipment, point-of-sale terminals, industrial controllers, and any μP system that requires power-on reset (POR), brownout reset, battery switchover, and memory write protection. The part is particularly suited to designs that must retain SRAM contents through primary power loss. When designing with the MAX16016LTBS+T, place the decoupling capacitor (per datasheet typical application) as close as possible to the VCC pin and verify the exposed pad is soldered to a sufficient copper pour for thermal and electrical performance. Carefully review the battery-backup current path and confirm the backup supply voltage is within the device's specified range to ensure proper switchover behavior. This page synthesizes distributor pricing, drop-in supervisor alternatives from the same product family, and practical design notes for portable and battery-backed systems - content that complements rather than duplicates the manufacturer datasheet.
MAX16088XS44F+T - 1.2V Voltage Supervisor, SC70-4 | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX16088XS44F+T is an ultra-low-power, single-channel voltage supervisor (reset IC) featuring a factory-trimmed 4.375V threshold in a 4-pin SC70 package. Designed to monitor microprocessor (µP) and ASIC supply rails, this supervisor asserts a reset signal whenever the monitored VCC falls below the threshold, holding it asserted for a minimum timeout period after VCC recovers - preventing code-execution errors during brownouts, power-up, and power-down events. A voltage supervisor is a type of power management integrated circuit (PMIC) that belongs to the supervisors-and-reset IC category. Within the broader system hierarchy, supervisors fall under power management ICs - semiconductors that regulate, monitor, and protect voltage rails. Supervisors specifically ensure deterministic processor behavior by forcing a known reset state whenever the supply rail becomes unreliable. This is critical for embedded systems where uncontrolled code execution during brownouts can corrupt flash memory, registers, or cause mechanical/communications faults. Key features of the MAX16088XS44F+T include a 4.375V ±1.5% threshold accuracy, an open-drain active-low RESET output, an ultra-low 0.7 µA (typical) supply current that makes it ideal for battery-powered applications, and a 200 ms minimum reset timeout. The SC70-4 package occupies only ~2.0 mm × 2.1 mm of PCB area - one of the smallest footprints in the supervisor category - and operates over a -40°C to +85°C extended industrial temperature range. The wide VCC supply range of 1.0V to 5.5V allows monitoring of common 3.3V, 3.0V, 2.5V, 1.8V, and 1.2V rails from the same part. Architecturally, the MAX16088XS44F+T uses a precision bandgap reference and comparator core to compare VCC against the trimmed threshold, combined with an internal timing generator for the reset pulse-width. The design avoids the need for an external timing capacitor - unlike many legacy supervisors such as the MAX809 - by integrating a fixed-factory timeout. Typical applications include battery-powered IoT sensor nodes, wearable health monitors, portable consumer electronics, MCU/SoC rail monitoring, energy harvesting nodes, and industrial sensor endpoints. The low quiescent current (0.7 µA typ.) makes it especially suitable where sleep-mode drain dominates system budgets. Designers should choose a pull-up resistor on RESET (open-drain) sized appropriately for the load capacitance to meet reset rise-time requirements, and verify that VCC ramp time is faster than the device's minimum VCC slew specification. For more margin, consider the MAX16087 variant family with adjustable thresholds. This page synthesizes distributor pricing, cross-brand substitutes, application notes, and design guidance for the MAX16088XS44F+T - information typically scattered across multiple datasheets and distributor pages.
MAX17525ATP+ - 60V Adjustable Power Limiter | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX17525ATP+ is a high-accuracy, adjustable overvoltage, undervoltage, and overcurrent protection IC housed in a 20-pin TQFN (5x5 mm) package. It operates from a 5.5 V to 60 V input supply, draws 1.4 mA of quiescent supply current, and supports operating temperatures from -40 C to +125 C, making it suitable for industrial, automotive, and telecom systems exposed to wide input transients. A power limiter, also called an adjustable overcurrent/overvoltage protector, is a category of power management IC that guards downstream circuitry by interrupting or limiting current flow during fault events such as input overvoltage, reverse polarity, or excessive load current. The MAX17525 belongs to the Olympus protection family, sits within the broader hierarchy of supervisors/reset & protection ICs -> power management -> semiconductor, and integrates three independent protection thresholds in a single chip that historically required multiple discrete comparators and MOSFETs. Key features include internal overvoltage (OV) and undervoltage (UV) comparators with adjustable thresholds, an accurate current-limit comparator for use with an optional external p-channel MOSFET, reverse-voltage blocking with the same pMOSFET, and a FLAG output that asserts when any protection event occurs. The 20-pin TQFN package provides a small footprint for space-constrained boards while offering a thermal pad to dissipate heat during sustained current-limit events. The internal architecture combines a precision bandgap reference, three independent comparator channels, and a charge-pump gate driver for the external pMOSFET. By sourcing a regulated gate pull-up, the charge pump keeps the pFET fully enhanced across the full 5.5 V to 60 V input range, which minimizes R_DS(on) variation and ensures predictable current-limit behavior even at high line voltages. Typical applications include 24 V industrial bus protection, 48 V telecom rectifier protection, automotive load-dump survival, USB Type-C / PD VBUS protection, and battery hot-plug circuits. In each case the MAX17525 replaces discrete TVS, fuse, and hot-swap designs with a single IC and one external pMOSFET. When designing with this part, select the external pMOSFET voltage rating to cover the worst-case V_IN plus reverse polarity case (datasheet recommends 60 V or 100 V rated parts). The OV/UV/ILIM resistor dividers should use 1% tolerance to maintain accurate trip thresholds across the full -40 C to +125 C range. This page synthesizes distributor pricing, drop-in alternatives, and application guidance not found in the manufacturer datasheet alone, helping engineers shorten BOM evaluation cycles and avoid common pMOSFET selection pitfalls.
MAX17525ATP+T - Adjustable OV/UV/OC Power Limiter TQFN-20 | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX17525ATP+T is a high-accuracy, adjustable power limiter that provides overvoltage (OV), undervoltage (UV), and overcurrent (OC) protection in a 20-pin TQFN (5 mm x 5 mm) package with exposed pad. It guards downstream circuitry against positive overvoltage, reverse-voltage, and overcurrent faults, with reverse-current blocking and overtemperature shutdown. Used together with a single optional external p-channel MOSFET, the MAX17525 delivers a complete hot-swap / eFuse-style system protection solution for 1.8 V to 40 V rails. A power limiter (also called an adjustable circuit breaker, hot-swap controller, or eFuse IC) sits between an upstream supply and a downstream load, combining the functions of a fuse, a switch, and a supervisor. It belongs to the broader power-management IC family, sitting hierarchically below voltage regulators and supervisors in a typical system power tree. Power limiters add active, resettable, programmable protection that a simple fuse or PTC cannot match, which is why they are widely adopted in USB, PoE, industrial 24 V, and battery-port applications. Key specifications include an adjustable OV/UV window, an adjustable current-limit threshold, internal charge-pump driven pMOSFET gate control, reverse-current blocking, thermal shutdown, and a fault flag output. The MAX17525 operates across a -40 C to +125 C junction temperature range and is qualified to the standard industrial grade. Its small 5 mm x 5 mm TQFN footprint minimizes PCB area, and the exposed pad allows direct heat removal from the internal charge pump and current-sense path. The internal architecture combines a precision bandgap reference, two comparators for OV and UV thresholds, a current-sense amplifier for OC detection, and a charge pump that drives the gate of an external pMOSFET above VIN. Reverse-current blocking is implemented by actively pulling the gate up when VOUT exceeds VIN, turning off the external FET. An internal thermal sensor trips the fault flag and disables the pass element when junction temperature exceeds the safe limit. Typical applications include USB Type-C port protection, 12 V/24 V industrial sensor and PLC rails, PoE powered-device ports, hot-swap boards, battery-charging input protection, and any system that must survive a mis-wired, reverse-polarity, or short-circuit input. In each case the device replaces discrete TVS, PTC, Schottky, and supervisor circuitry with a single, smaller, configurable IC. When designing with the MAX17525, select the external pMOSFET so that its VDS and SOA ratings comfortably exceed the system VIN maximum and the worst-case load step. Choose input and output ceramic capacitors (typically 1 uF to 10 uF X7R) to handle the inrush profile programmed by the SS pin, and lay out the sense path as a Kelvin connection to the FET source for accurate current limiting. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical protection design notes that are not consolidated in the manufacturer datasheet alone.
MAX17613BATP+ - 60V, 3A OV/UV Protector | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX17613BATP+ is an adjustable overvoltage (OV) and overcurrent (OC) protection IC that operates from 4.5V to 60V and delivers up to 3A of continuous load current through a low 130 mOhm (typical) internal MOSFET. Housed in a 20-pin TQFN (4x4 mm) package with an exposed pad, this B-variant member of the Olympus protection IC family integrates adjustable OV/UV thresholds, programmable current limit, and reverse-current blocking in a single IC. A protection IC such as the MAX17613B belongs to the broader category of specialized power-management semiconductors. System-protection ICs sit between an upstream DC rail (USB, industrial 24V, battery, or PoE) and a downstream load, and their job is to disconnect the load within microseconds when the input voltage, current, or polarity strays outside a safe window. Within that family, the MAX17613B is the OV/UV-and-OC variant (the 'B' suffix) of the Olympus trio, sharing the same TQFN-20 footprint with the MAX17613A (OV/OC only) and MAX17613C (OV/UV/OC plus reverse-current blocking). Key features include a 4.5V-to-60V operating input range, a -65V negative-fault tolerance, internal 130 mOhm RON FET, adjustable OV/UV/OC thresholds via external resistors, and a fault FLAG output. The IC also supports parallel-mode current sharing for loads above 3A and provides thermal-shutdown protection. Quiescent current is typically 480 uA in normal operation, dropping to a few microamps in shutdown. The internal architecture combines a charge pump driving an N-channel MOSFET, a precision bandgap reference for the OV/UV comparators, and a current-sense amplifier that monitors the FET drain-to-source voltage for the OC loop. The device also integrates reverse-current blocking, which prevents current backflow into the source when the input collapses - a critical feature for USB-C and battery-powered systems. Typical applications include industrial PLC I/O protection, USB-C source power delivery, eMobility/EV auxiliary rails, 24V factory automation, battery-pack protection, and any 12V/24V/48V system that must survive load-dump transients. The compact 4x4 mm package and high integration reduce BOM cost compared with discrete TVS+fuse+MOSFET solutions. When designing with this device, derate output current based on PCB thermal performance; the TQFN-20 exposed pad must be soldered to a sufficient copper pour. Use Kelvin-sense layout at the OUT pin to keep OC threshold accuracy within +/-10 percent across temperature. This page synthesizes distributor pricing, drop-in alternative analysis, and practical PCB thermal notes that go beyond the manufacturer datasheet, helping engineers select and qualify the MAX17613BATP+ faster.
MAX6369KA/V+ - SOT-23-8 Pin-Selectable Watchdog Timer | ADI
The Analog Devices (formerly Maxim Integrated) MAX6369KA/V+ is a pin-selectable watchdog timer supervisor housed in a miniature 8-pin SOT-23 (KA) package. It monitors microprocessor activity and asserts an active-low reset when the system stops toggling the watchdog input within a programmed timeout. Operating from a +2.5V to +5.5V supply, the device draws only 8 µA of supply current and requires no external timing components, simplifying board layout in space-constrained designs. This variant is qualified to the AEC-Q100 automotive standard, making it suitable for automotive as well as industrial applications. A watchdog timer (WDT) is a hardware safety circuit that resets a microprocessor when its embedded firmware fails to service a periodic input within a defined window. Watchdog supervisors belong to the broader supervisor IC family (voltage supervisors, reset ICs, and sequencers) within the power management IC category. By offloading software-lockup detection from the microcontroller to a dedicated external device, designers add an independent safety net that operates even when the host CPU has halted, frozen, or branched into unintended code. Key features include pin-selectable watchdog timeout and reset delay windows, an open-drain active-low RESET output, and a watchdog disable input that allows the host to halt supervision during sleep or debug. The MAX6369KA/V+ shares the SOT-23-8 pinout with other members of the MAX6369-MAX6374 family, which differ primarily in default timeout values and reset polarity. This family-wide pin compatibility enables a single PCB layout to be reused across multiple timeout/polarity combinations. The device integrates a precision internal oscillator and timing logic, eliminating external RC components. The MAX6369KA/V+ uses open-drain reset architecture, which allows wired-OR connection with other supervisors in multi-rail systems. Its AEC-Q100 qualification makes it appropriate for automotive electronic control units (ECUs), body controllers, and battery management systems where component reliability across temperature extremes is required. Typical applications include automotive ECU watchdog supervision, industrial PLC processor monitoring, medical device firmware safety, IoT edge-node supervisory circuits, and any microcontroller-based product that requires a hardware watchdog timer to detect firmware lockups. When designing with the MAX6369KA/V+, observe the WDI pulse-width requirement and the minimum VCC ramp rate. For multi-rail systems, the open-drain output can be shared with other supervisors through a pull-up resistor to the logic-level rail. Refer to the manufacturer datasheet for the exact timing selection logic on the SET pins. This page consolidates distributor pricing, AEC-Q100 verified specs, drop-in alternatives from the same family and competitors, and practical design notes not found on a single distributor listing.
MAX6383XR31D2+T - 3.08V µP Supervisor, SC-70-3 | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX6383XR31D2+T is a microprocessor supervisor circuit in a 3-pin SC-70 surface-mount package that monitors a +3.08V power supply rail with a factory-trimmed reset threshold. Part of the MAX6381–MAX6390 family, it asserts an active-low open-drain reset whenever VCC falls below the threshold and holds reset for a minimum timeout period after VCC returns above the threshold, ensuring clean processor startup. The device operates from +1.8V to +5.0V while consuming only 3 µA of supply current, making it well suited to battery-powered and energy-harvesting systems. A microprocessor (µP) supervisor, also called a voltage supervisor or reset IC, is a dedicated power-management device that monitors one or more system rails and forces the host processor into a known-good state by holding it in reset whenever the rail is below a safe operating voltage. In the broader taxonomy, supervisors sit under Power Management ICs alongside voltage regulators, DC-DC converters, and battery management devices, providing deterministic power-on and brown-out behavior that bare POR (power-on reset) circuits inside a microcontroller cannot always guarantee under slow-rising or noisy rails. Key features of the MAX6383XR31D2+T include a factory-set 3.08V threshold (suffix 31), an open-drain / open-collector active-low RESET output suitable for wired-OR with other supervisors, a minimum reset timeout of approximately 40 ms (D2 suffix), and a tiny SC-70-3 (SOT-323) footprint measuring roughly 2.0 x 2.1 mm. The wide 1.8V to 5.0V operating range covers 2.5V, 3.3V, and 5V rails, and the 3 µA quiescent current minimizes load on the monitored rail. The part is rated for -40C to +85C operation and is supplied on tape-and-reel with the +T suffix. Internally, the device combines a precision bandgap reference, a comparator, a timeout timing block, and an open-drain MOSFET output driver. The comparator compares VCC against the internal reference; the timer block uses an internal oscillator and counter to generate the reset pulse width. Compared with a discrete RC reset circuit, this integrated approach provides tighter threshold accuracy (typically ±2.5% over temperature), immunity to capacitor leakage, and a guaranteed minimum reset pulse width that prevents processor latch-up on marginal power transitions. Typical applications include reset supervision for 3.3V MCUs and DSPs in IoT sensor nodes, handheld medical and instrumentation devices, portable consumer electronics, and any low-power embedded design where deterministic power-on behavior is required. The small SC-70-3 footprint enables placement directly at the IC supply pin to minimize trace-induced false resets. When designing with this part, add a pull-up resistor (typically 10 kOhm to 100 kOhm) from RESET to VCC because the output is open-drain. Place the supervisor as physically close as possible to the processor's VCC pin and bypass it with at least 0.1 µF to prevent noise-induced reset glitches. This page synthesizes distributor pricing, drop-in supervisor alternatives from the MAX6383 family and competitors, and practical design notes not found in the standalone datasheet.
MAX6385XS43D4-T - 4.38V µP Reset IC, SC-70-4 | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX6385XS43D4-T is a single-channel microprocessor (µP) reset/supervisor circuit housed in a 4-pin SC-70 (XS) surface-mount package. It monitors a single power-supply rail and asserts a push-pull/totem-pole active-low reset output whenever VCC falls below the factory-trimmed threshold of 4.38 V (the "43" in the part number), holding the reset line low through the factory-set timeout period after VCC recovers. The device consumes only 3 µA of supply current at +1.8 V, making it suitable for battery-powered and always-on systems. A microprocessor supervisory circuit is a type of power management IC (also called a voltage supervisor or reset IC) that protects digital logic by ensuring the system only starts executing code when the supply voltage is within a valid operating range. These devices belong to the hierarchy: reset supervisor -> power supply supervisor -> power management IC -> semiconductor. They are essential companions to microcontrollers, DSPs, ASICs, and FPGAs whose brown-out behavior is undefined and can cause latch-up, memory corruption, or runaway code execution. Key features of the MAX6385XS43D4-T include a factory-set 4.38 V threshold with ±2.5% accuracy over the -40 °C to +125 °C automotive temperature range, a 4-pin SC-70 package occupying roughly 2.0 × 2.1 mm of board area, and a push-pull (totem-pole) output that does not require an external pull-up resistor. The reset signal is active-low, matching the standard convention for µP reset inputs. The MAX6381–MAX6390 family shares a common architecture but offers different threshold voltages and package options, allowing designers to pin-select the appropriate threshold without firmware changes. Architecturally, the MAX6385 uses an on-chip bandgap reference and a precision comparator to compare VCC against the factory-trimmed threshold. A built-in delay generator controls the reset assertion time after VCC crosses the threshold (here, the "D4" code indicates the timeout duration family). The push-pull output stage can both sink and source current, enabling direct drive of the µP reset pin without external biasing components. Typical applications include microcontroller supply monitoring in IoT nodes, automotive body and chassis ECUs, industrial PLCs, point-of-sale terminals, and any battery-backed system that must recover deterministically from a brown-out event. Designers also use these supervisors to add safety-grade monitoring to ASICs and FPGAs whose internal power-on-reset is insufficient for their downstream circuitry. When selecting a supervisor, ensure the threshold sits comfortably above the µP's minimum operating voltage and below the regulated VCC nominal to provide adequate noise margin. For multi-rail designs, use one MAX6385 per monitored rail, or upgrade to the dual-rail members of the MAX6381–MAX6390 family.
MAX6468US46D3 - 4.625V Push-Pull Microprocessor Supervisor | Maxim Integrated
The Maxim Integrated MAX6468US46D3 (now under Analog Devices Inc./Maxim Integrated) is a low-power microprocessor (μP) supervisory reset circuit with edge-triggered, one-shot manual reset, offered in a 4-pin SOT143 (TO-253-4) surface-mount package. It monitors a single power-supply rail and asserts a reset output when VCC drops below the factory-trimmed 4.625V threshold, preventing code execution errors during brownout events. The device integrates a precision bandgap reference, comparator, and timing network in a single 1-chip solution. A microprocessor supervisor (also called a voltage supervisor or reset IC) is a type of power management IC that observes the system supply rail and generates a clean reset signal for the host controller whenever the rail is out of tolerance. Supervisors sit in the power-management hierarchy between raw supply regulation and the digital logic they protect; they are typically the last device to release reset and the first to assert it, ensuring deterministic processor boot behavior. Key features of the MAX6468US46D3 include a factory-set reset threshold of 4.625V, a push-pull (totem-pole) active-low RESET output, an edge-triggered manual-reset input (MR) that produces a single minimum-width reset pulse regardless of MR assertion duration, and a low quiescent supply current suitable for always-on battery-backed monitoring. The SOT143-4 footprint keeps the solution under approximately 2.9 mm² of board area, making it ideal for space-constrained portable and embedded designs. Internally, the part combines a precision voltage reference, a comparator, and a one-shot pulse generator. When VCC falls below the threshold, the comparator drives RESET low and the one-shot extends the pulse to the minimum guaranteed reset width, allowing downstream ASICs, FPGAs, or microcontrollers to complete their initialization routine even if VCC recovers rapidly. Typical applications include supervisory reset for 5V-tolerance microcontrollers, FPGA configuration controllers, battery-pack fuel-gauge ICs, and any hand-held, battery-powered, or industrial module that requires a guaranteed power-on reset plus a manual reset button. The automotive temperature grade (-40°C to +125°C) also makes it suitable for under-hood and chassis electronics. When designing with this part, place the bypass capacitor immediately adjacent to the VCC pin and keep the MR trace short to avoid stray-induced false resets. Verify that the 4.625V threshold matches the regulated rail tolerance of your system supply. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.
MAX6468US46D3+T - 4.625V MPU Supervisor w/ Manual Reset | Maxim
The Analog Devices (formerly Maxim Integrated) MAX6468US46D3+T is a microprocessor (µP) supervisory reset circuit with edge-triggered, one-shot manual reset, packaged in a 4-pin SOT-143 (TO-253-4). It monitors a single power-supply voltage and asserts an active-low reset whenever VCC falls below the factory-trimmed threshold of 4.625 V (the '46' code in the part number), holding reset low for a minimum timeout of 150 ms (the 'D3' suffix code) after VCC rises back above the threshold. A supervisor (or voltage supervisor / reset IC) is a power-management device whose job is to keep a microcontroller or DSP in a known safe state during power-up, power-down, and brown-out events. It belongs to the broader category hierarchy supervisor -> power-supply support circuit -> power-management IC -> semiconductor. The MAX6468 family combines a precision voltage reference, a comparator, a reset output stage (push-pull totem-pole, active-low), and a debounced manual-reset input that delivers a guaranteed single one-shot pulse even if the MR input is held low for an extended period. Key features include a ±2.5% reset threshold accuracy over temperature, a quiescent supply current of typically 5 µA, an open-drain/push-pull reset output (this variant is push-pull), and a wide operating temperature range of -40 °C to +125 °C for automotive-grade deployment. The SOT-143-4 footprint is among the smallest 4-pin supervisory packages available, ideal for space-constrained portable designs. The MAX6468 architecture uses a precision bandgap reference, comparator, and timing generator on a single die. The internal one-shot ensures that even a momentary or bouncing manual-reset press produces exactly one clean reset pulse of the specified width, simplifying firmware debounce and eliminating missed-reset edge cases common with simpler supervisor ICs. Typical applications include µP/µC brown-out protection in embedded systems, microcontroller reset sequencing in battery-powered portables, automotive ECU and body-controller supervisors, FPGA/CPLD configuration-supervision, and any system requiring a guaranteed reset pulse after power stabilization. The MAX6468 is also widely used in point-of-sale terminals, industrial PLCs, and consumer electronics where clean power-up behavior is mandatory. When designing with this device, ensure that the VCC ramp rate and decoupling meet the datasheet's minimum requirements. Because the reset output is push-pull (totem-pole), no external pull-up resistor is required - simplifying BOM count. The MR input is debounced internally, but a 1 nF to 10 nF capacitor may be added in noisy environments for additional immunity. This page synthesizes distributor pricing from Mouser, DigiKey, and Heisener, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
MAX6718UKYDD3 - Dual µP Supervisor, SOT-23-5 | Analog Devices
The Analog Devices MAX6718UKYDD3 is a dual-channel ultra-low-voltage microprocessor (µP) supervisory circuit from the MAX6715-MAX6729 family, housed in a 5-pin SOT-23 (SC-74A / SOT-753) surface-mount package. It is designed to monitor two system power-supply voltages and assert a reset signal when either supply drops below its preset threshold, ensuring reliable µP operation during power-up, power-down, and brownout events. A supervisory circuit (also called a voltage supervisor or reset IC) is a power management device that monitors one or more system rails and holds a processor in reset until the rails are stable and within tolerance. The category hierarchy is: supervisor -> reset IC -> power management IC -> semiconductor. Supervisors are essential in any system using an MCU, SoC, or FPGA, because processors can latch up or execute undefined code when supply voltages are out of specification during transient events. The MAX6718UKYDD3 features a factory-trimmed threshold set identified by the "YDD3" suffix (VCC1 reset threshold around 2.93V per the MAX6718 selection table, with VCC2 tracking), an active-low push-pull (totem-pole) RESET output, and a minimum reset timeout of 140 ms that gives downstream processors ample time to stabilize after the rails recover. The SOT-23-5 package enables placement in tight PCB footprints typical of space-constrained designs. The device integrates a precision bandgap reference, dual comparators, and timing logic on a single die, drawing only a few microamps of quiescent current. This makes it well-suited for battery-powered and always-on systems where supervisor current consumption directly impacts standby life. Typical applications include reset supervision in IoT sensor nodes, wearable health monitors, portable medical devices, industrial controllers, and any embedded MCU/SoC rail monitoring where a clean, glitch-free reset signal is required. The wide operating temperature range of -40C to +85C supports both consumer and industrial environments. When designing with this part, place the IC as close as possible to the µP reset pin to minimize trace-induced noise, and ensure VCC is well-decoupled with a 0.1uF ceramic capacitor. The push-pull output stage does not require an external pull-up resistor, simplifying layout compared to open-drain alternatives. This page synthesizes distributor pricing, parametric alternatives, and practical reset-topology design notes not found in the manufacturer datasheet alone.
MAX6718UKYDD3+T - Dual µP Supervisor, SOT-23-5 | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX6718UKYDD3+T is a dual ultra-low-voltage microprocessor supervisory circuit in a 5-pin SOT-23 (SC-74A, SOT-753) surface-mount package. It monitors two system power-supply voltages, asserts an active-low reset when either rail falls below its threshold, and features a minimum 140 ms reset timeout. The device belongs to the MAX6715-MAX6729 family of ultra-low-voltage µP supervisors. A microprocessor supervisory circuit (also called a voltage supervisor or reset IC) is a power management IC that monitors one or more system supply rails and asserts a deterministic reset signal to the host µP, µC, FPGA, or ASIC whenever a rail sags out of specification. Supervisors sit between the DC-DC converters/regulators and the digital logic they protect, forming the bridge between the power management subsystem and the digital control subsystem. The MAX6718 family extends this function to ultra-low-voltage cores (down to sub-1 V thresholds), making them suitable for modern processors with low-voltage rails. Key features include factory-trimmed or resistor-adjustable threshold options, push-pull (totem-pole) active-low RESET output, low quiescent current suitable for battery-powered designs, and a guaranteed minimum reset timeout of 140 ms after the supply recovers above threshold. The SOT-23-5 (SC-74A/SOT-753) package is one of the smallest industry-standard footprints and offers excellent thermal performance for the part's low dissipation. The MAX6718 uses an internal precision reference and comparator architecture per monitored rail. Threshold accuracy is factory-trimmed to within a few percent, providing clean rail monitoring without external precision components. The push-pull output stage can directly drive a µP reset input without external pull-up resistors, simplifying PCB layout and BOM. Typical applications include supervisory functions in embedded processors, FPGA/ASIC core and I/O rail monitoring, IoT edge nodes, battery-powered portable equipment, industrial controllers, and any system that requires deterministic power-on reset behavior. The MAX6718 is particularly well suited to designs where PCB area is at a premium and an SOT-23 supervisor outperforms larger SOIC or µMAX solutions. When designing with the MAX6718, place the bypass capacitor on VCC as close to the pin as possible (typically 0.1 µF ceramic). Ensure the trace impedance from the monitored rail to the sense input is low to avoid false resets during load transients. The reset output is open-drain or push-pull depending on the variant letter; check the order code to confirm the topology. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
MAX6718UKYDD3-T - Dual uP Supervisor, SOT-23-5 | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX6718UKYDD3-T is a dual-rail, ultra-low-voltage microprocessor supervisor IC housed in a 5-pin SOT-23 (SC-74A/SOT-753) package. It monitors two system supply voltages and asserts an active-low reset whenever any monitored rail falls below its factory-trimmed threshold, then holds reset for a minimum timeout after all rails recover. The YDD3 suffix denotes specific factory-trimmed thresholds for the two monitored inputs. A microprocessor supervisor (also called a voltage supervisor or reset IC) is a power management device that monitors one or more system supply rails and generates a clean reset signal to the host microcontroller or processor when those rails become unstable. Supervisors sit in the hierarchy: voltage supervisor -> supervisor & reset IC -> power management IC -> semiconductor. They are essential for deterministic boot behavior, brown-out protection, and protection against code execution at under-voltage conditions where MPU behavior is undefined. Key features of the MAX6718 include push-pull (totem-pole) reset output architecture, factory-trimmed thresholds (no external resistors required), a minimum reset timeout of 140 ms (suffix D3 selects the timeout option), and ultra-low quiescent current suitable for battery-backed systems. The SOT-23-5 footprint makes it one of the smallest supervisor ICs available, ideal for space-constrained designs. The device uses an internal bandgap reference and precision comparators to monitor the VCC and an auxiliary input. When either rail drops below its threshold, the RESET output pulls low; after both rails recover and the timeout elapses, RESET releases. The YDD3 suffix decodes per the Maxim datasheet to specific threshold voltages and the 140 ms minimum timeout. Typical applications include microprocessor reset circuits in portable/battery-powered equipment, embedded controller boards, IoT edge nodes, industrial sensors, and any system requiring reliable brown-out protection. The dual-rail monitoring makes it particularly useful for designs with separate digital and analog or core and I/O supplies. When designing with this device, ensure the monitored rails' nominal voltages are compatible with the YDD3 threshold option. Place the bypass capacitor as close as possible to the VCC pin and verify that the reset output drive capability matches the MPU reset pin input current requirements. This page synthesizes distributor pricing, factory-trimmed threshold options across the MAX6715-MAX6729 family, and design notes not consolidated in the manufacturer datasheet, providing information gain over single-distributor listings.
MAX6762TATAD3 - Dual Window Detector 3.3V/Adj | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX6762TATAD3 is a low-power, dual-voltage window detector (processor supervisor) in an 8-pin TDFN-EP (3x3) package with exposed pad for enhanced thermal dissipation. The MAX6762 monitors two independent system voltage rails - one factory-trimmed to 3.3V and the other adjustable down to 0.4V - asserting independent active-low RESET and active-low /RST outputs whenever either rail falls outside its programmed window. The part belongs to the MAX6754-MAX6764 family of window detectors and is offered in tape-and-reel packaging as the MAX6762TATAD3+T suffix variant. A window detector is a specialized supervisory circuit that asserts a reset or interrupt signal not only when a supply drops below a minimum threshold (undervoltage) but also when it rises above a maximum threshold (overvoltage). Window detectors belong to the broader class of voltage supervisors and reset ICs, which in turn sit within the power management IC hierarchy. Compared with single-threshold supervisors that only guard against brownouts, window detectors protect downstream ASICs, FPGAs, and processors from both kinds of supply excursion - critical for 12V/24V industrial buses, automotive load-dump transients, and any rail that must remain inside a tightly bounded operating envelope. Key features include a 5 uA (typical) quiescent current that suits always-on battery monitoring, factory-trimmed 3.3V nominal threshold on the first channel with +/-1.5% accuracy over temperature, an adjustable second channel settable from 0.4V up to VCC, push-pull active-low /RST output with a factory-fixed 185 ms minimum timeout period (the T3 suffix), and an open-drain /RESET output that can be wire-ORed with other supervisors. Operating from a wide 1V to 5.5V VCC supply and rated -40C to +125C, the part is automotive-grade and supports automotive temperature profiles. The MAX6762 uses a precision bandgap reference and trimmed resistor divider network to establish its 3.3V threshold; the second channel employs an external resistor divider on the ADJ pin. The internal comparator architecture provides fast response to threshold crossings while the 185 ms timeout masks short transients such as inrush bounces during power-up. The open-drain /RESET pin allows the part to be paralleled with another supervisor or to level-shift to a higher-voltage logic domain using an external pull-up resistor. Typical applications include multi-rail FPGA/ASIC power sequencing and monitoring, automotive ECU brownout/overvoltage protection, industrial 24V PLC and sensor rail supervision, battery-pack cell-balancer fault detection, and point-of-load monitoring in telecom hardware. In any application requiring proof that the supply remained inside an undervoltage-AND-overvoltage window during system startup, the MAX6762TATAD3 is a compact, low-power solution. When designing with this part, place the TDFN-EP exposed pad on a contiguous ground copper pour to keep junction temperature within spec under worst-case VCC=5.5V and -40C ambient. The /RESET open-drain output requires an external pull-up resistor to VCC or to the logic supply being monitored. The ADJ pin divider should use 1% or better tolerance resistors to preserve the factory-specified 1.5% threshold accuracy.
MAX6762TATAD3+T - Dual Window Detector, 3.3V/Adj, TDFN-8 | ADI
The Analog Devices (formerly Maxim Integrated) MAX6762TATAD3+T is a low-power, dual-voltage window detector IC that monitors undervoltage and overvoltage conditions on two system power rails simultaneously. Housed in an 8-pin TDFN-EP (3x3 mm) package, it integrates one fixed 3.3V threshold and one adjustable threshold (set via external resistors down to 0.4V), with open-drain and push-pull reset outputs in a 2-channel configuration. A window detector is a specialized supervisory IC that asserts a reset signal whenever a monitored supply voltage falls outside a programmable upper/lower window. It belongs to the broader family of voltage supervisors (also called voltage monitors or reset ICs) within the power management IC category, providing a critical safety net for microcontrollers, FPGAs, ASICs, and DSPs that must operate only when their rails are within spec. Key features include a wide VCC supply range from 1V to 6V, low quiescent current suitable for battery-powered systems, factory-trimmed threshold accuracy, and a typical active timeout period of 185 ms after a fault clears. The TDFN-EP package provides a thermal pad that reduces junction-to-ambient resistance, supporting reliable operation across the -40C to +125C automotive/industrial temperature range. Internally the MAX6762 uses a precision bandgap reference and matched comparators with hysteresis, allowing clean noise immunity on the monitored rails without external filtering. Two independent reset channels (one push-pull active-low, one open-drain active-low) give the designer flexibility to interface with mixed logic families or wired-OR multiple supervisor outputs. Typical applications include multi-rail monitoring of 3.3V core and 1.2V/1.8V auxiliary rails in portable instruments, automotive ECU power-good sequencing, battery management systems that need both over-voltage and under-voltage alarms, and industrial PLCs where a brown-out on any supply must trigger a controlled system reset. The dual-window architecture reduces component count versus using two single-channel supervisors. When designing with this part, place the TDFN-EP thermal pad on a properly sized copper pour and route the two monitored voltages directly to their IN pins with minimal trace resistance. Decouple VCC with a 0.1 uF ceramic capacitor close to the pin; do not rely on the monitored rail capacitance to hold VCC up during transients. This page synthesizes distributor pricing, drop-in TDFN-8 alternatives from the MAX6760/6761/6763/6764 family and competing supervisors from TI, plus practical design notes on threshold-setting resistors and reset-output wiring that go beyond the manufacturer datasheet.
MAX6762TATAD3-T - Dual Window Detector, 3.3V/Adj, TDFN-8 | Maxim
The Analog Devices (formerly Maxim Integrated) MAX6762TATAD3-T is a low-power, single/dual-voltage window detector supervisor housed in an 8-pin TDFN-EP (3x3 mm) package with exposed pad. It monitors undervoltage and overvoltage conditions on two supply rails: one factory-trimmed at 3.3 V and one externally adjustable down to 0.4 V, with an active-low RESET output and an open-drain/push-pull second channel. Per the manufacturer datasheet, the device operates from a single 1.0 V to 5.5 V VCC supply, draws only 8 uA quiescent current, and offers an active-low timeout period of 185 ms. A window detector is a specialized voltage supervisor IC that asserts a reset or interrupt when its monitored supply moves outside a programmable voltage window (between a lower undervoltage threshold and an upper overvoltage threshold). It sits in the broader power management IC hierarchy as a sub-category of supervisors and reset ICs, commonly placed between a regulator and a microcontroller, ASIC, or FPGA to guarantee the load only operates within safe supply limits during power-up, brown-out, and transient events. Key features include ±1.5% threshold accuracy over temperature, an integrated 185 ms reset timeout, low 8 uA supply current, and a small 3x3 mm TDFN package with an exposed thermal pad that improves heat spreading and allows an unobtrusive PCB layout. The MAX6762TATAD3-T ships on tape-and-reel (the -T suffix) and is qualified to the -40 C to +125 C automotive temperature range, making it suitable for harsh environments. The device uses a precision bandgap reference and trimmed resistor divider to set the fixed 3.3 V channel, while the second channel uses an external resistor divider referenced to the internal 0.4 V bandgap. This dual-monitor architecture lets one IC replace two single-channel supervisors, saving board area in dual-rail systems such as 3.3 V I/O plus 1.0/1.2/1.5/1.8 V core voltage monitoring. Typical applications include microprocessor/ASIC/FPGA core and I/O rail supervision in automotive infotainment, industrial PLCs, telecom line cards, and portable battery-powered equipment where low quiescent current extends battery life. The dual-window capability makes it especially useful in systems that must detect both undervoltage and overvoltage on the same supply. When designing with the MAX6762TATAD3-T, place the 0.1 uF VCC bypass capacitor within 3 mm of the VCC pin and connect the exposed pad (EP) to a grounded copper pour of at least 25 mm^2 for rated thermal performance. The OUT/active-low RESET pin is open-drain on some variants and push-pull on others, so verify the variant code (TATxx in the part number) before wiring the pull-up resistor. This page synthesizes distributor pricing, drop-in alternatives drawn from the same MAX6762 family, and practical layout guidance that goes beyond the manufacturer datasheet to accelerate evaluation and sourcing decisions.
MAX705ESA+T - 4.65V Threshold μP Supervisor, 8-SOIC | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX705ESA+T is a low-cost microprocessor (μP) supervisory IC housed in an 8-pin NSOIC (SOIC-8) package. It integrates power-supply monitoring, battery-backup switching, and a manual-reset input around a single 4.65 V reset threshold, and it is supplied on tape and reel (the +T suffix) for high-volume assembly. A microprocessor supervisor is a specialized power-management IC that watches the host system's VCC rail and asserts a clean reset signal to the MCU/MPU whenever that rail drops below a safe operating threshold or when the MCU is stuck and needs a fresh start. This product category sits inside the broader power-management hierarchy and reduces the number of discrete comparators, RC delays, and FET switches that older designs needed. Supervisors are widely used in embedded, industrial, and IoT systems where deterministic startup behavior is critical. Key features of the MAX705ESA+T include a 4.65 V ±2.5% reset threshold, a 200 ms minimum reset pulse width, an active-low push-pull RESET output, a manual-reset input (MR), and a power-fail comparator (PFI/PFO) for early warning of an impending supply collapse. The device operates over a 1.2 V to 5.5 V supply range and consumes roughly 200 μA of quiescent current, making it suitable for battery-backed designs. Internally, the part combines a precision bandgap reference, a comparator string, and timing logic that generates the guaranteed reset pulse. The MAX705 family shares the same 8-pin SOIC footprint as the MAX706/MAX707/MAX708/MAX813L parts, allowing PCB layout reuse across threshold and reset-polarity variants. The push-pull (totem-pole) output stage drives CMOS/TTL loads directly without a pull-up resistor. Typical applications include MCU reset supervision in industrial controllers, battery-backed SRAM/RTC switching, point-of-sale terminals, IoT edge nodes, embedded Linux boards, and any design requiring a clean, deterministic power-on reset. Designers also use the power-fail comparator to detect a low-battery condition before the rail collapses. When designing with this part, place the 0.1 μF bypass capacitor within 5 mm of the VCC pin, and verify that the chosen reset threshold sits below the MCU's minimum operating voltage. The MAX705ESA+T is pin-compatible with most MAX706/MAX707/MAX708/MAX813L variants in the same package. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not consolidated in the manufacturer datasheet, helping engineers select between same-family and cross-brand supervisory ICs.
MAX810TEXR+ - 3.08V Reset Supervisor, SC-70-3 | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX810TEXR+ is a 3-pin microprocessor reset circuit housed in a compact SC-70-3 (SOT-323) surface-mount package, designed to monitor the power supply of microprocessors and digital logic systems. The 'T' suffix denotes a factory-trimmed reset threshold of 3.08 V, making it a drop-in choice for systems powered from a nominal 3.3 V rail. The device issues an active-low reset pulse to the host MCU whenever VCC drops below the threshold, holding the reset line low for a minimum of 140 ms (typically 240 ms) after VCC recovers, which guarantees a clean startup of the microprocessor. A microprocessor reset circuit (also called a voltage supervisor or power-on reset IC) is a specialized monitor IC that sits between a system power rail and a microcontroller's RESET pin. Unlike discrete RC reset networks, supervisor ICs provide a precise, temperature-stable threshold, a defined reset pulse width, and immunity to brown-out events. In the hierarchy of power management semiconductors, the MAX810 family belongs to the supervisor and reset sub-category, complementing voltage regulators and DC-DC converters rather than replacing them. Key features of the MAX810TEXR+ include ultra-low supply current of typically 1.5 µA (max 17 µA over temperature), push-pull totem-pole output topology, no external components required, and a wide operating temperature range of -40 °C to +105 °C. The 3-pin SC-70-3 footprint is among the smallest reset-IC packages available, enabling its use in space-constrained wearables, IoT sensor nodes, and portable medical devices. According to the manufacturer datasheet, the part is fully specified over commercial and industrial temperature grades. Internally, the MAX810 combines a precision bandgap reference, a comparator, and a timing generator that produces the reset delay. The push-pull output stage eliminates the need for an external pull-up resistor, simplifying PCB layout and reducing BOM cost versus open-drain alternatives such as the MAX803. The totem-pole driver can source and sink current directly into the MCU reset input, supporting both 3.3 V and 5 V logic levels depending on VCC. Typical applications include 3.3 V microcontroller supervision in IoT endpoints, battery-powered portable electronics, embedded modules and SBCs, USB peripherals, and industrial sensor nodes. The MAX810TEXR+ is also commonly paired with low-power MCUs such as the STM32L0, PIC32MX, and MSP430 families to guarantee defined startup behavior after a brown-out or battery swap. When designing with this part, place it as close as possible to the MCU reset pin and keep the VCC trace short to minimize false resets from load transients. The push-pull output does not require a pull-up resistor, which saves board area. Avoid routing noisy switching signals adjacent to the supervisor's VCC pin. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet, enabling faster engineering decisions.
MC33972ATEWR2 - 22-Switch Detection Interface w/ Wake-up | NXP
The NXP MC33972ATEWR2 is a multiple switch detection interface with suppressed wake-up, designed to detect the closing and opening of up to 22 switch contacts in a 32-pin SOIC (BSSOP exposed pad) package. Operating from a 3.1 V to 5.25 V supply, the device transfers switch status to a microcontroller via an SPI serial interface and includes a 22-to-1 analog multiplexer for analog switch monitoring. A switch detection interface is a mixed-signal ASIC that replaces dozens of discrete input circuits in body, chassis, and industrial controllers by providing programmable pull-up or pull-down wetting current, programmable wet/dry switch thresholds, and on-chip debounce, all reported through a single high-speed SPI port. The MC33972 sits in the broader hierarchy: switch detection interface -> contact monitor IC -> body controller / BCM subsystem -> automotive ECU, and competes in the same node as TI's MSDI parts and onsemi's NCV73xx family for distributed switch scanning. Key features include a Normal mode that supplies pull-up or pull-down current while monitoring change-of-state, a Sleep mode with very low quiescent current for low standby power, an interrupt output that wakes the host MCU on any switch event, and built-in ESD protection on the switch inputs. The device supports both 3.3 V and 5.0 V SPI operation, making it directly compatible with the dominant automotive and industrial MCU families without level shifters. The architecture uses a precision current source for wetting, a programmable threshold comparator per channel, and an on-chip analog MUX to expose any input voltage to an external ADC. According to the NXP datasheet, this combination eliminates external resistor networks and allows one MC33972 to replace many opto-isolated or resistor-divider switch inputs. Typical applications include automotive body control modules reading door, seat, and lighting switches, industrial PLC digital input modules, aircraft and process control switch panels, and security-system keypad or contact-monitoring arrays. In all of these, the suppressed wake-up feature lets the MCU stay asleep until a real switch event occurs. When designing with this part, place a 0.1 uF decoupling capacitor as close as possible to the VDD pin, and follow the SPI timing diagram in the datasheet for maximum SCLK frequency. The exposed pad on the BSSOP-32 package must be soldered to the PCB ground plane for thermal and ESD performance. This page synthesizes NXP datasheet parameters, DigiKey/Mouser distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond the datasheet's typical-application schematic, providing an engineering decision baseline for selecting the MC33972ATEWR2.
MC33978EK - 22-Channel MSDI, SPI, 36V SMARTMOS | NXP
The NXP MC33978EK is a 22-channel multiple switch detection interface (MSDI) with programmable wetting current, housed in a 32-pin SOICW-EP exposed-pad package. It operates from 4.5V to 36V (full function) / 6.0V to 28V (full parametric) with a low-power mode current of 30 uA (IBATP) and 10 uA (IDDQ), and reports switch open/close status to an MCU through a 3.3V/5.0V SPI interface. What is a Multiple Switch Detection Interface (MSDI)? An MSDI is a specialized mixed-signal interface IC in the SMARTMOS power-management family that scans and debounces a large number of mechanical or electronic switch contacts (typical automotive body controllers require 10-30 discrete inputs). It replaces dozens of discrete pull-ups, comparators, and MCU GPIO with a single SPI-controlled device, providing programmable wetting current, programmable threshold, and integrated analog multiplexing. In the broader taxonomy, the MC33978EK belongs to switch detection interface IC -> body/comfort network interface IC -> power management and system basis IC -> mixed-signal semiconductor. Key features include 22 input channels (14 switch-to-ground SG plus 8 programmable SG/SB), 7-level selectable wetting current (2/6/8/10/12/14/16/20 mA), selectable wake-up on change of state, an integrated 24-to-1 analog multiplexer with buffered output, and a configurable 4.0V input comparator threshold. The exposed pad (EP) of the SOICW-EP package provides a low thermal resistance path, while the wide 4.5-36V input range survives automotive load-dump transients. Architecturally, the device uses SMARTMOS mixed-signal BiCMOS with on-chip non-volatile trimming, an SPI-protocol engine, and current sources that source programmable wetting current into each switch contact. The 24-to-1 analog MUX allows one ADC channel on the MCU to digitize any of the 22 inputs plus internal supplies, reducing MCU pin count and BOM. Typical applications include automotive body control modules reading door/window/seat switches, steering-wheel switch matrices, HVAC control panels, and any 12V/24V industrial system with many low-frequency switch contacts. When designing with this device, ensure the wetting current is sized for the contact material and keep the SPI traces short; the EP pad must be soldered to a copper pour for thermal relief and electrical ground.
MC34064D-5G - 4.59V UVLO Reset Controller | onsemi | 8-SOIC
The onsemi MC34064D-5G is an undervoltage sensing circuit specifically designed for use as a reset controller in microprocessor-based systems, supplied in an 8-pin SOIC package. It monitors a nominal 5V rail and asserts a low-going reset whenever VCC drops below the trimmed threshold of 4.59 V, providing a guaranteed minimum reset output sink current of 10 mA at low saturation. The device offers designers an economical solution for low voltage detection with only a single external resistor required for programming. A voltage supervisor (or voltage monitor / reset IC) is a type of power management integrated circuit that observes a system supply rail and generates a deterministic logic-level reset signal whenever that rail falls outside a safe operating window. Supervisors sit hierarchically beneath DC-DC converters and LDOs in the power tree, downstream of the regulator that establishes the rail they monitor and upstream of the microcontroller, FPGA, or ASIC that consumes the rail. The MC34064 family in particular targets legacy 5 V logic and early-generation microcontrollers where brownout-induced code corruption was a common failure mode. Key features of the MC34064D-5G include a trimmed-in-package bandgap reference, a comparator with precise thresholds and built-in hysteresis to prevent erratic reset operation, and an open-collector (open-drain) reset output that can be wire-ORed with other reset sources. The threshold is internally fixed at 4.59 V (typical), and the part draws a quiescent supply current of approximately 1 mA during normal operation, dropping to roughly 0.5 mA once a reset has been asserted. Technically, the MC34064 uses a bipolar process with an internal 2.5 V bandgap reference, scaled and trimmed to produce the 4.59 V undervoltage lockout (UVLO) trip point. Hysteresis of approximately 0.4 V is added by an internal feedback network, preventing chattering when VCC hovers near the threshold. The open-collector output requires an external pull-up resistor to the logic supply of the monitored system (commonly 5 V or 3.3 V), enabling logic-level translation. Typical applications include 5 V microprocessor and microcontroller reset circuits, UPS and battery-backed system controllers, automotive powertrain modules (with NCV33064 variant), industrial PLC logic supervision, and any 5 V system requiring a hardware brownout reset. The wide operating temperature range of -40C to +125C supports both commercial and industrial environments. When designing with this device, choose the external pull-up resistor to balance rise time against current consumption: a 10 kohm resistor yields a fast reset de-assertion edge with about 500 uA quiescent draw into the pull-up. The reset output must be debounced in software if the monitored rail has high ripple content. This page synthesizes distributor pricing, drop-in same-brand variants, and practical reset-circuit design notes not found in the onsemi datasheet alone.