PT7M7809RTEX Diodes Voltage Supervisor IC, SOT-23-3 - Full Reel of 3,000
Overview PT7M7809RTEX from Diodes Incorporated is a single-channel microprocessor supervisory IC used to monitor a supply rail and issue a reset signal during power-up, power-down, and brownout conditions. It belongs to the PT7M78xx reset supervisor family and is supplied in a compact SOT-23-3 / TO-236-3 / SC-59 surface-mount package for dense embedded designs. This component is intended for circuits that need a simple fixed-threshold reset supervisor instead of a larger discrete monitoring network. The PT7M7809RTEX monitors one voltage rail with a 2.63 V reset threshold and provides an active-low push-pull/totem-pole RESET output. When the monitored VCC rail falls below the reset threshold, RESET is asserted low; after VCC rises back above the threshold, the reset output remains asserted for the reset timeout period before releasing the processor or logic circuit. Package Sale Basis Sales Unit One full reel Components Per Sales Unit 3,000 pieces Order Quantity 1 Includes 1 reel containing 3,000 PT7M7809RTEX components Inventory Packaging Marking REEL/3K Component Package SOT-23-3 surface-mount package This product is sold as a complete reel package for production purchasing and assembly handling. Order quantity 1 corresponds to one full reel containing 3,000 components. This format is suitable for buyers who need reel-based material for SMT assembly, feeder loading, kitting, or controlled continuation builds. Key Benefits Full-reel sales format supports automated assembly, feeder handling, and production kitting workflows. Helps keep a microprocessor, MCU, DSP, FPGA support circuit, or digital controller in a known reset state during unstable supply conditions. Fixed 2.63 V threshold supports circuits that need supervision around low-voltage digital rails. Push-pull active-low reset output removes the need for a pull-up resistor in many reset-line implementations. Small SOT-23-3 package supports dense PCB layouts and automated surface-mount placement. Operating temperature range of -40 C to +85 C fits common industrial and embedded electronics environments. Product Features Manufacturer part number: PT7M7809RTEX. Manufacturer: Diodes Incorporated. Function: simple reset / power-on reset supervisory circuit. Monitors one supply voltage and asserts reset during brownout, power-up, and power-down events. Active-low RESET output with push-pull / totem-pole topology. Reset output remains valid down to approximately 1.0 V VCC according to the PT7M78xx family documentation. Reset timeout is listed by DigiKey as 140 ms minimum; the family datasheet describes an approximately 200 ms reset pulse width. No manual reset input on this PT7M7809 variant. Full reel packaging for production assembly workflows. Technical Specifications Parameter Value Part Number PT7M7809RTEX Manufacturer Diodes Incorporated Product Category Integrated Circuits (ICs), Power Management (PMIC), Supervisors Sales Package Full reel Components Per Package 3,000 Supervisor Type Simple reset / power-on reset Number of Voltages Monitored 1 Reset Threshold Voltage 2.63 V Reset Output Active low Output Topology Push-pull / totem pole Reset Timeout 140 ms minimum; approximately 200 ms family reset pulse width Operating Temperature -40 C to +85 C (TA) Minimum Operating Voltage 1.0 V Maximum Input Voltage 5.5 V recommended maximum input range from product parameters Quiescent Current 10 uA product-parameter value Mounting Type Surface mount Package / Case TO-236-3, SC-59, SOT-23-3 Supplier Device Package SOT-23-3 Packaging Full reel, tape and reel format Base Product Number PT7M7809 Design and Selection Notes The PT7M7809RTEX is a focused reset supervisor for a single monitored rail. It is most useful when the system needs a clean reset signal during supply ramp-up, supply fall, or brownout rather than relying on the built-in reset behavior of a controller alone. In a typical design, VCC connects to the rail being monitored, GND is the system reference, and the active-low RESET output connects to the reset input of the downstream controller or logic device. Because this variant provides a push-pull reset output, review the reset net carefully before substitution. A push-pull output actively drives both high and low states, while open-drain reset supervisors depend on an external pull-up and may be easier to wire-OR with other reset sources. The PT7M7809RTEX should therefore be matched to circuits expecting an active-low, push-pull reset line. Also confirm that the 2.63 V threshold and reset timeout fit the target rail, processor reset requirement, and power sequencing plan. DigiKey and the Diodes product page identify the PT7M7809x family as obsolete, so it is best suited for maintenance, repair, existing builds, and controlled replacement of previously qualified designs. For new designs, review the datasheet and compare manufacturer-recommended alternatives before final design-in. Applications SMT production builds that require full-reel purchasing and reel-based feeder handling. Microprocessor, MCU, DSP, and embedded controller reset supervision. Power-on reset and brownout protection for low-voltage digital rails. Industrial control boards, sensor modules, and compact embedded systems. Networking, security, server/storage, and communication equipment support circuits. Battery-powered or adapter-powered electronics that need predictable reset behavior during supply transitions. Repair, replacement, and continuation builds where PT7M7809RTEX is already specified. Sourcing and Documentation Notes Please review the attached Product Specification PDF before purchase or design use. The datasheet is the controlling source for electrical limits, timing behavior, pin configuration, land pattern, package dimensions, ordering information, and absolute maximum ratings. Because lifecycle status and recommended alternatives can change, engineers and buyers should confirm the current manufacturer documentation and distributor parametric data during qualification. This listing is structured for full-reel purchasing. Buyers should confirm the reel size, component package, reset threshold, output topology, and date-code requirements before using this component in a qualified build or approved vendor list. FAQ What is PT7M7809RTEX best suited for? PT7M7809RTEX is best suited for microprocessor and microcontroller systems that need a dedicated reset supervisor to hold logic in a known state during power-up, power-down, and brownout events. What reset threshold should engineers design around? The PT7M7809R option corresponds to the 2.63 V fixed detect-voltage member of the PT7M78 family. Confirm the exact threshold, tolerance, and hysteresis against the datasheet before replacing or qualifying the part. Is the reset output active-low? Yes. The PT7M7809 family information identifies an active-low reset output. Check the host reset-pin requirements and timing so the downstream controller releases reset only after the supply is stable. Is PT7M7809RTEX push-pull or open-drain? The PT7M7809 family is listed with a push-pull reset output. Do not substitute an open-drain supervisor unless the reset network and pull-up requirements are reviewed. Does this part include watchdog or manual-reset functions? For the PT7M7809 device, the manufacturer product page lists watchdog as not included and manual reset as not included. Use a different PT7M78 family member if those functions are required. What does order quantity 1 include? Order quantity 1 means one full reel containing 3,000 PT7M7809RTEX components. Can another reset supervisor replace PT7M7809RTEX? Only after matching reset threshold, output polarity, output topology, reset delay, minimum operating voltage, package, pinout, temperature range, and lifecycle status. What should be checked for brownout protection? Verify that the trip threshold is above the minimum safe operating voltage of the processor or logic rail, and that reset remains valid during slow supply ramp or decay conditions. Is PT7M7809x still recommended for new designs? The Diodes product page identifies the PT7M7809x family as obsolete and lists alternative parts. For new designs, review current Diodes alternatives and requalify the reset threshold and output behavior. Where can I find the datasheet? Use the attached Product Specification PDF for PT7M78 family thresholds, reset timing, package details, and application conditions.