My Inquiry
My Account
Diodes Incorporated PT7M7809STEX
- Part No.:
- PT7M7809STEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PT7M7809STEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PT7M7809STEX from Diodes Incorporated is a precision 2.93V supply-voltage supervisor IC with push-pull active-low RESET output, 200ms reset pulse width, and guaranteed operation down to VCC = 1.0V. It monitors power-up, brownout, and power-down conditions in microprocessor systems and supports manual reset via CMOS-compatible MR input. Used in embedded servers and security systems requiring reliable power sequencing.
For engineers reviewing the PT7M7809STEX datasheet, PT7M7809STEX pinout, PT7M7809STEX application, or PT7M7809STEX equivalent, key selection criteria include its fixed 2.93V reset threshold, SOT23-3 package, push-pull RESET drive capability (3.2mA sink), watchdog-free configuration, and compatibility with 1.0–5.5V supply rails.
Technical Context
The PT7M7809STEX implements a dedicated reset generator with internal timebase for precise 200ms reset assertion after VCC exceeds the 2.93V threshold (±2.5% over –40°C to +85°C). Its reset logic is fully decoupled from watchdog functions-this part lacks WDI input entirely, distinguishing it from PT7M7823/24/25 variants.
It features a CMOS-compatible manual-reset input (MR) with no internal pull-up resistor (unlike PT7M7811/7823), requiring external pull-up if used. The push-pull RESET output guarantees VOL ≤ 0.4V at 3.2mA sink current and remains valid down to VCC = 1.0V, enabling robust low-voltage system initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% (–40°C to +85°C); ensures reliable detection of 3.3V rail brownout before MCU instability. |
| Reset Pulse Width | 200ms typical; provides sufficient hold time for full microprocessor reset and clock stabilization. |
| Supply Range | 1.0V to 5.5V; enables operation during deep brownout and compatibility with 1.8V/3.3V/5V systems. |
| RESET Output Type | Push-pull active-low; drives loads directly without external pull-up, sinking up to 3.2mA at VCC ≥ 4.5V. |
| Quiescent Current | 10–30µA at 5V; minimizes standby power impact in battery-backed or energy-sensitive applications. |
| MR Input Logic | CMOS-compatible active-low; requires external pull-up; no internal resistor-avoids unintended reset from floating node. |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded and networking equipment environments. |
Pinout & Package
PT7M7809STEX is housed in a 3-pin SOT23-3 plastic package (JEDEC TO-236AB), with pins arranged linearly: Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET. The MR input is absent-this variant has no manual reset capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Monitored voltage rail; RESET asserts when VCC falls below 2.93V and holds for 200ms after recovery. |
| GND | Ground reference | Common return path for all internal circuitry and RESET output; must be low-impedance for noise immunity. |
| RESET | Active-low push-pull output | Drives microprocessor reset pin directly; sinks 3.2mA minimum at VCC ≥ 4.5V; valid down to VCC = 1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | Enables accurate supervision of standard 3.3V logic rails with ±2.5% tolerance across full temperature range. |
| Guaranteed RESET at 1.0V VCC | Ensures deterministic reset assertion even during severe brownout, preventing MCU lockup or undefined state. |
| 200ms factory-trimmed reset timeout | Eliminates need for external RC timing components-reduces BOM count and layout area in space-constrained designs. |
| Push-pull RESET output | Supports direct connection to µP reset inputs without pull-up resistors, simplifying interface and improving noise margin. |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; contains <900ppm Br+Cl and <1000ppm Sb-meets automotive green requirements. |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
Use Scenario: Supervises 3.3V I/O and core power rails in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring deterministic boot after line transients or brownout events. Use Value: Prevents firmware corruption by holding MCU in reset until stable 3.3V is confirmed, with 200ms delay allowing oscillator startup. | Use Scenario: Monitors primary 3.3V supply in multi-port Ethernet routers where power integrity affects packet forwarding stability. IC Role / Device Role / Timing Role: Dedicated reset supervisor for ARM-based SoC, asserting RESET on any drop below 2.93V. Use Value: Eliminates need for discrete reset IC + RC network-reduces footprint and improves timing accuracy vs. RC-based solutions. |
| Embedded Security Camera | Server Baseboard Management |
Use Scenario: Ensures clean boot of image signal processor and video encoder in always-on surveillance cameras powered from PoE. IC Role / Device Role / Timing Role: Single-point power-good detector for 3.3V domain, interfacing directly with ISP reset pin. Use Value: Push-pull output drives reset line without external components; 1.0V VCC operation prevents false release during capacitor discharge. | Use Scenario: Provides fail-safe reset for BMC (Baseboard Management Controller) in enterprise rack servers during 3.3V rail fluctuations. IC Role / Device Role / Timing Role: Independent reset source for out-of-band management controller, decoupled from main CPU power sequencing. Use Value: 2.93V threshold matches 3.3V rail tolerance limits per Intel VRD specs, avoiding premature or delayed reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX809S-29SA-7 | Same 2.93V threshold, SOT23-3, push-pull RESET, but includes internal MR pull-up and operates down to 0.9V VCC. | Supports manual reset without external resistor; better suited for designs requiring field-serviceable reset buttons. | Select APX809S if MR functionality is needed; PT7M7809STEX is preferred when MR is unused and lowest BOM cost is critical. |
| TPS3809K33DBVR | 2.93V threshold, SOT23-3, open-drain RESET, 200ms timeout, but requires external pull-up and draws 12µA typical current. | Lacks push-pull drive-requires external 10kΩ pull-up; less suitable for high-noise or high-capacitance reset lines. | Choose TPS3809K33 only if open-drain topology is mandated for wired-OR reset bus architectures. |
Compared with APX809S-29SA-7 and TPS3809K33DBVR, PT7M7809STEX offers the lowest component count for basic 3.3V rail supervision-no MR support reduces pin count and eliminates pull-up resistor, while its push-pull output removes dependency on board-level pull-ups and improves noise immunity in dense layouts.
Availability
PT7M7809STEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, embedded security cameras, and server baseboard management requiring stable component supply and long-term manufacturability.
Supply support for PT7M7809STEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The PT7M78xx family targets microprocessor system reliability-designed specifically to replace discrete reset circuits with integrated, precision voltage monitoring and factory-trimmed timing in minimal footprint packages.
FAQ
What is the function of the MR pin on PT7M7809STEX?
The PT7M7809STEX does not have a Manual Reset (MR) pin-it is a 3-pin variant (VCC, GND, RESET) with no MR terminal. This distinguishes it from 5-pin versions like PT7M7811 or PT7M7823. No external reset button interface is supported.
Can PT7M7809STEX supervise a 1.8V supply rail?
No. PT7M7809STEX has a fixed 2.93V reset threshold optimized for 3.3V systems. For 1.8V supervision, Diodes offers PT7M7803 variants (e.g., PT7M7803TTEX with 3.08V threshold) or PT7M7809STEX's sibling PT7M7803STEX (2.93V) is not rated for reliable operation below 2.7V per datasheet min spec.
Does PT7M7809STEX include a watchdog timer?
No. PT7M7809STEX lacks Watchdog Input (WDI) functionality entirely. Watchdog capability is only present in 5-pin variants (PT7M7823/24/25) and select 4-pin SOT143 parts. This device provides pure voltage-monitoring and reset generation without timing supervision.
What is the maximum capacitive load the RESET output can drive?
The push-pull RESET output is specified to sink 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V. Assuming typical µP reset input capacitance of 10–20pF and 10kΩ internal pull-up, it reliably drives loads up to ~100pF. For heavier loads (>50pF), verify rise/fall times against target µP's reset setup/hold requirements.
PT7M7809STEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
PT7M7809STEX FAQ
1.How can I place an order for PT7M7809STEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7809STEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PT7M7809STEX reliable?
The price and inventory of PT7M7809STEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7809STEX is usually 5 days.
3.What payment methods are accepted for PT7M7809STEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7809STEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7809STEX?
PT7M7809STEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7809STEX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PT7M7809STEX?
For technical support, including PT7M7809STEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7809STEX requirements.
6.How does Aetrix verify that PT7M7809STEX is sourced from the original manufacturer or authorized distributors?
All PT7M7809STEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PT7M7809STEX meets industry standards.
7.What is the process for return or replacement of PT7M7809STEX?
All PT7M7809STEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7809STEX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PT7M7809STEX part is unused and in its original packaging.
Return procedure for PT7M7809STEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PT7M7809STEX Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
