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Diodes Incorporated PT7M7809ZTEX
- Part No.:
- PT7M7809ZTEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PT7M7809ZTEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
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Product details
Overview
PT7M7809ZTEX from Diodes Incorporated is a precision microprocessor supervisory IC with 2.32V reset threshold (Z suffix), push-pull active-low RESET output, 200ms reset pulse width, and guaranteed operation down to VCC = 1.0V. It monitors power supply integrity during power-up, brownout, and power-down in embedded microprocessor systems, supporting reliable system initialization in industrial controllers and network edge devices.
For engineers reviewing the PT7M7809ZTEX datasheet, PT7M7809ZTEX pinout, PT7M7809ZTEX application, or PT7M7809ZTEX equivalent, key selection criteria include its fixed 2.32V detection voltage, SOT23-3 package compatibility, absence of watchdog or manual-reset inputs, and suitability for cost-sensitive, low-pin-count reset supervision where only power-on/brownout reset assertion is required.
Technical Context
The PT7M7809ZTEX implements a dedicated voltage monitor with hysteresis (±2.5% over temperature) and an internal timebase that guarantees a 200ms (min 140ms, max 400ms) reset pulse after VCC rises above VRST. Its push-pull RESET output drives low to ≤0.4V at 3.2mA sink current and remains valid across the full 1.0V–5.5V supply range.
No watchdog timer or manual-reset input circuitry is integrated - the device is functionally minimal, optimized solely for supply-voltage monitoring and reset generation. The Z-suffix variant provides a 2.32V threshold, making it suitable for 2.5V or 3.3V rail supervision where tighter tolerance than standard 2.5V supervisors is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.32V ±2.5% over -40°C to +85°C - ensures reliable detection of brownout on 2.5V rails with margin against noise-induced false triggers |
| Reset Pulse Width | 200ms typical (140–400ms) - provides sufficient duration to hold microprocessor in reset until power stabilizes post-power-up or recovery |
| Supply Voltage Range | 1.0V to 5.5V - enables operation during deep brownout and supports wide-input industrial or battery-backed systems |
| RESET Output Type | Push-pull active-low - eliminates need for external pull-up resistor and delivers fast, low-impedance logic-level reset signal |
| Supply Current | 10–30µA at 5V - minimizes quiescent power impact in always-on monitoring applications |
| Output Sink Capability | 3.2mA at VCC ≥4.5V - directly drives standard CMOS microprocessor reset inputs without buffering |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded environments including networking and server management subsystems |
Pinout & Package
PT7M7809ZTEX is housed in a 3-pin SOT23-3 plastic package (Ordering Code T), with pins arranged as VCC, GND, and RESET. The package supports surface-mount reflow assembly and occupies minimal PCB area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Supplies operating power; reset asserted when voltage falls below 2.32V; functional down to 1.0V |
| GND | Ground reference | Common return path for all internal circuitry and output driver; must be low-impedance |
| RESET | Active-low push-pull reset output | Drives low (≤0.4V) during reset condition; high-impedance off-state not applicable due to push-pull structure |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32V threshold | Enables accurate brownout detection on 2.5V systems with ±2.5% tolerance over full temperature range |
| Guaranteed RESET validity at 1.0V | Ensures reset assertion remains functional even during severe undervoltage events before complete power collapse |
| 200ms reset timeout | Provides deterministic, factory-trimmed delay to prevent premature processor release before supply stabilization |
| Push-pull RESET output | Eliminates external pull-up component, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
| Lead-free & RoHS 3 compliant | Fulfills modern environmental compliance requirements without derating or special handling |
Applications
| Industrial PLC Controller | Network Edge Router |
|---|---|
|
Use Scenario: Power sequencing and brownout recovery in programmable logic controller CPU modules operating from 2.5V auxiliary rails. IC Role / Device Role / Timing Role: Voltage supervisor asserting hardware reset to ARM Cortex-M7 core during undervoltage conditions. Use Value: Prevents corrupted firmware execution by holding reset until 2.5V rail recovers and stabilizes for ≥200ms. |
Use Scenario: Supervision of 2.5V management ASIC power in fanless enterprise routers deployed in uncontrolled ambient environments. IC Role / Device Role / Timing Role: Dedicated reset generator triggered exclusively by 2.32V threshold crossing on primary management rail. Use Value: Eliminates need for external RC timing network while guaranteeing minimum 140ms reset pulse under worst-case temperature and voltage conditions. |
| Embedded Storage Module | Smart Energy Meter |
|
Use Scenario: Reset coordination between NAND flash controller and ARM-based SoC in solid-state storage modules powered from regulated 2.5V supply. IC Role / Device Role / Timing Role: Single-point voltage monitor ensuring synchronized reset assertion across memory and processing subsystems. Use Value: Avoids data corruption during power interruption by enforcing strict 200ms reset hold time independent of host software control. |
Use Scenario: Brownout protection for metrology SoC in ANSI C12.22-compliant electricity meters using 2.5V LDO-regulated supply. IC Role / Device Role / Timing Role: Low-quiescent-current (10µA typ.) supervisor enabling long-term battery backup operation during AC loss. Use Value: Maintains reliable reset assertion down to 1.0V VCC, extending functional supervision into deep brownout prior to supercapacitor depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX809S-23SA-7 | 2.32V threshold, open-drain RESET, SOT23-3, 1.0V–6.0V operation | Requires external pull-up; higher max VCC (6.0V); identical threshold but different output architecture | Select when system requires configurable reset polarity or shared reset bus with multiple devices |
| TPS3809K23DBVR | 2.32V threshold, push-pull RESET, SOT23-3, 0.9V–6.0V, 2.5µA IQ | Lower quiescent current (2.5µA vs. 10–30µA); same pinout and threshold; TI-qualified for extended temp | Prefer for ultra-low-power battery-backed applications where <5µA standby current is critical |
Compared with PT7M7809ZTEX, APX809S-23SA-7 trades push-pull simplicity for open-drain flexibility, while TPS3809K23DBVR offers significantly lower IQ but at higher unit cost and different qualification scope - PT7M7809ZTEX balances industrial temperature support, proven reliability, and cost-effective fixed-function supervision.
Availability
PT7M7809ZTEX is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, and smart metering applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.
Supply support for PT7M7809ZTEX 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 was designed specifically for microprocessor system supervision - reducing component count and improving power-rail monitoring accuracy in space-constrained embedded designs without integrating unnecessary features like watchdog or manual reset.
FAQ
What is the exact reset threshold voltage for PT7M7809ZTEX?
The PT7M7809ZTEX has a nominal reset threshold voltage of 2.32V, with ±2.5% variation over the full operating temperature range (-40°C to +85°C). This value is factory-trimmed and specified in the DC Electrical Characteristics table of the official Diodes datasheet (Document Number 43008 Rev 2-4).
Does PT7M7809ZTEX include a watchdog timer or manual reset input?
No. PT7M7809ZTEX is a minimal-function voltage supervisor with no watchdog timer (WDI pin) or manual reset input (MR pin). Its pinout consists solely of VCC, GND, and RESET - confirming it is intended only for power-supply monitoring and reset generation without additional supervision features.
Can PT7M7809ZTEX operate reliably below 2.5V supply?
Yes. PT7M7809ZTEX is fully functional down to VCC = 1.0V, with guaranteed RESET output validity (low-state voltage ≤0.4V) and correct threshold detection behavior throughout this range. This enables use in deep-brownout scenarios and battery-fail detection circuits where supply may sag well below nominal rail voltages.
What package type and lead finish does PT7M7809ZTEX use?
PT7M7809ZTEX uses the SOT23-3 plastic package (Ordering Code T) with fully lead-free, RoHS 3-compliant (2015/863/EU) terminations. It is halogen- and antimony-free per Diodes' "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb), and rated for reflow soldering per JEDEC J-STD-020.
PT7M7809ZTEX 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:
- 2.32V
- 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
PT7M7809ZTEX FAQ
1.How can I place an order for PT7M7809ZTEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7809ZTEX 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 PT7M7809ZTEX reliable?
The price and inventory of PT7M7809ZTEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7809ZTEX is usually 5 days.
3.What payment methods are accepted for PT7M7809ZTEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7809ZTEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7809ZTEX?
PT7M7809ZTEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7809ZTEX 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 PT7M7809ZTEX?
For technical support, including PT7M7809ZTEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7809ZTEX requirements.
6.How does Aetrix verify that PT7M7809ZTEX is sourced from the original manufacturer or authorized distributors?
All PT7M7809ZTEX 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 PT7M7809ZTEX meets industry standards.
7.What is the process for return or replacement of PT7M7809ZTEX?
All PT7M7809ZTEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7809ZTEX, 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 PT7M7809ZTEX part is unused and in its original packaging.
Return procedure for PT7M7809ZTEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PT7M7809ZTEX Tags
-
MIC826SYMT-TR
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