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Diodes Incorporated PT7M7811TTAEX
- Part No.:
- PT7M7811TTAEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
PT7M7811TTAEX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
PT7M7811TTAEX from Diodes Incorporated is a precision microprocessor (μP) supervisor IC with 2.93V reset threshold, 200ms reset pulse width, push-pull active-low RESET output, and integrated watchdog timer input (WDI). It monitors VCC during power-up/down/brownout, asserts reset below threshold, and supports manual reset via debounced CMOS MR pin. Used in embedded systems requiring reliable power sequencing and fault recovery.
For engineers reviewing the PT7M7811TTAEX datasheet, PT7M7811TTAEX pinout, PT7M7811TTAEX application, or PT7M7811TTAEX equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1.0V, ±2.5% threshold accuracy over –40°C to +85°C, internal 10–40kΩ MR pull-up, and watchdog timeout of 1.6s typical.
Technical Context
The PT7M7811TTAEX implements a dual-function supervisory architecture: a precision voltage monitor with hysteresis (VRTH = 4mV for T/S/R/K/Z/Y variants) and an edge-triggered watchdog timer that clears on any WDI transition or RESET assertion. Its reset generator guarantees monotonic low-state behavior across full VCC range (1.0V–5.5V), independent of supply ramp rate.
It features a dedicated CMOS-compatible manual-reset input with internal pull-up (10–40kΩ), enabling direct push-button interface without external components, and a push-pull RESET output capable of sinking 3.2mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V - eliminating need for external pull-up in most μP reset circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.93V nominal, ±2.5% over –40°C to +85°C - ensures accurate brownout detection for 3.3V systems |
| Reset Pulse Width | 200ms typical - provides sufficient time for μP initialization and peripheral stabilization |
| Supply Voltage Range | 1.0V to 5.5V - enables operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Watchdog Timeout | 1.6s typical - balances fault detection responsiveness with software execution margin |
| RESET Output Type | Push-pull active-low - drives μP reset pin directly without external pull-up resistor |
| MR Input Logic | CMOS-compatible, internally pulled up (10–40kΩ) - simplifies manual reset implementation with momentary switch |
| Quiescent Current | 10–30µA at 5V - minimizes standby power in battery-backed or energy-sensitive applications |
Pinout & Package
SOT23-5 package (TA suffix), 5-pin surface-mount plastic package with standard pin spacing and thermal profile suitable for reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power supply input | Primary supply rail; RESET asserted when VCC falls below 2.93V; valid operation down to 1.0V |
| 2: GND | Ground reference | Common return path for all internal circuitry and reset output sink current |
| 3: RESET | Active-low push-pull reset output | Drives μP reset pin low during power-up, brownout, or watchdog timeout; no external pull-up required |
| 4: MR | Manual reset input (active-low) | CMOS input with internal pull-up; pulling low forces reset for full 200ms pulse regardless of VCC level |
| 5: WDI | Watchdog input (CMOS) | Edge-sensitive input; rising/falling edges clear watchdog timer; floating disables watchdog function |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitoring | 2.93V threshold with ±2.5% tolerance over full temperature range ensures robust brownout immunity in 3.3V systems |
| Guaranteed RESET validity at low VCC | RESET remains functional and specified down to VCC = 1.0V - critical for graceful shutdown in battery-depleted conditions |
| Integrated watchdog timer | 1.6s timeout with edge-triggered WDI input enables software liveliness checking without external timing components |
| Debounced manual reset | Internal MR pull-up (10–40kΩ) and 200ns minimum MR pulse width tolerance eliminate need for RC filtering or Schmitt triggers |
| Push-pull RESET output | Capable of sinking 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V - directly interfaces with standard μP reset inputs |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers operating in harsh industrial environments. IC Role / Device Role / Timing Role: μP supervisor providing power-on reset, brownout protection, and watchdog supervision for ARM Cortex-M7 host processor. Use Value: 200ms reset pulse ensures complete firmware initialization before I/O enable; ±2.5% threshold stability prevents spurious resets under wide-temperature voltage drift. |
Use Scenario: Reliable boot and runtime supervision of multi-core SoC in enterprise-grade 10G Ethernet routers with redundant power supplies. IC Role / Device Role / Timing Role: Primary reset controller coordinating power-good sequencing between AC/DC converter, PoE injector, and baseband processor. Use Value: Push-pull RESET eliminates external pull-up, reducing BOM count; WDI integration enables periodic firmware heartbeat verification without GPIO overhead. |
| Smart Surveillance Camera | Medical Diagnostic Handheld |
|
Use Scenario: Power integrity assurance in always-on IP cameras with motion-triggered wake-up and battery backup. IC Role / Device Role / Timing Role: Supervisor monitoring main 3.3V rail and backup coin-cell supply, asserting reset on undervoltage or watchdog timeout. Use Value: Valid operation down to VCC = 1.0V allows clean shutdown during battery depletion; MR pin enables hardware-initiated firmware update reset. |
Use Scenario: Safety-critical power management in portable ultrasound or ECG devices where unexpected reset must be avoided unless confirmed fault occurs. IC Role / Device Role / Timing Role: Dual-role supervisor performing both power-on reset and runtime watchdog supervision of safety-monitoring MCU. Use Value: Precision 2.93V threshold aligns with Li-ion battery discharge curve; guaranteed RESET behavior at 1.0V supports controlled data save before power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Fixed 3.08V threshold, no WDI, SOT23-3 package, open-drain RESET | Lacks watchdog and manual reset; requires external pull-up; suited for simple reset-only use cases | Select when only basic power-on reset is needed and board space is constrained to 3-pin footprint |
| TPS3808G12QDBVRQ1 | Adjustable threshold (via external resistor), 200ms fixed delay, WDI support, automotive-grade (-40°C to +125°C) | Higher temp rating and adjustable threshold, but higher quiescent current (1.1µA vs 10µA typical) and larger SOT23-6 package | Select for AEC-Q100 automotive designs or when threshold fine-tuning is required beyond factory-set values |
Compared with MAX809SEUR+T and TPS3808G12QDBVRQ1, PT7M7811TTAEX offers integrated WDI and MR in SOT23-5 at lower cost and quiescent current, making it optimal for industrial and networking applications needing full supervision in minimal footprint.
Availability
PT7M7811TTAEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network routers, smart surveillance cameras, and medical handheld diagnostics requiring stable component supply and long-term manufacturability.
Supply support for PT7M7811TTAEX 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 is designed specifically for μP system reliability - integrating precision voltage monitoring, watchdog supervision, and manual reset in compact packages to reduce external component count and improve power-up robustness.
FAQ
Does PT7M7811TTAEX support watchdog functionality?
Yes. The PT7M7811TTAEX includes a dedicated WDI (Watchdog Input) pin that detects rising or falling edges to clear the internal watchdog timer. If WDI remains static for 1.6s (typical), the device asserts RESET. Leaving WDI unconnected disables the watchdog function entirely.
What is the minimum VCC required for guaranteed RESET operation?
The device guarantees valid RESET/RESET output behavior down to VCC = 1.0V. At this voltage, RESET is specified to remain low (≤0.4V) during brownout, and the internal reset generator maintains timing integrity - enabling safe shutdown sequences in battery-depleted systems.
Can the MR pin be left unconnected?
Yes. The MR pin has an internal CMOS pull-up resistor (10–40kΩ), so it may be left floating when manual reset is not used. No external pull-up is required. However, if noise immunity is critical, a 100kΩ external pull-up may be added - though not necessary per design.
Is PT7M7811TTAEX pin-compatible with other PT7M78xx variants?
No. PT7M7811TTAEX uses the SOT23-5 (TA) package with pins VCC-GND-RESET-MR-WDI. It is not pin-compatible with 3-pin (T/C3) or 4-pin (TB) variants like PT7M7803 or PT7M7812, which have different pin counts and functions - e.g., PT7M7812 lacks WDI but adds RESET.
PT7M7811TTAEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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-23-5
PT7M7811TTAEX FAQ
1.How can I place an order for PT7M7811TTAEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7811TTAEX 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 PT7M7811TTAEX reliable?
The price and inventory of PT7M7811TTAEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7811TTAEX is usually 5 days.
3.What payment methods are accepted for PT7M7811TTAEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7811TTAEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7811TTAEX?
PT7M7811TTAEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7811TTAEX 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 PT7M7811TTAEX?
For technical support, including PT7M7811TTAEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7811TTAEX requirements.
6.How does Aetrix verify that PT7M7811TTAEX is sourced from the original manufacturer or authorized distributors?
All PT7M7811TTAEX 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 PT7M7811TTAEX meets industry standards.
7.What is the process for return or replacement of PT7M7811TTAEX?
All PT7M7811TTAEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7811TTAEX, 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 PT7M7811TTAEX part is unused and in its original packaging.
Return procedure for PT7M7811TTAEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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