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Diodes Incorporated PT7M7803SC3EX
- Part No.:
- PT7M7803SC3EX
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PT7M7803SC3EX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,960
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Product details
Overview
PT7M7803SC3EX from Diodes Incorporated is a precision 2.93V open-drain microprocessor supervisory circuit in SC70-3 package, featuring guaranteed RESET assertion down to VCC = 1.0V, 200ms reset pulse width, and no watchdog or manual-reset functionality. It monitors power supply integrity during power-up, brownout, and power-down in embedded microcontroller systems requiring reliable reset signaling under low-voltage conditions.
For engineers reviewing the PT7M7803SC3EX datasheet, PT7M7803SC3EX pinout, PT7M7803SC3EX application, or PT7M7803SC3EX equivalent, key selection criteria include its fixed 2.93V reset threshold, open-drain output architecture, absence of watchdog/manual-reset inputs, guaranteed operation at 1.0V VCC, and SC70-3 footprint compatibility with space-constrained PCB layouts.
Technical Context
The PT7M7803SC3EX implements a dedicated voltage-monitoring comparator with hysteresis (±2.5% over temperature) and an internal 200ms reset timeout timer. Its open-drain RESET output requires an external pull-up resistor and asserts low when VCC falls below 2.93V (VRN), remaining low for ≥140ms after VCC recovers above threshold.
No internal watchdog timer or manual-reset input circuitry is present - the device contains only VCC monitoring, threshold detection, and timed reset assertion logic. All functional blocks operate across –40°C to +85°C with supply current ≤30µA at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (±2.5% over –40°C to +85°C); triggers reset on VCC brownout |
| Reset Pulse Width | 200ms typical; ensures µP remains held in reset long enough for stable power recovery |
| Minimum Operating VCC | 1.0V; guarantees RESET valid even during deep brownout or battery sag |
| Output Type | Open-drain; enables wired-OR reset bus configuration and flexible voltage-level translation |
| Supply Current | ≤30µA at 5V; minimizes quiescent power in always-on monitoring applications |
| Package | SC70-3 (SOT323); 1.25mm × 2.1mm footprint for high-density PCBs |
| RoHS Compliance | Fully lead-free, halogen-free, and antimony-free per EU directives |
Pinout & Package
PT7M7803SC3EX is housed in a 3-pin SC70 (SOT323) plastic package with gull-wing leads, optimized for reflow soldering and automated assembly. Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Monitored voltage rail; reset asserted when VCC drops below 2.93V |
| GND | Ground reference | Common return path for all internal circuitry and reset timing |
| RESET | Open-drain reset output | Active-low signal; requires external pull-up; sinks current when asserted |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | Enables accurate reset initiation for 3.3V I/O domain systems with margin against noise-induced false triggers |
| Guaranteed 1.0V operation | Ensures deterministic reset behavior during battery depletion or unregulated supply collapse |
| 200ms reset timeout | Meets JEDEC JESD88 requirements for µP initialization stability after power recovery |
| Open-drain output | Supports multi-source reset buses and level-shifting without additional logic |
| Ultra-low ICC (≤30µA) | Extends battery life in portable and energy-harvesting applications |
Applications
| Industrial PLC Controller | Medical Sensor Node |
|---|---|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controllers with wide-input DC-DC converters. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset during 24V-to-3.3V converter dropout or EMI-induced rail sag. Use Value: Prevents firmware corruption by holding ARM Cortex-M4 in reset until 3.3V rail stabilizes for ≥200ms post-recovery. | Use Scenario: Battery-powered wearable vital-sign monitor with Li-ion cell (2.7–4.2V range). IC Role / Device Role / Timing Role: Low-battery warning and controlled shutdown trigger at 2.93V cutoff. Use Value: Guarantees MCU reset before brownout causes ADC misreads or BLE radio lockup. |
| Network Edge Router | Automotive Body Control Module |
Use Scenario: Reset coordination across multiple SoCs (CPU, switch ASIC, PHY) during 12V automotive input transients. IC Role / Device Role / Timing Role: Single-point reset generator synchronized to 3.3V domain power integrity. Use Value: Open-drain output allows shared reset bus with pull-up to 3.3V, eliminating need for discrete OR-ing diodes. | Use Scenario: Non-safety-critical interior lighting control using 5V-regulated supply from vehicle battery. IC Role / Device Role / Timing Role: Supervises 5V rail derived from buck converter; asserts reset during cold-crank (6.5V) or load-dump (28V) events. Use Value: 1.0V minimum VCC operation ensures reset remains active through full battery sag during engine start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803S-29SA-7 | Same 2.93V threshold, SC70-3, open-drain, but includes manual reset input (MR) | Supports push-button system reset; adds one external trace and debounced switch | Select if board layout allows MR routing and user-initiated reset is required |
| TPS3808G18DBVR | 2.93V threshold, SOT23-5, push-pull output, no MR/WDI, 35µA ICC | Eliminates external pull-up resistor but incompatible pinout and package | Select only if redesigning PCB for SOT23-5 and push-pull drive simplifies system-level reset buffering |
Compared with APX803S-29SA-7 and TPS3808G18DBVR, PT7M7803SC3EX offers minimal BOM count (no MR components) and smallest footprint (SC70-3), making it optimal for cost-sensitive, space-constrained designs where manual reset is unnecessary and open-drain flexibility is preferred.
Availability
PT7M7803SC3EX is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, network edge routers, and automotive body control modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for PT7M7803SC3EX 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 automotive markets.
The PT7M78xx family targets µP system reliability enhancement by integrating precision voltage monitoring, reset timing, and fault signaling into compact, low-power packages - specifically designed for embedded applications where power-supply integrity directly impacts firmware execution safety.
FAQ
What is the exact reset threshold voltage and tolerance for PT7M7803SC3EX?
The PT7M7803SC3EX has a nominal reset threshold of 2.93V, with ±1.5% tolerance at 25°C and ±2.5% over the full operating temperature range (–40°C to +85°C). This value is laser-trimmed during production and verified per Diodes Document 43008 Rev 2-4, Section 7.
Does PT7M7803SC3EX support watchdog or manual reset functionality?
No. PT7M7803SC3EX is a basic voltage supervisor with no watchdog timer (WDI pin absent) and no manual reset input (MR pin absent). Its function is strictly VCC monitoring and timed open-drain reset assertion - confirmed by pin configuration diagrams and functional description in Document 43008 pages 3–5 and 8.
Can PT7M7803SC3EX operate reliably below 2.0V VCC?
Yes. The device guarantees RESET output validity down to VCC = 1.0V, with RESET remaining low ≤0.4V until VCC drops below 1.0V. This is explicitly specified in DC Electrical Characteristics (Section 7) and Functional Description (Section 8) of Document 43008.
What is the recommended external pull-up resistor value for the open-drain RESET output?
A 10kΩ pull-up to the monitored VCC rail (or compatible logic voltage) is recommended. This ensures sufficient rise time (<100ns) while limiting sink current to <300µA during reset assertion, well within the 100µA max VOL specification at 1.0V VCC per Document 43008 Section 7.
PT7M7803SC3EX 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:
- Open Drain or Open Collector
- 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
PT7M7803SC3EX FAQ
1.How can I place an order for PT7M7803SC3EX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M7803SC3EX 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 PT7M7803SC3EX reliable?
The price and inventory of PT7M7803SC3EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M7803SC3EX is usually 5 days.
3.What payment methods are accepted for PT7M7803SC3EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M7803SC3EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M7803SC3EX?
PT7M7803SC3EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M7803SC3EX 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 PT7M7803SC3EX?
For technical support, including PT7M7803SC3EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M7803SC3EX requirements.
6.How does Aetrix verify that PT7M7803SC3EX is sourced from the original manufacturer or authorized distributors?
All PT7M7803SC3EX 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 PT7M7803SC3EX meets industry standards.
7.What is the process for return or replacement of PT7M7803SC3EX?
All PT7M7803SC3EX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M7803SC3EX, 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 PT7M7803SC3EX part is unused and in its original packaging.
Return procedure for PT7M7803SC3EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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