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STMicroelectronics STM6503SEAADG6F
- Part No.:
- STM6503SEAADG6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
STM6503SEAADG6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,739
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Product details
Overview
STM6503SEAADG6F from STMicroelectronics is a dual push-button Smart Reset IC with user-selectable reset setup delays (2 s / 6 s / 10 s min.), factory-programmable VCC monitoring threshold (1.575–4.625 V), and single active-low open-drain RST output. It operates from 1.0 V to 5.5 V, consumes low supply current (<3 µA at 25 °C), and is rated for industrial temperature range (–40 °C to +85 °C). Used in portable consumer electronics requiring robust, delayed-reset user interface behavior.
For engineers reviewing the STM6503SEAADG6F datasheet, STM6503SEAADG6F pinout, STM6503SEAADG6F application, or STM6503SEAADG6F equivalent, key selection criteria include programmable tSRC delay via TSR pin logic state, dual active-low SR0/SR1 input coordination, VCC undervoltage reset assertion, TDFN8 package footprint compatibility, and absence of battery monitoring or edge-triggered SRE functionality compared to related family members.
Technical Context
The STM6503 implements dual-input Smart Reset logic where both SR0 and SR1 must be held low for ≥tSRC to assert RST - preventing spurious resets from brief button presses. Its tSRC delay is set exclusively by the DC voltage level on the three-state TSR pin (GND = 2 s, open = 6 s, VCC = 10 s min.), with no external capacitor required.
VCC monitoring uses an internal comparator with factory-trimmed threshold options; reset remains asserted for tREC after VCC recovers above threshold. The RST output is open-drain, requiring external pull-up, and shares no internal pull-up or push-pull configuration options - unlike STM6502/STM6505 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| tSRC delay options | 2 s / 6 s / 10 s minimum; selected by TSR pin logic state - enables fixed, predictable reset hold-time without capacitor tolerance or leakage concerns. |
| VCC monitoring threshold | Factory-programmable 1.575 V to 4.625 V typical; ensures reliable power-on and brownout reset across diverse supply rails without external resistor dividers. |
| Supply voltage range | 1.0 V to 5.5 V; supports operation down to sub-1.2 V logic domains while maintaining valid RST output drive capability. |
| Operating temperature | –40 °C to +85 °C industrial grade; validated for sustained operation in handheld devices exposed to ambient thermal cycling. |
| Reset output type | Active-low open-drain RST; requires external pull-up resistor - provides flexible voltage-level translation and wired-OR reset bus capability. |
| Supply current (ICC) | <3 µA at 25 °C and 3.3 V; enables integration into always-on, battery-sensitive systems without measurable impact on standby life. |
| Package | TDFN8 (DG), 2 mm × 2 mm × 0.75 mm, 0.5 mm pitch; surface-mount footprint compatible with high-density portable PCB layouts and automated assembly. |
Pinout & Package
TDFN8 (DG) package: 2 mm × 2 mm body, 0.75 mm height, 0.5 mm lead pitch, exposed thermal pad (not electrically connected). Pin 1 marked by dot; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply and monitored voltage input | Primary power rail for device operation and VCC undervoltage detection source; requires 0.1 µF ceramic decoupling to VSS. |
| VSS | Ground reference | Common return path for all internal circuitry and external decoupling; must be low-impedance connection to system ground plane. |
| SR0 | Primary Smart Reset input | Active-low push-button interface; internally pulled up (65 kΩ); initiates tSRC timer when driven low with SR1. |
| SR1 | Secondary Smart Reset input | Active-low push-button interface; internally pulled up (65 kΩ); must be held low concurrently with SR0 for ≥tSRC to trigger RST. |
| TSR | Three-state tSRC programming control | Selects tSRC delay: GND = 2 s, open = 6 s, VCC = 10 s (all min.); open state requires 0.1 µF decoupling to VSS for noise immunity. |
| RST | Reset output | Active-low open-drain output; asserts low for tREC after tSRC completion or VCC undervoltage; requires external pull-up resistor. |
| NC (pins 6, 7) | No-connect | Not bonded; must be connected to VSS per layout guidelines to minimize parasitic coupling and ensure signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual coordinated Smart Reset inputs | SR0 and SR1 must both be held low ≥tSRC to generate reset - eliminates accidental resets from single-button presses or ESD glitches. |
| Fixed tSRC delay selection | Three discrete, capacitor-free delay options (2/6/10 s) via TSR pin logic state - simplifies BOM, eliminates capacitor aging and leakage drift. |
| Factory-trimmed VCC threshold | 1.575–4.625 V range with tight tolerance; removes need for external resistor networks and calibration during production test. |
| Ultra-low quiescent current | <3 µA at 3.3 V and 25 °C; extends battery life in always-on portable devices without compromising reset reliability. |
| Industrial temperature rating | –40 °C to +85 °C operation; qualified for use in smartphones, e-readers, and navigation devices subject to real-world thermal stress. |
Applications
| Smartphone Power Management | e-Reader System Recovery |
|---|---|
|
Use Scenario: User holds power button for >6 s to force hard reset after OS freeze. IC Role / Device Role / Timing Role: STM6503 monitors dual button press duration and VCC stability; asserts RST only after TSR-configured tSRC elapses and VCC remains valid. Use Value: Prevents unintended reboots from pocket-induced button presses while enabling guaranteed recovery from firmware lockups. |
Use Scenario: E-reader enters deep sleep but fails to wake; user triggers long-press reset. IC Role / Device Role / Timing Role: Coordinates SR0/SR1 signals to initiate tSRC timer; generates clean RST pulse independent of MCU state or supply ripple. Use Value: Guarantees full hardware reset even when application processor is unresponsive or supply voltage dips transiently. |
| Portable GPS Navigation | MP3 Player Firmware Recovery |
|
Use Scenario: GPS unit freezes during map rendering; user performs 10 s reset to reload firmware. IC Role / Device Role / Timing Role: Uses TSR = VCC to select 10 s tSRC; monitors VCC during reset sequence to prevent premature release if battery sags. Use Value: Ensures complete power cycle and memory initialization before boot, eliminating corrupted state persistence. |
Use Scenario: MP3 player locks up during file transfer; user holds play/power buttons simultaneously. IC Role / Device Role / Timing Role: Dual SR0/SR1 inputs detect coordinated press; tSRC delay prevents false triggers from mechanical bounce or EMI. Use Value: Delivers deterministic reset timing without software dependency - critical for embedded audio subsystems lacking watchdog support. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual push-button Smart Reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6502SEAADG6F | tSRC programmed by external capacitor (0.01–1 µF) instead of TSR logic; no three-state delay selection. | Requires capacitor selection, placement, and leakage management; less suitable for high-reliability, low-BOM-count designs. | Choose when fine-grained tSRC tuning (e.g., 4.5 s) is needed and capacitor sourcing is controlled. |
| STM6504SEAADG6F | Independent SR0 (delayed) and SRE (instant edge-triggered) inputs; includes 240 ms debounce on SRE falling edge. | Supports both timed and immediate reset paths; adds interrupt-capable SRE pin not present in STM6503. | Choose when system requires both user-initiated hard reset and fast firmware-triggered reset without shared timing constraints. |
Compared with STM6503SEAADG6F, STM6502 offers adjustable tSRC via capacitor but increases component count and sensitivity to leakage, while STM6504 adds instant SRE functionality at the cost of losing dual-coordinated SR0/SR1 behavior - making STM6503 optimal for pure dual-button delayed reset applications.
Availability
STM6503SEAADG6F is available at Aetrix Electronics and suitable for smartphone power management, e-reader system recovery, portable GPS navigation, and MP3 player firmware recovery requiring stable component supply, industrial-grade temperature performance, and consistent reset timing behavior.
Supply support for STM6503SEAADG6F 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STM65xx Smart Reset family targets portable electronics requiring robust, user-intent-validated hardware reset - specifically engineered to eliminate spurious resets while enabling guaranteed recovery from firmware hangs in battery-powered devices.
FAQ
What is the function of the TSR pin on STM6503SEAADG6F?
The TSR pin is a three-state digital input that selects the Smart Reset setup delay (tSRC): grounded → 2 s min., left open → 6 s min., tied to VCC → 10 s min. It is not a dynamic control signal - the state must be fixed during operation. An open TSR requires a 0.1 µF ceramic capacitor to VSS for noise immunity, as specified in the datasheet.
Does STM6503SEAADG6F monitor battery voltage or provide low-battery detection?
No. STM6503SEAADG6F does not include VBAT input or BLD output. Battery monitoring is exclusive to STM6505. This device monitors only VCC for undervoltage reset and relies solely on dual push-button inputs (SR0/SR1) for user-initiated reset - making it suitable for systems where battery status is handled separately.
Can STM6503SEAADG6F generate an active-high reset output?
No. STM6503SEAADG6F provides only an active-low, open-drain RST output. It lacks internal pull-up or push-pull drivers. To achieve active-high behavior, an external inverter or pull-down + level-shifting circuit is required - but this adds complexity and propagation delay not supported natively by the device.
Is the VCC monitoring threshold adjustable by the user?
No. The VCC reset threshold is factory-programmed during production and falls within the 1.575 V to 4.625 V range depending on orderable option (e.g., "S", "T", "U" suffixes). Users select the appropriate variant at purchase; no external resistors or configuration pins allow runtime adjustment of VRST.
STM6503SEAADG6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Smart Reset™
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Reset Timer
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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:
- 8-TDFN (2x2)
STM6503SEAADG6F FAQ
1.How can I place an order for STM6503SEAADG6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6503SEAADG6F 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 STM6503SEAADG6F reliable?
The price and inventory of STM6503SEAADG6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6503SEAADG6F is usually 5 days.
3.What payment methods are accepted for STM6503SEAADG6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6503SEAADG6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6503SEAADG6F?
STM6503SEAADG6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6503SEAADG6F 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 STM6503SEAADG6F?
For technical support, including STM6503SEAADG6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6503SEAADG6F requirements.
6.How does Aetrix verify that STM6503SEAADG6F is sourced from the original manufacturer or authorized distributors?
All STM6503SEAADG6F 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 STM6503SEAADG6F meets industry standards.
7.What is the process for return or replacement of STM6503SEAADG6F?
All STM6503SEAADG6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6503SEAADG6F, 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 STM6503SEAADG6F part is unused and in its original packaging.
Return procedure for STM6503SEAADG6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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