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STMicroelectronics STM6322TWY6F
- Part No.:
- STM6322TWY6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
STM6322TWY6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,704
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Product details
Overview
STM6322TWY6F from STMicroelectronics is a 5-pin precision voltage supervisor IC with integrated watchdog timer and manual reset input, designed for microprocessor power monitoring in industrial embedded systems. It monitors VCC at 3.3 V (±2.5%), asserts active-low open-drain RST for ≥1.4 ms upon fault, supports MR-driven reset with internal 52 kΩ pull-up, and delivers 1.6 s watchdog timeout - all while consuming only 3 µA typical supply current.
For engineers reviewing the STM6322TWY6F datasheet, STM6322TWY6F pinout, STM6322TWY6F application, or STM6322TWY6F equivalent, this device serves as a drop-in solution for reliable power-on reset, brown-out detection, and firmware crash recovery in space-constrained MCU subsystems requiring guaranteed reset assertion down to VCC = 1.0 V.
Technical Context
The STM6322TWY6F implements a precision bandgap reference and comparator to monitor VCC against a fixed 3.3 V threshold (±2.5% over –40 to +85 °C), with reset assertion guaranteed down to VCC = 1.0 V. Its watchdog timer resets on WDI inactivity exceeding 1.6 s (typ.), cleared by any edge transition - enabling robust MCU supervision without external timing components.
It features an active-low open-drain RST output requiring external pull-up, a manually triggered MR input with internal 52 kΩ pull-up, and operates across 1.0–5.5 V supply range. The logic diagram confirms independent reset generation paths for VCC fault, MR assertion, and watchdog timeout - all converging to drive RST low for trec (≥1.4 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.3 V ±2.5% - ensures accurate brown-out detection for 3.3 V systems without external calibration |
| RST Pulse Width | 1.4 ms (typ.) - meets minimum reset hold time requirements of most ARM Cortex-M and legacy 8-bit MCUs |
| Watchdog Timeout | 1.6 s (typ.) - provides sufficient margin for firmware recovery loops while avoiding nuisance resets |
| Supply Current | 3 µA (typ., VCC < 3.6 V) - enables always-on supervision in battery-backed or ultra-low-power applications |
| Operating Temp | –40 to +85 °C - qualified for industrial-grade operation without derating |
| Reset Validity | Guaranteed to VCC = 1.0 V - ensures deterministic reset behavior during deep brown-out or power ramp-down |
| MR Input Pull-up | 52 kΩ internal - eliminates need for external resistor when using push-button reset; compatible with TTL/CMOS logic |
Pinout & Package
STM6322TWY6F is housed in a standard 5-pin SOT23-5 package (JEDEC MO-178AB), measuring 2.9 × 1.6 × 1.1 mm, with gull-wing leads and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog input | Edge-sensitive input; toggling within 1.6 s prevents reset; floating or tristated disables watchdog |
| 2 - VCC | Power supply | Monitored supply rail (1.0–5.5 V); reset asserted if voltage falls below 3.3 V ±2.5% |
| 3 - RST | Active-low open-drain reset output | Sinks current when asserted; requires external pull-up (e.g., 10 kΩ to system VCC) |
| 4 - MR | Manual reset input | Active-low; internal 52 kΩ pull-up allows direct switch-to-ground connection; no external debounce needed |
| 5 - VSS | Ground reference | Return path for internal circuitry and RST sink current; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| 3.3 V Precision Monitoring | ±2.5% threshold accuracy over full temperature range ensures consistent brown-out response without trimming |
| Open-Drain RST Output | Enables level-shifting and wired-OR reset bus configurations across mixed-voltage systems (e.g., 3.3 V supervisor driving 5 V MCU reset) |
| Integrated Watchdog Timer | 1.6 s timeout with edge-triggered clear eliminates need for external RC timing network or dedicated watchdog IC |
| Low-Power Supervision | 3 µA typical ICC allows continuous monitoring in energy-sensitive applications such as smart sensors and metering endpoints |
| Robust MR Interface | 52 kΩ internal pull-up and noise-immunity support (0.1 µF cap option) simplify push-button integration in noisy industrial environments |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controller modules exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Supervisor IC providing VCC brown-out detection, MR-initiated field service reset, and watchdog-triggered firmware restart after communication lockup. Use Value: Guarantees MCU reset remains valid down to VCC = 1.0 V during brown-out events, preventing undefined state entry in safety-critical control logic. |
Use Scenario: Long-life battery-backed electricity meter requiring tamper-resistant firmware supervision and infrequent manual calibration reset. IC Role / Device Role / Timing Role: Low-current (3 µA) supervisor enabling decade-scale backup battery life while delivering 1.4 ms reset pulse and 1.6 s watchdog timeout. Use Value: Open-drain RST output interfaces directly to 5 V microcontroller reset pin via 10 kΩ pull-up, eliminating level-shifter components. |
| Medical Diagnostic Handheld | Automotive Body Control Module (BCM) |
Use Scenario: Portable ultrasound or glucose analyzer with USB-powered operation and user-accessible reset button. IC Role / Device Role / Timing Role: Single-chip reset manager handling power-up sequencing, push-button reset (MR), and watchdog supervision of ARM-based application processor. Use Value: Internal 52 kΩ MR pull-up reduces BOM count and PCB footprint; 1.4 ms RST pulse satisfies ARM Cortex-M reset timing requirements. |
Use Scenario: Non-safety-critical BCM subassembly operating from vehicle battery (9–16 V) with LDO-regulated 3.3 V domain. IC Role / Device Role / Timing Role: Secondary supervisor monitoring regulated 3.3 V rail, asserting reset on undervoltage or MCU hang via WDI monitoring. Use Value: Guaranteed reset assertion to VCC = 1.0 V ensures fail-safe behavior during cold-crank battery dip conditions common in automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6321TWY6F | Identical pinout and package; differs only in reset threshold (5.0 V vs. 3.3 V) | Used where main supply is 5 V logic rail instead of 3.3 V | Select when supervising 5 V systems; otherwise not functionally interchangeable |
| TPS3808G125DBVR | 3.3 V threshold (±0.5%), 200 ms reset pulse, no MR input, higher ICC (12 µA) | Lacks manual reset capability; optimized for high-accuracy, low-jitter reset in telecom infrastructure | Choose when absolute threshold accuracy >2.5% is required and MR functionality is unnecessary |
Compared with STM6321TWY6F, STM6322TWY6F provides tighter application fit for 3.3 V domains and retains MR functionality; versus TPS3808G125DBVR, it trades threshold precision for integrated manual reset and lower quiescent current - making it preferable for cost-sensitive, feature-complete industrial MCU supervision.
Availability
STM6322TWY6F is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, medical handhelds, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for STM6322TWY6F 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, specializing in microcontrollers, power management, analog, and automotive ICs with strong industrial and embedded market focus.
STM6322TWY6F belongs to the STM6xxx supervisor family, engineered specifically for reliable, low-power microprocessor reset and watchdog supervision in space-constrained industrial and consumer electronics.
FAQ
What is the function of the WDI pin on STM6322TWY6F?
The WDI (Watchdog Input) pin is edge-sensitive: any rising or falling transition clears the internal 1.6 s watchdog timer. If WDI remains static (high or low) beyond that period, RST is asserted. Leaving WDI unconnected disables the watchdog function, as the internal counter drives a low-high-low pulse within the timeout window.
Can STM6322TWY6F supervise a 5 V supply?
No - STM6322TWY6F is factory-trimmed for 3.3 V ±2.5% threshold detection. For 5 V supervision, ST offers the pin-compatible STM6321TWY6F (5.0 V threshold) or STM6821 series. Using STM6322TWY6F on 5 V would result in immediate, permanent reset assertion.
How is the open-drain RST output configured externally?
The RST pin requires an external pull-up resistor to a valid logic supply (≤6 V). A 10 kΩ resistor to the target MCU's VCC rail is recommended. This configuration enables level translation, shared reset buses, and avoids contention with other open-drain drivers - unlike push-pull outputs.
Does STM6322TWY6F require external capacitors for stable operation?
No external timing or bypass capacitors are required. The device operates stably with only a 100 nF ceramic decoupling capacitor between VCC and VSS, placed near the SOT23-5 package. No RC network is needed for reset timing or watchdog function - all timing is internally generated.
STM6322TWY6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/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
STM6322TWY6F FAQ
1.How can I place an order for STM6322TWY6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6322TWY6F 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 STM6322TWY6F reliable?
The price and inventory of STM6322TWY6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6322TWY6F is usually 5 days.
3.What payment methods are accepted for STM6322TWY6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6322TWY6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6322TWY6F?
STM6322TWY6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6322TWY6F 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 STM6322TWY6F?
For technical support, including STM6322TWY6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6322TWY6F requirements.
6.How does Aetrix verify that STM6322TWY6F is sourced from the original manufacturer or authorized distributors?
All STM6322TWY6F 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 STM6322TWY6F meets industry standards.
7.What is the process for return or replacement of STM6322TWY6F?
All STM6322TWY6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6322TWY6F, 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 STM6322TWY6F part is unused and in its original packaging.
Return procedure for STM6322TWY6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6322TWY6F Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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