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STMicroelectronics STM1815TWX7F
- Part No.:
- STM1815TWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1815TWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
STM1815TWX7F from STMicroelectronics is a low-power, active-low push-pull reset supervisor IC designed to monitor 3.3 V or 3.0 V supply rails in microcontroller-based systems. It asserts reset when VCC falls below 3.06 V (typ.), guarantees valid output down to VCC = 1.0 V over –40 °C to +105 °C, delivers 100 ms minimum reset pulse width, and draws only 4 µA typical supply current. It is used in portable embedded systems requiring reliable power-on and brownout reset.
For engineers reviewing the STM1815TWX7F datasheet, STM1815TWX7F pinout, STM1815TWX7F application, or STM1815TWX7F equivalent, key selection criteria include reset threshold accuracy (±2.5%), SOT23-3 package compatibility, push-pull active-low RST drive capability, guaranteed operation at 1.0 V VCC, and immunity to fast VCC transients.
Technical Context
The STM1815TWX7F implements a precision voltage reference and comparator to monitor VCC against a factory-trimmed 3.06 V threshold. Its internal timer ensures a minimum 100 ms reset assertion period after VCC recovers above threshold, preventing premature MCU release during marginal supply conditions.
It uses a push-pull output stage with no external pull-up required, supports direct connection to standard MCU reset inputs, and features built-in immunity to negative-going VCC transients - tolerating ≤20 µs glitches of 100 mV amplitude without spurious reset generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06 V (typ.), ±2.5% accuracy over –40 °C to +105 °C - ensures consistent brownout detection across temperature and voltage tolerance bands |
| Reset Pulse Width | ≥100 ms - guarantees sufficient MCU initialization time after power recovery |
| Supply Current | 4 µA (typ.) at 25 °C - enables use in battery-powered and ultra-low-power applications |
| Minimum Valid VCC | 1.0 V - maintains correct RST logic state down to near-dead-battery conditions |
| Output Type | Active-low push-pull - drives RST low directly without external components; sinks current during reset assertion |
| Operating Temp | –40 °C to +105 °C - qualified for industrial and automotive under-hood environments |
| Package | SOT23-3 (WX) - 3-pin surface-mount footprint with 2.9 mm × 1.3 mm body, compatible with high-density PCB layouts |
Pinout & Package
The STM1815TWX7F is housed in a 3-pin SOT23-3 (WX) package with gull-wing leads, optimized for automated assembly and space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives MCU reset input low during undervoltage; no external pull-up needed; capable of sinking ≥20 mA |
| 2 - VCC | Supply voltage input and threshold monitor node | Directly connected to monitored rail; powers internal circuitry and feeds precision reference/comparator |
| 3 - VSS | Ground reference | System ground return path; must be low-impedance to ensure accurate threshold sensing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 3.06 V (typ.) with ±2.5% tolerance - eliminates need for external resistor dividers or calibration |
| Low quiescent current | 4 µA typical - extends battery life in always-on monitoring applications |
| VCC transient immunity | Rejects ≤20 µs, 100 mV negative VCC glitches - prevents false resets in noisy power environments |
| Guaranteed operation at 1.0 V | Valid RST output asserted down to VCC = 1.0 V (0 °C to +105 °C) - supports deep brownout detection before system collapse |
| Push-pull active-low output | No external pull-up required; compatible with standard MCU reset inputs - reduces BOM count and layout complexity |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Power supply monitoring during cold start and line sag in programmable logic controllers operating on 3.3 V rails. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low reset to ARM Cortex-M7 MCU until stable 3.3 V is confirmed and held for ≥100 ms. Use Value: Prevents firmware execution errors during undervoltage by enforcing deterministic reset timing and eliminating reliance on internal MCU POR circuits. | Use Scenario: Battery-backed operation of handheld ECG monitors where supply may dip below 3.3 V during peak sensor sampling. IC Role / Device Role / Timing Role: Reset supervisor maintaining MCU in reset while VCC drops below 3.06 V, then holding reset for full 100 ms after recovery. Use Value: Ensures clinical data integrity by blocking processor activity during marginal supply - critical for FDA-compliant device behavior. |
| Automotive Body Control Module | Smart Home Gateway |
Use Scenario: Monitoring 3.3 V domain in BCMs exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Active-low push-pull reset generator interfacing directly with Infineon AURIX™ TC3xx reset pin under –40 °C to +105 °C ambient. Use Value: Delivers robust reset assertion even at 1.0 V VCC, enabling fail-safe shutdown before logic corruption occurs during severe brownout. | Use Scenario: Low-power Wi-Fi gateway powered from USB-C PD source with variable 3.0–3.3 V output. IC Role / Device Role / Timing Role: Supervisor ensuring ESP32 resets cleanly on power-up and during USB port renegotiation-induced dips. Use Value: Eliminates boot failures caused by insufficient reset hold time - improves first-boot success rate from 92% to >99.9% in field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 3.08 V reset threshold (±2.5%), 140 µA supply current, SOT23-3 | Lacks guaranteed operation below 1.2 V VCC; higher current limits battery life in always-on designs | Select when legacy MAXIM compatibility is required and 1.0 V VCC operation is not needed |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 1.1 µA quiescent current, but requires external pull-up for open-drain output | Open-drain output necessitates external pull-up and adds BOM cost; superior accuracy but different interface topology | Select when ultra-low current dominates design priority and MCU reset pin supports open-drain configuration |
Compared with MAX809TRD3T, STM1815TWX7F offers 35× lower supply current and 0.2 V deeper brownout detection; versus TPS3808G30DBVR, it eliminates external components via push-pull drive but trades 0.5% threshold accuracy for proven industrial temperature stability and transient immunity.
Availability
STM1815TWX7F is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart home gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for STM1815TWX7F 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, delivering silicon solutions for automotive, industrial, and consumer markets with emphasis on reliability, energy efficiency, and embedded intelligence.
The STM181x series was developed specifically for low-power, high-accuracy reset supervision in space-constrained microcontroller systems - targeting applications where supply rail integrity directly impacts functional safety and data reliability.
FAQ
What is the exact reset threshold voltage for STM1815TWX7F?
The STM1815TWX7F has a factory-trimmed nominal reset threshold of 3.06 V, with ±2.5% accuracy guaranteed over the full –40 °C to +105 °C operating temperature range. This value is specified in ST's official datasheet (Doc ID11464 Rev 8, Table 3), and applies to the "T" grade ordering option used in this part number.
Does STM1815TWX7F require an external pull-up resistor on the RST pin?
No. The STM1815TWX7F features an active-low push-pull output, meaning its RST pin actively drives low during reset and high otherwise. Unlike open-drain supervisors, it does not require an external pull-up resistor - simplifying layout and reducing BOM count while ensuring strong drive capability (≥20 mA sink).
Can STM1815TWX7F operate reliably during fast VCC transients?
Yes. The device is designed to reject negative-going VCC transients up to 100 mV amplitude lasting ≤20 µs without generating spurious reset pulses. This immunity is achieved through internal comparator hysteresis and filtering, and is validated per Figure 19 in the datasheet - making it suitable for noisy automotive and industrial power environments.
What is the minimum VCC level at which STM1815TWX7F guarantees correct RST output logic?
The STM1815TWX7F guarantees correct active-low RST output behavior down to VCC = 1.0 V across the full operating temperature range (0 °C to +105 °C). Below 1.0 V, the output enters high-impedance mode; however, most MCUs cease operation well above this point, preserving functional safety during deep brownout events.
STM1815TWX7F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
STM1815TWX7F FAQ
1.How can I place an order for STM1815TWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1815TWX7F 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 STM1815TWX7F reliable?
The price and inventory of STM1815TWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1815TWX7F is usually 5 days.
3.What payment methods are accepted for STM1815TWX7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM1815TWX7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM1815TWX7F?
STM1815TWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1815TWX7F 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 STM1815TWX7F?
For technical support, including STM1815TWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1815TWX7F requirements.
6.How does Aetrix verify that STM1815TWX7F is sourced from the original manufacturer or authorized distributors?
All STM1815TWX7F 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 STM1815TWX7F meets industry standards.
7.What is the process for return or replacement of STM1815TWX7F?
All STM1815TWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1815TWX7F, 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 STM1815TWX7F part is unused and in its original packaging.
Return procedure for STM1815TWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1815TWX7F Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
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MCP809T-315I/TT
Microchip Technology
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