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STMicroelectronics STM1815RWX7F
- Part No.:
- STM1815RWX7F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
STM1815RWX7F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,863
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Product details
Overview
STM1815RWX7F 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 drops 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 reset and brownout protection.
For engineers reviewing the STM1815RWX7F datasheet, STM1815RWX7F pinout, STM1815RWX7F application, or STM1815RWX7F 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 STM1815RWX7F implements a precision voltage reference and comparator to continuously monitor VCC against a factory-trimmed 3.06 V threshold. Its internal timer generates a minimum 100 ms reset timeout (trec) after VCC rises above threshold, preventing premature MCU release during unstable power-up.
It uses a push-pull output stage capable of sourcing/sinking ≥20 mA, eliminating external pull-up components. The device maintains functional reset assertion down to VCC = 1.0 V across its full operating temperature range and rejects negative-going VCC transients ≤20 µs in duration when overdrive is ≤100 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06 V (typ.), ±2.5% accuracy over –40 °C to +105 °C - ensures precise 3.3 V/3.0 V rail monitoring without external calibration. |
| Reset Pulse Width | ≥100 ms - provides sufficient time for microcontroller initialization and memory stabilization before release. |
| Supply Current | 4 µA (typ.) at 25 °C - enables multi-year battery operation in portable and IoT edge devices. | Operating Voltage Range | 1.0 V to 5.5 V - guarantees reset assertion integrity even during deep brownout conditions. |
| Output Type | Active-low push-pull - drives MCU reset pin directly without external pull-up resistor or level-shifting. |
| Temperature Range | –40 °C to +105 °C - supports industrial and automotive under-hood applications with no derating. |
| VCC Transient Immunity | Rejects ≤20 µs negative glitches at 100 mV overdrive - prevents spurious resets from switching noise or ESD coupling. |
Pinout & Package
STM1815RWX7F is housed in a 3-pin SOT23-3 (WX) package - a surface-mount, lead-free, RoHS-compliant outline measuring 2.9 mm × 1.3 mm × 1.0 mm with gull-wing leads and 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives MCU reset pin low during fault; actively pulls high when deasserted - no external pull-up required. |
| 2 - VCC | Supply input and threshold monitor node | Directly connected to monitored 3.3 V/3.0 V rail; powers internal circuitry and feeds precision reference comparator. |
| 3 - VSS | Ground reference | System ground return path for all internal functions; must be low-impedance to ensure accurate threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 3.06 V (typ.) with ±2.5% tolerance - eliminates need for external resistive divider or trimming. |
| Guaranteed operation down to 1.0 V VCC | Valid reset assertion maintained at VCC = 1.0 V over full temperature range - critical for ultra-low-power wake-up sequences. |
| Low quiescent current | 4 µA typical - reduces system standby power by >90% vs. legacy supervisors (e.g., MAX809). |
| Push-pull active-low output | Capable of sinking ≥20 mA and sourcing ≥10 mA - directly interfaces with standard CMOS/TTL reset inputs without buffering. |
| High transient immunity | Immune to VCC glitches ≤20 µs wide at 100 mV overdrive - avoids false resets in noisy DC-DC converter environments. |
Applications
| Industrial PLC I/O Module | Medical Wearable Sensor Node |
|---|---|
Use Scenario: Power sequencing and brownout recovery in DIN-rail mounted programmable logic controller modules with isolated 3.3 V logic rails. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-low signal to ARM Cortex-M4 MCU during 3.3 V rail instability or cold start. Use Value: Prevents firmware corruption by ensuring MCU remains held in reset until 3.3 V stabilizes within ±3% for ≥100 ms - meeting IEC 61000-4-2/4-4 immunity requirements. | Use Scenario: Battery-powered ECG patch with ultra-low-power sleep mode and rapid wake-on-event capability. IC Role / Device Role / Timing Role: Monitors coin-cell-supplied 3.0 V LDO output and triggers hard reset on voltage sag below 3.06 V during RF transmission bursts. Use Value: Enables 12-month shelf life via 4 µA quiescent draw while guaranteeing deterministic restart after brownout - critical for FDA Class II device reliability compliance. |
| Automotive Body Control Module (BCM) | Smart Home Hub Power Management |
Use Scenario: Reset supervision for 3.3 V microcontroller domain in non-critical body electronics 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 input under –40 °C to +105 °C ambient. Use Value: Maintains functional reset assertion down to 1.0 V VCC and rejects ≤20 µs transients - satisfying ISO 7637-2 Pulse 4a/b immunity without additional filtering. | Use Scenario: Multi-rail power management in Wi-Fi/Zigbee gateway with independent 3.3 V MCU and 1.8 V radio domains. IC Role / Device Role / Timing Role: Dedicated supervisor for 3.3 V domain, coordinating reset timing with PMIC-controlled power sequencing. Use Value: Eliminates need for external pull-up resistor and reduces BOM count by one passive component per 3.3 V subsystem - improving manufacturing yield and board area efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 3.08 V threshold, ±2.5% accuracy, 140 ms reset pulse, SOT23-3, 2.5 µA IQ | Higher reset timeout and lower IQ, but lacks guaranteed 1.0 V operation and transient immunity specs | Select when longer reset hold time is preferred and VCC never falls below 1.2 V in system use case |
| TPS3808G30DBVR | 3.0 V threshold, ±0.5% accuracy, 200 ms reset pulse, SOT23-6, 1.5 µA IQ, enable input | Higher accuracy and lower IQ, but requires 6-pin package and external enable control | Select when sub-1% threshold tolerance is mandatory and board space allows SOT23-6 footprint |
Compared with MAX809TRD3-T and TPS3808G30DBVR, STM1815RWX7F offers the only combination of guaranteed 1.0 V operation, 100 ms reset timing, and push-pull drive in a 3-pin SOT23-3 - making it optimal for space-constrained, ultra-low-voltage brownout recovery designs.
Availability
STM1815RWX7F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical wearable sensor nodes, automotive body control modules, and smart home hub power management requiring stable component supply across extended product lifecycles.
Supply support for STM1815RWX7F 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, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.
STM181x is ST's low-power reset supervisor product line targeting cost-sensitive, space-constrained embedded systems requiring precision voltage monitoring and robust reset generation without external components.
FAQ
What is the exact reset threshold voltage for STM1815RWX7F?
The STM1815RWX7F has a factory-trimmed nominal reset threshold of 3.06 V, with ±2.5% accuracy over the full operating temperature range (–40 °C to +105 °C). This value is specified in Table 3 of the official STMicroelectronics datasheet (Doc ID11464 Rev 8), and applies to 3.3 V and 3.0 V supply monitoring applications.
Does STM1815RWX7F require an external pull-up resistor on the RST pin?
No. STM1815RWX7F features an active-low push-pull output stage, meaning it actively drives RST low during reset and actively pulls it high when deasserted. Unlike open-drain supervisors, it does not require an external pull-up resistor - simplifying layout and reducing BOM count.
Can STM1815RWX7F operate reliably during cold-crank automotive conditions?
Yes. STM1815RWX7F is guaranteed to assert valid reset down to VCC = 1.0 V across –40 °C to +105 °C, and rejects negative VCC transients ≤20 µs wide at 100 mV overdrive. These characteristics meet core requirements for cold-crank (ISO 16750-2) and load-dump (ISO 7637-2) immunity in non-safety-critical automotive body electronics.
How does the 100 ms reset timeout behave if VCC fluctuates near the threshold?
If VCC drops below 3.06 V, the internal timer resets and restarts upon VCC rising back above threshold. The 100 ms timeout is enforced only after VCC remains continuously above threshold - preventing premature release during marginal voltage recovery. This behavior is confirmed in Section 2.1 "Reset output" of the datasheet.
STM1815RWX7F 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:
- 2.55V
- 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
STM1815RWX7F FAQ
1.How can I place an order for STM1815RWX7F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM1815RWX7F 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 STM1815RWX7F reliable?
The price and inventory of STM1815RWX7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM1815RWX7F is usually 5 days.
3.What payment methods are accepted for STM1815RWX7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM1815RWX7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM1815RWX7F?
STM1815RWX7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM1815RWX7F 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 STM1815RWX7F?
For technical support, including STM1815RWX7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM1815RWX7F requirements.
6.How does Aetrix verify that STM1815RWX7F is sourced from the original manufacturer or authorized distributors?
All STM1815RWX7F 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 STM1815RWX7F meets industry standards.
7.What is the process for return or replacement of STM1815RWX7F?
All STM1815RWX7F units undergo pre-shipment inspection (PSI). If there is an issue with STM1815RWX7F, 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 STM1815RWX7F part is unused and in its original packaging.
Return procedure for STM1815RWX7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM1815RWX7F 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
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MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
Microchip Technology
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MCP809T-315I/TT
Microchip Technology
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