STMicroelectronics STM6315LBW13F

Overview

STM6315LBW13F from STMicroelectronics is a low-power open-drain microprocessor reset supervisor IC with 4.63V reset threshold, ±1.8% accuracy at 25°C, 30ms reset timeout (trec), guaranteed RST assertion down to VCC = 1.0V, and operation across –40°C to +125°C. It monitors VCC in embedded microcontroller systems and asserts active-low reset on supply drop or manual reset input.

For engineers reviewing the STM6315LBW13F datasheet, STM6315LBW13F pinout, STM6315LBW13F application, or STM6315LBW13F equivalent, key selection criteria include reset threshold tolerance, open-drain output voltage headroom (>VCC, ≤6V), manual reset debounce capability, transient immunity against negative VCC glitches, and SOT143-4 footprint compatibility for space-constrained industrial control modules.

Technical Context

The STM6315LBW13F implements a precision voltage comparator with internal reference and a monostable timer for reset pulse generation. Its open-drain RST output requires an external pull-up resistor (typically 10kΩ) to any voltage up to 6V - independent of VCC - enabling level-shifting reset signaling in mixed-supply systems.

It features a dedicated manual reset input (MR) with internal 63kΩ pull-up, TTL/CMOS-compatible thresholds, and built-in 100ns glitch rejection. The device maintains valid reset assertion during VCC decay down to 1.0V and provides temperature-compensated reset threshold stability (60 ppm/°C).

Key Specifications

Pinout & Package

SOT143-4 (W1) package: 4-pin, surface-mount, small-outline transistor outline with gull-wing leads; 3.04mm × 2.64mm body size, 1.92mm lead pitch, RoHS-compliant ECOPACK® construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervisor applications.

Compared with MAX809SEUR+T and TPS3808G33DBVR, the STM6315LBW13F uniquely combines 4.63V precision threshold, 30ms reset timing, manual reset support, and sub-2µA supply current in SOT143-4 - making it optimal for compact, low-power 5V microcontroller supervision where deterministic timing and field-serviceability matter.

Availability

STM6315LBW13F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, smart energy meters, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM6315LBW13F 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 sensing solutions for industrial, automotive, and consumer markets.

The STM6315 series belongs to ST's precision power monitoring product line, engineered specifically for robust, low-power reset supervision in mission-critical embedded systems operating under wide temperature and voltage stress conditions.

FAQ

What is the function of the MR pin on STM6315LBW13F?

The MR (Manual Reset) pin is an active-low input that forces the RST output low when pulled to VSS. It features an internal 63kΩ pull-up resistor, allowing it to float if unused. When asserted, RST remains low for the full trec period (30ms) even after MR returns high, and it rejects glitches shorter than 100ns - eliminating need for external debounce circuitry in most designs.

Can the RST output be pulled up to a voltage higher than VCC?

Yes - the RST pin is an open-drain output rated for pull-up voltages up to 6V, regardless of VCC level. This allows direct interfacing with higher-voltage logic domains (e.g., 5V MCU reset input) while powered from a lower VCC rail (e.g., 3.3V), without external level-shifting components. The output sinks up to 3.2mA while maintaining VOL ≤ 0.4V.

What is the minimum VCC required for guaranteed RST assertion?

The STM6315LBW13F guarantees RST assertion down to VCC = 1.0V. Below this, the output transitions to high-impedance (open circuit). For applications requiring RST validity down to 0V, ST recommends adding a 100kΩ pull-down resistor from RST to VSS - a design choice confirmed in Section 2.4 of the official datasheet.

How does the STM6315LBW13F handle power supply transients?

The device provides inherent immunity to negative-going VCC transients (glitches) via comparator overdrive design. As shown in Figure 12 of the datasheet, it rejects pulses ≤100ns wide at ≥50mV overdrive. Adding a 0.1µF bypass capacitor near the VCC pin further enhances immunity - a practice validated in ST's hardware hookup guidance (Figure 4) and referenced in Section 2.3.