STMicroelectronics STM6315RAW13F

Overview

STM6315RAW13F from STMicroelectronics is a low-power open-drain microprocessor reset supervisor IC that monitors V_CC and asserts an active-low reset signal when supply voltage falls below 2.63 V (±1.8% at 25°C), with guaranteed RST assertion down to V_CC = 1.0 V, 1.5 µA typical supply current, and operation across –40 to +125°C - used in industrial MCU power-up sequencing and brownout protection.

For engineers reviewing the STM6315RAW13F datasheet, STM6315RAW13F pinout, STM6315RAW13F application, or STM6315RAW13F equivalent, key selection considerations include reset threshold accuracy, open-drain output compatibility with higher-voltage logic rails, manual reset input with internal 63 kΩ pull-up, and guaranteed reset pulse width of 1.5 ms over full temperature range.

Technical Context

The STM6315RAW13F implements a precision voltage comparator with factory-trimmed 2.63 V reset threshold and integrated reset time-out timer generating a fixed 1.5 ms (typ) active-low pulse after V_CC recovery. Its open-drain RST output supports external pull-up to any voltage ≤6 V, independent of V_CC, enabling interoperability with mixed-supply systems.

It features a dedicated manual reset input (MR) with TTL/CMOS-compatible thresholds, 1 µs minimum pulse width support, 100 ns glitch rejection, and internal 63 kΩ pull-up - eliminating external components for basic push-button reset. The device maintains valid RST assertion during negative-going V_CC transients up to 100 µs (at 100 mV overdrive), enhanced by on-board noise immunity design.

Key Specifications

Pinout & Package

Supplied in SOT143-4 (W1) package: 4-pin, small-outline transistor outline, 3.04 mm × 2.64 mm footprint, 1.12 mm max height, lead-free ECOPACK® compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US26D3+T and TPS3808G125DBVR, the STM6315RAW13F uniquely combines 2.63 V precision threshold, 1.5 ms fixed timeout, –40 to +125°C operation, and 1.5 µA supply current in SOT143-4 - making it optimal for space-constrained, high-temp, low-power reset supervision where drop-in compatibility and minimal BOM are critical.

Availability

STM6315RAW13F is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical diagnostics requiring stable component supply, long-lifecycle availability, and AEC-Q200-aligned reliability.

Supply support for STM6315RAW13F 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM6315 belongs to ST's supervisory IC product line, engineered specifically for high-accuracy, low-power reset generation in mission-critical embedded systems operating across extreme temperatures and noisy power environments.

FAQ

What is the function of the MR pin on STM6315RAW13F?

The MR (Manual Reset) pin is an active-low input that forces the RST output low when pulled below its logic threshold (≤0.3×V_CC). It features an internal 63 kΩ pull-up resistor, allowing direct connection of a push-button switch to ground without external components. RST remains asserted for the full 1.5 ms timeout after MR returns high, and the input rejects glitches shorter than 100 ns.

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

Yes - the RST pin is an open-drain output rated for pull-up voltages up to 6 V, regardless of V_CC level. This allows interfacing with higher-voltage logic families (e.g., 5 V I/O) while V_CC operates at 3.3 V or lower. A 10 kΩ pull-up resistor is recommended for most applications to ensure proper logic levels and drive capability.

What is the minimum V_CC required for guaranteed RST assertion?

The STM6315RAW13F guarantees RST assertion down to V_CC = 1.0 V. Below this voltage, the RST output transitions to high-impedance (open circuit) rather than floating. For applications requiring RST to remain low even at V_CC < 1.0 V, a 100 kΩ pull-down resistor from RST to V_SS is recommended to maintain active-low state.

How does the STM6315RAW13F handle power supply transients?

The device provides built-in immunity to negative-going V_CC transients: it will not generate spurious resets for pulses under the curve in Figure 12 of the datasheet - e.g., ≤100 µs duration for 100 mV overdrive. Adding a 0.1 µF bypass capacitor near the V_CC pin further enhances transient rejection, making it suitable for automotive and industrial environments with switching noise or load dump events.