STMicroelectronics STM6315RBW13F

Overview

STM6315RBW13F 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, t_rec = 30 ms (–40 to +85°C), and operation across –40 to +125°C - used in industrial MCU power-up sequencing and brown-out protection.

For engineers reviewing the STM6315RBW13F datasheet, STM6315RBW13F pinout, STM6315RBW13F application, or STM6315RBW13F equivalent, this page delivers verified technical context, SOT143-4 package mapping, reset timing behavior under transient conditions, manual reset debounce characteristics, and real-world design implications for reliable system initialization.

Technical Context

The STM6315RBW13F implements a precision voltage comparator with factory-trimmed 2.63 V threshold and internal 30 ms reset timeout timer (t_rec), where RST remains asserted until V_CC rises above VRST and sustains for ≥30 ms. Its open-drain output supports pull-up to voltages up to 6 V, independent of V_CC, enabling level-shifted reset signaling in multi-rail systems.

It features a TTL/CMOS-compatible manual reset input (MR) with 63 kΩ internal pull-up, 1 µs minimum pulse width support, and 100 ns glitch rejection; negative-going V_CC transients are suppressed per Figure 12, with immunity dependent on overdrive magnitude and duration - validated down to –40°C and up to +125°C.

Key Specifications

Pinout & Package

SOT143-4 (W1) package: 4-pin, small-outline transistor outline with gull-wing leads, 1.92 mm pitch, 2.8 mm × 2.1 mm body size, and ECOPACK® lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD+T and TPS3808G33DBVR, the STM6315RBW13F uniquely combines 2.63 V precision threshold, 30 ms fixed timeout, open-drain output for rail-flexible reset signaling, MR input with internal pull-up, and guaranteed RST validity down to 1.0 V - making it optimal for cost-sensitive, high-reliability industrial and automotive reset supervision where voltage margin and manual intervention are critical.

Availability

STM6315RBW13F is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive BCM brown-out protection, and medical infusion pump safety logic requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM6315RBW13F 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 sensor solutions for industrial, automotive, and consumer markets.

The STM63xx series is ST's dedicated family of micropower reset supervisors targeting high-accuracy, wide-temperature, and low-quiescent-current applications in mission-critical embedded systems where deterministic power-on reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage and tolerance for STM6315RBW13F?

The STM6315RBW13F has a factory-trimmed reset threshold of 2.63 V with ±1.8% accuracy at 25°C. Over the full operating temperature range (–40°C to +125°C), the tolerance widens to ±3.5%, and the temperature coefficient is 60 ppm/°C - confirmed in Table 4 of the official datasheet revision 5 (March 2007).

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

Yes - the RST pin is an active-low open-drain output rated for pull-up voltages up to 6 V, regardless of V_CC level. This allows interfacing with higher-voltage logic domains (e.g., pulling RST to 5 V while V_CC = 3.3 V), provided the external pull-up resistor value is selected to meet sink current and logic threshold requirements.

Does STM6315RBW13F support manual reset, and how is it implemented?

Yes - the MR pin provides active-low manual reset with internal 63 kΩ pull-up. Driving MR below 0.3V_CC (or 0.8 V if VRST > 4.0 V) asserts RST for t_rec (30 ms) after MR returns high. No external components are needed for basic operation; a 0.1 µF capacitor to V_SS is recommended in noisy environments per Section 2.2.

What is the minimum V_CC at which RST remains valid and actively driven?

RST is guaranteed to assert and remain valid down to V_CC = 1.0 V. Below 1.0 V, the output transitions to high-impedance (open circuit), though most MCUs cease operation well above this point. For applications requiring RST validity down to 0 V, a 100 kΩ pull-down resistor is recommended per Section 2.4.