STMicroelectronics STM6315SDW13F

Overview

STM6315SDW13F 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 2.93 V (±1.8% at 25°C), with guaranteed RST assertion down to V_CC = 1.0 V, 210 ms reset timeout (t_rec), and operation across –40 to +125°C - used in industrial MCU power-up sequencing and brownout protection.

For engineers reviewing the STM6315SDW13F datasheet, STM6315SDW13F pinout, STM6315SDW13F application, or STM6315SDW13F equivalent, key selection criteria include reset threshold accuracy, open-drain output compatibility with higher-voltage logic rails, manual reset input with internal 63 kΩ pull-up, transient immunity against negative V_CC glitches, and SOT143-4 package suitability for space-constrained embedded designs.

Technical Context

The STM6315SDW13F implements a precision voltage comparator with factory-trimmed 2.93 V reset threshold, internal reset timer generating fixed 210 ms (–40 to +85°C) or 168 ms (–40 to +125°C) active-low pulse width, and debounced manual reset input with 1 µs minimum pulse width and 100 ns glitch rejection.

Its open-drain RST output supports external pull-up to any voltage ≤6 V independent of V_CC, enabling interoperability with mixed-supply systems; the device remains functional down to V_CC = 1.0 V and exhibits 60 ppm/°C reset threshold temperature coefficient for stable performance across automotive and industrial temperature ranges.

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 finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US29D3+T and TPS3808G18DBVR, the STM6315SDW13F uniquely combines 2.93 V threshold, integrated MR input with internal pull-up, and SOT143-4 footprint - making it optimal for space-constrained 3.3 V industrial systems requiring both supply and manual reset capability.

Availability

STM6315SDW13F is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, smart metering, and medical diagnostics requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned thermal robustness.

Supply support for STM6315SDW13F 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 STM6315 belongs to ST's supervisory IC product line, engineered specifically for high-accuracy, low-power reset generation in thermally demanding embedded systems where supply stability and deterministic boot behavior are critical.

FAQ

What is the exact reset threshold voltage and tolerance for STM6315SDW13F?

The STM6315SDW13F has a factory-trimmed reset threshold of 2.93 V with ±1.8% accuracy at 25°C, ±2.5% from –40°C to +85°C, and ±3.5% from –40°C to +125°C. This value is confirmed in Table 4 of the official ST datasheet (Rev 5, March 2007) and corresponds to the "S" suffix in the part number ordering code.

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 families (e.g., 5 V MCU reset inputs) while operating from a 3.3 V or lower supply, as explicitly stated in the Summary Description and Operation sections of the datasheet.

Does STM6315SDW13F include a manual reset input, and how is it implemented?

Yes - Pin 4 (MR) is a logic-low active manual reset input with an internal 63 kΩ pull-up resistor (typical), allowing direct connection to a push-button switch without external components. The datasheet specifies 1 µs minimum pulse width, 100 ns glitch rejection, and MR-to-RST delay of 500 ns, enabling robust operator-initiated resets in noisy environments.

What is the reset timeout duration (t_rec) and its temperature dependence?

The STM6315SDW13F provides a 210 ms reset timeout (t_rec) over –40°C to +85°C and 168 ms over –40°C to +125°C, as defined by the "D" suffix in the part number. Figure 10 in the datasheet shows normalized t_rec varies by ±4% across temperature, confirming tight timing consistency essential for reliable MCU boot sequencing.