STMicroelectronics STM6315RDW13F

Overview

STM6315RDW13F 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, 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 STM6315RDW13F datasheet, STM6315RDW13F pinout, STM6315RDW13F application, or STM6315RDW13F 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 footprint suitability for space-constrained embedded designs.

Technical Context

The STM6315RDW13F implements a precision voltage comparator with factory-trimmed 2.63 V threshold, internal reset timer generating fixed 210 ms (–40 to +85°C) or 112–336 ms (–40 to +125°C) active-low RST pulse width, and debounced manual reset input (MR) 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 level-shifting in mixed-supply systems; the device remains functional down to V_CC = 1.0 V and draws only 1.5 µA typical supply current at 25°C with no load.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US26D3+T and TPS3808G18DBVR, the STM6315RDW13F uniquely combines 2.63 V precision threshold, integrated MR pull-up, open-drain RST with 6 V tolerance, and guaranteed 1.0 V operation - making it optimal for industrial and automotive brownout supervision where voltage margin and interface flexibility are critical.

Availability

STM6315RDW13F is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM6315RDW13F 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM63xx series is ST's dedicated family of ultra-low-power reset supervisors targeting high-reliability embedded systems where precision voltage monitoring, wide temperature operation, and minimal board footprint are essential.

FAQ

What is the function of the MR pin on STM6315RDW13F?

The MR (Manual Reset) pin is an active-low input that forces the RST output low when pulled to ground. It features an internal 63 kΩ pull-up resistor, allowing direct connection of a momentary switch between MR and V_SS without external components. The device holds RST low for the full reset timeout period (210 ms) after MR returns high, and rejects glitches shorter than 100 ns.

Can the RST output be pulled up to 5 V while V_CC is 3.3 V?

Yes - the RST pin is an open-drain output rated for voltages up to 6 V, independent of V_CC. This allows direct connection to a 5 V pull-up resistor while V_CC operates at 3.3 V, enabling level translation in mixed-voltage systems without additional circuitry.

What is the minimum V_CC at which RST remains valid?

RST is guaranteed to assert and remain valid down to V_CC = 1.0 V. Below this voltage, the output transitions to high-impedance (open circuit). For applications requiring RST to stay low down to 0 V, a 100 kΩ pull-down resistor from RST to V_SS is recommended.

How does the STM6315RDW13F handle power supply transients?

The device provides inherent immunity to negative-going V_CC transients: Figure 12 in the datasheet shows it tolerates ≤100 µs glitches with ≤200 mV overdrive without generating spurious resets. Adding a 0.1 µF bypass capacitor near the V_CC pin further enhances noise rejection in electrically noisy environments.