STMicroelectronics STM6904SFEDS6F

Overview

STM6904SFEDS6F from STMicroelectronics is a quad ultralow-voltage supervisor IC for multi-rail power monitoring in industrial embedded systems. It monitors four supply rails-VCC (2.955 V fixed threshold), V2IN (1.050 V fixed), and two adjustable inputs (V3IN/V4IN referenced to 0.6 V)-with ±1.8% threshold accuracy across –40 to 85 °C, open-drain RST output guaranteed down to VCC ≥ 0.8 V, and user-selectable 210 ms reset timeout via TRSEL pin. Used in set-top boxes and multi-voltage computing systems.

For engineers reviewing the STM6904SFEDS6F datasheet, STM6904SFEDS6F pinout, STM6904SFEDS6F application, or STM6904SFEDS6F equivalent, key selection criteria include factory-trimmed dual fixed thresholds (2.955 V / 1.050 V), 0.6 V internal reference for external resistor-divider adjustment of V3IN/V4IN, 12 µA typical supply current, MSOP8/TSSOP8 package compatibility, and push-button MR input with 10 kΩ internal pull-up.

Technical Context

The device integrates four independent voltage comparators: two with factory-programmed thresholds (VCC at 2.955 V, V2IN at 1.050 V) and two with externally adjustable trip points using an internal 0.600 V reference and external resistor dividers. All comparators feed into a reset logic block that asserts active-low open-drain RST when any monitored voltage falls below its threshold or MR is pulled low.

Reset assertion is sustained for tREC = 210 ms (TRSEL tied to VSS), with guaranteed RST functionality down to VCC = 0.8 V. The MR input includes a 10 kΩ internal pull-up and supports direct switch connection without external debounce, while RST requires an external 10 kΩ pull-up to VCC for proper logic-level translation.

Key Specifications

Pinout & Package

Package: MSOP8 (TSSOP8), 3 × 3 mm, 0.65 mm pitch, RoHS-compliant ECOPACK® green package, industrial temperature range (–40 to 85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage supervisor applications.

Compared with TPS3307-33D and MAX6816CUA+, the STM6904SFEDS6F uniquely combines factory-trimmed dual thresholds (2.955 V / 1.050 V), two adjustable inputs with 0.6 V reference, and MSOP8 footprint-enabling verified quad-rail supervision with minimal external components and tighter voltage tolerance.

Availability

STM6904SFEDS6F is available at Aetrix Electronics and suitable for set-top boxes, multi-voltage industrial controllers, cable/satellite equipment, and data storage enclosures requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM6904SFEDS6F 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 microcontrollers, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The STM6904 belongs to ST's supervisor IC product line, engineered specifically for robust, low-power multi-rail voltage monitoring in cost-sensitive industrial and consumer electronics where reliability, small footprint, and factory-calibrated accuracy are critical.

FAQ

What is the exact reset threshold voltage for VCC and V2IN on STM6904SFEDS6F?

The STM6904SFEDS6F has factory-programmed reset thresholds of 2.955 V (VCC, falling edge, ±1.8% over –40 to 85 °C) and 1.050 V (V2IN, falling edge, ±1.8% over –40 to 85 °C), as confirmed in Table 1 and Table 4 of ST's Doc ID 14289 Rev 3. These values are laser-trimmed during production and marked as "SY" and "F" in the part number suffix.

Can V3IN and V4IN monitor voltages below 0.6 V?

No. V3IN and V4IN trip when the input voltage falls below the internal 0.600 V reference (589–611 mV range). They cannot reliably supervise voltages lower than this reference; attempting to do so results in undefined comparator behavior and potential failure to assert RST. For sub-0.6 V monitoring, a dedicated low-V_REF supervisor or external amplifier stage is required.

Is an external pull-up resistor required on the RST pin?

Yes. RST is an active-low open-drain output with no internal pull-up. An external 10 kΩ resistor to VCC is required for proper logic-level translation and bus interfacing. This is explicitly stated in Section 2.6 and Figure 4 of the datasheet; omission causes RST to float high and disable reset signaling.

How is the 210 ms reset timeout (tREC) selected and verified?

The 210 ms tREC is selected by tying the TRSEL pin to VSS (ground), as specified in Table 2 and Section 2.7. Verification is performed during final test: when all monitored supplies exceed their thresholds and MR returns high, RST remains low for 140–280 ms (min–max, per Table 4), with 210 ms being the typical value. TRSEL must never be left floating.