STM802BD

Overview

The STM802BD is an obsolete solenoid controller IC designed for switch-mode current regulation with in-rush and holding modes. It operates within a DC supply voltage range of 8 V to 35 V and features a built-in gate drive voltage clamp, logic-controlled enabling circuit, and digital in-rush timer. The device eliminates the need for external timing capacitors through internally trimmed oscillators. Key electrical parameters include a typical in-rush duration of 64 ms, a fixed in-rush-to-hold current ratio of 4.5, and a quiescent supply current of 0.9 mA at 9 V. It is housed in an 8-SOIC package.

Feature Summary

• Switch-mode current regulation with distinct in-rush (64 ms typ) and hold current phases
• Built-in gate drive voltage clamp (11 V typ) for external power MOSFET protection
• Logic-controlled enable input for precise on/off cycle management
• Internally trimmed timing oscillator requiring no external timing capacitors

Applications

• Solenoid control systems
• Valve actuation circuits
• Electromechanical relay drivers

Procurement Notes

The STM802BD is officially classified as an obsolete product by STMicroelectronics. Verification of availability should focus on surplus or distributor stock rather than direct manufacturing orders. The tube packaging contains 100 parts per tube. Ensure compatibility with legacy designs, as new production is not guaranteed.

Selection Notes

Select this component for applications requiring simple solenoid current limiting without external timing components. Verify that the system supply voltage remains between 8 V and 35 V DC. The device requires an external power MOSFET; ensure the selected MOSFET withstands the supply voltage and solenoid current. Note that the TST pin must remain floating during normal operation.

Part Context

The STM802BD belongs to the STM802 series of solenoid controllers. It is functionally identical to the STM802BDR, which uses tape-and-reel packaging instead of tubes. Both variants share the same -40 °C to +85 °C operating temperature range and SO-8 package footprint.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. As the product is obsolete, alternative solutions require manual design verification for pinout and electrical parameter compatibility.