STMicroelectronics TDE1898RFPT

Overview

TDE1898RFPT from STMicroelectronics is a monolithic high-side intelligent power switch in Multipower BCD technology, designed for driving inductive or resistive loads in industrial control systems. It delivers 0.5A output current, operates across 18V–35V supply voltage, integrates internal current limiting and thermal shutdown, and features differential inputs with ±7V to +15V common-mode range and 50–400mV input hysteresis.

For engineers reviewing the TDE1898RFPT datasheet, TDE1898RFPT pinout, TDE1898RFPT application, or TDE1898RFPT equivalent, this device supports robust load switching with open-load detection, dual diagnostic outputs (D1/D2), output status feedback, and fast demagnetization via internal −45V clamp (VS–VO) - critical for solenoid, relay, and valve driver designs requiring fault resilience and CPU-level diagnostics.

Technical Context

The TDE1898RFPT implements a high-side NDMOS power switch with integrated clamping diode (Vcl = 45–55V), enabling safe, external-diode-free demagnetization of inductive loads up to 200mJ at TJ = 85°C. Its differential input stage uses comparator-based logic with programmable hysteresis (50–400mV) and wide common-mode range (−7V to +15V relative to VS), allowing direct interface with noisy industrial field buses.

Diagnostic functionality includes two open-drain outputs: D1 signals short-to-VS and overtemperature events; D2 is omitted in TDE1898R (vs. TDE1897R), simplifying fault reporting for applications where cold-lamp inrush triggering is not required. Undervoltage lockout features dual thresholds (Vsth1 = 11V, Vsth2 = 15.5V) with 0.4–3V hysteresis to prevent erratic operation during brownout recovery.

Key Specifications

Pinout & Package

Package: SO20 (Small Outline 20-pin, 0.5mm pitch, body size 12.6×7.4mm). Thermal resistance: R_{th j-amb} = 90°C/W - requires minimal PCB copper area for full 0.5A operation at +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side intelligent power switch applications.

Compared with VNS3NV04PTR-E, TDE1898RFPT provides superior fault visibility (dual diagnostics + open-load) and higher current headroom; versus IPS1021HTR, it offers simpler analog interface and lower BOM cost at the expense of configurability and sensing precision.

Availability

TDE1898RFPT is available at Aetrix Electronics and suitable for industrial PLC output modules, solenoid drivers, motor starter interfaces, and factory automation I/O cards requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-4/6 immunity standards.

Supply support for TDE1898RFPT 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, specializing in power management, automotive ICs, and industrial control solutions with over 45 years of manufacturing excellence.

The TDE1898RFPT belongs to ST's Intelligent Power Switch (IPS) product line, engineered specifically for ruggedized industrial actuator control - emphasizing fault resilience, integrated protection, and simplified system-level design over raw performance metrics.

FAQ

What is the maximum inductive energy the TDE1898RFPT can safely absorb during demagnetization?

The TDE1898RFPT is rated for 200mJ maximum inductive energy absorption at junction temperature 85°C, enabled by its internal 45–55V clamp (VS–VO). This value assumes worst-case thermal conditions and defines the upper bound for L·I²/2 energy in solenoid or relay coils without external clamping components.

How does the TDE1898RFPT differ from the TDE1897R in diagnostic functionality?

The TDE1898RFPT omits the D2 diagnostic output present in TDE1897R, which in the latter signals cold-filament inrush or capacitive load activation of current limiting. TDE1898R uses only D1 for critical faults (short-to-VS, overtemperature, UVLO), simplifying interface logic where such transient detection is unnecessary.

Can the TDE1898RFPT drive a 24V, 500mA resistive load continuously at 85°C ambient?

Yes - in SO20 package (R_{th j-amb} = 90°C/W), the TDE1898RFPT sustains 0.5A at +85°C ambient when supplied with 24V, based on derating curve Fig.7. At 30V supply and worst-case parameters, maximum ambient drops to 73.5°C; adding minimal copper pour restores full rating.

What is the purpose of the differential input stage with hysteresis?

The differential input (Pins 7/8) rejects common-mode noise up to ±7V offset and provides 50–400mV hysteresis to prevent false triggering from slow-rising or EMI-corrupted control signals - essential for reliable operation in electrically noisy factory environments with long cable runs.