STMicroelectronics TDE1898CFPT

Overview

TDE1898CFPT 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 from 18V to 35V supply, integrates internal current limiting, thermal shutdown, open-ground protection, and differential inputs with ±7V to +15V common-mode range - enabling robust operation in noisy factory environments.

For engineers reviewing the TDE1898CFPT datasheet, TDE1898CFPT pinout, TDE1898CFPT application, or TDE1898CFPT equivalent, key selection criteria include its 45V internal negative-voltage clamp for fast demagnetization, dual diagnostic outputs (D1/D2), open-load detection threshold (1–6 mA), and SO20 package thermal resistance of 90°C/W - all critical for PLC output stage and solenoid driver design.

Technical Context

The TDE1898CFPT implements a protected NDMOS high-side switch with integrated clamping diode (V_CL = 45–55 V), enabling safe energy dissipation during inductive load turn-off. Its differential input stage features programmable hysteresis (50–400 mV) and wide common-mode range (–7 V to +15 V), supporting direct connection to microcontroller GPIOs or isolated digital signals without external level-shifting.

Two dedicated diagnostic outputs provide real-time status: D1 indicates overtemperature, undervoltage, or short-to-VS; D2 signals open-load condition (TDE1897C only). The device uses internal thermal shutdown at 135°C (±15°C hysteresis) and employs junction-temperature-dependent R_DS(on) derating (α = 1.6× at 125°C vs. 25°C) to ensure safe continuous conduction under ambient up to +85°C.

Key Specifications

Pinout & Package

Supplied in SO20 surface-mount package (12.6 mm × 7.4 mm, 1.27 mm pitch), the TDE1898CFPT features thermally enhanced layout with exposed die pad connected to Pin 1 (GND) for improved heat transfer. Package thermal resistance is R_{th j-amb} = 90°C/W (max), suitable for PCB copper pour cooling in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VNS1NV04PTR and IPS1021HTR, the TDE1898CFPT uniquely balances diagnostic richness (dual open-drain flags), industrial-grade voltage margin (35 V supply), and SO20 thermal performance - making it optimal for mid-channel-count PLC output stages where reliability and serviceability outweigh raw current density.

Availability

TDE1898CFPT is available at Aetrix Electronics and suitable for PLC digital output modules, industrial solenoid drivers, and factory I/O terminal blocks requiring stable component supply across extended product lifecycles.

Supply support for TDE1898CFPT 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 automotive, industrial, and power management ICs with vertical manufacturing capabilities.

The TDE1898CFPT belongs to ST's Intelligent Power Switch (IPS) product line, engineered specifically for ruggedized industrial control applications demanding integrated protection, diagnostics, and high-voltage tolerance in harsh electromagnetic environments.

FAQ

What is the function of Pins 5 and 6 (D1 and D2) on the TDE1898CFPT?

Pins 5 and 6 are open-drain diagnostic outputs referenced to VS. D1 signals combined faults including overtemperature, undervoltage, short-to-VS, and short-to-ground. D2 is not used in the TDE1898C variant (unlike TDE1897C, where D2 indicates open-load condition). Both sink up to 3 mA with <1.5 mV drop at 0.5 mA, enabling direct µP polling without external pull-ups.

Can the TDE1898CFPT drive a 24 V, 1 A solenoid?

No - the TDE1898CFPT is rated for 0.5 A continuous output current and internally limits short-circuit current to 0.75–1.5 A. Driving a 1 A solenoid would trigger current limiting and thermal shutdown. For 1 A loads, consider ST's IPS1021HTR (1.2 A rated) or parallel configuration with current-sharing design - but note that parallel operation is not supported by default due to mismatched turn-on thresholds.

How does the internal clamp diode affect PCB layout for inductive loads?

Because the internal clamp diode connects VS to OUT with 45–55 V breakdown, no external flyback diode is needed. Layout must minimize loop area between VS, OUT, and load to reduce EMI from clamp conduction. A 100 nF ceramic capacitor placed near Pins 2/3 (OUT/VS) suppresses high-frequency ringing during demagnetization, especially critical for solenoids with >100 mH inductance.

Is the TDE1898CFPT compliant with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (Surge)?

The TDE1898CFPT incorporates system-level protections validated per IEC 61000-4-4 Level 4 (4 kV burst) and IEC 61000-4-5 Level 3 (2 kV line-earth surge) when used with recommended external filtering (100 nF X7R + 10 Ω series resistor on VS line). Its internal negative-voltage clamp (VS–VO ≤ –45 V) and open-ground detection directly address surge-induced ground lift scenarios in industrial installations.