STMicroelectronics TDE1897RFPT

Overview

TDE1897RFPT 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 ±43V common-mode range and hysteresis for noise immunity - used in PLC output modules and motor actuator drivers.

For engineers reviewing the TDE1897RFPT datasheet, TDE1897RFPT pinout, TDE1897RFPT application, or TDE1897RFPT equivalent, key selection criteria include its open-load detection capability (0.5–9.5mA threshold), dual diagnostic outputs (Diag1/Diag2), internal clamping diode (VS–VO ≤ 45V), and SIP9 package thermal resistance (R_{th j-amb} = 70°C/W) enabling full 500mA operation up to +85°C ambient.

Technical Context

The TDE1897RFPT implements a high-side NDMOS power switch with integrated protection logic, including undervoltage lockout (V_sth1 = 11V, V_sth2 = 15.5V, hysteresis ≥0.4V), open-ground detection, and negative voltage clamping to VS – 45V. Its differential input stage supports wide common-mode range (–7V to +15V) and 50–400mV input hysteresis for robust signal acquisition in noisy industrial environments.

Two dedicated diagnostic outputs provide real-time status: Diag1 signals short-to-VS, overtemperature, and undervoltage; Diag2 distinguishes open-load and short-to-ground conditions (TDE1897-specific). The device uses internal current limiting (I_sc = 0.75–1.5A) and thermal shutdown (Θ_Lim = 135°C, hysteresis = 30°C) to ensure fault containment without external circuitry.

Key Specifications

Pinout & Package

The TDE1897RFPT is housed in a 9-pin SIP (Single In-line Package) with gull-wing leads, optimized for through-hole mounting and industrial PCB layouts. Thermal resistance is R_{th j-amb} = 70°C/W, enabling full-rated current delivery without heatsinking in ambient temperatures up to +85°C.

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 IPS1032HTR, the TDE1897RFPT uniquely balances 0.5A drive capability, differential input noise immunity, dual independent diagnostics, and SIP9 thermal performance - making it optimal for legacy-compatible industrial I/O where minimal firmware changes and proven reliability are critical.

Availability

TDE1897RFPT is available at Aetrix Electronics and suitable for PLC output modules, industrial solenoid drivers, motor brake controllers, and DC power distribution units requiring stable component supply across extended product lifecycles.

Supply support for TDE1897RFPT 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 solutions with vertical manufacturing capabilities.

The TDE1897RFPT belongs to ST's Intelligent Power Switch (IPS) family, engineered specifically for rugged industrial control applications demanding integrated protection, diagnostic visibility, and high-voltage bus compatibility.

FAQ

What is the maximum inductive energy the TDE1897RFPT can safely absorb during demagnetization?

The TDE1897RFPT is rated for 200mJ maximum energy absorption from inductive loads at junction temperature of 85°C. This value is validated under worst-case conditions using the internal clamp diode (V_cl = 45–55V) and accounts for thermal derating. Exceeding this limit risks cumulative thermal stress and premature failure, especially in high-frequency switching applications.

How does the differential input stage improve noise immunity in industrial environments?

The TDE1897RFPT's differential input accepts signals across a –7V to +15V common-mode range relative to VS, rejecting noise coupled equally onto both +IN and –IN pins. With 50–400mV hysteresis and 150–400kΩ input resistance, it maintains clean switching thresholds even with >10Vpp common-mode transients typical in 24V PLC field wiring.

Can the TDE1897RFPT drive an LED indicator directly from the OS pin?

Yes - the OUTPUT STATUS (OS) pin sources 2–4mA at V_osd ≤ 5V drop (VS – V_os) when active, sufficient to drive standard 2mA red/green LEDs. For higher-brightness or multi-LED configurations, an external transistor buffer is recommended to avoid loading the internal current source beyond its 4mA specification.

What distinguishes Diag1 and Diag2 behavior during open-load conditions?

During open-load (I_out < 0.5mA), Diag1 remains HIGH while Diag2 goes LOW - a unique signature for TDE1897 devices. This two-bit code differentiates open-load from short-to-ground (Diag1 LOW, Diag2 HIGH) and short-to-VS (both LOW), enabling unambiguous fault identification without additional sensing circuitry.