STMicroelectronics STEVAL-IFP008V1

Overview

STEVAL-IFP008V1 from STMicroelectronics is a demonstration board for the CLT3-4B quadruple current-limited logic input termination IC, designed for 24 VDC sensor and mechanical switch interfaces in PLCs, PACs, and distributed I/O systems. It features four independent input channels, integrated fixed current limiting (12 mA per channel), optocoupler-based isolated outputs, and operation across –40 °C to +125 °C with supply voltage range 10–30 VDC.

For engineers reviewing the STEVAL-IFP008V1 datasheet, STEVAL-IFP008V1 pinout, STEVAL-IFP008V1 application, or STEVAL-IFP008V1 equivalent, this board enables rapid validation of IEC61131-2 Type 1/3 digital input compliance, low-power VI characteristic optimization, and ESD-protected industrial signal conditioning in IP65/IP67-enclosed automation cabinets.

Technical Context

The board implements the CLT3-4B TSSOP20 device with internal series resistors and protection diodes on each input and supply line, enabling robust immunity against fast transients and electrostatic discharge per IEC61000-4-2 (±8 kV contact) and IEC61000-4-4 (±2 kV). Each channel delivers precise 12 mA current limitation without external components, reducing power dissipation in sealed enclosures where convection cooling is absent.

Output isolation uses a TLP281-4 quad phototransistor optocoupler, providing 5000 V_RMS reinforced insulation and 10 kV/μs common-mode transient immunity. The board's passive RC network (R_in = 1.8 kΩ, C = 22 nF per channel) shapes input filtering to meet IEC61131-2 Type 1 (fast response) and Type 3 (noise-immune) thresholds simultaneously.

Key Specifications

Availability

STEVAL-IFP008V1 is available at Aetrix Electronics and suitable for factory automation PLC interface validation, distributed I/O module prototyping, and IEC61131-2 compliance testing requiring stable component supply and documented reference design implementation.

Supply support for STEVAL-IFP008V1 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, delivering microcontrollers, analog ICs, power devices, and sensors for industrial, automotive, and consumer applications.

The STEVAL-IFP008V1 belongs to ST's Industrial Interface Evaluation Board product line, developed specifically to accelerate adoption of IEC61131-2-compliant digital input solutions in harsh, high-reliability automation environments.

FAQ

Is STEVAL-IFP008V1 still in active production?

No - STEVAL-IFP008V1 is marked as Obsolete by STMicroelectronics per its July 2008 data brief. However, Aetrix Electronics maintains legacy inventory and offers technical documentation, schematic files, and BOM support for maintenance and replacement of installed systems in industrial facilities.

Can STEVAL-IFP008V1 be used with 12 VDC input signals?

Yes - the CLT3-4B IC on the board supports 10–30 VDC supply, and its VI characteristic is optimized for 24 V nominal operation but remains functional down to 10 V. At 12 V, input threshold behavior shifts slightly but retains IEC61131-2 Type 3 noise immunity due to internal hysteresis and RC filtering.

What is the purpose of the 1.8 kΩ resistors (Rin1–Rin4) on the input side?

These resistors form part of the input RC filter (with 22 nF capacitors) that sets the time constant for noise suppression and defines the transition speed between logic states. They ensure compliance with IEC61131-2 Type 1 (fast) and Type 3 (slow, noise-immune) input timing requirements without requiring external configuration.

Does the board provide surge protection beyond ESD?

No - STEVAL-IFP008V1 includes only ESD protection diodes (ESD12, ESD34, ESD_C) rated per IEC61000-4-2. It does not integrate TVS diodes or gas discharge tubes for higher-energy surges (e.g., IEC61000-4-5). External surge suppression must be added upstream for field wiring exposed to lightning-induced transients.