STMicroelectronics IPS161HTR

Overview

IPS161HTR from STMicroelectronics is a monolithic 60 V, 60 mΩ single high-side switch optimized for industrial I/O protection and diagnostics, featuring 0.7 A output current limitation (typ.), fast active-clamp demagnetization for inductive loads, non-dissipative cut-off protection with programmable delay via external capacitor, and integrated open-load-in-off-state, thermal shutdown, and undervoltage lock-out detection. It is used in PLC digital output modules driving solenoids, valves, and relays.

For engineers reviewing the IPS161HTR datasheet, IPS161HTR pinout, IPS161HTR application, or IPS161HTR equivalent, key selection considerations include its PowerSSO12 package thermal performance (Rth(JA) = 29 °C/W with 4 thermal vias), diagnostic open-drain DIAG pin behavior under fault conditions, cut-off delay configurability (50 × CCoD ±35%), and compliance with IEC 61131-2 for safety-critical industrial control.

Technical Context

The IPS161HTR implements a high-side power switch with integrated logic interface, active V_DS clamp for fast inductive load demagnetization (V_demag = V_CC − 68.5 V typ.), and multi-level protection including current-limit-triggered cut-off (t_coff programmable), junction thermal shutdown (T_JSD = 150–190 °C), and GND/V_CC disconnection detection. Its IN pin accepts TTL/CMOS-compatible logic (V_IL ≤ 0.8 V, V_IH ≥ 2.2 V) with internal weak pull-down.

Diagnostic reporting is consolidated on the open-drain DIAG pin, which asserts low during open load (off-state), cut-off, or thermal shutdown-regardless of IN state-and requires an external pull-up. The CoD pin enables precise cut-off timing control (10–100 nF range) or full disablement via 1 kΩ resistor to GND, while NC pins (5, 6) must remain unconnected.

Key Specifications

Pinout & Package

IPS161HTR is housed in a thermally enhanced PowerSSO12 package with exposed V_CC-connected thermal pad (TAB), supporting up to 2.2 W power dissipation when mounted with 4 thermal vias (R_th(JA) = 29 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VNS16NV04PTR-E and TPS27081AQPWRQ1, the IPS161HTR uniquely combines programmable cut-off, open-load-in-off-state detection, and active demagnetization in a single IC - making it the only option among the three qualified for SIL-targeted PLC output stages requiring deterministic fault handling and minimal external components.

Availability

IPS161HTR is available at Aetrix Electronics and suitable for programmable logic control, industrial PC peripheral I/O, and numerical control machine applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.

Supply support for IPS161HTR 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The IPS161HTR belongs to ST's industrial high-side switch product line, engineered specifically for robust, diagnostic-rich digital output stages in programmable controllers and automation equipment compliant with IEC 61131-2.

FAQ

What is the maximum continuous output current supported by the IPS161HTR?

The IPS161HTR guarantees a minimum output current limitation of 0.7 A under all operating conditions (8–60 V, −40 to 125 °C). Its typical R_DS(on) of 60 mΩ results in <30 mW conduction loss at 0.7 A, enabling reliable continuous operation within thermal limits of the PowerSSO12 package when properly heatsinked.

How does the CoD pin function, and what happens if left unconnected?

The CoD pin must never be left floating: it programs cut-off delay time using an external capacitor (10–100 nF) or disables cut-off entirely when pulled to GND via a 1 kΩ resistor. If left unconnected, internal leakage may cause unpredictable cut-off timing or failure to enter cut-off mode, violating IEC 61131-2 fault-response requirements.

Can the IPS161HTR drive inductive loads without an external flyback diode?

Yes - the IPS161HTR integrates an active V_DS clamp that pulls OUT to V_demag ≈ V_CC − 68.5 V during turn-off, enabling fast demagnetization of inductive loads up to 2.5 A·ms (e.g., 1 mH @ 2.5 A) without external diodes. For higher energy demands, an external Schottky diode is required but disables active clamping.

What diagnostic states are reported on the DIAG pin, and how is the signal interpreted?

The DIAG pin is an open-drain output that pulls low during three distinct fault conditions: open load in off-state (IN = LOW), cut-off activation (overload), or junction thermal shutdown. It remains low until the fault clears - e.g., load reconnection, reset after t_res, or junction cooling below T_JSD − T_JHYST. An external pull-up resistor (typically 4.7 kΩ to V_CC) is mandatory for proper logic-level interpretation.