Texas Instruments TPS26613DDFR

Overview

TPS26613DDFR from Texas Instruments is a universal ±20 mA / 4–20 mA current loop protector IC for analog input modules, featuring ±50-V operating voltage, 7.5-Ω typical R_ON, fixed ±32-mA bipolar current limit, auto-retry fault response, and integrated SGOOD health monitoring. It protects against IN/OUT miswiring and supports loop testing without external ±V_s supplies in industrial PLC analog input channels.

For engineers reviewing the TPS26613DDFR datasheet, TPS26613DDFR pinout, TPS26613DDFR application, or TPS26613DDFR equivalent, key selection criteria include its auto-retry behavior (vs. latch-off), absence of EN pin, loop-power-mode capability, ±50-V miswiring tolerance, and compatibility with HART-compliant 4–20 mA sensor interfaces requiring low-leakage (<0.1 µA) and low-drop operation.

Technical Context

The TPS26613DDFR implements a bidirectional pass-FET architecture with integrated current-sense amplifier, fast-trip comparator (5 µs response), and configurable MODE pin that selects between standard I_OL, 2×I_OL, or extended-duration overload timing. It operates from unipolar (3–30 V) or bipolar (±2.25–±20 V) supplies and enters loop-power mode when ±V_s are absent-enabling field diagnostics without system power.

Unlike TPS26611/TPS26614, it lacks an EN pin and instead uses VSNS for supply sensing; unlike TPS26610, it provides auto-retry (t_RETRY1 = 0.8 s, t_RETRY2 = 1.6 s) rather than latch-off on overload. Its OUT undervoltage protection (V_{O_UVLO} = –V_s – 0.4 V) and absence of IN undervoltage cutoff distinguish it from TPS26610/11/12.

Key Specifications

Pinout & Package

TPS26613DDFR is housed in an 8-pin SOT-23-THN (DDF) package measuring 2.9 mm × 1.6 mm, optimized for space-constrained industrial I/O modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current loop protection applications.

Compared with TPS26610DDFR, TPS26613DDFR offers autonomous recovery from overloads-reducing maintenance overhead in distributed I/O-but lacks latch-off for fail-safe shutdown. Compared with TPS26614DDFR, it saves one GPIO (no EN) and simplifies layout, at the cost of losing input-side undervoltage detection.

Availability

TPS26613DDFR is available at Aetrix Electronics and suitable for factory automation, motor drive feedback, and HVAC controller designs requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceability.

Supply support for TPS26613DDFR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.

The TPS2661x family was designed specifically for robust current-loop protection in industrial process automation-addressing miswiring, surge, EFT, and HART signal integrity challenges in PLC analog I/O modules and sensor interfaces.

FAQ

What is the primary function of the TPS26613DDFR in a 4–20 mA analog input circuit?

The TPS26613DDFR serves as a fully integrated current loop protector in 4–20 mA analog input circuits, providing bidirectional ±32 mA current limiting, ±50 V miswiring tolerance, auto-retry fault recovery, and loop-power-mode operation. It replaces discrete protection components while ensuring HART signal transparency and sub-100 nA loop leakage-directly preserving measurement accuracy and system reliability in industrial PLC modules.

Does the TPS26613DDFR support HART communication, and what is its bandwidth?

Yes, the TPS26613DDFR is HART-compliant with a 10 kHz small-signal bandwidth, verified under ±25 mA input conditions with 1 mApp excitation at 1 kΩ load. This ensures full transparency for 1200-baud FSK HART digital signals superimposed on the 4–20 mA analog current, enabling configuration and diagnostics without interrupting process measurement.

How does the TPS26613DDFR differ from the TPS26610DDFR in fault handling?

The TPS26613DDFR implements auto-retry fault recovery with two-stage timers (0.8 s and 1.6 s), whereas the TPS26610DDFR latches off permanently until manually reset. Both share identical pinout, R_ON, and loop-power-mode capability, but TPS26613DDFR's autonomous recovery is essential for unattended field nodes, while TPS26610DDFR suits safety-critical applications requiring explicit operator acknowledgment.

What supply configurations does the TPS26613DDFR support, and what are the voltage ranges?

The TPS26613DDFR supports unipolar supplies (3–30 V on +Vs, –Vs tied to GND) and bipolar supplies (±2.25–±20 V on +Vs/–Vs). It tolerates ±50 V on IN/OUT terminals regardless of supply configuration and draws only 1.07–1.65 mA from +Vs in normal operation-enabling use in low-power and wide-input-range industrial systems.

What protection features does the TPS26613DDFR provide against wiring faults?

The TPS26613DDFR provides comprehensive wiring-fault protection: ±50 V absolute maximum rating on IN/OUT pins, output overvoltage lockout (V_{OUT_OVLO} = +V_s + 0.05 V), output undervoltage lockout (V_{O_UVLO} = –V_s – 0.4 V), fast-trip response (5 µs) to short circuits, and thermal shutdown at 160 °C. It also blocks reverse current in unipolar 4–20 mA configurations when –Vs is grounded.