STMicroelectronics TS985IJT

Overview

TS985IJT from STMicroelectronics is a single micropower, rail-to-rail input, push-pull output comparator operating from 1.8 V to 5 V supply, consuming only 14 µA typical supply current at 1.8 V and delivering 300 ns propagation delay with 100 mV overdrive. It features internal hysteresis, low output saturation voltage (≤80 mV at 1 mA sink), and is housed in a 6-bump CSP (1.2 × 0.8 mm) for space-constrained portable electronics.

For engineers reviewing the TS985IJT datasheet, TS985IJT pinout, TS985IJT application, or TS985IJT equivalent, key selection criteria include micropower operation under 1.8 V, sub-1 µs propagation delay across voltage range, rail-to-rail input common-mode range, push-pull output drive capability, and CSP package compatibility with high-density PCB layouts.

Technical Context

The TS985IJT implements a CMOS input stage with rail-to-rail common-mode input range extending from (VCC−) − 0.25 V to (VCC+) + 0.25 V at 25 °C, enabling direct sensing near supply rails. Its push-pull output stage delivers VOH ≥ 1.69 V and VOL ≤ 80 mV at 1 mA load, eliminating external pull-up resistors.

Internal hysteresis of 3 mV suppresses noise-induced oscillation without requiring external feedback components. The device maintains stable operation across −40 °C to +85 °C and exhibits 2 kV HBM ESD tolerance, supporting robust integration into battery-powered handheld systems.

Key Specifications

Pinout & Package

The TS985IJT is packaged in a 6-bump chip-scale package (CSP) measuring 1.2 mm × 0.8 mm with 400 µm pitch, optimized for ultra-compact PCB layouts in mobile and wearable devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-voltage micropower comparator applications.

Compared with TLV7011DBVR and MAX9021AUT+T, the TS985IJT uniquely combines sub-1 µs speed, true rail-to-rail input, push-pull output, and internal hysteresis in a 1.2 × 0.8 mm CSP-enabling smaller, simpler, and faster low-power threshold detection circuits.

Availability

TS985IJT is available at Aetrix Electronics and suitable for smartphone power management, wireless earbud battery protection, and portable medical glucose meters requiring stable component supply with long-term lifecycle support.

Supply support for TS985IJT 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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The TS985IJT belongs to ST's precision analog comparator product line, engineered specifically for ultra-low-power, space-constrained portable electronics where micropower operation, small footprint, and rail-to-rail functionality are mandatory.

FAQ

What is the maximum recommended PCB pad layout for the TS985IJT CSP package?

The TS985IJT uses a 6-bump CSP with 400 µm pitch and 0.23–0.29 mm bump diameter. ST recommends solder paste stencil apertures matching bump size (0.26 mm typ.), 0.15 mm thickness, and land pattern per DocID029328 Rev 2 Figure 33 - including thermal relief for GND and VCC bumps and non-solder-mask-defined (NSMD) pads for reliable reflow attachment.

Does the TS985IJT require external hysteresis for stable operation?

No. The TS985IJT integrates 3 mV of internal hysteresis, eliminating the need for external positive feedback resistors. This simplifies design, reduces component count, and ensures consistent noise immunity across temperature and supply voltage variations without tuning.

Can the TS985IJT drive capacitive loads above 15 pF?

Yes - while propagation delay is characterized at CL = 15 pF, the push-pull output can drive up to 50 pF with <1 µs delay increase. For loads >30 pF, add a series resistor (10–50 Ω) near the output to damp ringing and maintain clean edges without compromising stability.

Is the NC bump on the TS985IJT electrically isolated or tied internally?

The NC bump is fully electrically isolated - it has no internal connection to the die and must remain unconnected on the PCB. ST specifies it as "no-connect" in Table 6 and Figure 33; soldering or routing to this bump may cause mechanical stress or shorting risk due to its proximity to adjacent terminals.