Texas Instruments TPS3895PDRYT

Overview

TPS3895PDRYT from Texas Instruments is a single-channel, adjustable-voltage supervisor IC with push-pull output, designed for precise power-rail monitoring in space-constrained systems. It features a 500 mV fixed threshold (±1% over –40°C to 125°C), 0.2 µs enable-to-output propagation delay, 6 µA typical quiescent current, and operates from 1.7 V to 6.5 V supply. It is used to assert reset or enable signals to microcontrollers, FPGAs, and ASICs during power-up or brownout events.

For engineers reviewing the TPS3895PDRYT datasheet, TPS3895PDRYT pinout, TPS3895PDRYT application, or TPS3895PDRYT equivalent, key selection criteria include its ultra-small USON-6 (1.45 mm × 1.00 mm) package, active-high ENABLE logic, push-pull SENSE_OUT output compatible with VCC-level logic, capacitor-adjustable delay via CT pin, and guaranteed operation across automotive-grade temperature range.

Technical Context

The TPS3895PDRYT implements a precision comparator with 500 mV reference and 5 mV hysteresis to detect rising/falling voltage on the SENSE pin. Its ENABLE input directly controls output assertion with minimal 0.2 µs propagation delay-no external capacitor required for enable timing. Unlike A-versions, the P-version decouples enable response from CT-based delay, enabling fast system-level control independent of reset timeout configuration.

Internally, a 310 nA CT pin current source charges an external capacitor to set the SENSE-to-SENSE_OUT delay (tpd(r) = [CCT × 4] + 40 µs), while the SENSE pin accepts any voltage >500 mV via resistor divider for user-defined thresholds. The push-pull output drives high to VCC and low to <0.3 V at 0.5 mA sink, eliminating need for external pull-ups.

Key Specifications

Pinout & Package

TPS3895PDRYT is housed in a 6-pin USON (DRY) package measuring 1.45 mm × 1.00 mm × 0.5 mm, optimized for ultra-dense PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS3895PDRYT, TPS3895ADRYT offers matched enable/SENSE delay flexibility at the cost of slower enable response, while MAX6895TTA+T trades adjustability and precision for legacy compatibility and lower unit cost-neither provides the 0.2 µs enable speed or 1% accuracy of the TI device.

Availability

TPS3895PDRYT is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration monitoring, battery-powered sensor nodes, and automotive ADAS domain controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3895PDRYT 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 delivering analog, embedded processing, and connectivity solutions with deep expertise in power management and precision analog ICs.

The TPS389x family was developed to address demand for ultra-miniature, low-power supervisory ICs in portable, automotive, and industrial systems-emphasizing small size, high accuracy, and flexible timing control without sacrificing robustness.

FAQ

What is the minimum supply voltage required for TPS3895PDRYT to operate reliably?

The TPS3895PDRYT requires a minimum supply voltage of 1.7 V to ensure functional operation across its full temperature range. Below this, undervoltage lockout (UVLO) activates at 1.3 V to deassert output, and below the power-on reset threshold of 0.8 V, output behavior is undefined. For stable reset generation, maintain VCC ≥1.7 V with proper 0.1 µF local bypass capacitance.

How does the CT pin function in TPS3895PDRYT, and what capacitor value yields a 100 ms delay?

The CT pin in TPS3895PDRYT sets the SENSE-to-SENSE_OUT delay using an external capacitor to ground. Delay time follows tpd(r) = [CCT (µF) × 4] + 40 µs. To achieve 100 ms, solve 100,000 µs = (CCT × 4) + 40 → CCT ≈ 24.9 µF. A standard 22 µF X7R ceramic capacitor yields ~91.6 ms; use 27 µF for closer match. Avoid high-leakage dielectrics like Y5V.

Can TPS3895PDRYT monitor a 1.0 V rail, and how is the threshold configured?

Yes, TPS3895PDRYT can monitor a 1.0 V rail using an external resistor divider on the SENSE pin. With fixed internal 500 mV threshold, set R1/R2 = (1.0 V / 0.5 V) − 1 = 1. For example, R1 = R2 = 200 kΩ achieves 1.0 V trip point while drawing only 2.5 µA from the rail. Input bias current is <15 nA, so resistor values up to 1 MΩ introduce negligible error.

What is the maximum voltage the SENSE_OUT pin can drive in push-pull mode?

In push-pull mode, the SENSE_OUT pin of TPS3895PDRYT drives high to VCC and low to <0.3 V (at 0.5 mA sink). It cannot exceed VCC in high state. For interfacing to higher-voltage logic (e.g., 5 V MCU reset pin powered from separate rail), use a level-shifter or select open-drain variants (TPS3897PDRYT) with external 5 V pull-up.

Is TPS3895PDRYT pin-compatible with MAX6895, and are there layout considerations?

Yes, TPS3895PDRYT is pin-for-pin compatible with MAX6895 in the 6-pin USON package, sharing identical pinout (ENABLE, GND, SENSE, SENSE_OUT, CT, VCC). However, due to tighter 1% threshold accuracy and lower 6 µA ICC, thermal relief and grounding should follow TI's recommended layout: solid GND plane, 0.1 µF VCC bypass placed <2 mm from Pin 6, and CT trace kept short and远离 noisy signals.