Texas Instruments TPS3897ADRYT

Overview

TPS3897ADRYT from Texas Instruments is a single-channel, adjustable-voltage supervisory circuit in a 1.45 mm × 1.00 mm USON-6 package, featuring an open-drain output rated to 18 V, 1% threshold accuracy over –40°C to 125°C, and capacitor-adjustable delay time down to 40 µs. It monitors system supply rails (e.g., 3.3 V or 5 V) via external resistor divider on the SENSE pin and asserts reset after user-defined delay when voltage exceeds 500 mV.

For engineers reviewing the TPS3897ADRYT datasheet, TPS3897ADRYT pinout, TPS3897ADRYT application, or TPS3897ADRYT equivalent, key selection criteria include its ultra-small footprint for space-constrained portable designs, open-drain interface compatibility with mixed-voltage systems up to 18 V, low 6 µA quiescent current for battery-powered operation, and precise 500 mV base threshold with ±5 mV hysteresis.

Technical Context

The TPS3897ADRYT implements a precision comparator with internal 500 mV reference and 5 mV hysteresis, enabling accurate monitoring of voltages ≥500 mV via external resistor divider. Its active-high ENABLE pin allows synchronous control by host logic, while the CT pin accepts an external capacitor (0–47 nF) to set delay from 40 µs to 190 ms per t_pd(r) = [C_CT (µF) × 4] + 40 µs.

It operates across 1.7 V–6.5 V supply range with 6 µA typical ICC and features undervoltage lockout (UVLO) at 1.3–1.7 V and power-on reset (POR) at 0.8 V. The open-drain SENSE_OUT supports level-shifting to 18 V independent of VCC, requiring external pullup but enabling interoperability with higher-voltage logic domains.

Key Specifications

Pinout & Package

TPS3897ADRYT uses a 6-pin USON (DRY) package measuring 1.45 mm × 1.00 mm × 0.5 mm, optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3897PDRYT, the TPS3897ADRYT offers design flexibility through user-configurable delay but trades off minimal enable latency; versus MAX6897TTA+T, it delivers superior board-area efficiency and threshold adaptability at the cost of non-drop-in replacement due to different package and pinout.

Availability

TPS3897ADRYT is available at Aetrix Electronics and suitable for portable electronics, industrial embedded controllers, and automotive infotainment modules requiring stable component supply with guaranteed long-term availability.

Supply support for TPS3897ADRYT 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, with decades of expertise in power management and precision analog ICs.

The TPS389x family was designed specifically for ultra-compact, low-power voltage supervision in space- and energy-constrained applications such as wearables, IoT edge nodes, and automotive body electronics.

FAQ

What is the minimum detectable voltage threshold for TPS3897ADRYT?

The TPS3897ADRYT has a fixed internal reference of 500 mV ±5 mV, enabling precise monitoring of any supply rail ≥500 mV. Using an external resistor divider on the SENSE pin, users can scale higher voltages (e.g., 3.3 V, 5 V, or 12 V) down to this threshold. For example, a 100 kΩ/100 kΩ divider on a 3.3 V rail yields exactly 1.65 V at SENSE - well above the 500 mV trip point - ensuring robust detection even with resistor tolerance and temperature drift.

How does the CT pin configure delay time in TPS3897ADRYT?

The CT pin on TPS3897ADRYT connects to an external capacitor (0–47 nF) referenced to GND. An internal 310 nA current source charges this capacitor until it reaches 1.24 V, triggering SENSE_OUT assertion. Delay time follows t_pd(r) = [C_CT (µF) × 4] + 40 µs - e.g., a 10 nF capacitor yields ~80 µs delay. Leaving CT open defaults to 40 µs. Ceramic capacitors are recommended to minimize leakage-induced timing error.

Can TPS3897ADRYT interface with a 12 V logic system?

Yes, TPS3897ADRYT's open-drain SENSE_OUT is rated to 18 V and operates independently of VCC, allowing direct connection to 12 V logic domains. A pullup resistor (e.g., 10 kΩ to 12 V) is required. When SENSE > 500 mV and ENABLE is high, SENSE_OUT pulls low; otherwise it remains high-impedance. This eliminates level shifters and supports mixed-voltage system architectures common in industrial controls.

What is the purpose of the ENABLE pin in TPS3897ADRYT?

The ENABLE pin on TPS3897ADRYT is an active-high digital input that gates reset assertion. When ENABLE is low, SENSE_OUT is forced low immediately - overriding SENSE voltage state. When ENABLE is high and SENSE exceeds 500 mV, SENSE_OUT asserts high after the CT-programmed delay. This enables coordinated system-level power sequencing, such as delaying reset assertion until auxiliary supplies stabilize or firmware releases a hardware lock.

Does TPS3897ADRYT support operation below 1.7 V supply?

No - TPS3897ADRYT requires VCC between 1.7 V and 6.5 V per datasheet specifications. Below 1.7 V, the device enters undervoltage lockout (UVLO) at 1.3–1.7 V and ceases reliable operation. At VCC < 0.8 V (power-on reset threshold), output behavior becomes undefined. For sub-1.7 V applications, consider TI's TPS380x series or alternative low-V_CC supervisors explicitly rated down to 0.8 V.