Texas Instruments TLV4021R1YKAR

Overview

TLV4021R1YKAR from Texas Instruments is a precision, low-power comparator with integrated 1.2 V reference, non-inverting input configuration, and open-drain output. It operates from 1.6 V to 5.5 V, delivers 360 ns propagation delay, 2 µA quiescent current, and ±0.5% reference accuracy at 25°C - enabling accurate voltage monitoring in space-constrained battery-powered systems such as lithium-ion protection circuits.

For engineers reviewing the TLV4021R1YKAR datasheet, TLV4021R1YKAR pinout, TLV4021R1YKAR application, or TLV4021R1YKAR equivalent, key selection criteria include its factory-trimmed 1.2 V threshold (±0.5% @ 25°C), ultra-small 0.73 mm × 0.73 mm DSBGA package, precision hysteresis (20 mV), and guaranteed startup behavior via internal POR circuit.

Technical Context

The TLV4021R1YKAR implements a rail-to-rail input stage comparing an external signal against a factory-trimmed 1.2 V internal reference, with separate positive-going (VIT+ = 1.2 V) and negative-going (VIT− = 1.18 V) thresholds. Its open-drain output supports flexible pull-up voltage selection and wired-OR logic, while the built-in 20 mV hysteresis rejects noise on slow-moving inputs.

It features a dedicated Power-on Reset (POR) circuit that holds the output in high-impedance state until supply voltage exceeds 1.45 V, ensuring deterministic startup. The device is specified for operation across –40°C to +125°C and maintains reference accuracy within ±1% over this full temperature range.

Key Specifications

Pinout & Package

TLV4021R1YKAR uses the YKA 4-bump DSBGA package (0.73 mm × 0.73 mm, 0.35 mm pitch), optimized for ultra-compact PCB layouts in wearables and IoT edge nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV4021R1YKAR, TLV4021R1DBVR trades miniaturization for assembly flexibility, while TLV4041R1YKAR replaces open-drain functionality with push-pull drive - making each suitable for distinct signal integrity and interface architecture requirements.

Availability

TLV4021R1YKAR is available at Aetrix Electronics and suitable for lithium-ion battery protection, point-of-load voltage monitoring, and portable medical sensor interface applications requiring stable component supply and long-term production continuity.

Supply support for TLV4021R1YKAR 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLV40x1 product line was designed specifically for ultra-low-power, high-accuracy voltage monitoring in space-constrained applications - emphasizing factory-trimmed references, deterministic startup, and minimal external component count.

FAQ

What is the reference voltage accuracy of TLV4021R1YKAR over temperature?

The TLV4021R1YKAR features a factory-trimmed 1.2 V internal reference with ±0.5% accuracy at 25°C and ±1% accuracy across the full –40°C to +125°C operating range. This specification is guaranteed per datasheet Table 6-5 and enables reliable voltage threshold detection without external calibration in automotive and industrial environments.

Does TLV4021R1YKAR require external components to set its switching threshold?

No. TLV4021R1YKAR integrates a precision 1.2 V reference and requires no external resistors to establish its switching threshold. The device compares the IN pin directly against this internal reference, eliminating component count, layout area, and tolerance drift associated with external resistor dividers - a key advantage over general-purpose comparators.

What is the function of the NC pin in TLV4021R1YKAR's DSBGA package?

TLV4021R1YKAR does not have an NC (no-connect) pin. Its YKA DSBGA package contains only four functional bumps: OUT, V+, V−, and IN. The NC designation applies only to the SOT-23 variant (e.g., TLV4021R1DBVR), where pin 3 is unconnected. This distinction is critical for PCB layout and signal integrity planning.

How does the Power-on Reset (POR) circuit affect TLV4021R1YKAR's output behavior during startup?

The POR circuit in TLV4021R1YKAR forces the open-drain output into high-impedance state until V+ reaches 1.45 V. This prevents undefined or glitchy output transitions during power ramp-up. Once V+ ≥ 1.45 V, the comparator resumes normal operation - ensuring deterministic startup critical for safety-critical monitoring functions.

Can TLV4021R1YKAR operate from a 1.8 V supply while maintaining full specification compliance?

Yes. TLV4021R1YKAR is fully specified from 1.6 V to 5.5 V supply voltage. At 1.8 V, it maintains 360 ns propagation delay, 2 µA quiescent current, 20 mV hysteresis, and ±1% reference accuracy over temperature - making it ideal for single-cell Li-ion (2.7–4.2 V) and low-voltage IoT applications where supply headroom is limited.