Texas Instruments TLV809EA43DBZR

Overview

TLV809EA43DBZR from Texas Instruments is a push-pull, active-low voltage supervisor IC designed for reliable power-on reset and brownout detection in low-power embedded systems. It features a fixed 4.38 V under-voltage threshold (±0.5% typical accuracy), 200 ms reset delay, 250 nA typical supply current, and operation down to 0.7 V VDD - enabling robust supervision in battery-powered and industrial edge nodes.

For engineers reviewing the TLV809EA43DBZR datasheet, TLV809EA43DBZR pinout, TLV809EA43DBZR application, or TLV809EA43DBZR equivalent, key selection criteria include its SOT-23-3 (DBZ) package with pin 1 = GND, guaranteed RESET assertion below 4.38 V, glitch immunity against ≤10 µs transients, and compatibility with 1.7–6 V supply rails in space-constrained designs.

Technical Context

The TLV809EA43DBZR integrates a precision bandgap reference, comparator with 1.2% typical hysteresis (VHYS), and a fixed 200 ms monostable timer to generate a clean, debounced reset pulse. Its push-pull output drives low without external pull-up, supporting direct interface to microcontrollers and FPGAs requiring active-low reset assertion.

It operates across –40°C to +125°C with VPOR = 700 mV, ensuring defined reset state during ultra-low-voltage power-up. The device ignores fast VDD transients via built-in 10 µs glitch immunity logic, eliminating false resets in noisy power environments.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, with pin 1 = GND (confirmed per Figure 6-1 and Table 6-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3809K33DBVR and MAX809SEUR+T, the TLV809EA43DBZR delivers tighter threshold accuracy, lower power, and push-pull simplicity - making it optimal for 4.5 V rail supervision where long battery life and layout efficiency are critical.

Availability

TLV809EA43DBZR is available at Aetrix Electronics and suitable for electricity meters, factory automation controllers, and portable medical sensors requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for TLV809EA43DBZR 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 TLV809E series belongs to TI's low-power voltage supervisor product line, engineered specifically for high-accuracy, ultra-low-IQ power monitoring in battery-critical and thermally demanding applications.

FAQ

What is the exact reset threshold voltage of TLV809EA43DBZR?

The TLV809EA43DBZR has a factory-programmed falling threshold voltage (VIT–) of 4.38 V with ±0.5% typical accuracy over –40°C to +125°C. This value is fixed and non-adjustable, optimized for supervision of nominal 4.5 V power rails. The rising threshold (VIT+) equals VIT– plus hysteresis (1.2% typical), ensuring noise immunity during recovery.

Does TLV809EA43DBZR require an external pull-up resistor on the RESET pin?

No, TLV809EA43DBZR does not require an external pull-up resistor because it uses a push-pull, active-low output topology. The RESET pin actively drives low during fault conditions and high during normal operation, simplifying PCB layout and reducing BOM count compared to open-drain alternatives like TLV803E.

What is the minimum supply voltage at which TLV809EA43DBZR guarantees a valid reset output?

TLV809EA43DBZR guarantees a defined reset output state down to VPOR = 700 mV. Below this voltage, the output becomes undefined. This ultra-low VPOR enables reliable reset assertion during deep brownout events and cold-start scenarios where input rails ramp slowly from near-zero.

How does the 200 ms reset delay in TLV809EA43DBZR improve system reliability?

The 200 ms fixed reset delay in TLV809EA43DBZR ensures downstream logic (e.g., MCUs, FPGAs) remains held in reset long enough for all power rails and clocks to stabilize fully. This prevents premature execution, configuration errors, and metastability issues common in complex digital systems with multiple supply domains.

Is TLV809EA43DBZR pin-compatible with legacy MAX809 devices?

Yes, TLV809EA43DBZR is pin-to-pin compatible with MAX809/803/810 family devices in SOT-23-3 packages, per TI's documentation. However, differences in threshold voltage (4.38 V vs. MAX809's 4.63 V), delay (200 ms vs. 140 ms), and output drive (push-pull vs. open-drain in MAX803) require verification in the target application before substitution.