Texas Instruments TLV809EA45DBZR

Overview

TLV809EA45DBZR from Texas Instruments is a push-pull, active-low voltage supervisor IC designed for supply rail monitoring in low-power embedded systems. It features a fixed 4.55 V under-voltage detection threshold (±0.5% typical accuracy), 200 ms reset delay, 250 nA typical supply current, and operates across –40°C to +125°C. It ensures reliable power-on reset down to 0.7 V VDD and is used in battery-powered metering and industrial control circuits.

For engineers reviewing the TLV809EA45DBZR datasheet, TLV809EA45DBZR pinout, TLV809EA45DBZR application, or TLV809EA45DBZR equivalent, key selection criteria include its SOT-23-3 (DBZ) package with pin 1 = RESET, guaranteed reset assertion below 4.55 V, glitch immunity against <10 µs transients, and compatibility with systems requiring stable low-I_Q supervision without external pull-up resistors.

Technical Context

The TLV809EA45DBZR implements a precision bandgap-referenced comparator with integrated hysteresis (V_HYS ≈ 1.2% of V_IT–) to prevent chatter during threshold crossings. Its internal timer enforces a fixed 200 ms reset timeout after VDD rises above V_IT+, ensuring sufficient system stabilization before release.

It uses a push-pull output stage capable of sinking 2 mA at 1.7 V and sourcing 4 mA at 6 V, eliminating need for external pull-up components. Glitch immunity is achieved via a dedicated filter rejecting transients shorter than 10 µs (typical) with ≥5% overdrive on VDD.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, with pin 1 = RESET, pin 2 = GND, pin 3 = VDD - confirmed per TI SLVSES2J Figure 6-3 and Table 6-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SUR+T and APX809-45SA-7, TLV809EA45DBZR delivers tighter threshold accuracy (±0.5% vs. ±1.5%/±2.0%), 10× lower quiescent current, and full automotive-grade temperature support - making it optimal for next-generation battery-constrained and high-reliability systems.

Availability

TLV809EA45DBZR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and portable medical sensors requiring stable component supply with long-term lifecycle assurance.

Supply support for TLV809EA45DBZR 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 power management technologies, with decades of expertise in precision analog ICs.

The TLV809E series belongs to TI's low-power voltage supervisor product line, engineered specifically for energy-constrained and thermally demanding applications including utility infrastructure, factory automation, and portable instrumentation.

FAQ

What is the exact reset threshold voltage of TLV809EA45DBZR?

The TLV809EA45DBZR has a factory-programmed falling threshold voltage (V_IT–) of 4.55 V with ±0.5% typical accuracy across –40°C to +125°C. This value is fixed and unadjustable, optimized for monitoring nominal 5 V rails while allowing for standard tolerance margins. The rising threshold (V_IT+) is V_IT– plus hysteresis (~1.2% of V_IT–), ensuring noise immunity during recovery.

Does TLV809EA45DBZR require an external pull-up resistor on the RESET pin?

No, TLV809EA45DBZR does not require an external pull-up resistor because it features a push-pull active-low output stage. Unlike open-drain supervisors (e.g., TLV803E), the TLV809EA45DBZR actively drives both logic-high and logic-low states on the RESET pin, simplifying PCB layout and reducing BOM count. This eliminates leakage and timing uncertainty associated with external bias networks.

What is the minimum supply voltage at which TLV809EA45DBZR guarantees correct reset behavior?

TLV809EA45DBZR guarantees defined reset output behavior down to 0.7 V VDD - its power-on-reset (VPOR) voltage. Below 0.7 V, the output state is undefined. This capability enables robust supervision during ultra-low-power wake-up sequences and battery-depleted conditions, a key advantage over older supervisors with VPOR > 1.0 V.

How does the 200 ms reset delay in TLV809EA45DBZR improve system reliability?

The fixed 200 ms reset delay (variant A) in TLV809EA45DBZR ensures the supervised microcontroller or ASIC remains held in reset long enough for all internal power domains, clocks, and memory to stabilize after VDD crosses the rising threshold. This prevents race conditions, bus contention, or corrupted register initialization - critical for fail-safe operation in industrial and metering applications where deterministic boot is mandatory.

Is TLV809EA45DBZR pin-compatible with legacy MAX809 devices?

Yes, TLV809EA45DBZR is pin-compatible with MAX809 (4.6 V variant) and APX809 in the SOT-23-3 (DBZ) package, sharing identical pin 1 = RESET, pin 2 = GND, pin 3 = VDD configuration. However, TLV809EA45DBZR offers superior specifications: ±0.5% threshold accuracy vs. ±1.5%, 250 nA vs. 2.5 µA I_Q, and –40°C to +125°C operation vs. –40°C to +85°C - enabling drop-in performance upgrades.