Texas Instruments TLV809EF30DBZR

Overview

TLV809EF30DBZR from Texas Instruments is a push-pull, active-low voltage supervisor IC designed for reliable power-on reset and brownout detection in low-power systems. It features a fixed 3.0 V threshold (±0.5% typical accuracy), 400 ms reset delay, 250 nA typical supply current, and operation from 0.7 V to 6 V supply - enabling use in battery-powered microcontroller monitoring on 3.3 V rails.

For engineers reviewing the TLV809EF30DBZR datasheet, TLV809EF30DBZR pinout, TLV809EF30DBZR application, or TLV809EF30DBZR equivalent, key selection criteria include its guaranteed reset assertion down to 0.7 V VPOR, SOT-23-3 (DBZ) package with pin 1 = RESET, glitch immunity (10 µs), and compatibility with industrial temperature range (–40°C to +125°C) designs.

Technical Context

The TLV809EF30DBZR implements a precision bandgap-referenced comparator with built-in hysteresis (1.2% typical VHYS) to prevent chatter during slow-rising or noisy VDD transitions. Its internal timer enforces a fixed 400 ms reset timeout after VDD exceeds the rising threshold (VIT+ = VIT– + VHYS), ensuring stable MCU initialization.

Unlike open-drain variants, this device uses push-pull output topology - eliminating need for external pull-up resistors while supporting 2 mA sink capability at 3.3 V and 500 µA sink at 1.7 V. Glitch immunity is achieved via integrated filtering that rejects transients <10 µs duration, even at 5% overdrive.

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 - compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+ and APX809-30SA-7, TLV809EF30DBZR delivers 5× lower quiescent current, 100% longer reset delay headroom, and full industrial temperature support - making it optimal for long-life, high-reliability embedded systems.

Availability

TLV809EF30DBZR is available at Aetrix Electronics and suitable for electricity meters, factory automation controllers, and portable medical devices requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TLV809EF30DBZR 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 family targets low-power, space-constrained applications needing high-accuracy voltage supervision - especially battery-operated and safety-critical systems where deterministic reset behavior is mandatory.

FAQ

What is the exact reset threshold voltage of TLV809EF30DBZR?

The TLV809EF30DBZR has a factory-programmed falling threshold voltage (VIT–) of 3.0 V with ±0.5% typical accuracy across –40°C to +125°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table (Section 7.5) of the official datasheet. The rising threshold (VIT+) equals VIT– plus hysteresis (VHYS ≈ 1.2% of VIT–), ensuring clean release without chatter.

Does TLV809EF30DBZR require an external pull-up resistor on the RESET pin?

No, TLV809EF30DBZR does not require an external pull-up resistor because it uses a push-pull, active-low output topology. The internal driver actively pulls RESET low during undervoltage and drives it high (to VDD) when the supply is valid. This eliminates BOM cost and layout complexity versus open-drain alternatives like TLV803E.

What is the minimum supply voltage at which TLV809EF30DBZR guarantees correct reset assertion?

TLV809EF30DBZR guarantees defined reset output behavior down to 0.7 V (VPOR), meaning it will assert RESET low reliably even as VDD drops below the 3.0 V threshold - critical for orderly shutdown in battery-depleted or brownout conditions. Below 0.7 V, the output state is undefined per datasheet Section 7.5.

How does the 400 ms reset delay of TLV809EF30DBZR impact system design?

The 400 ms reset delay (variant F) ensures the monitored 3.3 V rail remains stable for sufficient time before releasing the MCU from reset - accommodating slow-start LDOs, crystal oscillator stabilization, and firmware initialization sequences. This eliminates need for external RC timing networks and improves timing predictability versus adjustable-delay supervisors.

Is TLV809EF30DBZR pin-compatible with legacy MAX809 or TLV809 devices?

Yes, TLV809EF30DBZR is pin-to-pin compatible with MAX809, APX809, and earlier TLV809 variants in the SOT-23-3 (DBZ) package, sharing identical pin 1 = RESET, pin 2 = GND, pin 3 = VDD configuration. However, it improves upon them with lower IQ, tighter threshold accuracy, wider temperature range, and enhanced glitch immunity - enabling drop-in replacement in most existing designs.