Texas Instruments TPS3806I33DBVT

Overview

TPS3806I33DBVT from Texas Instruments is a dual-voltage supervisor IC with fixed 3.0 V VDD threshold and adjustable LSENSE input (1.207 V nominal), independent open-drain RESET/RSTSENSE outputs, 3 µA typical supply current at 3.3 V, and operation from –40°C to +85°C in a 6-pin SOT-23 package - used for battery voltage monitoring and power-on reset assertion in portable Li-ion systems.

For engineers reviewing the TPS3806I33DBVT datasheet, TPS3806I33DBVT pinout, TPS3806I33DBVT application, or TPS3806I33DBVT equivalent, key selection considerations include its dual-threshold architecture (fixed VDD + adjustable LSENSE), hysteresis programmability via HSENSE, guaranteed reset assertion down to 0.8 V VDD, low quiescent current, and SOT-23 footprint compatibility with space-constrained battery-powered designs.

Technical Context

The TPS3806I33DBVT integrates two independent comparators: one monitors VDD against a fixed internal 3.0 V threshold (±22 mV over temperature), while the second monitors LSENSE against a precision 1.207 V reference. HSENSE enables external resistor programming of upper trip point to set hysteresis window (60–90 mV depending on VIT range).

Both RESET and RSTSENSE are active-low open-drain outputs requiring external pull-ups; propagation delays are 5–100 µs; supply current remains stable (3–5 µA) across 1.3–6 V VDD and full temperature range; input bias current at LSENSE/HSENSE is ±25 nA, enabling high-impedance sensing networks.

Key Specifications

Pinout & Package

TPS3806I33DBVT uses a 6-pin SOT-23 (DBV) package with gull-wing leads, 0.95 mm pitch, and 1.45 mm max height. Pin 1 is marked by an index area; device orientation follows JEDEC MO-178 standard with pin 1 in quadrant Q3 on tape.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3806J20DBVT, the TPS3806I33DBVT provides higher VDD threshold alignment for 3.3 V systems, while TLV809E33DBVR offers lower quiescent current but sacrifices the critical dual-threshold architecture needed for integrated battery+system supervision.

Availability

TPS3806I33DBVT is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, wearables, and industrial handheld equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOT-23 packaging.

Supply support for TPS3806I33DBVT 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, embedded processing, and connectivity solutions with emphasis on reliability, energy efficiency, and design enablement.

The TPS3806 family is designed specifically for dual-rail voltage supervision in battery-critical applications, combining fixed and adjustable thresholds to simplify power integrity validation in portable and remote electronics.

FAQ

What is the exact VDD threshold voltage specification for TPS3806I33DBVT?

The TPS3806I33DBVT has a fixed VDD threshold of 3.0 V with a tolerance of ±22 mV over the full –40°C to +85°C temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "VIT" for the TPS3806I33 variant. The threshold remains stable across supply voltages from 1.3 V to 6 V, and the device guarantees reset assertion down to VDD = 0.8 V during power-up. This makes the TPS3806I33DBVT suitable for robust 3.3 V system supervision.

How does the LSENSE input function in TPS3806I33DBVT, and what is its reference voltage?

The LSENSE input in the TPS3806I33DBVT monitors an external voltage divider connected to a battery or auxiliary rail, comparing it against an internal precision 1.207 V reference. Its nominal threshold is 1.207 V ±19 mV over temperature, with input bias current limited to ±25 nA - enabling high-impedance sensing networks that minimize battery drain. When the voltage at LSENSE falls below this threshold, the RSTSENSE output pulls low. This functionality allows the TPS3806I33DBVT to serve as a dedicated battery voltage supervisor alongside its fixed VDD monitoring.

Can TPS3806I33DBVT support programmable hysteresis, and how is it implemented?

Yes, the TPS3806I33DBVT supports programmable hysteresis via the HSENSE pin. An external resistor divider connected to HSENSE sets an upper trip point above the LSENSE threshold, defining a hysteresis window of 60 mV (for VIT < 2.5 V) or 90 mV (for VIT between 2.5 V and 3.5 V). This eliminates oscillation near threshold during slow voltage ramps - a critical feature for battery voltage monitoring in the TPS3806I33DBVT. No additional ICs or capacitors are required; hysteresis is purely resistor-programmable.

What are the absolute maximum ratings for TPS3806I33DBVT, and why is the 7 V limit on VDD important?

The absolute maximum rating for VDD on the TPS3806I33DBVT is 7 V, with a derating requirement: continuous operation above 70°C must not exceed 280 mW, and operation at 7 V is limited to ≤1000 hours total. Exceeding 7 V risks permanent damage due to junction breakdown. This limit is critical because the TPS3806I33DBVT is intended for low-voltage battery systems (1.3–6 V recommended operating range); applying unregulated adapter or surge voltages beyond 7 V violates absolute maximum conditions and voids reliability guarantees.

Is TPS3806I33DBVT pin-compatible with other members of the TPS3806 family, and what changes are needed for substitution?

Yes, all TPS3806 variants including TPS3806I33DBVT, TPS3806J20DBVT, and TPS3806I33DBVR share identical 6-pin SOT-23 (DBV) packaging and pinout - making them mechanically and electrically pin-compatible. Substitution requires only verification of threshold alignment: TPS3806J20DBVT uses 1.8 V VDD threshold instead of 3.0 V, so board-level firmware or system timing assumptions may need review. No PCB layout or schematic changes are needed for direct replacement within the same DBV package variant.