Texas Instruments TPS3805H33DCKR

Overview

TPS3805H33DCKR from Texas Instruments is a dual-voltage supervisor IC with fixed 3.05 V VDD threshold and adjustable 1.226 V SENSE input, ±1.5% threshold accuracy, 3 µA typical supply current at 3.3 V, push/pull RESET output, and operation from −40°C to +85°C in a 5-pin SC-70 package-used for power-on reset and voltage monitoring in DSP/microprocessor systems.

For engineers reviewing the TPS3805H33DCKR datasheet, TPS3805H33DCKR pinout, TPS3805H33DCKR application, or TPS3805H33DCKR equivalent, key selection criteria include dual-threshold supervision capability, push/pull output drive strength (±5 mA), low quiescent current, hysteresis (30 mV), and compatibility with 1.3–6 V supply rails.

Technical Context

The TPS3805H33DCKR integrates two independent comparators: one monitors VDD against a precision 3.05 V internal reference, the other compares an external SENSE voltage (set by resistive divider) against a 1.226 V reference. RESET asserts when either input falls below its respective threshold.

It employs a bandgap-based reference architecture with 30 mV hysteresis on the VDD path (2.5–3.5 V range), supports power-up reset assertion below 0.8 V VDD, and delivers rail-to-rail push/pull output capable of sourcing/sinking up to ±5 mA-enabling direct interface with microcontroller reset inputs without pull-up resistors.

Key Specifications

Pinout & Package

Package: 5-pin SC-70 (DCK), 2.0 × 1.25 × 0.9 mm body, 0.65 mm pitch, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3805H33DCKR, the DBVR variant offers identical supervision performance in a larger, more manufacturable package, while the MAX6326 requires external components to replicate even basic dual-rail functionality-making TPS3805H33DCKR the optimal choice for space-constrained, low-power dual-supply systems.

Availability

TPS3805H33DCKR is available at Aetrix Electronics and suitable for wireless communication systems, industrial PLC controllers, and notebook system management requiring stable component supply and long-term production continuity.

Supply support for TPS3805H33DCKR 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 experience in high-reliability supervisory circuits.

The TPS3805 family was designed specifically for dual-rail voltage monitoring in DSP, microcontroller, and processor-based systems-delivering precision, low power, and compact packaging for modern embedded platforms.

FAQ

What is the exact VDD threshold voltage of the TPS3805H33DCKR?

The TPS3805H33DCKR has a nominal VDD threshold voltage of 3.05 V, with ±1.5% accuracy over the full −40°C to +85°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS392A datasheet under "VIT Negative-going input threshold voltage" for TPS3805H33.

Does the TPS3805H33DCKR support adjustable reset timeout delay?

No, the TPS3805H33DCKR does not provide programmable reset timeout delay. It asserts RESET immediately when VDD or SENSE falls below their respective thresholds and deasserts RESET within 5–100 µs after both inputs rise above threshold-timing is purely comparator-based with no internal timer or capacitor pin.

Can the SENSE pin of the TPS3805H33DCKR monitor voltages above 3.3 V?

Yes-the SENSE pin is a high-impedance input rated for 0 V to VDD + 0.3 V. When VDD = 6 V, SENSE can safely monitor up to 6.3 V; however, the internal 1.226 V reference remains fixed, so external resistor scaling is required to map higher voltages into the detectable range.

Is the TPS3805H33DCKR pin-compatible with the TPS3803G15DCKR?

No-while both use the same SC-70-5 package and share pin 1 (NC), pin 5 is SENSE on TPS3805H33DCKR but NC on TPS3803G15DCKR. Swapping them would leave the SENSE function unconnected or cause incorrect behavior due to mismatched internal topology.

What is the maximum sink/source current capability of the RESET output on the TPS3805H33DCKR?

The RESET output of the TPS3805H33DCKR can sink up to 5 mA (VOL ≤ 0.3 V at IOL = 2 mA, VDD = 3.3 V) and source up to 5 mA (VOH ≥ 0.8 × VDD at IOH = −1.0 mA, VDD = 3.3 V), as confirmed in the Electrical Characteristics table of the SLVS392A datasheet.