Texas Instruments TPS3805H33DCKRG4

Overview

TPS3805H33DCKRG4 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 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 TPS3805H33DCKRG4 datasheet, TPS3805H33DCKRG4 pinout, TPS3805H33DCKRG4 application, or TPS3805H33DCKRG4 equivalent, key selection criteria include dual-threshold supervision capability, push/pull output drive strength, low quiescent current, temperature-stable threshold accuracy, and SC-70 footprint compatibility for space-constrained embedded designs.

Technical Context

The TPS3805H33DCKRG4 integrates two independent comparators: one monitors VDD against a precision 3.05 V internal reference, the other monitors an external SENSE node against a 1.226 V reference. RESET asserts when either input falls below its respective threshold.

It features built-in hysteresis (30 mV for VDD thresholds >2.5 V), power-up reset activation at VDD ≥0.8 V, and propagation delays under 100 µs for both VDD and SENSE inputs-enabling reliable sequencing in multi-rail systems with fast transient response.

Key Specifications

Pinout & Package

TPS3805H33DCKRG4 uses a 5-pin SC-70 (DCK) package measuring 2.15 mm × 1.40 mm × 1.10 mm max height, optimized for high-density PCB layouts and reflow-compatible with standard SMT processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3805H33DCKR, the TPS3805H33DCKRG4 offers identical functionality with updated environmental compliance, while the MAX6816EUT+T trades dual-threshold flexibility and push/pull drive for lower IQ-making it viable only in simplified single-rail applications where board space permits external pull-up and timing margins allow longer reset hold times.

Availability

TPS3805H33DCKRG4 is available at Aetrix Electronics and suitable for industrial control systems, battery-powered instrumentation, wireless infrastructure equipment, and automotive infotainment modules requiring stable component supply and long-term manufacturability.

Supply support for TPS3805H33DCKRG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.

The TPS3805 family was designed specifically for robust, low-power voltage supervision in processor-centric systems-emphasizing precision threshold accuracy, dual-input flexibility, and compact packaging for next-generation embedded platforms.

FAQ

What is the exact threshold voltage specification for VDD on the TPS3805H33DCKRG4?

The TPS3805H33DCKRG4 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. The device asserts RESET when VDD falls below this threshold and deasserts it after VDD rises above 3.05 V plus hysteresis (30 mV).

Does the TPS3805H33DCKRG4 support monitoring of a 1.2 V rail using the SENSE pin?

Yes, the TPS3805H33DCKRG4 supports monitoring of a 1.2 V rail via the SENSE pin using an external resistor divider. Its SENSE threshold is fixed at 1.226 V ±1.5%, so a resistive network scaling the 1.2 V rail to match that reference (e.g., R1 = 100 kΩ, R2 = 1.02 MΩ) enables accurate supervision. Input bias current is ≤25 nA, minimizing divider error.

Is the RESET output of the TPS3805H33DCKRG4 compatible with 5 V logic systems?

No, the TPS3805H33DCKRG4 RESET output is not 5 V tolerant. It operates as a push/pull driver referenced to VDD (max 6 V), so its high-level output is typically 0.8×VDD and low-level is ≤0.3 V. When VDD = 3.3 V, VOH ≈ 2.64 V - insufficient for reliable 5 V CMOS input recognition. For 5 V systems, use a level-shifter or select a supervisor with 5 V–tolerant output.

Can the TPS3805H33DCKRG4 replace the TPS3803G15DCKR in an existing design?

No, the TPS3805H33DCKRG4 cannot directly replace the TPS3803G15DCKR. While both share the same SC-70 package and pinout, the TPS3803G15 is a single-threshold (1.4 V) supervisor with open-drain RESET, whereas the TPS3805H33DCKRG4 is dual-threshold (3.05 V + 1.226 V) with push/pull RESET. Swapping them would require schematic and firmware changes to accommodate the second sense input and active-high drive behavior.

What is the minimum recommended bypass capacitor for the VDD pin of the TPS3805H33DCKRG4?

The minimum recommended bypass capacitor for the VDD pin of the TPS3805H33DCKRG4 is a 0.1 µF ceramic capacitor placed as close as possible to the pin. TI specifies this in the Electrical Characteristics section to ensure stable internal reference operation and suppress high-frequency noise that could cause false reset assertions. X7R or C0G dielectrics are preferred for temperature stability.