Texas Instruments TPS3801-01DCKR

Overview

TPS3801-01DCKR from Texas Instruments is an ultra-small, 5-pin SC-70 (SOT-323) supply voltage supervisor IC with adjustable threshold (V_REF = 1.14 V), 200 ms factory-programmed power-on reset delay, and push-pull RESET output. It monitors VDD or external SENSE voltage to provide reliable power-up initialization for low-voltage DSPs and microcontrollers in portable equipment.

For engineers reviewing the TPS3801-01DCKR datasheet, TPS3801-01DCKR pinout, TPS3801-01DCKR application, or TPS3801-01DCKR equivalent, key selection criteria include its adjustable 1.14 V reference, 9–12 µA supply current at 1.6–4 V, absence of manual reset (MR) input, –40°C to +85°C operation, and SC-70 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3801-01DCKR implements a precision bandgap reference (1.14 V ±2.5%) feeding a comparator that triggers a monostable timer upon VDD or SENSE falling below threshold. Its internal oscillator drives a fixed 200 ms delay circuit before deasserting RESET after recovery.

No manual reset (MR) input is present-unlike other TPS380x variants-making it suitable for systems where external reset assertion is unnecessary. The device uses a push-pull output stage capable of sinking 5 mA or sourcing –5 mA, eliminating need for external pull-up resistors in most applications.

Key Specifications

Pinout & Package

TPS3801-01DCKR is housed in a 5-pin SC-70 (SOT-323) package measuring 2.41 mm × 1.25 mm × 0.9 mm (max height), optimized for ultra-dense PCB layouts. Pin 1 is marked by an index area on the top surface; tape-and-reel orientation follows quadrant Q3 per TI's packaging specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3801E18DCKR, the TPS3801-01DCKR offers design flexibility via adjustable threshold but requires two external resistors; compared with MAX6326UT29D3+T, it delivers lower quiescent current, smaller footprint, and push-pull output-reducing component count and improving timing predictability.

Availability

TPS3801-01DCKR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and automotive body control units requiring stable component supply with consistent lead times and full traceability.

Supply support for TPS3801-01DCKR 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, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and consumer markets.

The TPS380x family was developed specifically for ultra-low-power, space-constrained voltage supervision in portable and battery-operated systems-emphasizing minimal footprint, nanoscale quiescent current, and factory-trimmed timing accuracy.

FAQ

What is the function of the SENSE pin on the TPS3801-01DCKR?

The SENSE pin on the TPS3801-01DCKR serves as the adjustable threshold input, allowing external resistor divider networks to set the voltage at which RESET activates. With a nominal internal reference of 1.14 V and ±2.5% accuracy, it enables precise monitoring of any supply rail ≥1.14 V. The pin draws only ±25 nA, minimizing divider current error and enabling high-impedance designs critical for low-power systems.

Does the TPS3801-01DCKR have a manual reset (MR) input?

No, the TPS3801-01DCKR does not include a manual reset (MR) input. This distinguishes it from other members of the TPS380x family such as TPS3801J25DCKR or TPS3801L30DCKR. Its functional block diagram confirms omission of MR circuitry, making the TPS3801-01DCKR appropriate for applications where only power-on and brownout reset supervision is required-simplifying layout and reducing external component count.

What is the recommended bypass capacitor for the TPS3801-01DCKR?

A 0.1 µF ceramic capacitor is recommended between VDD and GND, placed as close as possible to the TPS3801-01DCKR pins. This decoupling capacitor stabilizes the internal reference and comparator operation, especially during transient load conditions. The datasheet explicitly states that "to ensure the best stability of the threshold voltage, a bypass capacitor (0.1-µF ceramic) should be placed near the supply terminals," and TI's typical application circuits consistently show this value.

Can the TPS3801-01DCKR monitor a 3.3 V supply rail?

Yes, the TPS3801-01DCKR can monitor a 3.3 V supply rail using the SENSE pin with an external resistor divider. For example, a 2.21 MΩ top resistor and 787 kΩ bottom resistor yields a division ratio of 0.262, resulting in ~0.865 V at SENSE-below the 1.14 V reference. Adjusting the divider to produce exactly 1.14 V at SENSE corresponds to a 3.3 V rail threshold of ~2.93 V (89% of rail), meeting common undervoltage lockout requirements while leveraging the device's adjustable architecture.

What is the maximum supply voltage rating for the TPS3801-01DCKR?

Per the Absolute Maximum Ratings table, the TPS3801-01DCKR has a maximum supply voltage (VDD) rating of 7 V. However, the Recommended Operating Conditions specify a maximum of 4 V for all devices in the TPS3801-xx series-including the TPS3801-01DCKR. Operation above 4 V is outside specification and may cause unreliable reset behavior or accelerated parametric drift; sustained operation at 7 V is limited to <1000 hours per TI's reliability guidance.