Texas Instruments TPS3707-33D

Overview

TPS3707-33D from Texas Instruments is a precision 3.3 V supply-voltage supervisor IC with active-low and active-high reset outputs, power-fail comparator (PFI/PFO), manual reset input (MR), and fixed 200 ms power-on reset delay. It operates from 2 V to 6 V, draws ≤50 µA supply current, and is rated for –40°C to 85°C. It is used in microcontroller-based systems requiring reliable power sequencing and brownout detection.

For engineers reviewing the TPS3707-33D datasheet, TPS3707-33D pinout, TPS3707-33D application, or TPS3707-33D equivalent, key selection considerations include its dual-reset output configuration, 2.93 V negative-going threshold (V_IT–), absence of watchdog timer, SOIC-8 or MSOP-PowerPAD packaging, and compatibility with industrial and embedded processor power management.

Technical Context

The TPS3707-33D implements a precision bandgap reference and comparator architecture to monitor V_DD against a factory-trimmed 2.93 V threshold (±70 mV hysteresis) and provides independent power-fail detection via the PFI input (1.25 V threshold). It asserts RESET (active-low) and RESET (active-high) simultaneously during undervoltage events, with propagation delays under 5 µs.

Unlike the TPS3705-xx series, the TPS3707-33D omits the watchdog timer and WDI/WDO pins, instead dedicating pins 7 and 8 in SOIC-8 to complementary RESET outputs. Its MR input accepts TTL/CMOS-compatible logic levels and triggers immediate reset assertion when pulled low.

Key Specifications

Pinout & Package

TPS3707-33D is available in 8-pin SOIC (D) package (3.90 mm × 4.90 mm) and 8-pin MSOP-PowerPAD (DGN) package (3.00 mm × 3.00 mm). Both packages support thermal dissipation up to 725 mW (SOIC) or 2.14 W (MSOP-PowerPAD) at T_A < 25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3707-33D, TPS3808G33DBVR offers superior ultra-low-power operation but sacrifices power-fail monitoring and dual-output flexibility, while MAX6326LT33D3+T provides legacy pin compatibility at the cost of functional reduction - making TPS3707-33D optimal for new designs requiring integrated fault signaling and robust reset coordination.

Availability

TPS3707-33D is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded microcontroller systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3707-33D 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 specializing in analog, embedded processing, and power management technologies with decades of leadership in precision analog ICs.

The TPS370x family was designed specifically for reliable power-supply monitoring in DSP, microcontroller, and microprocessor systems - delivering accurate voltage thresholds, deterministic reset timing, and integrated fault detection without external components.

FAQ

What is the exact reset threshold voltage for TPS3707-33D?

The TPS3707-33D has a factory-trimmed negative-going input threshold voltage (V_IT–) of 2.93 V, with a tolerance of ±0.07 V (±2.4%) over the full operating temperature range of –40°C to 85°C. This value is specified in the Electrical Characteristics table of the SLVS184F datasheet and applies directly to the V_DD monitoring function of the TPS3707-33D.

Does TPS3707-33D include a watchdog timer?

No, the TPS3707-33D does not include a watchdog timer. Unlike the TPS3705-xx series, the TPS3707-33D omits WDI and WDO pins and associated circuitry. Instead, it provides complementary active-low and active-high RESET outputs on pins 7 and 8 (SOIC-8), making the TPS3707-33D suitable for applications requiring dual reset signaling without watchdog functionality.

What are the package options for TPS3707-33D?

The TPS3707-33D is offered in two standard packages: 8-pin SOIC (D) with body size 3.90 mm × 4.90 mm, and 8-pin MSOP-PowerPAD (DGN) with body size 3.00 mm × 3.00 mm. Both packages are RoHS-compliant and support reflow soldering per JEDEC J-STD-020. The DGN variant includes an exposed thermal pad for enhanced power dissipation.

How does the PFI input function on TPS3707-33D?

The PFI (Power-Fail Input) on the TPS3707-33D is a dedicated analog comparator input with a fixed 1.25 V threshold. When the voltage at PFI drops below this level, the open-drain PFO output is pulled low. This allows the TPS3707-33D to monitor secondary supplies - such as battery voltage or auxiliary rails - using an external resistor divider, enabling early warning of power loss or low-battery conditions.

Can TPS3707-33D replace MAX706R in an existing design?

Yes, the TPS3707-33D is explicitly pin-for-pin compatible with the MAX706R and other MAX705–MAX708 series supervisors. It matches the 3.3 V threshold, 200 ms reset timeout, and SOIC-8 footprint. However, note that TPS3707-33D provides both active-low and active-high RESET outputs (unlike MAX706R's single active-low output), offering enhanced interface flexibility without requiring layout changes.