Texas Instruments TPS3809J25DBVTG4

Overview

TPS3809J25DBVTG4 from Texas Instruments is a 3-pin SOT-23 precision supply voltage supervisor IC designed for power-on reset and undervoltage monitoring in processor-based systems. It features a fixed 2.25 V threshold voltage, 9 μA typical supply current, 200 ms reset delay time, push-pull active-low RESET output, and operates across –40°C to +85°C for use in industrial embedded control and metering applications.

For engineers reviewing the TPS3809J25DBVTG4 datasheet, TPS3809J25DBVTG4 pinout, TPS3809J25DBVTG4 application, or TPS3809J25DBVTG4 equivalent, key selection criteria include threshold accuracy (±2.2% over temperature), low quiescent current for battery-backed systems, SOT-23 footprint compatibility with MAX809, and absence of external timing components.

Technical Context

The TPS3809J25DBVTG4 integrates an internal 1.137 V reference, comparator, timer, and push-pull output stage to generate a precise, glitch-free reset signal. Its threshold is set by an internal resistor divider calibrated to 2.25 V ±2.2% over –40°C to +85°C, with 30 mV hysteresis to prevent chatter during slow-rising or noisy supply transitions.

During power-up, RESET asserts when VDD exceeds 1.1 V and remains active until VDD rises above 2.25 V, after which a 200 ms (typ) delay ensures stable system initialization. On supply droop, RESET reasserts immediately when VDD falls below 2.25 V - no external capacitor or resistor required.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, 3-pin surface-mount configuration with GND on Pin 1, RESET (active-low push-pull) on Pin 2, and VDD on Pin 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E and MAX809TRD3, the TPS3809J25DBVTG4 offers optimal balance of proven industrial reliability, push-pull output convenience, and tight 2.25 V threshold for 2.5 V system rails - making it ideal for cost-sensitive, high-volume metering and control applications.

Availability

TPS3809J25DBVTG4 is available at Aetrix Electronics and suitable for factory automation, electricity meters, and building automation systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3809J25DBVTG4 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 over 50 years of innovation in industrial and automotive electronics.

The TPS3809 family was developed specifically for precision power-supply monitoring in DSP and microcontroller systems, emphasizing low quiescent current, fixed-threshold accuracy, and minimal external component count.

FAQ

What is the exact threshold voltage of the TPS3809J25DBVTG4?

The TPS3809J25DBVTG4 has a nominal threshold voltage of 2.25 V, specified as 2.20 V (min) to 2.30 V (max) over –40°C to +85°C. This value is factory-trimmed and does not require external adjustment. The device uses an internal resistor divider referenced to a 1.137 V bandgap, ensuring stability across temperature and supply variations. All TPS3809J25DBVTG4 units meet this specification without user calibration.

Does the TPS3809J25DBVTG4 require an external pull-up resistor on the RESET pin?

No, the TPS3809J25DBVTG4 features a push-pull RESET output stage, eliminating the need for an external pull-up resistor. It actively drives high (VOH ≥ VDD – 0.2 V at 500 μA) and low (VOL ≤ 0.3 V at 500 μA), enabling direct connection to standard CMOS reset inputs. This simplifies layout, reduces component count, and improves noise immunity compared to open-drain alternatives like the MAX809.

What is the reset delay time of the TPS3809J25DBVTG4 and how is it implemented?

The TPS3809J25DBVTG4 provides a fixed 200 ms (typical) reset delay time (t_d) after VDD rises above the 2.25 V threshold. This delay is generated by an internal oscillator-based timer and is independent of external components. The delay ensures sufficient time for processors, FPGAs, and memory to complete power-up sequencing before releasing reset. Minimum and maximum values are 120 ms and 280 ms respectively across temperature and voltage.

Is the TPS3809J25DBVTG4 pin-compatible with the MAX809 series?

Yes, the TPS3809J25DBVTG4 is explicitly designed as a pin-for-pin compatible replacement for the MAX809 series in SOT-23 packages. Pin 1 is GND, Pin 2 is RESET (active-low), and Pin 3 is VDD - matching MAX809 pinout exactly. However, note that the TPS3809J25DBVTG4 has a 2.25 V threshold versus MAX809's 2.31 V, and uses push-pull rather than open-drain output, so pull-up removal is required for full functional equivalence.

What is the recommended bypass capacitor for the TPS3809J25DBVTG4 VDD pin?

A 0.1 μF ceramic capacitor is recommended between the VDD pin and GND, placed as close as possible to the device. This capacitor stabilizes the internal reference and comparator against supply noise and transient droop, ensuring consistent threshold behavior. X7R or C0G dielectrics are preferred for temperature stability. Larger values (e.g., 1 μF) may be added in parallel for systems with high ripple, but the 0.1 μF is mandatory per TI's design guidelines for the TPS3809J25DBVTG4.