Texas Instruments LM810M3-4.63/NOPB

Overview

LM810M3-4.63/NOPB from Texas Instruments is a 3-pin SOT-23 active-high microprocessor reset supervisor IC designed to monitor 5-V supply rails. It asserts a high-level RESET signal when VCC falls below 4.63 V (±3% at 25°C), holds reset for 240 ms after VCC recovers, operates down to VCC = 1 V, draws only 15 µA typical supply current, and is qualified for industrial temperature range (–40°C to +105°C). It serves in power-up/brown-out detection for embedded controllers.

For engineers reviewing the LM810M3-4.63/NOPB datasheet, LM810M3-4.63/NOPB pinout, LM810M3-4.63/NOPB application, or LM810M3-4.63/NOPB equivalent, key selection criteria include reset threshold accuracy (4.63 V ±3%), active-high output polarity, guaranteed reset assertion at VCC ≥1 V, 240-ms timeout stability over temperature, and SOT-23 footprint compatibility with space-constrained industrial control PCBs.

Technical Context

The LM810M3-4.63/NOPB implements a precision bandgap-based voltage comparator with factory-trimmed 4.63-V threshold and internal 240-ms monostable timer. Its active-high RESET output remains high during undervoltage and for 240 ms after VCC exceeds the threshold, ensuring reliable microprocessor initialization.

It features transient immunity (20 µs max glitch rejection at 100 mV below threshold), operates across full industrial temperature range, maintains valid output down to VCC = 1 V, and requires no external components beyond optional 0.1-µF bypass capacitor on VCC.

Key Specifications

Pinout & Package

LM810M3-4.63/NOPB uses the industry-standard 3-pin SOT-23 (DBZ) package, measuring 2.92 mm × 1.30 mm, with gull-wing leads optimized for automated assembly and thermal performance (RθJA = 252°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX810LUR46-T, LM810M3-4.63/NOPB delivers wider temperature qualification and lower quiescent current; versus TPS3808G33DBVR, it offers drop-in 4.63-V accuracy without external components-critical for cost-sensitive, high-volume industrial designs.

Availability

LM810M3-4.63/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, renewable inverters, and automotive body control modules requiring stable component supply across long production lifecycles.

Supply support for LM810M3-4.63/NOPB 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 and embedded processing technologies, with decades of expertise in power management, signal chain, and microcontroller solutions.

The LM810 series belongs to TI's microprocessor supervisory IC product line, engineered specifically for robust, low-component-count power monitoring in industrial, automotive, and energy infrastructure applications.

FAQ

What is the exact reset threshold voltage of the LM810M3-4.63/NOPB and how does it vary with temperature?

The LM810M3-4.63/NOPB has a nominal reset threshold of 4.63 V with ±3% tolerance at 25°C. Over the full industrial temperature range (–40°C to +105°C), the threshold shifts by a maximum of ±0.16 V (±30 ppm/°C drift), remaining within 4.40 V to 4.86 V. This precision ensures consistent 5-V rail monitoring without recalibration across operating conditions, and the LM810M3-4.63/NOPB datasheet specifies these limits in Section 6.5.

Does the LM810M3-4.63/NOPB require external components to function correctly?

No, the LM810M3-4.63/NOPB operates autonomously with only VCC, GND, and RESET connections. However, Texas Instruments recommends a 0.1-µF ceramic bypass capacitor placed as close as possible to the VCC pin to suppress high-frequency transients and prevent false resets. No pull-up or pull-down resistors are needed due to its active-high output architecture, and the LM810M3-4.63/NOPB is fully specified for direct interface with standard CMOS inputs.

How does the LM810M3-4.63/NOPB behave when VCC drops below 1 V?

The LM810M3-4.63/NOPB guarantees valid RESET output only for VCC ≥1 V. Below this level, the internal circuitry may cease functioning, and RESET becomes undefined-not necessarily held high. For applications requiring asserted RESET down to 0 V, TI recommends adding a 100-kΩ pull-up resistor from RESET to VCC. This ensures predictable behavior during deep brown-out, and the LM810M3-4.63/NOPB functional description in Section 7.3.1.1 addresses this design consideration explicitly.

Is the LM810M3-4.63/NOPB pin-compatible with other members of the LM809/LM810 family?

Yes, all LM809 and LM810 variants-including LM810M3-4.63/NOPB-share identical 3-pin SOT-23 (DBZ) packaging and pinout (GND, RESET, VCC). This allows direct substitution between threshold voltages (e.g., 2.63 V, 3.08 V, 4.63 V) and output polarities (LM809 = active-low, LM810 = active-high) without PCB changes. The LM810M3-4.63/NOPB mechanical drawings confirm identical footprint and solder pad dimensions per TI's DBZ package specification.

What is the minimum VCC required for the LM810M3-4.63/NOPB to assert a valid RESET signal?

The LM810M3-4.63/NOPB ensures a valid high-level RESET output for VCC ≥1 V, as specified in Section 6.3 (Recommended Operating Conditions) and Section 6.5 (Electrical Characteristics). Below 1 V, output behavior is not guaranteed. This 1-V minimum enables reliable reset assertion during gradual brown-out scenarios common in industrial power supplies, and the LM810M3-4.63/NOPB datasheet confirms this limit applies across the full –40°C to +105°C temperature range.