Diodes Incorporated PT7M6837ID3TBEX

Overview

PT7M6837ID3TBEX from Pericom Semiconductor is an ultra-low-voltage supervisor IC with open-drain active-low reset output, factory-set 1.388 V reset threshold (±1.5% accuracy), 210 ms timeout period, and operation down to 0.9 V supply. It monitors +1.2 V to +1.8 V logic supplies in microprocessor systems, asserting reset during brownout or power-up sequencing. Used in portable battery-powered equipment requiring low quiescent current (7.5 µA typical) and reliable power-on reset.

For engineers reviewing the PT7M6837ID3TBEX datasheet, PT7M6837ID3TBEX pinout, PT7M6837ID3TBEX application, or PT7M6837ID3TBEX equivalent, key selection criteria include reset threshold tolerance, timeout period stability over temperature, MR input debounce capability, and compatibility with bidirectional µP reset pins via open-drain configuration.

Technical Context

The PT7M6837ID3TBEX implements a precision bandgap-based voltage comparator with 444 mV internal reference and ±70 ppm/°C temperature coefficient, enabling stable threshold detection across –40°C to +85°C. Its reset assertion logic combines VCC monitoring and debounced manual reset (MR) input, with fixed 210 ms timeout after recovery.

It features immunity to short negative VCC transients and supports valid reset output down to VCC = 0.9 V. The open-drain RESET output requires an external pull-up resistor and allows level-shifting to higher-voltage domains-critical for interfacing with bidirectional µP reset I/Os or multi-rail systems.

Key Specifications

Pinout & Package

SOT143-4L (TB) package: 4-pin surface-mount, 1.3 mm × 2.1 mm footprint, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR29D3+T and TPS3808G125DBVR, PT7M6837ID3TBEX delivers exact 1.388 V detection for 1.2 V–1.8 V systems, integrated MR debounce, and open-drain flexibility-making it optimal for compact, low-voltage, multi-source reset architectures without added BOM cost.

Availability

PT7M6837ID3TBEX is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and automotive body control units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PT7M6837ID3TBEX 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

Pericom Semiconductor (now part of Diodes Incorporated) specializes in high-performance interface, timing, and power management ICs for communications, computing, and industrial markets.

The PT7M6832–PT7M6840 family was designed specifically for ultra-low-voltage microprocessor supervision in battery-powered and energy-sensitive systems, emphasizing precision threshold accuracy, minimal quiescent current, and robust transient immunity.

FAQ

What is the minimum VCC required for guaranteed reset functionality?

The PT7M6837ID3TBEX guarantees valid reset assertion down to VCC = 0.9 V for active-low operation. Below 0.9 V, the internal circuitry may not sustain comparator bias, though the open-drain RESET output remains functional if externally pulled up-enabling reset validity to 0 V with proper external biasing per Figure 4 in the datasheet.

Can the MR pin be left unconnected without external pull-up?

Yes-the MR pin has an internal 20 kΩ pull-up to VCC, so it may be left floating if manual reset is unused. This eliminates external components and simplifies PCB layout. When used, MR must be driven below 0.3×VCC to assert reset, and the internal debounce ensures clean edge detection without firmware intervention.

Does the 210 ms timeout period vary with temperature or supply voltage?

No-the 210 ms timeout (D3 suffix) is factory-trimmed and specified to remain within ±20% over –40°C to +85°C and 0.9 V to 5.5 V VCC. Measured typical variation is <±5%, ensuring deterministic reset hold time regardless of environmental or supply conditions in target applications.

Is a pull-up resistor required on the RESET pin, and what value is recommended?

Yes-an external pull-up resistor is mandatory for the open-drain RESET output. A 10 kΩ to 100 kΩ resistor to any voltage ≤6 V is recommended. Lower values improve noise immunity but increase static current; 47 kΩ is typical for 3.3 V pull-up, delivering ~70 µA leakage while maintaining fast rise time and compatibility with µP input thresholds.