Diodes Incorporated PT7M6837HD0TBEX

Overview

PT7M6837HD0TBEX from Pericom Semiconductor is an ultra-low-voltage supervisor IC with open-drain active-low reset output, factory-set 1.313V reset threshold (H suffix), and 70μs timeout (D0 suffix), designed for monitoring +1.2V to +1.8V supply rails in microprocessor systems. It operates down to 0.9V VCC, consumes 7.5μA typical supply current, and features immunity to short negative VCC transients.

For engineers reviewing the PT7M6837HD0TBEX datasheet, PT7M6837HD0TBEX pinout, PT7M6837HD0TBEX application, or PT7M6837HD0TBEX equivalent, this device serves as a precision voltage monitor for brownout detection, power-up sequencing, and manual reset coordination in space-constrained portable electronics requiring stable low-threshold reset assertion.

Technical Context

The PT7M6837HD0TBEX implements a precision bandgap reference (444mV ±2%) feeding a comparator that monitors VCC against a factory-trimmed threshold (1.313V ±1.5%). Its reset logic asserts /RESET low when VCC falls below threshold and holds it for exactly 70μs after VCC recovers - the shortest timeout option in the family.

This variant belongs to the PT7M6835/6836/6837 subgroup, featuring a debounced active-low manual reset input (MR) with internal 20kΩ pull-up and guaranteed reset validity down to 0.9V VCC. It uses SOT143-4L packaging with dedicated GND, VCC, RESET, and MR terminals - no RESET-IN functionality.

Key Specifications

Pinout & Package

SOT143-4L package: 1.3mm × 1.3mm × 0.95mm body, 0.65mm pitch, 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 TPS3123E13DBVR and MAX6373XR23D3+, PT7M6837HD0TBEX delivers the fastest available reset response (70μs), integrated MR debouncing, and precise 1.313V threshold - making it optimal for battery-sensitive, high-reliability embedded systems where minimal latency and zero external components are critical.

Availability

PT7M6837HD0TBEX is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart card readers, and low-power MCU subsystems requiring stable component supply with guaranteed long-term sourcing.

Supply support for PT7M6837HD0TBEX 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 consumer electronics.

The PT7M6832–6840 series was designed specifically for ultra-low-voltage microprocessor supervision in portable and battery-powered systems, emphasizing minimal quiescent current, factory-trimmed accuracy, and compact packaging.

FAQ

What is the minimum VCC required for valid reset assertion?

The PT7M6837HD0TBEX guarantees valid reset assertion down to 0.9V VCC. Below this voltage, the internal circuitry may not reliably detect threshold crossing or maintain output state. For applications requiring reset validity down to 0V, a 100kΩ pull-down resistor on the open-drain RESET output is recommended to prevent floating states during deep brownout.

Can the MR pin be left unconnected?

Yes - the MR pin has an internal 20kΩ pull-up resistor to VCC, so it may be left unconnected if manual reset functionality is not needed. This eliminates external components and simplifies PCB layout. If used, MR must be driven to ≤0.3×VCC to assert reset, and its 100ns glitch rejection prevents spurious triggering from noise.

Does PT7M6837HD0TBEX support level-shifting for reset signaling?

Yes - its open-drain RESET output allows connection to a pull-up resistor tied to any voltage between 0V and 6V, enabling reset signaling across different supply domains (e.g., 1.2V core to 3.3V I/O). The output sinks ≥80μA at ≤0.15V, ensuring clean low-state drive regardless of pull-up voltage.

How does the 70μs timeout affect system reliability?

The 70μs timeout provides the fastest possible reset hold time in the PT7M6832–6840 family, minimizing system downtime during brief supply disturbances while still rejecting sub-microsecond noise spikes. This balance ensures deterministic recovery from voltage sags without compromising responsiveness - critical for real-time control loops and high-frequency sensor sampling.