Diodes Incorporated PT7M6243CLTA3EX

Overview

PT7M6243CLTA3EX from Diodes Incorporated is a precision N-channel open-drain voltage detector with 4.3V threshold (VTH+), ±1.5% accuracy at 25°C, 1.0μA supply current at 3.6V, and 20μs propagation delay on VCC rise. It monitors power rails in battery-powered microcontrollers and portable electronics to trigger reset or warning signals when supply drops below 4.1V (VTH− = VTH+ / 1.045).

For engineers reviewing the PT7M6243CLTA3EX datasheet, PT7M6243CLTA3EX pinout, PT7M6243CLTA3EX application, or PT7M6243CLTA3EX equivalent, key selection criteria include threshold tolerance over temperature, open-drain output drive capability, ultra-low ICC, SOT23-3 package footprint, and hysteresis-enabled noise immunity in noisy supply environments.

Technical Context

The PT7M6243CLTA3EX integrates a trimmed bandgap reference, comparator, and internal resistor network to deliver fixed 4.3V detection with 5% hysteresis (VTH+ = 1.05 × VTH−). Its operation relies on precise internal voltage division rather than external components, enabling single-supply monitoring without calibration.

It asserts active-low RST when VCC falls below VTH− (≈4.1V) and releases RST when VCC rises above VTH+ (4.3V). The N-channel open-drain output supports flexible pull-up configurations up to 5.5V and sinks ≥1mA at VOL ≤ 0.3V, compatible with 1.8V–5V logic systems.

Key Specifications

Pinout & Package

PT7M6243CLTA3EX uses the TA3 (SOT23-3) package: 1.45mm × 2.9mm body, 0.95mm height, gull-wing leads, JEDEC MO-178AA compliant. Pin 1 = VCC, Pin 2 = GND, Pin 3 = RST (open-drain output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S-43SA-7 and TPS3808G33DBVR, PT7M6243CLTA3EX offers superior initial accuracy (±1.5%) and open-drain flexibility at the cost of requiring an external pull-up-ideal for designs reusing existing reset bus topologies.

Availability

PT7M6243CLTA3EX is available at Aetrix Electronics and suitable for microcontroller reset supervision, Li-ion battery protection, and USB peripheral power sequencing requiring stable component supply across industrial and consumer production programs.

Supply support for PT7M6243CLTA3EX 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.

The PT7M62xx series was designed specifically for ultra-low-power voltage monitoring in space-constrained, battery-operated systems where precision, long service life, and minimal external components are critical.

FAQ

What is the exact VTH− voltage for PT7M6243CLTA3EX?

VTH− is calculated as VTH+ divided by 1.045, resulting in 4.3V ÷ 1.045 ≈ 4.115V. This value defines the release point where RST de-asserts as VCC rises, providing 5% hysteresis to prevent false triggering during supply ripple.

Can PT7M6243CLTA3EX operate from a 1.8V supply?

Yes. Its operating voltage range is 1.2V to 5.5V, and it maintains full specification compliance-including 4.3V threshold accuracy and 1.0μA ICC-at 1.8V. Output sink capability remains ≥1mA with VOL ≤ 0.3V at this voltage.

Is an external capacitor required on the RST pin?

No. The RST pin is an open-drain output and does not require a capacitor. However, a pull-up resistor (1kΩ–510kΩ) is mandatory to define the high-state voltage level and ensure proper logic interfacing with downstream devices.

How does the 20μs propagation delay affect system reset timing?

The 20μs delay applies only to VCC rising-edge detection and ensures RST remains asserted until VCC stabilizes above VTH+. It does not add latency to undervoltage detection-RST asserts immediately upon VCC falling below VTH−, enabling rapid fault response.