Analog Devices Inc./Maxim Integrated MAX7375AXR185+T

Overview

MAX7375AXR185+T from Maxim Integrated is a factory-trimmed 1.84MHz silicon oscillator in SC70-3 package, delivering rail-to-rail 50% duty cycle square-wave output for microcontroller and UART clocking in 2.7V–5.5V systems. It features ±2% initial accuracy, ±50ppm/°C temp drift, 5µs startup time, 160ps_P-P jitter at 8MHz (scaled), and ±10mA drive capability - enabling direct replacement of ceramic resonators and crystals in white goods and appliance control boards.

For engineers reviewing the MAX7375AXR185+T datasheet, MAX7375AXR185+T pinout, MAX7375AXR185+T application, or MAX7375AXR185+T equivalent, key selection criteria include factory-set 1.84MHz frequency, SC70-3 footprint compatibility, -40°C to +125°C operation, no external components required, and immunity to vibration/EMI in humid environments.

Technical Context

The MAX7375AXR185+T uses a fully integrated BiCMOS oscillator core with no PLL-frequency is fixed at 1.84MHz via factory trimming. Its push-pull CMOS output drives 1kΩ to ground or 500Ω to V+, eliminating impedance-matching concerns when interfacing with µC clock inputs.

It operates across 2.7V–5.5V supply range with supply current of 0.8mA (typ) to 1.25mA (max) at +25°C, and maintains stable duty cycle (45–57%) and low jitter over temperature and voltage variations-critical for timing-critical embedded control loops in home appliances.

Key Specifications

Pinout & Package

Package: SC70-3 (3-pin surface-mount, 1.25mm × 0.85mm × 0.55mm body, 0.65mm pitch). RoHS-compliant, tape-and-reel packaging only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar silicon oscillator applications.

Compared with SiT1533AI-H4-33E-1.840000D and ABM3B-1.840MHZ-D2Y-T, the MAX7375AXR185+T offers broader supply range (2.7–5.5V), superior vibration/EMI resilience, and simpler integration-making it optimal for ruggedized 3V/5V appliance control designs where robustness outweighs ultra-fine frequency tolerance.

Availability

MAX7375AXR185+T is available at Aetrix Electronics and suitable for white goods timing modules, microcontroller clock sources, and UART timing references requiring stable component supply, extended temperature operation, and drop-in replacement of ceramic resonators.

Supply support for MAX7375AXR185+T 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and timing solutions for industrial, automotive, and computing applications-with emphasis on high-reliability, low-power, and small-footprint ICs.

The MAX7375 series was developed specifically to replace quartz and ceramic timing elements in cost-sensitive, high-volume embedded systems-delivering robustness, simplicity, and factory-trimmed accuracy in SC70 packaging.

FAQ

What is the exact factory-trimmed frequency of MAX7375AXR185+T?

The MAX7375AXR185+T is factory-trimmed to 1.84MHz with ±2% initial accuracy at +25°C and V+ = 3.0V. This frequency is fixed and non-adjustable-no external components or programming are required. The top mark "AOU" on the SC70-3 package confirms this specific variant. Frequency remains stable across 2.7V–5.5V supply and -40°C to +125°C operating range, with ±50ppm/°C temperature coefficient.

Does MAX7375AXR185+T require external load capacitors or biasing resistors?

No, the MAX7375AXR185+T requires no external components. It integrates all oscillator circuitry-including frequency-setting elements-within the BiCMOS die. Unlike quartz crystals or ceramic resonators, it does not need load capacitors, feedback resistors, or gain-setting networks. This eliminates layout sensitivity and reduces BOM count, making MAX7375AXR185+T ideal for retrofitting existing crystal-based designs with minimal PCB changes.

What is the startup time specification for MAX7375AXR185+T, and how does it affect system reset timing?

The MAX7375AXR185+T achieves stable oscillation within 5µs after V+ rises above 2.7V. This fast startup enables tight synchronization with power-on reset circuits-engineers should assert system reset until at least 5µs after V+ exceeds 2.7V. The short delay supports rapid wake-up in battery-powered appliances and ensures deterministic µC boot timing without waiting for crystal ring-up delays that exceed milliseconds.

Can MAX7375AXR185+T operate at 5V supply, and what are its output voltage levels at that rail?

Yes, MAX7375AXR185+T operates across 2.7V–5.5V, including full 5V operation. At V+ = 5V and ISOURCE = 9mA, VOH ≥ 4.6V; at ISINK = 20mA, VOL ≤ 0.4V. This rail-to-rail CMOS-compatible swing ensures reliable logic-level recognition by 5V µCs and peripherals-no level-shifting required. The push-pull output structure maintains these levels across temperature and load variations.

How does MAX7375AXR185+T compare to quartz crystals in terms of EMI and vibration resistance?

Unlike quartz crystals-which rely on piezoelectric resonance and exhibit high impedance nodes vulnerable to EMI and mechanical shock-the MAX7375AXR185+T uses a monolithic silicon oscillator with no high-impedance nodes. Its solid-state design provides inherent immunity to board vibration, acoustic noise, and electromagnetic interference. This makes MAX7375AXR185+T significantly more reliable than crystals in washing machines, HVAC blowers, or industrial motor controls where mechanical stress degrades crystal performance.