Analog Devices Inc./Maxim Integrated MAX7375AXR345-T

Overview

MAX7375AXR345-T from Maxim Integrated is a factory-trimmed 3.45MHz silicon oscillator in SC70-3 package, designed as a vibration- and EMI-resistant clock source for microcontrollers and UARTs in 2.7V–5.5V systems. It delivers rail-to-rail 50% duty cycle square-wave output with ±2% initial accuracy, ±50ppm/°C temp drift, and 5µs startup time-enabling reliable timing in automotive control modules and white-goods MCU subsystems.

For engineers reviewing the MAX7375AXR345-T datasheet, MAX7375AXR345-T pinout, MAX7375AXR345-T application, or MAX7375AXR345-T equivalent, key selection criteria include factory-set frequency stability across -40°C to +125°C, no external load capacitors required, push-pull CMOS output drive capability up to ±10mA, and immunity to mechanical shock in harsh industrial environments.

Technical Context

The MAX7375AXR345-T uses a direct analog oscillator architecture-no PLL or external timing components-generating its 3.45MHz output via internal BiCMOS circuitry. Its push-pull output stage drives 1kΩ to ground or 500Ω to V+ within 300mV of rails, ensuring robust logic-level compatibility with µC clock inputs without impedance matching.

Startup occurs within 5µs after V+ exceeds 1.65V, and output remains stable during power-on/off transitions. Jitter is specified at 160ps_P-P (measured at 8MHz); extrapolated to ~320ps_P-P at 3.45MHz per datasheet scaling, with rise/fall times of 5ns/2.5ns enabling low-EMI operation in noise-sensitive applications.

Key Specifications

Pinout & Package

MAX7375AXR345-T is housed in a 3-pin SC70-3 surface-mount package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained PCB layouts in appliance control boards and automotive body electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SiT1533AI-H4-33E-3.450000G and ABM3B-3.450MHZ-D2Y-T, the MAX7375AXR345-T offers balanced performance: better EMI/vibration immunity than ceramic, lower cost and simpler layout than MEMS, and proven operation across -40°C to +125°C without derating.

Availability

MAX7375AXR345-T is available at Aetrix Electronics and suitable for automotive body electronics, smart appliance control systems, and portable medical devices requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX7375AXR345-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 power-management ICs for industrial, automotive, and computing applications.

The MAX7375AXR345-T belongs to Maxim's silicon oscillator product line, engineered to replace quartz and ceramic timing elements with monolithic, robust, and easy-to-integrate clock sources for cost-sensitive, high-reliability embedded systems.

FAQ

What is the exact factory-trimmed frequency of the MAX7375AXR345-T?

The MAX7375AXR345-T is factory-trimmed to 3.45MHz, as indicated by the "345" suffix in the part number. This frequency is set during wafer-level testing and does not require external adjustment or calibration. The device maintains this nominal output across its full 2.7V–5.5V supply range and -40°C to +125°C temperature range, with ±2% initial accuracy and ±50ppm/°C temperature coefficient.

Does the MAX7375AXR345-T require external load capacitors or biasing components?

No, the MAX7375AXR345-T requires no external components. Its fully integrated oscillator architecture eliminates the need for load capacitors, feedback resistors, or crystal-matching networks. When retrofitting into a design previously using a ceramic resonator or crystal, all external timing components must be removed-only V+, GND, and the CLOCK output connection are needed.

What is the maximum capacitive load the MAX7375AXR345-T can drive reliably?

The MAX7375AXR345-T is characterized with CL = 10pF, 50pF, and 100pF loads in the datasheet, showing stable waveform integrity. Its ±10mA push-pull output can drive typical MCU clock inputs (typically <10pF) without degradation. For heavier loads, a bypass capacitor ≥1000× the output load capacitance is recommended-e.g., ≥100nF for a 100pF trace load-to maintain power-supply rejection and signal edge fidelity.

How does the MAX7375AXR345-T perform in high-vibration environments like automotive under-hood applications?

The MAX7375AXR345-T is highly resistant to vibration due to its monolithic silicon construction-unlike quartz crystals or ceramic resonators, it has no mechanical resonant structure susceptible to shock or acceleration-induced frequency shifts. This makes it suitable for automotive body control modules, engine control interfaces, and other applications where mechanical stress would degrade traditional timing devices.

Is the MAX7375AXR345-T pin-compatible with other variants in the MAX7375 family?

Yes, all MAX7375 variants-including MAX7375AXR345-T-share identical SC70-3 pinout (V+, CLOCK, GND) and electrical interface. Frequency differentiation is purely internal; no changes to PCB layout, firmware, or external circuitry are required when substituting between standard-frequency versions such as MAX7375AXR365-T (3.58MHz) or MAX7375AXR405-T (4.00MHz).