Analog Devices Inc./Maxim Integrated MAX7381AXR116+

Overview

MAX7381AXR116+ from Maxim Integrated is a factory-trimmed 11MHz silicon oscillator designed as a robust, low-cost replacement for ceramic resonators and crystal oscillators in microcontroller and UART clocking applications across 2.7V–5.5V systems. It delivers a rail-to-rail, 50% duty-cycle square-wave output with ±2% initial frequency accuracy, 5µs startup time, and ±100ppm/°C temperature drift - optimized for white goods, automotive control modules, and industrial appliances operating from −40°C to +125°C.

For engineers reviewing the MAX7381AXR116+ datasheet, MAX7381AXR116+ pinout, MAX7381AXR116+ application, or MAX7381AXR116+ equivalent, key selection criteria include its SC70-3 package compatibility, vibration/EMI immunity, no-PLL architecture, 180ps_P-P jitter at 16MHz (scalable), and absence of external load capacitors or bias components.

Technical Context

The MAX7381AXR116+ implements a fully integrated BiCMOS oscillator core with push-pull CMOS output stage, eliminating reliance on external crystals or resonators and avoiding high-impedance nodes that cause EMI susceptibility. Its frequency is factory-trimmed and fixed at 11MHz - not programmable or adjustable - and operates without phase-locked loop circuitry.

It drives loads up to 1kΩ to ground or 500Ω to V+, sustains stable output across 2.7V–5.5V supply range, and achieves 5ns rise/fall times with 40%–60% duty cycle over full temperature and voltage ranges. Startup occurs within 5µs after V+ exceeds ~1.65V, requiring no external enable sequencing beyond standard power-on reset coordination.

Key Specifications

Pinout & Package

The MAX7381AXR116+ is housed in a space-saving 3-pin SC70-3 package (JEDEC MO-203AA), with exposed pad omitted. Pin 1 is V+, Pin 2 is CLOCK output, and Pin 3 is GND - compatible with standard SC70 pick-and-place tooling and reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SiT1533AI-H4-33E-11.000000 and ABM3B-11.000MHZ-D2Y-T, the MAX7381AXR116+ offers best-in-class EMI/vibration resilience and simplest integration (no external components), trading off some accuracy and jitter for ruggedness and broad supply compatibility.

Availability

MAX7381AXR116+ is available at Aetrix Electronics and suitable for automotive body control modules, smart appliance MCUs, and industrial HVAC controllers requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.

Supply support for MAX7381AXR116+ 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 - emphasizing reliability, integration, and performance under harsh conditions.

The MAX7381AXR116+ belongs to Maxim's silicon oscillator product line, engineered to replace fragile quartz and ceramic timing elements in environments where mechanical stress, temperature extremes, or electromagnetic noise compromise traditional resonator-based clocks.

FAQ

What is the exact output frequency tolerance of the MAX7381AXR116+ over temperature?

The MAX7381AXR116+ has an initial frequency accuracy of ±2% at +25°C and a temperature coefficient of ±100ppm/°C over −40°C to +125°C. This results in a total frequency deviation of approximately ±0.3% across the full operating range - confirmed by design characterization, not production-tested per unit. The MAX7381AXR116+ does not include auto-calibration or trimming circuits.

Can the MAX7381AXR116+ drive a 50pF capacitive load without signal degradation?

Yes - the MAX7381AXR116+ push-pull output maintains 5ns rise/fall times and stable 40%–60% duty cycle into 50pF loads, as verified in typical operating characteristics (Figure MAX7381 toc10). For loads >50pF, Maxim recommends increasing the V+/GND bypass capacitor to ≥1000× the load capacitance to preserve edge integrity and startup behavior.

Is the MAX7381AXR116+ pin-compatible with other MAX7381 variants like MAX7381AXR126+?

Yes - all MAX7381 variants including MAX7381AXR116+ use identical SC70-3 packaging and pinout (V+, CLOCK, GND). Frequency is the sole differentiating parameter; no changes to PCB layout, decoupling, or interface circuitry are required when substituting between 10MHz, 11MHz, 12MHz, 14MHz, or 16MHz versions.

Does the MAX7381AXR116+ require external load capacitors like quartz crystals do?

No - the MAX7381AXR116+ is a fully integrated oscillator with no requirement for external load capacitors, feedback resistors, or crystal mounting. It operates as a drop-in replacement for crystal-based clock circuits: simply remove the crystal and associated caps, then connect V+, GND, and CLOCK to the MCU clock input.

What is the maximum supply current draw of the MAX7381AXR116+ at 5V and +125°C?

At V+ = 5.0V and TA = +125°C, the MAX7381AXR116+ draws ≤6.5mA supply current - consistent with the MAX7381AXR166 specification in the Electrical Characteristics table, as all variants share the same BiCMOS oscillator core and output driver architecture. Current scales linearly with frequency and supply voltage.