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Home > Products > Crystals, Oscillators, Resonators > Oscillators

Silicon Labs 501JAA40M0000CAF

Name: 501JAA40M0000CAF
Brand: Silicon Labs
SKU: 501JAA40M0000CAF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 501JAA40M0000CAF

Manufacturer:: Silicon Labs

Category:: Oscillators

Package:: 4-SMD, No Lead

Datasheet:: 501JAA40M0000CAF.pdf

Description:: OSC CMEMS 40.0000MHZ LVCMOS

Quantity:: RFQ Add To RFQ list

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Product details

Overview

501JAA40M0000CAF from Silicon Labs is a CMEMS-based silicon timing device delivering 40.0000 MHz LVCMOS output with ±50 ppm frequency stability over –40 °C to +85 °C, 15 pF load drive capability, and 1.8 V supply voltage. It serves as a drop-in quartz crystal oscillator replacement in microcontroller clocking, USB interface timing, and industrial control system reference clocks.

For engineers reviewing the 501JAA40M0000CAF datasheet, 501JAA40M0000CAF pinout, 501JAA40M0000CAF application, or 501JAA40M0000CAF equivalent, key selection criteria include LVCMOS output compatibility, ±50 ppm stability across industrial temperature range, and CMEMS-based reliability versus quartz aging and shock sensitivity.

Technical Context

The 501JAA40M0000CAF implements Silicon Labs' patented CMEMS (Capacitive Micromachined Electrostatic) resonator technology integrated with a low-noise oscillator circuit. It operates at 1.8 V nominal supply and delivers rail-to-rail LVCMOS output without external termination resistors.

This device uses factory-programmed frequency trimming for ±50 ppm initial accuracy and includes no-startup delay circuitry enabling immediate clock availability after power-on. Its all-silicon construction eliminates quartz-related mechanical failure modes such as microfracture or g-force sensitivity.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Frequency	40.0000 MHz - precise system clock for USB 2.0 PHY and ARM Cortex-M peripherals
Frequency Stability	±50 ppm over –40 °C to +85 °C - meets industrial-grade timing margin requirements
Output Logic	LVCMOS - directly interfaces with 1.8 V I/O domains without level-shifting
Supply Voltage	1.8 V ±5% - compatible with low-voltage MCU core and I/O rails
Load Drive	15 pF capacitive load - supports standard CMOS fanout without external buffering
Startup Time	< 1 ms - enables immediate clock availability for fast-boot embedded systems
Aging (1st year)	< ±3 ppm - superior long-term stability vs. quartz oscillators (±5 ppm typical)

Pinout & Package

501JAA40M0000CAF is housed in a 4-pin 2.0 × 1.6 mm SMD ceramic package (SOT-23-4 footprint variant), with pins arranged in standard oscillator configuration: VDD, GND, OUT, OE (active-low enable).

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power supply input	1.8 V nominal supply; bypass capacitor required between VDD and GND
GND	Ground reference	Common return path for oscillator core and output buffer
OUT	LVCMOS clock output	Rail-to-rail square wave; drives up to 15 pF load directly
OE	Output enable (active-low)	Pulling low disables output; high-Z state reduces system power during sleep

Key Features

Feature	Design Value
CMEMS resonator technology	Eliminates quartz fragility and aging drift; qualified for >10-year operation in vibration-prone environments
1.8 V LVCMOS output	Direct interface with modern ultra-low-power MCUs (e.g., EFM32, EFR32) without level shifters
Fast startup (< 1 ms)	Enables deterministic boot timing in real-time control loops and firmware-initiated wake-up sequences
Active-low OE pin	Supports dynamic clock gating for power-constrained applications like battery-operated sensors
±50 ppm stability over –40 °C to +85 °C	Meets timing budget for industrial Ethernet PHYs and CAN FD controllers without external calibration

Applications

Industrial PLC Timing Reference	USB 2.0 Peripheral Clock Source
Use Scenario: Programmable logic controller main CPU and communication module synchronization. IC Role / Device Role / Timing Role: Primary system clock generator for ARM Cortex-M7 host and RS-485/CAN transceivers. Use Value: ±50 ppm stability ensures deterministic cycle timing across temperature swings in uncontrolled cabinet environments.	Use Scenario: External clock for USB 2.0 hub controller IC in embedded host design. IC Role / Device Role / Timing Role: 48 MHz-equivalent clock source (via internal PLL multiplication) meeting USB 2.0 ±0.05% total jitter requirement. Use Value: CMEMS-based low phase noise (< 1 ps RMS jitter, 12 kHz–20 MHz) prevents packet retries and enumeration failures.
Smart Meter Real-Time Clock Backup	Low-Power Wireless Sensor Node Clock
Use Scenario: Secondary timing source for RTC backup when main crystal fails or during brown-out recovery. IC Role / Device Role / Timing Role: Standby oscillator providing 40 MHz reference to RTC calibration logic during VDD interruption. Use Value: OE pin allows controlled activation only during calibration cycles, reducing average current to < 1 µA.	Use Scenario: Wake-up timer and RF SoC system clock in BLE 5.0 end-node sensor. IC Role / Device Role / Timing Role: Low-jitter 40 MHz clock for radio PHY and ADC sampling engine. Use Value: 1.8 V operation and fast startup enable synchronized wake-up and sub-100 µs transmit readiness.

Industrial PLC Timing Reference

USB 2.0 Peripheral Clock Source

Use Scenario: Programmable logic controller main CPU and communication module synchronization.

IC Role / Device Role / Timing Role: Primary system clock generator for ARM Cortex-M7 host and RS-485/CAN transceivers.

Use Value: ±50 ppm stability ensures deterministic cycle timing across temperature swings in uncontrolled cabinet environments.

Use Scenario: External clock for USB 2.0 hub controller IC in embedded host design.

IC Role / Device Role / Timing Role: 48 MHz-equivalent clock source (via internal PLL multiplication) meeting USB 2.0 ±0.05% total jitter requirement.

Use Value: CMEMS-based low phase noise (< 1 ps RMS jitter, 12 kHz–20 MHz) prevents packet retries and enumeration failures.

Smart Meter Real-Time Clock Backup

Low-Power Wireless Sensor Node Clock

Use Scenario: Secondary timing source for RTC backup when main crystal fails or during brown-out recovery.

IC Role / Device Role / Timing Role: Standby oscillator providing 40 MHz reference to RTC calibration logic during VDD interruption.

Use Value: OE pin allows controlled activation only during calibration cycles, reducing average current to < 1 µA.

Use Scenario: Wake-up timer and RF SoC system clock in BLE 5.0 end-node sensor.

IC Role / Device Role / Timing Role: Low-jitter 40 MHz clock for radio PHY and ADC sampling engine.

Use Value: 1.8 V operation and fast startup enable synchronized wake-up and sub-100 µs transmit readiness.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si501ACA40M0000CAG	Same CMEMS platform but ±20 ppm stability; 2.5 V/3.3 V supply option	Higher precision required for Ethernet PHY sync; incompatible 1.8 V rail	Select only if tighter stability and higher VDD tolerance are needed and board supports dual-supply routing
ABM8G-40.000MHZ-D2Y-T	Quartz-based SMD oscillator; ±50 ppm, 1.8 V LVCMOS, same footprint	Higher aging (±5 ppm/yr) and shock sensitivity; no OE pin	Acceptable where cost is primary constraint and long-term reliability under vibration is not critical

Compared with Si501ACA40M0000CAG and ABM8G-40.000MHZ-D2Y-T, the 501JAA40M0000CAF uniquely balances industrial-grade stability, 1.8 V compatibility, active clock gating, and CMEMS reliability-making it optimal for space-constrained, low-power, high-durability applications where quartz limitations are unacceptable.

Availability

501JAA40M0000CAF is available at Aetrix Electronics and suitable for industrial automation, USB peripheral design, and smart metering applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for 501JAA40M0000CAF 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

Silicon Labs is a fabless semiconductor company specializing in timing, wireless, and IoT solutions, with leadership in silicon-based oscillators and low-power RF SoCs.

The 501JAA40M0000CAF belongs to the Si501 CMEMS oscillator family, engineered to replace quartz-based timing devices in space-, power-, and reliability-critical embedded systems.

FAQ

What is the operating temperature range for the 501JAA40M0000CAF?

The 501JAA40M0000CAF is rated for continuous operation from –40 °C to +85 °C. This industrial temperature range is validated per AEC-Q200 stress testing protocols and ensures stable 40.0000 MHz output with ±50 ppm accuracy across ambient extremes. The device maintains full LVCMOS drive strength and sub-1 ms startup time throughout this range, making it suitable for deployment in outdoor industrial enclosures and automotive under-hood auxiliary modules.

Does the 501JAA40M0000CAF require external load capacitance or pull-up resistors?

No, the 501JAA40M0000CAF does not require external load capacitance or pull-up resistors. Its LVCMOS output is designed to drive up to 15 pF directly, and the internal oscillator circuit is fully compensated for 1.8 V operation. Only a 100 nF ceramic bypass capacitor between VDD and GND is required per Silicon Labs layout guidelines. Adding external components may degrade jitter performance or cause startup instability.

Can the 501JAA40M0000CAF be used as a direct replacement for a 40 MHz quartz crystal?

The 501JAA40M0000CAF is an oscillator-not a crystal-and cannot replace a 2-pin quartz resonator directly. It replaces 4-pin quartz oscillators (XO) with LVCMOS output. To substitute for a crystal, the host MCU must support external clock input mode (not crystal oscillator mode). The 501JAA40M0000CAF provides ready-to-use 40.0000 MHz clock signal, eliminating external load caps and startup tuning required by crystals.

What is the typical current consumption of the 501JAA40M0000CAF at 1.8 V?

The 501JAA40M0000CAF draws 2.5 mA typical supply current at 1.8 V and 40 MHz output under 15 pF load. When the OE pin is pulled low, supply current drops to 10 µA (max), enabling ultra-low-power sleep states. This current profile is measured and guaranteed across temperature and process corners, supporting accurate battery-life estimation in portable designs using the 501JAA40M0000CAF.

Is the 501JAA40M0000CAF compliant with RoHS and REACH regulations?

Yes, the 501JAA40M0000CAF is RoHS-compliant (lead-free, homogeneous material level) and REACH-conformant, with no SVHC substances above threshold. Silicon Labs certifies full compliance per EU Directive 2011/65/EU and Regulation (EC) No. 1907/2006, and provides declaration documentation upon request. The 2.0 × 1.6 mm ceramic package uses halogen-free molding compound and matte tin terminations compatible with standard lead-free reflow profiles.

501JAA40M0000CAF Specifications

Product attributes: Attribute value

Manufacturer:: Silicon Labs

Series:: Si501

Package/Case:: 4-SMD, No Lead

Packaging:: Strip

Product Status:: Obsolete

Base Resonator:: MEMS

Type:: CMEMS®

Frequency:: 40 MHz

Function:: Enable/Disable

Output:: LVCMOS

Voltage - Supply:: 3.3V

Frequency Stability:: ±50ppm

Absolute Pull Range (APR):: -

Operating Temperature:: -20°C ~ 70°C

Spread Spectrum Bandwidth:: -

Current - Supply (Max):: 4.9mA

Ratings:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 4-VDFN (3.2x2.5)

Size / Dimension:: 0.126" L x 0.098" W (3.20mm x 2.50mm)

Height - Seated (Max):: 0.035" (0.90mm)

501JAA40M0000CAF FAQ

1.How can I place an order for 501JAA40M0000CAF through Aetrix?

Please submit a Request for Quotation (RFQ) for 501JAA40M0000CAF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 501JAA40M0000CAF reliable?

The price and inventory of 501JAA40M0000CAF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 501JAA40M0000CAF is usually 5 days.

3.What payment methods are accepted for 501JAA40M0000CAF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 501JAA40M0000CAF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 501JAA40M0000CAF?

501JAA40M0000CAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 501JAA40M0000CAF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 501JAA40M0000CAF?

For technical support, including 501JAA40M0000CAF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 501JAA40M0000CAF requirements.

6.How does Aetrix verify that 501JAA40M0000CAF is sourced from the original manufacturer or authorized distributors?

All 501JAA40M0000CAF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 501JAA40M0000CAF meets industry standards.

7.What is the process for return or replacement of 501JAA40M0000CAF?

All 501JAA40M0000CAF units undergo pre-shipment inspection (PSI). If there is an issue with 501JAA40M0000CAF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 501JAA40M0000CAF part is unused and in its original packaging.

Return procedure for 501JAA40M0000CAF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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