ECS-40-20-1 ECS Crystal or Oscillator (Other) In Stock
ECS ECS-40-20-1 is a 4.0000 MHz through-hole quartz crystal with 20 pF load capacitance, providing a stable reference frequency for microcontroller and digital timing circuits. It is housed in a standard HC-49/U through-hole metal package suitable for hand or wave soldering. Widely used in embedded systems, UART clock generation, and real-time clock applications requiring a precise 4 MHz reference.
- Manufacturer
- ECS
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- ECS-40-20-1 Datasheet PDF
- Category
- Crystal or Oscillator
- Price
- From $0.2520(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of ECS-40-20-1?
- 4.0000 MHz fundamental-mode quartz crystal with 20 pF load capacitance for precision timing in microcontroller clock circuits
- HC-49/U through-hole metal package offering robust mechanical support and easy hand-soldering during prototype and production board assembly
- Stable low-frequency reference suitable for UART baud rate generation, RTC circuits, and 8-bit microcontroller system clocks
What is ECS-40-20-1 used for?
The ECS-40-20-1 provides the 4 MHz clock reference used in 8-bit microcontroller designs such as PIC, AVR, and 8051-based systems where precise UART baud rate timing, timer accuracy, and instruction cycle consistency depend on a stable crystal oscillator. It is also applied in real-time clock circuits, industrial sensor interfaces, and low-speed communication modules where a 4.0000 MHz through-hole crystal offers a cost-effective and reliable frequency source.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the ECS-40-20-1 datasheet?
ECS-40-20-1 Datasheet DownloadOfficial datasheet from ECS
What are equivalent replacements for ECS-40-20-1?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What load capacitance is specified for the ECS-40-20-1 and why does it matter for oscillator circuit design?
The ECS-40-20-1 is specified with a 20 pF load capacitance, which must be matched by the oscillator circuit's external capacitors to achieve the correct 4.0000 MHz operating frequency. Using capacitors that deviate significantly from 20 pF will shift the crystal's series resonant frequency, causing timing errors in microcontroller UART baud rates, timer counts, and instruction cycles that depend on an accurate 4 MHz reference.
Which microcontroller families commonly use a 4.0000 MHz crystal like the ECS-40-20-1 as their system clock source?
The ECS-40-20-1 is commonly used with 8-bit microcontroller families including PIC (PIC16, PIC18), Atmel AVR (ATmega, ATtiny), and Intel 8051 derivatives that support 4 MHz fundamental-mode crystals with 20 pF load capacitance. At 4 MHz, these microcontrollers execute instructions at rates of 1 MIPS to 4 MIPS depending on the pipeline architecture, making it a standard clock choice for low-power and cost-sensitive embedded control applications.
When is the through-hole HC-49/U package of the ECS-40-20-1 preferred over SMD crystal alternatives in production?
The through-hole HC-49/U package of the ECS-40-20-1 is preferred during prototyping and in low-volume production runs where hand soldering is practical, since it seats securely in a PCB hole without the reflow oven requirements of SMD crystals. It also offers greater mechanical robustness against board flexing and vibration compared to small SMD packages such as the 3.2 mm x 2.5 mm or 5.0 mm x 3.2 mm SMD footprints, making it suitable for industrial and rugged application boards where PCB mechanical stress is a concern.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About ECS
ECS is a leading electronic component manufacturer. FindMyChip sources ECS ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.5400 | $0.54 |
| 45+ | $0.3600 | $16.20 |
| 168+ | $0.2520 | $42.34 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Response time is incredible — usually under 4 hours. They understand that production lines can't wait.”
You May Also Like
VG-4231CA 25.0000M-FGRC3
Epson Timing
Crystal or Oscillator
CX2016DB16000D0WZRC1
AVX
Crystal or Oscillator
ABS25-32.768KHZ-6-1-T
ABRACON
Crystal or Oscillator
ABS06-32.768KHZ-T
ABRACON
Crystal or Oscillator
ASTXR-12-38.400MHZ-514054-T
ABRACON
Crystal or Oscillator
SG-210STF 50.0000MS3
Epson Timing
Crystal or Oscillator
HCM4910000000ABJT
Citizen Finetech Miyota
Crystal or Oscillator
HCM4920000000ABJT
Citizen Finetech Miyota
Crystal or Oscillator
7A-25.000MAAJ-T
TXC
Crystal or Oscillator
ABM3-16.000MHZ-B4Y-T
ABRACON
Crystal or Oscillator
XRCGB27M120F3M10R0
Murata Electronics
Crystal or Oscillator
ABS25-32.000KHZ-T
ABRACON
Crystal or Oscillator
AIAC-1812-68NJ-T
ABRACON
Crystal or Oscillator
QC5CA8.00000F12B23M
QANTEK TECHNOLOGY CORPORATION
Crystal or Oscillator
CX2016DB20000D0FLJCC
AVX
Crystal or Oscillator
AB-557-03-HCHC-F-L-C-T
ABRACON
Crystal or Oscillator
CB3-3C-80M0000
CTS
Crystal or Oscillator
ABLS2-6.000MHZ-D4Y-T
ABRACON
Crystal or Oscillator
ABMM-14.31818MHZ-B2-T
ABRACON
Crystal or Oscillator
ABMM-12.000MHZ-B2-T
ABRACON
Crystal or Oscillator
FA-238 25.0000MB-K3
Epson Timing
Crystal or Oscillator
FA-238 16.0000MB-C3
Epson Timing
Crystal or Oscillator
FA-238 25.0000MB-C3
Epson Timing
Crystal or Oscillator
ASTMHTA-8.000MHZ-AJ-E
ABRACON
Crystal or Oscillator